package store

import (
	"context"
	"database/sql"
	"encoding/json"
	"errors"
	"fmt"
	"sort"
	"strings"
	"time"
)

var councilReviewerRoles = []string{
	"architecture-reviewer",
	"implementation-reviewer",
	"risk-reviewer",
}

type CouncilRun struct {
	RunID         string `json:"run_id"`
	Mode          string `json:"mode"`
	TargetType    string `json:"target_type"`
	OutputMode    string `json:"output_mode"`
	OnlyUnanimous bool   `json:"only_unanimous"`
}

type CouncilInput struct {
	RunID        string `json:"run_id"`
	Prompt       string `json:"prompt,omitempty"`
	TargetFile   string `json:"target_file,omitempty"`
	RepoPath     string `json:"repo_path,omitempty"`
	TargetTaskID string `json:"task_id,omitempty"`
}

type CouncilReviewer struct {
	ReviewerRole string `json:"reviewer_role"`
	TaskID       string `json:"task_id"`
	Status       string `json:"status"`
}

type CouncilStartInput struct {
	RunID         string
	Target        string
	TargetFile    string
	RepoPath      string
	TargetTaskID  string
	TargetType    string
	Mode          string
	OutputMode    string
	OnlyUnanimous bool
}

type CouncilStartResult struct {
	Run       CouncilRun        `json:"run"`
	Input     CouncilInput      `json:"input"`
	Reviewers []CouncilReviewer `json:"reviewers"`
}

type CouncilWaitInput struct {
	RunID   string
	Timeout time.Duration
}

type CouncilWaitResult struct {
	Woke             bool              `json:"woke"`
	RunID            string            `json:"run_id"`
	AllComplete      bool              `json:"all_complete"`
	ReviewerStatuses []CouncilReviewer `json:"reviewers"`
}

type CouncilFinding struct {
	RunID          string          `json:"run_id"`
	ReviewerRole   string          `json:"reviewer_role"`
	FindingID      string          `json:"finding_id"`
	Title          string          `json:"title"`
	Summary        string          `json:"summary"`
	Proposal       string          `json:"proposal"`
	Rationale      string          `json:"rationale"`
	Confidence     string          `json:"confidence"`
	TagsJSON       json.RawMessage `json:"tags_json"`
	TargetRefsJSON json.RawMessage `json:"target_refs_json"`
}

type CouncilGroup struct {
	RunID                string          `json:"run_id"`
	GroupID              string          `json:"group_id"`
	Proposal             string          `json:"proposal"`
	Bucket               string          `json:"bucket"`
	SupportCount         int             `json:"support_count"`
	SupportersJSON       json.RawMessage `json:"supporters_json"`
	DissentersJSON       json.RawMessage `json:"dissenters_json"`
	RationaleSummary     string          `json:"rationale_summary"`
	TagsJSON             json.RawMessage `json:"tags_json"`
	SourceFindingIDsJSON json.RawMessage `json:"source_finding_ids_json"`
}

type CouncilTallyInput struct {
	RunID      string
	Similarity string
}

type CouncilTallyResult struct {
	RunID                  string         `json:"run_id"`
	Similarity             string         `json:"similarity"`
	Counts                 map[string]int `json:"counts"`
	GroupedRecommendations []CouncilGroup `json:"grouped_recommendations"`
}

type CouncilReportInput struct {
	RunID string
	Show  string
}

type CouncilReportArtifact struct {
	Kind string `json:"kind"`
	Path string `json:"path"`
}

type CouncilReportResult struct {
	RunID                  string                  `json:"run_id"`
	Show                   []string                `json:"show"`
	Summary                map[string]int          `json:"summary"`
	GroupedRecommendations []CouncilGroup          `json:"grouped_recommendations"`
	Markdown               string                  `json:"markdown,omitempty"`
	ReportArtifacts        []CouncilReportArtifact `json:"report_artifacts,omitempty"`
}

type CouncilPersistReportInput struct {
	RunID        string
	Show         []string
	Summary      map[string]int
	MarkdownPath string
}

type councilReviewerOutput struct {
	ReviewerRole string                 `json:"reviewer_role"`
	Findings     []councilFindingOutput `json:"findings"`
}

type councilFindingOutput struct {
	Title      string          `json:"title"`
	Summary    string          `json:"summary"`
	Proposal   string          `json:"proposal"`
	Rationale  string          `json:"rationale"`
	Confidence string          `json:"confidence"`
	Tags       json.RawMessage `json:"tags"`
	TargetRefs json.RawMessage `json:"target_refs"`
}

func (s *OrchStore) StartCouncil(ctx context.Context, input CouncilStartInput) (CouncilStartResult, error) {
	runID := strings.TrimSpace(input.RunID)
	if runID == "" {
		return CouncilStartResult{}, fmt.Errorf("%w: run id is required", ErrInvalidInput)
	}

	councilInput, err := normalizeCouncilInput(input)
	if err != nil {
		return CouncilStartResult{}, err
	}

	councilRun, err := normalizeCouncilRun(input)
	if err != nil {
		return CouncilStartResult{}, err
	}

	now := nowUTC()
	tx, err := s.db.BeginTx(ctx, nil)
	if err != nil {
		return CouncilStartResult{}, fmt.Errorf("begin council start transaction: %w", err)
	}
	defer tx.Rollback()

	if _, err := selectRun(ctx, tx, runID); err == nil {
		return CouncilStartResult{}, fmt.Errorf("%w: run %s already exists", ErrInvalidState, runID)
	} else if !errors.Is(err, ErrRunNotFound) {
		return CouncilStartResult{}, err
	}

	goal := buildCouncilRunGoal(councilInput)
	summary := buildCouncilRunSummary(councilRun, councilInput)

	_, err = tx.ExecContext(
		ctx,
		`INSERT INTO runs (run_id, goal, summary, status, created_at, updated_at)
		 VALUES (?, ?, ?, ?, ?, ?)`,
		runID,
		goal,
		summary,
		"active",
		formatTime(now),
		formatTime(now),
	)
	if err != nil {
		return CouncilStartResult{}, fmt.Errorf("insert council run into runs: %w", err)
	}

	if err := insertEvent(ctx, tx, eventInput{
		RunID:       runID,
		Source:      "orch",
		EventType:   "run_initialized",
		Summary:     summary,
		PayloadJSON: marshalJSON(map[string]any{"goal": goal, "summary": summary}),
		CreatedAt:   now,
	}); err != nil {
		return CouncilStartResult{}, err
	}

	_, err = tx.ExecContext(
		ctx,
		`INSERT INTO council_runs (
			run_id, mode, target_type, output_mode, only_unanimous, created_at, updated_at
		) VALUES (?, ?, ?, ?, ?, ?, ?)`,
		runID,
		councilRun.Mode,
		councilRun.TargetType,
		councilRun.OutputMode,
		boolToInt(councilRun.OnlyUnanimous),
		formatTime(now),
		formatTime(now),
	)
	if err != nil {
		return CouncilStartResult{}, fmt.Errorf("insert council run metadata: %w", err)
	}

	_, err = tx.ExecContext(
		ctx,
		`INSERT INTO council_inputs (
			run_id, prompt, target_file, repo_path, target_task_id, created_at, updated_at
		) VALUES (?, ?, ?, ?, ?, ?, ?)`,
		runID,
		councilInput.Prompt,
		councilInput.TargetFile,
		councilInput.RepoPath,
		councilInput.TargetTaskID,
		formatTime(now),
		formatTime(now),
	)
	if err != nil {
		return CouncilStartResult{}, fmt.Errorf("insert council input metadata: %w", err)
	}

	reviewers := make([]CouncilReviewer, 0, len(councilReviewerRoles))
	for i, reviewerRole := range councilReviewerRoles {
		taskID := fmt.Sprintf("CR%d", i+1)
		task := Task{
			RunID:          runID,
			TaskID:         taskID,
			Title:          buildCouncilTaskTitle(reviewerRole),
			Summary:        buildCouncilTaskSummary(reviewerRole),
			Status:         "ready",
			DefaultTo:      reviewerRole,
			Priority:       "normal",
			AcceptanceJSON: []byte(buildCouncilTaskAcceptanceJSON(councilRun, councilInput, reviewerRole)),
			CreatedAt:      now,
			UpdatedAt:      now,
		}

		_, err = tx.ExecContext(
			ctx,
			`INSERT INTO tasks (
				run_id, task_id, title, summary, status, default_to, priority,
				acceptance_json, latest_attempt_no, created_at, updated_at
			) VALUES (?, ?, ?, ?, ?, ?, ?, ?, NULL, ?, ?)`,
			task.RunID,
			task.TaskID,
			task.Title,
			task.Summary,
			task.Status,
			nullIfEmpty(task.DefaultTo),
			task.Priority,
			string(task.AcceptanceJSON),
			formatTime(task.CreatedAt),
			formatTime(task.UpdatedAt),
		)
		if err != nil {
			return CouncilStartResult{}, fmt.Errorf("insert council reviewer task: %w", err)
		}

		if err := insertEvent(ctx, tx, eventInput{
			RunID:       runID,
			TaskID:      taskID,
			Source:      "orch",
			EventType:   "task_added",
			Summary:     task.Title,
			PayloadJSON: marshalJSON(map[string]any{"title": task.Title, "priority": task.Priority}),
			CreatedAt:   now,
		}); err != nil {
			return CouncilStartResult{}, err
		}
		if err := insertEvent(ctx, tx, eventInput{
			RunID:       runID,
			TaskID:      taskID,
			Source:      "orch",
			EventType:   "task_ready",
			Summary:     task.Title,
			PayloadJSON: marshalJSON(map[string]any{"task_id": taskID}),
			CreatedAt:   now,
		}); err != nil {
			return CouncilStartResult{}, err
		}

		dispatchResult, finalizeWorkspace, err := s.dispatchTaskTx(
			ctx,
			tx,
			task,
			reviewerRole,
			buildCouncilTaskBody(councilRun, councilInput, reviewerRole),
			"",
			nil,
			now,
		)
		if err != nil {
			return CouncilStartResult{}, err
		}
		defer finalizeWorkspace(false)

		_, err = tx.ExecContext(
			ctx,
			`INSERT INTO council_reviewers (run_id, reviewer_role, task_id, status)
			 VALUES (?, ?, ?, ?)`,
			runID,
			reviewerRole,
			taskID,
			dispatchResult.Task.Status,
		)
		if err != nil {
			return CouncilStartResult{}, fmt.Errorf("insert council reviewer row: %w", err)
		}

		reviewers = append(reviewers, CouncilReviewer{
			ReviewerRole: reviewerRole,
			TaskID:       taskID,
			Status:       dispatchResult.Task.Status,
		})
	}

	if err := insertEvent(ctx, tx, eventInput{
		RunID:     runID,
		Source:    "orch",
		EventType: "council_started",
		Summary:   "council reviewers dispatched",
		PayloadJSON: marshalJSON(map[string]any{
			"mode":           councilRun.Mode,
			"target_type":    councilRun.TargetType,
			"output_mode":    councilRun.OutputMode,
			"only_unanimous": councilRun.OnlyUnanimous,
			"reviewers":      reviewers,
		}),
		CreatedAt: now,
	}); err != nil {
		return CouncilStartResult{}, err
	}

	if err := updateRunAggregateStatus(ctx, tx, runID, now); err != nil {
		return CouncilStartResult{}, err
	}

	if err := tx.Commit(); err != nil {
		return CouncilStartResult{}, fmt.Errorf("commit council start transaction: %w", err)
	}

	return CouncilStartResult{
		Run:       councilRun,
		Input:     councilInput,
		Reviewers: reviewers,
	}, nil
}

func normalizeCouncilRun(input CouncilStartInput) (CouncilRun, error) {
	mode := defaultString(strings.TrimSpace(input.Mode), "brainstorm")
	switch mode {
	case "brainstorm", "review":
	default:
		return CouncilRun{}, fmt.Errorf("%w: mode must be brainstorm or review", ErrInvalidInput)
	}

	targetType := defaultString(strings.TrimSpace(input.TargetType), "mixed")
	switch targetType {
	case "text", "repo", "mixed":
	default:
		return CouncilRun{}, fmt.Errorf("%w: target-type must be text, repo, or mixed", ErrInvalidInput)
	}

	outputMode := defaultString(strings.TrimSpace(input.OutputMode), "both")
	switch outputMode {
	case "markdown", "json", "both":
	default:
		return CouncilRun{}, fmt.Errorf("%w: output must be markdown, json, or both", ErrInvalidInput)
	}

	return CouncilRun{
		RunID:         strings.TrimSpace(input.RunID),
		Mode:          mode,
		TargetType:    targetType,
		OutputMode:    outputMode,
		OnlyUnanimous: input.OnlyUnanimous,
	}, nil
}

func normalizeCouncilInput(input CouncilStartInput) (CouncilInput, error) {
	result := CouncilInput{
		RunID:        strings.TrimSpace(input.RunID),
		Prompt:       strings.TrimSpace(input.Target),
		TargetFile:   strings.TrimSpace(input.TargetFile),
		RepoPath:     strings.TrimSpace(input.RepoPath),
		TargetTaskID: strings.TrimSpace(input.TargetTaskID),
	}

	if result.Prompt == "" && result.TargetFile == "" && result.RepoPath == "" && result.TargetTaskID == "" {
		return CouncilInput{}, fmt.Errorf("%w: at least one of target, target-file, repo-path, or task-id is required", ErrInvalidInput)
	}

	return result, nil
}

func buildCouncilRunGoal(input CouncilInput) string {
	switch {
	case input.Prompt != "":
		return "Council review: " + truncateSingleLine(input.Prompt, 80)
	case input.TargetTaskID != "":
		return "Council review for task " + input.TargetTaskID
	case input.TargetFile != "":
		return "Council review for " + input.TargetFile
	case input.RepoPath != "":
		return "Council review for repo " + input.RepoPath
	default:
		return "Council review"
	}
}

func buildCouncilRunSummary(run CouncilRun, input CouncilInput) string {
	return fmt.Sprintf("%s council (%s)", run.Mode, run.TargetType)
}

func buildCouncilTaskTitle(reviewerRole string) string {
	switch reviewerRole {
	case "architecture-reviewer":
		return "Council architecture review"
	case "implementation-reviewer":
		return "Council implementation review"
	case "risk-reviewer":
		return "Council risk review"
	default:
		return "Council review"
	}
}

func buildCouncilTaskSummary(reviewerRole string) string {
	switch reviewerRole {
	case "architecture-reviewer":
		return "Review the target for architecture, boundaries, and interfaces"
	case "implementation-reviewer":
		return "Review the target for simplicity, maintainability, and practicality"
	case "risk-reviewer":
		return "Review the target for regressions, correctness, and operability risks"
	default:
		return "Review the target"
	}
}

func buildCouncilTaskAcceptanceJSON(run CouncilRun, input CouncilInput, reviewerRole string) string {
	return marshalJSON(map[string]any{
		"mode": "analysis",
		"council": map[string]any{
			"reviewer_role":  reviewerRole,
			"council_mode":   run.Mode,
			"target_type":    run.TargetType,
			"output_mode":    run.OutputMode,
			"only_unanimous": run.OnlyUnanimous,
			"target": map[string]any{
				"prompt":      input.Prompt,
				"target_file": input.TargetFile,
				"repo_path":   input.RepoPath,
				"task_id":     input.TargetTaskID,
			},
			"response_format": map[string]any{
				"reviewer_role": reviewerRole,
				"findings": []map[string]any{
					{
						"title":       "string",
						"summary":     "string",
						"proposal":    "string",
						"rationale":   "string",
						"confidence":  "low|medium|high",
						"tags":        []string{},
						"target_refs": map[string]any{},
					},
				},
			},
		},
	})
}

func buildCouncilTaskBody(run CouncilRun, input CouncilInput, reviewerRole string) string {
	parts := []string{
		fmt.Sprintf("Reviewer role: %s", reviewerRole),
		fmt.Sprintf("Council mode: %s", run.Mode),
		fmt.Sprintf("Target type: %s", run.TargetType),
		"Analyze the target from your assigned reviewer perspective.",
		"Return structured findings with title, summary, proposal, rationale, confidence, tags, and optional target references.",
	}

	if input.Prompt != "" {
		parts = append(parts, "", "Prompt:", input.Prompt)
	}
	if input.TargetFile != "" {
		parts = append(parts, "", "Target file:", input.TargetFile)
	}
	if input.RepoPath != "" {
		parts = append(parts, "", "Repo path:", input.RepoPath)
	}
	if input.TargetTaskID != "" {
		parts = append(parts, "", "Related task id:", input.TargetTaskID)
	}

	return strings.Join(parts, "\n")
}

func truncateSingleLine(value string, maxLen int) string {
	value = strings.TrimSpace(value)
	value = strings.ReplaceAll(value, "\n", " ")
	value = strings.ReplaceAll(value, "\r", " ")
	value = strings.Join(strings.Fields(value), " ")
	if maxLen <= 0 || len(value) <= maxLen {
		return value
	}
	if maxLen <= 3 {
		return value[:maxLen]
	}
	return value[:maxLen-3] + "..."
}

func boolToInt(value bool) int {
	if value {
		return 1
	}
	return 0
}

func (s *OrchStore) WaitForCouncil(ctx context.Context, input CouncilWaitInput) (CouncilWaitResult, error) {
	runID := strings.TrimSpace(input.RunID)
	if runID == "" {
		return CouncilWaitResult{}, fmt.Errorf("%w: run id is required", ErrInvalidInput)
	}

	if _, err := s.GetCouncilRun(ctx, runID); err != nil {
		return CouncilWaitResult{}, err
	}

	waitCtx := ctx
	cancel := func() {}
	if input.Timeout > 0 {
		waitCtx, cancel = context.WithTimeout(ctx, input.Timeout)
	}
	defer cancel()

	for {
		reviewers, allComplete, err := s.GetCouncilReviewerStatuses(waitCtx, runID)
		if err != nil {
			if isDeadlineExceeded(waitCtx) {
				return CouncilWaitResult{
					Woke:             false,
					RunID:            runID,
					AllComplete:      false,
					ReviewerStatuses: reviewers,
				}, nil
			}
			return CouncilWaitResult{}, err
		}
		if allComplete {
			return CouncilWaitResult{
				Woke:             true,
				RunID:            runID,
				AllComplete:      true,
				ReviewerStatuses: reviewers,
			}, nil
		}

		if _, err := s.ReconcileRun(waitCtx, runID); err != nil {
			if isSQLiteBusyError(err) {
				ok, waitErr := waitForNextPoll(waitCtx, 25*time.Millisecond)
				if waitErr != nil {
					if errors.Is(waitErr, context.DeadlineExceeded) {
						reviewers, _, _ := s.GetCouncilReviewerStatuses(ctx, runID)
						return CouncilWaitResult{
							Woke:             false,
							RunID:            runID,
							AllComplete:      false,
							ReviewerStatuses: reviewers,
						}, nil
					}
					return CouncilWaitResult{}, waitErr
				}
				if !ok {
					reviewers, _, _ := s.GetCouncilReviewerStatuses(ctx, runID)
					return CouncilWaitResult{
						Woke:             false,
						RunID:            runID,
						AllComplete:      false,
						ReviewerStatuses: reviewers,
					}, nil
				}
				continue
			}
			if isDeadlineExceeded(waitCtx) {
				reviewers, _, _ := s.GetCouncilReviewerStatuses(ctx, runID)
				return CouncilWaitResult{
					Woke:             false,
					RunID:            runID,
					AllComplete:      false,
					ReviewerStatuses: reviewers,
				}, nil
			}
			return CouncilWaitResult{}, err
		}

		ok, err := waitForNextPoll(waitCtx, 200*time.Millisecond)
		if err != nil {
			if errors.Is(err, context.DeadlineExceeded) {
				reviewers, _, _ := s.GetCouncilReviewerStatuses(ctx, runID)
				return CouncilWaitResult{
					Woke:             false,
					RunID:            runID,
					AllComplete:      false,
					ReviewerStatuses: reviewers,
				}, nil
			}
			return CouncilWaitResult{}, err
		}
		if !ok {
			reviewers, _, _ := s.GetCouncilReviewerStatuses(ctx, runID)
			return CouncilWaitResult{
				Woke:             false,
				RunID:            runID,
				AllComplete:      false,
				ReviewerStatuses: reviewers,
			}, nil
		}
	}
}

func (s *OrchStore) GetCouncilRun(ctx context.Context, runID string) (CouncilRun, error) {
	row := s.db.QueryRowContext(
		ctx,
		`SELECT run_id, mode, target_type, output_mode, only_unanimous
		 FROM council_runs
		 WHERE run_id = ?`,
		runID,
	)

	var (
		run           CouncilRun
		onlyUnanimous int
	)
	err := row.Scan(&run.RunID, &run.Mode, &run.TargetType, &run.OutputMode, &onlyUnanimous)
	if errors.Is(err, sql.ErrNoRows) {
		return CouncilRun{}, fmt.Errorf("%w: council run %s not found", ErrRunNotFound, runID)
	}
	if err != nil {
		return CouncilRun{}, fmt.Errorf("scan council run: %w", err)
	}
	run.OnlyUnanimous = onlyUnanimous != 0
	return run, nil
}

func (s *OrchStore) GetCouncilReviewerStatuses(ctx context.Context, runID string) ([]CouncilReviewer, bool, error) {
	rows, err := s.db.QueryContext(
		ctx,
		`SELECT cr.reviewer_role, cr.task_id, t.status
		 FROM council_reviewers cr
		 JOIN tasks t
		   ON t.run_id = cr.run_id
		  AND t.task_id = cr.task_id
		 WHERE cr.run_id = ?
		 ORDER BY cr.reviewer_role ASC`,
		runID,
	)
	if err != nil {
		return nil, false, fmt.Errorf("query council reviewer statuses: %w", err)
	}
	defer rows.Close()

	reviewers := make([]CouncilReviewer, 0, len(councilReviewerRoles))
	allComplete := true
	for rows.Next() {
		var reviewer CouncilReviewer
		if err := rows.Scan(&reviewer.ReviewerRole, &reviewer.TaskID, &reviewer.Status); err != nil {
			return nil, false, fmt.Errorf("scan council reviewer status: %w", err)
		}
		if reviewer.Status != "done" && reviewer.Status != "failed" && reviewer.Status != "cancelled" {
			allComplete = false
		}
		reviewers = append(reviewers, reviewer)
	}
	if err := rows.Err(); err != nil {
		return nil, false, fmt.Errorf("iterate council reviewer statuses: %w", err)
	}
	if len(reviewers) == 0 {
		return nil, false, fmt.Errorf("%w: council reviewers for run %s not found", ErrRunNotFound, runID)
	}

	return reviewers, allComplete, nil
}

func (s *OrchStore) TallyCouncil(ctx context.Context, input CouncilTallyInput) (CouncilTallyResult, error) {
	runID := strings.TrimSpace(input.RunID)
	if runID == "" {
		return CouncilTallyResult{}, fmt.Errorf("%w: run id is required", ErrInvalidInput)
	}

	similarity := defaultString(strings.TrimSpace(input.Similarity), "normal")
	if similarity != "normal" && similarity != "strict" {
		return CouncilTallyResult{}, fmt.Errorf("%w: similarity must be strict or normal", ErrInvalidInput)
	}

	if _, err := s.GetCouncilRun(ctx, runID); err != nil {
		return CouncilTallyResult{}, err
	}

	if _, err := s.ReconcileRun(ctx, runID); err != nil && !isSQLiteBusyError(err) {
		return CouncilTallyResult{}, err
	}

	reviewers, allComplete, err := s.GetCouncilReviewerStatuses(ctx, runID)
	if err != nil {
		return CouncilTallyResult{}, err
	}
	if !allComplete {
		return CouncilTallyResult{}, fmt.Errorf("%w: council reviewers are not complete yet", ErrInvalidState)
	}

	findings, err := s.collectCouncilFindings(ctx, runID, reviewers)
	if err != nil {
		return CouncilTallyResult{}, err
	}
	groups := groupCouncilFindings(runID, findings, reviewers, similarity)
	counts := make(map[string]int)
	for _, group := range groups {
		counts[group.Bucket]++
	}

	tx, err := s.db.BeginTx(ctx, nil)
	if err != nil {
		return CouncilTallyResult{}, fmt.Errorf("begin council tally transaction: %w", err)
	}
	defer tx.Rollback()

	if _, err := tx.ExecContext(ctx, `DELETE FROM council_findings WHERE run_id = ?`, runID); err != nil {
		return CouncilTallyResult{}, fmt.Errorf("clear council findings: %w", err)
	}
	if _, err := tx.ExecContext(ctx, `DELETE FROM council_groups WHERE run_id = ?`, runID); err != nil {
		return CouncilTallyResult{}, fmt.Errorf("clear council groups: %w", err)
	}

	for _, finding := range findings {
		if _, err := tx.ExecContext(
			ctx,
			`INSERT INTO council_findings (
				run_id, reviewer_role, finding_id, title, summary, proposal, rationale,
				confidence, tags_json, target_refs_json
			) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
			finding.RunID,
			finding.ReviewerRole,
			finding.FindingID,
			finding.Title,
			finding.Summary,
			finding.Proposal,
			finding.Rationale,
			finding.Confidence,
			string(finding.TagsJSON),
			string(finding.TargetRefsJSON),
		); err != nil {
			return CouncilTallyResult{}, fmt.Errorf("insert council finding: %w", err)
		}
	}

	for _, group := range groups {
		if _, err := tx.ExecContext(
			ctx,
			`INSERT INTO council_groups (
				run_id, group_id, proposal, bucket, support_count, supporters_json,
				dissenters_json, rationale_summary, tags_json, source_finding_ids_json
			) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
			group.RunID,
			group.GroupID,
			group.Proposal,
			group.Bucket,
			group.SupportCount,
			string(group.SupportersJSON),
			string(group.DissentersJSON),
			group.RationaleSummary,
			string(group.TagsJSON),
			string(group.SourceFindingIDsJSON),
		); err != nil {
			return CouncilTallyResult{}, fmt.Errorf("insert council group: %w", err)
		}
	}

	if err := insertEvent(ctx, tx, eventInput{
		RunID:     runID,
		Source:    "orch",
		EventType: "council_tallied",
		Summary:   "council recommendations grouped",
		PayloadJSON: marshalJSON(map[string]any{
			"similarity": similarity,
			"counts":     counts,
		}),
		CreatedAt: nowUTC(),
	}); err != nil {
		return CouncilTallyResult{}, err
	}

	if err := tx.Commit(); err != nil {
		return CouncilTallyResult{}, fmt.Errorf("commit council tally transaction: %w", err)
	}

	return CouncilTallyResult{
		RunID:                  runID,
		Similarity:             similarity,
		Counts:                 counts,
		GroupedRecommendations: groups,
	}, nil
}

func (s *OrchStore) BuildCouncilReport(ctx context.Context, input CouncilReportInput) (CouncilReportResult, error) {
	runID := strings.TrimSpace(input.RunID)
	if runID == "" {
		return CouncilReportResult{}, fmt.Errorf("%w: run id is required", ErrInvalidInput)
	}

	run, err := s.GetCouncilRun(ctx, runID)
	if err != nil {
		return CouncilReportResult{}, err
	}
	councilInput, err := s.GetCouncilInput(ctx, runID)
	if err != nil {
		return CouncilReportResult{}, err
	}

	show, err := normalizeCouncilReportShow(input.Show, run.OnlyUnanimous)
	if err != nil {
		return CouncilReportResult{}, err
	}

	groups, tallied, err := s.ListCouncilGroups(ctx, runID)
	if err != nil {
		return CouncilReportResult{}, err
	}
	if !tallied {
		return CouncilReportResult{}, fmt.Errorf("%w: council groups are not available; run council tally first", ErrInvalidState)
	}

	summary := councilGroupSummary(groups)
	selectedGroups := selectCouncilGroupsForReport(groups, show)
	markdown := renderCouncilReportMarkdown(run, councilInput, show, summary, selectedGroups)

	return CouncilReportResult{
		RunID:                  runID,
		Show:                   show,
		Summary:                summary,
		GroupedRecommendations: selectedGroups,
		Markdown:               markdown,
	}, nil
}

func (s *OrchStore) PersistCouncilReport(ctx context.Context, input CouncilPersistReportInput) error {
	runID := strings.TrimSpace(input.RunID)
	if runID == "" {
		return fmt.Errorf("%w: run id is required", ErrInvalidInput)
	}
	if _, err := s.GetCouncilRun(ctx, runID); err != nil {
		return err
	}

	showJSON := marshalJSON(input.Show)
	summaryJSON := marshalJSON(normalizeCouncilSummary(input.Summary))
	markdownPath := strings.TrimSpace(input.MarkdownPath)
	now := nowUTC()

	tx, err := s.db.BeginTx(ctx, nil)
	if err != nil {
		return fmt.Errorf("begin council report transaction: %w", err)
	}
	defer tx.Rollback()

	if _, err := tx.ExecContext(
		ctx,
		`INSERT INTO council_reports (
			run_id, show_json, summary_json, markdown_path, created_at, updated_at
		) VALUES (?, ?, ?, ?, ?, ?)
		ON CONFLICT(run_id) DO UPDATE SET
			show_json = excluded.show_json,
			summary_json = excluded.summary_json,
			markdown_path = excluded.markdown_path,
			updated_at = excluded.updated_at`,
		runID,
		showJSON,
		summaryJSON,
		markdownPath,
		formatTime(now),
		formatTime(now),
	); err != nil {
		return fmt.Errorf("persist council report metadata: %w", err)
	}

	if err := insertEvent(ctx, tx, eventInput{
		RunID:     runID,
		Source:    "orch",
		EventType: "council_reported",
		Summary:   "council report generated",
		PayloadJSON: marshalJSON(map[string]any{
			"show":          input.Show,
			"markdown_path": markdownPath,
		}),
		CreatedAt: now,
	}); err != nil {
		return err
	}

	if err := tx.Commit(); err != nil {
		return fmt.Errorf("commit council report transaction: %w", err)
	}
	return nil
}

func (s *OrchStore) collectCouncilFindings(ctx context.Context, runID string, reviewers []CouncilReviewer) ([]CouncilFinding, error) {
	findings := make([]CouncilFinding, 0)
	for _, reviewer := range reviewers {
		if reviewer.Status != "done" {
			return nil, fmt.Errorf("%w: reviewer %s did not finish successfully", ErrInvalidState, reviewer.ReviewerRole)
		}

		message, err := s.loadCouncilReviewerResultMessage(ctx, runID, reviewer.TaskID)
		if err != nil {
			return nil, err
		}
		output, err := parseCouncilReviewerOutput(reviewer.ReviewerRole, message)
		if err != nil {
			return nil, err
		}
		for i, finding := range output.Findings {
			tagsJSON, err := normalizeOptionalJSONArray(finding.Tags)
			if err != nil {
				return nil, fmt.Errorf("%w: reviewer %s finding %d tags must be a JSON array", ErrInvalidInput, reviewer.ReviewerRole, i+1)
			}
			targetRefsJSON, err := normalizeOptionalJSONObject(finding.TargetRefs)
			if err != nil {
				return nil, fmt.Errorf("%w: reviewer %s finding %d target_refs must be a JSON object", ErrInvalidInput, reviewer.ReviewerRole, i+1)
			}
			confidence := strings.TrimSpace(finding.Confidence)
			switch confidence {
			case "low", "medium", "high":
			default:
				return nil, fmt.Errorf("%w: reviewer %s finding %d confidence must be low, medium, or high", ErrInvalidInput, reviewer.ReviewerRole, i+1)
			}
			if strings.TrimSpace(finding.Proposal) == "" {
				return nil, fmt.Errorf("%w: reviewer %s finding %d proposal is required", ErrInvalidInput, reviewer.ReviewerRole, i+1)
			}
			findings = append(findings, CouncilFinding{
				RunID:          runID,
				ReviewerRole:   reviewer.ReviewerRole,
				FindingID:      fmt.Sprintf("f%02d", i+1),
				Title:          strings.TrimSpace(finding.Title),
				Summary:        strings.TrimSpace(finding.Summary),
				Proposal:       strings.TrimSpace(finding.Proposal),
				Rationale:      strings.TrimSpace(finding.Rationale),
				Confidence:     confidence,
				TagsJSON:       json.RawMessage(tagsJSON),
				TargetRefsJSON: json.RawMessage(targetRefsJSON),
			})
		}
	}
	return findings, nil
}

func (s *OrchStore) GetCouncilInput(ctx context.Context, runID string) (CouncilInput, error) {
	row := s.db.QueryRowContext(
		ctx,
		`SELECT run_id, prompt, target_file, repo_path, target_task_id
		 FROM council_inputs
		 WHERE run_id = ?`,
		runID,
	)

	var input CouncilInput
	if err := row.Scan(
		&input.RunID,
		&input.Prompt,
		&input.TargetFile,
		&input.RepoPath,
		&input.TargetTaskID,
	); errors.Is(err, sql.ErrNoRows) {
		return CouncilInput{RunID: runID}, nil
	} else if err != nil {
		return CouncilInput{}, fmt.Errorf("scan council input: %w", err)
	}
	return input, nil
}

func (s *OrchStore) ListCouncilGroups(ctx context.Context, runID string) ([]CouncilGroup, bool, error) {
	rows, err := s.db.QueryContext(
		ctx,
		`SELECT
			run_id, group_id, proposal, bucket, support_count, supporters_json,
			dissenters_json, rationale_summary, tags_json, source_finding_ids_json
		 FROM council_groups
		 WHERE run_id = ?
		 ORDER BY
			CASE bucket
				WHEN 'consensus' THEN 1
				WHEN 'majority' THEN 2
				WHEN 'minority' THEN 3
				ELSE 4
			END,
			support_count DESC,
			group_id ASC`,
		runID,
	)
	if err != nil {
		return nil, false, fmt.Errorf("query council groups: %w", err)
	}
	defer rows.Close()

	groups := make([]CouncilGroup, 0)
	for rows.Next() {
		var group CouncilGroup
		var supportersJSON string
		var dissentersJSON string
		var tagsJSON string
		var sourceFindingIDsJSON string
		if err := rows.Scan(
			&group.RunID,
			&group.GroupID,
			&group.Proposal,
			&group.Bucket,
			&group.SupportCount,
			&supportersJSON,
			&dissentersJSON,
			&group.RationaleSummary,
			&tagsJSON,
			&sourceFindingIDsJSON,
		); err != nil {
			return nil, false, fmt.Errorf("scan council group: %w", err)
		}
		group.SupportersJSON = json.RawMessage(supportersJSON)
		group.DissentersJSON = json.RawMessage(dissentersJSON)
		group.TagsJSON = json.RawMessage(tagsJSON)
		group.SourceFindingIDsJSON = json.RawMessage(sourceFindingIDsJSON)
		groups = append(groups, group)
	}
	if err := rows.Err(); err != nil {
		return nil, false, fmt.Errorf("iterate council groups: %w", err)
	}

	if len(groups) > 0 {
		return groups, true, nil
	}

	tallied, err := s.hasCouncilTallyEvent(ctx, runID)
	if err != nil {
		return nil, false, err
	}
	return groups, tallied, nil
}

func (s *OrchStore) hasCouncilTallyEvent(ctx context.Context, runID string) (bool, error) {
	var count int
	if err := s.db.QueryRowContext(
		ctx,
		`SELECT COUNT(*)
		 FROM events
		 WHERE run_id = ? AND event_type = 'council_tallied'`,
		runID,
	).Scan(&count); err != nil {
		return false, fmt.Errorf("query council tally events: %w", err)
	}
	return count > 0, nil
}

func (s *OrchStore) loadCouncilReviewerResultMessage(ctx context.Context, runID, taskID string) (Message, error) {
	task, err := selectTask(ctx, s.db, runID, taskID)
	if err != nil {
		return Message{}, err
	}
	if task.LatestAttemptNo == 0 {
		return Message{}, fmt.Errorf("%w: reviewer task %s has no attempt", ErrInvalidState, taskID)
	}

	attempt, err := selectAttempt(ctx, s.db, runID, taskID, task.LatestAttemptNo)
	if err != nil {
		return Message{}, err
	}

	row := s.db.QueryRowContext(
		ctx,
		`SELECT
			message_id, thread_id, from_agent, to_agent, kind, summary, body,
			payload_json, created_at
		 FROM messages
		 WHERE thread_id = ? AND kind = 'result'
		 ORDER BY created_at DESC
		 LIMIT 1`,
		attempt.ThreadID,
	)
	message, err := scanMessage(row)
	if errors.Is(err, sql.ErrNoRows) {
		return Message{}, fmt.Errorf("%w: reviewer task %s has no result message", ErrInvalidState, taskID)
	}
	if err != nil {
		return Message{}, err
	}
	return message, nil
}

func parseCouncilReviewerOutput(expectedRole string, message Message) (councilReviewerOutput, error) {
	candidates := []string{strings.TrimSpace(message.Body), strings.TrimSpace(string(message.PayloadJSON))}
	var lastErr error
	for _, candidate := range candidates {
		if candidate == "" || candidate == "{}" {
			continue
		}
		var output councilReviewerOutput
		if err := json.Unmarshal([]byte(candidate), &output); err != nil {
			lastErr = err
			continue
		}
		if strings.TrimSpace(output.ReviewerRole) == "" {
			return councilReviewerOutput{}, fmt.Errorf("%w: reviewer output must include reviewer_role", ErrInvalidInput)
		}
		if output.ReviewerRole != expectedRole {
			return councilReviewerOutput{}, fmt.Errorf("%w: reviewer output role %s does not match expected %s", ErrInvalidInput, output.ReviewerRole, expectedRole)
		}
		return output, nil
	}
	if lastErr != nil {
		return councilReviewerOutput{}, fmt.Errorf("%w: reviewer output must be valid JSON", ErrInvalidInput)
	}
	return councilReviewerOutput{}, fmt.Errorf("%w: reviewer result message did not contain council output JSON", ErrInvalidInput)
}

func normalizeOptionalJSONArray(raw json.RawMessage) (string, error) {
	if len(raw) == 0 || strings.TrimSpace(string(raw)) == "" || strings.TrimSpace(string(raw)) == "null" {
		return "[]", nil
	}
	var value []any
	if err := json.Unmarshal(raw, &value); err != nil {
		return "", err
	}
	return marshalJSON(value), nil
}

func normalizeOptionalJSONObject(raw json.RawMessage) (string, error) {
	if len(raw) == 0 || strings.TrimSpace(string(raw)) == "" || strings.TrimSpace(string(raw)) == "null" {
		return "{}", nil
	}
	var value map[string]any
	if err := json.Unmarshal(raw, &value); err != nil {
		return "", err
	}
	return marshalJSON(value), nil
}

func groupCouncilFindings(runID string, findings []CouncilFinding, reviewers []CouncilReviewer, similarity string) []CouncilGroup {
	type groupedFinding struct {
		key      string
		proposal string
		findings []CouncilFinding
	}

	order := make([]string, 0)
	groupsByKey := make(map[string]*groupedFinding)
	for _, finding := range findings {
		key := councilProposalGroupKey(finding.Proposal, similarity)
		group, ok := groupsByKey[key]
		if !ok {
			group = &groupedFinding{
				key:      key,
				proposal: finding.Proposal,
			}
			groupsByKey[key] = group
			order = append(order, key)
		}
		group.findings = append(group.findings, finding)
	}

	sortedReviewers := make([]string, 0, len(reviewers))
	for _, reviewer := range reviewers {
		sortedReviewers = append(sortedReviewers, reviewer.ReviewerRole)
	}
	sort.Strings(sortedReviewers)

	result := make([]CouncilGroup, 0, len(order))
	for idx, key := range order {
		group := groupsByKey[key]
		supporterSet := make(map[string]struct{})
		tagSet := make(map[string]struct{})
		sourceFindingIDs := make([]string, 0, len(group.findings))
		rationaleSummary := ""

		for _, finding := range group.findings {
			supporterSet[finding.ReviewerRole] = struct{}{}
			sourceFindingIDs = append(sourceFindingIDs, finding.ReviewerRole+":"+finding.FindingID)
			if rationaleSummary == "" && finding.Rationale != "" {
				rationaleSummary = finding.Rationale
			}

			var tags []string
			if len(finding.TagsJSON) > 0 {
				_ = json.Unmarshal(finding.TagsJSON, &tags)
			}
			for _, tag := range tags {
				tag = strings.TrimSpace(tag)
				if tag != "" {
					tagSet[tag] = struct{}{}
				}
			}
		}

		supporters := make([]string, 0, len(supporterSet))
		for _, reviewer := range sortedReviewers {
			if _, ok := supporterSet[reviewer]; ok {
				supporters = append(supporters, reviewer)
			}
		}
		dissenters := make([]string, 0, len(sortedReviewers)-len(supporters))
		for _, reviewer := range sortedReviewers {
			if _, ok := supporterSet[reviewer]; !ok {
				dissenters = append(dissenters, reviewer)
			}
		}

		tags := make([]string, 0, len(tagSet))
		for tag := range tagSet {
			tags = append(tags, tag)
		}
		sort.Strings(tags)
		sort.Strings(sourceFindingIDs)

		supportCount := len(supporters)
		bucket := "minority"
		if supportCount == 3 {
			bucket = "consensus"
		} else if supportCount == 2 {
			bucket = "majority"
		}

		result = append(result, CouncilGroup{
			RunID:                runID,
			GroupID:              fmt.Sprintf("grp_%02d", idx+1),
			Proposal:             group.proposal,
			Bucket:               bucket,
			SupportCount:         supportCount,
			SupportersJSON:       json.RawMessage(marshalJSON(supporters)),
			DissentersJSON:       json.RawMessage(marshalJSON(dissenters)),
			RationaleSummary:     rationaleSummary,
			TagsJSON:             json.RawMessage(marshalJSON(tags)),
			SourceFindingIDsJSON: json.RawMessage(marshalJSON(sourceFindingIDs)),
		})
	}

	sort.SliceStable(result, func(i, j int) bool {
		if result[i].SupportCount != result[j].SupportCount {
			return result[i].SupportCount > result[j].SupportCount
		}
		return result[i].Proposal < result[j].Proposal
	})
	for i := range result {
		result[i].GroupID = fmt.Sprintf("grp_%02d", i+1)
	}
	return result
}

func normalizeCouncilReportShow(raw string, onlyUnanimous bool) ([]string, error) {
	if strings.TrimSpace(raw) == "" {
		if onlyUnanimous {
			return []string{"consensus"}, nil
		}
		return []string{"consensus", "majority"}, nil
	}

	parts := strings.Split(raw, ",")
	show := make([]string, 0, len(parts))
	seen := make(map[string]struct{}, len(parts))
	for _, part := range parts {
		value := strings.ToLower(strings.TrimSpace(part))
		if value == "" {
			continue
		}
		if value == "all" {
			return []string{"consensus", "majority", "minority"}, nil
		}
		switch value {
		case "consensus", "majority", "minority":
		default:
			return nil, fmt.Errorf("%w: show must contain consensus, majority, minority, or all", ErrInvalidInput)
		}
		if _, ok := seen[value]; ok {
			continue
		}
		seen[value] = struct{}{}
		show = append(show, value)
	}
	if len(show) == 0 {
		return nil, fmt.Errorf("%w: show must contain at least one bucket", ErrInvalidInput)
	}
	return show, nil
}

func councilGroupSummary(groups []CouncilGroup) map[string]int {
	summary := normalizeCouncilSummary(nil)
	for _, group := range groups {
		summary[group.Bucket]++
	}
	return summary
}

func normalizeCouncilSummary(summary map[string]int) map[string]int {
	result := map[string]int{
		"consensus": 0,
		"majority":  0,
		"minority":  0,
	}
	for key, value := range summary {
		result[key] = value
	}
	return result
}

func selectCouncilGroupsForReport(groups []CouncilGroup, show []string) []CouncilGroup {
	groupedByBucket := make(map[string][]CouncilGroup, len(show))
	for _, group := range groups {
		groupedByBucket[group.Bucket] = append(groupedByBucket[group.Bucket], group)
	}

	selected := make([]CouncilGroup, 0, len(groups))
	for _, bucket := range show {
		selected = append(selected, groupedByBucket[bucket]...)
	}
	return selected
}

func renderCouncilReportMarkdown(run CouncilRun, input CouncilInput, show []string, summary map[string]int, groups []CouncilGroup) string {
	var builder strings.Builder

	builder.WriteString("# Council Review Report\n\n")
	builder.WriteString(fmt.Sprintf("- Run ID: `%s`\n", run.RunID))
	builder.WriteString(fmt.Sprintf("- Mode: `%s`\n", run.Mode))
	builder.WriteString(fmt.Sprintf("- Target Type: `%s`\n", run.TargetType))
	builder.WriteString(fmt.Sprintf("- Report Buckets: `%s`\n\n", strings.Join(show, "`, `")))

	builder.WriteString("## Target\n\n")
	if strings.TrimSpace(input.Prompt) != "" {
		builder.WriteString(fmt.Sprintf("- Prompt: %s\n", input.Prompt))
	}
	if strings.TrimSpace(input.TargetFile) != "" {
		builder.WriteString(fmt.Sprintf("- Target File: `%s`\n", input.TargetFile))
	}
	if strings.TrimSpace(input.RepoPath) != "" {
		builder.WriteString(fmt.Sprintf("- Repo Path: `%s`\n", input.RepoPath))
	}
	if strings.TrimSpace(input.TargetTaskID) != "" {
		builder.WriteString(fmt.Sprintf("- Task ID: `%s`\n", input.TargetTaskID))
	}
	if strings.TrimSpace(input.Prompt) == "" &&
		strings.TrimSpace(input.TargetFile) == "" &&
		strings.TrimSpace(input.RepoPath) == "" &&
		strings.TrimSpace(input.TargetTaskID) == "" {
		builder.WriteString("- No explicit target metadata was recorded.\n")
	}
	builder.WriteString("\n")

	builder.WriteString("## Summary\n\n")
	builder.WriteString(fmt.Sprintf("- Consensus: %d\n", summary["consensus"]))
	builder.WriteString(fmt.Sprintf("- Majority: %d\n", summary["majority"]))
	builder.WriteString(fmt.Sprintf("- Minority: %d\n\n", summary["minority"]))

	groupedByBucket := make(map[string][]CouncilGroup, len(show))
	for _, group := range groups {
		groupedByBucket[group.Bucket] = append(groupedByBucket[group.Bucket], group)
	}

	for _, bucket := range show {
		builder.WriteString(fmt.Sprintf("## %s\n\n", councilBucketHeading(bucket)))
		bucketGroups := groupedByBucket[bucket]
		if len(bucketGroups) == 0 {
			builder.WriteString(fmt.Sprintf("No %s recommendations.\n\n", bucket))
			continue
		}

		for _, group := range bucketGroups {
			supporters := decodeCouncilStringSlice(group.SupportersJSON)
			dissenters := decodeCouncilStringSlice(group.DissentersJSON)
			tags := decodeCouncilStringSlice(group.TagsJSON)
			sourceFindingIDs := decodeCouncilStringSlice(group.SourceFindingIDsJSON)

			builder.WriteString(fmt.Sprintf("### %s\n\n", group.GroupID))
			builder.WriteString(group.Proposal)
			builder.WriteString("\n\n")
			builder.WriteString(fmt.Sprintf("- Support: %d of 3 reviewers", group.SupportCount))
			if len(supporters) > 0 {
				builder.WriteString(fmt.Sprintf(" (`%s`)", strings.Join(supporters, "`, `")))
			}
			builder.WriteString("\n")
			if len(dissenters) > 0 {
				builder.WriteString(fmt.Sprintf("- Dissenters: `%s`\n", strings.Join(dissenters, "`, `")))
			}
			if strings.TrimSpace(group.RationaleSummary) != "" {
				builder.WriteString(fmt.Sprintf("- Rationale: %s\n", group.RationaleSummary))
			}
			if len(tags) > 0 {
				builder.WriteString(fmt.Sprintf("- Tags: `%s`\n", strings.Join(tags, "`, `")))
			}
			if len(sourceFindingIDs) > 0 {
				builder.WriteString(fmt.Sprintf("- Source Findings: `%s`\n", strings.Join(sourceFindingIDs, "`, `")))
			}
			builder.WriteString("\n")
		}
	}

	return builder.String()
}

func councilBucketHeading(bucket string) string {
	switch bucket {
	case "consensus":
		return "Consensus"
	case "majority":
		return "Majority"
	case "minority":
		return "Minority"
	default:
		if bucket == "" {
			return "Recommendations"
		}
		return strings.ToUpper(bucket[:1]) + bucket[1:]
	}
}

func decodeCouncilStringSlice(raw json.RawMessage) []string {
	if len(raw) == 0 || strings.TrimSpace(string(raw)) == "" || strings.TrimSpace(string(raw)) == "null" {
		return nil
	}

	var values []string
	if err := json.Unmarshal(raw, &values); err != nil {
		return nil
	}

	result := make([]string, 0, len(values))
	for _, value := range values {
		value = strings.TrimSpace(value)
		if value != "" {
			result = append(result, value)
		}
	}
	return result
}

func councilProposalGroupKey(proposal, similarity string) string {
	tokens := proposalTokens(proposal)
	if similarity == "strict" {
		return strings.Join(tokens, " ")
	}

	stopWords := map[string]struct{}{
		"a": {}, "an": {}, "the": {}, "to": {}, "into": {}, "and": {}, "or": {}, "of": {}, "for": {}, "in": {}, "on": {}, "with": {}, "from": {}, "that": {}, "this": {}, "it": {}, "is": {}, "are": {}, "be": {}, "by": {}, "as": {}, "keep": {}, "use": {}, "add": {},
	}
	set := make(map[string]struct{})
	filtered := make([]string, 0, len(tokens))
	for _, token := range tokens {
		if _, stop := stopWords[token]; stop {
			continue
		}
		if len(token) <= 2 {
			continue
		}
		if _, seen := set[token]; seen {
			continue
		}
		set[token] = struct{}{}
		filtered = append(filtered, token)
	}
	sort.Strings(filtered)
	if len(filtered) == 0 {
		return strings.Join(tokens, " ")
	}
	return strings.Join(filtered, " ")
}

func proposalTokens(value string) []string {
	lower := strings.ToLower(strings.TrimSpace(value))
	fields := strings.FieldsFunc(lower, func(r rune) bool {
		return !((r >= 'a' && r <= 'z') || (r >= '0' && r <= '9'))
	})
	result := make([]string, 0, len(fields))
	for _, field := range fields {
		if field != "" {
			result = append(result, field)
		}
	}
	return result
}