package runtimecodex

import (
	"context"
	"encoding/json"
	"fmt"
	"os"
	"path"
	"path/filepath"
	"strings"

	"inbox/internal/app/runtimeconfig"
	"inbox/internal/domain/role"
)

const (
	WorkspaceDir      = ".inbox/runtime-codex"
	ContainerDir      = "/workspace/.inbox/runtime-codex"
	ContainerHome     = "/root"
	ContainerCodex    = "/root/.codex"
	configFilename    = "config.toml"
	authFilename      = "auth.json"
)

type RoleCatalog interface {
	ListRoles(ctx context.Context) ([]role.Definition, error)
}

type RoleResolver interface {
	ResolveRole(ctx context.Context, workspaceID, roleName string) (runtimeconfig.ResolvedRole, error)
}

type Materializer struct {
	roles    RoleCatalog
	resolver RoleResolver
}

func NewMaterializer(roles RoleCatalog, resolver RoleResolver) *Materializer {
	return &Materializer{
		roles:    roles,
		resolver: resolver,
	}
}

func (m *Materializer) Sync(ctx context.Context, workspaceID, workspaceRoot string) error {
	if m == nil {
		return nil
	}
	if strings.TrimSpace(workspaceRoot) == "" {
		return fmt.Errorf("workspace root is required")
	}
	items, err := m.roles.ListRoles(ctx)
	if err != nil {
		return fmt.Errorf("list roles for runtime codex config: %w", err)
	}

	baseDir := filepath.Join(workspaceRoot, ".inbox")
	liveDir := filepath.Join(workspaceRoot, filepath.FromSlash(WorkspaceDir))
	if err := os.MkdirAll(baseDir, 0755); err != nil {
		return fmt.Errorf("ensure runtime codex base dir: %w", err)
	}

	tmpDir, err := os.MkdirTemp(baseDir, "runtime-codex-")
	if err != nil {
		return fmt.Errorf("create runtime codex temp dir: %w", err)
	}
	cleanup := func() { _ = os.RemoveAll(tmpDir) }

	for _, item := range items {
		item = role.NormalizeDefinition(item)
		if !item.IsEnabled || item.ExecutorKind != role.ExecutorKindCodex {
			continue
		}
		resolved, err := m.resolver.ResolveRole(ctx, workspaceID, item.Name)
		if err != nil {
			cleanup()
			return fmt.Errorf("resolve role %q for runtime codex config: %w", item.Name, err)
		}
		if _, err := WriteResolvedRoleHome(tmpDir, resolved); err != nil {
			cleanup()
			return fmt.Errorf("write runtime codex home for %q: %w", item.Name, err)
		}
		if err := writeResolvedRoleSkills(tmpDir, resolved); err != nil {
			cleanup()
			return fmt.Errorf("write runtime codex skills for %q: %w", item.Name, err)
		}
	}

	_ = os.RemoveAll(liveDir)
	if err := os.Rename(tmpDir, liveDir); err != nil {
		cleanup()
		return fmt.Errorf("publish runtime codex dir: %w", err)
	}
	return nil
}

func ContainerHomeDir(roleName string) string {
	return path.Join(ContainerDir, sanitizeRolePath(roleName))
}

func ContainerUserHomeDir() string {
	return ContainerHome
}

func ContainerCodexDir() string {
	return ContainerCodex
}

func WorkspaceHomeDir(workspaceRoot, roleName string) string {
	return filepath.Join(workspaceRoot, filepath.FromSlash(WorkspaceDir), sanitizeRolePath(roleName))
}

func WorkspaceCodexDir(workspaceRoot, roleName string) string {
	return filepath.Join(WorkspaceHomeDir(workspaceRoot, roleName), ".codex")
}

func WriteResolvedRoleHome(root string, resolved runtimeconfig.ResolvedRole) (string, error) {
	roleHome := filepath.Join(root, sanitizeRolePath(resolved.Role.Name))
	codexDir := filepath.Join(roleHome, ".codex")
	if err := os.MkdirAll(codexDir, 0755); err != nil {
		return "", fmt.Errorf("create runtime codex dir for %q: %w", resolved.Role.Name, err)
	}

	configText := normalizeConfigTOML(resolved.Config.ConfigTOML)
	if err := os.WriteFile(filepath.Join(codexDir, configFilename), []byte(configText), 0644); err != nil {
		return "", fmt.Errorf("write config.toml for %q: %w", resolved.Role.Name, err)
	}

	authBytes, err := normalizeAuthJSON(resolved.Config.AuthJSON)
	if err != nil {
		return "", fmt.Errorf("normalize auth.json for %q: %w", resolved.Role.Name, err)
	}
	if err := os.WriteFile(filepath.Join(codexDir, authFilename), authBytes, 0600); err != nil {
		return "", fmt.Errorf("write auth.json for %q: %w", resolved.Role.Name, err)
	}
	return roleHome, nil
}

func HostContainerRuntimeRoot(projectRoot, workspaceID string) string {
	return filepath.Join(projectRoot, ".runtime", "container-codex", sanitizeRolePath(workspaceID))
}

func HostContainerCodexDir(projectRoot, workspaceID, roleName string) string {
	return WorkspaceCodexDir(HostContainerRuntimeRoot(projectRoot, workspaceID), roleName)
}

func HostLeaderRuntimeRoot(projectRoot, workspaceID string) string {
	return filepath.Join(projectRoot, ".runtime", "leader-codex", sanitizeRolePath(workspaceID))
}

func HostLeaderHomeDir(projectRoot, workspaceID, roleName string) string {
	return filepath.Join(HostLeaderRuntimeRoot(projectRoot, workspaceID), sanitizeRolePath(roleName))
}

func HostLeaderCodexDir(projectRoot, workspaceID, roleName string) string {
	return filepath.Join(HostLeaderHomeDir(projectRoot, workspaceID, roleName), ".codex")
}

func sanitizeRolePath(value string) string {
	value = strings.TrimSpace(value)
	if value == "" {
		return "role"
	}
	replacer := strings.NewReplacer(
		"/", "-",
		"\\", "-",
		":", "-",
		"*", "-",
		"?", "-",
		"\"", "-",
		"<", "-",
		">", "-",
		"|", "-",
		" ", "-",
	)
	value = replacer.Replace(value)
	value = strings.Trim(value, ".-")
	if value == "" {
		return "role"
	}
	return value
}

func normalizeConfigTOML(value string) string {
	return strings.TrimSpace(value)
}

func normalizeAuthJSON(value string) ([]byte, error) {
	value = strings.TrimSpace(value)
	if value == "" {
		value = "{}"
	}
	if !json.Valid([]byte(value)) {
		return nil, fmt.Errorf("invalid json")
	}

	var decoded any
	if err := json.Unmarshal([]byte(value), &decoded); err != nil {
		return nil, err
	}
	return json.MarshalIndent(decoded, "", "  ")
}

func writeResolvedRoleSkills(root string, resolved runtimeconfig.ResolvedRole) error {
	if len(resolved.Skills) == 0 {
		return nil
	}
	codexDir := filepath.Join(root, sanitizeRolePath(resolved.Role.Name), ".codex")
	skillsRoot := filepath.Join(codexDir, "skills")
	for _, item := range resolved.Skills {
		skillKey := strings.TrimSpace(item.Skill.SkillKey)
		if skillKey == "" {
			skillKey = sanitizeRolePath(item.Skill.ID)
		}
		if skillKey == "" {
			return fmt.Errorf("resolved skill key is required")
		}
		targetDir := filepath.Join(skillsRoot, sanitizeRolePath(skillKey))
		if err := os.MkdirAll(targetDir, 0755); err != nil {
			return fmt.Errorf("create skill dir %s: %w", targetDir, err)
		}
		skillBody := strings.TrimSpace(item.Skill.ContentMarkdown)
		if skillBody == "" {
			return fmt.Errorf("skill %q content_markdown is required", skillKey)
		}
		if err := os.WriteFile(filepath.Join(targetDir, "SKILL.md"), []byte(skillBody), 0644); err != nil {
			return fmt.Errorf("write SKILL.md for %q: %w", skillKey, err)
		}
	}
	return nil
}