package workspaceruntime

import (
	"context"
	"path/filepath"
	"strings"

	"inbox/internal/app/lanegit"
	"inbox/internal/app/runtimecodex"
	"inbox/internal/app/runtimeconfig"
	"inbox/internal/base/slug"
	"inbox/internal/base/timeutil"
	"inbox/internal/domain/lane"
	"inbox/internal/domain/role"
	"inbox/internal/domain/skill"
	"inbox/internal/domain/workspace"
)

type store interface {
	GetProject(context.Context, string) (workspace.Project, error)
	UpdateProjectDefaultBranch(context.Context, string, string) error
	GetWorkspace(context.Context, string) (workspace.Workspace, error)
	UpdateWorkspace(context.Context, workspace.Workspace) error
	GetLane(context.Context, string) (lane.Record, error)
	UpdateLane(context.Context, lane.Record) (lane.Record, error)
}

type runtimeCodexStore interface {
	store
	ListRoles(context.Context) ([]role.Definition, error)
	GetRole(context.Context, string) (role.Definition, error)
	GetRoleConfig(context.Context, string) (role.Config, error)
	ListRolePrompts(context.Context, string) ([]role.Prompt, error)
	ListRoleSkillBindings(context.Context, string) ([]role.SkillBinding, error)
	ListSkillsByIDs(context.Context, []string) (map[string]skill.Definition, error)
}

type Service struct {
	store         store
	projectRoot   string
	clock         timeutil.Clock
	workspacesDir string
	git           *gitWorktreeManager
	worker        *hostLaneWorkerBinary
	inbox         *hostInboxBinary
	codexHomes    *runtimecodex.Materializer
	runtime       *containerRuntime
}

type Runtime struct {
	ContainerName  string `json:"container_name"`
	ContainerState string `json:"container_state"`
	WorktreePath   string `json:"worktree_path"`
	RunnerEndpoint string `json:"runner_endpoint"`
	Ensured        bool   `json:"ensured"`
}

func NewService(store store, projectRoot, workspacesDir string, serverPort int, clock timeutil.Clock, runner lanegit.Runner) *Service {
	if clock == nil {
		clock = timeutil.SystemClock{}
	}
	if runner == nil {
		runner = lanegit.ExecRunner{}
	}
	root := strings.TrimSpace(projectRoot)
	probe := newEndpointProbe()
	var codexHomes *runtimecodex.Materializer
	if configStore, ok := store.(runtimeCodexStore); ok {
		codexHomes = runtimecodex.NewMaterializer(
			configStore,
			runtimeconfig.NewService(configStore, configStore, clock),
		)
	}
	return &Service{
		store:         store,
		projectRoot:   root,
		clock:         clock,
		workspacesDir: strings.TrimSpace(workspacesDir),
		git:           &gitWorktreeManager{projectRoot: root, runner: runner},
		worker:        &hostLaneWorkerBinary{projectRoot: root, runner: runner},
		inbox:         &hostInboxBinary{projectRoot: root, runner: runner},
		codexHomes:    codexHomes,
		runtime:       &containerRuntime{projectRoot: root, serverPort: serverPort, runner: runner, probe: probe},
	}
}

func (s *Service) EnsureRepository(ctx context.Context, projectDir string) (string, error) {
	return s.git.ensureRepository(ctx, projectDir)
}

func (s *Service) Ensure(ctx context.Context, workspaceID string) (workspace.Workspace, Runtime, error) {
	ws, err := s.store.GetWorkspace(ctx, strings.TrimSpace(workspaceID))
	if err != nil {
		return workspace.Workspace{}, Runtime{}, err
	}
	project, err := s.store.GetProject(ctx, ws.ProjectID)
	if err != nil {
		return workspace.Workspace{}, Runtime{}, err
	}
	baseBranch, err := s.git.ensureRepository(ctx, project.RootPath)
	if err != nil {
		_, _ = s.failWorkspace(ctx, ws, err)
		return ws, Runtime{}, err
	}
	if project.DefaultBranch != baseBranch {
		if err := s.store.UpdateProjectDefaultBranch(ctx, project.ID, baseBranch); err != nil {
			return ws, Runtime{}, err
		}
		project.DefaultBranch = baseBranch
	}
	if strings.TrimSpace(s.workspacesDir) != "" {
		ws.RootPath = filepath.Join(s.workspacesDir, ws.Slug)
	}
	ws = workspace.ApplyManagedRuntimeConfig(ws, s.workspacesDir, baseBranch)
	return s.ensureWorkspaceHost(ctx, project, ws)
}

func (s *Service) ensureWorkspaceHost(ctx context.Context, project workspace.Project, ws workspace.Workspace) (workspace.Workspace, Runtime, error) {
	runtime := Runtime{
		ContainerName: "",
		WorktreePath:  ws.RootPath,
	}
	if err := s.git.ensureWorktree(ctx, project.RootPath, ws.RootPath, ws.BaseBranch, ws.WorktreeBranch); err != nil {
		failed, _ := s.failWorkspace(ctx, ws, err)
		return failed, runtime, err
	}
	now := timeutil.FormatRFC3339(s.clock.Now())
	ws.RootPath = filepath.Clean(ws.RootPath)
	ws.RuntimeBackend = "host"
	ws.ProvisionState = "ready"
	ws.ProvisionError = ""
	ws.LastProvisionedAt = now
	ws.ContainerState = ""
	if err := s.store.UpdateWorkspace(ctx, ws); err != nil {
		return ws, runtime, err
	}
	runtime.ContainerState = ""
	runtime.RunnerEndpoint = ""
	runtime.Ensured = true
	return ws, runtime, nil
}

func (s *Service) failWorkspace(ctx context.Context, ws workspace.Workspace, cause error) (workspace.Workspace, error) {
	ws.ProvisionState = "failed"
	ws.ProvisionError = strings.TrimSpace(cause.Error())
	ws.ContainerState = "missing"
	if err := s.store.UpdateWorkspace(ctx, ws); err != nil {
		return ws, err
	}
	return ws, cause
}

func (s *Service) EnsureLane(ctx context.Context, laneID string) (lane.Record, error) {
	item, err := s.store.GetLane(ctx, strings.TrimSpace(laneID))
	if err != nil {
		return lane.Record{}, err
	}
	ws, err := s.store.GetWorkspace(ctx, item.WorkspaceID)
	if err != nil {
		return lane.Record{}, err
	}
	project, err := s.store.GetProject(ctx, ws.ProjectID)
	if err != nil {
		return lane.Record{}, err
	}
	baseBranch, err := s.git.ensureRepository(ctx, project.RootPath)
	if err != nil {
		return lane.Record{}, err
	}
	if ws, _, err = s.ensureWorkspaceHost(ctx, project, ws); err != nil {
		return lane.Record{}, err
	}
	if item.BaseBranch == "" {
		item.BaseBranch = firstNonEmpty(strings.TrimSpace(ws.BaseBranch), baseBranch)
	}
	if item.Slug == "" {
		item.Slug = slug.Normalize(item.Name)
	}
	if item.BranchName == "" {
		item.BranchName = lane.DefaultBranchName(ws.Slug, item.TopicID, item.Slug)
	}
	if item.WorktreePath == "" {
		item.WorktreePath = lane.DefaultWorktreePath(ws.RootPath, ws.Slug, item.TopicID, item.Slug)
	}
	if item.ContainerName == "" {
		item.ContainerName = lane.DefaultContainerName(ws.Slug, item.TopicID, item.Slug)
	}
	if err := s.git.ensureWorktree(ctx, project.RootPath, item.WorktreePath, item.BaseBranch, item.BranchName); err != nil {
		return lane.Record{}, err
	}
	workerCodexDir := ""
	if s.codexHomes != nil {
		runtimeRoot := runtimecodex.HostContainerRuntimeRoot(s.projectRoot, ws.ID)
		if err := s.codexHomes.Sync(ctx, ws.ID, runtimeRoot); err != nil {
			return lane.Record{}, err
		}
		workerCodexDir = runtimecodex.HostContainerCodexDir(s.projectRoot, ws.ID, "worker")
	}
	workerBinary, err := s.worker.ensure(ctx)
	if err != nil {
		return lane.Record{}, err
	}
	inboxBinary, err := s.inbox.ensure(ctx)
	if err != nil {
		return lane.Record{}, err
	}
	if err := s.runtime.ensureRunnerImage(ctx); err != nil {
		return lane.Record{}, err
	}
	endpoint, err := s.runtime.ensureLaneContainer(ctx, ws, item, workerBinary, inboxBinary, workerCodexDir)
	if err != nil {
		return lane.Record{}, err
	}
	item.RuntimeEndpoint = endpoint
	item.Status = lane.StatusRunning
	now := timeutil.FormatRFC3339(s.clock.Now())
	if item.StartedAt == "" {
		item.StartedAt = now
	}
	item.UpdatedAt = now
	return s.store.UpdateLane(ctx, item)
}

func (s *Service) StopLane(ctx context.Context, laneID string) (lane.Record, error) {
	item, err := s.store.GetLane(ctx, strings.TrimSpace(laneID))
	if err != nil {
		return lane.Record{}, err
	}
	if item.ContainerName != "" {
		if err := s.runtime.stopContainer(ctx, item.ContainerName); err != nil {
			return lane.Record{}, err
		}
	}
	item.Status = lane.StatusCancelled
	item.CompletedAt = timeutil.FormatRFC3339(s.clock.Now())
	item.RuntimeEndpoint = ""
	return s.store.UpdateLane(ctx, item)
}

func (s *Service) ReleaseLaneRuntime(ctx context.Context, laneID string) (lane.Record, error) {
	item, err := s.store.GetLane(ctx, strings.TrimSpace(laneID))
	if err != nil {
		return lane.Record{}, err
	}
	if item.ContainerName != "" {
		if err := s.runtime.stopContainer(ctx, item.ContainerName); err != nil {
			return lane.Record{}, err
		}
	}
	item.RuntimeEndpoint = ""
	item.UpdatedAt = timeutil.FormatRFC3339(s.clock.Now())
	return s.store.UpdateLane(ctx, item)
}

func firstNonEmpty(values ...string) string {
	for _, value := range values {
		if strings.TrimSpace(value) != "" {
			return value
		}
	}
	return ""
}