package service

import (
	"context"
	"fmt"
	"log/slog"

	"github.com/orchard9/rdev/internal/domain"
	"github.com/orchard9/rdev/internal/port"
	"github.com/orchard9/rdev/internal/sdlc"
)

// SDLCService provides SDLC operations for projects.
// It resolves project IDs to pod names and delegates to the SDLCExecutor.
type SDLCService struct {
	sdlcExec    port.SDLCExecutor
	projectRepo port.ProjectRepository
	logger      *slog.Logger
}

// SDLCServiceConfig configures the SDLC service.
type SDLCServiceConfig struct {
	Logger *slog.Logger
}

// NewSDLCService creates a new SDLC service.
func NewSDLCService(sdlcExec port.SDLCExecutor, projectRepo port.ProjectRepository, cfg SDLCServiceConfig) *SDLCService {
	logger := cfg.Logger
	if logger == nil {
		logger = slog.Default()
	}
	return &SDLCService{
		sdlcExec:    sdlcExec,
		projectRepo: projectRepo,
		logger:      logger.With("component", "sdlc-service"),
	}
}

// resolveProjectPod looks up a project and returns its pod name.
func (s *SDLCService) resolveProjectPod(ctx context.Context, projectID string) (string, error) {
	project, err := s.projectRepo.Get(ctx, domain.ProjectID(projectID))
	if err != nil {
		return "", domain.ErrProjectNotFound
	}
	if project.PodName == "" {
		return "", fmt.Errorf("project %s has no pod", projectID)
	}
	return project.PodName, nil
}

// GetState returns the global SDLC state for a project.
func (s *SDLCService) GetState(ctx context.Context, projectID string) (*sdlc.State, error) {
	podName, err := s.resolveProjectPod(ctx, projectID)
	if err != nil {
		return nil, err
	}
	return s.sdlcExec.GetState(ctx, podName)
}

// GetNext returns the classifier's recommendation for the next action.
func (s *SDLCService) GetNext(ctx context.Context, projectID, feature string) (*sdlc.Classification, error) {
	podName, err := s.resolveProjectPod(ctx, projectID)
	if err != nil {
		return nil, err
	}
	return s.sdlcExec.GetNext(ctx, podName, feature)
}

// ListFeatures returns all features in a project.
func (s *SDLCService) ListFeatures(ctx context.Context, projectID string) ([]*sdlc.Feature, error) {
	podName, err := s.resolveProjectPod(ctx, projectID)
	if err != nil {
		return nil, err
	}
	return s.sdlcExec.ListFeatures(ctx, podName)
}

// GetFeature returns a single feature by slug.
func (s *SDLCService) GetFeature(ctx context.Context, projectID, slug string) (*sdlc.Feature, error) {
	podName, err := s.resolveProjectPod(ctx, projectID)
	if err != nil {
		return nil, err
	}
	return s.sdlcExec.GetFeature(ctx, podName, slug)
}

// CreateFeature creates a new feature.
func (s *SDLCService) CreateFeature(ctx context.Context, projectID, slug, title string) (*sdlc.Feature, error) {
	podName, err := s.resolveProjectPod(ctx, projectID)
	if err != nil {
		return nil, err
	}
	f, err := s.sdlcExec.CreateFeature(ctx, podName, slug, title)
	if err != nil {
		return nil, err
	}
	s.logger.Info("feature created", "project", projectID, "feature", slug)
	return f, nil
}

// TransitionFeature moves a feature to the specified phase.
func (s *SDLCService) TransitionFeature(ctx context.Context, projectID, slug string, phase sdlc.FeaturePhase) error {
	podName, err := s.resolveProjectPod(ctx, projectID)
	if err != nil {
		return err
	}
	if err := s.sdlcExec.TransitionFeature(ctx, podName, slug, phase); err != nil {
		s.logger.Error("transition feature failed", "project", projectID, "feature", slug, "phase", string(phase), "error", err)
		return err
	}
	s.logger.Info("feature transitioned", "project", projectID, "feature", slug, "phase", string(phase))
	return nil
}

// BlockFeature adds a blocker reason to a feature.
func (s *SDLCService) BlockFeature(ctx context.Context, projectID, slug, reason string) error {
	podName, err := s.resolveProjectPod(ctx, projectID)
	if err != nil {
		return err
	}
	if err := s.sdlcExec.BlockFeature(ctx, podName, slug, reason); err != nil {
		return err
	}
	s.logger.Info("feature blocked", "project", projectID, "feature", slug, "reason", reason)
	return nil
}

// UnblockFeature removes all blockers from a feature.
func (s *SDLCService) UnblockFeature(ctx context.Context, projectID, slug string) error {
	podName, err := s.resolveProjectPod(ctx, projectID)
	if err != nil {
		return err
	}
	if err := s.sdlcExec.UnblockFeature(ctx, podName, slug); err != nil {
		return err
	}
	s.logger.Info("feature unblocked", "project", projectID, "feature", slug)
	return nil
}

// DeleteFeature removes a feature entirely.
func (s *SDLCService) DeleteFeature(ctx context.Context, projectID, slug string) error {
	podName, err := s.resolveProjectPod(ctx, projectID)
	if err != nil {
		return err
	}
	if err := s.sdlcExec.DeleteFeature(ctx, podName, slug); err != nil {
		return err
	}
	s.logger.Info("feature deleted", "project", projectID, "feature", slug)
	return nil
}

// GetArtifactStatus returns artifact statuses for a feature.
func (s *SDLCService) GetArtifactStatus(ctx context.Context, projectID, slug string) (map[sdlc.ArtifactType]*sdlc.Artifact, error) {
	podName, err := s.resolveProjectPod(ctx, projectID)
	if err != nil {
		return nil, err
	}
	return s.sdlcExec.GetArtifactStatus(ctx, podName, slug)
}

// ApproveArtifact approves a feature artifact.
func (s *SDLCService) ApproveArtifact(ctx context.Context, projectID, slug string, artType sdlc.ArtifactType) error {
	podName, err := s.resolveProjectPod(ctx, projectID)
	if err != nil {
		return err
	}
	if err := s.sdlcExec.ApproveArtifact(ctx, podName, slug, artType); err != nil {
		return err
	}
	s.logger.Info("artifact approved", "project", projectID, "feature", slug, "artifact", string(artType))
	return nil
}

// RejectArtifact rejects a feature artifact.
func (s *SDLCService) RejectArtifact(ctx context.Context, projectID, slug string, artType sdlc.ArtifactType) error {
	podName, err := s.resolveProjectPod(ctx, projectID)
	if err != nil {
		return err
	}
	if err := s.sdlcExec.RejectArtifact(ctx, podName, slug, artType); err != nil {
		return err
	}
	s.logger.Info("artifact rejected", "project", projectID, "feature", slug, "artifact", string(artType))
	return nil
}

// ListTasks returns all tasks for a feature.
func (s *SDLCService) ListTasks(ctx context.Context, projectID, slug string) ([]sdlc.Task, error) {
	podName, err := s.resolveProjectPod(ctx, projectID)
	if err != nil {
		return nil, err
	}
	return s.sdlcExec.ListTasks(ctx, podName, slug)
}

// AddTask adds a new task to a feature.
func (s *SDLCService) AddTask(ctx context.Context, projectID, slug, title string) (*sdlc.Task, error) {
	podName, err := s.resolveProjectPod(ctx, projectID)
	if err != nil {
		return nil, err
	}
	return s.sdlcExec.AddTask(ctx, podName, slug, title)
}

// StartTask marks a task as in-progress.
func (s *SDLCService) StartTask(ctx context.Context, projectID, slug, taskID string) error {
	podName, err := s.resolveProjectPod(ctx, projectID)
	if err != nil {
		return err
	}
	return s.sdlcExec.StartTask(ctx, podName, slug, taskID)
}

// CompleteTask marks a task as complete.
func (s *SDLCService) CompleteTask(ctx context.Context, projectID, slug, taskID string) error {
	podName, err := s.resolveProjectPod(ctx, projectID)
	if err != nil {
		return err
	}
	return s.sdlcExec.CompleteTask(ctx, podName, slug, taskID)
}

// BlockTask marks a task as blocked.
func (s *SDLCService) BlockTask(ctx context.Context, projectID, slug, taskID string) error {
	podName, err := s.resolveProjectPod(ctx, projectID)
	if err != nil {
		return err
	}
	return s.sdlcExec.BlockTask(ctx, podName, slug, taskID)
}

// QueryBlocked returns all blocked features in a project.
func (s *SDLCService) QueryBlocked(ctx context.Context, projectID string) ([]port.BlockedInfo, error) {
	podName, err := s.resolveProjectPod(ctx, projectID)
	if err != nil {
		return nil, err
	}
	return s.sdlcExec.QueryBlocked(ctx, podName)
}

// QueryReady returns features ready for work in a project.
func (s *SDLCService) QueryReady(ctx context.Context, projectID string) ([]port.ReadyInfo, error) {
	podName, err := s.resolveProjectPod(ctx, projectID)
	if err != nil {
		return nil, err
	}
	return s.sdlcExec.QueryReady(ctx, podName)
}

// QueryNeedsApproval returns features awaiting approval in a project.
func (s *SDLCService) QueryNeedsApproval(ctx context.Context, projectID string) ([]port.ApprovalInfo, error) {
	podName, err := s.resolveProjectPod(ctx, projectID)
	if err != nil {
		return nil, err
	}
	return s.sdlcExec.QueryNeedsApproval(ctx, podName)
}

// CreateBranch creates a feature branch and its manifest.
func (s *SDLCService) CreateBranch(ctx context.Context, projectID, slug string) (*sdlc.BranchManifest, error) {
	podName, err := s.resolveProjectPod(ctx, projectID)
	if err != nil {
		return nil, err
	}
	m, err := s.sdlcExec.CreateBranch(ctx, podName, slug)
	if err != nil {
		return nil, err
	}
	s.logger.Info("branch created", "project", projectID, "feature", slug, "branch", m.Name)
	return m, nil
}

// GetBranchStatus returns the full branch status including checklist.
func (s *SDLCService) GetBranchStatus(ctx context.Context, projectID, slug string) (*port.BranchStatus, error) {
	podName, err := s.resolveProjectPod(ctx, projectID)
	if err != nil {
		return nil, err
	}
	return s.sdlcExec.GetBranchStatus(ctx, podName, slug)
}

// SyncBranch syncs a feature branch with its base branch.
func (s *SDLCService) SyncBranch(ctx context.Context, projectID, slug string) error {
	podName, err := s.resolveProjectPod(ctx, projectID)
	if err != nil {
		return err
	}
	if err := s.sdlcExec.SyncBranch(ctx, podName, slug); err != nil {
		return err
	}
	s.logger.Info("branch synced", "project", projectID, "feature", slug)
	return nil
}

// MergeFeature merges a feature branch after all gates pass.
func (s *SDLCService) MergeFeature(ctx context.Context, projectID, slug, strategy string) error {
	podName, err := s.resolveProjectPod(ctx, projectID)
	if err != nil {
		return err
	}
	if err := s.sdlcExec.MergeFeature(ctx, podName, slug, strategy); err != nil {
		s.logger.Error("merge feature failed", "project", projectID, "feature", slug, "error", err)
		return err
	}
	s.logger.Info("feature merged", "project", projectID, "feature", slug, "strategy", strategy)
	return nil
}

// ArchiveFeature archives a released feature.
func (s *SDLCService) ArchiveFeature(ctx context.Context, projectID, slug string) error {
	podName, err := s.resolveProjectPod(ctx, projectID)
	if err != nil {
		return err
	}
	if err := s.sdlcExec.ArchiveFeature(ctx, podName, slug); err != nil {
		return err
	}
	s.logger.Info("feature archived", "project", projectID, "feature", slug)
	return nil
}