// Package sdlc provides SDLC-related adapters.
package sdlc

import (
	"context"
	"database/sql"
	"encoding/json"
	"fmt"
	"log/slog"
	"time"

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

// WorkerSDLCExecutor implements port.SDLCExecutor by routing commands through
// the worker pool. Used for skeleton/monorepo projects that don't have a
// dedicated pod.
type WorkerSDLCExecutor struct {
	workQueue port.WorkQueue
	db        *sql.DB
	timeout   time.Duration
	logger    *slog.Logger
}

// WorkerSDLCExecutorConfig configures the worker SDLC executor.
type WorkerSDLCExecutorConfig struct {
	// WorkQueue for enqueueing SDLC tasks.
	WorkQueue port.WorkQueue

	// DB for fetching project git clone URLs.
	DB *sql.DB

	// Timeout is the maximum wait time for task completion (default: 10 minutes).
	Timeout time.Duration

	Logger *slog.Logger
}

// NewWorkerSDLCExecutor creates a new worker-based SDLC executor.
func NewWorkerSDLCExecutor(cfg WorkerSDLCExecutorConfig) *WorkerSDLCExecutor {
	timeout := cfg.Timeout
	if timeout == 0 {
		timeout = 10 * time.Minute
	}
	logger := cfg.Logger
	if logger == nil {
		logger = slog.Default()
	}
	return &WorkerSDLCExecutor{
		workQueue: cfg.WorkQueue,
		db:        cfg.DB,
		timeout:   timeout,
		logger:    logger.With("component", "worker-sdlc-executor"),
	}
}

// getGitCloneURL fetches the HTTP clone URL for a project from the database.
func (e *WorkerSDLCExecutor) getGitCloneURL(ctx context.Context, projectID string) (string, error) {
	if e.db == nil {
		return "", fmt.Errorf("database not configured for worker SDLC executor")
	}
	var gitCloneHTTP sql.NullString
	err := e.db.QueryRowContext(ctx,
		`SELECT git_clone_http FROM projects WHERE id = $1`,
		projectID,
	).Scan(&gitCloneHTTP)
	if err != nil {
		if err == sql.ErrNoRows {
			return "", domain.ErrProjectNotFound
		}
		return "", fmt.Errorf("failed to get project git URL: %w", err)
	}
	if !gitCloneHTTP.Valid || gitCloneHTTP.String == "" {
		return "", fmt.Errorf("project %s has no git clone URL configured", projectID)
	}
	return gitCloneHTTP.String, nil
}

// enqueueAndWait enqueues an SDLC task and waits for completion.
func (e *WorkerSDLCExecutor) enqueueAndWait(ctx context.Context, projectID string, spec domain.SDLCTaskSpec) (string, error) {
	specMap := map[string]any{
		"command":       spec.Command,
		"args":          spec.Args,
		"git_clone_url": spec.GitCloneURL,
		"auto_commit":   spec.AutoCommit,
		"auto_push":     spec.AutoPush,
	}

	task := &domain.WorkTask{
		ProjectID:  projectID,
		Type:       domain.WorkTaskTypeSDLC,
		Spec:       specMap,
		MaxRetries: 1,
	}

	taskID, err := e.workQueue.Enqueue(ctx, task)
	if err != nil {
		return "", fmt.Errorf("failed to enqueue SDLC task: %w", err)
	}

	e.logger.Info("enqueued SDLC task",
		"task_id", taskID,
		"project_id", projectID,
		"command", spec.Command,
	)

	return e.waitForCompletion(ctx, taskID)
}

// waitForCompletion polls the work queue until the task completes or times out.
func (e *WorkerSDLCExecutor) waitForCompletion(ctx context.Context, taskID string) (string, error) {
	deadline := time.Now().Add(e.timeout)
	ticker := time.NewTicker(500 * time.Millisecond)
	defer ticker.Stop()

	for {
		select {
		case <-ctx.Done():
			return "", ctx.Err()
		case <-ticker.C:
			if time.Now().After(deadline) {
				return "", fmt.Errorf("timeout waiting for SDLC task %s", taskID)
			}

			task, err := e.workQueue.GetTask(ctx, taskID)
			if err != nil {
				continue // Task might not exist yet
			}

			switch task.Status {
			case domain.WorkTaskStatusCompleted:
				if task.Result != nil {
					return task.Result.Output, nil
				}
				return "", nil
			case domain.WorkTaskStatusFailed:
				return "", fmt.Errorf("SDLC task failed: %s", task.Error)
			case domain.WorkTaskStatusCancelled:
				return "", fmt.Errorf("SDLC task was cancelled")
			}
			// Still pending or running, continue polling
		}
	}
}

// executeCommand is a helper that builds and executes an SDLC command.
func (e *WorkerSDLCExecutor) executeCommand(ctx context.Context, projectID, command string, args ...string) (string, error) {
	gitURL, err := e.getGitCloneURL(ctx, projectID)
	if err != nil {
		return "", err
	}

	spec := domain.SDLCTaskSpec{
		Command:     command,
		Args:        args,
		GitCloneURL: gitURL,
		AutoCommit:  true,
		AutoPush:    true,
	}

	return e.enqueueAndWait(ctx, projectID, spec)
}

// executeReadOnlyCommand executes an SDLC command that doesn't modify state.
func (e *WorkerSDLCExecutor) executeReadOnlyCommand(ctx context.Context, projectID, command string, args ...string) (string, error) {
	gitURL, err := e.getGitCloneURL(ctx, projectID)
	if err != nil {
		return "", err
	}

	spec := domain.SDLCTaskSpec{
		Command:     command,
		Args:        args,
		GitCloneURL: gitURL,
		AutoCommit:  false,
		AutoPush:    false,
	}

	return e.enqueueAndWait(ctx, projectID, spec)
}

// GetState returns the global SDLC state for a project.
func (e *WorkerSDLCExecutor) GetState(ctx context.Context, projectID string) (*sdlc.State, error) {
	output, err := e.executeReadOnlyCommand(ctx, projectID, "state")
	if err != nil {
		return nil, err
	}
	var state sdlc.State
	if err := json.Unmarshal([]byte(output), &state); err != nil {
		return nil, fmt.Errorf("parse sdlc state: %w", err)
	}
	return &state, nil
}

// GetNext returns the classifier's recommendation for the next action.
func (e *WorkerSDLCExecutor) GetNext(ctx context.Context, projectID, feature string) (*sdlc.Classification, error) {
	args := []string{}
	if feature != "" {
		args = append(args, "--feature", feature)
	}
	output, err := e.executeReadOnlyCommand(ctx, projectID, "next", args...)
	if err != nil {
		return nil, err
	}
	var cl sdlc.Classification
	if err := json.Unmarshal([]byte(output), &cl); err != nil {
		return nil, fmt.Errorf("parse sdlc classification: %w", err)
	}
	return &cl, nil
}

// ListFeatures returns all features in the project.
func (e *WorkerSDLCExecutor) ListFeatures(ctx context.Context, projectID string) ([]*sdlc.Feature, error) {
	output, err := e.executeReadOnlyCommand(ctx, projectID, "feature", "list")
	if err != nil {
		return nil, err
	}
	var features []*sdlc.Feature
	if err := json.Unmarshal([]byte(output), &features); err != nil {
		return nil, fmt.Errorf("parse sdlc features: %w", err)
	}
	return features, nil
}

// GetFeature returns a single feature by slug.
func (e *WorkerSDLCExecutor) GetFeature(ctx context.Context, projectID, slug string) (*sdlc.Feature, error) {
	output, err := e.executeReadOnlyCommand(ctx, projectID, "feature", "show", slug)
	if err != nil {
		return nil, err
	}
	var f sdlc.Feature
	if err := json.Unmarshal([]byte(output), &f); err != nil {
		return nil, fmt.Errorf("parse sdlc feature: %w", err)
	}
	return &f, nil
}

// CreateFeature creates a new feature with the given slug and title.
func (e *WorkerSDLCExecutor) CreateFeature(ctx context.Context, projectID, slug, title string) (*sdlc.Feature, error) {
	output, err := e.executeCommand(ctx, projectID, "feature", "create", slug, "--title", title)
	if err != nil {
		return nil, err
	}
	var f sdlc.Feature
	if err := json.Unmarshal([]byte(output), &f); err != nil {
		return nil, fmt.Errorf("parse sdlc feature: %w", err)
	}
	return &f, nil
}

// TransitionFeature moves a feature to the specified phase.
func (e *WorkerSDLCExecutor) TransitionFeature(ctx context.Context, projectID, slug string, phase sdlc.FeaturePhase) error {
	_, err := e.executeCommand(ctx, projectID, "feature", "transition", slug, string(phase))
	return err
}

// BlockFeature adds a blocker reason to a feature.
func (e *WorkerSDLCExecutor) BlockFeature(ctx context.Context, projectID, slug, reason string) error {
	_, err := e.executeCommand(ctx, projectID, "feature", "block", slug, "--reason", reason)
	return err
}

// UnblockFeature removes all blockers from a feature.
func (e *WorkerSDLCExecutor) UnblockFeature(ctx context.Context, projectID, slug string) error {
	_, err := e.executeCommand(ctx, projectID, "feature", "unblock", slug)
	return err
}

// DeleteFeature removes a feature entirely.
func (e *WorkerSDLCExecutor) DeleteFeature(ctx context.Context, projectID, slug string) error {
	_, err := e.executeCommand(ctx, projectID, "feature", "delete", slug, "--force")
	return err
}

// GetArtifactStatus returns artifact statuses for a feature.
func (e *WorkerSDLCExecutor) GetArtifactStatus(ctx context.Context, projectID, slug string) (map[sdlc.ArtifactType]*sdlc.Artifact, error) {
	output, err := e.executeReadOnlyCommand(ctx, projectID, "artifact", "status", slug)
	if err != nil {
		return nil, err
	}
	var artifacts map[sdlc.ArtifactType]*sdlc.Artifact
	if err := json.Unmarshal([]byte(output), &artifacts); err != nil {
		return nil, fmt.Errorf("parse sdlc artifacts: %w", err)
	}
	return artifacts, nil
}

// ApproveArtifact approves a feature artifact.
func (e *WorkerSDLCExecutor) ApproveArtifact(ctx context.Context, projectID, slug string, artType sdlc.ArtifactType) error {
	_, err := e.executeCommand(ctx, projectID, "artifact", "approve", slug, string(artType))
	return err
}

// RejectArtifact rejects a feature artifact.
func (e *WorkerSDLCExecutor) RejectArtifact(ctx context.Context, projectID, slug string, artType sdlc.ArtifactType) error {
	_, err := e.executeCommand(ctx, projectID, "artifact", "reject", slug, string(artType))
	return err
}

// PassArtifact marks a feature artifact as passed.
func (e *WorkerSDLCExecutor) PassArtifact(ctx context.Context, projectID, slug string, artType sdlc.ArtifactType) error {
	_, err := e.executeCommand(ctx, projectID, "artifact", "pass", slug, string(artType))
	return err
}

// FailArtifact marks a feature artifact as failed.
func (e *WorkerSDLCExecutor) FailArtifact(ctx context.Context, projectID, slug string, artType sdlc.ArtifactType) error {
	_, err := e.executeCommand(ctx, projectID, "artifact", "fail", slug, string(artType))
	return err
}

// NeedsFixArtifact marks a feature artifact as needing fixes.
func (e *WorkerSDLCExecutor) NeedsFixArtifact(ctx context.Context, projectID, slug string, artType sdlc.ArtifactType) error {
	_, err := e.executeCommand(ctx, projectID, "artifact", "needs-fix", slug, string(artType))
	return err
}

// ListTasks returns all tasks for a feature.
func (e *WorkerSDLCExecutor) ListTasks(ctx context.Context, projectID, slug string) ([]sdlc.Task, error) {
	output, err := e.executeReadOnlyCommand(ctx, projectID, "task", "list", slug)
	if err != nil {
		return nil, err
	}
	var tasks []sdlc.Task
	if err := json.Unmarshal([]byte(output), &tasks); err != nil {
		return nil, fmt.Errorf("parse sdlc tasks: %w", err)
	}
	return tasks, nil
}

// AddTask adds a new task to a feature.
func (e *WorkerSDLCExecutor) AddTask(ctx context.Context, projectID, slug, title string) (*sdlc.Task, error) {
	output, err := e.executeCommand(ctx, projectID, "task", "add", slug, "--title", title)
	if err != nil {
		return nil, err
	}
	var t sdlc.Task
	if err := json.Unmarshal([]byte(output), &t); err != nil {
		return nil, fmt.Errorf("parse sdlc task: %w", err)
	}
	return &t, nil
}

// StartTask marks a task as in-progress.
func (e *WorkerSDLCExecutor) StartTask(ctx context.Context, projectID, slug, taskID string) error {
	_, err := e.executeCommand(ctx, projectID, "task", "start", slug, taskID)
	return err
}

// CompleteTask marks a task as complete.
func (e *WorkerSDLCExecutor) CompleteTask(ctx context.Context, projectID, slug, taskID string) error {
	_, err := e.executeCommand(ctx, projectID, "task", "complete", slug, taskID)
	return err
}

// BlockTask marks a task as blocked.
func (e *WorkerSDLCExecutor) BlockTask(ctx context.Context, projectID, slug, taskID string) error {
	_, err := e.executeCommand(ctx, projectID, "task", "block", slug, taskID)
	return err
}

// QueryBlocked returns all blocked features.
func (e *WorkerSDLCExecutor) QueryBlocked(ctx context.Context, projectID string) ([]port.BlockedInfo, error) {
	output, err := e.executeReadOnlyCommand(ctx, projectID, "query", "blocked")
	if err != nil {
		return nil, err
	}
	var blocked []port.BlockedInfo
	if err := json.Unmarshal([]byte(output), &blocked); err != nil {
		return nil, fmt.Errorf("parse sdlc blocked query: %w", err)
	}
	return blocked, nil
}

// QueryReady returns features ready for work.
func (e *WorkerSDLCExecutor) QueryReady(ctx context.Context, projectID string) ([]port.ReadyInfo, error) {
	output, err := e.executeReadOnlyCommand(ctx, projectID, "query", "ready")
	if err != nil {
		return nil, err
	}
	var ready []port.ReadyInfo
	if err := json.Unmarshal([]byte(output), &ready); err != nil {
		return nil, fmt.Errorf("parse sdlc ready query: %w", err)
	}
	return ready, nil
}

// QueryNeedsApproval returns features awaiting approval.
func (e *WorkerSDLCExecutor) QueryNeedsApproval(ctx context.Context, projectID string) ([]port.ApprovalInfo, error) {
	output, err := e.executeReadOnlyCommand(ctx, projectID, "query", "needs-approval")
	if err != nil {
		return nil, err
	}
	var pending []port.ApprovalInfo
	if err := json.Unmarshal([]byte(output), &pending); err != nil {
		return nil, fmt.Errorf("parse sdlc approval query: %w", err)
	}
	return pending, nil
}

// CreateBranch creates a feature branch and its manifest.
func (e *WorkerSDLCExecutor) CreateBranch(ctx context.Context, projectID, slug string) (*sdlc.BranchManifest, error) {
	output, err := e.executeCommand(ctx, projectID, "branch", "create", slug)
	if err != nil {
		return nil, err
	}
	var manifest sdlc.BranchManifest
	if err := json.Unmarshal([]byte(output), &manifest); err != nil {
		return nil, fmt.Errorf("parse sdlc branch manifest: %w", err)
	}
	return &manifest, nil
}

// GetBranchStatus returns the full branch status including checklist.
func (e *WorkerSDLCExecutor) GetBranchStatus(ctx context.Context, projectID, slug string) (*port.BranchStatus, error) {
	output, err := e.executeReadOnlyCommand(ctx, projectID, "branch", "status", slug)
	if err != nil {
		return nil, err
	}
	var result port.BranchStatus
	if err := json.Unmarshal([]byte(output), &result); err != nil {
		return nil, fmt.Errorf("parse sdlc branch status: %w", err)
	}
	return &result, nil
}

// SyncBranch syncs a feature branch with its base branch.
func (e *WorkerSDLCExecutor) SyncBranch(ctx context.Context, projectID, slug string) error {
	_, err := e.executeCommand(ctx, projectID, "branch", "sync", slug)
	return err
}

// MergeFeature merges a feature branch after all gates pass.
func (e *WorkerSDLCExecutor) MergeFeature(ctx context.Context, projectID, slug, strategy string) error {
	args := []string{slug}
	if strategy != "" {
		args = append(args, "--strategy", strategy)
	}
	_, err := e.executeCommand(ctx, projectID, "merge", args...)
	return err
}

// ArchiveFeature archives a released feature.
func (e *WorkerSDLCExecutor) ArchiveFeature(ctx context.Context, projectID, slug string) error {
	_, err := e.executeCommand(ctx, projectID, "archive", slug)
	return err
}

// Compile-time interface check.
var _ port.SDLCExecutor = (*WorkerSDLCExecutor)(nil)