package sqlstore

import (
	"context"
	"database/sql"
	"encoding/json"
	"errors"
	"fmt"
	"path/filepath"
	"strings"
	"sync"
	"time"

	"gitea-codex-bot/internal/config"
	"gitea-codex-bot/internal/domain"
	"gitea-codex-bot/internal/store"

	_ "github.com/go-sql-driver/mysql"
	_ "modernc.org/sqlite"
)

const defaultMaxRetries = 2

var ErrStaleRun = errors.New("review run is no longer current")

type Store struct {
	db        *sql.DB
	dialect   string
	enqueueMu sync.Mutex
}

func Open(settings config.Settings) (*Store, error) {
	dsn := settings.DatabaseURL
	dialect := "mysql"
	if dsn == "" {
		dsn = fmt.Sprintf("%s:%s@tcp(%s:%d)/%s?parseTime=true&charset=utf8mb4", settings.DBUser, settings.DBPassword, settings.DBHost, settings.DBPort, settings.DBName)
	}
	if strings.HasPrefix(dsn, "mysql://") {
		dsn = strings.TrimPrefix(dsn, "mysql://")
	}
	if strings.HasPrefix(dsn, "sqlite://") {
		dialect = "sqlite"
		dsn = strings.TrimPrefix(dsn, "sqlite://")
	} else if strings.HasPrefix(dsn, "sqlite:") {
		dialect = "sqlite"
		dsn = strings.TrimPrefix(dsn, "sqlite:")
	} else if strings.HasPrefix(dsn, "file:") || dsn == ":memory:" || filepath.Ext(dsn) == ".db" {
		dialect = "sqlite"
	}
	if dialect == "mysql" && !strings.Contains(dsn, "parseTime=") {
		if strings.Contains(dsn, "?") {
			dsn += "&parseTime=true"
		} else {
			dsn += "?parseTime=true"
		}
	}
	db, err := sql.Open(map[string]string{"sqlite": "sqlite", "mysql": "mysql"}[dialect], dsn)
	if err != nil {
		return nil, err
	}
	if dialect == "sqlite" {
		// SQLite has one writer and in-memory databases are connection-local.
		db.SetMaxOpenConns(1)
		db.SetMaxIdleConns(1)
	} else {
		db.SetMaxOpenConns(8)
	}
	if err := db.Ping(); err != nil {
		_ = db.Close()
		return nil, err
	}
	return &Store{db: db, dialect: dialect}, nil
}

func (s *Store) Close() error { return s.db.Close() }
func (s *Store) Migrate(ctx context.Context) error {
	stmts := s.schema()
	for _, stmt := range stmts {
		if _, err := s.db.ExecContext(ctx, stmt); err != nil {
			return fmt.Errorf("migration: %w", err)
		}
	}
	if _, err := s.db.ExecContext(ctx, s.alterAddTriggerCommentBody()); err != nil && !strings.Contains(strings.ToLower(err.Error()), "duplicate") && !strings.Contains(strings.ToLower(err.Error()), "exists") {
		return fmt.Errorf("migration trigger_comment_body: %w", err)
	}
	return nil
}
func (s *Store) schema() []string {
	if s.dialect == "sqlite" {
		return []string{
			`CREATE TABLE IF NOT EXISTS webhook_events (id INTEGER PRIMARY KEY AUTOINCREMENT, delivery_id TEXT NULL UNIQUE, event_name TEXT NOT NULL, repo TEXT NOT NULL, comment_id INTEGER NULL, payload_sha256 TEXT NOT NULL, created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP, UNIQUE(repo, comment_id))`,
			`CREATE TABLE IF NOT EXISTS review_jobs (id INTEGER PRIMARY KEY AUTOINCREMENT, repo TEXT NOT NULL, pr_number INTEGER NOT NULL, head_sha TEXT NOT NULL, trigger_comment_id INTEGER NOT NULL, command TEXT NOT NULL, command_args TEXT NULL, requested_by TEXT NOT NULL, status TEXT NOT NULL, last_error TEXT NULL, result_json TEXT NULL, created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP, updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP, started_at TIMESTAMP NULL, finished_at TIMESTAMP NULL, UNIQUE(repo, trigger_comment_id))`,
			`CREATE INDEX IF NOT EXISTS ix_review_jobs_lookup ON review_jobs(repo, pr_number, head_sha, status, created_at)`,
			`CREATE TABLE IF NOT EXISTS review_runs (id INTEGER PRIMARY KEY AUTOINCREMENT, job_id INTEGER NOT NULL, status TEXT NOT NULL, runner_container_id TEXT NULL, result_json TEXT NULL, error_message TEXT NULL, started_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP, finished_at TIMESTAMP NULL, FOREIGN KEY(job_id) REFERENCES review_jobs(id) ON DELETE CASCADE)`,
			`CREATE INDEX IF NOT EXISTS ix_review_runs_job_status ON review_runs(job_id, status)`,
			`CREATE TABLE IF NOT EXISTS bot_comments (id INTEGER PRIMARY KEY AUTOINCREMENT, repo TEXT NOT NULL, pr_number INTEGER NOT NULL, head_sha TEXT NOT NULL, gitea_comment_id INTEGER NOT NULL, marker TEXT NOT NULL, created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP, updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP, UNIQUE(repo, pr_number, marker))`,
			`CREATE INDEX IF NOT EXISTS ix_bot_comments_repo_pr ON bot_comments(repo, pr_number)`,
		}
	}
	return []string{
		`CREATE TABLE IF NOT EXISTS webhook_events (id BIGINT AUTO_INCREMENT PRIMARY KEY, delivery_id VARCHAR(255) NULL UNIQUE, event_name VARCHAR(128) NOT NULL, repo VARCHAR(255) NOT NULL, comment_id BIGINT NULL, payload_sha256 VARCHAR(64) NOT NULL, created_at DATETIME(6) NOT NULL DEFAULT CURRENT_TIMESTAMP(6), UNIQUE KEY uq_webhook_events_repo_comment (repo, comment_id)) ENGINE=InnoDB`,
		`CREATE TABLE IF NOT EXISTS review_jobs (id BIGINT AUTO_INCREMENT PRIMARY KEY, repo VARCHAR(255) NOT NULL, pr_number INT NOT NULL, head_sha VARCHAR(64) NOT NULL, trigger_comment_id BIGINT NOT NULL, command VARCHAR(64) NOT NULL, command_args TEXT NULL, requested_by VARCHAR(255) NOT NULL, status VARCHAR(32) NOT NULL, last_error TEXT NULL, result_json JSON NULL, created_at DATETIME(6) NOT NULL DEFAULT CURRENT_TIMESTAMP(6), updated_at DATETIME(6) NOT NULL DEFAULT CURRENT_TIMESTAMP(6), started_at DATETIME(6) NULL, finished_at DATETIME(6) NULL, UNIQUE KEY uq_review_jobs_repo_trigger_comment (repo, trigger_comment_id), KEY ix_review_jobs_lookup (repo, pr_number, head_sha, status, created_at)) ENGINE=InnoDB`,
		`CREATE TABLE IF NOT EXISTS review_runs (id BIGINT AUTO_INCREMENT PRIMARY KEY, job_id BIGINT NOT NULL, status VARCHAR(32) NOT NULL, runner_container_id VARCHAR(128) NULL, result_json JSON NULL, error_message TEXT NULL, started_at DATETIME(6) NOT NULL DEFAULT CURRENT_TIMESTAMP(6), finished_at DATETIME(6) NULL, CONSTRAINT fk_review_runs_job FOREIGN KEY(job_id) REFERENCES review_jobs(id) ON DELETE CASCADE, KEY ix_review_runs_job_status (job_id, status)) ENGINE=InnoDB`,
		`CREATE TABLE IF NOT EXISTS bot_comments (id BIGINT AUTO_INCREMENT PRIMARY KEY, repo VARCHAR(255) NOT NULL, pr_number INT NOT NULL, head_sha VARCHAR(64) NOT NULL, gitea_comment_id BIGINT NOT NULL, marker VARCHAR(255) NOT NULL, created_at DATETIME(6) NOT NULL DEFAULT CURRENT_TIMESTAMP(6), updated_at DATETIME(6) NOT NULL DEFAULT CURRENT_TIMESTAMP(6), UNIQUE KEY uq_bot_comments_marker (repo, pr_number, marker), KEY ix_bot_comments_repo_pr (repo, pr_number)) ENGINE=InnoDB`,
	}
}
func (s *Store) alterAddTriggerCommentBody() string {
	if s.dialect == "sqlite" {
		return `ALTER TABLE review_jobs ADD COLUMN trigger_comment_body TEXT`
	}
	return `ALTER TABLE review_jobs ADD COLUMN trigger_comment_body TEXT NULL`
}

func (s *Store) InsertWebhookEvent(ctx context.Context, event domain.WebhookEvent) (bool, error) {
	_, err := s.db.ExecContext(ctx, `INSERT INTO webhook_events(delivery_id,event_name,repo,comment_id,payload_sha256) VALUES(?,?,?,?,?)`, nullable(event.DeliveryID), event.EventName, event.Repo, event.CommentID, event.PayloadSHA256)
	if err != nil {
		if isConstraint(err) {
			return false, nil
		}
		return false, err
	}
	return true, nil
}
func (s *Store) CooldownRemaining(ctx context.Context, repo string, pr int, duration time.Duration) (int, error) {
	cutoff := time.Now().UTC().Add(-duration)
	var created time.Time
	err := s.db.QueryRowContext(ctx, `SELECT created_at FROM review_jobs WHERE repo=? AND pr_number=? AND created_at>=? ORDER BY created_at DESC LIMIT 1`, repo, pr, cutoff).Scan(&created)
	if errors.Is(err, sql.ErrNoRows) {
		return 0, nil
	}
	if err != nil {
		return 0, err
	}
	remaining := int((duration - time.Since(created)).Seconds())
	if remaining < 0 {
		return 0, nil
	}
	return remaining, nil
}
func (s *Store) EnqueueJob(ctx context.Context, event domain.WebhookEvent, command domain.ParsedCommand) (domain.Job, error) {
	args, _ := json.Marshal(command.Arguments)
	result, err := s.db.ExecContext(ctx, `INSERT INTO review_jobs(repo,pr_number,head_sha,trigger_comment_id,command,command_args,trigger_comment_body,requested_by,status) VALUES(?,?,?,?,?,?,?,?,?)`, event.Repo, event.PRNumber, event.HeadSHA, event.CommentID, command.Name, string(args), event.CommentBody, event.Sender, domain.JobQueued)
	if err != nil {
		return domain.Job{}, err
	}
	id, err := result.LastInsertId()
	if err != nil {
		return domain.Job{}, err
	}
	return s.getJob(ctx, id)
}

func (s *Store) EnqueueAcceptedJob(ctx context.Context, event domain.WebhookEvent, command domain.ParsedCommand, cooldown time.Duration) (domain.Job, bool, int, error) {
	s.enqueueMu.Lock()
	defer s.enqueueMu.Unlock()
	tx, err := s.db.BeginTx(ctx, nil)
	if err != nil {
		return domain.Job{}, false, 0, err
	}
	defer tx.Rollback()
	_, err = tx.ExecContext(ctx, `INSERT INTO webhook_events(delivery_id,event_name,repo,comment_id,payload_sha256) VALUES(?,?,?,?,?)`, nullable(event.DeliveryID), event.EventName, event.Repo, event.CommentID, event.PayloadSHA256)
	if err != nil {
		if isConstraint(err) {
			return domain.Job{}, false, 0, nil
		}
		return domain.Job{}, false, 0, err
	}
	if command.Name == "review" && cooldown > 0 {
		cutoff := time.Now().UTC().Add(-cooldown)
		query := `SELECT created_at FROM review_jobs WHERE repo=? AND pr_number=? AND created_at>=? ORDER BY created_at DESC LIMIT 1`
		if s.dialect == "mysql" {
			query += ` FOR UPDATE`
		}
		var created time.Time
		if err := tx.QueryRowContext(ctx, query, event.Repo, event.PRNumber, cutoff).Scan(&created); err == nil {
			remaining := int((cooldown - time.Since(created)).Seconds())
			if remaining < 0 {
				remaining = 0
			}
			if err := tx.Commit(); err != nil {
				return domain.Job{}, false, 0, err
			}
			return domain.Job{}, true, remaining, nil
		} else if !errors.Is(err, sql.ErrNoRows) {
			return domain.Job{}, false, 0, err
		}
	}
	args, _ := json.Marshal(command.Arguments)
	result, err := tx.ExecContext(ctx, `INSERT INTO review_jobs(repo,pr_number,head_sha,trigger_comment_id,command,command_args,trigger_comment_body,requested_by,status) VALUES(?,?,?,?,?,?,?,?,?)`, event.Repo, event.PRNumber, event.HeadSHA, event.CommentID, command.Name, string(args), event.CommentBody, event.Sender, domain.JobQueued)
	if err != nil {
		return domain.Job{}, false, 0, err
	}
	id, err := result.LastInsertId()
	if err != nil {
		return domain.Job{}, false, 0, err
	}
	if err := tx.Commit(); err != nil {
		return domain.Job{}, false, 0, err
	}
	job, err := s.getJob(ctx, id)
	return job, true, 0, err
}

func (s *Store) ClaimNextJob(ctx context.Context, now time.Time, lease time.Duration, maxRetries int) (*domain.Job, *domain.ReviewRun, error) {
	if err := s.recoverStale(ctx, now, lease, maxRetries); err != nil {
		return nil, nil, err
	}
	tx, err := s.db.BeginTx(ctx, nil)
	if err != nil {
		return nil, nil, err
	}
	defer tx.Rollback()
	query := `SELECT id FROM review_jobs WHERE status=? ORDER BY created_at ASC,id ASC LIMIT 1`
	if s.dialect == "mysql" {
		query += ` FOR UPDATE SKIP LOCKED`
	}
	var id int64
	if err := tx.QueryRowContext(ctx, query, domain.JobQueued).Scan(&id); err != nil {
		if errors.Is(err, sql.ErrNoRows) {
			return nil, nil, nil
		}
		return nil, nil, err
	}
	started := now.UTC()
	if _, err := tx.ExecContext(ctx, `UPDATE review_jobs SET status=?, started_at=?, finished_at=NULL, updated_at=? WHERE id=?`, domain.JobRunning, started, started, id); err != nil {
		return nil, nil, err
	}
	runRes, err := tx.ExecContext(ctx, `INSERT INTO review_runs(job_id,status,started_at) VALUES(?,?,?)`, id, domain.RunRunning, started)
	if err != nil {
		return nil, nil, err
	}
	runID, err := runRes.LastInsertId()
	if err != nil {
		return nil, nil, err
	}
	if err := tx.Commit(); err != nil {
		return nil, nil, err
	}
	job, err := s.getJob(ctx, id)
	if err != nil {
		return nil, nil, err
	}
	return &job, &domain.ReviewRun{ID: runID, JobID: id, Status: domain.RunRunning, StartedAt: started}, nil
}

func (s *Store) recoverStale(ctx context.Context, now time.Time, lease time.Duration, maxRetries int) error {
	rows, err := s.db.QueryContext(ctx, `SELECT id,started_at FROM review_jobs WHERE status=? AND started_at IS NOT NULL AND started_at<=?`, domain.JobRunning, now.Add(-lease))
	if err != nil {
		return err
	}
	defer rows.Close()
	for rows.Next() {
		var id int64
		var started time.Time
		if err := rows.Scan(&id, &started); err != nil {
			return err
		}
		var attempts int
		if err := s.db.QueryRowContext(ctx, `SELECT COUNT(*) FROM review_runs WHERE job_id=?`, id).Scan(&attempts); err != nil {
			return err
		}
		message := fmt.Sprintf("Job lease timed out after %ds on attempt %d. Recovered by queue watchdog.", int(lease.Seconds()), attempts)
		_, _ = s.db.ExecContext(ctx, `UPDATE review_runs SET status=?,finished_at=?,error_message=? WHERE id=(SELECT id FROM (SELECT id FROM review_runs WHERE job_id=? ORDER BY id DESC LIMIT 1) AS latest) AND status=?`, domain.RunFailed, now, message, id, domain.RunRunning)
		if attempts-1 < maxRetries {
			_, err = s.db.ExecContext(ctx, `UPDATE review_jobs SET status=?,started_at=NULL,finished_at=NULL,last_error=?,updated_at=? WHERE id=?`, domain.JobQueued, message, now, id)
		} else {
			_, err = s.db.ExecContext(ctx, `UPDATE review_jobs SET status=?,finished_at=?,last_error=?,updated_at=? WHERE id=?`, domain.JobFailed, now, message, now, id)
		}
		if err != nil {
			return err
		}
	}
	return rows.Err()
}

func (s *Store) FinishJob(ctx context.Context, jobID, runID int64, success, skipped bool, result *domain.ReviewResult, runErr error) error {
	now := time.Now().UTC()
	status, runStatus := domain.JobFailed, domain.RunFailed
	if skipped {
		status, runStatus = domain.JobSkipped, domain.RunSkipped
	} else if success {
		status, runStatus = domain.JobSucceeded, domain.RunSucceeded
	} else {
		var attempts int
		if err := s.db.QueryRowContext(ctx, `SELECT COUNT(*) FROM review_runs WHERE job_id=?`, jobID).Scan(&attempts); err != nil {
			return err
		}
		if attempts-1 < defaultMaxRetries {
			status = domain.JobQueued
		}
	}
	var resultJSON []byte
	if result != nil {
		resultJSON, _ = json.Marshal(result)
	}
	errText := ""
	if runErr != nil {
		errText = runErr.Error()
	}
	tx, err := s.db.BeginTx(ctx, nil)
	if err != nil {
		return err
	}
	defer tx.Rollback()
	runUpdate, err := tx.ExecContext(ctx, `UPDATE review_runs SET status=?,finished_at=?,error_message=?,result_json=? WHERE id=? AND status=?`, runStatus, now, nullable(errText), nullableBytes(resultJSON), runID, domain.RunRunning)
	if err != nil {
		return err
	}
	if affected, affectedErr := runUpdate.RowsAffected(); affectedErr != nil || affected == 0 {
		return ErrStaleRun
	}
	var jobUpdate sql.Result
	if status == domain.JobQueued {
		jobUpdate, err = tx.ExecContext(ctx, `UPDATE review_jobs SET status=?,started_at=NULL,finished_at=NULL,last_error=?,result_json=?,updated_at=? WHERE id=? AND status=?`, status, nullable(errText), nullableBytes(resultJSON), now, jobID, domain.JobRunning)
	} else {
		jobUpdate, err = tx.ExecContext(ctx, `UPDATE review_jobs SET status=?,finished_at=?,last_error=?,result_json=?,updated_at=? WHERE id=? AND status=?`, status, now, nullable(errText), nullableBytes(resultJSON), now, jobID, domain.JobRunning)
	}
	if err != nil {
		return err
	}
	if affected, affectedErr := jobUpdate.RowsAffected(); affectedErr != nil || affected == 0 {
		return ErrStaleRun
	}
	return tx.Commit()
}

func (s *Store) LatestFailedJob(ctx context.Context) (*domain.Job, error) {
	return s.latest(ctx, `WHERE status=?`, domain.JobFailed)
}
func (s *Store) LatestJob(ctx context.Context) (*domain.Job, error) { return s.latest(ctx, ``, nil) }
func (s *Store) latest(ctx context.Context, where string, arg any) (*domain.Job, error) {
	query := `SELECT id,repo,pr_number,head_sha,trigger_comment_id,COALESCE(trigger_comment_body,''),command,COALESCE(command_args,''),requested_by,status,COALESCE(last_error,''),COALESCE(result_json,''),created_at,updated_at,started_at,finished_at FROM review_jobs ` + where + ` ORDER BY created_at DESC,id DESC LIMIT 1`
	var row *sql.Row
	if arg == nil {
		row = s.db.QueryRowContext(ctx, query)
	} else {
		row = s.db.QueryRowContext(ctx, query, arg)
	}
	job, err := scanJob(row)
	if errors.Is(err, sql.ErrNoRows) {
		return nil, nil
	}
	return &job, err
}
func (s *Store) LatestSuccessfulReview(ctx context.Context, repo string, pr int) (*domain.Job, error) {
	return s.latestWith(ctx, `WHERE repo=? AND pr_number=? AND command IN ('review','rerun') AND status=?`, repo, pr, domain.JobSucceeded)
}
func (s *Store) latestWith(ctx context.Context, where string, args ...any) (*domain.Job, error) {
	query := `SELECT id,repo,pr_number,head_sha,trigger_comment_id,COALESCE(trigger_comment_body,''),command,COALESCE(command_args,''),requested_by,status,COALESCE(last_error,''),COALESCE(result_json,''),created_at,updated_at,started_at,finished_at FROM review_jobs ` + where + ` ORDER BY id DESC LIMIT 1`
	job, err := scanJob(s.db.QueryRowContext(ctx, query, args...))
	if errors.Is(err, sql.ErrNoRows) {
		return nil, nil
	}
	return &job, err
}
func (s *Store) PendingCount(ctx context.Context, repo string, pr int) (int, error) {
	var n int
	err := s.db.QueryRowContext(ctx, `SELECT COUNT(*) FROM review_jobs WHERE repo=? AND pr_number=? AND status IN (?,?)`, repo, pr, domain.JobQueued, domain.JobRunning).Scan(&n)
	return n, err
}
func (s *Store) UpsertBotComment(ctx context.Context, repo string, pr int, marker string, commentID int64, sha string) error {
	if s.dialect == "sqlite" {
		_, err := s.db.ExecContext(ctx, `INSERT INTO bot_comments(repo,pr_number,head_sha,gitea_comment_id,marker) VALUES(?,?,?,?,?) ON CONFLICT(repo,pr_number,marker) DO UPDATE SET head_sha=excluded.head_sha,gitea_comment_id=excluded.gitea_comment_id,updated_at=CURRENT_TIMESTAMP`, repo, pr, sha, commentID, marker)
		return err
	}
	_, err := s.db.ExecContext(ctx, `INSERT INTO bot_comments(repo,pr_number,head_sha,gitea_comment_id,marker) VALUES(?,?,?,?,?) ON DUPLICATE KEY UPDATE head_sha=VALUES(head_sha),gitea_comment_id=VALUES(gitea_comment_id),updated_at=CURRENT_TIMESTAMP(6)`, repo, pr, sha, commentID, marker)
	return err
}
func (s *Store) BotCommentID(ctx context.Context, repo string, pr int, marker string) (int64, error) {
	var id int64
	err := s.db.QueryRowContext(ctx, `SELECT gitea_comment_id FROM bot_comments WHERE repo=? AND pr_number=? AND marker=?`, repo, pr, marker).Scan(&id)
	if errors.Is(err, sql.ErrNoRows) {
		return 0, nil
	}
	return id, err
}

func (s *Store) getJob(ctx context.Context, id int64) (domain.Job, error) {
	return scanJob(s.db.QueryRowContext(ctx, `SELECT id,repo,pr_number,head_sha,trigger_comment_id,COALESCE(trigger_comment_body,''),command,COALESCE(command_args,''),requested_by,status,COALESCE(last_error,''),COALESCE(result_json,''),created_at,updated_at,started_at,finished_at FROM review_jobs WHERE id=?`, id))
}
func scanJob(scanner interface{ Scan(...any) error }) (domain.Job, error) {
	var j domain.Job
	var status string
	var result, body, args, last sql.NullString
	var started, finished sql.NullTime
	if err := scanner.Scan(&j.ID, &j.Repo, &j.PRNumber, &j.HeadSHA, &j.TriggerCommentID, &body, &j.Command, &args, &j.RequestedBy, &status, &last, &result, &j.CreatedAt, &j.UpdatedAt, &started, &finished); err != nil {
		return domain.Job{}, err
	}
	j.TriggerCommentBody = body.String
	j.CommandArgs = args.String
	j.LastError = last.String
	j.ResultJSON = []byte(result.String)
	j.Status = domain.JobStatus(status)
	if started.Valid {
		j.StartedAt = &started.Time
	}
	if finished.Valid {
		j.FinishedAt = &finished.Time
	}
	return j, nil
}
func isConstraint(err error) bool {
	text := strings.ToLower(err.Error())
	return strings.Contains(text, "unique") || strings.Contains(text, "duplicate") || strings.Contains(text, "constraint")
}
func nullable(v string) any {
	if v == "" {
		return nil
	}
	return v
}
func nullableBytes(v []byte) any {
	if len(v) == 0 {
		return nil
	}
	return string(v)
}

var _ store.Store = (*Store)(nil)