package db

import (
	"database/sql"
	"fmt"
)

func scanStorageConfig(row interface {
	Scan(dest ...any) error
}) (StorageConfig, error) {
	var c StorageConfig
	var cleanMacos, removeSource, inplace int
	var createdAt string
	if err := row.Scan(
		&c.ID,
		&c.MoverSource,
		&c.MoverDest,
		&cleanMacos,
		&removeSource,
		&inplace,
		&c.MoverRsyncOptions,
		&c.SnapraidContent,
		&c.SnapraidDataDirs,
		&c.SnapraidParityDir,
		&c.SnapraidScrubPlan,
		&createdAt,
	); err != nil {
		return StorageConfig{}, err
	}
	c.MoverCleanMacOS = cleanMacos != 0
	c.MoverRemoveSource = removeSource != 0
	c.MoverInplace = inplace != 0
	c.UpdatedAt = createdAt
	return c, nil
}

func (d *DB) GetStorageConfig() (StorageConfig, error) {
	row := d.conn.QueryRow(`SELECT id, mover_source, mover_dest, mover_clean_macos, mover_remove_source, mover_inplace, mover_rsync_options, snapraid_content, snapraid_data_dirs, snapraid_parity_dir, snapraid_scrub_plan, updated_at FROM storage_config WHERE id = 1`)
	c, err := scanStorageConfig(row)
	if err == sql.ErrNoRows {
		return StorageConfig{ID: 1, MoverCleanMacOS: true, MoverRemoveSource: true, MoverInplace: true, SnapraidScrubPlan: 8}, nil
	}
	if err != nil {
		return StorageConfig{}, fmt.Errorf("get storage config: %w", err)
	}
	return c, nil
}

func (d *DB) UpdateStorageConfig(c StorageConfig) error {
	_, err := d.conn.Exec(`
		UPDATE storage_config
		SET mover_source=?, mover_dest=?, mover_clean_macos=?, mover_remove_source=?, mover_inplace=?,
		    mover_rsync_options=?, snapraid_content=?, snapraid_data_dirs=?, snapraid_parity_dir=?,
		    snapraid_scrub_plan=?, updated_at=datetime('now')
		WHERE id=1`,
		c.MoverSource, c.MoverDest, toInt(c.MoverCleanMacOS), toInt(c.MoverRemoveSource), toInt(c.MoverInplace),
		c.MoverRsyncOptions, c.SnapraidContent, c.SnapraidDataDirs, c.SnapraidParityDir,
		c.SnapraidScrubPlan, c.ID,
	)
	if err != nil {
		return fmt.Errorf("update storage config: %w", err)
	}
	return nil
}

func (d *DB) EnsureStorageConfig() error {
	_, err := d.conn.Exec(`INSERT OR IGNORE INTO storage_config (id) VALUES (1)`)
	if err != nil {
		return fmt.Errorf("ensure storage config: %w", err)
	}
	return nil
}

func scanStorageJob(row interface {
	Scan(dest ...any) error
}) (StorageJob, error) {
	var j StorageJob
	var startedAt, finishedAt sql.NullString
	if err := row.Scan(
		&j.ID, &j.Kind, &j.Status, &j.ArgsJSON, &j.PID,
		&startedAt, &finishedAt, &j.ExitCode, &j.Output, &j.Error, &j.CreatedAt,
	); err != nil {
		return StorageJob{}, err
	}
	if startedAt.Valid {
		j.StartedAt = &startedAt.String
	}
	if finishedAt.Valid {
		j.FinishedAt = &finishedAt.String
	}
	return j, nil
}

func (d *DB) CreateStorageJob(kind string, argsJSON string) (StorageJob, error) {
	result, err := d.conn.Exec(
		`INSERT INTO storage_jobs (kind, status, args_json) VALUES (?, 'queued', ?)`,
		kind, argsJSON,
	)
	if err != nil {
		return StorageJob{}, fmt.Errorf("create storage job: %w", err)
	}
	id, err := result.LastInsertId()
	if err != nil {
		return StorageJob{}, fmt.Errorf("last insert id: %w", err)
	}
	return d.GetStorageJob(id)
}

func (d *DB) GetStorageJob(id int64) (StorageJob, error) {
	row := d.conn.QueryRow(`
		SELECT id, kind, status, args_json, pid, started_at, finished_at, exit_code, output, error, created_at
		FROM storage_jobs WHERE id=?`, id)
	j, err := scanStorageJob(row)
	if err == sql.ErrNoRows {
		return StorageJob{}, fmt.Errorf("storage job not found")
	}
	if err != nil {
		return StorageJob{}, fmt.Errorf("get storage job: %w", err)
	}
	return j, nil
}

func (d *DB) MarkJobRunning(id int64, pid int) error {
	_, err := d.conn.Exec(
		`UPDATE storage_jobs SET status='running', pid=?, started_at=datetime('now') WHERE id=?`,
		pid, id,
	)
	if err != nil {
		return fmt.Errorf("mark job running: %w", err)
	}
	return nil
}

func (d *DB) MarkJobFinished(id int64, status string, exitCode int, output, errMsg string) error {
	_, err := d.conn.Exec(
		`UPDATE storage_jobs SET status=?, exit_code=?, output=?, error=?, finished_at=datetime('now') WHERE id=?`,
		status, exitCode, output, errMsg, id,
	)
	if err != nil {
		return fmt.Errorf("mark job finished: %w", err)
	}
	return nil
}

func (d *DB) AppendJobOutput(id int64, line string) error {
	_, err := d.conn.Exec(
		`UPDATE storage_jobs SET output = output || ? || char(10) WHERE id=?`,
		line, id,
	)
	if err != nil {
		return fmt.Errorf("append job output: %w", err)
	}
	return nil
}

func (d *DB) TrimJobOutput(id int64, maxLines int) error {
	_ = maxLines
	return nil
}

func (d *DB) ListStorageJobs(limit int) ([]StorageJob, error) {
	if limit <= 0 {
		limit = 50
	}
	rows, err := d.conn.Query(`
		SELECT id, kind, status, args_json, pid, started_at, finished_at, exit_code, output, error, created_at
		FROM storage_jobs ORDER BY created_at DESC LIMIT ?`, limit)
	if err != nil {
		return nil, fmt.Errorf("list storage jobs: %w", err)
	}
	defer rows.Close()

	jobs := make([]StorageJob, 0)
	for rows.Next() {
		j, err := scanStorageJob(rows)
		if err != nil {
			return nil, fmt.Errorf("scan storage job: %w", err)
		}
		jobs = append(jobs, j)
	}
	return jobs, rows.Err()
}

func (d *DB) GetRunningJob() (*StorageJob, error) {
	row := d.conn.QueryRow(`
		SELECT id, kind, status, args_json, pid, started_at, finished_at, exit_code, output, error, created_at
		FROM storage_jobs WHERE status IN ('queued','running') ORDER BY created_at ASC LIMIT 1`)
	j, err := scanStorageJob(row)
	if err == sql.ErrNoRows {
		return nil, nil
	}
	if err != nil {
		return nil, fmt.Errorf("get running job: %w", err)
	}
	return &j, nil
}

func (d *DB) ResetOrphanedJobs() error {
	_, err := d.conn.Exec(
		`UPDATE storage_jobs SET status='interrupted', finished_at=datetime('now') WHERE status IN ('queued','running')`,
	)
	if err != nil {
		return fmt.Errorf("reset orphaned jobs: %w", err)
	}
	return nil
}

func (d *DB) SetJobCancelled(id int64) error {
	_, err := d.conn.Exec(
		`UPDATE storage_jobs SET status='cancelled', finished_at=datetime('now') WHERE id=?`,
		id,
	)
	if err != nil {
		return fmt.Errorf("set job cancelled: %w", err)
	}
	return nil
}

func toInt(b bool) int {
	if b {
		return 1
	}
	return 0
}