package store

import (
	"context"
	"database/sql"
	"fmt"
	"time"

	"provisioning/internal/model"
)

type Images struct {
	DB *sql.DB
}

func (s *Images) Create(ctx context.Context, img model.Image) (int64, error) {
	res, err := s.DB.ExecContext(ctx, `
		INSERT INTO images(name, kind, version, kernel_path, initrd_path, is_default)
		VALUES(?,?,?,?,?,?)
	`, img.Name, img.Kind, img.Version, img.KernelPath, img.InitrdPath, boolToInt(img.IsDefault))
	if err != nil {
		return 0, fmt.Errorf("insert image: %w", err)
	}
	return res.LastInsertId()
}

func (s *Images) List(ctx context.Context) ([]model.Image, error) {
	rows, err := s.DB.QueryContext(ctx, `SELECT id, name, kind, version, kernel_path, initrd_path, is_default, created_at FROM images ORDER BY name`)
	if err != nil {
		return nil, fmt.Errorf("list images: %w", err)
	}
	defer rows.Close()
	var out []model.Image
	for rows.Next() {
		var img model.Image
		var isDefault int
		var createdAt string
		if err := rows.Scan(&img.ID, &img.Name, &img.Kind, &img.Version, &img.KernelPath, &img.InitrdPath, &isDefault, &createdAt); err != nil {
			return nil, fmt.Errorf("scan image: %w", err)
		}
		img.IsDefault = isDefault == 1
		img.CreatedAt, _ = time.Parse(time.RFC3339, createdAt)
		out = append(out, img)
	}
	return out, rows.Err()
}

func (s *Images) GetDefault(ctx context.Context) (*model.Image, error) {
	row := s.DB.QueryRowContext(ctx, `SELECT id, name, kind, version, kernel_path, initrd_path, is_default, created_at FROM images WHERE is_default = 1 LIMIT 1`)
	var img model.Image
	var isDefault int
	var createdAt string
	if err := row.Scan(&img.ID, &img.Name, &img.Kind, &img.Version, &img.KernelPath, &img.InitrdPath, &isDefault, &createdAt); err != nil {
		if err == sql.ErrNoRows {
			return nil, ErrNotFound
		}
		return nil, fmt.Errorf("get default image: %w", err)
	}
	img.IsDefault = true
	img.CreatedAt, _ = time.Parse(time.RFC3339, createdAt)
	return &img, nil
}

func (s *Images) Get(ctx context.Context, id int64) (*model.Image, error) {
	row := s.DB.QueryRowContext(ctx, `SELECT id, name, kind, version, kernel_path, initrd_path, is_default, created_at FROM images WHERE id = ?`, id)
	var img model.Image
	var isDefault int
	var createdAt string
	if err := row.Scan(&img.ID, &img.Name, &img.Kind, &img.Version, &img.KernelPath, &img.InitrdPath, &isDefault, &createdAt); err != nil {
		if err == sql.ErrNoRows {
			return nil, ErrNotFound
		}
		return nil, fmt.Errorf("get image: %w", err)
	}
	img.IsDefault = isDefault == 1
	img.CreatedAt, _ = time.Parse(time.RFC3339, createdAt)
	return &img, nil
}

func (s *Images) SetDefault(ctx context.Context, id int64) error {
	tx, err := s.DB.BeginTx(ctx, nil)
	if err != nil {
		return err
	}
	if _, err := tx.ExecContext(ctx, `UPDATE images SET is_default = 0`); err != nil {
		_ = tx.Rollback()
		return err
	}
	if _, err := tx.ExecContext(ctx, `UPDATE images SET is_default = 1 WHERE id = ?`, id); err != nil {
		_ = tx.Rollback()
		return err
	}
	return tx.Commit()
}

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