# database/db_manager.py
import sqlite3
from pathlib import Path
from typing import Optional, List, Dict, Any
from contextlib import contextmanager

from utils.logger import logger
from database.schema import PRAGMA_FOREIGN_KEYS, CREATE_TABLES_SQL, CREATE_INDEXES_SQL

class DBManager:
    def __init__(self, db_path: str = "comfygallery.db"):
        self.db_path = db_path
        self._initialize_db()

    @contextmanager
    def _get_connection(self):
        conn = None
        try:
            conn = sqlite3.connect(self.db_path)
            conn.execute(PRAGMA_FOREIGN_KEYS)
            conn.row_factory = sqlite3.Row
            yield conn
        except sqlite3.Error as e:
            logger.error(f"Ошибка соединения с БД {self.db_path}: {e}")
            if conn:
                conn.rollback()
            raise
        finally:
            if conn:
                conn.close()

    def _initialize_db(self) -> bool:
        try:
            with self._get_connection() as conn:
                cursor = conn.cursor()
                cursor.executescript(CREATE_TABLES_SQL)
                cursor.executescript(CREATE_INDEXES_SQL)
                conn.commit()
                return True
        except sqlite3.Error as e:
            logger.critical(f"Критическая ошибка инициализации БД: {e}")
            return False

    def add_folder(self, folder_path: str, parent_id: Optional[int] = None) -> Optional[int]:
        if not folder_path:
            return None
        normalized_path = str(Path(folder_path).resolve().as_posix())
        try:
            with self._get_connection() as conn:
                cursor = conn.cursor()
                cursor.execute(
                    "INSERT INTO folders (path, parent_id) VALUES (?, ?) "
                    "ON CONFLICT(path) DO UPDATE SET parent_id=excluded.parent_id RETURNING id",
                    (normalized_path, parent_id)
                )
                result = cursor.fetchone()
                if not result:
                    cursor.execute("SELECT id FROM folders WHERE path = ?", (normalized_path,))
                    result = cursor.fetchone()
                conn.commit()
                return result[0] if result else None
        except sqlite3.Error as e:
            logger.error(f"Ошибка при добавлении папки {normalized_path}: {e}")
            return None

    def remove_folder_by_path(self, folder_path: str) -> bool:
        normalized_path = str(Path(folder_path).resolve().as_posix())
        try:
            with self._get_connection() as conn:
                cursor = conn.cursor()
                cursor.execute("DELETE FROM folders WHERE path = ?", (normalized_path,))
                conn.commit()
                return cursor.rowcount > 0
        except sqlite3.Error as e:
            logger.error(f"Ошибка при удалении папки {normalized_path} из БД: {e}")
            return False

    def register_file(self, folder_id: int, filename: str, filepath: str, size: int, mtime: float) -> Optional[int]:
        if not filename or not filepath:
            return None
        normalized_filepath = str(Path(filepath).resolve().as_posix())
        try:
            with self._get_connection() as conn:
                cursor = conn.cursor()
                cursor.execute(
                    """
                    INSERT INTO files (folder_id, filename, filepath, size, mtime)
                    VALUES (?, ?, ?, ?, ?)
                    ON CONFLICT(filepath) DO UPDATE SET
                        size = excluded.size,
                        mtime = excluded.mtime,
                        folder_id = excluded.folder_id
                    RETURNING id
                    """,
                    (folder_id, filename, normalized_filepath, size, mtime)
                )
                result = cursor.fetchone()
                conn.commit()
                return result[0] if result else None
        except sqlite3.Error as e:
            logger.error(f"Ошибка регистрации файла {normalized_filepath}: {e}")
            return None

    def remove_file_by_path(self, filepath: str) -> bool:
        normalized_filepath = str(Path(filepath).resolve().as_posix())
        try:
            with self._get_connection() as conn:
                cursor = conn.cursor()
                cursor.execute("DELETE FROM files WHERE filepath = ?", (normalized_filepath,))
                conn.commit()
                return cursor.rowcount > 0
        except sqlite3.Error as e:
            logger.error(f"Ошибка удаления файла {normalized_filepath} из БД: {e}")
            return False

    def save_metadata(self, file_id: int, meta_payload: Dict[str, Any]) -> bool:
        try:
            with self._get_connection() as conn:
                cursor = conn.cursor()
                cursor.execute(
                    """
                    INSERT INTO metadata (
                        file_id, prompt_json, workflow_json, positive_prompt, 
                        negative_prompt, seed, model_name, sampler, steps, cfg
                    ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
                    ON CONFLICT(file_id) DO UPDATE SET
                        prompt_json = excluded.prompt_json,
                        workflow_json = excluded.workflow_json,
                        positive_prompt = excluded.positive_prompt,
                        negative_prompt = excluded.negative_prompt,
                        seed = excluded.seed,
                        model_name = excluded.model_name,
                        sampler = excluded.sampler,
                        steps = excluded.steps,
                        cfg = excluded.cfg
                    """,
                    (
                        file_id,
                        meta_payload.get("prompt_json"),
                        meta_payload.get("workflow_json"),
                        meta_payload.get("positive_prompt"),
                        meta_payload.get("negative_prompt"),
                        meta_payload.get("seed"),
                        meta_payload.get("model_name"),
                        meta_payload.get("sampler"),
                        meta_payload.get("steps"),
                        meta_payload.get("cfg")
                    )
                )
                conn.commit()
                return True
        except sqlite3.Error as e:
            logger.error(f"Ошибка при сохранении метаданных файла ID {file_id}: {e}")
            return False

    def get_files_in_folder(self, folder_path: str, search_query: str = "") -> List[Dict[str, Any]]:
        normalized_path = str(Path(folder_path).resolve().as_posix())
        try:
            with self._get_connection() as conn:
                cursor = conn.cursor()
                if search_query:
                    like_query = f"%{search_query}%"
                    cursor.execute(
                        """
                        SELECT f.id, f.filename, f.filepath, f.rating, f.favorite,
                               CASE WHEN m.workflow_json IS NOT NULL AND m.workflow_json != '' THEN 1 ELSE 0 END as has_workflow
                        FROM files f
                        JOIN folders fo ON f.folder_id = fo.id
                        LEFT JOIN metadata m ON f.id = m.file_id
                        WHERE fo.path = ? AND (f.filename LIKE ? OR m.positive_prompt LIKE ? OR m.negative_prompt LIKE ?)
                        ORDER BY f.filename ASC
                        """,
                        (normalized_path, like_query, like_query, like_query)
                    )
                else:
                    cursor.execute(
                        """
                        SELECT f.id, f.filename, f.filepath, f.rating, f.favorite,
                               CASE WHEN m.workflow_json IS NOT NULL AND m.workflow_json != '' THEN 1 ELSE 0 END as has_workflow
                        FROM files f
                        JOIN folders fo ON f.folder_id = fo.id
                        LEFT JOIN metadata m ON f.id = m.file_id
                        WHERE fo.path = ?
                        ORDER BY f.filename ASC
                        """,
                        (normalized_path,)
                    )
                return [dict(row) for row in cursor.fetchall()]
        except sqlite3.Error as e:
            logger.error(f"Ошибка получения файлов в папке {normalized_path}: {e}")
            return []

    def get_file_details(self, file_id: int) -> Optional[Dict[str, Any]]:
        try:
            with self._get_connection() as conn:
                cursor = conn.cursor()
                cursor.execute(
                    """
                    SELECT f.id, f.filename, f.filepath, f.rating, f.favorite,
                           m.prompt_json, m.workflow_json, m.positive_prompt, m.negative_prompt,
                           m.seed, m.model_name, m.sampler, m.steps, m.cfg
                    FROM files f
                    LEFT JOIN metadata m ON f.id = m.file_id
                    WHERE f.id = ?
                    """,
                    (file_id,)
                )
                row = cursor.fetchone()
                return dict(row) if row else None
        except sqlite3.Error as e:
            logger.error(f"Ошибка получения деталей файла ID {file_id}: {e}")
            return None

    def update_file_details(self, file_id: int, positive: str, negative: str, rating: int) -> bool:
        try:
            with self._get_connection() as conn:
                cursor = conn.cursor()
                cursor.execute("UPDATE files SET rating = ? WHERE id = ?", (rating, file_id))
                cursor.execute(
                    """
                    UPDATE metadata 
                    SET positive_prompt = ?, negative_prompt = ?
                    WHERE file_id = ?
                    """,
                    (positive, negative, file_id)
                )
                conn.commit()
                return True
        except sqlite3.Error as e:
            logger.error(f"Ошибка при сохранении правок для файла ID {file_id}: {e}")
            return False