"""
Менеджер базы данных SQLite: папки, файлы, метаданные, теги, избранное.
"""

import sqlite3
import logging
from pathlib import Path
from typing import Optional, List, Dict, Any
from contextlib import contextmanager

from comfy_studio.db.schema import PRAGMA_FOREIGN_KEYS, CREATE_TABLES_SQL, CREATE_INDEXES_SQL

logger = logging.getLogger(__name__)


def _normalize(path: str) -> str:
    return str(Path(path).resolve().as_posix())


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

    # ────────────────────────────────
    # Папки
    # ────────────────────────────────

    def add_folder(self, folder_path: str, parent_id: Optional[int] = None) -> Optional[int]:
        if not folder_path:
            return None
        normalized_path = _normalize(folder_path)
        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 = _normalize(folder_path)
        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}: {e}")
            return False

    # ────────────────────────────────
    # Файлы
    # ────────────────────────────────

    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 = _normalize(filepath)
        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 = _normalize(filepath)
        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}: {e}")
            return False

    # ────────────────────────────────
    # Метаданные
    # ────────────────────────────────

    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 сохранения метаданных файла ID {file_id}: {e}")
            return False

    # ────────────────────────────────
    # Выборки
    # ────────────────────────────────

    def get_files_in_folder(self, folder_path: str, search_query: str = "",
                            favorites_only: bool = False,
                            tag: Optional[str] = None) -> List[Dict[str, Any]]:
        """Файлы папки с фильтрами: поиск, избранное, тег."""
        normalized_path = _normalize(folder_path)
        sql = """
            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 = ?
        """
        params: List[Any] = [normalized_path]

        if search_query:
            like = f"%{search_query}%"
            sql += " AND (f.filename LIKE ? OR m.positive_prompt LIKE ? OR m.negative_prompt LIKE ?)"
            params.extend([like, like, like])

        if favorites_only:
            sql += " AND f.favorite = 1"

        if tag:
            sql += """ AND f.id IN (
                SELECT ft.file_id FROM file_tags ft
                JOIN tags t ON ft.tag_id = t.id WHERE t.name = ?
            )"""
            params.append(tag)

        sql += " ORDER BY f.filename ASC"
        try:
            with self._get_connection() as conn:
                cursor = conn.cursor()
                cursor.execute(sql, params)
                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()
                if not row:
                    return None
                details = dict(row)
                details["tags"] = self.get_file_tags(file_id)
                return details
        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 сохранения правок для файла ID {file_id}: {e}")
            return False

    def update_json_field(self, file_id: int, field: str, json_text: Optional[str]) -> bool:
        """Обновляет workflow_json или prompt_json файла.
        При изменении prompt_json перечитывает производные параметры генерации."""
        if field not in ("workflow_json", "prompt_json"):
            logger.error(f"Недопустимое JSON-поле: {field}")
            return False
        try:
            with self._get_connection() as conn:
                cursor = conn.cursor()
                # Гарантируем существование строки metadata
                cursor.execute(
                    "INSERT OR IGNORE INTO metadata (file_id) VALUES (?)", (file_id,))
                cursor.execute(
                    f"UPDATE metadata SET {field} = ? WHERE file_id = ?",
                    (json_text or None, file_id)
                )
                if field == "prompt_json":
                    # Пересчитываем параметры из нового prompt-графа
                    from comfy_studio.parsers.metadata_parser import MetadataParser
                    params = MetadataParser.parse_comfy_parameters(json_text)
                    cursor.execute(
                        """
                        UPDATE metadata SET
                            positive_prompt = ?, negative_prompt = ?, seed = ?,
                            model_name = ?, sampler = ?, steps = ?, cfg = ?
                        WHERE file_id = ?
                        """,
                        (
                            params["positive_prompt"], params["negative_prompt"],
                            params["seed"], params["model_name"], params["sampler"],
                            params["steps"], params["cfg"], file_id
                        )
                    )
                conn.commit()
                return True
        except sqlite3.Error as e:
            logger.error(f"Ошибка сохранения {field} для файла ID {file_id}: {e}")
            return False

    # ────────────────────────────────
    # Избранное
    # ────────────────────────────────

    def set_favorite(self, file_id: int, favorite: bool) -> bool:
        try:
            with self._get_connection() as conn:
                cursor = conn.cursor()
                cursor.execute("UPDATE files SET favorite = ? WHERE id = ?",
                               (1 if favorite else 0, file_id))
                conn.commit()
                return cursor.rowcount > 0
        except sqlite3.Error as e:
            logger.error(f"Ошибка изменения избранного для ID {file_id}: {e}")
            return False

    # ────────────────────────────────
    # Теги
    # ────────────────────────────────

    def add_tag_to_file(self, file_id: int, tag_name: str) -> bool:
        tag_name = tag_name.strip().lower()
        if not tag_name:
            return False
        try:
            with self._get_connection() as conn:
                cursor = conn.cursor()
                cursor.execute("INSERT OR IGNORE INTO tags (name) VALUES (?)", (tag_name,))
                cursor.execute("SELECT id FROM tags WHERE name = ?", (tag_name,))
                tag_id = cursor.fetchone()[0]
                cursor.execute(
                    "INSERT OR IGNORE INTO file_tags (file_id, tag_id) VALUES (?, ?)",
                    (file_id, tag_id)
                )
                conn.commit()
                return True
        except sqlite3.Error as e:
            logger.error(f"Ошибка добавления тега '{tag_name}' к файлу ID {file_id}: {e}")
            return False

    def remove_tag_from_file(self, file_id: int, tag_name: str) -> bool:
        try:
            with self._get_connection() as conn:
                cursor = conn.cursor()
                cursor.execute(
                    """
                    DELETE FROM file_tags WHERE file_id = ?
                      AND tag_id = (SELECT id FROM tags WHERE name = ?)
                    """,
                    (file_id, tag_name.strip().lower())
                )
                # Подчищаем теги-сироты
                cursor.execute(
                    "DELETE FROM tags WHERE id NOT IN (SELECT DISTINCT tag_id FROM file_tags)"
                )
                conn.commit()
                return True
        except sqlite3.Error as e:
            logger.error(f"Ошибка удаления тега '{tag_name}' у файла ID {file_id}: {e}")
            return False

    def get_file_tags(self, file_id: int) -> List[str]:
        try:
            with self._get_connection() as conn:
                cursor = conn.cursor()
                cursor.execute(
                    """
                    SELECT t.name FROM tags t
                    JOIN file_tags ft ON t.id = ft.tag_id
                    WHERE ft.file_id = ? ORDER BY t.name
                    """,
                    (file_id,)
                )
                return [row[0] for row in cursor.fetchall()]
        except sqlite3.Error as e:
            logger.error(f"Ошибка получения тегов файла ID {file_id}: {e}")
            return []

    def get_all_tags(self) -> List[str]:
        try:
            with self._get_connection() as conn:
                cursor = conn.cursor()
                cursor.execute("SELECT name FROM tags ORDER BY name")
                return [row[0] for row in cursor.fetchall()]
        except sqlite3.Error as e:
            logger.error(f"Ошибка получения списка тегов: {e}")
            return []