#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
SQLite storage module - local database for config and accounts
"""

import sqlite3
import json
import os
from pathlib import Path
from typing import TYPE_CHECKING, List, Optional
from contextlib import contextmanager

if TYPE_CHECKING:
    from config import AppConfig, AccountConfig


def _get_db_path() -> Path:
    """Get database file path"""
    from config import DATA_DIR
    return DATA_DIR / "zsglpt.db"


@contextmanager
def get_connection():
    """Get database connection with context manager"""
    db_path = _get_db_path()
    db_path.parent.mkdir(parents=True, exist_ok=True)

    conn = sqlite3.connect(str(db_path))
    conn.row_factory = sqlite3.Row
    try:
        yield conn
        conn.commit()
    except Exception:
        conn.rollback()
        raise
    finally:
        conn.close()


def init_database():
    """Initialize database tables"""
    with get_connection() as conn:
        cursor = conn.cursor()

        # Accounts table
        cursor.execute('''
            CREATE TABLE IF NOT EXISTS accounts (
                id INTEGER PRIMARY KEY AUTOINCREMENT,
                username TEXT NOT NULL UNIQUE,
                password TEXT NOT NULL,
                remark TEXT DEFAULT '',
                enabled INTEGER DEFAULT 1,
                created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
                updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
            )
        ''')

        # Settings table (key-value store)
        cursor.execute('''
            CREATE TABLE IF NOT EXISTS settings (
                key TEXT PRIMARY KEY,
                value TEXT NOT NULL,
                updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
            )
        ''')

        # Create index
        cursor.execute('''
            CREATE INDEX IF NOT EXISTS idx_accounts_username ON accounts(username)
        ''')


def _ensure_db():
    """Ensure database is initialized"""
    db_path = _get_db_path()
    if not db_path.exists():
        init_database()


# ==================== Account Operations ====================

def get_all_accounts() -> List[dict]:
    """Get all accounts from database"""
    _ensure_db()
    with get_connection() as conn:
        cursor = conn.cursor()
        cursor.execute('SELECT * FROM accounts ORDER BY id')
        rows = cursor.fetchall()
        return [dict(row) for row in rows]


def get_account_by_username(username: str) -> Optional[dict]:
    """Get account by username"""
    _ensure_db()
    with get_connection() as conn:
        cursor = conn.cursor()
        cursor.execute('SELECT * FROM accounts WHERE username = ?', (username,))
        row = cursor.fetchone()
        return dict(row) if row else None


def add_account(username: str, password: str, remark: str = '', enabled: bool = True) -> int:
    """Add new account, returns account id"""
    _ensure_db()
    with get_connection() as conn:
        cursor = conn.cursor()
        cursor.execute('''
            INSERT INTO accounts (username, password, remark, enabled)
            VALUES (?, ?, ?, ?)
        ''', (username, password, remark, 1 if enabled else 0))
        return cursor.lastrowid


def update_account(account_id: int, username: str, password: str, remark: str, enabled: bool):
    """Update existing account"""
    _ensure_db()
    with get_connection() as conn:
        cursor = conn.cursor()
        cursor.execute('''
            UPDATE accounts
            SET username = ?, password = ?, remark = ?, enabled = ?, updated_at = CURRENT_TIMESTAMP
            WHERE id = ?
        ''', (username, password, remark, 1 if enabled else 0, account_id))


def delete_account(account_id: int):
    """Delete account by id"""
    _ensure_db()
    with get_connection() as conn:
        cursor = conn.cursor()
        cursor.execute('DELETE FROM accounts WHERE id = ?', (account_id,))


def delete_account_by_username(username: str):
    """Delete account by username"""
    _ensure_db()
    with get_connection() as conn:
        cursor = conn.cursor()
        cursor.execute('DELETE FROM accounts WHERE username = ?', (username,))


# ==================== Settings Operations ====================

def get_setting(key: str, default: str = '') -> str:
    """Get setting value by key"""
    _ensure_db()
    with get_connection() as conn:
        cursor = conn.cursor()
        cursor.execute('SELECT value FROM settings WHERE key = ?', (key,))
        row = cursor.fetchone()
        return row['value'] if row else default


def set_setting(key: str, value: str):
    """Set setting value"""
    _ensure_db()
    with get_connection() as conn:
        cursor = conn.cursor()
        cursor.execute('''
            INSERT OR REPLACE INTO settings (key, value, updated_at)
            VALUES (?, ?, CURRENT_TIMESTAMP)
        ''', (key, value))


def get_all_settings() -> dict:
    """Get all settings as dictionary"""
    _ensure_db()
    with get_connection() as conn:
        cursor = conn.cursor()
        cursor.execute('SELECT key, value FROM settings')
        rows = cursor.fetchall()
        return {row['key']: row['value'] for row in rows}


# ==================== Config Bridge (compatibility with existing code) ====================

def load_config() -> "AppConfig":
    """
    Load config from SQLite database
    Returns AppConfig object for compatibility
    """
    from config import AppConfig, AccountConfig, KDocsConfig, ScreenshotConfig, ProxyConfig, ZSGLConfig, SCREENSHOTS_DIR

    _ensure_db()

    config = AppConfig()

    # Load accounts
    accounts = get_all_accounts()
    config.accounts = [
        AccountConfig(
            username=a['username'],
            password=a['password'],
            remark=a['remark'] or '',
            enabled=bool(a['enabled'])
        ) for a in accounts
    ]

    # Load settings
    settings = get_all_settings()

    # KDocs config - 默认文档链接
    DEFAULT_KDOCS_URL = 'https://kdocs.cn/l/cpwEOo5ynKX4'
    config.kdocs = KDocsConfig(
        enabled=settings.get('kdocs_enabled', 'false').lower() == 'true',
        doc_url=settings.get('kdocs_doc_url', '') or DEFAULT_KDOCS_URL,  # 空字符串也用默认值
        sheet_name=settings.get('kdocs_sheet_name', 'Sheet1'),
        sheet_index=int(settings.get('kdocs_sheet_index', '0')),
        unit_column=settings.get('kdocs_unit_column', 'A'),
        image_column=settings.get('kdocs_image_column', 'D'),
        unit=settings.get('kdocs_unit', ''),
        name_column=settings.get('kdocs_name_column', 'C'),
        row_start=int(settings.get('kdocs_row_start', '0')),
        row_end=int(settings.get('kdocs_row_end', '0')),
    )

    # Screenshot config
    config.screenshot = ScreenshotConfig(
        dir=settings.get('screenshot_dir', str(SCREENSHOTS_DIR)),
        quality=int(settings.get('screenshot_quality', '95')),
        width=int(settings.get('screenshot_width', '1920')),
        height=int(settings.get('screenshot_height', '1080')),
        js_delay_ms=int(settings.get('screenshot_js_delay_ms', '3000')),
        timeout_seconds=int(settings.get('screenshot_timeout_seconds', '60')),
        wkhtmltoimage_path=settings.get('screenshot_wkhtmltoimage_path', ''),
    )

    # Proxy config
    config.proxy = ProxyConfig(
        enabled=settings.get('proxy_enabled', 'false').lower() == 'true',
        server=settings.get('proxy_server', ''),
    )

    # ZSGL config
    config.zsgl = ZSGLConfig(
        base_url=settings.get('zsgl_base_url', 'https://postoa.aidunsoft.com'),
        login_url=settings.get('zsgl_login_url', 'https://postoa.aidunsoft.com/admin/login.aspx'),
        index_url_pattern=settings.get('zsgl_index_url_pattern', 'index.aspx'),
    )

    # Theme
    config.theme = settings.get('theme', 'light')

    return config


def save_config(config: "AppConfig") -> bool:
    """
    Save config to SQLite database
    """
    _ensure_db()

    try:
        with get_connection() as conn:
            cursor = conn.cursor()

            # Save accounts - first get existing accounts
            existing_usernames = set()
            cursor.execute('SELECT username FROM accounts')
            for row in cursor.fetchall():
                existing_usernames.add(row['username'])

            # Update or insert accounts
            config_usernames = set()
            for account in config.accounts:
                config_usernames.add(account.username)

                if account.username in existing_usernames:
                    # Update existing
                    cursor.execute('''
                        UPDATE accounts
                        SET password = ?, remark = ?, enabled = ?, updated_at = CURRENT_TIMESTAMP
                        WHERE username = ?
                    ''', (account.password, account.remark, 1 if account.enabled else 0, account.username))
                else:
                    # Insert new
                    cursor.execute('''
                        INSERT INTO accounts (username, password, remark, enabled)
                        VALUES (?, ?, ?, ?)
                    ''', (account.username, account.password, account.remark, 1 if account.enabled else 0))

            # Delete removed accounts
            removed = existing_usernames - config_usernames
            for username in removed:
                cursor.execute('DELETE FROM accounts WHERE username = ?', (username,))

            # Save settings
            settings_to_save = {
                # KDocs
                'kdocs_enabled': str(config.kdocs.enabled).lower(),
                'kdocs_doc_url': config.kdocs.doc_url,
                'kdocs_sheet_name': config.kdocs.sheet_name,
                'kdocs_sheet_index': str(config.kdocs.sheet_index),
                'kdocs_unit_column': config.kdocs.unit_column,
                'kdocs_image_column': config.kdocs.image_column,
                'kdocs_unit': config.kdocs.unit,
                'kdocs_name_column': config.kdocs.name_column,
                'kdocs_row_start': str(config.kdocs.row_start),
                'kdocs_row_end': str(config.kdocs.row_end),

                # Screenshot
                'screenshot_dir': config.screenshot.dir,
                'screenshot_quality': str(config.screenshot.quality),
                'screenshot_width': str(config.screenshot.width),
                'screenshot_height': str(config.screenshot.height),
                'screenshot_js_delay_ms': str(config.screenshot.js_delay_ms),
                'screenshot_timeout_seconds': str(config.screenshot.timeout_seconds),
                'screenshot_wkhtmltoimage_path': config.screenshot.wkhtmltoimage_path,

                # Proxy
                'proxy_enabled': str(config.proxy.enabled).lower(),
                'proxy_server': config.proxy.server,

                # ZSGL
                'zsgl_base_url': config.zsgl.base_url,
                'zsgl_login_url': config.zsgl.login_url,
                'zsgl_index_url_pattern': config.zsgl.index_url_pattern,

                # Theme
                'theme': config.theme,
            }

            for key, value in settings_to_save.items():
                cursor.execute('''
                    INSERT OR REPLACE INTO settings (key, value, updated_at)
                    VALUES (?, ?, CURRENT_TIMESTAMP)
                ''', (key, value))

        return True
    except Exception as e:
        print(f"[Error] Save config failed: {e}")
        return False


def backup_config() -> bool:
    """Backup database file"""
    db_path = _get_db_path()

    if not db_path.exists():
        return False

    backup_path = db_path.with_suffix('.db.bak')

    try:
        import shutil
        shutil.copy2(db_path, backup_path)
        return True
    except IOError as e:
        print(f"[Error] Backup failed: {e}")
        return False


def restore_config() -> bool:
    """Restore database from backup"""
    db_path = _get_db_path()
    backup_path = db_path.with_suffix('.db.bak')

    if not backup_path.exists():
        return False

    try:
        import shutil
        shutil.copy2(backup_path, db_path)
        return True
    except IOError as e:
        print(f"[Error] Restore failed: {e}")
        return False


def migrate_from_json():
    """Migrate data from old JSON config to SQLite"""
    from config import CONFIG_FILE

    if not CONFIG_FILE.exists():
        return False

    try:
        with open(CONFIG_FILE, 'r', encoding='utf-8') as f:
            data = json.load(f)

        # Load using old format
        from config import AppConfig
        old_config = AppConfig.from_dict(data)

        # Save to SQLite
        save_config(old_config)

        # Rename old file
        backup = CONFIG_FILE.with_suffix('.json.migrated')
        CONFIG_FILE.rename(backup)

        print(f"[Info] Migrated from JSON to SQLite, old file renamed to {backup}")
        return True
    except Exception as e:
        print(f"[Error] Migration failed: {e}")
        return False