"""
OCR任务表添加新字段迁移脚本
添加字段：thumbnail_url（缩略图URL）、bill（消费金额）、model（使用模型）
运行: python -m scripts.migrate_ocr_add_fields
"""
import os
import sys
from pathlib import Path

sys.path.insert(0, str(Path(__file__).parent.parent))

from dotenv import load_dotenv
load_dotenv()

import psycopg2
from psycopg2.extensions import ISOLATION_LEVEL_AUTOCOMMIT


def get_db_connection():
    """获取数据库连接"""
    return psycopg2.connect(
        host=os.getenv('DB_HOST', 'localhost'),
        port=os.getenv('DB_PORT', '5432'),
        user=os.getenv('DB_USER', 'postgres'),
        password=os.getenv('DB_PASSWORD', ''),
        database=os.getenv('DB_NAME', 'model_square')
    )


def table_exists(cursor):
    """检查表是否存在"""
    cursor.execute("""
        SELECT EXISTS (
            SELECT FROM information_schema.tables 
            WHERE table_schema = 'aigcspace' 
            AND table_name = 'ocr_tasks'
        );
    """)
    return cursor.fetchone()[0]


def column_exists(cursor, column_name):
    """检查列是否存在"""
    cursor.execute("""
        SELECT EXISTS (
            SELECT FROM information_schema.columns 
            WHERE table_schema = 'aigcspace' 
            AND table_name = 'ocr_tasks'
            AND column_name = %s
        );
    """, (column_name,))
    return cursor.fetchone()[0]


def migrate():
    """执行迁移"""
    conn = get_db_connection()
    conn.set_isolation_level(ISOLATION_LEVEL_AUTOCOMMIT)
    cursor = conn.cursor()
    
    try:
        if not table_exists(cursor):
            print("❌ 表 aigcspace.ocr_tasks 不存在，请先运行 migrate_ocr.py")
            return
        
        print("开始添加新字段到 OCR 任务表...")
        
        # 添加 thumbnail_url 字段
        if not column_exists(cursor, 'thumbnail_url'):
            cursor.execute("""
                ALTER TABLE aigcspace.ocr_tasks 
                ADD COLUMN thumbnail_url VARCHAR(500);
            """)
            cursor.execute("""
                COMMENT ON COLUMN aigcspace.ocr_tasks.thumbnail_url IS '缩略图URL';
            """)
            print("✓ 添加字段 thumbnail_url")
        else:
            print("✓ 字段 thumbnail_url 已存在")
        
        # 添加 model 字段
        if not column_exists(cursor, 'model'):
            cursor.execute("""
                ALTER TABLE aigcspace.ocr_tasks 
                ADD COLUMN model VARCHAR(100);
            """)
            cursor.execute("""
                COMMENT ON COLUMN aigcspace.ocr_tasks.model IS '使用的OCR模型';
            """)
            print("✓ 添加字段 model")
        else:
            print("✓ 字段 model 已存在")
        
        # 添加 input_tokens 字段
        if not column_exists(cursor, 'input_tokens'):
            cursor.execute("""
                ALTER TABLE aigcspace.ocr_tasks 
                ADD COLUMN input_tokens INTEGER DEFAULT 0;
            """)
            cursor.execute("""
                COMMENT ON COLUMN aigcspace.ocr_tasks.input_tokens IS '输入Token数（图片token）';
            """)
            print("✓ 添加字段 input_tokens")
        else:
            print("✓ 字段 input_tokens 已存在")
        
        # 添加 output_tokens 字段
        if not column_exists(cursor, 'output_tokens'):
            cursor.execute("""
                ALTER TABLE aigcspace.ocr_tasks 
                ADD COLUMN output_tokens INTEGER DEFAULT 0;
            """)
            cursor.execute("""
                COMMENT ON COLUMN aigcspace.ocr_tasks.output_tokens IS '输出Token数（识别文本token）';
            """)
            print("✓ 添加字段 output_tokens")
        else:
            print("✓ 字段 output_tokens 已存在")
        
        # 添加 bill 字段
        if not column_exists(cursor, 'bill'):
            cursor.execute("""
                ALTER TABLE aigcspace.ocr_tasks 
                ADD COLUMN bill NUMERIC(10, 4) DEFAULT 0;
            """)
            cursor.execute("""
                COMMENT ON COLUMN aigcspace.ocr_tasks.bill IS '消费金额（元）';
            """)
            print("✓ 添加字段 bill")
        else:
            print("✓ 字段 bill 已存在")
        
        print("\n✅ OCR任务表字段添加完成！")
        
    except Exception as e:
        print(f"❌ 迁移失败: {e}")
        raise
    finally:
        cursor.close()
        conn.close()


def rollback():
    """回滚迁移"""
    conn = get_db_connection()
    conn.set_isolation_level(ISOLATION_LEVEL_AUTOCOMMIT)
    cursor = conn.cursor()
    
    try:
        if not table_exists(cursor):
            print("✓ 表 aigcspace.ocr_tasks 不存在，无需回滚")
            return
        
        print("开始回滚 OCR 任务表字段...")
        
        # 删除字段
        if column_exists(cursor, 'thumbnail_url'):
            cursor.execute("ALTER TABLE aigcspace.ocr_tasks DROP COLUMN thumbnail_url;")
            print("✓ 删除字段 thumbnail_url")
        
        if column_exists(cursor, 'model'):
            cursor.execute("ALTER TABLE aigcspace.ocr_tasks DROP COLUMN model;")
            print("✓ 删除字段 model")
        
        if column_exists(cursor, 'input_tokens'):
            cursor.execute("ALTER TABLE aigcspace.ocr_tasks DROP COLUMN input_tokens;")
            print("✓ 删除字段 input_tokens")
        
        if column_exists(cursor, 'output_tokens'):
            cursor.execute("ALTER TABLE aigcspace.ocr_tasks DROP COLUMN output_tokens;")
            print("✓ 删除字段 output_tokens")
        
        if column_exists(cursor, 'bill'):
            cursor.execute("ALTER TABLE aigcspace.ocr_tasks DROP COLUMN bill;")
            print("✓ 删除字段 bill")
        
        print("\n✅ OCR任务表字段回滚完成！")
        
    except Exception as e:
        print(f"❌ 回滚失败: {e}")
        raise
    finally:
        cursor.close()
        conn.close()


def status():
    """查看迁移状态"""
    conn = get_db_connection()
    conn.set_isolation_level(ISOLATION_LEVEL_AUTOCOMMIT)
    cursor = conn.cursor()
    
    try:
        if not table_exists(cursor):
            print("❌ 表 aigcspace.ocr_tasks 不存在")
            return
        
        print("OCR任务表字段状态：")
        
        fields = ['thumbnail_url', 'model', 'input_tokens', 'output_tokens', 'bill']
        for field in fields:
            exists = column_exists(cursor, field)
            status_icon = '✓' if exists else '✗'
            print(f"{status_icon} {field}: {'已添加' if exists else '未添加'}")
        
    except Exception as e:
        print(f"❌ 查看状态失败: {e}")
        raise
    finally:
        cursor.close()
        conn.close()


if __name__ == "__main__":
    import argparse
    
    parser = argparse.ArgumentParser(description='OCR任务表字段迁移脚本')
    parser.add_argument('--action', choices=['migrate', 'rollback', 'status'], 
                       default='migrate', help='操作类型')
    args = parser.parse_args()
    
    if args.action == 'migrate':
        migrate()
    elif args.action == 'rollback':
        rollback()
    elif args.action == 'status':
        status()