#!/usr/bin/env python3
# -*- coding: utf-8 -*-

"""
海报生成引擎 V3
使用 poster_v2 模块，支持5种布局和5种主题
"""

import logging
from typing import Dict, Any, Optional, List
import aiohttp
import base64

from .base import BaseAIGCEngine, EngineResult

logger = logging.getLogger(__name__)


class PosterGenerateEngineV3(BaseAIGCEngine):
    """
    海报生成引擎 V3
    
    使用 poster_v2 模块:
    - 5种布局: hero_bottom, overlay_center, overlay_bottom, split_vertical, card_float
    - 5种主题: ocean, sunset, peach, mint, latte
    - 支持真实图片
    """
    
    engine_id = "poster_generate_v3"
    engine_name = "海报生成 V3"
    version = "3.0.0"
    description = "基于小红书风格的海报生成，支持5种布局和5种主题"
    
    def __init__(self):
        super().__init__()
        self._service = None
    
    def get_param_schema(self) -> Dict[str, Any]:
        """定义参数结构"""
        return {
            "layout": {
                "type": "str",
                "required": False,
                "default": "hero_bottom",
                "desc": "布局: hero_bottom, overlay_center, overlay_bottom, split_vertical, card_float",
            },
            "theme": {
                "type": "str",
                "required": False,
                "default": "ocean",
                "desc": "主题: ocean, sunset, peach, mint, latte",
            },
            "content": {
                "type": "object",
                "required": True,
                "desc": "内容 {title, subtitle, price, tags, details, ...}",
            },
            "image_url": {
                "type": "str",
                "required": False,
                "desc": "背景图片 URL",
            },
            "image_path": {
                "type": "str",
                "required": False,
                "desc": "背景图片本地路径",
            },
            "image_base64": {
                "type": "str",
                "required": False,
                "desc": "背景图片 Base64",
            },
            "auto_layout": {
                "type": "bool",
                "required": False,
                "default": False,
                "desc": "是否自动推荐布局",
            },
            "auto_theme": {
                "type": "bool",
                "required": False,
                "default": False,
                "desc": "是否自动推荐主题",
            },
            "category": {
                "type": "str",
                "required": False,
                "desc": "内容分类 (用于自动推荐主题)",
            },
        }
    
    def estimate_duration(self, params: Dict[str, Any]) -> int:
        """预估执行时间"""
        has_image = bool(params.get('image_url') or params.get('image_path') or params.get('image_base64'))
        return 10 if has_image else 5
    
    async def execute(self, params: Dict[str, Any], task_id: str = None) -> EngineResult:
        """执行海报生成"""
        try:
            self.log("开始生成海报 (V3)")
            self.set_progress(task_id, 10)
            
            # 提取参数
            layout = params.get('layout', 'hero_bottom')
            theme = params.get('theme', 'ocean')
            content = params.get('content', {})
            image_url = params.get('image_url')
            image_path = params.get('image_path')
            image_base64 = params.get('image_base64')
            auto_layout = params.get('auto_layout', False)
            auto_theme = params.get('auto_theme', False)
            category = params.get('category')
            
            if not content.get('title'):
                return EngineResult(
                    success=False,
                    error="内容缺少标题",
                    error_code="MISSING_TITLE"
                )
            
            self.set_progress(task_id, 20)
            
            # 获取服务
            service = self._get_service()
            
            # 自动推荐布局/主题
            if auto_layout:
                layout = service.suggest_layout(content)
                self.log(f"自动推荐布局: {layout}")
            
            if auto_theme and category:
                theme = service.suggest_theme(category)
                self.log(f"自动推荐主题: {theme}")
            
            self.set_progress(task_id, 30)
            
            # 下载图片 (如果是 URL)
            final_image_base64 = image_base64
            if image_url and not final_image_base64:
                self.log(f"下载图片: {image_url[:50]}...")
                final_image_base64 = await self._download_image(image_url)
            
            self.set_progress(task_id, 50)
            
            # 生成海报
            result = service.generate(
                layout=layout,
                theme=theme,
                content=content,
                image_base64=final_image_base64,
                image_path=image_path,
            )
            
            self.set_progress(task_id, 90)
            
            if result.get('success'):
                self.set_progress(task_id, 100)
                return EngineResult(
                    success=True,
                    data={
                        "image_base64": result['image_base64'],
                        "images_base64": [result['image_base64']],
                        "layout": result['layout'],
                        "theme": result['theme'],
                    },
                    metadata={
                        "layout": result['layout'],
                        "theme": result['theme'],
                        "has_image": bool(final_image_base64 or image_path),
                    }
                )
            else:
                return EngineResult(
                    success=False,
                    error=result.get('error', '海报生成失败'),
                    error_code="GENERATION_FAILED"
                )
            
        except Exception as e:
            self.log(f"海报生成异常: {e}", level='error')
            return EngineResult(
                success=False,
                error=str(e),
                error_code="EXECUTION_ERROR"
            )
    
    def _get_service(self):
        """获取海报服务"""
        if self._service:
            return self._service
        
        from poster_v2 import get_poster_service_v2
        self._service = get_poster_service_v2()
        return self._service
    
    async def _download_image(self, url: str) -> Optional[str]:
        """从 URL 下载图片并转为 Base64"""
        try:
            async with aiohttp.ClientSession() as session:
                async with session.get(url, timeout=aiohttp.ClientTimeout(total=30)) as response:
                    if response.status == 200:
                        image_bytes = await response.read()
                        return base64.b64encode(image_bytes).decode('utf-8')
                    else:
                        self.log(f"下载图片失败: {url}, 状态码: {response.status}", level='warning')
        except Exception as e:
            self.log(f"下载图片异常: {url}, 错误: {e}", level='warning')
        return None