"""百度搜索源 — 通过百度千帆官方 API"""

import json
import time
import requests
from providers.base import BaseProvider, SearchResult


class BaiduProvider(BaseProvider):
    name = 'baidu'
    display_name = '百度搜索'
    needs_api_key = True
    enabled = True
    priority = 10  # auto 模式首选

    def __init__(self, config: dict, mode='web'):
        """
        mode: 'web' → 网页搜索（快速）
              'intelligent' → 智能检索生成（AI 分析）
        """
        super().__init__(config)
        self._mode = mode
        if mode == 'intelligent':
            self.name = 'baidu-intelligent'
            self.display_name = '百度智能检索'
            self.priority = 21
            self.enabled = False  # 仅手动选择，不参与 auto

        bc = config.get('baidu', {})
        self.api_key = bc.get('api_key')
        self.intelligent_url = bc.get(
            'intelligent_url',
            'https://qianfan.baidubce.com/v2/ai_search/chat/completions',
        )
        self.web_search_url = bc.get(
            'web_search_url',
            'https://qianfan.baidubce.com/v2/ai_search/web_search',
        )

    def is_available(self) -> bool:
        return bool(self.api_key)

    def search(self, query: str, max_results: int = 10) -> list:
        if not self.api_key:
            return []

        if self._mode == 'intelligent':
            # 智能检索按引用条数扣费，限制最多3条省额度
            return self._intelligent_search(query, min(max_results, 3))
        return self._web_search(query, max_results)

    def _intelligent_search(self, query: str, max_results: int) -> list:
        """智能检索生成 — 返回 AI 回答 + 引用来源"""
        headers = {
            'Authorization': f'Bearer {self.api_key}',
            'Content-Type': 'application/json',
        }
        payload = {
            'messages': [{'content': query, 'role': 'user'}],
            'stream': False,
            'model': 'ernie-4.5-turbo-128k',
            'enable_corner_markers': True,
            'enable_deep_search': True,
        }

        try:
            resp = requests.post(
                self.intelligent_url,
                json=payload,
                headers=headers,
                timeout=60,
            )
            if resp.status_code != 200:
                return []

            data = resp.json()
            results = []

            # 从引用来源中提取搜索结果
            references = data.get('references', []) or data.get('result', {}).get('references', [])
            for ref in references[:max_results]:
                title = ref.get('title', '') or ref.get('name', '')
                url = ref.get('url', '') or ref.get('link', '')
                content = ref.get('summary', '') or ref.get('content', '') or ref.get('snippet', '')
                if title and url:
                    results.append(SearchResult(
                        title=title,
                        url=url,
                        content=content,
                        score=0.8,
                        source=self.name,
                    ))

            # 如果没有引用链接，尝试从 AI 回答的 content 中提取
            if not results:
                ai_content = ''
                try:
                    ai_content = data['choices'][0]['message']['content']
                except (KeyError, IndexError):
                    ai_content = data.get('result', {}).get('answer', '')

                if ai_content:
                    # 作为 AI 搜索结果展示
                    results.append(SearchResult(
                        title=f'百度AI: {query}',
                        url=f'https://www.baidu.com/s?wd={query}',
                        content=ai_content[:500],
                        score=0.7,
                        source=self.name,
                    ))

            return results

        except requests.exceptions.RequestException:
            return []

    def _web_search(self, query: str, max_results: int) -> list:
        """百度网页搜索 API"""
        if max_results <= 0:
            return []

        headers = {
            'Authorization': f'Bearer {self.api_key}',
            'Content-Type': 'application/json',
        }
        payload = {
            'messages': [{'content': query, 'role': 'user'}],
            'search_source': 'baidu_search_v2',
            'resource_type_filter': [{'type': 'web', 'top_k': max_results}],
        }

        try:
            resp = requests.post(
                self.web_search_url,
                json=payload,
                headers=headers,
                timeout=25,
            )
            if resp.status_code != 200:
                return []

            data = resp.json()
            results = []

            # 响应格式: {"request_id":"...", "references":[...]}
            refs = data.get('references', []) or data.get('result', {}).get('items', [])

            for ref in refs[:max_results]:
                title = ref.get('title', '') or ref.get('name', '')
                url = ref.get('url', '') or ref.get('link', '')
                # snippet 是简短摘要，content 是完整内容
                snippet = ref.get('snippet', '') or ref.get('content', '') or ''
                published = ref.get('date', '') or ref.get('published_date', '')

                if title and url:
                    results.append(SearchResult(
                        title=title,
                        url=url,
                        content=snippet[:500] if len(snippet) > 500 else snippet,
                        score=0.6,
                        source=self.name,
                        published_date=published,
                    ))

            return results

        except requests.exceptions.RequestException:
            return []