import json
import re
from typing import Any
from typing import Dict, List

import aiohttp
from tenacity import AsyncRetrying

from app.infra.internal import DecodeServer
from app.infra.shared.tools import request_retry

from ._const import DecodeTaskConst


class DecodeTaskUtil(DecodeTaskConst):
    decode_server = DecodeServer()

    def prepare_extract_body(self, article: Dict) -> Dict:
        return {
            "scene": self.BusinessScene.POINT_PICK,
            "content_type": self.ContentType.LONG_ARTICLE,
            "content": {
                "channel_content_id": article.get("wx_sn", ""),
                "video_url": "",
                "images": article.get("article_images"),
                "body_text": article.get("article_text", ""),
                "title": article.get("article_title", ""),
                "channel_account_id": article.get("gh_id", ""),
                "channel_account_name": article.get("account_name", ""),
            },
        }

    @staticmethod
    def extract_decode_result(result: Dict) -> Dict:
        """
        从结构的结果中，解析出灵感点、目的点、关键点；
        """
        final_result = result.get("final_normalization_rebuild")
        if not final_result:
            return {"error": "解构结果中无 final_normalization_rebuild 信息"}
        # 灵感点
        inspiration_list = final_result.get("inspiration_final_result", {}).get(
            "最终灵感点列表", []
        )
        # 目的
        purpose_list = final_result.get("purpose_final_result", {}).get(
            "最终目的点列表", []
        )
        # 关键点
        keypoint_list = final_result.get("keypoint_final", {}).get("最终关键点列表", [])

        topic_fusion = final_result.get("topic_fusion_result", {})
        # 选题
        topic_text = (
            topic_fusion.get("最终选题", {}).get("选题", "")
            if isinstance(topic_fusion.get("最终选题"), dict)
            else ""
        )

        def _join_points(items: list, key: str) -> str:
            parts = [str(p[key]) for p in items if isinstance(p, dict) and p.get(key)]
            return ",".join(parts)

        return {
            "inspiration": _join_points(inspiration_list, "灵感点"),
            "purpose": _join_points(purpose_list, "目的点"),
            "key_point": _join_points(keypoint_list, "关键点"),
            "topic": topic_text,
        }

    async def fetch_decode_result(self, task_id: str):
        return await self.decode_server.fetch_result(task_id)


class AdPlatformArticlesDecodeUtils(DecodeTaskUtil):
    @staticmethod
    def format_images(images: str) -> List[str]:
        """
        格式化图片字符串，空/非法 JSON 返回空列表。
        """
        if not images or not images.strip():
            return []
        try:
            image_list = json.loads(images)
        except (json.JSONDecodeError, TypeError):
            return []
        if not isinstance(image_list, list):
            return []
        return [
            i.get("image_url")
            for i in image_list
            if isinstance(i, dict) and i.get("image_url")
        ]

    async def create_decode_task(self, article: Dict):
        images = self.format_images(article.get("article_images") or "")
        article["article_images"] = images
        request_body = self.prepare_extract_body(article)
        return await self.decode_server.create_decode_task(request_body)


class InnerArticlesDecodeUtils(DecodeTaskUtil):
    RETRYABLE_EXCEPTIONS = (aiohttp.ClientError, TimeoutError)

    @staticmethod
    def extract_body_text_and_images(raw_text):
        """
        从文本中提取图片和正文
        """
        if not raw_text:
            return "", []

        image_pattern = re.compile(r"^\[image:\s*(https?://[^\]]+)\s*\]$")
        body_lines = []
        images = []

        for line in raw_text.splitlines():
            stripped_line = line.strip()
            if not stripped_line:
                if body_lines and body_lines[-1] != "":
                    body_lines.append("")
                continue

            match = image_pattern.match(stripped_line)
            if match:
                images.append(match.group(1).strip())
                continue

            body_lines.append(stripped_line)

        while body_lines and body_lines[-1] == "":
            body_lines.pop()

        body_text = "\n".join(body_lines)
        return body_text, images


    async def create_decode_task(self, payload):
        request_body = {
            "scene": self.BusinessScene.POINT_PICK,
            "content_type": payload["content_type"],
            "content": {
                "channel_content_id": payload.get("channel_content_id", ""),
                "video_url": "",
                "images": payload.get("images", []),
                "body_text": payload.get("body_text", ""),
                "title": payload.get("title", ""),
                "channel_account_id": payload.get("gh_id", ""),
                "channel_account_name": payload.get("account_name", ""),
            },
        }
        return await self.decode_server.create_decode_task(request_body)

    async def create_decode_task_with_retry(
        self,
        payload: Dict[str, Any],
        retry_times: int,
        min_retry_delay: int = 1,
        max_retry_delay: int = 4,
    ):
        retry_kwargs = request_retry(
            retry_times=retry_times,
            min_retry_delay=min_retry_delay,
            max_retry_delay=max_retry_delay,
        )
        async for attempt in AsyncRetrying(**retry_kwargs):
            with attempt:
                return await self.create_decode_task(payload)


__all__ = [
    "AdPlatformArticlesDecodeUtils",
    "InnerArticlesDecodeUtils",
    "DecodeTaskUtil",
]