#!/usr/bin/env python3
"""
从 raw_cases/source.json 生成标准化的 case.json

职责：
1. 读取 raw_cases/source.json（原始 source 格式）
2. 标准化字段格式（title, body, author, images, url, note）
3. 下载图片到本地 + 上传到 OSS
4. 输出到需求目录根下的 case.json

输出格式：
  index, category, user_kept, user_comment, description, method,
  cover, title, author, body, images, url, note, _raw, workflow, capabilities
"""

import asyncio
import hashlib
import json
from pathlib import Path
from typing import Any, Dict, List, Optional


# ── OSS 工具 ──────────────────────────────────────

CDN_BASE = "https://res.cybertogether.net"


def _is_oss_url(url: str) -> bool:
    return url.startswith(CDN_BASE)


def _ext_from_path(path: str) -> str:
    """从 URL 猜测扩展名，默认 jpg"""
    p = path.split("?")[0].lower()
    for ext in ("png", "gif", "webp", "avif", "bmp", "svg", "jpg", "jpeg"):
        if p.endswith(f".{ext}"):
            return ext
    return "jpg"


async def _upload_bytes(data: bytes, filename: str) -> str:
    """上传 bytes 到 OSS，返回 CDN URL"""
    from agent.tools.builtin.file.image_cdn import _upload_bytes_to_oss
    return await _upload_bytes_to_oss(data, filename)


async def _upload_remote(url: str, cache: Dict[str, str]) -> str:
    """下载外链图片并上传到 OSS，返回 CDN URL"""
    key = hashlib.md5(url.encode()).hexdigest()[:12]
    if key in cache:
        return cache[key]

    from agent.tools.builtin.file.image_cdn import _download_image
    data = await _download_image(url)

    ext = _ext_from_path(url)
    cdn_url = await _upload_bytes(data, f"{key}.{ext}")
    cache[key] = cdn_url
    return cdn_url


async def ensure_oss_url(url: str, cache: Dict[str, str]) -> str:
    """确保图片是 OSS CDN URL"""
    if _is_oss_url(url):
        return url
    if url.startswith("http"):
        return await _upload_remote(url, cache)
    raise ValueError(f"Invalid image URL: {url}")


# ── 字段提取（各平台差异处理）────────────────────────────────────

def _extract_author(post: Dict[str, Any], platform: str) -> str:
    """字段映射：author / channel_account_name / channel"""
    if platform == "x":
        return post.get("channel_account_name") or post.get("author") or ""
    if platform == "youtube":
        return post.get("channel") or post.get("author") or ""
    return post.get("author") or ""


def _extract_url(post: Dict[str, Any], platform: str) -> str:
    """字段映射：url / link / content_link"""
    if platform == "youtube":
        return post.get("content_link") or post.get("url") or ""
    return post.get("url") or post.get("link") or ""


def _extract_body(post: Dict[str, Any], platform: str) -> str:
    """字段映射：body_text / description"""
    if platform == "youtube":
        return post.get("description") or post.get("body_text") or ""
    return post.get("body_text") or ""


def _extract_raw_images(post: Dict[str, Any], platform: str) -> List[str]:
    """字段映射：images / image_url_list / cover_url"""
    # 优先 images 字段
    if post.get("images"):
        imgs = post["images"]
        if isinstance(imgs, list) and imgs:
            return [i for i in imgs if i]

    # 其次 image_url_list
    if post.get("image_url_list"):
        raw = post["image_url_list"]
        if isinstance(raw, list):
            result = []
            for item in raw:
                if isinstance(item, dict):
                    result.append(item.get("image_url") or "")
                else:
                    result.append(item or "")
            result = [u for u in result if u]
            if result:
                return result

    # 最后兜底 cover_url
    if post.get("cover_url"):
        return [post["cover_url"]]

    return []


def _parse_published_at(timestamp_str: str) -> Optional[str]:
    """
    解析 publish_timestamp 为 ISO 8601 格式（timestamptz）

    支持格式：
    - "2026-01-09 15:53:00"
    - "2026-01-09T15:53:00"
    - 空字符串或 None 返回 None

    Returns:
        ISO 8601 格式字符串 (e.g., "2026-01-09T15:53:00+00:00") 或 None
    """
    if not timestamp_str or not isinstance(timestamp_str, str):
        return None

    timestamp_str = timestamp_str.strip()
    if not timestamp_str:
        return None

    try:
        from datetime import datetime, timezone

        # 尝试解析常见格式
        for fmt in [
            "%Y-%m-%d %H:%M:%S",
            "%Y-%m-%dT%H:%M:%S",
            "%Y-%m-%d %H:%M:%S.%f",
            "%Y-%m-%dT%H:%M:%S.%f",
        ]:
            try:
                dt = datetime.strptime(timestamp_str, fmt)
                # 假设输入是 UTC 时间，添加时区信息
                dt = dt.replace(tzinfo=timezone.utc)
                # 返回 ISO 8601 格式
                return dt.isoformat()
            except ValueError:
                continue

        # 如果都失败了，返回 None
        return None
    except Exception:
        return None


# ── 单条记录标准化 ────────────────────────────────────────────────────────────

async def normalize_source_item(
    source_item: Dict[str, Any],
    index: int,
    upload_cache: Dict[str, str],
    images_dir: Path,
) -> Dict[str, Any]:
    """
    将单条 source item 转换为标准化的 case 格式
    """
    # 从 source item 提取字段
    platform = source_item.get("platform", "")
    post = source_item.get("post", {})
    case_id = source_item.get("case_id", f"{platform}_{source_item.get('channel_content_id', '')}")

    title = post.get("title", "")
    author = _extract_author(post, platform)
    body = _extract_body(post, platform)
    url = _extract_url(post, platform) or source_item.get("source_url", "")
    likes = post.get("like_count", 0)
    comments = post.get("comment_count", 0)

    # 解析发布时间
    publish_timestamp = post.get("publish_timestamp", "")
    published_at = _parse_published_at(publish_timestamp)

    # 处理图片：下载到本地 + 上传 OSS
    raw_images = _extract_raw_images(post, platform)
    images: List[str] = []

    case_dir = images_dir / case_id
    case_dir.mkdir(parents=True, exist_ok=True)

    for idx, img_url in enumerate(raw_images):
        ext = _ext_from_path(img_url)
        local_path = case_dir / f"{idx:02d}.{ext}"

        try:
            # 下载到本地
            if not local_path.exists():
                print(f"    📥 [{idx+1}/{len(raw_images)}] 下载图片...")
                from agent.tools.builtin.file.image_cdn import _download_image
                data = await _download_image(img_url)
                local_path.write_bytes(data)
                print(f"    📥 [{idx+1}/{len(raw_images)}] 已保存 {local_path.name} ({len(data)} bytes)")
            else:
                print(f"    📁 [{idx+1}/{len(raw_images)}] 本地已存在 {local_path.name}")

            # 上传到 OSS
            if _is_oss_url(img_url):
                images.append(img_url)
                print(f"    ☁️  [{idx+1}/{len(raw_images)}] 已是 CDN URL")
            else:
                print(f"    ☁️  [{idx+1}/{len(raw_images)}] 上传 OSS...")
                cdn_url = await ensure_oss_url(img_url, upload_cache)
                images.append(cdn_url)
                print(f"    ☁️  [{idx+1}/{len(raw_images)}] 上传完成")
        except Exception as e:
            print(f"    ⚠ [{idx+1}/{len(raw_images)}] 图片处理失败: {str(e)[:60]}")

    # 兜底：对 body 里的外链图片也替换为 CDN
    try:
        from agent.tools.builtin.file.image_cdn import replace_image_urls
        body = await replace_image_urls(body)
    except Exception:
        pass

    cover = images[0] if images else ""

    return {
        "index": index,
        "category": "",
        "user_kept": False,
        "user_comment": "",
        "description": "",
        "method": "",
        "cover": cover,
        "title": title,
        "author": author,
        "body": body,
        "images": images,
        "url": url,
        "note": f"platform={platform} | likes={likes} | comments={comments}",
        "published_at": published_at,  # bigint, nullable
        "_raw": {
            "case_id": case_id,
            "platform": platform,
            "channel_content_id": source_item.get("channel_content_id", ""),
        },
        "workflow": None,
        "capabilities": None,
    }


# ── 主入口 ────────────────────────────────

async def generate_case_from_source(
    raw_cases_dir: Path,
    output_file: Optional[Path] = None,
) -> Dict[str, Any]:
    """
    从 raw_cases/source.json 生成标准化的 case.json

    如果 case.json 已存在，会保留已有的 workflow 和 capabilities
    """
    raw_cases_dir = Path(raw_cases_dir)
    source_file = raw_cases_dir / "source.json"

    if not source_file.exists():
        raise FileNotFoundError(f"source.json not found: {source_file}")

    # 读取 source.json
    with open(source_file, "r", encoding="utf-8") as f:
        source_data = json.load(f)

    sources = source_data.get("sources", [])
    print(f"Processing {len(sources)} sources...")

    # 读取已有的 case.json（如果存在）
    if output_file is None:
        output_file = raw_cases_dir.parent / "case.json"

    existing_cases = {}
    if output_file.exists():
        try:
            with open(output_file, "r", encoding="utf-8") as f:
                existing_data = json.load(f)
                existing_list = existing_data.get("cases", [])
                # 建立 case_id -> case 的映射
                for case in existing_list:
                    case_id = case.get("_raw", {}).get("case_id")
                    if case_id:
                        existing_cases[case_id] = case
                print(f"Found {len(existing_cases)} existing cases, will preserve workflow and capabilities")
        except Exception as e:
            print(f"Warning: Failed to read existing case.json: {e}")

    # 准备图片目录
    images_dir = raw_cases_dir / "images"
    images_dir.mkdir(parents=True, exist_ok=True)

    # 标准化所有 source items
    cases: List[Dict[str, Any]] = []
    upload_cache: Dict[str, str] = {}

    for idx, source_item in enumerate(sources, 1):
        try:
            case = await normalize_source_item(
                source_item=source_item,
                index=idx,
                upload_cache=upload_cache,
                images_dir=images_dir,
            )

            # 如果已有该 case，保留其 workflow 和 capabilities
            case_id = case.get("_raw", {}).get("case_id")
            if case_id and case_id in existing_cases:
                existing = existing_cases[case_id]
                if existing.get("workflow") is not None:
                    case["workflow"] = existing["workflow"]
                if existing.get("capabilities") is not None:
                    case["capabilities"] = existing["capabilities"]
                print(f"  [{idx}] {case['title'][:40]} (preserved workflow & capabilities)")
            else:
                print(f"  [{idx}] {case['title'][:40]}")

            cases.append(case)
        except Exception as e:
            print(f"  [{idx}] ✗ 失败: {e}")

    # 输出 case.json
    output_data = {
        "total": len(cases),
        "cases": cases,
    }

    output_file.parent.mkdir(parents=True, exist_ok=True)
    with open(output_file, "w", encoding="utf-8") as f:
        json.dump(output_data, f, ensure_ascii=False, indent=2)

    return {
        "total_cases": len(cases),
        "output_file": str(output_file),
    }


if __name__ == "__main__":
    import sys
    if len(sys.argv) < 2:
        print("Usage: python generate_case.py <raw_cases_dir>")
        sys.exit(1)

    raw_cases_dir = Path(sys.argv[1])

    stats = asyncio.run(generate_case_from_source(raw_cases_dir))
    print(f"\n✓ Generated {stats['total_cases']} cases")
    print(f"→ {stats['output_file']}")