#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
从书稿 Markdown 中仅解析「图片」引用并上传到现网，再生成 HTML 写入 chapters.content。

- 只处理：`![](相对/绝对路径.png)` 等常见图片后缀；**不解析、不上传视频/附件**。
- 已是 `http(s)://` 的地址：不重复上传，原样写入 `<img src="...">`。
- 非图片后缀的 `![]()`：当作普通正文一行输出（不尝试上传）。

用法:
  cd 一场soul的创业实验-永平
  python3 scripts/sync_chapter_images_from_md.py --id 10.22 \\
    --md "/path/to/第130场｜….md"

依赖: pip install pymysql requests
环境变量: SOUL_API_BASE 默认 https://soulapi.quwanzhi.com
"""
from __future__ import annotations

import argparse
import html
import importlib.util
import os
import re
import sys
from pathlib import Path

ROOT = Path(__file__).resolve().parent.parent

IMAGE_EXT = frozenset({".png", ".jpg", ".jpeg", ".gif", ".webp"})

# 整行仅有一张图：![](...)
LINE_IMAGE_ONLY = re.compile(r"^\s*!\[([^\]]*)\]\(([^)]+)\)\s*$")

try:
    import pymysql
    import requests
except ImportError as e:
    print("需要: pip install pymysql requests", e, file=sys.stderr)
    sys.exit(1)


def load_db_config() -> dict:
    mig = ROOT / "scripts" / "migrate_2026_sections.py"
    spec = importlib.util.spec_from_file_location("_mig_db", mig)
    mod = importlib.util.module_from_spec(spec)
    assert spec.loader is not None
    spec.loader.exec_module(mod)
    cfg = getattr(mod, "DB_CONFIG", None)
    if not isinstance(cfg, dict):
        sys.exit("migrate_2026_sections.py 中无有效 DB_CONFIG")
    return cfg


def resolve_local_path(md_path: Path, ref: str) -> Path | None:
    ref = ref.strip()
    if not ref or ref.startswith(("http://", "https://")):
        return None
    p = (md_path.parent / ref).expanduser().resolve()
    if p.is_file():
        return p
    return None


def guess_mime(path: Path) -> str:
    ext = path.suffix.lower()
    return {
        ".png": "image/png",
        ".jpg": "image/jpeg",
        ".jpeg": "image/jpeg",
        ".gif": "image/gif",
        ".webp": "image/webp",
    }.get(ext, "application/octet-stream")


def upload_image(local: Path, api_base: str) -> str:
    url = f"{api_base.rstrip('/')}/api/upload"
    mime = guess_mime(local)
    with local.open("rb") as f:
        files = {"file": (local.name, f, mime)}
        data = {"folder": "book-images"}
        r = requests.post(url, files=files, data=data, timeout=120)
    r.raise_for_status()
    j = r.json()
    if not j.get("success"):
        raise RuntimeError(j.get("error") or j.get("message") or str(j))
    out = j.get("url") or (j.get("data") or {}).get("url")
    if not out:
        raise RuntimeError("响应无 url: " + str(j)[:500])
    return str(out)


def md_to_html(md_path: Path, api_base: str) -> str:
    raw = md_path.read_text(encoding="utf-8")
    lines = raw.splitlines()
    if lines and lines[0].lstrip().startswith("#"):
        lines = lines[1:]

    chunks: list[str] = []
    upload_cache: dict[str, str] = {}

    for line in lines:
        if line.strip() == "---":
            chunks.append("")
            continue

        m = LINE_IMAGE_ONLY.match(line)
        if m:
            alt, ref = m.group(1), m.group(2).strip()
            if ref.startswith(("http://", "https://")):
                chunks.append(
                    f'<p><img src="{html.escape(ref)}" alt="{html.escape(alt)}"/></p>'
                )
                continue
            loc = resolve_local_path(md_path, ref)
            if not loc:
                chunks.append(f"<p>（图片路径无效：{html.escape(ref)}）</p>")
                continue
            ext = loc.suffix.lower()
            if ext not in IMAGE_EXT:
                # 非图片（如视频）：不解析、不上传，整行当正文
                chunks.append(f"<p>{html.escape(line.strip())}</p>")
                continue
            key = str(loc)
            if key not in upload_cache:
                print(f"上传图片: {loc.name} …", flush=True)
                upload_cache[key] = upload_image(loc, api_base)
            src = upload_cache[key]
            chunks.append(
                f'<p><img src="{html.escape(src)}" alt="{html.escape(alt)}"/></p>'
            )
            continue

        if line.strip():
            chunks.append(f"<p>{html.escape(line.strip())}</p>")
        else:
            chunks.append("")

    # 合并连续空串为单个换行，避免多余空 <p>
    html_parts: list[str] = []
    for c in chunks:
        if c == "":
            if html_parts and html_parts[-1] != "":
                html_parts.append("")
        else:
            html_parts.append(c)
    return "\n".join(html_parts).strip() + "\n"


def main() -> None:
    p = argparse.ArgumentParser(description="MD 内图片上传并写回 chapters（仅图片）")
    p.add_argument("--id", required=True, help="章节 id，如 10.22")
    p.add_argument("--md", type=Path, required=True, help="文章 .md 路径")
    p.add_argument(
        "--api-base",
        default=os.environ.get("SOUL_API_BASE", "https://soulapi.quwanzhi.com"),
        help="API 根地址",
    )
    p.add_argument("--dry-run", action="store_true", help="只打印 HTML 前 800 字，不写库")
    args = p.parse_args()

    md_path = args.md.expanduser().resolve()
    if not md_path.is_file():
        sys.exit(f"文件不存在: {md_path}")

    body = md_to_html(md_path, args.api_base)
    word_count = len(body)

    if args.dry_run:
        print(body[:800])
        print("… dry-run，word_count=", word_count)
        return

    cfg = load_db_config()
    conn = pymysql.connect(**cfg)
    cur = conn.cursor()
    cur.execute(
        "UPDATE chapters SET content = %s, word_count = %s, updated_at = NOW() WHERE id = %s",
        (body, word_count, args.id),
    )
    if cur.rowcount != 1:
        conn.rollback()
        sys.exit(f"更新失败：id={args.id} rowcount={cur.rowcount}")
    conn.commit()
    conn.close()
    print(f"已更新 {args.id} | word_count={word_count}")


if __name__ == "__main__":
    main()