#!/usr/bin/env python3
from __future__ import annotations

import os
import re
import subprocess
from collections import OrderedDict
from pathlib import Path

CURRENT_TAG = os.environ["CURRENT_TAG"]
PREVIOUS_TAG = os.environ.get("PREVIOUS_TAG", "")
RELEASE_BRANCH = os.environ.get("RELEASE_BRANCH", "")
GITHUB_REPOSITORY = os.environ.get("GITHUB_REPOSITORY", "zoujingli/ThinkAdmin")

GROUPS = OrderedDict([
    ("feat", "新增功能"),
    ("fix", "问题修复"),
    ("refactor", "重构调整"),
    ("perf", "性能优化"),
    ("pref", "性能优化"),
    ("style", "样式调整"),
    ("docs", "文档更新"),
    ("test", "测试质量"),
    ("build", "构建发布"),
    ("ci", "持续集成"),
    ("chore", "工程维护"),
    ("other", "其他变更"),
])

PREFIX_RE = re.compile(r"^(?P<type>[a-z]+)(?:\((?P<scope>[^)]+)\))?[:：]\s*(?P<title>.+)$")


def git_lines(*args: str) -> list[str]:
    out = subprocess.check_output(["git", *args], text=True)
    return [line for line in out.splitlines() if line]


def release_range() -> str:
    if PREVIOUS_TAG:
        return f"{PREVIOUS_TAG}..{CURRENT_TAG}"
    return CURRENT_TAG


def commits() -> list[tuple[str, str]]:
    lines = git_lines("log", "--pretty=format:%H%x01%s", release_range())
    result: list[tuple[str, str]] = []
    for line in lines:
        sha, subject = line.split("\x01", 1)
        result.append((sha, subject))
    return result


def normalize(subject: str) -> tuple[str, str]:
    match = PREFIX_RE.match(subject)
    if not match:
        return "other", subject
    typ = match.group("type")
    title = match.group("title")
    if typ not in GROUPS:
        typ = "other"
    scope = match.group("scope")
    if scope:
        title = f"【{scope}】{title}"
    return typ, title


def main() -> None:
    grouped: dict[str, list[str]] = {key: [] for key in GROUPS}
    all_commits = commits()

    for sha, subject in all_commits:
        typ, title = normalize(subject)
        grouped[typ].append(f"- {title} ({sha[:8]})")

    lines: list[str] = []
    lines.append(f"## Release {CURRENT_TAG}")
    lines.append("")
    if RELEASE_BRANCH:
        lines.append(f"- 发布分支：`{RELEASE_BRANCH}`")
    if PREVIOUS_TAG:
        compare_url = f"https://github.com/{GITHUB_REPOSITORY}/compare/{PREVIOUS_TAG}...{CURRENT_TAG}"
        lines.append(f"- 对比范围：[`{PREVIOUS_TAG}...{CURRENT_TAG}`]({compare_url})")
    else:
        lines.append("- 对比范围：首次发布标签")
    lines.append(f"- 提交数量：{len(all_commits)}")
    lines.append("")

    lines.append("## 本次变更摘要")
    lines.append("")
    summary = [f"{label} {len(items)} 项" for key, label in GROUPS.items() if (items := grouped[key])]
    lines.append("、".join(summary) if summary else "- 本次发布没有检测到提交变更。")
    lines.append("")

    lines.append("## 变更明细")
    lines.append("")
    for key, label in GROUPS.items():
        items = grouped[key]
        if not items:
            continue
        lines.append(f"### {label}")
        lines.extend(items)
        lines.append("")

    lines.append("## 发布说明")
    lines.append("")
    lines.append("- 主仓库 Release 由 GitHub Actions 自动创建。")
    lines.append("- 插件仓库会同步推送同名分支和同名 Tag，Packagist 可通过 GitHub Hook 自动刷新。")
    lines.append("- v6 与 v8 使用不同主版本号 Tag，避免两个开发分支发布互相覆盖。")
    lines.append("")

    out = Path("log") / f"{CURRENT_TAG}.md"
    out.parent.mkdir(parents=True, exist_ok=True)
    out.write_text("\n".join(lines), encoding="utf-8")
    print(out)


if __name__ == "__main__":
    main()