#!/usr/bin/env python3
"""Write split X-Financial development logs."""

from __future__ import annotations

import argparse
import os
import re
import subprocess
from dataclasses import dataclass
from datetime import datetime
from pathlib import Path


BUG_SECTION = "## 修复记录"
WORK_LOG_NAME = "work-logs.med"


@dataclass
class CommandResult:
    args: list[str]
    returncode: int
    stdout: str
    stderr: str

    @property
    def ok(self) -> bool:
        return self.returncode == 0

    @property
    def message(self) -> str:
        return (self.stderr.strip() or self.stdout.strip()).strip()


def run(args: list[str], cwd: Path, timeout: int = 60) -> CommandResult:
    try:
        result = subprocess.run(
            args,
            cwd=cwd,
            text=True,
            stdout=subprocess.PIPE,
            stderr=subprocess.PIPE,
            timeout=timeout,
        )
    except subprocess.TimeoutExpired as exc:
        return CommandResult(args, 124, exc.stdout or "", exc.stderr or "command timed out")
    return CommandResult(args, result.returncode, result.stdout, result.stderr)


def git(args: list[str], cwd: Path, timeout: int = 60) -> CommandResult:
    return run(["git", *args], cwd, timeout=timeout)


def repo_root() -> Path:
    result = run(["git", "rev-parse", "--show-toplevel"], Path.cwd())
    if not result.ok:
        raise SystemExit(f"Not inside a git repository: {result.message}")
    return Path(result.stdout.strip())


def one_line(value: str) -> str:
    return " ".join(value.strip().split())


def compact_lines(text: str, limit: int = 8) -> list[str]:
    lines = [line.strip() for line in text.splitlines() if line.strip()]
    if not lines:
        return ["未发现"]
    shown = lines[:limit]
    if len(lines) > limit:
        shown.append(f"... 另有 {len(lines) - limit} 条")
    return shown


def slugify(value: str, fallback: str) -> str:
    normalized = value.strip().lower()
    chars: list[str] = []
    previous_dash = False
    for char in normalized:
        keep = char.isascii() and char.isalnum()
        keep = keep or "\u4e00" <= char <= "\u9fff"
        if keep:
            chars.append(char)
            previous_dash = False
        elif not previous_dash:
            chars.append("-")
            previous_dash = True
    slug = "".join(chars).strip("-")
    return slug or fallback


def date_dir(root: Path, date_text: str) -> Path:
    return root / "document" / "development" / date_text


def bugs_dir(root: Path, date_text: str) -> Path:
    return date_dir(root, date_text) / "dev-logs" / "bugs"


def feature_dir(root: Path, date_text: str) -> Path:
    return date_dir(root, date_text) / "feature"


def collect_git(root: Path, *, no_fetch: bool, max_commits: int) -> dict[str, str | bool]:
    data: dict[str, str | bool] = {}

    fetch_result = CommandResult(["git", "fetch"], 0, "", "")
    if no_fetch:
        data["fetch"] = "已跳过 fetch（--no-fetch）"
    else:
        fetch_result = git(["fetch", "--all", "--prune"], root, timeout=60)
        data["fetch"] = "成功" if fetch_result.ok else f"失败：{one_line(fetch_result.message)}"

    status = git(["status", "-sb"], root)
    data["status"] = status.stdout.strip() if status.ok else f"读取失败：{one_line(status.message)}"

    upstream = git(["rev-parse", "--abbrev-ref", "--symbolic-full-name", "@{u}"], root)
    if upstream.ok:
        data["upstream"] = upstream.stdout.strip()
        behind = git(["log", "--oneline", "--decorate", f"--max-count={max_commits}", "HEAD..@{u}"], root)
        ahead = git(["log", "--oneline", "--decorate", f"--max-count={max_commits}", "@{u}..HEAD"], root)
        data["behind"] = behind.stdout.strip() if behind.ok else f"读取失败：{one_line(behind.message)}"
        data["ahead"] = ahead.stdout.strip() if ahead.ok else f"读取失败：{one_line(ahead.message)}"
    else:
        data["upstream"] = ""
        data["behind"] = "无 upstream 分支"
        data["ahead"] = "无 upstream 分支"

    head_hash = git(["rev-parse", "--short", "HEAD"], root)
    head_subject = git(["show", "-s", "--format=%s", "HEAD"], root)
    data["head_hash"] = head_hash.stdout.strip() if head_hash.ok else ""
    data["head_subject"] = head_subject.stdout.strip() if head_subject.ok else ""
    data["fetch_failed"] = not fetch_result.ok
    return data


def git_check_text(git_data: dict[str, str | bool]) -> str:
    behind_text = "；".join(compact_lines(str(git_data.get("behind") or "")))
    ahead_text = "；".join(compact_lines(str(git_data.get("ahead") or "")))
    upstream = git_data.get("upstream") or "未配置"
    return (
        f"fetch {git_data.get('fetch')}；upstream `{upstream}`；"
        f"upstream 新提交：{behind_text}；本地 ahead 提交：{ahead_text}"
    )


def looks_like_bug(subject: str) -> bool:
    lower = subject.strip().lower()
    if lower.startswith(("fix", "bugfix", "hotfix", "revert")):
        return True
    return any(keyword in lower for keyword in ("bug", "修复", "缺陷", "故障", "报错", "失败", "异常"))


def insert_under_section(content: str, section: str, entry: str) -> str:
    marker = f"{section}\n"
    start = content.find(marker)
    if start == -1:
        return content.rstrip() + f"\n\n{section}\n\n{entry.rstrip()}\n"

    insert_at = start + len(marker)
    next_section = content.find("\n## ", insert_at)
    entry_text = "\n" + entry.rstrip() + "\n"
    if next_section == -1:
        return content[:insert_at].rstrip() + entry_text
    before = content[:next_section].rstrip()
    after = content[next_section:]
    return before + entry_text + after


def ensure_bug_document(path: Path, *, title: str, date_text: str) -> str:
    if path.exists():
        content = path.read_text(encoding="utf-8")
    else:
        rel_path = path.as_posix().split("document/development/", 1)[-1]
        content = "\n".join(
            [
                f"# {title}",
                "",
                f"日期：{date_text}",
                f"文档路径：document/development/{rel_path}",
                "",
                BUG_SECTION,
                "",
            ]
        )

    if not content.endswith("\n"):
        content += "\n"
    if BUG_SECTION not in content:
        content += f"\n{BUG_SECTION}\n"
    return content


def build_bug_entry(now: datetime, event: str, title: str, git_data: dict[str, str | bool]) -> str:
    time_text = now.strftime("%H:%M")
    head_hash = str(git_data.get("head_hash") or "")
    head_subject = str(git_data.get("head_subject") or "")
    marker = f"bug-log:{head_hash}" if head_hash else f"bug-log:{time_text}"
    return "\n".join(
        [
            f"- {time_text}：记录 bug 修复：{title}。（{marker}）",
            f"  - Git 提交检查：{git_check_text(git_data)}。",
            f"  - 修改：最近提交为 `{head_hash} {head_subject}`。",
            f"  - 操作：{event} 触发 `tools/agent-change-log/update_change_log.py --kind bug`，写入当天 `dev-logs/bugs`。",
            "  - 验证：记录修复时应引用本次任务实际运行的测试、构建或手工验证结果；自动脚本不替代业务验证。",
            "  - 影响：该 bug 会在 17:00 综合日志中与当天功能点一起汇总。",
        ]
    )


def write_bug_log(args: argparse.Namespace, root: Path, now: datetime, git_data: dict[str, str | bool]) -> int:
    date_text = args.date or now.strftime("%Y-%m-%d")
    head_hash = str(git_data.get("head_hash") or "")
    head_subject = str(git_data.get("head_subject") or "")
    title = args.bug_title or head_subject or "未命名 bug 修复"
    slug = slugify(args.bug_slug or title, fallback=f"bug-{head_hash or now.strftime('%H%M%S')}")
    path = Path(args.log_path) if args.log_path else bugs_dir(root, date_text) / f"{slug}.md"
    entry = build_bug_entry(now, args.event, title, git_data)
    marker = f"bug-log:{head_hash}" if head_hash else ""

    if args.dry_run:
        print(f"target_log={os.path.relpath(path, root)}")
        print(entry)
        return 0

    content = ensure_bug_document(path, title=title, date_text=date_text)
    if marker and marker in content and not args.force:
        print(f"Bug log already contains {marker}; skipping.")
        return 0

    content = insert_under_section(content, BUG_SECTION, entry)
    path.parent.mkdir(parents=True, exist_ok=True)
    path.write_text(content, encoding="utf-8")
    print(f"updated_bug_log={os.path.relpath(path, root)}")
    return 0


def first_heading(path: Path) -> str:
    for line in path.read_text(encoding="utf-8").splitlines():
        if line.startswith("# "):
            return line[2:].strip()
    return path.parent.name


def section_first_text(content: str, section: str) -> str:
    marker = f"## {section}"
    start = content.find(marker)
    if start == -1:
        return ""
    tail = content[start + len(marker) :].split("\n## ", 1)[0]
    for line in tail.splitlines():
        stripped = line.strip()
        if stripped and not stripped.startswith("#"):
            return stripped.strip("- ").strip()
    return ""


def summarize_feature(path: Path) -> str:
    concept = path / "CONCEPT.md"
    todo = path / "TODO.md"
    title = path.name
    sentence = ""
    if concept.exists():
        concept_text = concept.read_text(encoding="utf-8")
        title = first_heading(concept)
        sentence = section_first_text(concept_text, "功能一句话")

    todo_text = todo.read_text(encoding="utf-8") if todo.exists() else ""
    done_count = len(re.findall(r"^- \[x\]", todo_text, flags=re.MULTILINE | re.IGNORECASE))
    open_count = len(re.findall(r"^- \[ \]", todo_text, flags=re.MULTILINE))
    status = f"TODO 完成 {done_count} 项，未完成 {open_count} 项" if todo.exists() else "未找到 TODO.md"
    detail = sentence or "未提取到功能一句话"
    return f"- {title}：{detail}（{status}；目录：`{path.name}`）"


def summarize_bug(path: Path) -> str:
    title = first_heading(path)
    content = path.read_text(encoding="utf-8")
    latest = ""
    for line in content.splitlines():
        stripped = line.strip()
        if stripped.startswith("- ") and "：" in stripped:
            latest = stripped[2:]
    return f"- {title}：{latest or '已记录修复内容'}（文件：`{path.name}`）"


def build_daily_summary(root: Path, date_text: str, now: datetime) -> str:
    features = []
    feature_root = feature_dir(root, date_text)
    if feature_root.exists():
        for path in sorted(feature_root.iterdir()):
            if path.is_dir():
                features.append(summarize_feature(path))

    bugs = []
    bug_root = bugs_dir(root, date_text)
    if bug_root.exists():
        for path in sorted(bug_root.glob("*.md")):
            bugs.append(summarize_bug(path))

    feature_text = "\n".join(features) if features else "- 今日未发现功能点文档。"
    bug_text = "\n".join(bugs) if bugs else "- 今日未发现 bug 修复记录。"
    analysis_parts = []
    if features:
        analysis_parts.append(f"功能侧沉淀了 {len(features)} 个功能点")
    if bugs:
        analysis_parts.append(f"问题侧记录了 {len(bugs)} 个 bug 修复")
    analysis = "，".join(analysis_parts) if analysis_parts else "今日目录下暂无功能点或 bug 记录"

    return "\n".join(
        [
            f"# {date_text} 综合工作日志",
            "",
            f"生成时间：{now.strftime('%Y-%m-%d %H:%M:%S %Z')}",
            "来源：`feature/` 功能点文档与 `dev-logs/bugs/` bug 记录",
            "",
            "## 今日功能点",
            "",
            feature_text,
            "",
            "## 今日 Bugs",
            "",
            bug_text,
            "",
            "## 综合分析",
            "",
            f"- {analysis}。",
            "- 后续复盘优先看本文件，再回到对应功能点或 bug 文件追溯证据。",
            "",
        ]
    )


def write_daily_summary(args: argparse.Namespace, root: Path, now: datetime) -> int:
    date_text = args.date or now.strftime("%Y-%m-%d")
    path = Path(args.log_path) if args.log_path else date_dir(root, date_text) / WORK_LOG_NAME
    content = build_daily_summary(root, date_text, now)

    if args.dry_run:
        print(f"target_log={os.path.relpath(path, root)}")
        print(content)
        return 0

    path.parent.mkdir(parents=True, exist_ok=True)
    path.write_text(content, encoding="utf-8")
    print(f"updated_work_log={os.path.relpath(path, root)}")
    return 0


def parse_args() -> argparse.Namespace:
    parser = argparse.ArgumentParser(description=__doc__)
    parser.add_argument("--kind", choices=("auto", "bug", "summary"), default="auto")
    parser.add_argument("--event", default="manual", help="Human-readable trigger source.")
    parser.add_argument("--date", help="Override log date YYYY-MM-DD.")
    parser.add_argument("--log-path", help="Override output log path.")
    parser.add_argument("--bug-title", help="Human-readable bug title.")
    parser.add_argument("--bug-slug", help="Stable bug log file slug.")
    parser.add_argument("--dry-run", action="store_true", help="Print output without writing files.")
    parser.add_argument("--force", action="store_true", help="Write even if this commit marker already exists.")
    parser.add_argument("--no-fetch", action="store_true", help="Skip git fetch; useful for tests or offline hooks.")
    parser.add_argument("--max-commits", type=int, default=20, help="Maximum commits to summarize per direction.")
    return parser.parse_args()


def main() -> int:
    args = parse_args()
    root = repo_root()
    now = datetime.now().astimezone()

    if args.kind == "summary":
        return write_daily_summary(args, root, now)

    git_data = collect_git(root, no_fetch=args.no_fetch, max_commits=args.max_commits)
    subject = str(git_data.get("head_subject") or "")

    if args.kind == "auto" and not looks_like_bug(subject):
        print(f"skipped_non_bug_commit={subject}")
        return 0

    return write_bug_log(args, root, now, git_data)


if __name__ == "__main__":
    raise SystemExit(main())