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

import argparse
import re
import shutil
import sys
from datetime import datetime
from pathlib import Path

ROOT = Path(__file__).resolve().parents[1]
sys.path.insert(0, str(ROOT))

from app.data import (  # noqa: E402
    append_operation_log,
    course_summary_semantic_key,
    create_course_summary_review_task,
    normalize_course_summary,
    read_admin_tasks,
    read_course_summary_state,
    safe_filename_part,
    sha1_text,
    write_course_summary_state,
)


EXCLUDE_MARKDOWN = {
    "微信聊天记录ID映射表.md",
    "采集记录表.md",
    "课程记录核对表.md",
}
EXCLUDE_PREFIXES = (
    "已采集小结记录",
    "classnotes缺失",
    "课程小结缺失",
    "疑似 classnotes 出错",
    "疑似课程小结待复核",
    "正文日期晚于发送日期待复核",
)


def parse_args() -> argparse.Namespace:
    parser = argparse.ArgumentParser(description="导入历史课程小结 Markdown 到 VPS 数据目录")
    parser.add_argument("--source", required=True, type=Path, help="本机历史课程小结采集目录")
    parser.add_argument("--target", default=Path("/data/course_summaries"), type=Path, help="VPS 课程小结正式目录")
    parser.add_argument("--state", default=Path("/data/course_summary_state.json"), type=Path, help="课程小结状态文件")
    parser.add_argument("--tasks", default=Path("/data/admin_tasks.json"), type=Path, help="管理任务文件")
    parser.add_argument("--operation-logs", default=Path("/data/operation_logs.jsonl"), type=Path, help="操作日志文件")
    parser.add_argument("--missing-table", type=Path, help="历史 classnotes缺失.txt；不传则尝试 source/classnotes缺失.txt")
    parser.add_argument("--dry-run", action="store_true", help="只统计，不写入")
    return parser.parse_args()


def should_import_markdown(path: Path, source: Path) -> bool:
    if path.name in EXCLUDE_MARKDOWN or any(path.name.startswith(prefix) for prefix in EXCLUDE_PREFIXES):
        return False
    if any(part in {"__pycache__", "临时解析归档", "推送归档", "推送失败队列"} for part in path.relative_to(source).parts):
        return False
    return path.suffix.lower() == ".md"


def split_name_from_path(path: Path) -> tuple[str, str, str]:
    parts = path.stem.split("_")
    student = path.parent.name if path.parent.name else (parts[0] if parts else "")
    teacher = parts[1] if len(parts) >= 2 else ""
    subject = parts[2] if len(parts) >= 3 else ""
    return student, teacher, subject


def iter_markdown_entries(path: Path) -> list[dict]:
    text = path.read_text(encoding="utf-8", errors="ignore")
    student, teacher, subject = split_name_from_path(path)
    group = student
    current_title = ""
    current_body: list[str] = []
    entries: list[dict] = []

    def flush() -> None:
        if not current_title:
            return
        body = "\n".join(current_body).strip()
        date_match = re.search(r"(\d{4}[.-]\d{2}[.-]\d{2})", current_title)
        if not date_match or not body:
            return
        time_match = re.search(r"(\d{1,2}:\d{2}-\d{1,2}:\d{2})", current_title)
        source_seed = f"{path}|{current_title}|{body[:120]}"
        entries.append(
            {
                "source_id": f"history:{sha1_text(source_seed, 24)}",
                "student": student,
                "date_iso": date_match.group(1).replace(".", "-"),
                "time_range": time_match.group(1) if time_match else "",
                "teacher": teacher,
                "subject": subject,
                "group": group,
                "title": current_title,
                "body": body,
                "recognition_source": "history_import",
                "confidence": "history",
                "teacher_trusted": False,
                "remark": f"历史导入：{path}",
            }
        )

    for line in text.splitlines():
        if line.startswith("## ") and not line.startswith("### "):
            group = line.removeprefix("## ").strip() or group
            continue
        if line.startswith("### "):
            flush()
            current_title = line.removeprefix("### ").strip()
            current_body = []
            continue
        if current_title:
            if line.startswith("> 来源ID") or line.startswith("> 发送时间") or line.startswith("> 发送者"):
                continue
            current_body.append(line)
    flush()
    return entries


def copy_markdown_files(source: Path, target: Path, dry_run: bool) -> tuple[int, int]:
    copied = 0
    scanned = 0
    for path in sorted(source.rglob("*.md")):
        if not should_import_markdown(path, source):
            continue
        scanned += 1
        relative = path.relative_to(source)
        dest = target / relative
        if dest.exists() and dest.read_text(encoding="utf-8", errors="ignore") == path.read_text(encoding="utf-8", errors="ignore"):
            continue
        copied += 1
        if not dry_run:
            dest.parent.mkdir(parents=True, exist_ok=True)
            shutil.copy2(path, dest)
    return scanned, copied


def rebuild_state_from_markdown(source: Path, state_path: Path, dry_run: bool) -> tuple[int, int]:
    state = read_course_summary_state(state_path)
    seen_source_ids = set(str(item) for item in state.get("seen_source_ids", []))
    seen_semantic_keys = set(str(item) for item in state.get("seen_semantic_keys", []))
    imported = 0
    skipped = 0
    for path in sorted(source.rglob("*.md")):
        if not should_import_markdown(path, source):
            continue
        for entry in iter_markdown_entries(path):
            try:
                summary = normalize_course_summary(entry)
                seen_source_ids.add(summary["source_id"])
                seen_semantic_keys.add(course_summary_semantic_key(summary))
                imported += 1
            except ValueError:
                skipped += 1
    state["seen_source_ids"] = sorted(seen_source_ids)
    state["seen_semantic_keys"] = sorted(seen_semantic_keys)
    state.setdefault("batches", []).append(
        {
            "batch_id": f"history-import-{datetime.now().strftime('%Y%m%d%H%M%S')}",
            "received_at": datetime.now().isoformat(timespec="seconds"),
            "window": {"mode": "历史导入"},
            "students": [],
            "result": {"received": imported, "saved": 0, "auto_registered": 0, "review_pending": 0, "duplicates": 0, "rejected": skipped},
        }
    )
    state["batches"] = state["batches"][-200:]
    if not dry_run:
        write_course_summary_state(state_path, state)
    return imported, skipped


def parse_missing_table(path: Path) -> list[dict]:
    if not path.exists():
        return []
    rows: list[dict] = []
    headers: list[str] = []
    for raw_line in path.read_text(encoding="utf-8", errors="ignore").splitlines():
        line = raw_line.strip()
        if not line.startswith("| ") or "---" in line:
            continue
        cells = [cell.strip() for cell in line.strip("|").split("|")]
        if cells and cells[0] == "日期":
            headers = cells
            continue
        if not headers or len(cells) != len(headers):
            continue
        row = dict(zip(headers, cells, strict=False))
        if row.get("学生"):
            rows.append(row)
    return rows


def import_missing_tasks(missing_table: Path, tasks_path: Path, dry_run: bool) -> int:
    rows = parse_missing_table(missing_table)
    if not rows:
        return 0
    existing = read_admin_tasks(tasks_path)
    existing_source_ids = {str(item.get("source_id") or "") for item in existing.get("items", [])}
    created = 0
    for row in rows:
        source_seed = "|".join(str(row.get(key, "")) for key in ("日期", "学生", "老师", "科目", "来源文件", "备注"))
        source_id = f"history-missing:{sha1_text(source_seed, 20)}"
        if source_id in existing_source_ids:
            continue
        summary = {
            "source_id": source_id,
            "student": row.get("学生", ""),
            "date_iso": str(row.get("日期", "")).replace(".", "-"),
            "time_range": row.get("时间段", ""),
            "duration": row.get("时长", ""),
            "teacher": row.get("老师", ""),
            "subject": row.get("科目", ""),
            "group": row.get("群聊", ""),
            "title": "历史 classnotes 缺失",
            "body": f"历史 classnotes 缺失项：{source_seed}",
            "recognition_source": "history_missing_table",
            "confidence": "review",
            "teacher_trusted": False,
            "remark": row.get("备注", ""),
        }
        created += 1
        if not dry_run:
            create_course_summary_review_task(
                tasks_path,
                summary,
                "",
                ["历史 classnotes缺失导入，默认只进入审核，不自动扣课时"],
                saved_path=row.get("来源文件", ""),
            )
            existing_source_ids.add(source_id)
    return created


def main() -> None:
    args = parse_args()
    source = args.source.resolve()
    target = args.target.resolve()
    missing_table = args.missing_table or (source / "classnotes缺失.txt")
    scanned, copied = copy_markdown_files(source, target, args.dry_run)
    imported, skipped = rebuild_state_from_markdown(target if target.exists() else source, args.state, args.dry_run)
    review_tasks = import_missing_tasks(missing_table, args.tasks, args.dry_run)
    if not args.dry_run:
        append_operation_log(
            args.operation_logs,
            "history_course_summary_import",
            "completed",
            source=str(source),
            target=str(target),
            scanned_files=scanned,
            copied_files=copied,
            indexed_summaries=imported,
            skipped_summaries=skipped,
            review_tasks=review_tasks,
        )
    print(
        f"历史小结导入完成：扫描 Markdown {scanned} 个，复制 {copied} 个，"
        f"索引小结 {imported} 条，跳过 {skipped} 条，生成审核任务 {review_tasks} 条。"
    )


if __name__ == "__main__":
    main()