from __future__ import annotations

import csv
import sys
from pathlib import Path
from typing import Dict, List, Optional

from ad_user_creator.cli import build_parser
from ad_user_creator.config import load_config
from ad_user_creator.exceptions import AppError, ConfigError, InputValidationError, LdapConnectionError
from ad_user_creator.input_parser import parse_input_file
from ad_user_creator.interactive import run_interactive_create
from ad_user_creator.ldap_client import LdapClient
from ad_user_creator.logging_setup import setup_logging
from ad_user_creator.models import UserProcessResult
from ad_user_creator.persistence import StateStore
from ad_user_creator.user_service import UserService


def _write_batch_results(path: str, rows: List[Dict[str, str]]) -> None:
    output = Path(path)
    output.parent.mkdir(parents=True, exist_ok=True)
    headers = ["姓名", "用户名", "邮箱", "部门 OU", "基础组", "项目组", "资源组", "状态", "原因", "用户DN", "uidNumber"]
    with output.open("w", encoding="utf-8-sig", newline="") as handle:
        writer = csv.DictWriter(handle, fieldnames=headers)
        writer.writeheader()
        for row in rows:
            writer.writerow(row)


def _to_bool_text(value: str) -> bool:
    return value.lower() == "true"


def _result_to_row(raw: Dict[str, str], result: UserProcessResult) -> Dict[str, str]:
    return {
        "姓名": raw.get("姓名", ""),
        "用户名": raw.get("用户名", ""),
        "邮箱": raw.get("邮箱", ""),
        "部门 OU": raw.get("部门 OU", ""),
        "基础组": raw.get("基础组", ""),
        "项目组": raw.get("项目组", ""),
        "资源组": raw.get("资源组", ""),
        "状态": result.status,
        "原因": result.reason,
        "用户DN": result.user_dn,
        "uidNumber": "" if result.uid_number is None else str(result.uid_number),
    }


def execute_command(
    command: str,
    config_path: str = "config/config.yaml",
    dry_run: bool = False,
    input_path: Optional[str] = None,
    continue_on_error: bool = True,
) -> int:
    try:
        config = load_config(config_path=config_path, cli_dry_run=dry_run)
    except ConfigError as exc:
        print(f"[FATAL] 配置错误: {exc}")
        return 2

    logger = setup_logging(config.paths.log_file)
    logger.info("配置加载完成")

    state = StateStore(
        uid_state_file=config.paths.uid_state_file,
        group_gid_map_file=config.paths.group_gid_map_file,
        initial_uid_number=config.defaults.initial_uid_number,
    )

    if command == "init-state":
        if dry_run:
            print(f"[DRY-RUN] 将初始化: {config.paths.uid_state_file} 和 {config.paths.group_gid_map_file}")
            return 0
        state.ensure_state_files()
        print("状态文件初始化完成。")
        return 0

    state.ensure_state_files()
    ldap_client = LdapClient(config.ldap)
    if not config.behavior.dry_run:
        try:
            ldap_client.connect()
            logger.info("LDAP 连接成功")
        except LdapConnectionError as exc:
            print(f"[FATAL] LDAP 连接失败: {exc}")
            return 2

    service = UserService(config=config, state_store=state, ldap_client=ldap_client)
    try:
        if command == "interactive":
            try:
                run_interactive_create(
                    user_service=service,
                    default_base_group=config.defaults.base_group,
                    dry_run=config.behavior.dry_run,
                )
                return 0
            except (InputValidationError, AppError) as exc:
                print(f"[ERROR] 交互式执行失败: {exc}")
                return 1

        if command == "batch":
            if not input_path:
                print("[ERROR] batch 模式需要提供输入文件路径")
                return 1
            try:
                records = parse_input_file(input_path)
            except InputValidationError as exc:
                print(f"[ERROR] 输入文件校验失败: {exc}")
                return 1

            created = 0
            updated = 0
            skipped = 0
            failed = 0
            result_rows: List[Dict[str, str]] = []

            for idx, (record, raw) in enumerate(records, start=1):
                logger.info("处理第 %s 条: %s", idx, record.sam_account_name)
                try:
                    result = service.process_user(record, dry_run=config.behavior.dry_run)
                except (InputValidationError, AppError) as exc:
                    result = UserProcessResult(status="FAILED", reason=str(exc), raw=raw)

                if result.status == "CREATED":
                    created += 1
                elif result.status == "UPDATED":
                    updated += 1
                elif result.status in {"SKIPPED_EXISTS", "SKIPPED_NO_CHANGE"}:
                    skipped += 1
                else:
                    failed += 1

                result_rows.append(_result_to_row(raw, result))
                print(f"[{idx}/{len(records)}] {raw.get('用户名', '')} -> {result.status} {result.reason}")

                if result.status == "FAILED" and not continue_on_error:
                    break

            _write_batch_results(config.paths.batch_result_file, result_rows)
            total = len(result_rows)
            print(
                f"完成: total={total}, created={created}, updated={updated}, skipped={skipped}, failed={failed}, "
                f"result={config.paths.batch_result_file}"
            )
            return 1 if failed > 0 else 0
    finally:
        ldap_client.close()

    return 0


def run() -> int:
    parser = build_parser()
    args = parser.parse_args()
    dry_run = bool(getattr(args, "dry_run", False))
    input_path = getattr(args, "input", None)
    continue_on_error = _to_bool_text(getattr(args, "continue_on_error", "true"))
    return execute_command(
        command=args.command,
        config_path=args.config,
        dry_run=dry_run,
        input_path=input_path,
        continue_on_error=continue_on_error,
    )


if __name__ == "__main__":
    sys.exit(run())