# -*- coding: utf-8 -*-
"""
Reload ODS tasks by fixed time windows with optional sleep between windows.
"""
from __future__ import annotations

import argparse
import logging
import subprocess
import sys
import time as time_mod
from datetime import datetime, timedelta
from pathlib import Path
from zoneinfo import ZoneInfo

from dateutil import parser as dtparser

PROJECT_ROOT = Path(__file__).resolve().parents[1]
if str(PROJECT_ROOT) not in sys.path:
    sys.path.insert(0, str(PROJECT_ROOT))

from config.settings import AppConfig
from utils.logging_utils import build_log_path, configure_logging

MIN_RELOAD_WINDOW_DAYS = 30

def _parse_dt(value: str, tz: ZoneInfo, *, is_end: bool) -> datetime:
    raw = (value or "").strip()
    if not raw:
        raise ValueError("empty datetime")
    has_time = any(ch in raw for ch in (":", "T"))
    dt = dtparser.parse(raw)
    if dt.tzinfo is None:
        dt = dt.replace(tzinfo=tz)
    else:
        dt = dt.astimezone(tz)
    if not has_time:
        dt = dt.replace(hour=23 if is_end else 0, minute=59 if is_end else 0, second=59 if is_end else 0, microsecond=0)
    return dt


def _iter_windows(start: datetime, end: datetime, window_size: timedelta):
    if window_size.total_seconds() <= 0:
        raise ValueError("window_size must be > 0")
    cur = start
    while cur < end:
        nxt = min(cur + window_size, end)
        yield cur, nxt
        cur = nxt


def _run_task_window(
    task_code: str,
    window_start: datetime,
    window_end: datetime,
    api_page_size: int,
    api_timeout: int,
    logger: logging.Logger,
) -> None:
    cmd = [
        sys.executable,
        "-m",
        "cli.main",
        "--pipeline-flow",
        "FULL",
        "--tasks",
        task_code,
        "--window-start",
        window_start.strftime("%Y-%m-%d %H:%M:%S"),
        "--window-end",
        window_end.strftime("%Y-%m-%d %H:%M:%S"),
        "--force-window-override",
    ]
    if api_page_size > 0:
        cmd += ["--api-page-size", str(api_page_size)]
    if api_timeout > 0:
        cmd += ["--api-timeout", str(api_timeout)]
    logger.info(
        "RUN_TASK task=%s window_start=%s window_end=%s",
        task_code,
        window_start.isoformat(),
        window_end.isoformat(),
    )
    logger.debug("CMD %s", " ".join(cmd))
    subprocess.run(cmd, check=True, cwd=str(PROJECT_ROOT))


def main() -> int:
    ap = argparse.ArgumentParser(description="Reload ODS tasks by window slices.")
    ap.add_argument("--tasks", required=True, help="comma-separated ODS task codes")
    ap.add_argument("--start", required=True, help="start datetime, e.g. 2025-07-01")
    ap.add_argument("--end", default="", help="end datetime (default: now)")
    ap.add_argument("--window-days", type=int, default=1, help="days per window (default: 1)")
    ap.add_argument("--window-hours", type=int, default=0, help="hours per window (default: 0)")
    ap.add_argument("--sleep-seconds", type=float, default=0, help="sleep seconds after each window")
    ap.add_argument("--api-page-size", type=int, default=200, help="API page size override")
    ap.add_argument("--api-timeout", type=int, default=20, help="API timeout seconds override")
    ap.add_argument("--log-file", default="", help="log file path (default: logs/reload_ods_windowed_YYYYMMDD_HHMMSS.log)")
    ap.add_argument("--log-dir", default="", help="log directory (default: logs)")
    ap.add_argument("--log-level", default="INFO", help="log level (default: INFO)")
    ap.add_argument("--no-log-console", action="store_true", help="disable console logging")
    args = ap.parse_args()

    log_dir = Path(args.log_dir) if args.log_dir else (PROJECT_ROOT / "logs")
    log_file = Path(args.log_file) if args.log_file else build_log_path(log_dir, "reload_ods_windowed")
    log_console = not args.no_log_console

    with configure_logging(
        "reload_ods_windowed",
        log_file,
        level=args.log_level,
        console=log_console,
        tee_std=True,
    ) as logger:
        cfg = AppConfig.load({})
        tz = ZoneInfo(cfg.get("app.timezone", "Asia/Taipei"))

        start = _parse_dt(args.start, tz, is_end=False)
        end = datetime.now(tz) if not args.end else _parse_dt(args.end, tz, is_end=True)
        window_days = int(args.window_days)
        window_hours = int(args.window_hours)
        min_hours = MIN_RELOAD_WINDOW_DAYS * 24
        if window_hours > 0:
            if window_hours < min_hours:
                logger.warning(
                    "window_hours=%s too small; adjust to %s",
                    window_hours,
                    min_hours,
                )
                window_hours = min_hours
        elif window_days < MIN_RELOAD_WINDOW_DAYS:
            logger.warning(
                "window_days=%s too small; adjust to %s",
                window_days,
                MIN_RELOAD_WINDOW_DAYS,
            )
            window_days = MIN_RELOAD_WINDOW_DAYS
        window_size = timedelta(hours=window_hours) if window_hours > 0 else timedelta(days=window_days)

        task_codes = [t.strip().upper() for t in args.tasks.split(",") if t.strip()]
        if not task_codes:
            raise SystemExit("no tasks specified")

        logger.info(
            "START range=%s~%s window_days=%s window_hours=%s sleep=%.2f",
            start.isoformat(),
            end.isoformat(),
            window_days,
            window_hours,
            args.sleep_seconds,
        )

        for task_code in task_codes:
            logger.info("TASK_START task=%s", task_code)
            for window_start, window_end in _iter_windows(start, end, window_size):
                start_ts = time_mod.monotonic()
                _run_task_window(
                    task_code=task_code,
                    window_start=window_start,
                    window_end=window_end,
                    api_page_size=args.api_page_size,
                    api_timeout=args.api_timeout,
                    logger=logger,
                )
                elapsed = time_mod.monotonic() - start_ts
                logger.info(
                    "WINDOW_DONE task=%s window_start=%s window_end=%s elapsed=%.2fs",
                    task_code,
                    window_start.isoformat(),
                    window_end.isoformat(),
                    elapsed,
                )
                if args.sleep_seconds > 0:
                    logger.debug("SLEEP seconds=%.2f", args.sleep_seconds)
                    time_mod.sleep(args.sleep_seconds)
            logger.info("TASK_DONE task=%s", task_code)

    return 0


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