"""Entry point to start the local Motor-CAD task executor (P4-M2 / P5-M2).

Usage:
    python scripts/run_task_executor.py [--config path] [--instances N]
                                        [--interval N] [--mock]
                                        [--log-dir dir] [--log-level LVL]

Configuration is loaded from executor_config.json (see executor_config.py
for the lookup order and env-var overrides). This single entry point can
launch N parallel executor instances via config["instances"] or --instances.

NOTE: All strings must be ASCII only.
"""
import argparse
import logging
import os
import sys
import time
from datetime import datetime

_SCRIPTS_DIR = os.path.dirname(os.path.abspath(__file__))
if _SCRIPTS_DIR not in sys.path:
    sys.path.insert(0, _SCRIPTS_DIR)

import executor_config  # noqa: E402
from task_executor import MotorCADTaskExecutor  # noqa: E402


def setup_logging(log_dir, level_name):
    """Configure a file + console logger for the executor."""
    os.makedirs(log_dir, exist_ok=True)
    log_file = os.path.join(
        log_dir, "executor_%s.log" % datetime.now().strftime("%Y%m%d_%H%M%S")
    )
    logging.basicConfig(
        level=getattr(logging, level_name, logging.INFO),
        format="%(asctime)s %(levelname)s %(message)s",
        handlers=[
            logging.FileHandler(log_file, encoding="utf-8"),
            logging.StreamHandler(),
        ],
    )
    return log_file


def make_log_callback(kind):
    """Return an executor callback that logs and echoes to console."""
    logger = logging.getLogger("executor")

    def _cb(*args):
        msg = " ".join(str(a) for a in args)
        if kind == "progress":
            logger.info("%s", msg)
        elif kind == "complete":
            logger.info("%s", msg)
        else:
            logger.error("%s", msg)
        print(msg, flush=True)

    return _cb


def build_executors(cfg):
    """Create cfg['instances'] MotorCADTaskExecutor objects."""
    multi = cfg["instances"] > 1
    executors = []
    for i in range(cfg["instances"]):
        ex = MotorCADTaskExecutor(
            web_base_url=cfg["web_base_url"],
            model_path=cfg["model_path"],
            enable_mock=cfg["enable_mock"],
            tool=cfg["tool"],
            enable_thermal=cfg["enable_thermal"],
            ambient_temperature=cfg["ambient_temperature"],
            executor_id=("motorcad-executor-%s" % i) if multi else None,
            on_progress=make_log_callback("progress"),
            on_complete=make_log_callback("complete"),
            on_error=make_log_callback("error"),
        )
        executors.append(ex)
    return executors


def main():
    parser = argparse.ArgumentParser(prog="pcb-afm-executor")
    parser.add_argument("--version", action="store_true",
                        help="print version and exit")
    parser.add_argument("--self-test", action="store_true",
                        help="run a mock single-point execution and exit "
                             "(no web backend, no Motor-CAD)")
    parser.add_argument("--config", default=None,
                        help="path to executor_config.json")
    parser.add_argument("--instances", type=int, default=None,
                        help="parallel executor count (overrides config)")
    parser.add_argument("--interval", type=int, default=None,
                        help="poll interval seconds (overrides config)")
    parser.add_argument("--mock", action="store_true",
                        help="use mock solver (no Motor-CAD)")
    parser.add_argument("--log-dir", default=None,
                        help="log output dir (overrides config)")
    parser.add_argument("--log-level", default=None,
                        help="log level (overrides config)")
    args = parser.parse_args()

    if args.version:
        print("PCB-AFM Executor 1.1.0 (platform P5-M2, configurable)")
        return
    if args.self_test:
        import tempfile
        from task_executor import TaskExecutor
        _ex = TaskExecutor(task_dir=tempfile.mkdtemp(prefix="selftest_"),
                           enable_mock=True)
        _ex.dispatch_task = lambda tid: True
        _captured = {}
        _ex.on_complete = lambda tid, res, met: _captured.update(
            {tid: (len(res), res[0].get("status") if res else None)})
        _ex.execute_task({
            "task_id": "selftest-1",
            "parameters": [{"airgap_mm": 1.0, "point_id": 1}],
        })
        _n, _st = _captured.get("selftest-1", (0, None))
        print("self-test OK: %d point(s), status=%s" % (_n, _st))
        return

    # Load configuration (CLI / env / config file / defaults).
    cfg = executor_config.load_config(cli_path=args.config)
    if args.instances is not None:
        cfg["instances"] = args.instances
    if args.interval is not None:
        cfg["poll_interval"] = args.interval
    if args.mock:
        cfg["enable_mock"] = True
    if args.log_dir:
        cfg["log_dir"] = args.log_dir
    if args.log_level:
        cfg["log_level"] = args.log_level
    executor_config.validate_config(cfg)

    log_file = setup_logging(cfg["log_dir"], cfg["log_level"])
    logger = logging.getLogger("executor")
    logger.info("config source: %s", cfg["config_source"])
    logger.info("model=%s", cfg["model_path"])
    logger.info("web_base_url=%s", cfg["web_base_url"])
    logger.info("instances=%s poll_interval=%s tool=%s mock=%s log=%s",
                cfg["instances"], cfg["poll_interval"], cfg["tool"],
                cfg["enable_mock"], log_file)

    executors = build_executors(cfg)
    threads = []
    for ex in executors:
        threads.append(ex.start_polling(interval=int(cfg["poll_interval"])))
        logger.info("executor started: %s", ex.executor_id)

    print("Task executor started. Model=%s" % cfg["model_path"], flush=True)
    print("Web base URL: %s" % cfg["web_base_url"], flush=True)
    print("Ctrl+C to stop.", flush=True)
    try:
        while any(t.is_alive() for t in threads):
            time.sleep(1)
    except KeyboardInterrupt:
        for ex in executors:
            ex.stop()
            ex.cleanup()
        logger.info("All executors stopped.")
        print("Executor stopped.", flush=True)


if __name__ == "__main__":
    main()