"""
main.py — Entry point for the Factors.AI account-export automation.

Usage
─────
    python main.py                # uses settings in config.py / .env
    python main.py --visible      # opens a real browser window (debug)
    python main.py --dry-run      # skip email; just download & compare

Schedule (cron example — runs every day at 8 AM)
─────────────────────────────────────────────────
    0 8 * * * /path/to/venv/bin/python /path/to/factors_automation/main.py
"""
import argparse
import logging
import shutil
import sys
from pathlib import Path

# ── Logging (set up before any other import) ──────────────────────────────────
from config import LOG_PATH   # noqa: E402 – needs to be early

logging.basicConfig(
    level=logging.INFO,
    format="%(asctime)s  [%(levelname)-8s]  %(name)s — %(message)s",
    datefmt="%Y-%m-%d %H:%M:%S",
    handlers=[
        logging.StreamHandler(sys.stdout),
        logging.FileHandler(str(LOG_PATH), encoding="utf-8"),
    ],
)
logger = logging.getLogger(__name__)

# ── Application imports ───────────────────────────────────────────────────────
from config import (         # noqa: E402
    FACTORS_EMAIL,
    FACTORS_PASSWORD,
    TARGET_PROJECT,
    TEMP_DOWNLOAD_DIR,
    LAST_CSV_PATH,
    SMTP_HOST,
    SMTP_PORT,
    SENDER_EMAIL,
    SENDER_PASSWORD,
    RECIPIENT_EMAILS,
    FIELDS_TO_SELECT,
    HEADLESS,
)
from scraper    import FactorsAIScraper
from comparator import find_new_entries
from mailer     import send_alert


# ── CLI arguments ─────────────────────────────────────────────────────────────

def _parse_args() -> argparse.Namespace:
    p = argparse.ArgumentParser(description="Factors.AI account-export automation")
    p.add_argument(
        "--visible",
        action="store_true",
        help="Open a real browser window instead of running headless",
    )
    p.add_argument(
        "--dry-run",
        action="store_true",
        help="Download and compare but do NOT send the email",
    )
    return p.parse_args()


# ── Main flow ─────────────────────────────────────────────────────────────────

def main() -> None:
    args     = _parse_args()
    headless = HEADLESS and not args.visible

    logger.info("=" * 65)
    logger.info("  Factors.AI Account Export Automation  —  START")
    logger.info(f"  headless={headless}   dry_run={args.dry_run}")
    logger.info("=" * 65)

    # ── Step 1 ─ Download CSV via Selenium ────────────────────────────────────
    logger.info("STEP 1: Downloading CSV …")
    scraper = FactorsAIScraper(
        download_dir=str(TEMP_DOWNLOAD_DIR),
        headless=headless,
    )
    downloaded_csv = scraper.run(
        email=FACTORS_EMAIL,
        password=FACTORS_PASSWORD,
        target_project=TARGET_PROJECT,
        fields_to_select=FIELDS_TO_SELECT,
    )
    logger.info(f"  Downloaded → {downloaded_csv}")

    # ── Step 2 ─ Compare with last export ────────────────────────────────────
    logger.info("STEP 2: Comparing with previous export …")
    last_csv = str(LAST_CSV_PATH) if LAST_CSV_PATH.exists() else None
    new_entries, is_first_run = find_new_entries(downloaded_csv, last_csv)

    if new_entries.empty and not is_first_run:
        logger.info("  ✓ No new entries found — nothing to mail.")
    else:
        count = len(new_entries)
        tag   = "(first run — all entries)" if is_first_run else f"({count} new)"
        logger.info(f"  ✓ New entries detected {tag}")

        # ── Step 3 ─ Send email ───────────────────────────────────────────────
        if args.dry_run:
            logger.info("STEP 3: [DRY RUN] Email skipped.")
            logger.info(new_entries.to_string())
        else:
            logger.info("STEP 3: Sending alert email …")
            send_alert(
                smtp_host=SMTP_HOST,
                smtp_port=SMTP_PORT,
                sender_email=SENDER_EMAIL,
                sender_password=SENDER_PASSWORD,
                recipients=RECIPIENT_EMAILS,
                new_entries=new_entries,
                is_first_run=is_first_run,
                downloaded_csv=downloaded_csv
            )
            logger.info("  ✓ Email sent.")

    # ── Step 4 ─ Persist the new CSV as last_export.csv ─────────────────────
    logger.info(f"STEP 4: Saving export as last_export.csv → {LAST_CSV_PATH}")
    shutil.copy2(downloaded_csv, str(LAST_CSV_PATH))

    logger.info("=" * 65)
    logger.info("  Automation complete ✓")
    logger.info("=" * 65)


if __name__ == "__main__":
    main()