import os
import sys
from datetime import datetime

# Ensure project root is on PYTHONPATH when running from scripts/
project_root = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
if project_root not in sys.path:
    sys.path.insert(0, project_root)

from app_core.config.settings import AppSettings
from app_core.db.database import engine
from sqlalchemy import text


def check_env(settings: AppSettings) -> list[str]:
    missing: list[str] = []
    required = [
        ("DATABASE_URL", settings.database_url or os.getenv("DATABASE_URL")),
        ("SMTP_HOST", settings.smtp_host),
        ("SMTP_PORT", settings.smtp_port),
        ("SMTP_USER", settings.smtp_user),
        ("SMTP_PASSWORD", settings.smtp_password),
        ("SMTP_FROM_EMAIL", settings.smtp_from_email),
        ("REPORT_RECIPIENTS", settings.report_recipients or os.getenv("REPORT_RECIPIENTS")),
    ]
    for key, val in required:
        if not val:
            missing.append(key)
    return missing


def check_db_connection() -> tuple[bool, str | None]:
    try:
        with engine.connect() as conn:
            # SQLAlchemy 2.0: wrap SQL in text() or use exec_driver_sql
            conn.execute(text("SELECT 1"))
        return True, None
    except Exception as e:
        return False, str(e)


def check_smtp_login(s: AppSettings) -> tuple[bool, str | None]:
    import smtplib

    try:
        server = smtplib.SMTP(s.smtp_host, s.smtp_port, timeout=20)
        if s.smtp_use_tls:
            server.starttls()
        if s.smtp_user and s.smtp_password:
            server.login(s.smtp_user, s.smtp_password)
        # Probe NOOP and quit without sending
        server.noop()
        server.quit()
        return True, None
    except Exception as e:
        return False, str(e)


def main() -> int:
    print("=== Workolik Production Validation ===")
    settings = AppSettings()

    # 1) Environment variables
    missing = check_env(settings)
    if missing:
        print("❌ Missing required env vars:", ", ".join(sorted(set(missing))))
    else:
        print("✅ Required env vars present")

    # Optional BCC
    bcc = os.getenv("BCC_RECIPIENTS", "").strip()
    if bcc:
        print(f"✅ BCC_RECIPIENTS set: {bcc}")
    else:
        print("ℹ️ BCC_RECIPIENTS not set (no BCC will be added)")

    # 2) Database connectivity
    ok_db, err_db = check_db_connection()
    if ok_db:
        print("✅ Database connectivity OK")
    else:
        print(f"❌ Database connectivity FAILED: {err_db}")

    # 3) SMTP connectivity (no email will be sent)
    ok_smtp, err_smtp = check_smtp_login(settings)
    if ok_smtp:
        print("✅ SMTP login OK (no email sent)")
    else:
        print(f"❌ SMTP login FAILED: {err_smtp}")

    # 4) Scheduler subject check (ensure dedupe matches)
    today_str = datetime.now().date().strftime('%Y-%m-%d')
    expected_subject = f"Daily Digest - {today_str}"
    print(f"✅ Scheduler dedupe subject pattern: {expected_subject}")

    failures = (1 if missing else 0) + (0 if ok_db else 1) + (0 if ok_smtp else 1)
    print("=== Validation Complete ===")
    return 0 if failures == 0 else 1


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