import sys
import argparse
from typing import List, Optional
from redminelib.resources import Issue
from .config import Config
from .client import fetch_issues_by_time_entries
from .formatter import format_compact, format_table


def parse_date_range(date_arg: str) -> tuple[str, str]:
    if "--" not in date_arg:
        raise ValueError("Date range must be in format YYYY-MM-DD--YYYY-MM-DD")
    parts = date_arg.split("--", 1)
    if len(parts) != 2:
        raise ValueError("Invalid date range format")
    return parts[0].strip(), parts[1].strip()


def main(argv: Optional[List[str]] = None) -> int:
    parser = argparse.ArgumentParser(
        prog="redmine-reporter",
        description="Generate Redmine issue report based on your time entries."
    )
    parser.add_argument(
        "--date",
        default=Config.get_default_date_range(),
        # help="Date range in format YYYY-MM-DD--YYYY-MM-DD (default: %(default)s)"
        help="Date range in format YYYY-MM-DD--YYYY-MM-DD (default from .env or %(default)s)"
    )
    parser.add_argument(
        "--compact",
        action="store_true",
        help="Use compact plain-text output instead of table"
    )
    args = parser.parse_args(argv)

    try:
        Config.validate()
    except ValueError as e:
        print(f"❌ Configuration error: {e}", file=sys.stderr)
        return 1

    try:
        from_date, to_date = parse_date_range(args.date)
    except ValueError as e:
        print(f"❌ Date error: {e}", file=sys.stderr)
        return 1

    try:
        issues = fetch_issues_by_time_entries(from_date, to_date)
    except Exception as e:
        print(f"❌ Redmine API error: {e}", file=sys.stderr)
        return 1

    if issues is None:
        print("ℹ️  No time entries found in the given period.", file=sys.stderr)
        return 0

    print(f"✅ Total issues: {len(issues)} [{args.date}]")

    try:
        if args.compact:
            output = format_compact(issues)
        else:
            output = format_table(issues)
        print(output)
    except Exception as e:
        print(f"❌ Formatting error: {e}", file=sys.stderr)
        return 1

    return 0


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