#!/usr/bin/env python3
"""
Israeli Small Claims Court Filing Fee Calculator

Calculates the filing fee (agrah, אגרה) for Israeli small claims court
based on the claim amount. Under regulation 6(a) of the Small Claims
Procedure Regulations 1976 the fee is 1% of the claim amount, rounded up
to a multiple of NIS 5, with a minimum of NIS 50.

Usage:
    python scripts/filing-fee-calculator.py --amount 15000
    python scripts/filing-fee-calculator.py --amount 3000
    python scripts/filing-fee-calculator.py --amount 39900

Small claims court in Israel handles claims up to NIS 39,900.
For claims exceeding this amount, the case must be filed in
Magistrate Court (Beit Mishpat Shalom).
"""

import argparse
import math
import sys


# Constants
SMALL_CLAIMS_MAX = 39900  # Maximum claim amount in NIS (as of January 2026)
MINIMUM_FEE = 50  # Minimum filing fee in NIS
FEE_PERCENTAGE = 0.01  # 1% of claim amount


def calculate_filing_fee(amount: float) -> dict:
    """
    Calculate the filing fee for a given claim amount.

    Returns a dictionary with fee details.
    """
    if not math.isfinite(amount) or amount <= 0:
        return {"error": True, "message": "Claim amount must be a positive, finite number."}

    exceeds_limit = amount > SMALL_CLAIMS_MAX

    # Calculate fee (still calculate even if exceeds limit, for informational purposes)
    capped_amount = min(amount, SMALL_CLAIMS_MAX)
    calculated_fee = capped_amount * FEE_PERCENTAGE
    # Reg. 6(a)(3): round the 1% amount UP to a multiple of NIS 5.
    # Work in whole agorot to avoid float artefacts (e.g. 8,000.50 -> 80.005 -> 85).
    claim_agorot = round(capped_amount * 100)
    rounded_fee = -(-claim_agorot // 50000) * 5  # ceil(claim_agorot / 100 / 100 / 5) * 5
    actual_fee = max(rounded_fee, MINIMUM_FEE)

    return {
        "error": False,
        "claim_amount": amount,
        "exceeds_limit": exceeds_limit,
        "small_claims_max": SMALL_CLAIMS_MAX,
        "calculated_fee_raw": calculated_fee,
        "actual_fee": actual_fee,
        "minimum_applied": calculated_fee < MINIMUM_FEE,
    }


def main():
    parser = argparse.ArgumentParser(
        description=(
            "Calculate the filing fee for Israeli small claims court "
            "(Beit Mishpat LeTvi'ot Ktanot). Fee is 1% of claim amount, "
            "rounded up to a multiple of NIS 5, minimum NIS 50."
        ),
        epilog=(
            "Examples:\n"
            "  python filing-fee-calculator.py --amount 15000\n"
            "  python filing-fee-calculator.py --amount 3000\n"
            "  python filing-fee-calculator.py --amount 39900\n"
            "\n"
            "Small claims court maximum: NIS 39,900 (as of January 2026).\n"
            "For larger claims, file in Magistrate Court (Beit Mishpat Shalom)."
        ),
        formatter_class=argparse.RawDescriptionHelpFormatter,
    )

    parser.add_argument(
        "--amount",
        type=float,
        required=True,
        help="Claim amount in NIS",
    )

    args = parser.parse_args()

    # Validate
    if not math.isfinite(args.amount) or args.amount <= 0:
        print("Error: Claim amount must be a positive number.")
        sys.exit(1)

    result = calculate_filing_fee(args.amount)

    if result.get("error"):
        print(f"Error: {result['message']}")
        sys.exit(1)

    # Display results
    print("\n" + "=" * 60)
    print("  Small Claims Court Filing Fee Calculator")
    print("  מחשבון אגרת הגשה לבית משפט לתביעות קטנות")
    print("=" * 60)

    print(f"\n  Claim Amount (סכום תביעה):          {result['claim_amount']:,.2f} NIS")
    print(f"  Small Claims Maximum:                {result['small_claims_max']:,} NIS")

    if result['exceeds_limit']:
        print(f"\n  WARNING (אזהרה):")
        print(f"  Your claim of {result['claim_amount']:,.2f} NIS EXCEEDS the small claims")
        print(f"  court limit of {result['small_claims_max']:,} NIS.")
        print(f"\n  Options:")
        print(f"  1. Reduce claim to {result['small_claims_max']:,} NIS (waive the excess)")
        print(f"  2. File in Magistrate Court (Beit Mishpat Shalom) for full amount")
        print(f"\n  If you reduce to {result['small_claims_max']:,} NIS:")

    print(f"\n  Fee Calculation:")
    print(f"  {'=' * 50}")

    if result['minimum_applied']:
        print(f"  1% of {min(result['claim_amount'], SMALL_CLAIMS_MAX):,.2f} = {result['calculated_fee_raw']:.4f} NIS")
        print(f"  Minimum fee applies: {MINIMUM_FEE} NIS")
        print(f"\n  Filing Fee (אגרת הגשה):              {result['actual_fee']} NIS")
    else:
        print(f"  1% of {min(result['claim_amount'], SMALL_CLAIMS_MAX):,.2f} = {result['calculated_fee_raw']:.4f} NIS, rounded up to a multiple of 5 = {result['actual_fee']} NIS")
        print(f"\n  Filing Fee (אגרת הגשה):              {result['actual_fee']} NIS")

    # Additional cost summary
    print(f"\n  Cost Summary:")
    print(f"  {'=' * 50}")
    print(f"  Filing fee:                          {result['actual_fee']} NIS")
    print(f"  If you lose: the court usually orders the loser to pay costs,")
    print(f"  typically about NIS 300-400 (sometimes more).")

    # Helpful information
    print(f"\n  Filing Information:")
    print(f"  {'=' * 50}")
    print(f"  Where to file: Judicial Authority site (online) or the court clerk's office (3 copies)")
    print(f"  Online filing: Judicial Authority site, national digital identification")
    print(f"  Cannot afford the fee: file a fee-exemption request (clerk or Net HaMishpat)")
    print(f"  Counterclaim or third-party notice: same fee calculation applies")

    if not result['exceeds_limit']:
        print(f"\n  Potential recovery if you win:")
        print(f"  {'=' * 50}")
        print(f"  Claim amount:                        {result['claim_amount']:,.2f} NIS")
        print(f"  Filing fee (usually awarded, not guaranteed): {result['actual_fee']} NIS")
        print(f"  Court costs (at judge's discretion):  Variable")

    print(f"\n  DISCLAIMER (הערה חשובה):")
    print(f"  Fee amounts are based on regulations as of January 2026.")
    print(f"  Verify current fee with the court or gov.il before filing.")
    print(f"  The small claims maximum (NIS 39,900) is updated periodically.")
    print()


if __name__ == "__main__":
    main()