package synch

import (
	"testing"
)

// All expected digests verified against the live Python implementation on 2026-05-06:
//
//	PYTHONPATH=scripts:. python -c '
//	from sync_fio_to_sheets import generate_sync_id
//	cases = [
//	    {"date":"2026-01-15","amount":500.0,"currency":"CZK","sender":"Jan Novak","vs":"123","message":"clenske 1/2026","bank_id":"abc123"},
//	    {"date":"2026-01-15","amount":500.0,"sender":"Jan Novak","vs":"123","message":"clenske 1/2026","bank_id":"abc123"},
//	    {"date":"2026-02-10","amount":1234.56,"currency":"CZK","sender":"ABC SRO","vs":"","message":"FAKTURA 42","bank_id":"xyz"},
//	    {"date":"2026-03-01","amount":-500.0,"currency":"CZK","sender":"refund","vs":"","message":"","bank_id":""},
//	    {"date":"2026-04-01","amount":0.0,"currency":"CZK","sender":"","vs":"","message":"","bank_id":""},
//	    {"date":"","amount":0.0,"currency":"CZK","sender":"","vs":"","message":"","bank_id":""},
//	]
//	for c in cases: print(generate_sync_id(c))
//	'
func TestGenerateSyncID(t *testing.T) {
	t.Parallel()

	cases := []struct {
		name string
		tx   Transaction
		want string
	}{
		{
			name: "all fields set",
			tx: Transaction{
				Date: "2026-01-15", Amount: 500.0, Currency: "CZK",
				Sender: "Jan Novak", VS: "123", Message: "clenske 1/2026", BankID: "abc123",
			},
			want: "4ac26598b6f23965380690172156a438a7e97a97dcedf222e5afe1afbe2c1bc4",
		},
		{
			name: "currency empty defaults to CZK",
			tx: Transaction{
				Date: "2026-01-15", Amount: 500.0, Currency: "",
				Sender: "Jan Novak", VS: "123", Message: "clenske 1/2026", BankID: "abc123",
			},
			want: "4ac26598b6f23965380690172156a438a7e97a97dcedf222e5afe1afbe2c1bc4",
		},
		{
			name: "mixed-case fields lowercased before hashing",
			tx: Transaction{
				Date: "2026-02-10", Amount: 1234.56, Currency: "CZK",
				Sender: "ABC SRO", VS: "", Message: "FAKTURA 42", BankID: "xyz",
			},
			want: "d40fa224d4fa572ffcd58e308e5c6508c4d5ca087b24ef6ff9284528fc128250",
		},
		{
			name: "negative amount",
			tx: Transaction{
				Date: "2026-03-01", Amount: -500.0, Currency: "CZK",
				Sender: "refund", VS: "", Message: "", BankID: "",
			},
			want: "0c630a407160367c396a2beec08efb94c319b4d84a8b90cc2be89e6ea10c391f",
		},
		{
			name: "zero amount",
			tx: Transaction{
				Date: "2026-04-01", Amount: 0.0, Currency: "CZK",
				Sender: "", VS: "", Message: "", BankID: "",
			},
			want: "6a23ce53717cd539064d550d2c2ec5de2e9bf81016d16852820ca9b8e259331f",
		},
		{
			// Python equivalent: {"date":"","amount":0.0,"currency":"CZK","sender":"","vs":"","message":"","bank_id":""}
			// Note: Python generate_sync_id({}) hashes "" for missing amount, not "0.0".
			name: "zero-value Transaction",
			tx:   Transaction{},
			want: "d33d7e391f5a43f0192bb5a34c0ec15715139125678ecef8e1324af7d943b21d",
		},
	}

	for _, tc := range cases {
		t.Run(tc.name, func(t *testing.T) {
			t.Parallel()
			got := GenerateSyncID(tc.tx)
			if got != tc.want {
				t.Errorf("GenerateSyncID(%+v) = %q, want %q", tc.tx, got, tc.want)
			}
		})
	}
}

// All expected strings verified against the live Python implementation on 2026-05-06:
//
//	PYTHONPATH=scripts:. python -c '
//	for v in [0.0, 500.0, -500.0, 0.1, 1234.56, 99999.99, 1500000.0, 1e16, 1e-5]:
//	    print(repr(v), "->", repr(str(v)))
//	'
func TestFormatAmount(t *testing.T) {
	t.Parallel()

	cases := []struct {
		in   float64
		want string
	}{
		{0.0, "0.0"},
		{500.0, "500.0"},
		{-500.0, "-500.0"},
		{0.1, "0.1"},
		{1234.56, "1234.56"},
		{99999.99, "99999.99"},
		{1500000.0, "1500000.0"},
		{1e16, "1e+16"},
		{1e-5, "1e-05"},
	}

	for _, tc := range cases {
		got := formatAmount(tc.in)
		if got != tc.want {
			t.Errorf("formatAmount(%v) = %q, want %q", tc.in, got, tc.want)
		}
	}
}