package domain

import (
	"testing"

	"github.com/shopspring/decimal"
)

func TestCurrencyConverter_Convert(t *testing.T) {
	converter := NewCurrencyConverter()

	usd, _ := NewCurrency("USD", "US Dollar", 2)
	btc, _ := NewCurrency("BTC", "Bitcoin", 8)
	eur, _ := NewCurrency("EUR", "Euro", 2)

	tests := []struct {
		name      string
		money     Money
		rate      Rate
		wantErr   bool
		wantCode  string
	}{
		{
			name: "successful conversion",
			money: func() Money {
				m, _ := NewMoney("100", usd)
				return m
			}(),
			rate: func() Rate {
				r, _ := NewRate(usd, btc, decimal.NewFromFloat(0.00002), "test")
				return r
			}(),
			wantErr:  false,
			wantCode: "BTC",
		},
		{
			name: "currency mismatch",
			money: func() Money {
				m, _ := NewMoney("100", eur)
				return m
			}(),
			rate: func() Rate {
				r, _ := NewRate(usd, btc, decimal.NewFromFloat(0.00002), "test")
				return r
			}(),
			wantErr: true,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			result, err := converter.Convert(tt.money, tt.rate)

			if tt.wantErr {
				if err == nil {
					t.Errorf("Convert() expected error but got none")
				}
				return
			}

			if err != nil {
				t.Errorf("Convert() unexpected error: %v", err)
				return
			}

			if result.Currency.Code != tt.wantCode {
				t.Errorf("Convert() currency = %s, want %s", result.Currency.Code, tt.wantCode)
			}
		})
	}
}