package libgofunc

import (
	"math"
	"testing"
)

func TestDiv(t *testing.T) {
	tests := []struct {
		name string
		a    any
		b    any
		want float64
	}{
		{"Float division", 10.5, 2.0, 5.25},
		{"Float division", 4975, 1000, 4.975},
		{"Integer division", 10, 4, 2.5},
		{"Mixed types", int64(100), float64(4.0), 25.0},
		{"Division by zero (float)", 10.0, 0.0, 0.0},
		{"Division by zero (int)", 5, 0, 0.0},
		{"Unsupported type defaults to zero", "string", 2, 0.0},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			got := Div(tt.a, tt.b)
			if got != tt.want {
				t.Errorf("TemplateDiv() = %v, want %v", got, tt.want)
			}
		})
	}
}

func TestFormatNumber(t *testing.T) {
	tests := []struct {
		name      string
		precision int
		val       any
		want      string
	}{
		{"Standard float with commas", 2, 1234567.891, "1,234,567.89"},
		{"Standard float with commas", 3, 4.975, "4.975"},
		{"Integer input with commas", 0, 5000000, "5,000,000"},
		{"Integer input forced decimals", 2, 5000, "5,000.00"},
		{"Negative float commas", 2, -9876543.21, "-9,876,543.21"},
		{"Small float rounding up", 2, 0.128, "0.13"},
		{"Small float rounding down", 2, 0.123, "0.12"},
		{"Handling NaN", 2, math.NaN(), ""},
		{"Handling Inf", 2, math.Inf(1), ""},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			got := FormatNumber(tt.precision, tt.val)
			if got != tt.want {
				t.Errorf("TemplateFloat() = %q, want %q", got, tt.want)
			}
		})
	}
}