package app

import "testing"

func TestCalculateAIPointCost(t *testing.T) {
	t.Parallel()

	tests := []struct {
		name      string
		chars     int
		baseChars int
		want      int
	}{
		{name: "empty still charges base usage", chars: 0, baseChars: 1000, want: 1},
		{name: "single char", chars: 1, baseChars: 1000, want: 1},
		{name: "first base boundary", chars: 1000, baseChars: 1000, want: 2},
		{name: "over first base", chars: 1001, baseChars: 1000, want: 2},
		{name: "second base boundary", chars: 2000, baseChars: 1000, want: 3},
		{name: "over second base", chars: 2001, baseChars: 1000, want: 3},
		{name: "default base chars", chars: 1000, baseChars: 0, want: 2},
		{name: "custom base chars", chars: 1500, baseChars: 500, want: 4},
	}

	for _, tt := range tests {
		tt := tt
		t.Run(tt.name, func(t *testing.T) {
			t.Parallel()
			if got := calculateAIPointCost(tt.chars, tt.baseChars); got != tt.want {
				t.Fatalf("calculateAIPointCost(%d, %d) = %d, want %d", tt.chars, tt.baseChars, got, tt.want)
			}
		})
	}
}