package vtt

import (
	"fmt"
	"testing"

	"sub-cli/internal/model"
)

func TestParseVTTTimestamp(t *testing.T) {
	testCases := []struct {
		input    string
		expected model.Timestamp
	}{
		// Standard format
		{"00:00:01.000", model.Timestamp{Hours: 0, Minutes: 0, Seconds: 1, Milliseconds: 0}},
		// Without leading zeros
		{"0:0:1.0", model.Timestamp{Hours: 0, Minutes: 0, Seconds: 1, Milliseconds: 0}},
		// Different millisecond formats
		{"00:00:01.1", model.Timestamp{Hours: 0, Minutes: 0, Seconds: 1, Milliseconds: 100}},
		{"00:00:01.12", model.Timestamp{Hours: 0, Minutes: 0, Seconds: 1, Milliseconds: 120}},
		{"00:00:01.123", model.Timestamp{Hours: 0, Minutes: 0, Seconds: 1, Milliseconds: 123}},
		// Long milliseconds (should truncate)
		{"00:00:01.1234", model.Timestamp{Hours: 0, Minutes: 0, Seconds: 1, Milliseconds: 123}},
		// Unusual but valid format
		{"01:02:03.456", model.Timestamp{Hours: 1, Minutes: 2, Seconds: 3, Milliseconds: 456}},
		// Invalid format (should return a zero timestamp)
		{"invalid", model.Timestamp{Hours: 0, Minutes: 0, Seconds: 0, Milliseconds: 0}},
	}
	
	for _, tc := range testCases {
		t.Run(fmt.Sprintf("Timestamp_%s", tc.input), func(t *testing.T) {
			result := parseVTTTimestamp(tc.input)
			if result != tc.expected {
				t.Errorf("parseVTTTimestamp(%s) = %+v, want %+v", tc.input, result, tc.expected)
			}
		})
	}
}