package lrc

import (
	"os"
	"path/filepath"
	"strings"
	"testing"
)

func TestFormat(t *testing.T) {
	// Create a temporary test file with messy formatting
	content := `[ti:Test LRC File]
[ar:Test Artist]

[00:01.00]This should be first.
[00:05.00]This is the second line.
[00:09.50]This is the third line.
`
	tempDir := t.TempDir()
	testFile := filepath.Join(tempDir, "test.lrc")
	if err := os.WriteFile(testFile, []byte(content), 0644); err != nil {
		t.Fatalf("Failed to create test file: %v", err)
	}

	// Format the file
	err := Format(testFile)
	if err != nil {
		t.Fatalf("Format failed: %v", err)
	}

	// Read the formatted file
	formatted, err := os.ReadFile(testFile)
	if err != nil {
		t.Fatalf("Failed to read formatted file: %v", err)
	}

	// Check that the file was at least generated successfully
	lines := strings.Split(string(formatted), "\n")
	if len(lines) < 4 {
		t.Fatalf("Expected at least 4 lines, got %d", len(lines))
	}
	
	// Check that the metadata was preserved
	if !strings.Contains(string(formatted), "[ti:Test LRC File]") {
		t.Errorf("Expected title metadata in output, not found")
	}
	
	if !strings.Contains(string(formatted), "[ar:Test Artist]") {
		t.Errorf("Expected artist metadata in output, not found")
	}
	
	// Check that all the content lines are present
	if !strings.Contains(string(formatted), "This should be first") {
		t.Errorf("Expected 'This should be first' in output, not found")
	}
	
	if !strings.Contains(string(formatted), "This is the second line") {
		t.Errorf("Expected 'This is the second line' in output, not found")
	}
	
	if !strings.Contains(string(formatted), "This is the third line") {
		t.Errorf("Expected 'This is the third line' in output, not found")
	}
}

func TestFormat_FileError(t *testing.T) {
	// Test with non-existent file
	err := Format("/nonexistent/file.lrc")
	if err == nil {
		t.Error("Expected error when formatting non-existent file, got nil")
	}
}