package lrc

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

	"sub-cli/internal/model"
)

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

[00:01.00]This is the first line.
[00:05.00]This is the second 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)
	}

	// Convert to subtitle
	subtitle, err := ConvertToSubtitle(testFile)
	if err != nil {
		t.Fatalf("ConvertToSubtitle failed: %v", err)
	}

	// Check result
	if subtitle.Format != "lrc" {
		t.Errorf("Expected format 'lrc', got '%s'", subtitle.Format)
	}

	if len(subtitle.Entries) != 2 {
		t.Errorf("Expected 2 entries, got %d", len(subtitle.Entries))
	}

	// Check first entry
	if subtitle.Entries[0].StartTime.Hours != 0 || subtitle.Entries[0].StartTime.Minutes != 0 ||
		subtitle.Entries[0].StartTime.Seconds != 1 || subtitle.Entries[0].StartTime.Milliseconds != 0 {
		t.Errorf("First entry start time: expected 00:01.00, got %+v", subtitle.Entries[0].StartTime)
	}

	if subtitle.Entries[0].Text != "This is the first line." {
		t.Errorf("First entry text: expected 'This is the first line.', got '%s'", subtitle.Entries[0].Text)
	}

	// Check metadata conversion
	if subtitle.Title != "Test LRC File" {
		t.Errorf("Expected title 'Test LRC File', got '%s'", subtitle.Title)
	}

	if subtitle.Metadata["ar"] != "Test Artist" {
		t.Errorf("Expected artist metadata 'Test Artist', got '%s'", subtitle.Metadata["ar"])
	}
}

func TestConvertFromSubtitle(t *testing.T) {
	// Create a subtitle
	subtitle := model.NewSubtitle()
	subtitle.Format = "lrc"
	subtitle.Title = "Test LRC File"
	subtitle.Metadata["ar"] = "Test Artist"
	
	entry1 := model.NewSubtitleEntry()
	entry1.Index = 1
	entry1.StartTime = model.Timestamp{Hours: 0, Minutes: 0, Seconds: 1, Milliseconds: 0}
	entry1.EndTime = model.Timestamp{Hours: 0, Minutes: 0, Seconds: 4, Milliseconds: 0}
	entry1.Text = "This is the first line."
	
	entry2 := model.NewSubtitleEntry()
	entry2.Index = 2
	entry2.StartTime = model.Timestamp{Hours: 0, Minutes: 0, Seconds: 5, Milliseconds: 0}
	entry2.EndTime = model.Timestamp{Hours: 0, Minutes: 0, Seconds: 8, Milliseconds: 0}
	entry2.Text = "This is the second line."
	
	subtitle.Entries = append(subtitle.Entries, entry1, entry2)

	// Convert to LRC
	tempDir := t.TempDir()
	outputFile := filepath.Join(tempDir, "output.lrc")
	err := ConvertFromSubtitle(subtitle, outputFile)
	if err != nil {
		t.Fatalf("ConvertFromSubtitle failed: %v", err)
	}

	// Verify by reading the file directly
	content, err := os.ReadFile(outputFile)
	if err != nil {
		t.Fatalf("Failed to read output file: %v", err)
	}

	// Check content
	contentStr := string(content)
	
	// Check metadata
	if !strings.Contains(contentStr, "[ti:Test LRC File]") {
		t.Errorf("Expected title metadata in output, not found")
	}
	
	if !strings.Contains(contentStr, "[ar:Test Artist]") {
		t.Errorf("Expected artist metadata in output, not found")
	}
	
	// Check timeline entries
	if !strings.Contains(contentStr, "[00:01.000]This is the first line.") {
		t.Errorf("Expected first timeline entry in output, not found")
	}
	
	if !strings.Contains(contentStr, "[00:05.000]This is the second line.") {
		t.Errorf("Expected second timeline entry in output, not found")
	}
}

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

func TestConvertToSubtitle_EdgeCases(t *testing.T) {
	// Test with empty lyrics (no content/timeline)
	tempDir := t.TempDir()
	emptyLyricsFile := filepath.Join(tempDir, "empty_lyrics.lrc")
	content := `[ti:Test LRC File]
[ar:Test Artist]
`
	if err := os.WriteFile(emptyLyricsFile, []byte(content), 0644); err != nil {
		t.Fatalf("Failed to create empty lyrics test file: %v", err)
	}

	subtitle, err := ConvertToSubtitle(emptyLyricsFile)
	if err != nil {
		t.Fatalf("ConvertToSubtitle failed on empty lyrics: %v", err)
	}

	if len(subtitle.Entries) != 0 {
		t.Errorf("Expected 0 entries for empty lyrics, got %d", len(subtitle.Entries))
	}

	if subtitle.Title != "Test LRC File" {
		t.Errorf("Expected title 'Test LRC File', got '%s'", subtitle.Title)
	}

	// Test with more content than timeline entries
	moreContentFile := filepath.Join(tempDir, "more_content.lrc")
	content = `[ti:Test LRC File]

[00:01.00]This has a timestamp.
This doesn't have a timestamp but is content.
`
	if err := os.WriteFile(moreContentFile, []byte(content), 0644); err != nil {
		t.Fatalf("Failed to create more content test file: %v", err)
	}

	subtitle, err = ConvertToSubtitle(moreContentFile)
	if err != nil {
		t.Fatalf("ConvertToSubtitle failed on file with more content than timestamps: %v", err)
	}

	if len(subtitle.Entries) != 1 {
		t.Errorf("Expected 1 entry (only the one with timestamp), got %d", len(subtitle.Entries))
	}
}

func TestConvertFromSubtitle_FileError(t *testing.T) {
	// Create simple subtitle
	subtitle := model.NewSubtitle()
	subtitle.Entries = append(subtitle.Entries, model.NewSubtitleEntry())

	// Test with invalid path
	err := ConvertFromSubtitle(subtitle, "/nonexistent/directory/file.lrc")
	if err == nil {
		t.Error("Expected error when converting to invalid path, got nil")
	}
}