package srt

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

	"sub-cli/internal/model"
)

func TestConvertToSubtitle(t *testing.T) {
	// Create a temporary test file
	content := `1
00:00:01,000 --> 00:00:04,000
This is the first line.

2
00:00:05,000 --> 00:00:08,000
This is the second line.
`
	tempDir := t.TempDir()
	testFile := filepath.Join(tempDir, "test.srt")
	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 != "srt" {
		t.Errorf("Expected format 'srt', 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].Index != 1 {
		t.Errorf("First entry index: expected 1, got %d", subtitle.Entries[0].Index)
	}
	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)
	}
}

func TestConvertFromSubtitle(t *testing.T) {
	// Create a subtitle
	subtitle := model.NewSubtitle()
	subtitle.Format = "srt"
	
	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 SRT
	tempDir := t.TempDir()
	outputFile := filepath.Join(tempDir, "output.srt")
	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
	lines := strings.Split(string(content), "\n")
	if len(lines) < 7 {
		t.Fatalf("Expected at least 7 lines, got %d", len(lines))
	}

	// Check that the SRT entries were created correctly
	if lines[0] != "1" {
		t.Errorf("Expected first entry number to be '1', got '%s'", lines[0])
	}
	if !strings.Contains(lines[1], "00:00:01,000 --> 00:00:04,000") {
		t.Errorf("Expected first entry time range to match, got '%s'", lines[1])
	}
	if lines[2] != "This is the first line." {
		t.Errorf("Expected first entry content to match, got '%s'", lines[2])
	}
}

func TestConvertToSubtitle_WithHTMLTags(t *testing.T) {
	// Create a temporary test file with HTML styling tags
	content := `1
00:00:01,000 --> 00:00:04,000
<i>This is italic.</i>

2
00:00:05,000 --> 00:00:08,000
<b>This is bold.</b>

3
00:00:09,000 --> 00:00:12,000
<u>This is underlined.</u>
`
	tempDir := t.TempDir()
	testFile := filepath.Join(tempDir, "styled.srt")
	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 style detection
	if value, ok := subtitle.Entries[0].Styles["italic"]; !ok || value != "true" {
		t.Errorf("Expected Styles to contain italic=true for entry with <i> tag")
	}

	if value, ok := subtitle.Entries[1].Styles["bold"]; !ok || value != "true" {
		t.Errorf("Expected Styles to contain bold=true for entry with <b> tag")
	}

	if value, ok := subtitle.Entries[2].Styles["underline"]; !ok || value != "true" {
		t.Errorf("Expected Styles to contain underline=true for entry with <u> tag")
	}
}

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

func TestConvertFromSubtitle_WithStyling(t *testing.T) {
	// Create a subtitle with style attributes
	subtitle := model.NewSubtitle()
	subtitle.Format = "srt"
	
	// Create an entry with italics
	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 should be italic."
	entry1.Styles["italic"] = "true"
	
	// Create an entry with bold
	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 should be bold."
	entry2.Styles["bold"] = "true"
	
	// Create an entry with underline
	entry3 := model.NewSubtitleEntry()
	entry3.Index = 3
	entry3.StartTime = model.Timestamp{Hours: 0, Minutes: 0, Seconds: 9, Milliseconds: 0}
	entry3.EndTime = model.Timestamp{Hours: 0, Minutes: 0, Seconds: 12, Milliseconds: 0}
	entry3.Text = "This should be underlined."
	entry3.Styles["underline"] = "true"
	
	subtitle.Entries = append(subtitle.Entries, entry1, entry2, entry3)

	// Convert from subtitle to SRT
	tempDir := t.TempDir()
	outputFile := filepath.Join(tempDir, "styled.srt")
	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 that HTML tags were applied
	contentStr := string(content)
	if !strings.Contains(contentStr, "<i>This should be italic.</i>") {
		t.Errorf("Expected italic HTML tags to be applied")
	}
	if !strings.Contains(contentStr, "<b>This should be bold.</b>") {
		t.Errorf("Expected bold HTML tags to be applied")
	}
	if !strings.Contains(contentStr, "<u>This should be underlined.</u>") {
		t.Errorf("Expected underline HTML tags to be applied")
	}
}

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.srt")
	if err == nil {
		t.Error("Expected error when converting to invalid path, got nil")
	}
}

func TestConvertFromSubtitle_WithExistingHTMLTags(t *testing.T) {
	// Create a subtitle with text that already contains HTML tags
	subtitle := model.NewSubtitle()
	subtitle.Format = "srt"
	
	// Create an entry with existing italic tags but also style attribute
	entry := model.NewSubtitleEntry()
	entry.Index = 1
	entry.StartTime = model.Timestamp{Hours: 0, Minutes: 0, Seconds: 1, Milliseconds: 0}
	entry.EndTime = model.Timestamp{Hours: 0, Minutes: 0, Seconds: 4, Milliseconds: 0}
	entry.Text = "<i>Already italic text.</i>"
	entry.Styles["italic"] = "true" // Should not double-wrap with <i> tags
	
	subtitle.Entries = append(subtitle.Entries, entry)

	// Convert from subtitle to SRT
	tempDir := t.TempDir()
	outputFile := filepath.Join(tempDir, "existing_tags.srt")
	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)
	}

	// Should not have double tags
	contentStr := string(content)
	if strings.Contains(contentStr, "<i><i>") {
		t.Errorf("Expected no duplicate italic tags, but found them")
	}
}