package vtt

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

func TestParse(t *testing.T) {
	// Create a temporary test file
	content := `WEBVTT

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.

3
00:00:09.500 --> 00:00:12.800
This is the third line
with a line break.
`
	tempDir := t.TempDir()
	testFile := filepath.Join(tempDir, "test.vtt")
	if err := os.WriteFile(testFile, []byte(content), 0644); err != nil {
		t.Fatalf("Failed to create test file: %v", err)
	}

	// Test parsing
	subtitle, err := Parse(testFile)
	if err != nil {
		t.Fatalf("Parse failed: %v", err)
	}

	// Verify results
	if subtitle.Format != "vtt" {
		t.Errorf("Expected format 'vtt', got '%s'", subtitle.Format)
	}

	if len(subtitle.Entries) != 3 {
		t.Errorf("Expected 3 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].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 00:00:01.000, got %+v", subtitle.Entries[0].StartTime)
	}
	if subtitle.Entries[0].EndTime.Hours != 0 || subtitle.Entries[0].EndTime.Minutes != 0 || 
	   subtitle.Entries[0].EndTime.Seconds != 4 || subtitle.Entries[0].EndTime.Milliseconds != 0 {
		t.Errorf("First entry end time: expected 00:00:04.000, got %+v", subtitle.Entries[0].EndTime)
	}
	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 third entry with line break
	if subtitle.Entries[2].Index != 3 {
		t.Errorf("Third entry index: expected 3, got %d", subtitle.Entries[2].Index)
	}
	expectedText := "This is the third line\nwith a line break."
	if subtitle.Entries[2].Text != expectedText {
		t.Errorf("Third entry text: expected '%s', got '%s'", expectedText, subtitle.Entries[2].Text)
	}
}

func TestParse_WithHeader(t *testing.T) {
	// Create a temporary test file with title
	content := `WEBVTT - Test Title

1
00:00:01.000 --> 00:00:04.000
This is the first line.
`
	tempDir := t.TempDir()
	testFile := filepath.Join(tempDir, "test.vtt")
	if err := os.WriteFile(testFile, []byte(content), 0644); err != nil {
		t.Fatalf("Failed to create test file: %v", err)
	}

	// Test parsing
	subtitle, err := Parse(testFile)
	if err != nil {
		t.Fatalf("Parse failed: %v", err)
	}

	// Verify title was extracted
	if subtitle.Title != "Test Title" {
		t.Errorf("Expected title 'Test Title', got '%s'", subtitle.Title)
	}
}

func TestParse_WithStyles(t *testing.T) {
	// Create a temporary test file with CSS styling
	content := `WEBVTT

STYLE
::cue {
  color: white;
  background-color: black;
}

1
00:00:01.000 --> 00:00:04.000 align:start position:10%
This is <b>styled</b> text.
`
	tempDir := t.TempDir()
	testFile := filepath.Join(tempDir, "test.vtt")
	if err := os.WriteFile(testFile, []byte(content), 0644); err != nil {
		t.Fatalf("Failed to create test file: %v", err)
	}

	// Test parsing
	subtitle, err := Parse(testFile)
	if err != nil {
		t.Fatalf("Parse failed: %v", err)
	}

	// First check if we have entries at all
	if len(subtitle.Entries) == 0 {
		t.Fatalf("No entries found in parsed subtitle")
	}

	// Verify styling was captured
	if subtitle.Entries[0].Styles == nil {
		t.Fatalf("Entry styles map is nil")
	}

	// Verify HTML tags were detected
	if _, ok := subtitle.Entries[0].FormatData["has_html_tags"]; !ok {
		t.Errorf("Expected HTML tags to be detected in entry")
	}

	// Verify cue settings were captured
	if subtitle.Entries[0].Styles["align"] != "start" {
		t.Errorf("Expected align style 'start', got '%s'", subtitle.Entries[0].Styles["align"])
	}
	if subtitle.Entries[0].Styles["position"] != "10%" {
		t.Errorf("Expected position style '10%%', got '%s'", subtitle.Entries[0].Styles["position"])
	}
}

func TestParse_WithComments(t *testing.T) {
	// Create a temporary test file with comments
	content := `WEBVTT

NOTE This is a comment
NOTE This is another comment

1
00:00:01.000 --> 00:00:04.000
This is the first line.
`
	tempDir := t.TempDir()
	testFile := filepath.Join(tempDir, "test_comments.vtt")
	if err := os.WriteFile(testFile, []byte(content), 0644); err != nil {
		t.Fatalf("Failed to create test file: %v", err)
	}

	// Test parsing
	subtitle, err := Parse(testFile)
	if err != nil {
		t.Fatalf("Parse failed: %v", err)
	}

	// Verify comments were captured
	if len(subtitle.Comments) != 2 {
		t.Errorf("Expected 2 comments, got %d", len(subtitle.Comments))
	}
	
	if subtitle.Comments[0] != "This is a comment" {
		t.Errorf("Expected first comment 'This is a comment', got '%s'", subtitle.Comments[0])
	}
	
	if subtitle.Comments[1] != "This is another comment" {
		t.Errorf("Expected second comment 'This is another comment', got '%s'", subtitle.Comments[1])
	}
}

func TestParse_FileErrors(t *testing.T) {
	// Test with empty file
	tempDir := t.TempDir()
	emptyFile := filepath.Join(tempDir, "empty.vtt")
	if err := os.WriteFile(emptyFile, []byte(""), 0644); err != nil {
		t.Fatalf("Failed to create empty file: %v", err)
	}
	
	_, err := Parse(emptyFile)
	if err == nil {
		t.Error("Expected error when parsing empty file, got nil")
	}
	
	// Test with invalid WEBVTT header
	invalidFile := filepath.Join(tempDir, "invalid.vtt")
	if err := os.WriteFile(invalidFile, []byte("INVALID HEADER\n\n"), 0644); err != nil {
		t.Fatalf("Failed to create invalid file: %v", err)
	}
	
	_, err = Parse(invalidFile)
	if err == nil {
		t.Error("Expected error when parsing file with invalid header, got nil")
	}
	
	// Test with non-existent file
	_, err = Parse("/nonexistent/file.vtt")
	if err == nil {
		t.Error("Expected error when parsing non-existent file, got nil")
	}
}