package media

import (
	"path/filepath"
	"testing"
)

func TestFormatDuration(t *testing.T) {
	tests := []struct {
		name     string
		seconds  int
		expected string
	}{
		{"zero", 0, "00:00:00"},
		{"one second", 1, "00:00:01"},
		{"one minute", 60, "00:01:00"},
		{"one hour", 3600, "01:00:00"},
		{"mixed", 3661, "01:01:01"},
		{"large", 86399, "23:59:59"},
		{"negative", -5, "00:00:00"},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if got := FormatDuration(tt.seconds); got != tt.expected {
				t.Errorf("FormatDuration(%d) = %q, want %q", tt.seconds, got, tt.expected)
			}
		})
	}
}

func TestIsAllowedExtension(t *testing.T) {
	tests := []struct {
		name     string
		expected bool
	}{
		{"video.mp4", true},
		{"video.mov", true},
		{"video.mkv", true},
		{"video.webm", true},
		{"video.m4v", true},
		{"video.ts", true},
		{"video.MP4", true},
		{"video.avi", false},
		{"video.flv", false},
		{"video.wmv", false},
		{"video", false},
		{"", false},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if got := IsAllowedExtension(tt.name); got != tt.expected {
				t.Errorf("IsAllowedExtension(%q) = %v, want %v", tt.name, got, tt.expected)
			}
		})
	}
}

func TestIsAllowedMime(t *testing.T) {
	tests := []struct {
		mime     string
		expected bool
	}{
		{"video/mp4", true},
		{"video/quicktime", true},
		{"video/x-matroska", true},
		{"video/webm", true},
		{"application/octet-stream", true},
		{"", true},
		{"image/jpeg", false},
		{"audio/mpeg", false},
		{"text/plain", false},
	}

	for _, tt := range tests {
		t.Run(tt.mime, func(t *testing.T) {
			if got := IsAllowedMime(tt.mime); got != tt.expected {
				t.Errorf("IsAllowedMime(%q) = %v, want %v", tt.mime, got, tt.expected)
			}
		})
	}
}

func TestValidateUploadID(t *testing.T) {
	tests := []struct {
		id       string
		expected bool
	}{
		{"abcdef0123456789", true},           // 16 hex chars
		{"abcdef0123456789abcdef0123456789", true}, // 32 hex chars
		{"abc", false},                        // too short
		{"abcdef012345678", false},            // 15 chars (too short)
		{"abcdef0123456789g", false},          // non-hex char
		{"ABCDEF0123456789", false},           // uppercase (not allowed)
		{"", false},
	}

	for _, tt := range tests {
		t.Run(tt.id, func(t *testing.T) {
			if got := ValidateUploadID(tt.id); got != tt.expected {
				t.Errorf("ValidateUploadID(%q) = %v, want %v", tt.id, got, tt.expected)
			}
		})
	}
}

func TestParsePlaylist(t *testing.T) {
	tests := []struct {
		name     string
		content  string
		expected int
		first    string
	}{
		{
			name:     "simple",
			content:  "/videos/video1.mp4\n/videos/video2.mp4\n",
			expected: 2,
			first:    "/videos/video1.mp4",
		},
		{
			name:     "with file prefix",
			content:  "file /videos/video1.mp4\nfile '/videos/video2.mp4'\n",
			expected: 2,
			first:    "/videos/video1.mp4",
		},
		{
			name:     "with comments and blanks",
			content:  "# comment\n\n/videos/video1.mp4\n\n# another comment\n/videos/video2.mp4\n",
			expected: 2,
			first:    "/videos/video1.mp4",
		},
		{
			name:     "empty",
			content:  "",
			expected: 0,
		},
		{
			name:     "only comments",
			content:  "# comment\n# another\n",
			expected: 0,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			entries := ParsePlaylist(tt.content)
			if len(entries) != tt.expected {
				t.Errorf("ParsePlaylist() len = %d, want %d", len(entries), tt.expected)
			}
			if tt.expected > 0 && entries[0].Path != tt.first {
				t.Errorf("ParsePlaylist()[0].Path = %q, want %q", entries[0].Path, tt.first)
			}
			// Check indices
			for i, e := range entries {
				if e.Index != i+1 {
					t.Errorf("ParsePlaylist()[%d].Index = %d, want %d", i, e.Index, i+1)
				}
			}
		})
	}
}

func TestGetMediaIDFromPath(t *testing.T) {
	tests := []struct {
		path      string
		prefix    string
		expected  uint
		expectErr bool
	}{
		{"/api/admin/media/123", "/api/admin/media/", 123, false},
		{"/api/admin/media/1", "/api/admin/media/", 1, false},
		{"/api/admin/media/", "/api/admin/media/", 0, true},
		{"/api/admin/media/abc", "/api/admin/media/", 0, true},
		{"/api/admin/media/0", "/api/admin/media/", 0, true},
		{"/other/path", "/api/admin/media/", 0, true},
	}

	for _, tt := range tests {
		t.Run(tt.path, func(t *testing.T) {
			id, err := GetMediaIDFromPath(tt.path, tt.prefix)
			if tt.expectErr && err == nil {
				t.Errorf("GetMediaIDFromPath(%q) expected error, got nil", tt.path)
			}
			if !tt.expectErr && err != nil {
				t.Errorf("GetMediaIDFromPath(%q) error = %v", tt.path, err)
			}
			if id != tt.expected {
				t.Errorf("GetMediaIDFromPath(%q) = %d, want %d", tt.path, id, tt.expected)
			}
		})
	}
}

func TestUniqueTargetPath(t *testing.T) {
	// Test that the function returns a path with the mediaDir prefix
	// and the correct filename. We can't easily test collision behavior
	// without filesystem setup, but we can verify the basic path.
	expected := filepath.Join("/tmp/media", "video.mp4")
	path := UniqueTargetPath("/tmp/media", "video.mp4")
	if path != expected {
		t.Errorf("UniqueTargetPath() = %q, want %q", path, expected)
	}
}