package media

import (
	"strings"
	"testing"

	"github.com/tinode/chat/server/store/types"
)

func TestMatchCORSOrigin(t *testing.T) {
	cases := []struct {
		allowed      []string
		origin       string
		expected     string
		expectError  bool
		errorMessage string
	}{
		{
			allowed:  []string{"https://example.com"},
			origin:   "https://example.com",
			expected: "https://example.com",
		},
		{
			allowed:  []string{"https://example2.com", "https://example.com"},
			origin:   "https://example.com",
			expected: "https://example.com",
		},
		{
			allowed:  []string{"*"},
			origin:   "https://example.com",
			expected: "https://example.com",
		},
		{
			allowed:  []string{""},
			origin:   "https://example.com",
			expected: "",
		},
		{
			allowed:  []string{},
			origin:   "",
			expected: "",
		},
		{
			allowed:  []string{"https://example.com"},
			origin:   "",
			expected: "",
		},
		{
			allowed:  []string{},
			origin:   "https://example.com",
			expected: "",
		},
		{
			allowed:  []string{"http://example.com"},
			origin:   "https://example.com",
			expected: "",
		},
		{
			allowed:  []string{"https://example.com"},
			origin:   "http://example.com",
			expected: "",
		},
		{
			allowed:  []string{"http://example.com:8000"},
			origin:   "http://example.com:8000",
			expected: "http://example.com:8000",
		},
		{
			allowed:  []string{"http://localhost:8090"},
			origin:   "http://localhost:8090",
			expected: "http://localhost:8090",
		},
		{
			allowed:  []string{"http://localhost:8090"},
			origin:   "http://localhost:8080",
			expected: "",
		},
		{
			allowed:  []string{"https://example.com"},
			origin:   "https://sub.example.com",
			expected: "",
		},
		{
			allowed:  []string{"https://*.example.com"},
			origin:   "https://sub.example.com",
			expected: "https://sub.example.com",
		},
		{
			allowed:  []string{"https://*.example.com"},
			origin:   "https://pre.sub.example.com",
			expected: "",
		},
		{
			allowed:  []string{"https://*.example.com", "https://*.sub.example.com"},
			origin:   "https://pre.sub.example.com",
			expected: "https://pre.sub.example.com",
		},
		{
			allowed:  []string{"https://*.*.example.com"},
			origin:   "https://pre.sub.example.com",
			expected: "https://pre.sub.example.com",
		},
		{
			allowed:  []string{"https://*.sub.example.com"},
			origin:   "https://pre.asd.example.com",
			expected: "",
		},
		{
			allowed:  []string{"https://pre.*.example.com"},
			origin:   "https://pre.sub.example.com",
			expected: "https://pre.sub.example.com",
		},
		{
			allowed:  []string{"https://*.*.*.example.com"},
			origin:   "https://www.pre.sub.example.com",
			expected: "https://www.pre.sub.example.com",
		},
		{
			allowed:  []string{"*"},
			origin:   "",
			expected: "*", // Should allow any origin, including empty
		},
		// Error cases - these should fail during ParseCORSAllow
		{
			allowed:      []string{"*", "https://example.com"},
			origin:       "https://example.com",
			expectError:  true,
			errorMessage: "wildcard origin '*' must be the only entry",
		},
		{
			allowed:      []string{"not-a-valid-url"},
			origin:       "https://example.com",
			expectError:  true,
			errorMessage: "invalid URI for request",
		},
		{
			allowed:      []string{"://invalid-url"},
			origin:       "https://example.com",
			expectError:  true,
			errorMessage: "missing protocol scheme",
		},
		{
			allowed:      []string{"https://", "example.com"},
			origin:       "https://example.com",
			expectError:  true,
			errorMessage: "invalid URI for request",
		},
		// Valid cases that should not error
		{
			allowed:      []string{"", "https://example.com"},
			origin:       "https://example.com",
			expectError:  true,
			errorMessage: "empty allowed origin '' must be the only entry", // Empty string should make all origins disallowed
		},
		{
			allowed:  []string{"https://Example.com"},
			origin:   "https://example.com",
			expected: "", // Should not match due to case sensitivity
		},
		{
			allowed:  []string{"https://example.com/"},
			origin:   "https://example.com",
			expected: "", // Should not match due to trailing slash
		},
		{
			allowed:  []string{"https://example.com"},
			origin:   "not-a-valid-url",
			expected: "", // Should handle malformed origin gracefully
		},
		{
			allowed:  []string{"https://example.*.com"},
			origin:   "https://example.sub.com",
			expected: "https://example.sub.com",
		},
		{
			allowed:  []string{"https://*.com"},
			origin:   "https://example.com",
			expected: "https://example.com",
		},
		{
			allowed:  []string{"http://*.example.com"},
			origin:   "https://sub.example.com",
			expected: "", // Should not match due to protocol difference
		},
		{
			allowed:  []string{"https://example.com", "https://example.com"},
			origin:   "https://example.com",
			expected: "https://example.com", // Should still work with duplicates
		},
	}

	for i, tc := range cases {
		allowedOrigins, err := ParseCORSAllow(tc.allowed)

		if tc.expectError {
			if err == nil {
				t.Errorf("Test case %d: Expected error but got none. Allowed: %v", i, tc.allowed)
				continue
			}
			if tc.errorMessage != "" && !containsSubstring(err.Error(), tc.errorMessage) {
				t.Errorf("Test case %d: Expected error containing '%s', got '%s'", i, tc.errorMessage, err.Error())
			}
			// For error cases, we don't test the matching logic
			continue
		}

		if err != nil {
			t.Errorf("Test case %d: Unexpected error parsing allowed origins: %v. Allowed: %v", i, err, tc.allowed)
			continue
		}

		result := matchCORSOrigin(allowedOrigins, tc.origin)
		if result != tc.expected {
			t.Errorf("Test case %d: Match CORS origin got wrong result. Expected '%s', got '%s'. Allowed: %v, Origin: '%s'",
				i, tc.expected, result, tc.allowed, tc.origin)
		}
	}
}

// Helper function to check if a string contains a substring (case-insensitive)
func containsSubstring(str, substr string) bool {
	return strings.Contains(strings.ToLower(str), strings.ToLower(substr))
}

func TestExtensionByMimeType(t *testing.T) {
	cases := map[string]string{
		"audio/x-m4a":              ".m4a",
		"audio/x-m4a; charset=utf": ".m4a",
		"audio/mp4":                ".m4a",
		"audio/aac":                ".aac",
		"audio/mpeg":               ".mp3",
		"image/jpeg":               ".jpg",
		"image/jfif":               ".jfif",
		"video/mp4":                ".mp4",
	}
	for mimeType, want := range cases {
		if got := ExtensionByMimeType(mimeType); got != want {
			t.Fatalf("ExtensionByMimeType(%q)=%q, want %q", mimeType, got, want)
		}
	}
}

func TestMimeTypeForUploadPrefersContainerFilename(t *testing.T) {
	cases := []struct {
		name     string
		detect   string
		client   string
		filename string
		want     string
	}{
		{
			name:     "m4a misdetected as mp4",
			detect:   "video/mp4",
			filename: "voice.m4a",
			want:     "audio/x-m4a",
		},
		{
			name:     "xlsx misdetected as zip",
			detect:   "application/zip",
			filename: "iOS任务拆解.xlsx",
			want:     "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
		},
		{
			name:     "client content type fallback",
			detect:   "application/octet-stream",
			client:   "image/jfif",
			filename: "thumb",
			want:     "image/jfif",
		},
	}
	for _, tc := range cases {
		t.Run(tc.name, func(t *testing.T) {
			if got := MimeTypeForUpload(tc.detect, tc.client, tc.filename); got != tc.want {
				t.Fatalf("MimeTypeForUpload()=%q, want %q", got, tc.want)
			}
		})
	}
}

func TestFileURLNamePrefersOriginalExtension(t *testing.T) {
	cases := []struct {
		name string
		def  *types.FileDef
		want string
	}{
		{
			name: "voice keeps m4a extension",
			def:  &types.FileDef{ObjHeader: types.ObjHeader{Id: "file123"}, MimeType: "video/mp4", OriginalName: "voice.m4a"},
			want: "file123.m4a",
		},
		{
			name: "xlsx keeps xlsx extension",
			def:  &types.FileDef{ObjHeader: types.ObjHeader{Id: "sheet123"}, MimeType: "application/zip", OriginalName: "iOS任务拆解.xlsx"},
			want: "sheet123.xlsx",
		},
		{
			name: "falls back to mime extension",
			def:  &types.FileDef{ObjHeader: types.ObjHeader{Id: "image123"}, MimeType: "image/jpeg"},
			want: "image123.jpg",
		},
	}
	for _, tc := range cases {
		t.Run(tc.name, func(t *testing.T) {
			if got := FileURLName(tc.def); got != tc.want {
				t.Fatalf("FileURLName()=%q, want %q", got, tc.want)
			}
		})
	}
}