package middleware

import (
	"net/http"
	"net/http/httptest"
	"testing"
)

// TestPreferencesMiddleware tests that middleware reads cookies and stores in context
func TestPreferencesMiddleware(t *testing.T) {
	tests := []struct {
		name           string
		cookies        map[string]string
		expectedPrefs  *Preferences
		description    string
	}{
		{
			name: "Default preferences (no cookies)",
			cookies: map[string]string{},
			expectedPrefs: &Preferences{
				CVLength:   "short",
				CVIcons:    "show",
				CVLanguage: "en",
				CVTheme:    "default",
				ColorTheme: "light",
			},
			description: "Should use default values when no cookies present",
		},
		{
			name: "All preferences set",
			cookies: map[string]string{
				"cv-length":   "long",
				"cv-icons":    "hide",
				"cv-language": "es",
				"cv-theme":    "clean",
				"color-theme": "dark",
			},
			expectedPrefs: &Preferences{
				CVLength:   "long",
				CVIcons:    "hide",
				CVLanguage: "es",
				CVTheme:    "clean",
				ColorTheme: "dark",
			},
			description: "Should read all preference cookies correctly",
		},
		{
			name: "Migration: extended → long",
			cookies: map[string]string{
				"cv-length": "extended",
			},
			expectedPrefs: &Preferences{
				CVLength:   "long", // Migrated from "extended"
				CVIcons:    "show",
				CVLanguage: "en",
				CVTheme:    "default",
				ColorTheme: "light",
			},
			description: "Should migrate 'extended' to 'long'",
		},
		{
			name: "Migration: true → show",
			cookies: map[string]string{
				"cv-icons": "true",
			},
			expectedPrefs: &Preferences{
				CVLength:   "short",
				CVIcons:    "show", // Migrated from "true"
				CVLanguage: "en",
				CVTheme:    "default",
				ColorTheme: "light",
			},
			description: "Should migrate 'true' to 'show'",
		},
		{
			name: "Migration: false → hide",
			cookies: map[string]string{
				"cv-icons": "false",
			},
			expectedPrefs: &Preferences{
				CVLength:   "short",
				CVIcons:    "hide", // Migrated from "false"
				CVLanguage: "en",
				CVTheme:    "default",
				ColorTheme: "light",
			},
			description: "Should migrate 'false' to 'hide'",
		},
		{
			name: "Partial preferences",
			cookies: map[string]string{
				"cv-length":   "long",
				"cv-language": "es",
			},
			expectedPrefs: &Preferences{
				CVLength:   "long",
				CVIcons:    "show",     // Default
				CVLanguage: "es",
				CVTheme:    "default",  // Default
				ColorTheme: "light",    // Default
			},
			description: "Should combine cookies with defaults",
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			// Create request with cookies
			req := httptest.NewRequest(http.MethodGet, "/", nil)
			for name, value := range tt.cookies {
				req.AddCookie(&http.Cookie{
					Name:  name,
					Value: value,
				})
			}

			// Create test handler that checks context
			var capturedPrefs *Preferences
			testHandler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
				capturedPrefs = GetPreferences(r)
				w.WriteHeader(http.StatusOK)
			})

			// Wrap with middleware
			wrappedHandler := PreferencesMiddleware(testHandler)

			// Execute request
			w := httptest.NewRecorder()
			wrappedHandler.ServeHTTP(w, req)

			// Verify preferences
			if capturedPrefs == nil {
				t.Fatal("Preferences not found in context")
			}

			if capturedPrefs.CVLength != tt.expectedPrefs.CVLength {
				t.Errorf("CVLength: got %q, want %q", capturedPrefs.CVLength, tt.expectedPrefs.CVLength)
			}
			if capturedPrefs.CVIcons != tt.expectedPrefs.CVIcons {
				t.Errorf("CVIcons: got %q, want %q", capturedPrefs.CVIcons, tt.expectedPrefs.CVIcons)
			}
			if capturedPrefs.CVLanguage != tt.expectedPrefs.CVLanguage {
				t.Errorf("CVLanguage: got %q, want %q", capturedPrefs.CVLanguage, tt.expectedPrefs.CVLanguage)
			}
			if capturedPrefs.CVTheme != tt.expectedPrefs.CVTheme {
				t.Errorf("CVTheme: got %q, want %q", capturedPrefs.CVTheme, tt.expectedPrefs.CVTheme)
			}
			if capturedPrefs.ColorTheme != tt.expectedPrefs.ColorTheme {
				t.Errorf("ColorTheme: got %q, want %q", capturedPrefs.ColorTheme, tt.expectedPrefs.ColorTheme)
			}
		})
	}
}

// TestGetPreferencesWithoutMiddleware tests fallback behavior
func TestGetPreferencesWithoutMiddleware(t *testing.T) {
	// Create request without middleware
	req := httptest.NewRequest(http.MethodGet, "/", nil)

	// GetPreferences should return defaults
	prefs := GetPreferences(req)

	if prefs.CVLength != "short" {
		t.Errorf("Expected default CVLength 'short', got %q", prefs.CVLength)
	}
	if prefs.CVIcons != "show" {
		t.Errorf("Expected default CVIcons 'show', got %q", prefs.CVIcons)
	}
	if prefs.CVLanguage != "en" {
		t.Errorf("Expected default CVLanguage 'en', got %q", prefs.CVLanguage)
	}
	if prefs.CVTheme != "default" {
		t.Errorf("Expected default CVTheme 'default', got %q", prefs.CVTheme)
	}
	if prefs.ColorTheme != "light" {
		t.Errorf("Expected default ColorTheme 'light', got %q", prefs.ColorTheme)
	}
}

// TestSetPreferenceCookie tests cookie setting
func TestSetPreferenceCookie(t *testing.T) {
	tests := []struct {
		name          string
		cookieName    string
		cookieValue   string
	}{
		{
			name:        "Set cv-length cookie",
			cookieName:  "cv-length",
			cookieValue: "long",
		},
		{
			name:        "Set cv-icons cookie",
			cookieName:  "cv-icons",
			cookieValue: "hide",
		},
		{
			name:        "Set cv-language cookie",
			cookieName:  "cv-language",
			cookieValue: "es",
		},
		{
			name:        "Set cv-theme cookie",
			cookieName:  "cv-theme",
			cookieValue: "clean",
		},
		{
			name:        "Set color-theme cookie",
			cookieName:  "color-theme",
			cookieValue: "dark",
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			w := httptest.NewRecorder()

			SetPreferenceCookie(w, tt.cookieName, tt.cookieValue)

			// Get cookies from response
			cookies := w.Result().Cookies()
			if len(cookies) != 1 {
				t.Fatalf("Expected 1 cookie, got %d", len(cookies))
			}

			cookie := cookies[0]

			// Verify cookie attributes
			if cookie.Name != tt.cookieName {
				t.Errorf("Cookie name: got %q, want %q", cookie.Name, tt.cookieName)
			}
			if cookie.Value != tt.cookieValue {
				t.Errorf("Cookie value: got %q, want %q", cookie.Value, tt.cookieValue)
			}
			if cookie.Path != "/" {
				t.Errorf("Cookie path: got %q, want %q", cookie.Path, "/")
			}
			if cookie.MaxAge != 365*24*60*60 {
				t.Errorf("Cookie MaxAge: got %d, want %d (1 year)", cookie.MaxAge, 365*24*60*60)
			}
			if !cookie.HttpOnly {
				t.Error("Cookie should be HttpOnly")
			}
			if cookie.SameSite != http.SameSiteStrictMode {
				t.Errorf("Cookie SameSite: got %v, want %v", cookie.SameSite, http.SameSiteStrictMode)
			}
		})
	}
}

// TestGetPreferenceCookie tests cookie reading helper
func TestGetPreferenceCookie(t *testing.T) {
	tests := []struct {
		name          string
		cookieName    string
		cookieValue   string
		defaultValue  string
		expectedValue string
	}{
		{
			name:          "Cookie exists",
			cookieName:    "cv-length",
			cookieValue:   "long",
			defaultValue:  "short",
			expectedValue: "long",
		},
		{
			name:          "Cookie doesn't exist",
			cookieName:    "cv-length",
			cookieValue:   "",
			defaultValue:  "short",
			expectedValue: "short",
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			req := httptest.NewRequest(http.MethodGet, "/", nil)

			if tt.cookieValue != "" {
				req.AddCookie(&http.Cookie{
					Name:  tt.cookieName,
					Value: tt.cookieValue,
				})
			}

			value := getPreferenceCookie(req, tt.cookieName, tt.defaultValue)

			if value != tt.expectedValue {
				t.Errorf("Expected %q, got %q", tt.expectedValue, value)
			}
		})
	}
}

// TestMiddlewareChain tests middleware can be chained
func TestMiddlewareChain(t *testing.T) {
	// Create multiple handlers in chain
	finalHandler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		prefs := GetPreferences(r)
		w.Header().Set("X-CV-Length", prefs.CVLength)
		w.WriteHeader(http.StatusOK)
	})

	// Wrap with middleware
	wrappedHandler := PreferencesMiddleware(finalHandler)

	// Create request with cookie
	req := httptest.NewRequest(http.MethodGet, "/", nil)
	req.AddCookie(&http.Cookie{Name: "cv-length", Value: "long"})

	w := httptest.NewRecorder()
	wrappedHandler.ServeHTTP(w, req)

	// Verify preferences were passed through chain
	if w.Header().Get("X-CV-Length") != "long" {
		t.Errorf("Expected X-CV-Length header 'long', got %q", w.Header().Get("X-CV-Length"))
	}
}

// TestMultipleMigrations tests multiple migrations in one request
func TestMultipleMigrations(t *testing.T) {
	req := httptest.NewRequest(http.MethodGet, "/", nil)
	req.AddCookie(&http.Cookie{Name: "cv-length", Value: "extended"})
	req.AddCookie(&http.Cookie{Name: "cv-icons", Value: "true"})

	var capturedPrefs *Preferences
	testHandler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		capturedPrefs = GetPreferences(r)
	})

	wrappedHandler := PreferencesMiddleware(testHandler)

	w := httptest.NewRecorder()
	wrappedHandler.ServeHTTP(w, req)

	// Both migrations should occur
	if capturedPrefs.CVLength != "long" {
		t.Errorf("CVLength: expected 'long' (migrated from 'extended'), got %q", capturedPrefs.CVLength)
	}
	if capturedPrefs.CVIcons != "show" {
		t.Errorf("CVIcons: expected 'show' (migrated from 'true'), got %q", capturedPrefs.CVIcons)
	}
}

// TestIsProductionMode tests the production mode detection function
func TestIsProductionMode(t *testing.T) {
	tests := []struct {
		name     string
		envValue string
		expected bool
	}{
		{
			name:     "Production environment",
			envValue: "production",
			expected: true,
		},
		{
			name:     "Prod shorthand",
			envValue: "prod",
			expected: true,
		},
		{
			name:     "Development environment",
			envValue: "development",
			expected: false,
		},
		{
			name:     "Empty environment",
			envValue: "",
			expected: false,
		},
		{
			name:     "Staging environment",
			envValue: "staging",
			expected: false,
		},
		{
			name:     "Case sensitivity - PRODUCTION",
			envValue: "PRODUCTION",
			expected: false, // Case sensitive
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			// t.Setenv automatically restores the original value after the test
			t.Setenv("GO_ENV", tt.envValue)

			result := isProductionMode()

			if result != tt.expected {
				t.Errorf("isProductionMode() with GO_ENV=%q: got %v, want %v",
					tt.envValue, result, tt.expected)
			}
		})
	}
}

// TestSetPreferenceCookieSecureFlag tests that Secure flag is set correctly based on environment
func TestSetPreferenceCookieSecureFlag(t *testing.T) {
	tests := []struct {
		name           string
		envValue       string
		expectedSecure bool
	}{
		{
			name:           "Production mode sets Secure=true",
			envValue:       "production",
			expectedSecure: true,
		},
		{
			name:           "Development mode sets Secure=false",
			envValue:       "development",
			expectedSecure: false,
		},
		{
			name:           "Empty env sets Secure=false",
			envValue:       "",
			expectedSecure: false,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			// t.Setenv automatically restores the original value after the test
			t.Setenv("GO_ENV", tt.envValue)

			w := httptest.NewRecorder()
			SetPreferenceCookie(w, "test-cookie", "test-value")

			cookies := w.Result().Cookies()
			if len(cookies) != 1 {
				t.Fatalf("Expected 1 cookie, got %d", len(cookies))
			}

			if cookies[0].Secure != tt.expectedSecure {
				t.Errorf("Cookie Secure flag with GO_ENV=%q: got %v, want %v",
					tt.envValue, cookies[0].Secure, tt.expectedSecure)
			}
		})
	}
}