package cognitoauth

import (
	"encoding/json"
	"log/slog"
	"net/http"
	"net/http/httptest"
	"os"
	"testing"
	"time"

	"github.com/labstack/echo/v4"
)

// TestJWTAuthMiddleware tests the JWTAuthMiddleware function to ensure it correctly processes
// authentication tokens from both headers and cookies. It verifies that:
// - Public paths (/login, /callback, /home) are skipped without authentication
// - The /logout path properly clears authentication cookies
// - Requests with Authorization headers are passed through
// - Requests with auth_token cookies have their tokens moved to Authorization headers
// - Requests without authentication are redirected to the login page
func TestJWTAuthMiddleware(t *testing.T) {
	// Setup
	e := echo.New()
	config := &mockConfigProvider{
		region:     "us-east-2",
		userPoolID: "us-east-2_testpool",
	}

	// Setup logger
	logHandler := slog.NewTextHandler(os.Stdout, &slog.HandlerOptions{
		Level: slog.LevelDebug,
	})
	logger := slog.New(logHandler)
	config.SetAuthLogger(logger)

	// Create middleware
	middleware := JWTAuthMiddleware(config)

	// Test handler that simply returns success
	testHandler := func(c echo.Context) error {
		return c.String(http.StatusOK, "success")
	}

	// Test cases
	tests := []struct {
		name           string
		path           string
		setupRequest   func(*http.Request)
		expectStatus   int
		expectLocation string
		expectHeader   string
	}{
		{
			name: "skip login path",
			path: "/login",
			setupRequest: func(req *http.Request) {
				// No setup needed
			},
			expectStatus: http.StatusOK,
		},
		{
			name: "skip callback path",
			path: "/callback",
			setupRequest: func(req *http.Request) {
				// No setup needed
			},
			expectStatus: http.StatusOK,
		},
		{
			name: "skip home path",
			path: "/home",
			setupRequest: func(req *http.Request) {
				// No setup needed
			},
			expectStatus: http.StatusOK,
		},
		{
			name: "logout path sets empty cookie",
			path: "/logout",
			setupRequest: func(req *http.Request) {
				// No setup needed
			},
			expectStatus: http.StatusOK,
		},
		{
			name: "use authorization header",
			path: "/api/test",
			setupRequest: func(req *http.Request) {
				req.Header.Set("Authorization", "Bearer test-token")
			},
			expectStatus: http.StatusOK,
		},
		{
			name: "use cookie if no authorization header",
			path: "/api/test",
			setupRequest: func(req *http.Request) {
				cookie := &http.Cookie{
					Name:  "auth_token",
					Value: "cookie-token",
					Path:  "/",
				}
				req.AddCookie(cookie)
			},
			expectStatus: http.StatusOK,
			expectHeader: "Bearer cookie-token",
		},
		{
			name: "continue to next middleware if no token",
			path: "/api/test",
			setupRequest: func(req *http.Request) {
				// No auth header or cookie
			},
			expectStatus: http.StatusOK, // Should continue to test handler
		},
	}

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

			// Setup request (add headers, cookies, etc.)
			tt.setupRequest(req)

			// Create Echo context
			c := e.NewContext(req, rec)
			c.SetPath(tt.path)

			// Run middleware
			err := middleware(testHandler)(c)
			if err != nil {
				t.Errorf("Middleware returned error: %v", err)
			}

			// Check status code
			if rec.Code != tt.expectStatus {
				t.Errorf("Expected status code %d, got %d", tt.expectStatus, rec.Code)
			}

			// Check location header (for redirects)
			if tt.expectLocation != "" {
				location := rec.Header().Get("Location")
				if location != tt.expectLocation {
					t.Errorf("Expected Location header %q, got %q", tt.expectLocation, location)
				}
			}

			// Check Authorization header (if token taken from cookie)
			if tt.expectHeader != "" {
				authHeader := req.Header.Get("Authorization")
				if authHeader != tt.expectHeader {
					t.Errorf("Expected Authorization header %q, got %q", tt.expectHeader, authHeader)
				}
			}

			// Special case for logout - check cookie
			if tt.path == "/logout" {
				cookies := rec.Result().Cookies()
				found := false
				for _, cookie := range cookies {
					if cookie.Name == "auth_token" {
						found = true
						if cookie.Value != "" {
							t.Errorf("Expected empty auth_token cookie, got %q", cookie.Value)
						}
						if !cookie.Expires.Before(time.Now()) {
							t.Errorf("Expected auth_token cookie to be expired, got %v", cookie.Expires)
						}
					}
				}
				if !found {
					t.Error("Expected auth_token cookie to be set for logout")
				}
			}
		})
	}
}

// TestTokenValidationMiddleware tests the TokenValidationMiddleware function to verify that it:
// - Allows access to public paths (/home, /logout) without validation
// - Properly handles OAuth callbacks by processing code and state parameters
// - Initiates login by redirecting to Cognito when accessing the login path
// - Returns 401 Unauthorized for protected paths without Authorization header
// - Attempts to validate tokens for protected paths with Authorization headers
func TestTokenValidationMiddleware(t *testing.T) {
	// Setup
	e := echo.New()
	config := &mockConfigProvider{
		region:     "us-east-2",
		userPoolID: "us-east-2_testpool",
	}

	// Setup logger
	logHandler := slog.NewTextHandler(os.Stdout, &slog.HandlerOptions{
		Level: slog.LevelDebug,
	})
	logger := slog.New(logHandler)
	config.SetAuthLogger(logger)

	// Create middleware
	middleware := TokenValidationMiddleware(config)

	// Test handler that simply returns success
	testHandler := func(c echo.Context) error {
		return c.String(http.StatusOK, "success")
	}

	// Test cases
	tests := []struct {
		name         string
		path         string
		setupRequest func(*http.Request)
		expectStatus int
		checkBody    func(*testing.T, []byte)
	}{
		{
			name: "skip public paths - home",
			path: "/home",
			setupRequest: func(req *http.Request) {
				// No setup needed
			},
			expectStatus: http.StatusOK,
		},
		{
			name: "skip public paths - logout",
			path: "/logout",
			setupRequest: func(req *http.Request) {
				// No setup needed
			},
			expectStatus: http.StatusOK,
		},
		{
			name: "handle oauth callback",
			path: "/callback",
			setupRequest: func(req *http.Request) {
				q := req.URL.Query()
				q.Add("code", "test-code")
				q.Add("state", "test-state")
				req.URL.RawQuery = q.Encode()
			},
			// This will attempt to call handleOAuthCallback which will fail
			// but we're just testing the routing logic
			expectStatus: http.StatusBadRequest,
		},
		{
			name: "handle login initiation",
			path: "/login",
			setupRequest: func(req *http.Request) {
				// No setup needed
			},
			// The login initiation actually redirects to the Cognito login page
			expectStatus: http.StatusFound, // 302 Found (redirect)
			// We can't check the exact URL since it depends on generateRandomString output
			// But we can check that a Location header exists
			checkBody: func(t *testing.T, body []byte) {
				// No body check needed, we'll verify the status code
			},
		},
		{
			name: "missing authorization header",
			path: "/api/test",
			setupRequest: func(req *http.Request) {
				// No auth header
			},
			expectStatus: http.StatusUnauthorized,
			checkBody: func(t *testing.T, body []byte) {
				var response map[string]string
				err := json.Unmarshal(body, &response)
				if err != nil {
					t.Errorf("Failed to parse response: %v", err)
				}
				if response["error"] != "Authorization required" {
					t.Errorf("Expected error 'Authorization required', got %q", response["error"])
				}
			},
		},
		{
			name: "invalid token",
			path: "/api/test",
			setupRequest: func(req *http.Request) {
				req.Header.Set("Authorization", "Bearer invalid-token")
			},
			expectStatus: http.StatusInternalServerError, // Since we can't mock JWKS fetching
		},
	}

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

			// Setup request
			tt.setupRequest(req)

			// Create Echo context
			c := e.NewContext(req, rec)
			c.SetPath(tt.path)

			// Run middleware
			_ = middleware(testHandler)(c)

			// Check status code
			if rec.Code != tt.expectStatus {
				t.Errorf("Expected status code %d, got %d", tt.expectStatus, rec.Code)
			}

			// Check response body if needed
			if tt.checkBody != nil {
				tt.checkBody(t, rec.Body.Bytes())
			}
		})
	}
}