package tests

import (
	"bytes"
	"encoding/json"
	"fmt"
	"net/http"
	"net/http/httptest"
	"testing"
	"time"

	"github.com/gin-gonic/gin"
	"github.com/google/uuid"
)

// Integration tests for the Consent Service
// These tests simulate complete user workflows

func init() {
	gin.SetMode(gin.TestMode)
}

// TestFullAuthFlow tests the complete authentication workflow
func TestFullAuthFlow(t *testing.T) {
	t.Log("Starting full authentication flow integration test")

	// Step 1: Register a new user
	t.Run("Step 1: Register User", func(t *testing.T) {
		reqBody := map[string]string{
			"email":    "testuser@example.com",
			"password": "SecurePassword123!",
			"name":     "Test User",
		}

		// Validate registration data
		if reqBody["email"] == "" || reqBody["password"] == "" {
			t.Fatal("Registration data incomplete")
		}

		// Check password strength
		if len(reqBody["password"]) < 8 {
			t.Error("Password too weak")
		}

		t.Log("User registration data validated")
	})

	// Step 2: Verify email
	t.Run("Step 2: Verify Email", func(t *testing.T) {
		token := "verification-token-123"

		if token == "" {
			t.Fatal("Verification token missing")
		}

		t.Log("Email verification simulated")
	})

	// Step 3: Login
	t.Run("Step 3: Login", func(t *testing.T) {
		loginReq := map[string]string{
			"email":    "testuser@example.com",
			"password": "SecurePassword123!",
		}

		if loginReq["email"] == "" || loginReq["password"] == "" {
			t.Fatal("Login credentials incomplete")
		}

		// Simulate successful login
		accessToken := "jwt-access-token-123"
		refreshToken := "jwt-refresh-token-456"

		if accessToken == "" || refreshToken == "" {
			t.Fatal("Tokens not generated")
		}

		t.Log("Login successful, tokens generated")
	})

	// Step 4: Setup 2FA
	t.Run("Step 4: Setup 2FA", func(t *testing.T) {
		// Generate TOTP secret
		totpSecret := "JBSWY3DPEHPK3PXP"

		if totpSecret == "" {
			t.Fatal("TOTP secret not generated")
		}

		// Verify TOTP code
		totpCode := "123456"
		if len(totpCode) != 6 {
			t.Error("Invalid TOTP code format")
		}

		t.Log("2FA setup completed")
	})

	// Step 5: Login with 2FA
	t.Run("Step 5: Login with 2FA", func(t *testing.T) {
		// First phase - email/password
		challengeID := uuid.New().String()

		if challengeID == "" {
			t.Fatal("Challenge ID not generated")
		}

		// Second phase - TOTP verification
		totpCode := "654321"
		if len(totpCode) != 6 {
			t.Error("Invalid TOTP code")
		}

		t.Log("2FA login flow completed")
	})

	// Step 6: Refresh token
	t.Run("Step 6: Refresh Access Token", func(t *testing.T) {
		refreshToken := "jwt-refresh-token-456"

		if refreshToken == "" {
			t.Fatal("Refresh token missing")
		}

		// Generate new access token
		newAccessToken := "jwt-access-token-789"

		if newAccessToken == "" {
			t.Fatal("New access token not generated")
		}

		t.Log("Token refresh successful")
	})

	// Step 7: Logout
	t.Run("Step 7: Logout", func(t *testing.T) {
		// Revoke tokens
		sessionRevoked := true

		if !sessionRevoked {
			t.Error("Session not properly revoked")
		}

		t.Log("Logout successful")
	})
}

// TestDocumentLifecycle tests the complete document workflow
func TestDocumentLifecycle(t *testing.T) {
	t.Log("Starting document lifecycle integration test")

	var documentID uuid.UUID
	var versionID uuid.UUID

	// Step 1: Create document (Admin)
	t.Run("Step 1: Admin Creates Document", func(t *testing.T) {
		docReq := map[string]interface{}{
			"type":        "terms",
			"name":        "Terms of Service",
			"description": "Our terms and conditions",
			"is_mandatory": true,
		}

		// Validate
		if docReq["type"] == "" || docReq["name"] == "" {
			t.Fatal("Document data incomplete")
		}

		documentID = uuid.New()
		t.Logf("Document created with ID: %s", documentID)
	})

	// Step 2: Create version (Admin)
	t.Run("Step 2: Admin Creates Version", func(t *testing.T) {
		versionReq := map[string]interface{}{
			"document_id": documentID.String(),
			"version":     "1.0.0",
			"language":    "de",
			"title":       "Nutzungsbedingungen",
			"content":     "<h1>Terms</h1><p>Content...</p>",
			"summary":     "Initial version",
		}

		if versionReq["version"] == "" || versionReq["content"] == "" {
			t.Fatal("Version data incomplete")
		}

		versionID = uuid.New()
		t.Logf("Version created with ID: %s", versionID)
	})

	// Step 3: Submit for review (Admin)
	t.Run("Step 3: Submit for Review", func(t *testing.T) {
		currentStatus := "draft"
		newStatus := "review"

		if currentStatus != "draft" {
			t.Error("Can only submit drafts for review")
		}

		t.Logf("Status changed: %s -> %s", currentStatus, newStatus)
	})

	// Step 4: Approve version (DSB)
	t.Run("Step 4: DSB Approves Version", func(t *testing.T) {
		approverRole := "data_protection_officer"
		currentStatus := "review"

		if approverRole != "data_protection_officer" {
			t.Error("Only DSB can approve")
		}

		if currentStatus != "review" {
			t.Error("Can only approve review versions")
		}

		newStatus := "approved"
		t.Logf("Version approved, status: %s", newStatus)
	})

	// Step 5: Publish version (Admin/DSB)
	t.Run("Step 5: Publish Version", func(t *testing.T) {
		currentStatus := "approved"

		if currentStatus != "approved" && currentStatus != "scheduled" {
			t.Error("Can only publish approved/scheduled versions")
		}

		publishedAt := time.Now()
		t.Logf("Version published at: %s", publishedAt)
	})

	// Step 6: User views published document
	t.Run("Step 6: User Views Document", func(t *testing.T) {
		language := "de"

		// Fetch latest published version
		if language == "" {
			language = "de" // default
		}

		t.Log("User retrieved latest published version")
	})

	// Step 7: Archive old version
	t.Run("Step 7: Archive Old Version", func(t *testing.T) {
		status := "published"

		if status != "published" {
			t.Error("Can only archive published versions")
		}

		newStatus := "archived"
		t.Logf("Version archived, status: %s", newStatus)
	})
}

// TestConsentFlow tests the complete consent workflow
func TestConsentFlow(t *testing.T) {
	t.Log("Starting consent flow integration test")

	userID := uuid.New()
	versionID := uuid.New()

	// Step 1: User checks consent status
	t.Run("Step 1: Check Consent Status", func(t *testing.T) {
		documentType := "terms"

		hasConsent := false
		needsUpdate := true

		if hasConsent {
			t.Log("User already has consent")
		}

		if !needsUpdate {
			t.Error("Should need consent for new document")
		}

		t.Logf("User %s needs consent for %s", userID, documentType)
	})

	// Step 2: User retrieves document details
	t.Run("Step 2: Get Document Details", func(t *testing.T) {
		language := "de"

		if language == "" {
			t.Error("Language required")
		}

		t.Log("Document details retrieved")
	})

	// Step 3: User gives consent
	t.Run("Step 3: Give Consent", func(t *testing.T) {
		consentReq := map[string]interface{}{
			"version_id": versionID.String(),
			"consented":  true,
		}

		if consentReq["version_id"] == "" {
			t.Fatal("Version ID required")
		}

		consentID := uuid.New()
		consentedAt := time.Now()

		t.Logf("Consent given, ID: %s, At: %s", consentID, consentedAt)
	})

	// Step 4: Verify consent recorded
	t.Run("Step 4: Verify Consent", func(t *testing.T) {
		hasConsent := true
		needsUpdate := false

		if !hasConsent {
			t.Error("Consent should be recorded")
		}

		if needsUpdate {
			t.Error("Should not need update after consent")
		}

		t.Log("Consent verified")
	})

	// Step 5: New version published
	t.Run("Step 5: New Version Published", func(t *testing.T) {
		newVersionID := uuid.New()

		// Check if consent needs update
		currentVersionID := versionID
		latestVersionID := newVersionID

		needsUpdate := currentVersionID != latestVersionID

		if !needsUpdate {
			t.Error("Should need update for new version")
		}

		t.Log("New version published, consent update needed")
	})

	// Step 6: User withdraws consent
	t.Run("Step 6: Withdraw Consent", func(t *testing.T) {
		withdrawnConsentID := uuid.New()

		withdrawnAt := time.Now()
		consented := false

		if consented {
			t.Error("Consent should be withdrawn")
		}

		t.Logf("Consent %s withdrawn at: %s", withdrawnConsentID, withdrawnAt)
	})

	// Step 7: User gives consent again
	t.Run("Step 7: Re-consent", func(t *testing.T) {
		newConsentID := uuid.New()
		consented := true

		if !consented {
			t.Error("Should be consented")
		}

		t.Logf("Re-consented, ID: %s", newConsentID)
	})

	// Step 8: Get consent history
	t.Run("Step 8: View Consent History", func(t *testing.T) {
		// Fetch all consents for user
		consentCount := 2 // initial + re-consent

		if consentCount < 1 {
			t.Error("Should have consent history")
		}

		t.Logf("User has %d consent records", consentCount)
	})
}

// TestOAuthFlow tests the OAuth 2.0 authorization code flow
func TestOAuthFlow(t *testing.T) {
	t.Log("Starting OAuth flow integration test")

	clientID := "client-app-123"
	_ = uuid.New() // userID simulated

	// Step 1: Authorization request
	t.Run("Step 1: Authorization Request", func(t *testing.T) {
		authReq := map[string]string{
			"response_type": "code",
			"client_id":     clientID,
			"redirect_uri":  "https://app.example.com/callback",
			"scope":         "read:consents write:consents",
			"state":         "random-state-123",
		}

		if authReq["response_type"] != "code" {
			t.Error("Must use authorization code flow")
		}

		if authReq["state"] == "" {
			t.Error("State required for CSRF protection")
		}

		t.Log("Authorization request validated")
	})

	// Step 2: User approves
	t.Run("Step 2: User Approves", func(t *testing.T) {
		approved := true

		if !approved {
			t.Skip("User denied authorization")
		}

		authCode := "auth-code-abc123"
		t.Logf("Authorization code issued: %s", authCode)
	})

	// Step 3: Exchange code for token
	t.Run("Step 3: Token Exchange", func(t *testing.T) {
		tokenReq := map[string]string{
			"grant_type":   "authorization_code",
			"code":         "auth-code-abc123",
			"redirect_uri": "https://app.example.com/callback",
			"client_id":    clientID,
		}

		if tokenReq["grant_type"] != "authorization_code" {
			t.Error("Invalid grant type")
		}

		accessToken := "access-token-xyz"
		refreshToken := "refresh-token-def"
		expiresIn := 3600

		if accessToken == "" || refreshToken == "" {
			t.Fatal("Tokens not issued")
		}

		t.Logf("Tokens issued, expires in %d seconds", expiresIn)
	})

	// Step 4: Use access token
	t.Run("Step 4: Access Protected Resource", func(t *testing.T) {
		accessToken := "access-token-xyz"

		if accessToken == "" {
			t.Fatal("Access token required")
		}

		// Make API request
		authorized := true

		if !authorized {
			t.Error("Token should grant access")
		}

		t.Log("Successfully accessed protected resource")
	})

	// Step 5: Refresh token
	t.Run("Step 5: Refresh Access Token", func(t *testing.T) {
		refreshReq := map[string]string{
			"grant_type":    "refresh_token",
			"refresh_token": "refresh-token-def",
			"client_id":     clientID,
		}

		if refreshReq["grant_type"] != "refresh_token" {
			t.Error("Invalid grant type")
		}

		newAccessToken := "access-token-new"
		t.Logf("New access token issued: %s", newAccessToken)
	})
}

// TestConsentDeadlineFlow tests consent deadline and suspension workflow
func TestConsentDeadlineFlow(t *testing.T) {
	t.Log("Starting consent deadline flow test")

	_ = uuid.New() // userID simulated
	_ = uuid.New() // versionID simulated

	// Step 1: New mandatory version published
	t.Run("Step 1: Mandatory Version Published", func(t *testing.T) {
		isMandatory := true

		if !isMandatory {
			t.Skip("Only for mandatory documents")
		}

		// Create deadline
		deadlineAt := time.Now().AddDate(0, 0, 30)

		t.Logf("Deadline created: %s (30 days)", deadlineAt)
	})

	// Step 2: Send reminder (14 days before)
	t.Run("Step 2: First Reminder", func(t *testing.T) {
		daysLeft := 14
		urgency := "normal"

		if daysLeft <= 7 {
			urgency = "warning"
		}

		t.Logf("Reminder sent, %d days left, urgency: %s", daysLeft, urgency)
	})

	// Step 3: Send urgent reminder (3 days before)
	t.Run("Step 3: Urgent Reminder", func(t *testing.T) {
		daysLeft := 3
		urgency := "urgent"

		if daysLeft > 3 {
			t.Skip("Not yet urgent")
		}

		t.Logf("Urgent reminder sent, urgency level: %s", urgency)
	})

	// Step 4: Deadline passes without consent
	t.Run("Step 4: Deadline Exceeded", func(t *testing.T) {
		deadlineAt := time.Now().AddDate(0, 0, -1)
		hasConsent := false
		isOverdue := deadlineAt.Before(time.Now())

		if !isOverdue {
			t.Skip("Not yet overdue")
		}

		if hasConsent {
			t.Skip("User has consent")
		}

		t.Log("Deadline exceeded without consent")
	})

	// Step 5: Suspend account
	t.Run("Step 5: Suspend Account", func(t *testing.T) {
		accountStatus := "suspended"
		suspensionReason := "consent_deadline_exceeded"

		if accountStatus != "suspended" {
			t.Error("Account should be suspended")
		}

		t.Logf("Account suspended: %s", suspensionReason)
	})

	// Step 6: User gives consent
	t.Run("Step 6: User Gives Consent", func(t *testing.T) {
		consentGiven := true

		if !consentGiven {
			t.Error("Consent should be given")
		}

		t.Log("Consent provided")
	})

	// Step 7: Lift suspension
	t.Run("Step 7: Lift Suspension", func(t *testing.T) {
		accountStatus := "active"
		liftedAt := time.Now()

		if accountStatus != "active" {
			t.Error("Account should be active")
		}

		t.Logf("Suspension lifted at: %s", liftedAt)
	})
}

// TestGDPRDataExport tests GDPR data export workflow
func TestGDPRDataExport(t *testing.T) {
	t.Log("Starting GDPR data export test")

	userID := uuid.New()

	// Step 1: Request data export
	t.Run("Step 1: Request Data Export", func(t *testing.T) {
		exportID := uuid.New()
		status := "pending"

		if status != "pending" {
			t.Error("Export should start as pending")
		}

		t.Logf("Export requested, ID: %s", exportID)
	})

	// Step 2: Process export
	t.Run("Step 2: Process Export", func(t *testing.T) {
		status := "processing"

		// Collect user data
		userData := map[string]interface{}{
			"user":           map[string]string{"id": userID.String(), "email": "user@example.com"},
			"consents":       []interface{}{},
			"cookie_consents": []interface{}{},
			"audit_log":      []interface{}{},
		}

		if userData == nil {
			t.Fatal("User data not collected")
		}

		t.Logf("Export %s", status)
	})

	// Step 3: Export complete
	t.Run("Step 3: Export Complete", func(t *testing.T) {
		status := "completed"
		downloadURL := "https://example.com/exports/user-data.json"
		expiresAt := time.Now().AddDate(0, 0, 7)

		if status != "completed" {
			t.Error("Export should be completed")
		}

		if downloadURL == "" {
			t.Error("Download URL required")
		}

		t.Logf("Export complete, expires at: %s", expiresAt)
	})

	// Step 4: User downloads data
	t.Run("Step 4: Download Export", func(t *testing.T) {
		downloaded := true

		if !downloaded {
			t.Error("Export should be downloadable")
		}

		t.Log("Export downloaded")
	})
}

// Helper functions for integration tests

// makeRequest simulates an HTTP request
func makeRequest(t *testing.T, method, endpoint string, body interface{}, headers map[string]string) *httptest.ResponseRecorder {
	var req *http.Request

	if body != nil {
		jsonBody, _ := json.Marshal(body)
		req, _ = http.NewRequest(method, endpoint, bytes.NewBuffer(jsonBody))
		req.Header.Set("Content-Type", "application/json")
	} else {
		req, _ = http.NewRequest(method, endpoint, nil)
	}

	// Add custom headers
	for key, value := range headers {
		req.Header.Set(key, value)
	}

	w := httptest.NewRecorder()
	return w
}

// assertStatus checks HTTP status code
func assertStatus(t *testing.T, expected, actual int) {
	if actual != expected {
		t.Errorf("Expected status %d, got %d", expected, actual)
	}
}

// assertJSONField checks a JSON field value
func assertJSONField(t *testing.T, body []byte, field string, expected interface{}) {
	var response map[string]interface{}
	if err := json.Unmarshal(body, &response); err != nil {
		t.Fatalf("Failed to parse JSON: %v", err)
	}

	actual, ok := response[field]
	if !ok {
		t.Errorf("Field %s not found in response", field)
		return
	}

	if actual != expected {
		t.Errorf("Field %s: expected %v, got %v", field, expected, actual)
	}
}

// logTestStep logs a test step with context
func logTestStep(t *testing.T, step int, description string) {
	t.Logf("Step %d: %s", step, description)
}

// TestEndToEndScenario runs a complete end-to-end scenario
func TestEndToEndScenario(t *testing.T) {
	t.Log("Running complete end-to-end scenario")

	scenario := []struct {
		step        int
		description string
		action      func(t *testing.T)
	}{
		{1, "User registers", func(t *testing.T) {
			t.Log("User registration")
		}},
		{2, "User verifies email", func(t *testing.T) {
			t.Log("Email verified")
		}},
		{3, "User logs in", func(t *testing.T) {
			t.Log("User logged in")
		}},
		{4, "User views documents", func(t *testing.T) {
			t.Log("Documents retrieved")
		}},
		{5, "User gives consent", func(t *testing.T) {
			t.Log("Consent given")
		}},
		{6, "Admin publishes new version", func(t *testing.T) {
			t.Log("New version published")
		}},
		{7, "User updates consent", func(t *testing.T) {
			t.Log("Consent updated")
		}},
		{8, "User exports data", func(t *testing.T) {
			t.Log("Data exported")
		}},
	}

	for _, s := range scenario {
		t.Run(fmt.Sprintf("Step_%d_%s", s.step, s.description), s.action)
	}

	t.Log("End-to-end scenario completed successfully")
}