package queryapi_test

import (
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"testing"

	queryapi "queryorchestration/api/queryAPI"
	"queryorchestration/internal/test"

	"github.com/labstack/echo/v4"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

// mockScopeHandler returns an HTTP handler that mocks the Permit.io /v2/api-key/scope endpoint
func mockScopeHandler(t *testing.T) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		response := map[string]string{
			"organization_id": "test-org",
			"project_id":      "test-project",
			"environment_id":  "test-env",
		}
		w.Header().Set("Content-Type", "application/json")
		w.WriteHeader(http.StatusOK)
		err := json.NewEncoder(w).Encode(response)
		require.NoError(t, err)
	}
}

// TestGetIdentity_Success tests successful retrieval of user roles and permissions
func TestGetIdentity_Success(t *testing.T) {
	// Create mock Permit.io server
	roleAssignmentsHandler := func(w http.ResponseWriter, r *http.Request) {
		// Return role assignments for the user
		response := []map[string]interface{}{
			{"role": "auditor", "user": "test-subject-id", "tenant": "default"},
			{"role": "viewer", "user": "test-subject-id", "tenant": "default"},
		}
		w.Header().Set("Content-Type", "application/json")
		w.WriteHeader(http.StatusOK)
		err := json.NewEncoder(w).Encode(response)
		require.NoError(t, err)
	}

	auditorRoleHandler := func(w http.ResponseWriter, r *http.Request) {
		response := map[string]interface{}{
			"key":         "auditor",
			"name":        "Auditor",
			"description": "Read-only access to view documents",
			"permissions": []string{"document:read", "document:list", "export:read"},
		}
		w.Header().Set("Content-Type", "application/json")
		w.WriteHeader(http.StatusOK)
		err := json.NewEncoder(w).Encode(response)
		require.NoError(t, err)
	}

	viewerRoleHandler := func(w http.ResponseWriter, r *http.Request) {
		response := map[string]interface{}{
			"key":         "viewer",
			"name":        "Viewer",
			"description": "Basic viewing permissions",
			"permissions": []string{"document:read"},
		}
		w.Header().Set("Content-Type", "application/json")
		w.WriteHeader(http.StatusOK)
		err := json.NewEncoder(w).Encode(response)
		require.NoError(t, err)
	}

	// Create mock server with routing
	mux := http.NewServeMux()
	mux.HandleFunc("/v2/api-key/scope", mockScopeHandler(t))
	mux.HandleFunc("/v2/facts/test-project/test-env/role_assignments", roleAssignmentsHandler)
	mux.HandleFunc("/v2/schema/test-project/test-env/roles/auditor", auditorRoleHandler)
	mux.HandleFunc("/v2/schema/test-project/test-env/roles/viewer", viewerRoleHandler)

	server := httptest.NewServer(mux)
	defer server.Close()

	// Set environment variable for Permit.io base URL (project/env derived from API key scope)
	t.Setenv("PERMIT_IO_BASE_URL", server.URL)

	// Create controller config
	cfg := &ControllerConfig{}
	test.CreateDB(t, cfg)
	initializeTestConfig(t, cfg)
	cfg.SetPermitIOAPIKey("test-api-key")

	svc := createControllerServices(cfg)
	cons := queryapi.NewControllers(svc, cfg)

	// Create echo context with user claims
	e := echo.New()
	req := httptest.NewRequest(http.MethodGet, "/identity", nil)
	rec := httptest.NewRecorder()
	ctx := e.NewContext(req, rec)

	// Set user claims in context (simulating authenticated user)
	ctx.Set("user_claims", map[string]interface{}{
		"sub": "test-subject-id",
	})

	err := cons.GetIdentity(ctx)
	require.NoError(t, err)
	assert.Equal(t, http.StatusOK, rec.Code)

	var response queryapi.IdentityResponse
	err = json.Unmarshal(rec.Body.Bytes(), &response)
	require.NoError(t, err)

	assert.Len(t, response.Roles, 2)

	// Find auditor role
	var auditorRole *queryapi.IdentityRole
	var viewerRole *queryapi.IdentityRole
	for i := range response.Roles {
		if response.Roles[i].Key == "auditor" {
			auditorRole = &response.Roles[i]
		}
		if response.Roles[i].Key == "viewer" {
			viewerRole = &response.Roles[i]
		}
	}

	require.NotNil(t, auditorRole)
	assert.Equal(t, "Auditor", auditorRole.Name)
	assert.NotNil(t, auditorRole.Description)
	assert.Equal(t, "Read-only access to view documents", *auditorRole.Description)
	assert.Equal(t, []string{"document:read", "document:list", "export:read"}, auditorRole.Permissions)

	require.NotNil(t, viewerRole)
	assert.Equal(t, "Viewer", viewerRole.Name)
	assert.Equal(t, []string{"document:read"}, viewerRole.Permissions)
}

// TestGetIdentity_NoRoles tests user with no roles assigned
func TestGetIdentity_NoRoles(t *testing.T) {
	// Create mock Permit.io server that returns empty roles
	mux := http.NewServeMux()
	mux.HandleFunc("/v2/api-key/scope", mockScopeHandler(t))
	mux.HandleFunc("/v2/facts/test-project/test-env/role_assignments", func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "application/json")
		w.WriteHeader(http.StatusOK)
		_, err := w.Write([]byte(`[]`))
		require.NoError(t, err)
	})

	server := httptest.NewServer(mux)
	defer server.Close()

	t.Setenv("PERMIT_IO_BASE_URL", server.URL)

	cfg := &ControllerConfig{}
	test.CreateDB(t, cfg)
	initializeTestConfig(t, cfg)
	cfg.SetPermitIOAPIKey("test-api-key")

	svc := createControllerServices(cfg)
	cons := queryapi.NewControllers(svc, cfg)

	e := echo.New()
	req := httptest.NewRequest(http.MethodGet, "/identity", nil)
	rec := httptest.NewRecorder()
	ctx := e.NewContext(req, rec)
	ctx.Set("user_claims", map[string]interface{}{
		"sub": "test-subject-id",
	})

	err := cons.GetIdentity(ctx)
	require.NoError(t, err)
	assert.Equal(t, http.StatusOK, rec.Code)

	var response queryapi.IdentityResponse
	err = json.Unmarshal(rec.Body.Bytes(), &response)
	require.NoError(t, err)

	assert.Empty(t, response.Roles)
}

// TestGetIdentity_Unauthorized tests request without authentication
func TestGetIdentity_Unauthorized(t *testing.T) {
	cfg := &ControllerConfig{}
	test.CreateDB(t, cfg)
	initializeTestConfig(t, cfg)
	cfg.SetPermitIOAPIKey("test-api-key")

	svc := createControllerServices(cfg)
	cons := queryapi.NewControllers(svc, cfg)

	e := echo.New()
	req := httptest.NewRequest(http.MethodGet, "/identity", nil)
	rec := httptest.NewRecorder()
	ctx := e.NewContext(req, rec)
	// No user_claims set - simulating unauthenticated request

	err := cons.GetIdentity(ctx)
	require.NoError(t, err)
	assert.Equal(t, http.StatusUnauthorized, rec.Code)

	var response queryapi.ErrorMessage
	err = json.Unmarshal(rec.Body.Bytes(), &response)
	require.NoError(t, err)
	assert.Contains(t, response.Message, "Could not identify user")
}

// TestGetIdentity_PermitAPIError tests handling of Permit.io API errors
func TestGetIdentity_PermitAPIError(t *testing.T) {
	// Create mock server that returns error
	mux := http.NewServeMux()
	mux.HandleFunc("/v2/api-key/scope", mockScopeHandler(t))
	mux.HandleFunc("/v2/facts/test-project/test-env/role_assignments", func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "application/json")
		w.WriteHeader(http.StatusInternalServerError)
		_, err := w.Write([]byte(`{"error": "Internal server error"}`))
		require.NoError(t, err)
	})

	server := httptest.NewServer(mux)
	defer server.Close()

	t.Setenv("PERMIT_IO_BASE_URL", server.URL)

	cfg := &ControllerConfig{}
	test.CreateDB(t, cfg)
	initializeTestConfig(t, cfg)
	cfg.SetPermitIOAPIKey("test-api-key")

	svc := createControllerServices(cfg)
	cons := queryapi.NewControllers(svc, cfg)

	e := echo.New()
	req := httptest.NewRequest(http.MethodGet, "/identity", nil)
	rec := httptest.NewRecorder()
	ctx := e.NewContext(req, rec)
	ctx.Set("user_claims", map[string]interface{}{
		"sub": "test-subject-id",
	})

	err := cons.GetIdentity(ctx)
	require.NoError(t, err)
	assert.Equal(t, http.StatusBadGateway, rec.Code)

	var response queryapi.ErrorMessage
	err = json.Unmarshal(rec.Body.Bytes(), &response)
	require.NoError(t, err)
	assert.Contains(t, response.Message, "Failed to retrieve roles")
}

// TestGetIdentity_RoleDetailsFallback tests graceful degradation when role details cannot be fetched
func TestGetIdentity_RoleDetailsFallback(t *testing.T) {
	// Create mock server where role assignments work but role details fail
	mux := http.NewServeMux()
	mux.HandleFunc("/v2/api-key/scope", mockScopeHandler(t))
	mux.HandleFunc("/v2/facts/test-project/test-env/role_assignments", func(w http.ResponseWriter, r *http.Request) {
		response := []map[string]interface{}{
			{"role": "auditor", "user": "test-subject-id", "tenant": "default"},
		}
		w.Header().Set("Content-Type", "application/json")
		w.WriteHeader(http.StatusOK)
		err := json.NewEncoder(w).Encode(response)
		require.NoError(t, err)
	})
	mux.HandleFunc("/v2/schema/test-project/test-env/roles/auditor", func(w http.ResponseWriter, r *http.Request) {
		// Role details endpoint returns error
		w.Header().Set("Content-Type", "application/json")
		w.WriteHeader(http.StatusNotFound)
		_, err := w.Write([]byte(`{"error": "Role not found"}`))
		require.NoError(t, err)
	})

	server := httptest.NewServer(mux)
	defer server.Close()

	t.Setenv("PERMIT_IO_BASE_URL", server.URL)

	cfg := &ControllerConfig{}
	test.CreateDB(t, cfg)
	initializeTestConfig(t, cfg)
	cfg.SetPermitIOAPIKey("test-api-key")

	svc := createControllerServices(cfg)
	cons := queryapi.NewControllers(svc, cfg)

	e := echo.New()
	req := httptest.NewRequest(http.MethodGet, "/identity", nil)
	rec := httptest.NewRecorder()
	ctx := e.NewContext(req, rec)
	ctx.Set("user_claims", map[string]interface{}{
		"sub": "test-subject-id",
	})

	err := cons.GetIdentity(ctx)
	require.NoError(t, err)
	assert.Equal(t, http.StatusOK, rec.Code)

	var response queryapi.IdentityResponse
	err = json.Unmarshal(rec.Body.Bytes(), &response)
	require.NoError(t, err)

	// Should still return the role, but with fallback values
	require.Len(t, response.Roles, 1)
	assert.Equal(t, "auditor", response.Roles[0].Key)
	assert.Equal(t, "auditor", response.Roles[0].Name) // Fallback to key
	assert.Empty(t, response.Roles[0].Permissions)     // Empty permissions on failure
}