package api

import (
	"io"
	"log/slog"
	"net/http"
	"net/http/httptest"
	"testing"

	"gardomatic.kleiax.de/internal/storage"
)

func TestGardenRolePermissions(t *testing.T) {
	tests := []struct {
		role       storage.GardenRole
		permission storage.GardenPermission
		want       int
	}{
		{storage.GardenRoleOwner, storage.GardenPermissionGardenDelete, http.StatusNoContent},
		{storage.GardenRoleAdmin, storage.GardenPermissionMembersWrite, http.StatusNoContent},
		{storage.GardenRoleAdmin, storage.GardenPermissionGardenDelete, http.StatusForbidden},
		{storage.GardenRoleMember, storage.GardenPermissionPlantUpdateOwn, http.StatusNoContent},
		{storage.GardenRoleMember, storage.GardenPermissionSpeciesWrite, http.StatusForbidden},
		{storage.GardenRoleViewer, storage.GardenPermissionPlantUpdateOwn, http.StatusForbidden},
		{storage.GardenRoleWorker, storage.GardenPermissionTaskCompleteOther, http.StatusNoContent},
		{storage.GardenRoleWorker, storage.GardenPermissionTaskUpdateOther, http.StatusForbidden},
	}
	app := &application{logger: slog.New(slog.NewTextHandler(io.Discard, nil))}
	for _, tt := range tests {
		t.Run(string(tt.role)+"/"+string(tt.permission), func(t *testing.T) {
			next := http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) { w.WriteHeader(http.StatusNoContent) })
			handler := app.requireGardenPermission(tt.permission, next)
			request := httptest.NewRequest(http.MethodPost, "/", nil)
			request = app.contextSetGardenMember(request, storage.GardenMember{Role: tt.role})
			response := httptest.NewRecorder()
			handler.ServeHTTP(response, request)
			if response.Code != tt.want {
				t.Fatalf("status = %d, want %d", response.Code, tt.want)
			}
		})
	}
}

func TestPersistedGardenAdminWildcardDoesNotGrantOwnershipRights(t *testing.T) {
	member := storage.GardenMember{Role: storage.GardenRoleAdmin, Permissions: []storage.GardenPermission{"garden:*"}}
	if member.Can(storage.GardenPermissionGardenDelete) {
		t.Fatal("garden:* must not grant the owner-only garden:delete permission")
	}
	if !member.Can(storage.GardenPermissionMembersWrite) {
		t.Fatal("garden:* must grant ordinary garden administration permissions")
	}
}

func TestGardenPermissionOverridesResolveWildcards(t *testing.T) {
	permissions := storage.ResolveGardenPermissions([]string{"garden:*"}, []storage.GardenRolePermissionOverride{{Permission: string(storage.GardenPermissionMembersWrite), Granted: false}, {Permission: string(storage.GardenPermissionGardenDelete), Granted: true}})
	member := storage.GardenMember{Permissions: permissions}
	if member.Can(storage.GardenPermissionMembersWrite) || !member.Can(storage.GardenPermissionGardenDelete) {
		t.Fatalf("unexpected effective permissions: %v", permissions)
	}
}

func TestGardenRoleBundlesConcretePermissions(t *testing.T) {
	member := storage.GardenRoleMember.Permissions()
	found := false
	for _, permission := range member {
		if permission == storage.GardenPermissionPlantUpdateOther {
			found = true
		}
	}
	if found {
		t.Fatal("member role must not bundle permissions for other users' plants")
	}
	if len(storage.GardenRoleAdmin.Permissions()) <= len(member) {
		t.Fatal("admin role must bundle more permissions than member")
	}
}

func TestGardenResourcePermissionsDistinguishOwnAndOtherObjects(t *testing.T) {
	app := &application{logger: slog.New(slog.NewTextHandler(io.Discard, nil))}
	tests := []struct {
		name      string
		role      storage.GardenRole
		createdBy int
		want      int
	}{
		{"member may update own plant", storage.GardenRoleMember, 7, http.StatusNoContent},
		{"member may not update another plant", storage.GardenRoleMember, 8, http.StatusForbidden},
		{"admin may update another plant", storage.GardenRoleAdmin, 8, http.StatusNoContent},
		{"viewer may read another task", storage.GardenRoleViewer, 8, http.StatusNoContent},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			request := httptest.NewRequest(http.MethodPatch, "/", nil)
			request = app.contextSetAuthenticatedUser(request, storage.User{ID: 7})
			request = app.contextSetGardenMember(request, storage.GardenMember{Role: tt.role})
			response := httptest.NewRecorder()
			own, other := storage.GardenPermissionPlantUpdateOwn, storage.GardenPermissionPlantUpdateOther
			if tt.role == storage.GardenRoleViewer {
				own, other = storage.GardenPermissionTaskReadOwn, storage.GardenPermissionTaskReadOther
			}
			if app.authorizeGardenResource(response, request, tt.createdBy, own, other) {
				response.WriteHeader(http.StatusNoContent)
			}
			if response.Code != tt.want {
				t.Fatalf("status = %d, want %d", response.Code, tt.want)
			}
		})
	}
}

func TestApplicationRolePermissions(t *testing.T) {
	if !storage.ApplicationRoleAdmin.Can(storage.ApplicationPermissionGlobalSpeciesWrite) {
		t.Fatal("admin role must grant global species write permission")
	}
	if storage.ApplicationRoleUser.Can(storage.ApplicationPermissionGlobalSpeciesWrite) {
		t.Fatal("user role must not grant global species write permission")
	}
	if !storage.ApplicationRoleUser.Can(storage.ApplicationPermissionGardensCreate) || !storage.ApplicationRoleAdmin.Can(storage.ApplicationPermissionGardensCreate) {
		t.Fatal("built-in application roles must retain permission to create gardens")
	}
	if !storage.ApplicationRoleAdmin.Valid() || !storage.ApplicationRoleUser.Valid() || storage.ApplicationRole("unknown").Valid() {
		t.Fatal("application role validation returned an unexpected result")
	}
}

func TestRequireApplicationPermission(t *testing.T) {
	app := &application{logger: slog.New(slog.NewTextHandler(io.Discard, nil))}
	next := http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) { w.WriteHeader(http.StatusNoContent) })
	handler := app.requireApplicationPermission(storage.ApplicationPermissionUsersManage, next)
	for _, test := range []struct {
		name string
		user storage.User
		want int
	}{
		{"admin role", storage.User{Role: storage.ApplicationRoleAdmin, Permissions: storage.ApplicationRoleAdmin.Permissions()}, http.StatusNoContent},
		{"user role", storage.User{Role: storage.ApplicationRoleUser, Permissions: storage.ApplicationRoleUser.Permissions()}, http.StatusForbidden},
		{"custom server role", storage.User{Role: "application:user-manager", Permissions: []storage.ApplicationPermission{storage.ApplicationPermissionUsersManage}}, http.StatusNoContent},
	} {
		request := httptest.NewRequest(http.MethodGet, "/v1/admin/users", nil)
		request = app.contextSetAuthenticatedUser(request, test.user)
		response := httptest.NewRecorder()
		handler.ServeHTTP(response, request)
		if response.Code != test.want {
			t.Errorf("%s: got %d, want %d", test.name, response.Code, test.want)
		}
	}
}