import { Request, Response } from 'express';
import Controller from '../controller';
import { ADMIN, NONE } from '../../types/permissions';
import UserService from '../../services/user-service';
import { AccountService } from '../../services/account-service';
import { AccessService } from '../../services/access-service';
import { Logger } from '../../logger';
import { IUnleashConfig, IUnleashServices, RoleName } from '../../types';
import { EmailService } from '../../services/email-service';
import ResetTokenService from '../../services/reset-token-service';
import { IAuthRequest } from '../unleash-types';
import SettingService from '../../services/setting-service';
import { IUser, SimpleAuthSettings } from '../../server-impl';
import { simpleAuthSettingsKey } from '../../types/settings/simple-auth-settings';
import { anonymise } from '../../util/anonymise';
import { OpenApiService } from '../../services/openapi-service';
import { createRequestSchema } from '../../openapi/util/create-request-schema';
import {
    createResponseSchema,
    resourceCreatedResponseSchema,
} from '../../openapi/util/create-response-schema';
import { userSchema, UserSchema } from '../../openapi/spec/user-schema';
import { serializeDates } from '../../types/serialize-dates';
import { usersSchema, UsersSchema } from '../../openapi/spec/users-schema';
import {
    usersSearchSchema,
    UsersSearchSchema,
} from '../../openapi/spec/users-search-schema';
import { CreateUserSchema } from '../../openapi/spec/create-user-schema';
import { UpdateUserSchema } from '../../openapi/spec/update-user-schema';
import { PasswordSchema } from '../../openapi/spec/password-schema';
import { IdSchema } from '../../openapi/spec/id-schema';
import {
    resetPasswordSchema,
    ResetPasswordSchema,
} from '../../openapi/spec/reset-password-schema';
import {
    emptyResponse,
    getStandardResponses,
} from '../../openapi/util/standard-responses';
import { GroupService } from '../../services/group-service';
import {
    UsersGroupsBaseSchema,
    usersGroupsBaseSchema,
} from '../../openapi/spec/users-groups-base-schema';
import { IGroup } from '../../types/group';
import { IFlagResolver } from '../../types/experimental';
import rateLimit from 'express-rate-limit';
import { minutesToMilliseconds } from 'date-fns';
import {
    AdminCountSchema,
    adminCountSchema,
} from '../../openapi/spec/admin-count-schema';
import { BadDataError } from '../../error';
import {
    createUserResponseSchema,
    CreateUserResponseSchema,
} from '../../openapi/spec/create-user-response-schema';

export default class UserAdminController extends Controller {
    private flagResolver: IFlagResolver;

    private userService: UserService;

    private accountService: AccountService;

    private accessService: AccessService;

    private readonly logger: Logger;

    private emailService: EmailService;

    private resetTokenService: ResetTokenService;

    private settingService: SettingService;

    private openApiService: OpenApiService;

    private groupService: GroupService;

    readonly unleashUrl: string;

    constructor(
        config: IUnleashConfig,
        {
            userService,
            accountService,
            accessService,
            emailService,
            resetTokenService,
            settingService,
            openApiService,
            groupService,
        }: Pick<
            IUnleashServices,
            | 'userService'
            | 'accountService'
            | 'accessService'
            | 'emailService'
            | 'resetTokenService'
            | 'settingService'
            | 'openApiService'
            | 'groupService'
        >,
    ) {
        super(config);
        this.userService = userService;
        this.accountService = accountService;
        this.accessService = accessService;
        this.emailService = emailService;
        this.resetTokenService = resetTokenService;
        this.settingService = settingService;
        this.openApiService = openApiService;
        this.groupService = groupService;
        this.logger = config.getLogger('routes/user-controller.ts');
        this.unleashUrl = config.server.unleashUrl;
        this.flagResolver = config.flagResolver;

        this.route({
            method: 'post',
            path: '/validate-password',
            handler: this.validateUserPassword,
            permission: NONE,
            middleware: [
                openApiService.validPath({
                    tags: ['Users'],
                    operationId: 'validateUserPassword',
                    summary: 'Validate password for a user',
                    description:
                        'Validate the password strength. Minimum 10 characters, uppercase letter, number, special character.',
                    requestBody: createRequestSchema('passwordSchema'),
                    responses: {
                        200: emptyResponse,
                        ...getStandardResponses(400, 401, 415),
                    },
                }),
            ],
        });

        this.route({
            method: 'post',
            path: '/:id/change-password',
            handler: this.changeUserPassword,
            permission: ADMIN,
            middleware: [
                openApiService.validPath({
                    tags: ['Users'],
                    operationId: 'changeUserPassword',
                    summary: 'Change password for a user',
                    description: 'Change password for a user as an admin',
                    requestBody: createRequestSchema('passwordSchema'),
                    responses: {
                        200: emptyResponse,
                        ...getStandardResponses(400, 401, 403),
                    },
                }),
            ],
        });

        this.route({
            method: 'post',
            path: '/reset-password',
            handler: this.resetUserPassword,
            permission: ADMIN,
            middleware: [
                openApiService.validPath({
                    tags: ['Users'],
                    operationId: 'resetUserPassword',
                    summary: 'Reset user password',
                    description: 'Reset user password as an admin',
                    requestBody: createRequestSchema('idSchema'),
                    responses: {
                        200: createResponseSchema('resetPasswordSchema'),
                        ...getStandardResponses(400, 401, 403, 404),
                    },
                }),
            ],
        });

        this.route({
            method: 'get',
            path: '',
            handler: this.getUsers,
            permission: ADMIN,
            middleware: [
                openApiService.validPath({
                    tags: ['Users'],
                    operationId: 'getUsers',
                    summary:
                        'Get all users and [root roles](https://docs.getunleash.io/reference/rbac#predefined-roles)',
                    description:
                        'Will return all users and all available root roles for the Unleash instance.',
                    responses: {
                        200: createResponseSchema('usersSchema'),
                        ...getStandardResponses(401, 403),
                    },
                }),
            ],
        });

        this.route({
            method: 'get',
            path: '/search',
            handler: this.searchUsers,
            permission: NONE,
            middleware: [
                openApiService.validPath({
                    tags: ['Users'],
                    operationId: 'searchUsers',
                    summary: 'Search users',
                    description:
                        ' It will preform a simple search based on name and email matching the given query. Requires minimum 2 characters',
                    parameters: [
                        {
                            name: 'q',
                            description:
                                'The pattern to search in the username or email',
                            schema: { type: 'string' },
                            in: 'query',
                        },
                    ],
                    responses: {
                        200: createResponseSchema('usersSchema'),
                        ...getStandardResponses(401),
                    },
                }),
            ],
        });

        this.route({
            method: 'get',
            path: '/access',
            handler: this.getBaseUsersAndGroups,
            permission: NONE,
            middleware: [
                openApiService.validPath({
                    tags: ['Users'],
                    operationId: 'getBaseUsersAndGroups',
                    summary: 'Get basic user and group information',
                    description:
                        'Get a subset of user and group information eligible even for non-admin users',
                    responses: {
                        200: createResponseSchema('usersGroupsBaseSchema'),
                        ...getStandardResponses(401),
                    },
                }),
            ],
        });

        this.route({
            method: 'get',
            path: '/admin-count',
            handler: this.getAdminCount,
            permission: ADMIN,
            middleware: [
                openApiService.validPath({
                    tags: ['Users'],
                    operationId: 'getAdminCount',
                    summary: 'Get total count of admin accounts',
                    description:
                        'Get a total count of admins with password, without password and admin service accounts',
                    responses: {
                        200: createResponseSchema('adminCountSchema'),
                        ...getStandardResponses(401, 403),
                    },
                }),
            ],
        });

        this.route({
            method: 'post',
            path: '',
            handler: this.createUser,
            permission: ADMIN,
            middleware: [
                openApiService.validPath({
                    tags: ['Users'],
                    operationId: 'createUser',
                    summary: 'Create a new user',
                    description: 'Creates a new user with the given root role.',
                    requestBody: createRequestSchema('createUserSchema'),
                    responses: {
                        201: resourceCreatedResponseSchema(
                            'createUserResponseSchema',
                        ),
                        ...getStandardResponses(400, 401, 403),
                    },
                }),
                rateLimit({
                    windowMs: minutesToMilliseconds(1),
                    max: 20,
                    validate: false,
                    standardHeaders: true,
                    legacyHeaders: false,
                }),
            ],
        });

        this.route({
            method: 'get',
            path: '/:id',
            handler: this.getUser,
            permission: ADMIN,
            middleware: [
                openApiService.validPath({
                    tags: ['Users'],
                    operationId: 'getUser',
                    summary: 'Get user',
                    description: 'Will return a single user by id',
                    responses: {
                        200: createResponseSchema('userSchema'),
                        ...getStandardResponses(400, 401, 404),
                    },
                }),
            ],
        });

        this.route({
            method: 'put',
            path: '/:id',
            handler: this.updateUser,
            permission: ADMIN,
            middleware: [
                openApiService.validPath({
                    tags: ['Users'],
                    operationId: 'updateUser',
                    summary: 'Update a user',
                    description:
                        'Only the explicitly specified fields get updated.',
                    requestBody: createRequestSchema('updateUserSchema'),
                    responses: {
                        200: createResponseSchema('createUserResponseSchema'),
                        ...getStandardResponses(400, 401, 403, 404),
                    },
                }),
            ],
        });

        this.route({
            method: 'delete',
            path: '/:id',
            acceptAnyContentType: true,
            handler: this.deleteUser,
            permission: ADMIN,
            middleware: [
                openApiService.validPath({
                    tags: ['Users'],
                    operationId: 'deleteUser',
                    summary: 'Delete a user',
                    description: 'Deletes the user with the given userId',
                    responses: {
                        200: emptyResponse,
                        ...getStandardResponses(401, 403, 404),
                    },
                }),
            ],
        });
    }

    async resetUserPassword(
        req: IAuthRequest<unknown, ResetPasswordSchema, IdSchema>,
        res: Response<ResetPasswordSchema>,
    ): Promise<void> {
        const { user } = req;
        const receiver = req.body.id;
        const resetPasswordUrl =
            await this.userService.createResetPasswordEmail(receiver, user);

        this.openApiService.respondWithValidation(
            200,
            res,
            resetPasswordSchema.$id,
            { resetPasswordUrl: resetPasswordUrl.toString() },
        );
    }

    async getUsers(req: Request, res: Response<UsersSchema>): Promise<void> {
        const users = await this.userService.getAll();
        const rootRoles = await this.accessService.getRootRoles();
        const inviteLinks = await this.resetTokenService.getActiveInvitations();

        const usersWithInviteLinks = users.map((user) => {
            const inviteLink = inviteLinks[user.id] || '';
            return { ...user, inviteLink };
        });

        this.openApiService.respondWithValidation(200, res, usersSchema.$id, {
            users: serializeDates(usersWithInviteLinks),
            rootRoles,
        });
    }

    anonymiseUsers(users: IUser[]): IUser[] {
        return users.map((u) => ({
            ...u,
            name: anonymise(u.name),
            username: anonymise(u.username),
            email: anonymise(u.email || 'random'),
            imageUrl:
                'https://gravatar.com/avatar/21232f297a57a5a743894a0e4a801fc3?size=42&default=retro',
        }));
    }

    async searchUsers(
        req: Request,
        res: Response<UsersSearchSchema>,
    ): Promise<void> {
        const { q } = req.query;
        let users =
            typeof q === 'string' && q.length > 1
                ? await this.userService.search(q)
                : [];
        if (this.flagResolver.isEnabled('anonymiseEventLog')) {
            users = this.anonymiseUsers(users);
        }
        this.openApiService.respondWithValidation(
            200,
            res,
            usersSearchSchema.$id,
            serializeDates(users),
        );
    }

    async getBaseUsersAndGroups(
        req: Request,
        res: Response<UsersGroupsBaseSchema>,
    ): Promise<void> {
        let allUsers = await this.accountService.getAll();
        let users = allUsers.map((u) => {
            return {
                id: u.id,
                name: u.name,
                username: u.username,
                email: u.email,
                accountType: u.accountType,
            } as IUser;
        });
        if (this.flagResolver.isEnabled('anonymiseEventLog')) {
            users = this.anonymiseUsers(users);
        }

        let allGroups = await this.groupService.getAll();
        let groups = allGroups.map((g) => {
            return {
                id: g.id,
                name: g.name,
                userCount: g.users.length,
                rootRole: g.rootRole,
            } as IGroup;
        });
        this.openApiService.respondWithValidation(
            200,
            res,
            usersGroupsBaseSchema.$id,
            {
                users: serializeDates(users),
                groups: serializeDates(groups),
            },
        );
    }

    async getUser(req: Request, res: Response<UserSchema>): Promise<void> {
        const { id } = req.params;
        if (!Number.isInteger(Number(id))) {
            throw new BadDataError('User id should be an integer');
        }
        const user = await this.userService.getUser(Number(id));

        this.openApiService.respondWithValidation(
            200,
            res,
            userSchema.$id,
            serializeDates(user),
        );
    }

    async createUser(
        req: IAuthRequest<unknown, unknown, CreateUserSchema>,
        res: Response<CreateUserResponseSchema>,
    ): Promise<void> {
        const { username, email, name, rootRole, sendEmail, password } =
            req.body;
        const { user } = req;
        const normalizedRootRole = Number.isInteger(Number(rootRole))
            ? Number(rootRole)
            : (rootRole as RoleName);

        const createdUser = await this.userService.createUser(
            {
                username,
                email,
                name,
                password,
                rootRole: normalizedRootRole,
            },
            user,
        );

        const passwordAuthSettings =
            await this.settingService.get<SimpleAuthSettings>(
                simpleAuthSettingsKey,
            );

        let inviteLink: string;
        if (!passwordAuthSettings?.disabled) {
            const inviteUrl = await this.resetTokenService.createNewUserUrl(
                createdUser.id,
                user.email,
            );
            inviteLink = inviteUrl.toString();
        }

        let emailSent = false;
        const emailConfigured = this.emailService.configured();
        const reallySendEmail =
            emailConfigured && (sendEmail !== undefined ? sendEmail : true);

        if (reallySendEmail) {
            try {
                await this.emailService.sendGettingStartedMail(
                    createdUser.name,
                    createdUser.email,
                    this.unleashUrl,
                    inviteLink,
                );
                emailSent = true;
            } catch (e) {
                this.logger.warn(
                    'email was configured, but sending failed due to: ',
                    e,
                );
            }
        } else {
            this.logger.warn(
                'email was not sent to the user because email configuration is lacking',
            );
        }

        const responseData: CreateUserResponseSchema = {
            ...serializeDates(createdUser),
            inviteLink: inviteLink || this.unleashUrl,
            emailSent,
            rootRole: normalizedRootRole,
        };

        this.openApiService.respondWithValidation(
            201,
            res,
            createUserResponseSchema.$id,
            responseData,
            { location: `${responseData.id}` },
        );
    }

    async updateUser(
        req: IAuthRequest<
            { id: string },
            CreateUserResponseSchema,
            UpdateUserSchema
        >,
        res: Response<CreateUserResponseSchema>,
    ): Promise<void> {
        const { user, params, body } = req;
        const { id } = params;
        const { name, email, rootRole } = body;
        if (!Number.isInteger(Number(id))) {
            throw new BadDataError('User id should be an integer');
        }
        const normalizedRootRole = Number.isInteger(Number(rootRole))
            ? Number(rootRole)
            : (rootRole as RoleName);

        const updateUser = await this.userService.updateUser(
            {
                id: Number(id),
                name,
                email,
                rootRole: normalizedRootRole,
            },
            user,
        );

        this.openApiService.respondWithValidation(
            200,
            res,
            createUserResponseSchema.$id,
            {
                ...serializeDates(updateUser),
                rootRole: normalizedRootRole,
            },
        );
    }

    async deleteUser(req: IAuthRequest, res: Response): Promise<void> {
        const { user, params } = req;
        const { id } = params;
        if (!Number.isInteger(Number(id))) {
            throw new BadDataError('User id should be an integer');
        }

        await this.userService.deleteUser(+id, user);
        res.status(200).send();
    }

    async validateUserPassword(
        req: IAuthRequest<unknown, unknown, PasswordSchema>,
        res: Response,
    ): Promise<void> {
        const { password } = req.body;

        this.userService.validatePassword(password);
        res.status(200).send();
    }

    async changeUserPassword(
        req: IAuthRequest<{ id: string }, unknown, PasswordSchema>,
        res: Response,
    ): Promise<void> {
        const { id } = req.params;
        const { password } = req.body;

        await this.userService.changePassword(+id, password);
        res.status(200).send();
    }

    async getAdminCount(
        req: Request,
        res: Response<AdminCountSchema>,
    ): Promise<void> {
        const adminCount = await this.accountService.getAdminCount();

        this.openApiService.respondWithValidation(
            200,
            res,
            adminCountSchema.$id,
            adminCount,
        );
    }
}