import {
  BadRequestException,
  Body,
  Controller,
  Delete,
  Get,
  NotFoundException,
  Param,
  Patch,
  Post,
  Put,
  Query,
  UnauthorizedException,
  UploadedFile,
  UseGuards,
  UseInterceptors,
} from '@nestjs/common';
import { ApiBearerAuth, ApiTags } from '@nestjs/swagger';
import { FileInterceptor } from '@nestjs/platform-express';
import { unlink } from 'fs/promises';
import { Privileges } from 'src/decorators/privileges.decorator';
import { Scopes } from 'src/decorators/scopes.decorator';
import { CurrentUser } from 'src/decorators/user.decorator';
import { OAuth2Guard } from 'src/guards/oauth2.guard';
import { PrivilegesGuard } from 'src/guards/privileges.guard';
import { ScopesGuard } from 'src/guards/scopes.guard';
import { OAuth2Client } from 'src/modules/objects/oauth2-client/oauth2-client.entity';
import {
  OAuth2ClientURL,
  OAuth2ClientURLType,
} from 'src/modules/objects/oauth2-client/oauth2-client-url.entity';
import { OAuth2ClientService } from 'src/modules/objects/oauth2-client/oauth2-client.service';
import { UploadService } from 'src/modules/objects/upload/upload.service';
import { User } from 'src/modules/objects/user/user.entity';
import { FormUtilityService } from 'src/modules/utility/services/form-utility.service';
import { PaginationService } from 'src/modules/utility/services/paginate.service';
import { TokenService } from 'src/modules/utility/services/token.service';
import { PageOptions } from 'src/types/pagination.interfaces';
import { AdminService } from './admin.service';
import { OAuth2TokenService } from 'src/modules/objects/oauth2-token/oauth2-token.service';
import { Throttle } from '@nestjs/throttler';

const RELATIONS = ['urls', 'picture', 'owner'];
const SET_CLIENT_FIELDS = [
  'title',
  'description',
  'scope',
  'grants',
  'activated',
  'verified',
  'urls',
];

const URL_TYPES = ['redirect_uri', 'terms', 'privacy', 'website'];

const REQUIRED_CLIENT_FIELDS = ['title', 'grants', 'activated'];

@ApiBearerAuth()
@ApiTags('admin')
@Controller('/api/admin/oauth2')
@UseGuards(OAuth2Guard, PrivilegesGuard, ScopesGuard)
export class OAuth2AdminController {
  constructor(
    private _oaClient: OAuth2ClientService,
    private _oaToken: OAuth2TokenService,
    private _service: AdminService,
    private _paginate: PaginationService,
    private _form: FormUtilityService,
    private _token: TokenService,
    private _upload: UploadService,
  ) {}

  @Get('scopes')
  @Scopes('management')
  @Privileges(['admin', 'admin:oauth2'], 'self:oauth2')
  async oauth2Scopes(@CurrentUser() user: User) {
    const reducedPermissions = !this._service.userHasPrivilege(
      user,
      'admin:oauth2',
    );

    return reducedPermissions
      ? this._service.removeUnprivileged(this._oaClient.availableScopes)
      : this._oaClient.availableScopes;
  }

  @Get('grants')
  @Scopes('management')
  @Privileges(['admin', 'admin:oauth2'], 'self:oauth2')
  async oauth2Grants(@CurrentUser() user: User) {
    const reducedPermissions = !this._service.userHasPrivilege(
      user,
      'admin:oauth2',
    );

    return reducedPermissions
      ? this._service.removeUnprivileged(this._oaClient.availableGrantTypes)
      : this._oaClient.availableGrantTypes;
  }

  @Get('clients')
  @Scopes('management')
  @Privileges(['admin', 'admin:oauth2'], 'self:oauth2')
  async oauth2ClientList(
    @Query() options: { q?: string } & PageOptions,
    @CurrentUser() user: User,
  ) {
    if (!this._service.userHasPrivilege(user, 'admin:oauth2')) {
      const unprivileged = await this._oaClient.getClientsByOwner(
        user,
        RELATIONS,
      );

      return {
        pagination: null,
        list: unprivileged.map((item) => this._oaClient.stripClientInfo(item)),
      };
    }

    const search = options.q ? decodeURIComponent(options.q) : null;
    const resultCount = await this._oaClient.searchClientsCount(
      search,
      RELATIONS,
    );

    const pagination = this._paginate.paginate(options, resultCount);

    const [list] = await this._oaClient.searchClients(
      pagination.pageSize,
      pagination.offset,
      search,
      RELATIONS,
    );

    return {
      pagination,
      list: this._form.stripObjectArray(
        list.map((item) => this._oaClient.stripClientInfo(item)),
        ['password'],
      ),
    };
  }

  // New client
  @Post('clients')
  @Scopes('management')
  @Privileges(['admin', 'admin:oauth2'], 'self:oauth2')
  async createNewClient(
    @Body() setter: Partial<OAuth2Client>,
    @CurrentUser() user: User,
  ) {
    const allowedFieldsOnly = this._form.pluckObject(setter, SET_CLIENT_FIELDS);
    const reducedPermissions = !this._service.userHasPrivilege(
      user,
      'admin:oauth2',
    );

    if (!Object.keys(allowedFieldsOnly).length) {
      throw new BadRequestException('Required fields are missing');
    }

    if (REQUIRED_CLIENT_FIELDS.some((field) => setter[field] === undefined)) {
      throw new BadRequestException('Required fields are missing');
    }

    const splitGrants = (allowedFieldsOnly.grants || '')
      .trim()
      .split(' ')
      .filter((item) => item);
    const splitScopes = (allowedFieldsOnly.scope || '')
      .trim()
      .split(' ')
      .filter((item) => item);
    let availableGrantTypes = this._oaClient.availableGrantTypes;
    let availableScopes = this._oaClient.availableScopes;

    if (reducedPermissions) {
      availableGrantTypes =
        this._service.removeUnprivileged(availableGrantTypes);
      availableScopes = this._service.removeUnprivileged(availableScopes);
      allowedFieldsOnly.activated = true;
    }

    if (!splitGrants.every((grant) => availableGrantTypes.includes(grant))) {
      throw new BadRequestException('Bad grant types');
    }

    if (!splitScopes.every((scope) => availableScopes.includes(scope))) {
      throw new BadRequestException('Bad scopes');
    }

    const urls = setter.urls?.slice();
    delete allowedFieldsOnly.urls;

    const client = new OAuth2Client();
    Object.assign(client, allowedFieldsOnly);
    client.client_id = this._token.createUUID();
    client.client_secret = this._token.generateSecret();
    client.owner = user;
    await this._oaClient.updateClient(client);

    if (urls?.length) {
      await this._oaClient.upsertURLs(client, urls);
    }

    return this._oaClient.stripClientInfo(client);
  }

  @Get('clients/:id')
  @Scopes('management')
  @Privileges(['admin', 'admin:oauth2'], 'self:oauth2')
  async oauth2Client(@Param('id') id: string, @CurrentUser() user: User) {
    const client = await this._oaClient.getById(parseInt(id, 10), RELATIONS);
    if (!client) {
      throw new NotFoundException('Client not found');
    }

    if (!this._service.userCanEditClient(user, client)) {
      throw new UnauthorizedException(
        'You do not have permission to view this client',
      );
    }

    return this._oaClient.stripClientInfo(client);
  }

  @Patch('clients/:id')
  @Scopes('management')
  @Privileges(['admin', 'admin:oauth2'], 'self:oauth2')
  async updateOauth2Client(
    @Param('id') id: string,
    @Body() setter: Partial<OAuth2Client>,
    @CurrentUser() user: User,
  ) {
    const client = await this._oaClient.getById(parseInt(id, 10), []);
    const reducedPermissions = !this._service.userHasPrivilege(
      user,
      'admin:oauth2',
    );
    if (!client) {
      throw new NotFoundException('Client not found');
    }

    if (!this._service.userCanEditClient(user, client)) {
      throw new UnauthorizedException(
        'You do not have permission to edit this client',
      );
    }

    const allowedFieldsOnly = this._form.pluckObject(setter, SET_CLIENT_FIELDS);
    const urls = allowedFieldsOnly.urls?.slice();
    delete allowedFieldsOnly.urls;

    // Non-admin cannot change the activated or verified status
    if (reducedPermissions) {
      delete allowedFieldsOnly.activated;
      delete allowedFieldsOnly.verified;
    }

    if (!Object.keys(allowedFieldsOnly).length) {
      return this._oaClient.stripClientInfo(client);
    }

    const splitGrants = (allowedFieldsOnly.grants || '')
      .trim()
      .split(' ')
      .filter((item) => item);
    const splitScopes = (allowedFieldsOnly.scope || '')
      .trim()
      .split(' ')
      .filter((item) => item);
    let availableGrantTypes = this._oaClient.availableGrantTypes;
    let availableScopes = this._oaClient.availableScopes;

    if (reducedPermissions) {
      availableGrantTypes =
        this._service.removeUnprivileged(availableGrantTypes);
      availableScopes = this._service.removeUnprivileged(availableScopes);
      allowedFieldsOnly.activated = true;
    }

    if (!splitGrants.every((grant) => availableGrantTypes.includes(grant))) {
      throw new BadRequestException('Bad grant types');
    }

    if (!splitScopes.every((scope) => availableScopes.includes(scope))) {
      throw new BadRequestException('Bad scopes');
    }

    Object.assign(client, allowedFieldsOnly);
    await this._oaClient.updateClient(client);

    if (urls?.length) {
      await this._oaClient.upsertURLs(client, urls);
    }

    return this._oaClient.stripClientInfo(client);
  }

  @Delete('clients/:id')
  @Scopes('management')
  @Privileges(['admin', 'admin:oauth2'], 'self:oauth2')
  async deleteOauth2Client(@Param('id') id: string, @CurrentUser() user: User) {
    const client = await this._oaClient.getById(parseInt(id, 10), []);
    if (!client) {
      throw new NotFoundException('Client not found');
    }

    if (!this._service.userCanEditClient(user, client)) {
      throw new UnauthorizedException(
        'You do not have permission to edit this client',
      );
    }

    if (client.activated) {
      throw new BadRequestException('Please deactivate the client first.');
    }

    await this._oaClient.deleteClient(client);
    return { success: true };
  }

  @Post('clients/:id/new-secret')
  @Scopes('management')
  @Privileges(['admin', 'admin:oauth2'], 'self:oauth2')
  async createNewSecret(@Param('id') id: string, @CurrentUser() user: User) {
    const client = await this._oaClient.getById(parseInt(id, 10), []);
    if (!client) {
      throw new NotFoundException('Client not found');
    }

    if (!this._service.userCanEditClient(user, client)) {
      throw new UnauthorizedException(
        'You do not have permission to edit this client',
      );
    }

    client.client_secret = this._token.generateSecret();
    await this._oaClient.updateClient(client);

    // security
    await this._oaToken.wipeClientTokens(client);
    await this._oaClient.wipeClientAuthorizations(client);

    return this._oaClient.stripClientInfo(client);
  }

  @Delete('clients/:id/authorizations')
  @Scopes('management')
  @Privileges(['admin', 'admin:oauth2'], 'self:oauth2')
  async deleteClientAuthorizations(
    @Param('id') id: string,
    @CurrentUser() user: User,
  ) {
    const client = await this._oaClient.getById(parseInt(id, 10), []);
    if (!client) {
      throw new NotFoundException('Client not found');
    }

    if (!this._service.userCanEditClient(user, client)) {
      throw new UnauthorizedException(
        'You do not have permission to edit this client',
      );
    }

    await this._oaClient.wipeClientAuthorizations(client);

    return this._oaClient.stripClientInfo(client);
  }

  @Get('clients/:id/urls')
  @Scopes('management')
  @Privileges(['admin', 'admin:oauth2'], 'self:oauth2')
  async oauth2ClientURLs(@Param('id') id: string, @CurrentUser() user: User) {
    const client = await this._oaClient.getById(parseInt(id, 10), ['urls']);
    if (!client) {
      throw new NotFoundException('Client not found');
    }

    if (!this._service.userCanEditClient(user, client)) {
      throw new UnauthorizedException(
        'You do not have permission to edit this client',
      );
    }

    return client.urls;
  }

  @Delete('clients/:id/urls/:url')
  @Scopes('management')
  @Privileges(['admin', 'admin:oauth2'], 'self:oauth2')
  async deleteOAuth2ClientURL(
    @Param('id') id: string,
    @Param('url') urlId: string,
    @CurrentUser() user: User,
  ) {
    const client = await this._oaClient.getById(parseInt(id, 10), ['urls']);
    const parsedURLId = parseInt(urlId, 10);

    if (!client) {
      throw new NotFoundException('Client not found');
    }

    if (!this._service.userCanEditClient(user, client)) {
      throw new UnauthorizedException(
        'You do not have permission to edit this client',
      );
    }

    if (!parsedURLId) {
      throw new BadRequestException('Invalid URL ID');
    }

    const url = await this._oaClient.getClientURLById(parsedURLId);
    if (!url) {
      throw new BadRequestException('Invalid URL');
    }

    client.urls = client.urls.filter((url) => url.id !== parsedURLId);
    await this._oaClient.deleteClientURL(url);
    return client;
  }

  @Put('clients/:id/urls/:url')
  @Scopes('management')
  @Privileges(['admin', 'admin:oauth2'], 'self:oauth2')
  async updateOAuth2ClientURL(
    @Param('id') id: string,
    @Param('url') urlId: string,
    @Body() setter: { url: string; type: string },
    @CurrentUser() user: User,
  ) {
    const client = await this._oaClient.getById(parseInt(id, 10), ['urls']);
    const plucked = this._form.pluckObject(setter, ['url', 'type']);
    const parsedURLId = parseInt(urlId, 10);

    if (!client) {
      throw new NotFoundException('Client not found');
    }

    if (!this._service.userCanEditClient(user, client)) {
      throw new UnauthorizedException(
        'You do not have permission to edit this client',
      );
    }

    if (!parsedURLId) {
      throw new BadRequestException('Invalid URL ID');
    }

    if (!setter.url || !setter.type || !URL_TYPES.includes(setter.type)) {
      throw new NotFoundException('Missing or invalid fields');
    }

    const url = await this._oaClient.getClientURLById(parsedURLId);
    if (!url) {
      throw new BadRequestException('Invalid URL');
    }

    Object.assign(url, plucked);
    await this._oaClient.updateClientURL(url);
    return url;
  }

  @Post('clients/:id/urls')
  @Scopes('management')
  @Privileges(['admin', 'admin:oauth2'], 'self:oauth2')
  async createOAuth2ClientURL(
    @Param('id') id: string,
    @Body() setter: { url: string; type: string },
    @CurrentUser() user: User,
  ) {
    const client = await this._oaClient.getById(parseInt(id, 10), ['urls']);
    if (!client) {
      throw new NotFoundException('Client not found');
    }

    if (!this._service.userCanEditClient(user, client)) {
      throw new UnauthorizedException(
        'You do not have permission to edit this client',
      );
    }

    if (!setter.url || !setter.type || !URL_TYPES.includes(setter.type)) {
      throw new NotFoundException('Missing or invalid fields');
    }

    const url = new OAuth2ClientURL();
    url.client = client;
    url.type = setter.type as OAuth2ClientURLType;
    url.url = setter.url;
    await this._oaClient.updateClientURL(url);

    return url;
  }

  @Throttle(3, 60)
  @Post('clients/:id/picture')
  @Scopes('management')
  @Privileges(['admin', 'admin:oauth2'], 'self:oauth2')
  @UseInterceptors(FileInterceptor('file'))
  async uploadClientPictureFile(
    @CurrentUser() user: User,
    @Param('id') id: string,
    @UploadedFile() file: Express.Multer.File,
  ) {
    const client = await this._oaClient.getById(parseInt(id, 10), ['picture']);

    try {
      if (!client) {
        throw new NotFoundException('Client not found');
      }

      if (!this._service.userCanEditClient(user, client)) {
        throw new UnauthorizedException(
          'You do not have permission to edit this client',
        );
      }

      if (!file) {
        throw new BadRequestException('Picture upload failed');
      }

      const matches = await this._upload.checkImageAspect(file);
      if (!matches) {
        throw new BadRequestException(
          'Picture should be with a 1:1 aspect ratio.',
        );
      }

      const upload = await this._upload.registerUploadedFile(file, user);
      await this._oaClient.updatePicture(client, upload);

      return {
        file: upload.file,
      };
    } catch (e) {
      if (!file.buffer) {
        await unlink(file.path);
      }
      throw e;
    }
  }

  @Delete('clients/:id/picture')
  @Scopes('management')
  @Privileges(['admin', 'admin:oauth2'], 'self:oauth2')
  async deleteClientPictureFile(
    @Param('id') id: string,
    @CurrentUser() user: User,
  ) {
    const client = await this._oaClient.getById(parseInt(id, 10), ['picture']);
    if (!client) {
      throw new NotFoundException('Client not found');
    }

    if (!this._service.userCanEditClient(user, client)) {
      throw new UnauthorizedException(
        'You do not have permission to edit this client',
      );
    }

    this._oaClient.deletePicture(client);
    client.picture = null;
    await this._oaClient.updateClient(client);

    return this._oaClient.stripClientInfo(client);
  }
}