import { Ability, AbilityBuilder, AbilityClass } from '@casl/ability';
import { Injectable } from '@nestjs/common';
import { pricing } from '@gitroom/nestjs-libraries/database/prisma/subscriptions/pricing';
import { SubscriptionService } from '@gitroom/nestjs-libraries/database/prisma/subscriptions/subscription.service';
import { PostsService } from '@gitroom/nestjs-libraries/database/prisma/posts/posts.service';
import { IntegrationService } from '@gitroom/nestjs-libraries/database/prisma/integrations/integration.service';
import dayjs from 'dayjs';

export enum Sections {
  CHANNEL = 'channel',
  POSTS_PER_MONTH = 'posts_per_month',
  TEAM_MEMBERS = 'team_members',
  COMMUNITY_FEATURES = 'community_features',
  FEATURED_BY_GITROOM = 'featured_by_gitroom',
  AI = 'ai',
  IMPORT_FROM_CHANNELS = 'import_from_channels',
  ADMIN = 'admin',
}

export enum AuthorizationActions {
  Create = 'create',
  Read = 'read',
  Update = 'update',
  Delete = 'delete',
}

export type AppAbility = Ability<[AuthorizationActions, Sections]>;

@Injectable()
export class PermissionsService {
  constructor(
    private _subscriptionService: SubscriptionService,
    private _postsService: PostsService,
    private _integrationService: IntegrationService
  ) {}
  async getPackageOptions(orgId: string) {
    const subscription =
      await this._subscriptionService.getSubscriptionByOrganizationId(orgId);

    const tier =
      subscription?.subscriptionTier ||
      (!process.env.STRIPE_PUBLISHABLE_KEY ? 'PRO' : 'FREE');

    const { channel, ...all } = pricing[tier];
    return {
      subscription,
      options: {
        ...all,
        ...{ channel: tier === 'FREE' ? channel : -10 },
      },
    };
  }

  async check(
    orgId: string,
    created_at: Date,
    permission: 'USER' | 'ADMIN' | 'SUPERADMIN',
    requestedPermission: Array<[AuthorizationActions, Sections]>
  ) {
    const { can, build } = new AbilityBuilder<
      Ability<[AuthorizationActions, Sections]>
    >(Ability as AbilityClass<AppAbility>);

    if (
      requestedPermission.length === 0 ||
      !process.env.STRIPE_PUBLISHABLE_KEY
    ) {
      for (const [action, section] of requestedPermission) {
        can(action, section);
      }
      return build({
        detectSubjectType: (item) =>
          // eslint-disable-next-line @typescript-eslint/ban-ts-comment
          // @ts-ignore
          item.constructor,
      });
    }

    const { subscription, options } = await this.getPackageOptions(orgId);
    for (const [action, section] of requestedPermission) {
      // check for the amount of channels
      if (section === Sections.CHANNEL) {
        const totalChannels = (
          await this._integrationService.getIntegrationsList(orgId)
        ).filter(f => !f.refreshNeeded).length;

        if (
          (options.channel && options.channel > totalChannels) ||
          (subscription?.totalChannels || 0) > totalChannels
        ) {
          can(action, section);
          continue;
        }
      }

      // check for posts per month
      if (section === Sections.POSTS_PER_MONTH) {
        const createdAt =
          (await this._subscriptionService.getSubscription(orgId))?.createdAt ||
          created_at;
        const totalMonthPast = Math.abs(
          dayjs(createdAt).diff(dayjs(), 'month')
        );
        const checkFrom = dayjs(createdAt).add(totalMonthPast, 'month');
        const count = await this._postsService.countPostsFromDay(
          orgId,
          checkFrom.toDate()
        );

        if (count < options.posts_per_month) {
          can(action, section);
          continue;
        }
      }

      if (section === Sections.TEAM_MEMBERS && options.team_members) {
        can(action, section);
        continue;
      }

      if (
        section === Sections.ADMIN &&
        ['ADMIN', 'SUPERADMIN'].includes(permission)
      ) {
        can(action, section);
        continue;
      }

      if (
        section === Sections.COMMUNITY_FEATURES &&
        options.community_features
      ) {
        can(action, section);
        continue;
      }

      if (
        section === Sections.FEATURED_BY_GITROOM &&
        options.featured_by_gitroom
      ) {
        can(action, section);
        continue;
      }

      if (section === Sections.AI && options.ai) {
        can(action, section);
        continue;
      }

      if (
        section === Sections.IMPORT_FROM_CHANNELS &&
        options.import_from_channels
      ) {
        can(action, section);
      }
    }

    return build({
      detectSubjectType: (item) =>
        // eslint-disable-next-line @typescript-eslint/ban-ts-comment
        // @ts-ignore
        item.constructor,
    });
  }
}