import { Injectable, NotFoundException } from '@nestjs/common';
import { TenantDatabaseService } from '../tenant/tenant-database.service';
import { App } from '../models/app.model';
import { AppPage } from '../models/app-page.model';
import { ObjectDefinition } from '../models/object-definition.model';

@Injectable()
export class AppBuilderService {
  constructor(private tenantDbService: TenantDatabaseService) {}

  // Runtime endpoints
  async getApps(tenantId: string, userId: string) {
    const knex = await this.tenantDbService.getTenantKnex(tenantId);
    // For now, return all apps
    // In production, you'd filter by user permissions
    return App.query(knex).withGraphFetched('pages').orderBy('label', 'asc');
  }

  async getApp(tenantId: string, slug: string, userId: string) {
    const knex = await this.tenantDbService.getTenantKnex(tenantId);
    const app = await App.query(knex)
      .findOne({ slug })
      .withGraphFetched('pages');

    if (!app) {
      throw new NotFoundException(`App ${slug} not found`);
    }

    return app;
  }

  async getPage(
    tenantId: string,
    appSlug: string,
    pageSlug: string,
    userId: string,
  ) {
    const knex = await this.tenantDbService.getTenantKnex(tenantId);
    const app = await this.getApp(tenantId, appSlug, userId);

    const page = await AppPage.query(knex).findOne({
      appId: app.id,
      slug: pageSlug,
    });

    if (!page) {
      throw new NotFoundException(`Page ${pageSlug} not found`);
    }

    return page;
  }

  // Setup endpoints
  async getAllApps(tenantId: string) {
    const knex = await this.tenantDbService.getTenantKnex(tenantId);
    return App.query(knex).withGraphFetched('pages').orderBy('label', 'asc');
  }

  async getAppForSetup(tenantId: string, slug: string) {
    const knex = await this.tenantDbService.getTenantKnex(tenantId);
    const app = await App.query(knex)
      .findOne({ slug })
      .withGraphFetched('pages');

    if (!app) {
      throw new NotFoundException(`App ${slug} not found`);
    }

    return app;
  }

  async createApp(
    tenantId: string,
    data: {
      slug: string;
      label: string;
      description?: string;
    },
  ) {
    const knex = await this.tenantDbService.getTenantKnex(tenantId);
    return App.query(knex).insert({
      ...data,
      displayOrder: 0,
    });
  }

  async updateApp(
    tenantId: string,
    slug: string,
    data: {
      label?: string;
      description?: string;
    },
  ) {
    const knex = await this.tenantDbService.getTenantKnex(tenantId);
    const app = await this.getAppForSetup(tenantId, slug);

    return App.query(knex).patchAndFetchById(app.id, data);
  }

  async createPage(
    tenantId: string,
    appSlug: string,
    data: {
      slug: string;
      label: string;
      type: string;
      objectApiName?: string;
      sortOrder?: number;
    },
  ) {
    const knex = await this.tenantDbService.getTenantKnex(tenantId);
    const app = await this.getAppForSetup(tenantId, appSlug);

    return AppPage.query(knex).insert({
      appId: app.id,
      slug: data.slug,
      label: data.label,
      type: data.type,
      objectApiName: data.objectApiName,
      displayOrder: data.sortOrder || 0,
    });
  }

  async updatePage(
    tenantId: string,
    appSlug: string,
    pageSlug: string,
    data: {
      label?: string;
      type?: string;
      objectApiName?: string;
      sortOrder?: number;
    },
  ) {
    const knex = await this.tenantDbService.getTenantKnex(tenantId);
    const app = await this.getAppForSetup(tenantId, appSlug);

    const page = await AppPage.query(knex).findOne({
      appId: app.id,
      slug: pageSlug,
    });

    if (!page) {
      throw new NotFoundException(`Page ${pageSlug} not found`);
    }

    return AppPage.query(knex).patchAndFetchById(page.id, {
      ...data,
      displayOrder: data.sortOrder,
    });
  }
}