import {
  Body,
  Controller,
  Delete,
  ForbiddenException,
  Get,
  Param,
  Patch,
  Post,
  Put,
  Req,
} from '@nestjs/common';
import { Request } from 'express';
import { DashboardService } from './dashboard.service';
import { CreateSearchProviderDto } from './dto/create-search-provider.dto';
import { CreateWidgetDto } from './dto/create-widget.dto';
import { SaveLayoutDto } from './dto/save-layout.dto';
import { UpdateWidgetConfigDto } from './dto/update-widget-config.dto';

/**
 * REST controller for dashboard layout and widget instance management.
 *
 * All endpoints require JWT auth (global JwtAuthGuard).
 * Every handler extracts userId and tenantId from the request
 * and scopes all operations to the calling user (T-05-01, T-05-02).
 *
 * Routes:
 * - GET  /dashboard/layout         — get user's saved layout
 * - PUT  /dashboard/layout         — upsert user's layout
 * - GET  /dashboard/widgets        — list user's widget instances
 * - POST /dashboard/widgets        — create a new widget instance
 * - PATCH /dashboard/widgets/:id/config — update widget config
 * - DELETE /dashboard/widgets/:id  — remove a widget instance
 * - GET  /dashboard/search-providers     — list default + user's custom providers
 * - POST /dashboard/search-providers     — create a custom search provider
 * - DELETE /dashboard/search-providers/:id — remove a custom provider
 */
@Controller('dashboard')
export class DashboardController {
  constructor(private readonly dashboardService: DashboardService) {}

  private extractContext(req: Request) {
    const userId = (req as any).user?.id;
    const tenantId =
      (req as any).tenantId ?? (req as any).user?.tenantId;

    if (!tenantId) {
      throw new ForbiddenException('No tenant context');
    }
    if (!userId) {
      throw new ForbiddenException('No user context');
    }

    return { userId, tenantId };
  }

  @Get('layout')
  async getLayout(@Req() req: Request) {
    const { userId } = this.extractContext(req);
    return this.dashboardService.getLayout(userId);
  }

  @Put('layout')
  async saveLayout(@Req() req: Request, @Body() dto: SaveLayoutDto) {
    const { userId, tenantId } = this.extractContext(req);
    return this.dashboardService.saveLayout(userId, tenantId, dto);
  }

  @Get('widgets')
  async getWidgets(@Req() req: Request) {
    const { userId } = this.extractContext(req);
    return this.dashboardService.getWidgets(userId);
  }

  @Post('widgets')
  async addWidget(@Req() req: Request, @Body() dto: CreateWidgetDto) {
    const { userId, tenantId } = this.extractContext(req);
    return this.dashboardService.addWidget(userId, tenantId, dto);
  }

  @Patch('widgets/:id/config')
  async updateWidgetConfig(
    @Param('id') id: string,
    @Req() req: Request,
    @Body() dto: UpdateWidgetConfigDto,
  ) {
    const { userId } = this.extractContext(req);
    return this.dashboardService.updateWidgetConfig(id, userId, dto);
  }

  @Delete('widgets/:id')
  async removeWidget(
    @Param('id') id: string,
    @Req() req: Request,
  ) {
    const { userId } = this.extractContext(req);
    return this.dashboardService.removeWidget(id, userId);
  }

  // --- Search Providers (05-02, D-15) ---

  @Get('search-providers')
  async getSearchProviders(@Req() req: Request) {
    const { userId } = this.extractContext(req);
    return this.dashboardService.getSearchProviders(userId);
  }

  @Post('search-providers')
  async addSearchProvider(
    @Req() req: Request,
    @Body() dto: CreateSearchProviderDto,
  ) {
    const { userId, tenantId } = this.extractContext(req);
    return this.dashboardService.addSearchProvider(userId, tenantId, dto);
  }

  @Delete('search-providers/:id')
  async removeSearchProvider(
    @Param('id') id: string,
    @Req() req: Request,
  ) {
    const { userId } = this.extractContext(req);
    return this.dashboardService.removeSearchProvider(id, userId);
  }
}