Endpoint para cruzar excedente e doações necessárias entre abrigos

src/supply/supply.controller.ts

@@ -1,12 +1,15 @@
 import {
   Body,
   Controller,
+  DefaultValuePipe,
   Get,
   HttpException,
   Logger,
   Param,
+  ParseIntPipe,
   Post,
   Put,
+  Query,
 } from '@nestjs/common';
 import { ApiTags } from '@nestjs/swagger';
 
@@ -52,4 +55,27 @@ export class SupplyController {
       throw new HttpException(err?.code ?? err?.name ?? `${err}`, 400);
     }
   }
+
+  @Get('surplus-demand-matches')
+  async surplus_demand_matches(
+    @Query('supplyId') supplyId: string,
+    @Query('shelterIdSurplus') shelterIdSurplus: string,
+    @Query('shelterIdNeeded') shelterIdNeeded: string,
+    @Query('perPage', new DefaultValuePipe(20), ParseIntPipe) perPage: number,
+    @Query('page', new DefaultValuePipe(1), ParseIntPipe) page: number,
+  ) {
+    try {
+      const data = await this.supplyServices.surplus_demand_matches({
+        supplyId,
+        shelterIdSurplus,
+        shelterIdNeeded,
+        perPage,
+        page
+      });
+      return new ServerResponse(200, 'Successfully got matches between surplus and demand', data);
+    } catch (err: any) {
+      this.logger.error(`Failed to get matches: ${err}`);
+      throw new HttpException(err?.code ?? err?.name ?? `${err}`, 400);
+    }
+  }
 }

src/supply/supply.service.ts

@@ -1,8 +1,9 @@
 import z from 'zod';
 import { Injectable } from '@nestjs/common';
 
+import { Prisma } from '@prisma/client';
 import { PrismaService } from '../prisma/prisma.service';
-import { CreateSupplySchema, UpdateSupplySchema } from './types';
+import { CreateSupplySchema, SurplusDemandMatch, UpdateSupplySchema } from './types';
 
 @Injectable()
 export class SupplyService {
@@ -53,4 +54,71 @@ export class SupplyService {
 
     return data;
   }
+
+  async surplus_demand_matches(body: z.infer<typeof SurplusDemandMatch>) {
+    const payload = SurplusDemandMatch.parse(body);
+    const skip = payload.perPage * (payload.page - 1);
+
+    let where: Prisma.Sql[] = [];
+
+    if (payload.supplyId) {
+      if (where.length == 0) {
+        where.push(Prisma.sql`WHERE spl.supply_id = ${payload.supplyId}`);
+      } else {
+        where.push(Prisma.sql`spl.supply_id = ${payload.supplyId}`);
+      }
+    }
+    if (payload.shelterIdSurplus) {
+      if (where.length == 0) {
+        where.push(Prisma.sql`WHERE spl.shelter_id = ${payload.shelterIdSurplus}`);
+      } else {
+        where.push(Prisma.sql`spl.shelter_id = ${payload.shelterIdSurplus}`);
+      }
+    }
+    if (payload.shelterIdNeeded) {
+      if (where.length == 0) {
+        where.push(Prisma.sql`WHERE sd.shelter_id = ${payload.shelterIdNeeded}`);
+      } else {
+        where.push(Prisma.sql`sd.shelter_id = ${payload.shelterIdNeeded}`);
+      }
+    }
+
+    const query = Prisma.sql`
+      WITH supply_surplus AS (
+        SELECT
+          ss.supply_id,
+          sp.name AS supply_name,
+          s.id AS shelter_id,
+          s.name AS shelter_name
+        FROM shelter_supplies ss
+        INNER JOIN shelters s ON s.id = ss.shelter_id
+        INNER JOIN supplies sp ON sp.id = ss.supply_id
+        WHERE ss.priority IN (1) -- 1 is 'Remaining'
+      ), supply_demand AS (
+        SELECT
+          ss.supply_id,
+          sp.name AS supply_name,
+          s.id AS shelter_id,
+          s.name AS shelter_name
+        FROM shelter_supplies ss
+        INNER JOIN shelters s ON s.id = ss.shelter_id
+        INNER JOIN supplies sp ON sp.id = ss.supply_id
+        WHERE ss.priority IN (10, 100) -- 10 & 100 are 'Needing' & 'Urgent'
+      )
+      SELECT
+        spl.supply_id,
+        spl.supply_name,
+        spl.shelter_id AS shelter_from_id,
+        spl.shelter_name AS shelter_from_name,
+        sd.shelter_id AS shelter_to_id,
+        sd.shelter_name AS shelter_to_name
+      FROM supply_surplus spl
+      INNER JOIN supply_demand sd ON sd.supply_id = spl.supply_id
+      ${where.length > 0 ? Prisma.join(where, ' AND ') : Prisma.empty}
+      ORDER BY spl.supply_name DESC, shelter_from_name DESC, shelter_to_name DESC
+      LIMIT ${payload.perPage} OFFSET ${skip}
+    `;
+
+    return await this.prismaService.$queryRaw(query);
+  }
 }

src/supply/types.ts

@@ -27,4 +27,21 @@ const UpdateSupplySchema = SupplySchema.pick({
   supplyCategoryId: true,
 }).partial();
 
-export { SupplySchema, CreateSupplySchema, UpdateSupplySchema, SupplyPriority };
+const SurplusDemandMatch = z.object({
+  supplyId: z.string().nullable().optional(),
+  shelterIdSurplus: z.string().nullable().optional(),
+  shelterIdNeeded: z.string().nullable().optional(),
+  page: z.preprocess((v) => +((v ?? '1') as string), z.number().min(1)),
+  perPage: z.preprocess(
+    (v) => +((v ?? '10') as string),
+    z.number().min(1).max(100),
+  ),
+});
+
+export {
+  SupplySchema,
+  CreateSupplySchema,
+  UpdateSupplySchema,
+  SurplusDemandMatch,
+  SupplyPriority
+};