add smart random

package.json

@@ -34,7 +34,7 @@
     "@nestjs/platform-fastify": "^9.4.1",
     "@nestjs/schedule": "^2.2.3",
     "@nestjs/swagger": "^6.3.0",
-    "@prisma/client": "^4.15.0",
+    "@prisma/client": "^5.0.0",
     "bcrypt": "^5.1.0",
     "class-transformer": "0.3.1",
     "class-validator": "^0.14.0",
@@ -66,7 +66,7 @@
     "eslint-plugin-prettier": "^4.2.1",
     "jest": "29.5.0",
     "prettier": "^2.8.8",
-    "prisma": "^4.15.0",
+    "prisma": "^5.0.0",
     "source-map-support": "^0.5.21",
     "supertest": "^6.3.3",
     "ts-jest": "29.1.0",

pnpm-lock.yaml

@@ -45,8 +45,8 @@ dependencies:
     specifier: ^6.3.0
     version: 6.3.0(@nestjs/common@9.4.1)(@nestjs/core@9.4.1)(class-transformer@0.3.1)(class-validator@0.14.0)(reflect-metadata@0.1.13)
   '@prisma/client':
-    specifier: ^4.15.0
-    version: 4.15.0(prisma@4.15.0)
+    specifier: ^5.0.0
+    version: 5.0.0(prisma@5.0.0)
   bcrypt:
     specifier: ^5.1.0
     version: 5.1.0
@@ -137,8 +137,8 @@ devDependencies:
     specifier: ^2.8.8
     version: 2.8.8
   prisma:
-    specifier: ^4.15.0
-    version: 4.15.0
+    specifier: ^5.0.0
+    version: 5.0.0
   source-map-support:
     specifier: ^0.5.21
     version: 0.5.21
@@ -150,7 +150,7 @@ devDependencies:
     version: 29.1.0(@babel/core@7.22.5)(jest@29.5.0)(typescript@5.0.4)
   ts-loader:
     specifier: ^9.4.2
-    version: 9.4.2(typescript@5.0.4)(webpack@5.86.0)
+    version: 9.4.2(typescript@5.0.4)(webpack@5.88.1)
   ts-node:
     specifier: ^10.9.1
     version: 10.9.1(@types/node@18.16.12)(typescript@5.0.4)
@@ -2073,9 +2073,9 @@ packages:
     transitivePeerDependencies:
       - encoding
 
-  /@prisma/client@4.15.0(prisma@4.15.0):
-    resolution: {integrity: sha512-xnROvyABcGiwqRNdrObHVZkD9EjkJYHOmVdlKy1yGgI+XOzvMzJ4tRg3dz1pUlsyhKxXGCnjIQjWW+2ur+YXuw==}
-    engines: {node: '>=14.17'}
+  /@prisma/client@5.0.0(prisma@5.0.0):
+    resolution: {integrity: sha512-XlO5ELNAQ7rV4cXIDJUNBEgdLwX3pjtt9Q/RHqDpGf43szpNJx2hJnggfFs7TKNx0cOFsl6KJCSfqr5duEU/bQ==}
+    engines: {node: '>=16.13'}
     requiresBuild: true
     peerDependencies:
       prisma: '*'
@@ -2083,16 +2083,16 @@ packages:
       prisma:
         optional: true
     dependencies:
-      '@prisma/engines-version': 4.15.0-28.8fbc245156db7124f997f4cecdd8d1219e360944
-      prisma: 4.15.0
+      '@prisma/engines-version': 4.17.0-26.6b0aef69b7cdfc787f822ecd7cdc76d5f1991584
+      prisma: 5.0.0
     dev: false
 
-  /@prisma/engines-version@4.15.0-28.8fbc245156db7124f997f4cecdd8d1219e360944:
-    resolution: {integrity: sha512-sVOig4tjGxxlYaFcXgE71f/rtFhzyYrfyfNFUsxCIEJyVKU9rdOWIlIwQ2NQ7PntvGnn+x0XuFo4OC1jvPJKzg==}
+  /@prisma/engines-version@4.17.0-26.6b0aef69b7cdfc787f822ecd7cdc76d5f1991584:
+    resolution: {integrity: sha512-HHiUF6NixsldsP3JROq07TYBLEjXFKr6PdH8H4gK/XAoTmIplOJBCgrIUMrsRAnEuGyRoRLXKXWUb943+PFoKQ==}
     dev: false
 
-  /@prisma/engines@4.15.0:
-    resolution: {integrity: sha512-FTaOCGs0LL0OW68juZlGxFtYviZa4xdQj/rQEdat2txw0s3Vu/saAPKjNVXfIgUsGXmQ72HPgNr6935/P8FNAA==}
+  /@prisma/engines@5.0.0:
+    resolution: {integrity: sha512-kyT/8fd0OpWmhAU5YnY7eP31brW1q1YrTGoblWrhQJDiN/1K+Z8S1kylcmtjqx5wsUGcP1HBWutayA/jtyt+sg==}
     requiresBuild: true
 
   /@selderee/plugin-htmlparser2@0.10.0:
@@ -2621,6 +2621,14 @@ packages:
       mime-types: 2.1.35
       negotiator: 0.6.3
 
+  /acorn-import-assertions@1.9.0(acorn@8.10.0):
+    resolution: {integrity: sha512-cmMwop9x+8KFhxvKrKfPYmN6/pKTYYHBqLa0DfvVZcKMJWNyWLnaqND7dx/qn66R7ewM1UX5XMaDVP5wlVTaVA==}
+    peerDependencies:
+      acorn: ^8
+    dependencies:
+      acorn: 8.10.0
+    dev: true
+
   /acorn-import-assertions@1.9.0(acorn@8.8.2):
     resolution: {integrity: sha512-cmMwop9x+8KFhxvKrKfPYmN6/pKTYYHBqLa0DfvVZcKMJWNyWLnaqND7dx/qn66R7ewM1UX5XMaDVP5wlVTaVA==}
     peerDependencies:
@@ -2647,6 +2655,12 @@ packages:
     hasBin: true
     dev: false
 
+  /acorn@8.10.0:
+    resolution: {integrity: sha512-F0SAmZ8iUtS//m8DmCTA0jlh6TDKkHQyK6xc6V4KDTyZKA9dnvX9/3sRTVQrWm79glUAZbnmmNcdYwUIHWVybw==}
+    engines: {node: '>=0.4.0'}
+    hasBin: true
+    dev: true
+
   /acorn@8.8.2:
     resolution: {integrity: sha512-xjIYgE8HBrkpd/sJqOGNspf8uHG+NOHGOw6a/Urj8taM2EXfdNAH2oFcPeIFfsv3+kz/mJrS5VuMqbNLjCa2vw==}
     engines: {node: '>=0.4.0'}
@@ -3000,6 +3014,17 @@ packages:
       update-browserslist-db: 1.0.11(browserslist@4.21.7)
     dev: true
 
+  /browserslist@4.21.9:
+    resolution: {integrity: sha512-M0MFoZzbUrRU4KNfCrDLnvyE7gub+peetoTid3TBIqtunaDJyXlwhakT+/VkvSXcfIzFfK/nkCs4nmyTmxdNSg==}
+    engines: {node: ^6 || ^7 || ^8 || ^9 || ^10 || ^11 || ^12 || >=13.7}
+    hasBin: true
+    dependencies:
+      caniuse-lite: 1.0.30001515
+      electron-to-chromium: 1.4.457
+      node-releases: 2.0.13
+      update-browserslist-db: 1.0.11(browserslist@4.21.9)
+    dev: true
+
   /bs-logger@0.2.6:
     resolution: {integrity: sha512-pd8DCoxmbgc7hyPKOvxtqNcjYoOsABPQdcCUjGp3d42VR2CX1ORhk2A87oqqu5R1kk+76nsxZupkmyd+MVtCog==}
     engines: {node: '>= 6'}
@@ -3076,6 +3101,10 @@ packages:
     resolution: {integrity: sha512-AZ+9tFXw1sS0o0jcpJQIXvFTOB/xGiQ4OQ2t98QX3NDn2EZTSRBC801gxrsGgViuq2ak/NLkNgSNEPtCr5lfKg==}
     dev: true
 
+  /caniuse-lite@1.0.30001515:
+    resolution: {integrity: sha512-eEFDwUOZbE24sb+Ecsx3+OvNETqjWIdabMy52oOkIgcUtAsQifjUG9q4U9dgTHJM2mfk4uEPxc0+xuFdJ629QA==}
+    dev: true
+
   /chalk@2.4.2:
     resolution: {integrity: sha512-Mti+f9lpJNcwF4tWV8/OrTTtF1gZi+f8FqlyAdouralcFWFQWF2+NgCHShjkCb+IFBLq9buZwE1xckQU4peSuQ==}
     engines: {node: '>=4'}
@@ -3654,6 +3683,10 @@ packages:
     resolution: {integrity: sha512-HK3r9l+Jm8dYAm1ctXEWIC+hV60zfcjS9UA5BDlYvnI5S7PU/yytjpvSrTNrSSRRkuu3tDyZhdkwIczh+0DWaw==}
     dev: true
 
+  /electron-to-chromium@1.4.457:
+    resolution: {integrity: sha512-/g3UyNDmDd6ebeWapmAoiyy+Sy2HyJ+/X8KyvNeHfKRFfHaA2W8oF5fxD5F3tjBDcjpwo0iek6YNgxNXDBoEtA==}
+    dev: true
+
   /emittery@0.13.1:
     resolution: {integrity: sha512-DeWwawk6r5yR9jFgnDKYt4sLS0LmHJJi3ZOnb5/JdbYwj3nW+FxQnHIjhBKz8YLC7oRNPVM9NQ47I3CVx34eqQ==}
     engines: {node: '>=12'}
@@ -3685,6 +3718,14 @@ packages:
       tapable: 2.2.1
     dev: true
 
+  /enhanced-resolve@5.15.0:
+    resolution: {integrity: sha512-LXYT42KJ7lpIKECr2mAXIaMldcNCh/7E0KBKOu4KSfkHmP+mZmSs+8V5gBAqisWBy0OO4W5Oyys0GO1Y8KtdKg==}
+    engines: {node: '>=10.13.0'}
+    dependencies:
+      graceful-fs: 4.2.11
+      tapable: 2.2.1
+    dev: true
+
   /entities@2.2.0:
     resolution: {integrity: sha512-p92if5Nz619I0w+akJrLZH0MX0Pb5DX39XOwQTtXSdQQOaYH03S1uIQp4mhOZtAXrxq4ViO67YTiLBo2638o9A==}
     dev: false
@@ -6225,6 +6266,10 @@ packages:
     resolution: {integrity: sha512-QzsYKWhXTWx8h1kIvqfnC++o0pEmpRQA/aenALsL2F4pqNVr7YzcdMlDij5WBnwftRbJCNJL/O7zdKaxKPHqgQ==}
     dev: true
 
+  /node-releases@2.0.13:
+    resolution: {integrity: sha512-uYr7J37ae/ORWdZeQ1xxMJe3NtdmqMC/JZK+geofDrkLUApKRHPd18/TxtBOJ4A0/+uUIliorNrfYV6s1b02eQ==}
+    dev: true
+
   /nodemailer@6.9.1:
     resolution: {integrity: sha512-qHw7dOiU5UKNnQpXktdgQ1d3OFgRAekuvbJLcdG5dnEo/GtcTHRYM7+UfJARdOFU9WUQO8OiIamgWPmiSFHYAA==}
     engines: {node: '>=6.0.0'}
@@ -6659,13 +6704,13 @@ packages:
       - supports-color
     dev: false
 
-  /prisma@4.15.0:
-    resolution: {integrity: sha512-iKZZpobPl48gTcSZVawLMQ3lEy6BnXwtoMj7hluoGFYu2kQ6F9LBuBrUyF95zRVnNo8/3KzLXJXJ5TEnLSJFiA==}
-    engines: {node: '>=14.17'}
+  /prisma@5.0.0:
+    resolution: {integrity: sha512-KYWk83Fhi1FH59jSpavAYTt2eoMVW9YKgu8ci0kuUnt6Dup5Qy47pcB4/TLmiPAbhGrxxSz7gsSnJcCmkyPANA==}
+    engines: {node: '>=16.13'}
     hasBin: true
     requiresBuild: true
     dependencies:
-      '@prisma/engines': 4.15.0
+      '@prisma/engines': 5.0.0
 
   /process-nextick-args@2.0.1:
     resolution: {integrity: sha512-3ouUOpQhtgrbOa17J7+uxOTpITYWaGP7/AhoR3+A+/1e9skrzelGi/dXzEYyvbxubEF6Wn2ypscTKiKJFFn1ag==}
@@ -7086,6 +7131,15 @@ packages:
       ajv-keywords: 3.5.2(ajv@6.12.6)
     dev: true
 
+  /schema-utils@3.3.0:
+    resolution: {integrity: sha512-pN/yOAvcC+5rQ5nERGuwrjLlYvLTbCibnZ1I7B1LaiAz9BRBlE9GMgE/eqV30P7aJQUf7Ddimy/RsbYO/GrVGg==}
+    engines: {node: '>= 10.13.0'}
+    dependencies:
+      '@types/json-schema': 7.0.12
+      ajv: 6.12.6
+      ajv-keywords: 3.5.2(ajv@6.12.6)
+    dev: true
+
   /secure-json-parse@2.7.0:
     resolution: {integrity: sha512-6aU+Rwsezw7VR8/nyvKTx8QpWH9FrcYiXXlqC4z5d5XQBDRqtbfsRjnwGyqbi3gddNtWHuEk9OANUotL26qKUw==}
     dev: false
@@ -7473,7 +7527,7 @@ packages:
       webpack: 5.82.1
     dev: true
 
-  /terser-webpack-plugin@5.3.9(webpack@5.86.0):
+  /terser-webpack-plugin@5.3.9(webpack@5.88.1):
     resolution: {integrity: sha512-ZuXsqE07EcggTWQjXUj+Aot/OMcD0bMKGgF63f7UxYcu5/AJF53aIpK1YoP5xR9l6s/Hy2b+t1AM0bLNPRuhwA==}
     engines: {node: '>= 10.13.0'}
     peerDependencies:
@@ -7494,7 +7548,7 @@ packages:
       schema-utils: 3.2.0
       serialize-javascript: 6.0.1
       terser: 5.18.0
-      webpack: 5.86.0
+      webpack: 5.88.1
     dev: true
 
   /terser@5.18.0:
@@ -7612,7 +7666,7 @@ packages:
       yargs-parser: 21.1.1
     dev: true
 
-  /ts-loader@9.4.2(typescript@5.0.4)(webpack@5.86.0):
+  /ts-loader@9.4.2(typescript@5.0.4)(webpack@5.88.1):
     resolution: {integrity: sha512-OmlC4WVmFv5I0PpaxYb+qGeGOdm5giHU7HwDDUjw59emP2UYMHy9fFSDcYgSNoH8sXcj4hGCSEhlDZ9ULeDraA==}
     engines: {node: '>=12.0.0'}
     peerDependencies:
@@ -7624,7 +7678,7 @@ packages:
       micromatch: 4.0.5
       semver: 7.5.1
       typescript: 5.0.4
-      webpack: 5.86.0
+      webpack: 5.88.1
     dev: true
 
   /ts-node@10.9.1(@types/node@18.16.12)(typescript@5.0.4):
@@ -7787,6 +7841,17 @@ packages:
       picocolors: 1.0.0
     dev: true
 
+  /update-browserslist-db@1.0.11(browserslist@4.21.9):
+    resolution: {integrity: sha512-dCwEFf0/oT85M1fHBg4F0jtLwJrutGoHSQXCh7u4o2t1drG+c0a9Flnqww6XUKSfQMPpJBRjU8d4RXB09qtvaA==}
+    hasBin: true
+    peerDependencies:
+      browserslist: '>= 4.21.0'
+    dependencies:
+      browserslist: 4.21.9
+      escalade: 3.1.1
+      picocolors: 1.0.0
+    dev: true
+
   /upper-case@1.1.3:
     resolution: {integrity: sha512-WRbjgmYzgXkCV7zNVpy5YgrHgbBv126rMALQQMrmzOVC4GM2waQ9x7xtm8VU+1yF2kWyPzI9zbZ48n4vSxwfSA==}
     dev: false
@@ -7940,8 +8005,8 @@ packages:
       - uglify-js
     dev: true
 
-  /webpack@5.86.0:
-    resolution: {integrity: sha512-3BOvworZ8SO/D4GVP+GoRC3fVeg5MO4vzmq8TJJEkdmopxyazGDxN8ClqN12uzrZW9Tv8EED8v5VSb6Sqyi0pg==}
+  /webpack@5.88.1:
+    resolution: {integrity: sha512-FROX3TxQnC/ox4N+3xQoWZzvGXSuscxR32rbzjpXgEzWudJFEJBpdlkkob2ylrv5yzzufD1zph1OoFsLtm6stQ==}
     engines: {node: '>=10.13.0'}
     hasBin: true
     peerDependencies:
@@ -7955,11 +8020,11 @@ packages:
       '@webassemblyjs/ast': 1.11.6
       '@webassemblyjs/wasm-edit': 1.11.6
       '@webassemblyjs/wasm-parser': 1.11.6
-      acorn: 8.8.2
-      acorn-import-assertions: 1.9.0(acorn@8.8.2)
-      browserslist: 4.21.7
+      acorn: 8.10.0
+      acorn-import-assertions: 1.9.0(acorn@8.10.0)
+      browserslist: 4.21.9
       chrome-trace-event: 1.0.3
-      enhanced-resolve: 5.14.1
+      enhanced-resolve: 5.15.0
       es-module-lexer: 1.3.0
       eslint-scope: 5.1.1
       events: 3.3.0
@@ -7969,9 +8034,9 @@ packages:
       loader-runner: 4.3.0
       mime-types: 2.1.35
       neo-async: 2.6.2
-      schema-utils: 3.2.0
+      schema-utils: 3.3.0
       tapable: 2.2.1
-      terser-webpack-plugin: 5.3.9(webpack@5.86.0)
+      terser-webpack-plugin: 5.3.9(webpack@5.88.1)
       watchpack: 2.4.0
       webpack-sources: 3.2.3
     transitivePeerDependencies:

prisma/schema.prisma

@@ -84,7 +84,6 @@ model card {
   userId        String
   question      String   @db.Text
   answer        String   @db.Text
-  grade         Int      @default(0)
   shots         Int      @default(0)
   questionImg   String?
   answerImg     String?
@@ -116,27 +115,26 @@ model deck {
   isBlocked  Boolean?
   created    DateTime @default(now())
   updated    DateTime @updatedAt
-  author     user     @relation(fields: [userId], references: [id])
   cardsCount Int      @default(0)
+  author     user     @relation(fields: [userId], references: [id])
   card       card[]
-  grade      grade[]
+  grades     grade[]
 
   @@index([userId])
 }
 
 model grade {
   id      String   @id @default(cuid())
-  deckId  String
-  cardId  String
-  userId  String
+  deckId  String   @unique
+  cardId  String   @unique
+  userId  String   @unique
   grade   Int
   shots   Int
-  moreId  String?
   created DateTime @default(now())
   updated DateTime @updatedAt
   user    user     @relation(fields: [userId], references: [id])
   card    card     @relation(fields: [cardId], references: [id])
-  decks   deck     @relation(fields: [deckId], references: [id])
+  deck    deck     @relation(fields: [deckId], references: [id])
 
   @@index([userId])
   @@index([deckId])

src/infrastructure/common/helpers/get-order-by-object.ts

@@ -0,0 +1,30 @@
+type OrderByDirection = 'asc' | 'desc'
+
+export function createPrismaOrderBy(input: string | null) {
+  if (!input || input === 'null') {
+    return undefined
+  }
+  const [key, direction] = input.split('-')
+
+  if (!key || !direction) {
+    throw new Error("Invalid format. Expected format is 'key-direction'")
+  }
+
+  if (direction !== 'asc' && direction !== 'desc') {
+    throw new Error("Invalid direction. Expected 'asc' or 'desc'")
+  }
+
+  if (key.includes('.')) {
+    const [relation, field] = key.split('.')
+
+    return {
+      [relation]: {
+        [field]: direction,
+      },
+    }
+  }
+
+  return {
+    [key]: direction as OrderByDirection,
+  }
+}

src/infrastructure/decorators/is-order-by-constraint.ts

@@ -0,0 +1,45 @@
+import {
+  registerDecorator,
+  ValidationArguments,
+  ValidationOptions,
+  ValidatorConstraint,
+  ValidatorConstraintInterface,
+} from 'class-validator'
+
+@ValidatorConstraint({ async: false })
+export class IsOrderByConstraint implements ValidatorConstraintInterface {
+  validate(orderBy: string | null, args: ValidationArguments) {
+    console.log(orderBy)
+    if (!orderBy || orderBy === 'null' || orderBy === '') {
+      return true
+    }
+    const [key, direction] = orderBy.split('-')
+
+    if (!key || !direction) {
+      return false
+    }
+
+    if (direction !== 'asc' && direction !== 'desc') {
+      return false
+    }
+
+    return true
+  }
+
+  defaultMessage(args: ValidationArguments) {
+    return 'Invalid format. Expected format is "key-direction". Direction must be "asc" or "desc".'
+  }
+}
+
+export function IsOrderBy(validationOptions?: ValidationOptions) {
+  // eslint-disable-next-line @typescript-eslint/ban-types
+  return function (object: { constructor: Function }, propertyName: string) {
+    registerDecorator({
+      target: object.constructor,
+      propertyName: propertyName,
+      options: validationOptions,
+      constraints: [],
+      validator: IsOrderByConstraint,
+    })
+  }
+}

src/modules/auth/use-cases/get-current-user-data-use-case.ts

@@ -17,6 +17,6 @@ export class GetCurrentUserDataHandler implements ICommandHandler<GetCurrentUser
 
     if (!user) throw new UnauthorizedException()
 
-    return pick(user, ['email', 'name', 'id', 'isEmailVerified'])
+    return pick(user, ['email', 'name', 'id', 'isEmailVerified', 'avatar'])
   }
 }

src/modules/cards/cards.controller.ts

@@ -2,7 +2,7 @@ import { Body, Controller, Delete, Get, Param, Patch, Req, UseGuards } from '@ne
 import { CardsService } from './cards.service'
 import { UpdateCardDto } from './dto/update-card.dto'
 import { CommandBus } from '@nestjs/cqrs'
-import { DeleteDeckByIdCommand, GetDeckByIdCommand, UpdateDeckCommand } from './use-cases'
+import { DeleteCardByIdCommand, GetDeckByIdCommand, UpdateDeckCommand } from './use-cases'
 import { JwtAuthGuard } from '../auth/guards/jwt-auth.guard'
 
 @Controller('cards')
@@ -24,6 +24,6 @@ export class CardsController {
   @UseGuards(JwtAuthGuard)
   @Delete(':id')
   remove(@Param('id') id: string, @Req() req) {
-    return this.commandBus.execute(new DeleteDeckByIdCommand(id, req.user.id))
+    return this.commandBus.execute(new DeleteCardByIdCommand(id, req.user.id))
   }
 }

src/modules/cards/cards.module.ts

@@ -2,10 +2,10 @@ import { Module } from '@nestjs/common'
 import { CardsService } from './cards.service'
 import { CardsController } from './cards.controller'
 import { CqrsModule } from '@nestjs/cqrs'
-import { DeleteDeckByIdHandler, GetDeckByIdHandler, UpdateDeckHandler } from './use-cases'
+import { DeleteCardByIdHandler, GetDeckByIdHandler, UpdateDeckHandler } from './use-cases'
 import { CardsRepository } from './infrastructure/cards.repository'
 
-const commandHandlers = [GetDeckByIdHandler, DeleteDeckByIdHandler, UpdateDeckHandler]
+const commandHandlers = [GetDeckByIdHandler, DeleteCardByIdHandler, UpdateDeckHandler]
 
 @Module({
   imports: [CqrsModule],

src/modules/cards/dto/get-all-cards.dto.ts

@@ -1,6 +1,7 @@
 import { Length } from 'class-validator'
 import { PaginationDto } from '../../../infrastructure/common/pagination/pagination.dto'
 import { IsOptionalOrEmptyString } from '../../../infrastructure/decorators/is-optional-or-empty-string'
+import { IsOrderBy } from '../../../infrastructure/decorators/is-order-by-constraint'
 
 export class GetAllCardsInDeckDto extends PaginationDto {
   @IsOptionalOrEmptyString()
@@ -10,4 +11,7 @@ export class GetAllCardsInDeckDto extends PaginationDto {
   @IsOptionalOrEmptyString()
   @Length(1, 30)
   answer?: string
+
+  @IsOrderBy()
+  orderBy?: string | null
 }

src/modules/cards/infrastructure/cards.repository.ts

@@ -2,6 +2,8 @@ import { Injectable, InternalServerErrorException, Logger } from '@nestjs/common
 import { PrismaService } from '../../../prisma.service'
 import { GetAllCardsInDeckDto } from '../dto/get-all-cards.dto'
 import { CreateCardDto } from '../dto/create-card.dto'
+import { Pagination } from '../../../infrastructure/common/pagination/pagination.service'
+import { createPrismaOrderBy } from '../../../infrastructure/common/helpers/get-order-by-object'
 
 @Injectable()
 export class CardsRepository {
@@ -48,23 +50,56 @@ export class CardsRepository {
 
   async findCardsByDeckId(
     deckId: string,
-    { answer = undefined, question = undefined, currentPage, itemsPerPage }: GetAllCardsInDeckDto
+    {
+      answer = undefined,
+      question = undefined,
+      currentPage,
+      itemsPerPage,
+      orderBy,
+    }: GetAllCardsInDeckDto
   ) {
     try {
-      return await this.prisma.card.findMany({
+      const where = {
+        decks: {
+          id: deckId,
+        },
+        question: {
+          contains: question || undefined,
+        },
+        answer: {
+          contains: answer || undefined,
+        },
+      }
+      const result = await this.prisma.$transaction([
+        this.prisma.card.count({ where }),
+        this.prisma.card.findMany({
+          orderBy: createPrismaOrderBy(orderBy) || { updated: 'desc' },
+          where,
+          skip: (currentPage - 1) * itemsPerPage,
+          take: itemsPerPage,
+        }),
+      ])
+      return Pagination.transformPaginationData(result, { currentPage, itemsPerPage })
+    } catch (e) {
+      this.logger.error(e?.message)
+      throw new InternalServerErrorException(e?.message)
+    }
+  }
+
+  async findCardsByDeckIdWithGrade(userId: string, deckId: string) {
+    try {
+      return this.prisma.card.findMany({
         where: {
-          decks: {
-            id: deckId,
-          },
-          question: {
-            contains: question || undefined,
-          },
-          answer: {
-            contains: answer || undefined,
+          deckId,
+        },
+        include: {
+          grades: {
+            where: {
+              userId,
+              deckId,
+            },
           },
         },
-        skip: (currentPage - 1) * itemsPerPage,
-        take: itemsPerPage,
       })
     } catch (e) {
       this.logger.error(e?.message)
@@ -72,9 +107,9 @@ export class CardsRepository {
     }
   }
 
-  public async findDeckById(id: string) {
+  public async findCardById(id: string) {
     try {
-      return await this.prisma.deck.findUnique({
+      return await this.prisma.card.findUnique({
         where: {
           id,
         },
@@ -85,12 +120,25 @@ export class CardsRepository {
     }
   }
 
-  public async deleteDeckById(id: string) {
+  public async deleteCardById(id: string) {
     try {
-      return await this.prisma.deck.delete({
-        where: {
-          id,
-        },
+      return await this.prisma.$transaction(async tx => {
+        const deleted = await tx.card.delete({
+          where: {
+            id,
+          },
+        })
+        await tx.deck.update({
+          where: {
+            id: deleted.deckId,
+          },
+          data: {
+            cardsCount: {
+              decrement: 1,
+            },
+          },
+        })
+        return deleted
       })
     } catch (e) {
       this.logger.error(e?.message)

src/modules/cards/use-cases/delete-card-by-id-use-case.ts

@@ -0,0 +1,21 @@
+import { CommandHandler, ICommandHandler } from '@nestjs/cqrs'
+import { CardsRepository } from '../infrastructure/cards.repository'
+import { BadRequestException, NotFoundException } from '@nestjs/common'
+
+export class DeleteCardByIdCommand {
+  constructor(public readonly id: string, public readonly userId: string) {}
+}
+
+@CommandHandler(DeleteCardByIdCommand)
+export class DeleteCardByIdHandler implements ICommandHandler<DeleteCardByIdCommand> {
+  constructor(private readonly cardsRepository: CardsRepository) {}
+
+  async execute(command: DeleteCardByIdCommand) {
+    const card = await this.cardsRepository.findCardById(command.id)
+    if (!card) throw new NotFoundException(`Card with id ${command.id} not found`)
+    if (card.userId !== command.userId) {
+      throw new BadRequestException(`You can't delete a card that you don't own`)
+    }
+    return await this.cardsRepository.deleteCardById(command.id)
+  }
+}

src/modules/cards/use-cases/delete-deck-by-id-use-case.ts

@@ -1,21 +0,0 @@
-import { CommandHandler, ICommandHandler } from '@nestjs/cqrs'
-import { CardsRepository } from '../infrastructure/cards.repository'
-import { BadRequestException, NotFoundException } from '@nestjs/common'
-
-export class DeleteDeckByIdCommand {
-  constructor(public readonly id: string, public readonly userId: string) {}
-}
-
-@CommandHandler(DeleteDeckByIdCommand)
-export class DeleteDeckByIdHandler implements ICommandHandler<DeleteDeckByIdCommand> {
-  constructor(private readonly deckRepository: CardsRepository) {}
-
-  async execute(command: DeleteDeckByIdCommand) {
-    const deck = await this.deckRepository.findDeckById(command.id)
-    if (!deck) throw new NotFoundException(`Deck with id ${command.id} not found`)
-    if (deck.userId !== command.userId) {
-      throw new BadRequestException(`You can't delete a deck that you don't own`)
-    }
-    return await this.deckRepository.deleteDeckById(command.id)
-  }
-}

src/modules/cards/use-cases/get-deck-by-id-use-case.ts

@@ -10,6 +10,6 @@ export class GetDeckByIdHandler implements ICommandHandler<GetDeckByIdCommand> {
   constructor(private readonly deckRepository: CardsRepository) {}
 
   async execute(command: GetDeckByIdCommand) {
-    return await this.deckRepository.findDeckById(command.id)
+    return await this.deckRepository.findCardById(command.id)
   }
 }

src/modules/cards/use-cases/index.ts

@@ -1,3 +1,3 @@
 export * from './get-deck-by-id-use-case'
-export * from './delete-deck-by-id-use-case'
+export * from './delete-card-by-id-use-case'
 export * from './update-deck-use-case'

src/modules/cards/use-cases/update-deck-use-case.ts

@@ -16,7 +16,7 @@ export class UpdateDeckHandler implements ICommandHandler<UpdateDeckCommand> {
   constructor(private readonly deckRepository: CardsRepository) {}
 
   async execute(command: UpdateDeckCommand) {
-    const deck = await this.deckRepository.findDeckById(command.deckId)
+    const deck = await this.deckRepository.findCardById(command.deckId)
 
     if (!deck) throw new NotFoundException(`Deck with id ${command.deckId} not found`)
 

src/modules/decks/decks.controller.ts

@@ -22,13 +22,15 @@ import {
   GetAllDecksCommand,
   GetDeckByIdCommand,
   UpdateDeckCommand,
+  CreateCardCommand,
 } from './use-cases'
 import { JwtAuthGuard } from '../auth/guards/jwt-auth.guard'
 import { GetAllDecksDto } from './dto/get-all-decks.dto'
 import { GetAllCardsInDeckDto } from '../cards/dto/get-all-cards.dto'
-import { CreateCardCommand } from './use-cases'
 import { CreateCardDto } from '../cards/dto/create-card.dto'
 import { Pagination } from '../../infrastructure/common/pagination/pagination.service'
+import { GetRandomCardInDeckCommand } from './use-cases/get-random-card-in-deck-use-case'
+import { SaveGradeCommand } from './use-cases/save-grade-use-case'
 
 @Controller('decks')
 export class DecksController {
@@ -57,9 +59,21 @@ export class DecksController {
   @UseGuards(JwtAuthGuard)
   @Get(':id/cards')
   findCardsInDeck(@Param('id') id: string, @Req() req, @Query() query: GetAllCardsInDeckDto) {
-    return this.commandBus.execute(new GetAllCardsInDeckCommand(req.user.id, id, query))
+    const finalQuery = Pagination.getPaginationData(query)
+    return this.commandBus.execute(new GetAllCardsInDeckCommand(req.user.id, id, finalQuery))
+  }
+  @UseGuards(JwtAuthGuard)
+  @Get(':id/learn')
+  findRandomCardInDeck(@Param('id') id: string, @Req() req) {
+    return this.commandBus.execute(new GetRandomCardInDeckCommand(req.user.id, id))
+  }
+  @UseGuards(JwtAuthGuard)
+  @Post(':id/learn')
+  saveGrade(@Param('id') id: string, @Req() req, @Body() body: any) {
+    return this.commandBus.execute(
+      new SaveGradeCommand(req.user.id, { cardId: body.cardId, grade: body.grade })
+    )
   }
-
   @UseGuards(JwtAuthGuard)
   @Post(':id/cards')
   createCardInDeck(@Param('id') id: string, @Req() req, @Body() card: CreateCardDto) {

src/modules/decks/decks.module.ts

@@ -13,21 +13,26 @@ import {
 } from './use-cases'
 import { DecksRepository } from './infrastructure/decks.repository'
 import { CardsRepository } from '../cards/infrastructure/cards.repository'
+import { GetRandomCardInDeckHandler } from './use-cases/get-random-card-in-deck-use-case'
+import { GradesRepository } from './infrastructure/grades.repository'
+import { SaveGradeHandler } from './use-cases/save-grade-use-case'
 
 const commandHandlers = [
   CreateDeckHandler,
   GetAllDecksHandler,
   GetDeckByIdHandler,
+  GetRandomCardInDeckHandler,
   DeleteDeckByIdHandler,
   UpdateDeckHandler,
   GetAllCardsInDeckHandler,
   CreateCardHandler,
+  SaveGradeHandler,
 ]
 
 @Module({
   imports: [CqrsModule],
   controllers: [DecksController],
-  providers: [DecksService, DecksRepository, CardsRepository, ...commandHandlers],
+  providers: [DecksService, DecksRepository, CardsRepository, GradesRepository, ...commandHandlers],
   exports: [CqrsModule],
 })
 export class DecksModule {}

src/modules/decks/dto/create-grade.dto.ts

@@ -0,0 +1,10 @@
+import { IsUUID, Max, Min } from 'class-validator'
+
+export class CreateDeckDto {
+  @Min(1)
+  @Max(5)
+  grade: number
+
+  @IsUUID()
+  cardId: string
+}

src/modules/decks/dto/get-all-decks.dto.ts

@@ -1,6 +1,7 @@
 import { IsUUID } from 'class-validator'
 import { IsOptionalOrEmptyString } from '../../../infrastructure/decorators/is-optional-or-empty-string'
 import { PaginationDto } from '../../../infrastructure/common/pagination/pagination.dto'
+import { IsOrderBy } from '../../../infrastructure/decorators/is-order-by-constraint'
 
 export class GetAllDecksDto extends PaginationDto {
   @IsOptionalOrEmptyString()
@@ -17,4 +18,7 @@ export class GetAllDecksDto extends PaginationDto {
   authorId?: string
 
   userId: string
+
+  @IsOrderBy()
+  orderBy?: string | null
 }

src/modules/decks/infrastructure/decks.repository.ts

@@ -2,6 +2,7 @@ import { Injectable, InternalServerErrorException, Logger } from '@nestjs/common
 import { PrismaService } from '../../../prisma.service'
 import { GetAllDecksDto } from '../dto/get-all-decks.dto'
 import { Pagination } from '../../../infrastructure/common/pagination/pagination.service'
+import { createPrismaOrderBy } from '../../../infrastructure/common/helpers/get-order-by-object'
 
 @Injectable()
 export class DecksRepository {
@@ -48,13 +49,15 @@ export class DecksRepository {
     itemsPerPage,
     minCardsCount,
     maxCardsCount,
+    orderBy,
   }: GetAllDecksDto) {
-    console.log({ name, authorId, userId, currentPage, itemsPerPage, minCardsCount, maxCardsCount })
+    console.log(minCardsCount)
+    console.log(Number(minCardsCount))
     try {
       const where = {
         cardsCount: {
-          gte: Number(minCardsCount) ?? undefined,
-          lte: Number(maxCardsCount) ?? undefined,
+          gte: minCardsCount ? Number(minCardsCount) : undefined,
+          lte: maxCardsCount ? Number(maxCardsCount) : undefined,
         },
         name: {
           contains: name,
@@ -85,9 +88,7 @@ export class DecksRepository {
         }),
         this.prisma.deck.findMany({
           where,
-          orderBy: {
-            created: 'desc',
-          },
+          orderBy: createPrismaOrderBy(orderBy),
           include: {
             author: {
               select: {
@@ -124,6 +125,24 @@ export class DecksRepository {
       throw new InternalServerErrorException(e?.message)
     }
   }
+  public async findDeckByCardId(cardId: string) {
+    try {
+      const card = await this.prisma.card.findUnique({
+        where: {
+          id: cardId,
+        },
+      })
+
+      return await this.prisma.deck.findUnique({
+        where: {
+          id: card.deckId,
+        },
+      })
+    } catch (e) {
+      this.logger.error(e?.message)
+      throw new InternalServerErrorException(e?.message)
+    }
+  }
 
   public async deleteDeckById(id: string) {
     try {

src/modules/decks/infrastructure/grades.repository.ts

@@ -0,0 +1,59 @@
+import { Injectable, InternalServerErrorException, Logger } from '@nestjs/common'
+import { PrismaService } from '../../../prisma.service'
+
+@Injectable()
+export class GradesRepository {
+  constructor(private prisma: PrismaService) {}
+
+  private readonly logger = new Logger(GradesRepository.name)
+
+  async createGrade({
+    cardId,
+    userId,
+    deckId,
+    grade,
+  }: {
+    cardId: string
+    userId: string
+    deckId: string
+    grade: number
+  }) {
+    try {
+      return await this.prisma.grade.upsert({
+        where: {
+          userId,
+          cardId,
+          deckId,
+        },
+        update: {
+          grade,
+          shots: {
+            increment: 1,
+          },
+        },
+        create: {
+          grade,
+          shots: 1,
+          user: {
+            connect: {
+              id: userId,
+            },
+          },
+          card: {
+            connect: {
+              id: cardId,
+            },
+          },
+          deck: {
+            connect: {
+              id: deckId,
+            },
+          },
+        },
+      })
+    } catch (e) {
+      this.logger.error(e?.message)
+      throw new InternalServerErrorException(e?.message)
+    }
+  }
+}

src/modules/decks/use-cases/get-all-cards-in-deck-use-case.ts

@@ -2,6 +2,7 @@ import { CommandHandler, ICommandHandler } from '@nestjs/cqrs'
 import { CardsRepository } from '../../cards/infrastructure/cards.repository'
 import { GetAllCardsInDeckDto } from '../../cards/dto/get-all-cards.dto'
 import { ForbiddenException, NotFoundException } from '@nestjs/common'
+import { DecksRepository } from '../infrastructure/decks.repository'
 
 export class GetAllCardsInDeckCommand {
   constructor(
@@ -13,10 +14,13 @@ export class GetAllCardsInDeckCommand {
 
 @CommandHandler(GetAllCardsInDeckCommand)
 export class GetAllCardsInDeckHandler implements ICommandHandler<GetAllCardsInDeckCommand> {
-  constructor(private readonly cardsRepository: CardsRepository) {}
+  constructor(
+    private readonly cardsRepository: CardsRepository,
+    private readonly decksRepository: DecksRepository
+  ) {}
 
   async execute(command: GetAllCardsInDeckCommand) {
-    const deck = await this.cardsRepository.findDeckById(command.deckId)
+    const deck = await this.decksRepository.findDeckById(command.deckId)
     if (!deck) throw new NotFoundException(`Deck with id ${command.deckId} not found`)
 
     if (deck.userId !== command.userId && deck.isPrivate) {

src/modules/decks/use-cases/get-random-card-in-deck-use-case.ts

@@ -0,0 +1,53 @@
+import { CommandHandler, ICommandHandler } from '@nestjs/cqrs'
+import { CardsRepository } from '../../cards/infrastructure/cards.repository'
+import { ForbiddenException, NotFoundException } from '@nestjs/common'
+import { DecksRepository } from '../infrastructure/decks.repository'
+import { Prisma } from '@prisma/client'
+import { pick } from 'remeda'
+
+export class GetRandomCardInDeckCommand {
+  constructor(public readonly userId: string, public readonly deckId: string) {}
+}
+type CardWithGrade = Prisma.cardGetPayload<{ include: { grades: true } }>
+@CommandHandler(GetRandomCardInDeckCommand)
+export class GetRandomCardInDeckHandler implements ICommandHandler<GetRandomCardInDeckCommand> {
+  constructor(
+    private readonly cardsRepository: CardsRepository,
+    private readonly decksRepository: DecksRepository
+  ) {}
+  private async getSmartRandomCard(cards: Array<CardWithGrade>) {
+    const selectionPool: Array<CardWithGrade> = []
+    cards.forEach(card => {
+      // Calculate the average grade for the card
+      const averageGrade =
+        card.grades.length === 0
+          ? 0
+          : card.grades.reduce((acc, grade) => acc + grade.grade, 0) / card.grades.length
+      // Calculate weight for the card, higher weight for lower grade card
+      const weight = 6 - averageGrade
+
+      // Add the card to the selection pool `weight` times
+      for (let i = 0; i < weight; i++) {
+        selectionPool.push(card)
+      }
+    })
+
+    return selectionPool[Math.floor(Math.random() * selectionPool.length)]
+  }
+
+  async execute(command: GetRandomCardInDeckCommand) {
+    const deck = await this.decksRepository.findDeckById(command.deckId)
+    if (!deck) throw new NotFoundException(`Deck with id ${command.deckId} not found`)
+
+    if (deck.userId !== command.userId && deck.isPrivate) {
+      throw new ForbiddenException(`You can't get a private deck that you don't own`)
+    }
+
+    const cards = await this.cardsRepository.findCardsByDeckIdWithGrade(
+      command.userId,
+      command.deckId
+    )
+    const smartRandomCard = await this.getSmartRandomCard(cards)
+    return pick(smartRandomCard, ['id', 'question', 'answer', 'deckId'])
+  }
+}

src/modules/decks/use-cases/save-grade-use-case.ts

@@ -0,0 +1,41 @@
+import { CommandHandler, ICommandHandler } from '@nestjs/cqrs'
+import { CardsRepository } from '../../cards/infrastructure/cards.repository'
+import { ForbiddenException, NotFoundException } from '@nestjs/common'
+import { DecksRepository } from '../infrastructure/decks.repository'
+import { GradesRepository } from '../infrastructure/grades.repository'
+
+export class SaveGradeCommand {
+  constructor(
+    public readonly userId: string,
+    public readonly args: {
+      cardId: string
+      grade: number
+    }
+  ) {}
+}
+
+@CommandHandler(SaveGradeCommand)
+export class SaveGradeHandler implements ICommandHandler<SaveGradeCommand> {
+  constructor(
+    private readonly cardsRepository: CardsRepository,
+    private readonly decksRepository: DecksRepository,
+    private readonly gradesRepository: GradesRepository
+  ) {}
+
+  async execute(command: SaveGradeCommand) {
+    const deck = await this.decksRepository.findDeckByCardId(command.args.cardId)
+    if (!deck)
+      throw new NotFoundException(`Deck containing card with id ${command.args.cardId} not found`)
+
+    if (deck.userId !== command.userId && deck.isPrivate) {
+      throw new ForbiddenException(`You can't save cards to  a private deck that you don't own`)
+    }
+
+    return await this.gradesRepository.createGrade({
+      userId: command.userId,
+      grade: command.args.grade,
+      cardId: command.args.cardId,
+      deckId: deck.id,
+    })
+  }
+}

src/prisma.service.ts

@@ -29,10 +29,16 @@ export class PrismaService extends PrismaClient implements OnModuleInit {
   async onModuleInit() {
     await this.$connect()
   }
-
-  async enableShutdownHooks(app: INestApplication) {
-    this.$on('beforeExit', async () => {
+  private exitHandler(app: INestApplication) {
+    return async () => {
       await app.close()
-    })
+    }
+  }
+  async enableShutdownHooks(app: INestApplication) {
+    process.on('exit', this.exitHandler(app))
+    process.on('beforeExit', this.exitHandler(app))
+    process.on('SIGINT', this.exitHandler(app))
+    process.on('SIGTERM', this.exitHandler(app))
+    process.on('SIGUSR2', this.exitHandler(app))
   }
 }