[beta] feature: add budget backend logic

app/Models/Budget.php

@@ -0,0 +1,86 @@
+<?php
+
+namespace App\Models;
+
+use Carbon\CarbonPeriod;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Relations\BelongsToMany;
+
+class Budget extends Model
+{
+    use HasFactory;
+
+    const CUSTOM = "CUSTOM";
+    const DAILY = "DAILY";
+    const WEEKLY = "WEEKLY";
+    const MONTHLY = "MONTHLY";
+    const YEARLY = "YEARLY";
+
+    protected $guarded = [];
+
+    protected $casts = [
+        'start_at' => 'datetime',
+        'end_at' => 'datetime',
+    ];
+
+    /**
+     * @return BelongsToMany
+     */
+    public function categories(): BelongsToMany
+    {
+        return $this->belongsToMany(Category::class);
+    }
+
+    public function getStartAtDateAttribute()
+    {
+        return $this->getCurrentWindowStartAndEndDates()[0]->format('Y-m-d');
+    }
+
+    public function getEndAtDateAttribute()
+    {
+        return $this->getCurrentWindowStartAndEndDates()[1]->format('Y-m-d');
+    }
+
+    public function getTotalAccumulatedTransactionsAmountAttribute()
+    {
+        $categories = $this->categories()->with('transactions')->get();
+        [$startAt, $endAt] = $this->getCurrentWindowStartAndEndDates();
+
+        return $categories->sum(function ($category) use ($startAt, $endAt){
+            return $category->transactions()
+                ->whereBetween('transactions.created_at', [$startAt, $endAt])
+                ->sum('amount');
+        });
+    }
+
+    private function getCurrentWindowStartAndEndDates()
+    {
+        if($this->reoccurrence === self::CUSTOM) {
+            return [$this->start_at, $this->end_at];
+        }
+
+        $unit = $this->getUnitMapping();
+        $intervalString = $this->period . ' ' . $unit;
+        $ranges = CarbonPeriod::create($this->start_at->startOfDay(), $intervalString, now()->copy()->add($unit, $this->period))->toArray();
+
+        foreach (array_reverse($ranges) as $range) {
+            if(now()->isAfter($range)) {
+                return [$range->copy(), $range->copy()->add($unit, $this->period)];
+            }
+        }
+    }
+
+    /**
+     * @return string
+     */
+    private function getUnitMapping(): string
+    {
+        return [
+            self::DAILY => 'day',
+            self::WEEKLY => 'week',
+            self::MONTHLY => 'month',
+            self::YEARLY => 'year',
+        ][$this->reoccurrence];
+    }
+}

app/Models/Category.php

@@ -5,7 +5,9 @@
 use App\Contracts\Searchable;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Builder;
+use Illuminate\Database\Eloquent\Relations\HasMany;
 use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Relations\HasManyThrough;
 
 class Category extends Model implements Searchable
 {
@@ -18,18 +20,32 @@ class Category extends Model implements Searchable
 
     protected $guarded = [];
 
-    protected static function booted()
+    /**
+     * @return void
+     */
+    protected static function booted(): void
     {
         static::deleted(function ($category) {
             $category->brands->each->delete();
         });
     }
 
-    public function brands()
+    /**
+     * @return HasMany
+     */
+    public function brands(): HasMany
     {
         return $this->hasMany(Brand::class);
     }
 
+    /**
+     * @return HasManyThrough
+     */
+    public function transactions(): HasManyThrough
+    {
+        return $this->hasManyThrough(Transaction::class, Brand::class);
+    }
+
     /**
      * @param $query
      * @return Builder

app/Models/Sms.php

@@ -6,7 +6,6 @@
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Builder;
 use Illuminate\Database\Eloquent\Factories\HasFactory;
-use function PHPUnit\Framework\isEmpty;
 
 class Sms extends Model implements Searchable
 {

database/factories/BudgetFactory.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace Database\Factories;
+
+use App\Models\Budget;
+use Illuminate\Database\Eloquent\Factories\Factory;
+
+/**
+ * @extends \Illuminate\Database\Eloquent\Factories\Factory<\App\Models\Budget>
+ */
+class BudgetFactory extends Factory
+{
+    /**
+     * Define the model's default state.
+     *
+     * @return array<string, mixed>
+     */
+    public function definition(): array
+    {
+        return [
+            'name' => $this->faker->name(),
+            'amount' => $this->faker->numberBetween(),
+            'start_at' => now(),
+            'reoccurrence' => Budget::DAILY,
+            'period' => 1,
+        ];
+    }
+}

database/migrations/2024_04_21_173031_create_budgets_table.php

@@ -0,0 +1,34 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::create('budgets', function (Blueprint $table) {
+            $table->id();
+            $table->string('name');
+            $table->decimal('amount');
+            $table->dateTime('start_at');
+            $table->dateTime('end_at')->nullable();
+            $table->boolean('saving')->default(false);
+            $table->unsignedInteger('period')->default(1);
+            $table->string('reoccurrence');
+            $table->timestamps();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::dropIfExists('budgets');
+    }
+};

database/migrations/2024_04_22_011017_create_budget_category_table.php

@@ -0,0 +1,29 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::create('budget_category', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('budget_id')->constrained()->onDelete('cascade');
+            $table->foreignId('category_id')->constrained()->onDelete('cascade');
+            $table->timestamps();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::dropIfExists('budget_category');
+    }
+};

graphql/schema.graphql

@@ -14,6 +14,14 @@ type Category {
     color: String
 }
 
+type Budget {
+    id: ID!
+    amount: Float!
+    totalAccumulatedTransactionsAmount: Float!
+    startAtDate: String!
+    endAtDate: String!
+}
+
 type Brand {
     id: ID!
     name: String!
@@ -48,6 +56,7 @@ type Query {
         @orderBy(column: id direction: DESC)
 
     allBrands: [Brand!]! @all
+    budgets: [Budget!]! @all
     brands(search: String @search): [Brand!]!
         @paginate(defaultCount: 50)
         @lazyLoad(relations: ["category"])

tests/Unit/Models/Budgets/BudgetTest.php

@@ -0,0 +1,65 @@
+<?php
+
+namespace Tests\Unit\Models\Budgets;
+
+use Tests\TestCase;
+use App\Models\Brand;
+use App\Models\Budget;
+use App\Models\Category;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+
+class BudgetTest extends TestCase
+{
+    use RefreshDatabase;
+
+    /** @test */
+    public function it_has_name()
+    {
+        $sut = Budget::factory()->create(['name' => 'test']);
+
+        $this->assertEquals("test", $sut->name);
+    }
+
+    /** @test */
+    public function it_belongs_to_categories()
+    {
+        $categories = Category::factory()->createMany(3);
+        $sut = Budget::factory()->create();
+        $sut->categories()->attach($categories);
+
+        $this->assertCount(3, $sut->categories);
+    }
+
+    /** @test */
+    public function it_has_total_categories_transactions_amount()
+    {
+        $category = Category::factory()->create();
+        $brand = Brand::factory()->create(['category_id' => $category->id]);
+        $sut = Budget::factory()->create(['start_at' => now()->subDays(1), 'end_at' => now()->addDays(1)]);
+        $sut->categories()->attach($category);
+
+        $category->transactions()->create(['amount' => 100, 'brand_id' => $brand->id]);
+        $category->transactions()->create(['amount' => 200, 'brand_id' => $brand->id]);
+        $category->transactions()->create(['amount' => 200, 'brand_id' => $brand->id, 'created_at' => now()->addDays(2)]);
+
+        $this->assertEquals(300, $sut->totalAccumulatedTransactionsAmount);
+    }
+
+    /** @test */
+    public function it_has_start_and_end_at()
+    {
+        $sut = Budget::factory()->create(['start_at' => now()->subDays(1), 'end_at' => now()->addDays(1)]);
+
+        $this->assertEquals(now()->subDays(1)->format('Y-m-d'), $sut->start_at->format('Y-m-d'));
+        $this->assertEquals(now()->addDays(1)->format('Y-m-d'), $sut->end_at->format('Y-m-d'));
+    }
+
+    /** @test */
+    public function it_has_start_and_end_dates_window()
+    {
+        $sut = Budget::factory()->create(['start_at' => now()->subDays(1), 'period' => 1, 'reoccurrence' => Budget::DAILY]);
+
+        $this->assertEquals(now()->format('Y-m-d'), $sut->startAtDate);
+        $this->assertEquals(now()->addDays(1)->format('Y-m-d'), $sut->endAtDate);
+    }
+}