feat: #6 show past and future weeks based on company service id

backend/app/controllers/weeks_controller.rb

@@ -1,16 +1,5 @@
 class WeeksController < ApplicationController
   def index
-    @weeks_past = [{
-      id: "2024-32",
-      label: "Semana 32 del 2024",
-      start_date: "05/08/2024",
-      end_date: "11/08/2024"
-    }]
-    @weeks_future = [{
-      id: "2024-33",
-      label: "Semana 33 del 2024",
-      start_date: "12/08/2024",
-      end_date: "18/08/2024"
-    }]
+    @weeks = WeekService.generate_weeks_data(params[:company_service_id])
   end
 end

backend/app/services/week_service.rb

@@ -0,0 +1,68 @@
+class WeekService
+
+  def self.generate_weeks_data(company_service_id)
+    company_service = CompanyService.find(company_service_id)
+    start_date = company_service.contract_start_date.to_date
+    end_date = company_service.contract_end_date.to_date
+
+    current_date = Date.today
+    past_weeks = []
+    future_weeks = []
+
+    if date_in_contract?(start_date, end_date, current_date)
+      past_weeks = fetch_past(current_date, start_date)
+      future_weeks = fetch_future(current_date, end_date)
+    else
+      past_weeks = fetch_past(end_date, start_date)
+    end
+    { past: past_weeks, future: future_weeks }
+  end
+
+  ## REFACTOR: make private, just validate based on 2 contracts
+  def self.date_in_contract?(start_date, end_date, date)
+    # service.contract_start_date <= date && date <= service.contract_end_date
+    (start_date..end_date).cover?(date)
+  end
+
+  def self.week_identifier(date)
+    "#{date.year}-#{date.strftime('%W')}"
+  end
+
+  def self.one_week(week_start, week_end)
+    {
+      id: week_identifier(week_start),
+      label: "Semana #{week_start.strftime('%W')} del #{week_start.year}",
+      start_date: week_start.strftime('%d/%m/%Y'),
+      end_date: week_end.strftime('%d/%m/%Y')
+    }
+  end
+
+  def self.fetch_past(date, start_date_limit)
+    first_monday = start_date_limit.beginning_of_week
+    weeks = []
+    mondays = [date.beginning_of_week]
+    while mondays.last > first_monday
+      week_start = mondays.last.last_week
+      week_end = week_start.end_of_week
+      weeks << one_week(week_start, week_end)
+      mondays << week_start
+    end
+    weeks
+  end
+
+  def self.fetch_future(date, end_date_limit)
+    weeks = []
+    week_start = date.beginning_of_week
+    5.times do
+      week_end = week_start.end_of_week
+
+      break if week_start > end_date_limit
+      weeks << one_week(week_start, week_end)
+
+      week_start = week_start.next_week
+    end
+
+    weeks
+  end
+
+end

backend/spec/services/week_service_spec.rb

@@ -0,0 +1,161 @@
+require 'rails_helper'
+
+RSpec.describe WeekService, type: :service do
+  describe '.week_identifier' do
+    it 'returns the correct week identifier' do
+      date = Date.new(2024, 8, 5) # Lunes 5 de Agosto del 2024
+      expected_identifier = "2024-32"
+
+      result = WeekService.week_identifier(date)
+
+      expect(result).to eq(expected_identifier)
+    end
+  end
+
+  describe '.one_week' do
+    it 'returns the correct week structure' do
+      week_start = Date.new(2024, 8, 5) # Lunes 5 de Agosto del 2024
+      week_end = week_start.end_of_week  # Domingo 11 de Agosto del 2024
+
+      expected_week = {
+        id: "2024-32",
+        label: "Semana 32 del 2024",
+        start_date: "05/08/2024",
+        end_date: "11/08/2024"
+      }
+
+      result = WeekService.one_week(week_start, week_end)
+
+      expect(result).to eq(expected_week)
+    end
+  end
+
+  describe '.fetch_past' do
+    it 'returns all past weeks until the contract start date' do
+      today = Date.new(2024, 8, 5) ## Lunes 5 de Agosto del 2024
+      start_date_limit = Date.new(2024, 7, 15) # Lunes 15 de Julio del 2024
+
+      expected_past_weeks = [
+        {
+          id: "2024-31",
+          label: "Semana 31 del 2024",
+          start_date: "29/07/2024",
+          end_date: "04/08/2024"
+        },
+        {
+          id: "2024-30",
+          label: "Semana 30 del 2024",
+          start_date: "22/07/2024",
+          end_date: "28/07/2024"
+        },
+        {
+          id: "2024-29",
+          label: "Semana 29 del 2024",
+          start_date: "15/07/2024",
+          end_date: "21/07/2024"
+        }
+      ]
+
+      result = WeekService.fetch_past(today, start_date_limit)
+
+      expect(result).to eq(expected_past_weeks)
+    end
+  end
+  describe '.fetch_future' do
+    context 'when there are enough weeks before the end_date_limit' do
+      it 'returns 5 weeks' do
+        date = Date.new(2024, 8, 15) # Jueves 15 de Agosto del 2024
+        end_date_limit = Date.new(2024, 10, 31) # 31 de Octubre del 2024
+
+        expected_future_weeks = [
+          {
+            id: "2024-33",
+            label: "Semana 33 del 2024",
+            start_date: "12/08/2024",
+            end_date: "18/08/2024"
+          },
+          {
+            id: "2024-34",
+            label: "Semana 34 del 2024",
+            start_date: "19/08/2024",
+            end_date: "25/08/2024"
+          },
+          {
+            id: "2024-35",
+            label: "Semana 35 del 2024",
+            start_date: "26/08/2024",
+            end_date: "01/09/2024"
+          },
+          {
+            id: "2024-36",
+            label: "Semana 36 del 2024",
+            start_date: "02/09/2024",
+            end_date: "08/09/2024"
+          },
+          {
+            id: "2024-37",
+            label: "Semana 37 del 2024",
+            start_date: "09/09/2024",
+            end_date: "15/09/2024"
+          }
+        ]
+
+        result = WeekService.fetch_future(date, end_date_limit)
+
+        expect(result).to eq(expected_future_weeks)
+      end
+    end
+
+    context 'when the end_date_limit restricts the number of weeks' do
+      it 'returns only the weeks within the end_date_limit' do
+        date = Date.new(2024, 8, 15) # Jueves 15 de Agosto del 2024
+        end_date_limit = Date.new(2024, 9, 1)  # Domingo 1 de Setiembre del 2024
+
+        expected_future_weeks = [
+          {
+            id: "2024-33",
+            label: "Semana 33 del 2024",
+            start_date: "12/08/2024",
+            end_date: "18/08/2024"
+          },
+          {
+            id: "2024-34",
+            label: "Semana 34 del 2024",
+            start_date: "19/08/2024",
+            end_date: "25/08/2024"
+          },
+          {
+            id: "2024-35",
+            label: "Semana 35 del 2024",
+            start_date: "26/08/2024",
+            end_date: "01/09/2024"
+          }
+        ]
+
+        result = WeekService.fetch_future(date, end_date_limit)
+
+        expect(result).to eq(expected_future_weeks)
+      end
+    end
+
+    context 'when the end_date_limit is very close' do
+      it 'returns only one week if limit restricts it to 1 week' do
+        date = Date.new(2024, 8, 15) # Jueves 15 de Agosto del 2024
+        end_date_limit = Date.new(2024, 8, 18) # Only allows for 1 week
+
+        expected_future_weeks = [
+          {
+            id: "2024-33",
+            label: "Semana 33 del 2024",
+            start_date: "12/08/2024",
+            end_date: "18/08/2024"
+          }
+        ]
+
+        result = WeekService.fetch_future(date, end_date_limit)
+
+        expect(result).to eq(expected_future_weeks)
+      end
+    end
+  end
+end