<?php

namespace Tests\Unit;

use App\Models\Student;
use App\Models\StudentContract;
use Illuminate\Support\Carbon;
use Illuminate\Database\Eloquent\Relations\HasMany;
use Illuminate\Database\Eloquent\Builder;
use Tests\TestCase;

class StudentStatusTest extends TestCase
{
    private function createStudentWithContracts($contracts)
    {
        $mockRelation = $this->getMockBuilder(HasMany::class)
            ->disableOriginalConstructor()
            ->onlyMethods(['__call'])
            ->getMock();

        $mockBuilder = $this->getMockBuilder(Builder::class)
            ->disableOriginalConstructor()
            ->getMock();

        $mockBuilder->method('get')->willReturn($contracts);
        $mockRelation->method('__call')
            ->with('latestVersion', [])
            ->willReturn($mockBuilder);

        $student = new class($mockRelation) extends Student {
            private $mockRelation;

            public function __construct($mockRelation = null) {
                parent::__construct();
                if ($mockRelation) {
                    $this->mockRelation = $mockRelation;
                }
            }

            public function contracts(): HasMany
            {
                return $this->mockRelation;
            }
        };

        return $student;
    }

    public function test_student_without_contracts_is_lead(): void
    {
        $student = $this->createStudentWithContracts(collect([]));
        $this->assertSame(Student::STATUS_LEAD, $student->calculateStatus());
    }

    public function test_student_with_active_contract_in_future_is_active(): void
    {
        $contract = new StudentContract;
        $contract->status = 'active';
        $contract->end_date = Carbon::now()->addDays(10);

        $student = $this->createStudentWithContracts(collect([$contract]));
        $this->assertSame(Student::STATUS_ACTIVE, $student->calculateStatus());
    }

    public function test_student_with_active_contract_in_past_is_ex_student(): void
    {
        $contract = new StudentContract;
        $contract->status = 'active';
        $contract->end_date = Carbon::now()->subDays(10); // Expired

        $student = $this->createStudentWithContracts(collect([$contract]));
        $this->assertSame(Student::STATUS_EX_STUDENT, $student->calculateStatus());
    }

    public function test_student_with_frozen_contract_and_no_active_is_locked(): void
    {
        $contract = new StudentContract;
        $contract->status = 'frozen';
        $contract->end_date = Carbon::now()->addDays(10);

        $student = $this->createStudentWithContracts(collect([$contract]));
        $this->assertSame(Student::STATUS_LOCKED, $student->calculateStatus());
    }

    public function test_student_with_cancelled_contracts_only_is_ex_student(): void
    {
        $contract = new StudentContract;
        $contract->status = 'cancelled';
        $contract->end_date = Carbon::now()->addDays(10);

        $student = $this->createStudentWithContracts(collect([$contract]));
        $this->assertSame(Student::STATUS_EX_STUDENT, $student->calculateStatus());
    }
}