<?php

namespace Tests\Unit\Services\Parents;

use App\Services\Parents\ParentInvoiceService;
use Illuminate\Foundation\Testing\RefreshDatabase;
use Illuminate\Support\Facades\DB;
use Tests\TestCase;

class ParentInvoiceServiceTest extends TestCase
{
    use RefreshDatabase;

    public function test_list_invoices_filters_by_parent(): void
    {
        $parentId = $this->seedParent();
        $otherParentId = $this->seedParent('other@example.com');

        DB::table('invoices')->insert([
            'parent_id' => $parentId,
            'invoice_number' => 'INV-1',
            'total_amount' => 100,
            'paid_amount' => 0,
            'balance' => 100,
            'issue_date' => '2025-09-01',
        ]);

        DB::table('invoices')->insert([
            'parent_id' => $otherParentId,
            'invoice_number' => 'INV-2',
            'total_amount' => 50,
            'paid_amount' => 0,
            'balance' => 50,
            'issue_date' => '2025-09-02',
        ]);

        $service = new ParentInvoiceService;
        $rows = $service->listInvoices($parentId);

        $this->assertCount(1, $rows);
        $this->assertSame('INV-1', $rows[0]['invoice_number']);
    }

    public function test_list_invoices_derives_payment_totals_from_payments_table(): void
    {
        $parentId = $this->seedParent();

        $invoiceId = DB::table('invoices')->insertGetId([
            'parent_id' => $parentId,
            'invoice_number' => 'INV-PAY',
            'total_amount' => 100,
            'paid_amount' => 0,
            'balance' => 100,
            'issue_date' => '2025-09-01',
            'due_date' => '2025-10-01',
            'status' => 'Unpaid',
            'school_year' => '2025-2026',
            'semester' => 'Fall',
            'created_at' => now(),
            'updated_at' => now(),
        ]);

        DB::table('payments')->insert([
            [
                'parent_id' => $parentId,
                'invoice_id' => $invoiceId,
                'total_amount' => 100,
                'paid_amount' => 40,
                'balance' => 60,
                'number_of_installments' => 1,
                'payment_method' => 'Check',
                'payment_date' => '2025-09-15',
                'transaction_id' => 'CHK-1',
                'status' => 'Paid',
                'school_year' => '2025-2026',
                'semester' => 'Fall',
                'created_at' => now(),
                'updated_at' => now(),
            ],
            [
                'parent_id' => $parentId,
                'invoice_id' => $invoiceId,
                'total_amount' => 100,
                'paid_amount' => 25,
                'balance' => 35,
                'number_of_installments' => 1,
                'payment_method' => 'Online',
                'payment_date' => '2025-09-16',
                'transaction_id' => 'PENDING-1',
                'status' => 'Pending',
                'school_year' => '2025-2026',
                'semester' => 'Fall',
                'created_at' => now(),
                'updated_at' => now(),
            ],
        ]);

        $service = new ParentInvoiceService;
        $rows = $service->listInvoices($parentId, '2025-2026');

        $this->assertCount(1, $rows);
        $this->assertSame(40.0, $rows[0]['paid_amount']);
        $this->assertSame(60.0, $rows[0]['balance']);
        $this->assertSame('Partially Paid', $rows[0]['status']);
        $this->assertCount(1, $rows[0]['payments']);
        $this->assertSame('CHK-1', $rows[0]['payments'][0]['transaction_id']);
    }

    public function test_list_invoices_applies_discounts_to_balance(): void
    {
        $parentId = $this->seedParent();

        $invoiceId = DB::table('invoices')->insertGetId([
            'parent_id' => $parentId,
            'invoice_number' => 'INV-DISCOUNT',
            'total_amount' => 380,
            'paid_amount' => 10,
            'balance' => 370,
            'has_discount' => 1,
            'issue_date' => '2025-09-06',
            'due_date' => '2025-09-21',
            'status' => 'Paid',
            'school_year' => '2025-2026',
            'semester' => 'Fall',
            'created_at' => now(),
            'updated_at' => now(),
        ]);

        DB::table('payments')->insert([
            'parent_id' => $parentId,
            'invoice_id' => $invoiceId,
            'total_amount' => 380,
            'paid_amount' => 10,
            'balance' => 370,
            'number_of_installments' => 1,
            'payment_method' => 'Cash',
            'payment_date' => '2025-09-10',
            'status' => 'Paid',
            'school_year' => '2025-2026',
            'semester' => 'Fall',
            'created_at' => now(),
            'updated_at' => now(),
        ]);

        DB::table('discount_usages')->insert([
            'voucher_id' => 1,
            'parent_id' => $parentId,
            'invoice_id' => $invoiceId,
            'discount_amount' => 370,
            'description' => 'Tuition discount',
            'school_year' => '2025-2026',
            'semester' => 'Fall',
        ]);

        $service = new ParentInvoiceService;
        $rows = $service->listInvoices($parentId, '2025-2026');

        $this->assertSame(10.0, $rows[0]['paid_amount']);
        $this->assertSame(370.0, $rows[0]['discount']);
        $this->assertSame(0.0, $rows[0]['balance']);
        $this->assertSame('Paid', $rows[0]['status']);
    }

    public function test_statement_derives_current_balance_from_computed_invoice_lines(): void
    {
        $parentId = $this->seedParent();

        $invoiceId = DB::table('invoices')->insertGetId([
            'parent_id' => $parentId,
            'invoice_number' => 'INV-STMT-DISCOUNT',
            'total_amount' => 380,
            'paid_amount' => 10,
            'balance' => 370,
            'has_discount' => 1,
            'issue_date' => '2025-09-06',
            'due_date' => '2025-09-21',
            'status' => 'Paid',
            'school_year' => '2025-2026',
            'semester' => 'Fall',
            'created_at' => now(),
            'updated_at' => now(),
        ]);

        DB::table('parent_accounts')->insert([
            'parent_id' => $parentId,
            'school_year' => '2025-2026',
            'opening_balance' => 0,
            'current_balance' => 370,
            'created_at' => now(),
            'updated_at' => now(),
        ]);

        DB::table('payments')->insert([
            'parent_id' => $parentId,
            'invoice_id' => $invoiceId,
            'total_amount' => 380,
            'paid_amount' => 10,
            'balance' => 370,
            'number_of_installments' => 1,
            'payment_method' => 'Cash',
            'payment_date' => '2025-09-10',
            'status' => 'Paid',
            'school_year' => '2025-2026',
            'semester' => 'Fall',
            'created_at' => now(),
            'updated_at' => now(),
        ]);

        DB::table('discount_usages')->insert([
            'voucher_id' => 1,
            'parent_id' => $parentId,
            'invoice_id' => $invoiceId,
            'discount_amount' => 370,
            'description' => 'Tuition discount',
            'school_year' => '2025-2026',
            'semester' => 'Fall',
        ]);

        $service = new ParentInvoiceService;
        $statement = $service->statement($parentId, '2025-2026');

        $this->assertSame(0.0, $statement['lines'][0]['amount']);
        $this->assertSame(0.0, $statement['current_balance']);
    }

    private function seedParent(string $email = 'parent@example.com'): int
    {
        return DB::table('users')->insertGetId([
            'firstname' => 'Parent',
            'lastname' => 'User',
            'cellphone' => '1234567890',
            'email' => $email,
            'address_street' => '123 Street',
            'city' => 'City',
            'state' => 'ST',
            'zip' => '12345',
            'accept_school_policy' => 1,
            'password' => bcrypt('password'),
            'user_type' => 'primary',
            'semester' => 'Fall',
            'school_year' => '2025-2026',
            'status' => 'Active',
        ]);
    }
}