<?php

namespace Tests\App\Services;

use App\Services\EmailService;
use App\Services\EnrollmentRegistrationEmailService;
use App\Services\EnrollmentTransitionService;
use App\Support\Enrollment\DeliberationDecision;
use App\Models\ConfigurationModel;
use CodeIgniter\Database\BaseBuilder;
use CodeIgniter\Database\BaseConnection;
use PHPUnit\Framework\TestCase;

final class EnrollmentRegistrationEmailServiceTest extends TestCase
{
    public function testPassedStudentMessageStaysConcise(): void
    {
        $service = $this->service();

        $evaluation = [
            'deliberation_decision' => DeliberationDecision::PASSED,
            'placement_status' => 'exit_required',
            'source_grade_name' => '8',
            'adult_student' => false,
            'blockers' => [
                'The student has passed the highest available grade and must follow the school completion or exit process.',
                'Registration for the new school year has not opened yet.',
            ],
        ];

        $status = $this->invoke($service, 'registrationStatus', [$evaluation]);
        $message = $this->invoke($service, 'decisionMessage', ['Student Name', $evaluation, 'August 1, 2026', 'August 31, 2026']);
        $action = $this->invoke($service, 'requiredAction', [$evaluation, 'August 31, 2026']);

        $this->assertSame('Eligible', $status);
        $this->assertStringContainsString('Student Name has successfully passed Grade 8.', $message);
        $this->assertStringNotContainsString('Re-enrollment for the new school year will open on August 1, 2026.', $message);
        $this->assertStringNotContainsString('Please make sure to re-enroll your child before August 31, 2026', $message);
        $this->assertStringNotContainsString('sign in to the parent portal', $message);
        $this->assertStringContainsString('Complete re-enrollment before August 31, 2026.', $action);
        $this->assertStringNotContainsString('Not Eligible', $status);
        $this->assertStringNotContainsString('Registration for the new school year has not opened yet', $message);
        $this->assertStringNotContainsString('Contact the school administration.', $action);
    }

    public function testFinancialSectionIsHiddenWhenNothingIsDue(): void
    {
        $service = $this->service();

        $html = $this->invoke($service, 'financialSection', [10, [
            'registration_fee' => 0,
            'tuition_due_at_registration' => 0,
            'mandatory_fees' => 0,
        ], null]);

        $this->assertSame('', $html);
    }

    public function testMakeupExamDecisionMessageUsesConfiguredDate(): void
    {
        $configModel = $this->createMock(ConfigurationModel::class);
        $configModel->expects($this->once())
            ->method('getConfig')
            ->with('make-up-exam')
            ->willReturn('2026-09-13');

        $service = $this->service(configModel: $configModel);

        $message = $this->invoke($service, 'decisionMessage', ['Student Name', [
            'deliberation_decision' => DeliberationDecision::MAKE_UP_EXAM,
            'blockers' => [],
        ], 'August 1, 2026', 'August 31, 2026']);

        $this->assertStringContainsString('The final academic decision for Student Name is currently pending the result of a make-up exam.', $message);
        $this->assertStringContainsString('This exam is scheduled for 09-13-2026 from 9:30 AM to 11:00 AM at ISGL.', $message);
        $this->assertStringContainsString("\n" . 'The exam result will determine whether the student advances to the next grade or repeats the current class. Failure to attend the make-up exam will automatically result in the student repeating the class, as no further retake opportunities will be available.', $message);
        $this->assertStringContainsString("\n" . 'You must re-enroll Student Name before the make-up exam can be taken.', $message);
        $this->assertStringNotContainsString('on date  at ISGL', $message);

        $action = $this->invoke($service, 'requiredAction', [[
            'deliberation_decision' => DeliberationDecision::MAKE_UP_EXAM,
            'blockers' => [],
        ], 'August 31, 2026', 'Student Name']);

        $this->assertSame('', $action);
    }

    public function testKgMissingDecisionEligibleMessageAllowsRegistration(): void
    {
        $service = $this->service();

        $message = $this->invoke($service, 'decisionMessage', ['Student Name', [
            'can_enroll' => false,
            'kg_missing_decision_eligible' => true,
            'deliberation_decision' => DeliberationDecision::PASSED,
            'placement_status' => 'automatic_distribution_pending',
            'assigned_grade_name' => '1',
            'blocking_rule_codes' => ['NO_FINAL_DECISION'],
            'blockers' => ['Re-enrollment cannot currently be completed because no final deliberation decision is recorded for the student. Registration will become available after the school records a final decision.'],
        ], 'August 1, 2026', 'August 31, 2026']);
        $status = $this->invoke($service, 'registrationStatus', [[
            'can_enroll' => false,
            'kg_missing_decision_eligible' => true,
            'deliberation_decision' => DeliberationDecision::PASSED,
            'blocking_rule_codes' => ['NO_FINAL_DECISION'],
            'blockers' => ['Re-enrollment cannot currently be completed because no final deliberation decision is recorded for the student. Registration will become available after the school records a final decision.'],
        ]]);

        $this->assertSame('Eligible', $status);
        $this->assertStringContainsString('KG students may complete registration now.', $message);
        $this->assertStringContainsString('Student Name is eligible for re-enrollment even though no final deliberation decision is recorded.', $message);
        $this->assertStringContainsString('Grade 1', $message);
        $this->assertStringNotContainsString('cannot currently be completed', $message);
    }

    public function testAlreadyEnrolledStatusDoesNotRenderAsNotEligible(): void
    {
        $service = $this->service();

        $status = $this->invoke($service, 'registrationStatus', [[
            'can_enroll' => false,
            'deliberation_decision' => DeliberationDecision::PASSED,
            'decision' => 'ALREADY_ENROLLED',
            'primary_block_reason' => 'ALREADY_ENROLLED',
            'blocking_rule_codes' => ['ALREADY_ENROLLED'],
            'blockers' => ['This student is already enrolled for the selected school year.'],
            'enrollment_status' => 'enrolled',
        ]]);

        $this->assertSame('Already Enrolled', $status);
    }

    public function testMakeupExamDecisionMessageUsesSchoolYearDateBeforeConfig(): void
    {
        $configModel = $this->createMock(ConfigurationModel::class);
        $configModel->expects($this->never())->method('getConfig');

        $service = $this->service(configModel: $configModel);

        $message = $this->invoke($service, 'decisionMessage', ['Student Name', [
            'deliberation_decision' => DeliberationDecision::MAKE_UP_EXAM,
            'blockers' => [],
        ], 'August 1, 2026', 'August 31, 2026', [
            'fall_makeup_exam_on' => '2026-09-13',
        ]]);

        $this->assertStringContainsString('This exam is scheduled for 09-13-2026 from 9:30 AM to 11:00 AM at ISGL.', $message);
        $this->assertStringNotContainsString('a date to be announced', $message);
    }

    public function testMakeupExamDecisionMessageFallsBackToSyncedConfigKeys(): void
    {
        $configModel = $this->createMock(ConfigurationModel::class);
        $configModel->expects($this->exactly(2))
            ->method('getConfig')
            ->willReturnMap([
                ['make-up-exam', ''],
                ['make_up_exam', '2026-09-13'],
            ]);

        $service = $this->service(configModel: $configModel);

        $message = $this->invoke($service, 'decisionMessage', ['Student Name', [
            'deliberation_decision' => DeliberationDecision::MAKE_UP_EXAM,
            'blockers' => [],
        ], 'August 1, 2026', 'August 31, 2026']);

        $this->assertStringContainsString('This exam is scheduled for 09-13-2026 from 9:30 AM to 11:00 AM at ISGL.', $message);
    }

    public function testMakeupExamStudentRowRendersMessageLineBreaks(): void
    {
        $configModel = $this->createMock(ConfigurationModel::class);
        $configModel->method('getConfig')
            ->with('make-up-exam')
            ->willReturn('2026-09-13');

        $service = $this->service(configModel: $configModel);

        $html = $this->invoke($service, 'studentRow', [[
            'firstname' => 'Student',
            'lastname' => 'Name',
        ], [
            'deliberation_decision' => DeliberationDecision::MAKE_UP_EXAM,
            'placement_status' => 'temporary_same_grade',
            'blockers' => [],
        ], 'August 1, 2026', 'August 31, 2026']);

        $this->assertStringContainsString('from 9:30 AM to 11:00 AM at ISGL.<br>', $html);
        $this->assertStringContainsString('available.<br>', $html);
        $this->assertStringContainsString('<strong>You must re-enroll Student Name before the make-up exam can be taken.</strong>', $html);
        $this->assertStringNotContainsString('before they are permitted', $html);
    }

    public function testFinancialSectionShowsWhenAnyAmountIsDue(): void
    {
        $service = $this->service();

        $html = $this->invoke($service, 'financialSection', [10, [
            'registration_fee' => 25,
            'tuition_due_at_registration' => 10,
            'mandatory_fees' => 5,
        ], null]);

        $this->assertStringContainsString('Family Account Information', $html);
        $this->assertStringContainsString('Carry-over balance:</strong> $0.00', $html);
        $this->assertStringContainsString('Total currently due:</strong> $40.00', $html);
        $this->assertStringNotContainsString('Registration fee:', $html);
        $this->assertStringNotContainsString('New-year tuition due now:', $html);
        $this->assertStringNotContainsString('Mandatory fees:', $html);
    }

    public function testAutomaticDistributionPlacementShowsOnlyGrade(): void
    {
        $service = $this->service();

        $placement = $this->invoke($service, 'placementText', [[
            'placement_status' => 'automatic_distribution_pending',
            'assigned_grade_name' => '9',
        ]]);

        $this->assertSame('Grade 9', $placement);
    }

    public function testStudentSummaryUsesStackedEmailRows(): void
    {
        $service = $this->service();

        $html = $this->invoke($service, 'studentRow', [[
            'firstname' => 'Test',
            'lastname' => 'Student',
        ], [
            'deliberation_decision' => DeliberationDecision::PASSED,
            'placement_status' => 'automatic_distribution_pending',
            'source_grade_name' => '4',
            'assigned_grade_name' => '5',
            'blockers' => [],
        ], 'August 1, 2026', 'August 31, 2026']);

        $this->assertStringContainsString('role="presentation"', $html);
        $this->assertStringContainsString('Decision', $html);
        $this->assertStringContainsString('Registration Status', $html);
        $this->assertStringContainsString('Next Step', $html);
        $this->assertStringContainsString('word-break:break-word', $html);
        $this->assertStringNotContainsString('</td><td', $html);
    }

    public function testStudentsTableWrapsStackedStudentBlocks(): void
    {
        $service = $this->service();

        $html = $this->invoke($service, 'studentsTable', [['<table role="presentation"></table>']]);

        $this->assertStringStartsWith('<div style="margin:12px 0 18px;">', $html);
        $this->assertStringContainsString('<table role="presentation"></table>', $html);
        $this->assertStringEndsWith('</div>', $html);
    }

    public function testRegistrationStepsSectionIsHiddenWhenNoStudentCanReEnroll(): void
    {
        $service = $this->service();

        $html = $this->invoke($service, 'registrationStepsSection', ['August 1, 2026', 'August 31, 2026', false]);

        $this->assertSame('', $html);
    }

    public function testRegistrationStepsSectionShowsWhenAnyStudentCanReEnroll(): void
    {
        $service = $this->service();

        $html = $this->invoke($service, 'registrationStepsSection', ['August 1, 2026', 'August 31, 2026', true]);

        $this->assertStringContainsString('Re-enrollment Steps', $html);
        $this->assertStringContainsString('Sign in to the parent portal.', $html);
        $this->assertStringContainsString('parent/enroll_classes', $html);
    }

    public function testStudentIssueCodeUsesFlagRuleCode(): void
    {
        $service = $this->service();

        $code = $this->invoke($service, 'studentIssueCode', [[
            'flags' => [[
                'flag_type' => 'DEFERRED_DELIBERATION',
                'details' => ['rule_code' => 'NO_FINAL_DECISION'],
            ]],
        ]]);

        $this->assertSame('NO_FINAL_DECISION', $code);
    }

    public function testStudentIssueCodeDoesNotColorNormalDecision(): void
    {
        $service = $this->service();

        $code = $this->invoke($service, 'studentIssueCode', [[
            'can_enroll' => true,
            'deliberation_decision' => DeliberationDecision::PASSED,
            'flags' => [],
        ]]);

        $this->assertSame('', $code);
    }

    public function testParentReEnrollmentEligibilityUsesTransitionAllowedFlag(): void
    {
        $service = $this->service();

        $this->assertTrue($this->invoke($service, 'canCompleteParentReEnrollment', [[
            'parent_enrollment_allowed' => true,
            'blockers' => [],
        ]]));

        $this->assertFalse($this->invoke($service, 'canCompleteParentReEnrollment', [[
            'parent_enrollment_allowed' => false,
            'blockers' => ['Contact administration.'],
        ]]));
    }

    public function testForceCannotSendWithoutAdminLaunchApproval(): void
    {
        $emailService = $this->createMock(EmailService::class);
        $emailService->expects($this->never())->method('send');
        $service = $this->service($this->dbWithNoRecipientFamilies(), $emailService);

        $summary = $service->sendForSchoolYear([
            'name' => '2026-2027',
            'registration_launch_approved_at' => null,
        ], null, false, true);

        $this->assertSame(0, $summary['sent']);
        $this->assertSame(1, $summary['skipped']);
        $this->assertStringContainsString('not approved', implode(' ', $summary['messages']));
    }

    public function testFailedOnlyRetryUsesLatestFailedEmailRecordPerParent(): void
    {
        $query = new class {
            public function getResultArray(): array
            {
                return [
                    ['parent_user_id' => 10, 'delivery_status' => 'failed'],
                    ['parent_user_id' => 10, 'delivery_status' => 'sent'],
                    ['parent_user_id' => 20, 'delivery_status' => 'sent'],
                    ['parent_user_id' => 20, 'delivery_status' => 'failed'],
                    ['parent_user_id' => 30, 'delivery_status' => 'failed'],
                    ['parent_user_id' => null, 'delivery_status' => 'failed'],
                ];
            }
        };

        $builder = $this->createMock(BaseBuilder::class);
        $builder->method('select')->willReturnSelf();
        $builder->method('where')->with('school_year', '2026-2027')->willReturnSelf();
        $builder->method('orderBy')->willReturnSelf();
        $builder->method('get')->willReturn($query);

        $db = $this->createMock(BaseConnection::class);
        $db->method('tableExists')->with('enrollment_email_records')->willReturn(true);
        $db->method('table')->with('enrollment_email_records')->willReturn($builder);

        $service = $this->service($db);

        $this->assertSame([10, 30], $this->invoke($service, 'failedParentIdsForSchoolYear', ['2026-2027']));
    }

    /**
     * @param list<mixed> $args
     */
    private function invoke(EnrollmentRegistrationEmailService $service, string $method, array $args): mixed
    {
        $reflection = new \ReflectionMethod($service, $method);
        $reflection->setAccessible(true);

        return $reflection->invokeArgs($service, $args);
    }

    private function service(?BaseConnection $db = null, ?EmailService $emailService = null, ?ConfigurationModel $configModel = null): EnrollmentRegistrationEmailService
    {
        $db ??= $this->createMock(BaseConnection::class);

        return new EnrollmentRegistrationEmailService(
            $db,
            new EnrollmentTransitionService($db),
            $emailService ?? $this->createMock(EmailService::class),
            $configModel,
        );
    }

    private function dbWithNoRecipientFamilies(): BaseConnection
    {
        $query = new class {
            public function getResultArray(): array
            {
                return [];
            }
        };

        $builder = $this->createMock(BaseBuilder::class);
        $builder->method('select')->willReturnSelf();
        $builder->method('where')->willReturnSelf();
        $builder->method('get')->willReturn($query);

        $db = $this->createMock(BaseConnection::class);
        $db->method('table')->willReturn($builder);
        $db->method('fieldExists')->with('user_type', 'users')->willReturn(false);

        return $db;
    }
}