<?php

namespace Tests\Unit;

use App\Models\ReminderMailConfigModel;
use CodeIgniter\Test\CIUnitTestCase;

class ReminderMailConfigModelTest extends CIUnitTestCase
{
    private ReminderMailConfigModel $model;

    protected function setUp(): void
    {
        parent::setUp();
        $this->model = new ReminderMailConfigModel();
    }

    public function testHasCustomTemplateRequiresBothSubjectAndBody()
    {
        $this->assertFalse($this->model->hasCustomTemplate(null));
        $this->assertFalse($this->model->hasCustomTemplate([]));
        $this->assertFalse($this->model->hasCustomTemplate([
            'email_subject' => 'Reminder',
            'email_body'    => '',
        ]));
        $this->assertFalse($this->model->hasCustomTemplate([
            'email_subject' => '   ',
            'email_body'    => '<p>Body</p>',
        ]));
        $this->assertTrue($this->model->hasCustomTemplate([
            'email_subject' => 'Reminder',
            'email_body'    => '<p>Body</p>',
        ]));
    }

    public function testResolveNotificationTemplateUsesCustomTemplateWhenConfigured()
    {
        $config = [
            'email_subject' => 'Custom subject',
            'email_body'    => '<p>Custom body</p>',
        ];

        $notification = [
            'id'           => 5,
            'enabled'      => 0,
            'subject'      => 'Default subject',
            'mail_content' => '<p>Default body</p>',
        ];

        $resolved = $this->model->resolveNotificationTemplate($config, $notification);

        $this->assertSame('Custom subject', $resolved['subject']);
        $this->assertSame('<p>Custom body</p>', $resolved['mail_content']);
        $this->assertSame(1, $resolved['enabled']);
        $this->assertSame(5, $resolved['id']);
    }

    public function testResolveNotificationTemplateReturnsDefaultWhenCustomTemplateMissing()
    {
        $notification = [
            'subject'      => 'Default subject',
            'mail_content' => '<p>Default body</p>',
        ];

        $resolved = $this->model->resolveNotificationTemplate(
            ['email_subject' => 'Only subject'],
            $notification
        );

        $this->assertSame($notification, $resolved);
    }

    public function testCanSendReminderMailAllowsCustomTemplateEvenWhenNotificationDisabled()
    {
        $config = [
            'email_subject' => 'Custom subject',
            'email_body'    => '<p>Custom body</p>',
        ];

        $notification = [
            'enabled'      => 0,
            'mail_content' => '',
        ];

        $this->assertTrue($this->model->canSendReminderMail($config, $notification));
    }

    public function testCanSendReminderMailRequiresEnabledDefaultNotification()
    {
        $this->assertFalse($this->model->canSendReminderMail(null, null));
        $this->assertFalse($this->model->canSendReminderMail(null, [
            'enabled'      => 0,
            'mail_content' => '<p>Body</p>',
        ]));
        $this->assertFalse($this->model->canSendReminderMail(null, [
            'enabled'      => 1,
            'mail_content' => '',
        ]));
        $this->assertTrue($this->model->canSendReminderMail(null, [
            'enabled'      => 1,
            'mail_content' => '<p>Body</p>',
        ]));
    }

    public function testValidateConfigRejectsInvalidFrequency()
    {
        $error = $this->model->validateConfig('hourly', '1');

        $this->assertSame(
            'Invalid frequency. Allowed values: daily, weekly, monthly, custom, working_days.',
            $error
        );
    }

    public function testValidateConfigDailyDoesNotRequireReminderDays()
    {
        $this->assertNull($this->model->validateConfig(
            ReminderMailConfigModel::FREQUENCY_DAILY,
            null
        ));
    }

    public function testValidateConfigWorkingDaysAcceptsDayNames()
    {
        $this->assertNull($this->model->validateConfig(
            ReminderMailConfigModel::FREQUENCY_WORKING_DAYS,
            'Mon,Wed,Fri'
        ));
    }

    public function testValidateConfigWeeklyRejectsInvalidDay()
    {
        $error = $this->model->validateConfig(
            ReminderMailConfigModel::FREQUENCY_WEEKLY,
            '0,8'
        );

        $this->assertSame(
            'Weekly reminder_days must be between 0 (Sunday) and 6 (Saturday).',
            $error
        );
    }

    public function testEnrichConfigAddsCustomTemplateFlagAndWorkingDayLabels()
    {
        $config = $this->model->enrichConfig([
            'frequency'     => ReminderMailConfigModel::FREQUENCY_WORKING_DAYS,
            'reminder_days' => '1,3,5',
            'email_subject' => 'Reminder',
            'email_body'    => '<p>Please enroll</p>',
        ]);

        $this->assertTrue($config['has_custom_template']);
        $this->assertSame(['Mon', 'Wed', 'Fri'], $config['working_day_labels']);
    }

    public function testNormalizeWorkingDaysSortsAndDeduplicates()
    {
        $this->assertSame('1,3,5', $this->model->normalizeWorkingDays('Fri,Mon,Wed,Mon'));
    }
}