<?php

namespace OxSama;

class About extends Me implements \JsonSerializable
{
    private const GITHUB_URL = 'https://github.com/OxSama';
    private const LINKEDIN_URL = 'https://www.linkedin.com/in/oxsama/';

    public function whoami(): array
    {
        return [
            'name' => 'Mohammed Tag Eldin Ali',
            'title' => 'Senior Software Engineer',
            'location' => 'UAE',
        ];
    }

    public function getCurrentWorkplace(): array
    {
        return [
            'company' => 'Polaris Technology LLC',
            'position' => 'Senior Software Engineer',
            'duration' => $this->calculateDuration('2024-07'),
            'responsibilities' => [
                'Developing enterprise applications',
                'Code review',
                'Implementing secure development practices',
            ]
        ];
    }

    public function getPreviousWorkplaces(): array
    {
        return [
            [
                'company' => 'Maxnet Digital Services',
                'position' => 'Software Engineer',
                'duration' => '2022-2023',
                'highlights' => [
                    'Developed and maintained multiple web applications',
                    'Implemented automated testing practices',
                    'Collaborated with the Sudanese banks on payment and digital transformation solutions',
                ]
            ],
            [
                'company' => 'Nile University',
                'position' => 'Teaching Assistant',
                'duration' => '2022-2023',
                'highlights' => ['Taught programming fundamentals and provided mentorship to students']
            ],
            [
                'company' => 'Sudan University For Science & Technology',
                'position' => 'Teaching Assistant',
                'duration' => '2022-2023',
                'highlights' => ['Assisted in teaching computer science courses and labs']
            ]
        ];
    }

    public function getTechnicalSkills(): array
    {
        return [
            'languages' => [
                'PHP' => ['Laravel'],
                'JavaScript' => ['React', 'Vue.js', 'Node.js'],
                'Java' => ['Spring Boot'],
                'Dart' => ['Flutter'],
                'Python' => ['Django']
            ],
            'databases' => [
                'MySQL',
                'PostgreSQL',
                'MongoDB',
                'Redis'
            ],
            'devops' => [
                'Docker',
                'GitHub Actions'
            ],
            'tools' => [
                'Git',
                'Linux',
                'Apache'
            ]
        ];
    }

    public function getExpertise(): array
    {
        return [
            'Backend Development' => [
                'RESTful APIs',
                'Microservices',
                'Database Design',
                'Performance Optimization',
                'Secure Development Practices',
            ],
            'Frontend Development' => [
                'SPA Architecture',
                'State Management',
                'UI/UX Implementation'
            ],
            'DevOps' => [
                'CI/CD Pipeline Setup',
                'Server Configuration',
                'Monitoring & Logging'
            ]
        ];
    }

    public function getEducation(): array
    {
        return [
            [
                'degree' => 'Bachelor of Science in Computer Science',
                'university' => 'Sudan University For Science & Technology',
                'year' => '2022',
                'achievements' => [
                    'First Class Honours'
                ]
            ]
        ];
    }

    public function getContactInfo(): array
    {
        return [
            'email' => '[email protected]',
            'linkedin' => self::LINKEDIN_URL,
            'github' => self::GITHUB_URL
        ];
    }

    private function calculateDuration(string $startDate): string
    {
        $start = new \DateTime($startDate);
        $now = new \DateTime();
        $interval = $start->diff($now);

        $years = $interval->y;
        $months = $interval->m;

        if ($years > 0) {
            return sprintf('%d year%s %d month%s',
                $years,
                $years > 1 ? 's' : '',
                $months,
                $months > 1 ? 's' : ''
            );
        }

        return sprintf('%d month%s', $months, $months > 1 ? 's' : '');
    }

    public function jsonSerialize(): array
    {
        return [
            'about' => $this->whoami(),
            'current_workplace' => $this->getCurrentWorkplace(),
            'previous_workplaces' => $this->getPreviousWorkplaces(),
            'technical_skills' => $this->getTechnicalSkills(),
            'expertise' => $this->getExpertise(),
            'education' => $this->getEducation(),
            'contact' => $this->getContactInfo()
        ];
    }
}