<?php

namespace App\Services\JobApi\Transformers;

use App\Services\JobApi\DTO\JobData;
use App\Services\JobApi\Exceptions\TransformationException;
use DateTime;

class RemotiveTransformer implements JobTransformer
{
    public function transform(array $data): JobData
    {
        try {
            return new JobData(
                externalId: (string) $data['id'],
                title: $data['title'] ?? 'Untitled',
                company: $data['company_name'] ?? 'Unknown Company',
                description: $this->sanitizeDescription($data['description'] ?? ''),
                location: $this->parseLocation($data),
                salaryMin: $this->parseSalary($data['salary'] ?? null, 'min'),
                salaryMax: $this->parseSalary($data['salary'] ?? null, 'max'),
                salaryCurrency: 'USD',
                jobType: $this->mapJobType($data['job_type'] ?? null),
                sourceUrl: $data['url'] ?? null,
                applyUrl: $data['url'] ?? null,
                postedAt: $this->parseDate($data['publication_date'] ?? null),
                expiresAt: null,
                remoteAllowed: true, // Remotive only has remote jobs
                experienceLevel: $this->mapExperienceLevel($data['candidate_required_location'] ?? null),
                category: $data['category'] ?? null,
                rawData: $data,
            );
        } catch (\Throwable $e) {
            throw new TransformationException(
                'Remotive',
                'Failed to transform Remotive job data: ' . $e->getMessage(),
                ['data' => $data, 'error' => $e->getMessage()]
            );
        }
    }

    public function transformMany(array $jobs): array
    {
        return array_map(fn($job) => $this->transform($job), $jobs);
    }

    private function sanitizeDescription(string $description): string
    {
        // Remove HTML tags and clean up whitespace
        $clean = strip_tags($description);
        $clean = html_entity_decode($clean, ENT_QUOTES | ENT_HTML5, 'UTF-8');
        $clean = preg_replace('/\s+/', ' ', $clean);
        return trim($clean);
    }

    private function parseLocation(array $data): ?string
    {
        $location = $data['candidate_required_location'] ?? null;

        if (empty($location)) {
            return 'Remote';
        }

        return $location;
    }

    private function parseSalary(?string $salary, string $type): ?float
    {
        if (empty($salary)) {
            return null;
        }

        // Try to extract numbers from salary string
        if (preg_match_all('/[\d,]+/', $salary, $matches)) {
            $numbers = array_map(fn($n) => (float) str_replace(',', '', $n), $matches[0]);

            if (count($numbers) >= 2) {
                return $type === 'min' ? min($numbers) : max($numbers);
            } elseif (count($numbers) === 1) {
                return $numbers[0];
            }
        }

        return null;
    }

    private function parseDate(?string $date): ?DateTime
    {
        if (empty($date)) {
            return null;
        }

        try {
            return new DateTime($date);
        } catch (\Exception $e) {
            return null;
        }
    }

    private function mapJobType(?string $type): ?string
    {
        if (empty($type)) {
            return 'full-time';
        }

        return match (strtolower($type)) {
            'full_time', 'full-time' => 'full-time',
            'part_time', 'part-time' => 'part-time',
            'contract' => 'contract',
            'freelance' => 'freelance',
            default => 'full-time',
        };
    }

    private function mapExperienceLevel(?string $location): ?string
    {
        // Remotive doesn't provide experience level directly
        // This is a placeholder that could be enhanced with ML/NLP
        return null;
    }
}