<?php

function calculate_achievements_score($resume) {
    $keywords = ['achieved', 'accomplished', 'awarded', 'gained', 'increased', 'decreased', 'optimized'];
    $score = 0;
    foreach ($keywords as $keyword) {
        if (stripos($resume, $keyword) !== false) {
            $score += 5;
        }
    }
    return min($score, 30);
}

function calculate_duration_score($resume) {
    $keywords = ['years', 'months', 'jan', 'feb', 'mar', 'apr', 'may', 'jun', 'jul', 'aug', 'sep', 'oct', 'nov', 'dec'];
    $score = 0;
    foreach ($keywords as $keyword) {
        if (stripos($resume, $keyword) !== false) {
            $score += 2;
        }
    }
    return min($score, 20);
}

function calculate_skills_score($resume) {
    $skills = ['php', 'javascript', 'python', 'java', 'c++', 'sql', 'html', 'css', 'react', 'angular', 'vue', 'node.js', 'aws', 'azure', 'gcp'];
    $score = 0;
    foreach ($skills as $skill) {
        if (stripos($resume, $skill) !== false) {
            $score += 2;
        }
    }
    return min($score, 20);
}

function calculate_courses_score($resume) {
    $keywords = ['course', 'certification', 'training', 'workshop'];
    $score = 0;
    foreach ($keywords as $keyword) {
        if (stripos($resume, $keyword) !== false) {
            $score += 5;
        }
    }
    return min($score, 15);
}

function calculate_project_quality_score($resume) {
    $keywords = ['deployed', 'live', 'production', 'github', 'portfolio', 'demo'];
    $score = 0;
    foreach ($keywords as $keyword) {
        if (stripos($resume, $keyword) !== false) {
            $score += 3;
        }
    }
    return min($score, 15);
}

function calculate_impact_score($resume) {
    $action_verbs = ['managed', 'led', 'developed', 'created', 'implemented', 'designed', 'analyzed', 'negotiated', 'achieved', 'accomplished', 'awarded', 'gained', 'increased', 'decreased', 'optimized'];
    $action_verb_score = 0;
    foreach ($action_verbs as $verb) {
        $action_verb_score += substr_count(strtolower($resume), $verb);
    }
    $action_verb_score *= 2;

    $quantifiable_results_score = 0;
    preg_match_all('/\d+/?%?/', $resume, $matches);
    $quantifiable_results_score = count($matches[0]) * 5;

    $specific_achievements = ['award', 'promotion', 'led', 'managed', 'developed', 'created'];
    $specific_achievements_score = 0;
    foreach ($specific_achievements as $achievement) {
        $specific_achievements_score += substr_count(strtolower($resume), $achievement);
    }
    $specific_achievements_score *= 3;

    $total_score = $action_verb_score + $quantifiable_results_score + $specific_achievements_score;
    return min($total_score, 100);
}

function detect_fake_content($resume) {
    $flags = [];

    $generic_phrases = ['team player', 'hard worker', 'results-oriented', 'good communication skills', 'detail-oriented'];
    foreach ($generic_phrases as $phrase) {
        if (stripos($resume, $phrase) !== false) {
            $flags[] = 'Generic phrase found: "' . $phrase . '"';
        }
    }

    $buzzwords = ['synergy', 'disruptive', 'paradigm shift', 'rockstar', 'ninja'];
    foreach ($buzzwords as $word) {
        if (stripos($resume, $word) !== false) {
            $flags[] = 'Buzzword found: "' . $word . '"';
        }
    }

    // Very basic check for overlapping dates - this is a simplified example
    preg_match_all('/(\d{4})\s*-\s*(\d{4})/', $resume, $matches, PREG_SET_ORDER);
    $dates = [];
    foreach ($matches as $match) {
        $dates[] = ['start' => (int)$match[1], 'end' => (int)$match[2]];
    }

    for ($i = 0; $i < count($dates); $i++) {
        for ($j = $i + 1; $j < count($dates); $j++) {
            if ($dates[$i]['start'] < $dates[$j]['end'] && $dates[$j]['start'] < $dates[$i]['end']) {
                $flags[] = 'Potential overlapping dates found.';
                break 2;
            }
        }
    }

    return $flags;
}

function get_role_based_suggestions($resume, $role) {
    $role_keywords = [
        'software engineer' => ['php', 'javascript', 'python', 'java', 'c++', 'sql', 'html', 'css', 'react', 'angular', 'vue', 'node.js', 'aws', 'azure', 'gcp', 'docker', 'kubernetes', 'git'],
        'product manager' => ['agile', 'scrum', 'roadmap', 'user stories', 'market research', 'competitive analysis', 'product launch', 'kpis', 'user feedback', 'a/b testing'],
        'data scientist' => ['python', 'r', 'sql', 'machine learning', 'deep learning', 'tensorflow', 'pytorch', 'scikit-learn', 'pandas', 'numpy', 'data visualization', 'statistics']
    ];

    $suggestions = [];

    if (isset($role_keywords[$role])) {
        $resume_words = str_word_count(strtolower($resume), 1);
        $missing_keywords = array_diff($role_keywords[$role], $resume_words);

        if (!empty($missing_keywords)) {
            $suggestions['add'] = $missing_keywords;
        }
    } else {
        $suggestions['error'] = 'Role not found. Please try one of the following: Software Engineer, Product Manager, Data Scientist.';
    }

    return $suggestions;
}