<?php
session_start();

require_once __DIR__ . '/../includes/gemini.php';

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $apiKey = getenv('GEMINI_API_KEY');
    if (!$apiKey) {
        header('Content-Type: application/json');
        http_response_code(500);
        echo json_encode(['success' => false, 'message' => 'API key is not configured.']);
        exit;
    }

    $request_body = file_get_contents('php://input');
    $form_data = json_decode($request_body, true);

    // --- PROMPT ENGINEERING --- //
    $prompt = "Please generate a professional resume based on the following details. Format the output as clean, semantic HTML suitable for direct display on a web page. The design should be modern and professional. Use a single-column layout. Do not include any CSS or ```html markers, only the raw HTML body content.";
    $prompt .= "\n\n---\n\n";

    // Personal Details
    $prompt .= "**Personal Details:**\n";
    $prompt .= "- Name: " . ($form_data['fullName'] ?? 'N/A') . "\n";
    $prompt .= "- Email: " . ($form_data['email'] ?? 'N/A') . "\n";
    $prompt .= "- Phone: " . ($form_data['phone'] ?? 'N/A') . "\n";
    $prompt .= "- LinkedIn: " . ($form_data['linkedin'] ?? 'N/A') . "\n\n";

    // Summary
    if (!empty($form_data['summary'])) {
        $prompt .= "**Professional Summary:**\n" . $form_data['summary'] . "\n\n";
    }

    // Work Experience
    if (!empty($form_data['experience'])) {
        $prompt .= "**Work Experience:**\n";
        foreach ($form_data['experience'] as $exp) {
            $prompt .= "- Job Title: " . ($exp['title'] ?? 'N/A') . " at " . ($exp['company'] ?? 'N/A') . "\n";
            $prompt .= "  (From: " . ($exp['startDate'] ?? 'N/A') . " to " . ($exp['endDate'] ?? 'Present') . ")\n";
            if (!empty($exp['responsibilities'])) {
                $prompt .= "  Responsibilities: " . $exp['responsibilities'] . "\n";
            }
        }
        $prompt .= "\n";
    }

    // Education
    if (!empty($form_data['education'])) {
        $prompt .= "**Education:**\n";
        foreach ($form_data['education'] as $edu) {
            $prompt .= "- Degree: " . ($edu['degree'] ?? 'N/A') . " from " . ($edu['school'] ?? 'N/A') . "\n";
            $prompt .= "  (From: " . ($edu['startDate'] ?? 'N/A') . " to " . ($edu['endDate'] ?? 'Present') . ")\n";
        }
        $prompt .= "\n";
    }

    // Skills
    if (!empty($form_data['skills'])) {
        $prompt .= "**Skills:**\n" . $form_data['skills'] . "\n";
    }

    // Call the Gemini API
    $api_response = callGeminiApi($prompt, $apiKey);

    header('Content-Type: application/json');

    if (isset($api_response['error'])) {
        http_response_code(500);
        echo json_encode(['success' => false, 'message' => $api_response['error'], 'details' => $api_response['response'] ?? null]);
        exit;
    }

    $_SESSION['generated_resume'] = $api_response['html'];
    $_SESSION['resume_prompt'] = $prompt; // Storing for debug or retry purposes

    echo json_encode(['success' => true, 'message' => 'Resume generated successfully.']);

} else {
    header('HTTP/1.1 405 Method Not Allowed');
    echo json_encode(['success' => false, 'message' => 'Invalid request method.']);
}