<?php
session_start();

require_once __DIR__ . '/../ai/LocalAIApi.php';

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

if (!isset($_SESSION['user_id'])) {
    echo json_encode(['error' => 'User not logged in']);
    exit;
}

$moodText = isset($_POST['mood_text']) ? trim($_POST['mood_text']) : '';

if (empty($moodText)) {
    echo json_encode(['error' => 'Mood text cannot be empty']);
    exit;
}

$musicDatabase = [
    'happy' => [['videoId' => 'y6Sxv-sUYtM', 'title' => 'Pharrell Williams - Happy'], ['videoId' => 'HgzGwKwLmgM', 'title' => 'Queen - Don\'t Stop Me Now'], ['videoId' => 'iPUmE-tne5s', 'title' => 'Katrina & The Waves - Walking On Sunshine']],
    'sad' => [['videoId' => 'hLQl3WQQoQ0', 'title' => 'Adele - Someone Like You'], ['videoId' => '8AHCfZTRGiI', 'title' => 'Johnny Cash - Hurt'], ['videoId' => 'XFkzRNyygfk', 'title' => 'Radiohead - Creep']],
    'energetic' => [['videoId' => 'v2AC41dglnM', 'title' => 'AC/DC - Thunderstruck'], ['videoId' => 'o1tj2zJ2Wvg', 'title' => 'Guns N\' Roses - Welcome to the Jungle'], ['videoId' => 'CD-E-LDc384', 'title' => 'Metallica - Enter Sandman']],
    'calm' => [['videoId' => 'vNwYtllyt3Q', 'title' => 'Brian Eno - Music for Airports 1/1'], ['videoId' => 'S-Xm7s9eGxU', 'title' => 'Erik Satie - Gymnopédie No. 1'], ['videoId' => 'U3u4pQ44e14', 'title' => 'Claude Debussy - Clair de Lune']],
    'upbeat' => [['videoId' => 'FGBhQbmPwH8', 'title' => 'Daft Punk - One More Time'], ['videoId' => 'sy1dYFGkPUE', 'title' => 'Justice - D.A.N.C.E.'], ['videoId' => 'Cj8JrQ9w5jY', 'title' => 'LCD Soundsystem - Daft Punk Is Playing at My House']]
];

$prompt = 'Based on the following text, what is the primary mood? Please respond with only one of the following words: happy, sad, energetic, calm, upbeat. Text: ' . $moodText;

$resp = LocalAIApi::createResponse([
    'input' => [
        ['role' => 'system', 'content' => 'You are a mood detection assistant.'],
        ['role' => 'user', 'content' => $prompt],
    ],
]);

if (!empty($resp['success'])) {
    $decoded = LocalAIApi::decodeJsonFromResponse($resp);
    $aiReply = $decoded['choices'][0]['message']['content'] ?? '';
    $mood = trim(strtolower($aiReply));

    if (array_key_exists($mood, $musicDatabase)) {
        $songs = $musicDatabase[$mood];
        echo json_encode(['mood' => $mood, 'songs' => $songs]);
    } else {
        // Fallback to a random mood if the AI response is not a valid key
        $randomMood = array_rand($musicDatabase);
        $songs = $musicDatabase[$randomMood];
        echo json_encode(['mood' => $randomMood, 'songs' => $songs]);
    }
} else {
    // Fallback to a random mood if the AI call fails
    $randomMood = array_rand($musicDatabase);
    $songs = $musicDatabase[$randomMood];
    echo json_encode(['mood' => $randomMood, 'songs' => $songs]);
}