<?php
/**
 * API Monitoring - Backend for Arduino ESP32 Component Monitoring
 * Endpoints:
 *   GET  ?action=status       → Get all component statuses with extra data
 *   POST ?action=update       → Update a component from Arduino/ESP32
 *   GET  ?action=history&id=X → Get history for a specific component
 *   POST ?action=bulk_update  → Update multiple components at once
 */

header('Content-Type: application/json');
header('Access-Control-Allow-Origin: *');
header('Access-Control-Allow-Methods: GET, POST, OPTIONS');
header('Access-Control-Allow-Headers: Content-Type');

if ($_SERVER['REQUEST_METHOD'] === 'OPTIONS') { http_response_code(200); exit; }

include 'koneksi.php';

// ─── Create tables ──────────────────────────────────────────────────────────
$pdo->exec("
CREATE TABLE IF NOT EXISTS monitoring_components (
    id INT AUTO_INCREMENT PRIMARY KEY,
    component_key VARCHAR(50) UNIQUE NOT NULL,
    component_name VARCHAR(100) NOT NULL,
    component_type VARCHAR(50) NOT NULL DEFAULT 'sensor',
    status ENUM('online','offline','warning','error') DEFAULT 'offline',
    value VARCHAR(100) DEFAULT NULL,
    unit VARCHAR(20) DEFAULT NULL,
    icon VARCHAR(50) DEFAULT 'mdi-chip',
    color VARCHAR(20) DEFAULT '#4B49AC',
    image VARCHAR(100) DEFAULT NULL,
    extra_data JSON DEFAULT NULL,
    last_seen DATETIME DEFAULT NULL,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4
");

$pdo->exec("
CREATE TABLE IF NOT EXISTS monitoring_history (
    id INT AUTO_INCREMENT PRIMARY KEY,
    component_id INT NOT NULL,
    value VARCHAR(100) DEFAULT NULL,
    status ENUM('online','offline','warning','error') DEFAULT 'online',
    recorded_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (component_id) REFERENCES monitoring_components(id) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4
");

// ─── Ensure columns exist ───────────────────────────────────────────────────
try { $pdo->query("SELECT extra_data FROM monitoring_components LIMIT 1"); } catch (Exception $e) {
    $pdo->exec("ALTER TABLE monitoring_components ADD COLUMN extra_data JSON DEFAULT NULL");
}
try { $pdo->query("SELECT image FROM monitoring_components LIMIT 1"); } catch (Exception $e) {
    $pdo->exec("ALTER TABLE monitoring_components ADD COLUMN image VARCHAR(100) DEFAULT NULL");
}

// ─── Seed defaults ──────────────────────────────────────────────────────────
$count = $pdo->query("SELECT COUNT(*) FROM monitoring_components")->fetchColumn();
if ($count == 0) {
    $defaults = [
        ['esp32', 'Mikrokontroler ESP32', 'controller', 'offline', null, null,
         'mdi-developer-board', '#4B49AC', 'esp32.jpeg',
         json_encode(['wifi_status'=>'off','wifi_rssi'=>'0','wifi_ssid'=>'','wifi_ip'=>'',
                      'bluetooth'=>'off','cpu_freq'=>'240','free_heap'=>'0',
                      'uptime'=>'0','temperature'=>'0','voltage_in'=>'0'])],

        ['fingerprint', 'Sensor Sidik Jari AS608', 'sensor', 'offline', null, null,
         'mdi-fingerprint', '#F3797E', 'as608.jpeg',
         json_encode(['sensor_state'=>'ready','enrolled_count'=>'0',
                      'last_scan_result'=>'none','confidence'=>'0','last_matched_id'=>''])],

        ['tft_screen', 'Layar TFT Touch Screen ILI9488', 'display', 'offline', null, null,
         'mdi-monitor', '#7DA0FA', 'ili9488.jpg',
         json_encode(['display_state'=>'active','current_page'=>'Halaman Standby',
                      'brightness'=>'100','touch_enabled'=>'yes','resolution'=>'480x320'])],

        ['relay', 'Modul Relay 5V 1 Channel', 'actuator', 'offline', null, null,
         'mdi-electric-switch', '#7978E9', 'relay.png',
         json_encode(['relay_state'=>'off','circuit_connected'=>'no','trigger_count'=>'0'])],

        ['solenoid_lock', 'Solenoid Door Lock NC 12V', 'actuator', 'offline', null, null,
         'mdi-lock', '#E74C3C', 'solenoid.jpg',
         json_encode(['lock_state'=>'locked','voltage'=>'0','power_watts'=>'0',
                      'open_count'=>'0','last_opened'=>''])],

        ['buzzer', 'Buzzer', 'actuator', 'offline', null, null,
         'mdi-volume-high', '#4ECDC4', 'buzzer.jpeg',
         json_encode(['buzzer_state'=>'silent','last_tone'=>'none','beep_count'=>'0'])],

        ['led_red', 'LED Indikator Merah', 'indicator', 'offline', null, null,
         'mdi-led-on', '#FF6B6B', 'led_red.png',
         json_encode(['led_state'=>'off','blink_mode'=>'none','brightness'=>'0'])],

        ['led_green', 'LED Indikator Hijau', 'indicator', 'offline', null, null,
         'mdi-led-on', '#51CF66', 'led_green.png',
         json_encode(['led_state'=>'off','blink_mode'=>'none','brightness'=>'0'])],

        ['power_supply', 'Adaptor Power Supply 12V', 'power', 'offline', '0', 'V',
         'mdi-power-plug', '#FFA726', 'power_supply.png',
         json_encode(['voltage_in'=>'0','voltage_out'=>'0','current_out'=>'0',
                      'power_watts'=>'0'])],

        ['step_down', 'Step Down 12V ke 5V LM2596', 'power', 'offline', '0', 'V',
         'mdi-arrow-down-bold', '#7DA0FA', 'step_down.png',
         json_encode(['state'=>'active','voltage_in'=>'0','voltage_out'=>'0',
                      'current_out'=>'0','power_watts'=>'0','temperature'=>'0','efficiency'=>'0'])],

        ['battery', 'Baterai Li-ion 18650', 'power', 'offline', '0', '%',
         'mdi-battery', '#66BB6A', 'battery.png',
         json_encode(['bat_state'=>'standby','voltage'=>'0','charge_percent'=>'0',
                      'current'=>'0','power_watts'=>'0','temperature'=>'0'])],
    ];

    $stmt = $pdo->prepare("INSERT INTO monitoring_components
        (component_key,component_name,component_type,status,value,unit,icon,color,image,extra_data)
        VALUES (?,?,?,?,?,?,?,?,?,?)");
    foreach ($defaults as $d) $stmt->execute($d);
}

// ─── Router ─────────────────────────────────────────────────────────────────
$action = $_GET['action'] ?? '';

switch ($action) {

    case 'status':
        $rows = $pdo->query("
            SELECT *, TIMESTAMPDIFF(SECOND, last_seen, NOW()) as seconds_ago
            FROM monitoring_components
            ORDER BY FIELD(component_type,'controller','sensor','display','actuator','indicator','power'), id
        ")->fetchAll();

        foreach ($rows as &$r) {
            if ($r['last_seen'] && $r['seconds_ago'] > 30 && $r['status'] === 'online') {
                $pdo->prepare("UPDATE monitoring_components SET status='offline' WHERE id=?")->execute([$r['id']]);
                $r['status'] = 'offline';
            }
            if (isset($r['extra_data']) && is_string($r['extra_data']))
                $r['extra_data'] = json_decode($r['extra_data'], true);
        }

        $online  = count(array_filter($rows, fn($r) => $r['status'] === 'online'));
        $warning = count(array_filter($rows, fn($r) => $r['status'] === 'warning'));
        $error   = count(array_filter($rows, fn($r) => $r['status'] === 'error'));
        $offline = count(array_filter($rows, fn($r) => $r['status'] === 'offline'));

        echo json_encode([
            'success' => true, 'data' => $rows,
            'summary' => ['total'=>count($rows),'online'=>$online,'warning'=>$warning,'error'=>$error,'offline'=>$offline]
        ]);
        break;

    case 'update':
        $input = json_decode(file_get_contents('php://input'), true) ?: $_POST;
        $key = $input['key'] ?? '';
        $status = $input['status'] ?? 'online';
        $value = $input['value'] ?? null;
        $extra = $input['extra'] ?? null;

        if (!$key) { echo json_encode(['success'=>false,'error'=>'Missing key']); break; }

        $stmt = $pdo->prepare("SELECT * FROM monitoring_components WHERE component_key=?");
        $stmt->execute([$key]);
        $comp = $stmt->fetch();
        if (!$comp) { echo json_encode(['success'=>false,'error'=>'Not found: '.$key]); break; }

        $cur = json_decode($comp['extra_data'] ?? '{}', true) ?: [];
        if ($extra && is_array($extra)) $cur = array_merge($cur, $extra);

        $pdo->prepare("UPDATE monitoring_components SET status=?, value=?, extra_data=?, last_seen=NOW() WHERE component_key=?")
            ->execute([$status, $value, json_encode($cur), $key]);

        $pdo->prepare("INSERT INTO monitoring_history (component_id, value, status) VALUES (?,?,?)")
            ->execute([$comp['id'], $value, $status]);

        echo json_encode(['success'=>true,'message'=>'Updated '.$key]);
        break;

    case 'history':
        $id = (int)($_GET['id'] ?? 0);
        $limit = (int)($_GET['limit'] ?? 50);
        $stmt = $pdo->prepare("SELECT h.*, c.component_name, c.unit FROM monitoring_history h
            JOIN monitoring_components c ON c.id=h.component_id WHERE h.component_id=?
            ORDER BY h.recorded_at DESC LIMIT ?");
        $stmt->execute([$id, $limit]);
        echo json_encode(['success'=>true,'data'=>$stmt->fetchAll()]);
        break;

    case 'bulk_update':
        $input = json_decode(file_get_contents('php://input'), true);
        $components = $input['components'] ?? [];
        $updated = 0;
        foreach ($components as $c) {
            $k = $c['key'] ?? ''; if (!$k) continue;
            $s = $c['status'] ?? 'online'; $v = $c['value'] ?? null; $e = $c['extra'] ?? null;
            $row = $pdo->prepare("SELECT extra_data FROM monitoring_components WHERE component_key=?");
            $row->execute([$k]); $r = $row->fetch();
            $cur = json_decode($r['extra_data'] ?? '{}', true) ?: [];
            if ($e && is_array($e)) $cur = array_merge($cur, $e);
            $pdo->prepare("UPDATE monitoring_components SET status=?, value=?, extra_data=?, last_seen=NOW() WHERE component_key=?")
                ->execute([$s, $v, json_encode($cur), $k]);
            $updated++;
        }
        echo json_encode(['success'=>true,'updated'=>$updated]);
        break;

    default:
        echo json_encode(['success'=>false,'error'=>'Invalid action',
            'actions'=>['status','update','bulk_update','history']]);
}