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

require_once __DIR__ . '/../db/config.php';
require_once __DIR__ . '/analysis.php';

// Example: /api/alerts.php?symbol=BTCUSDT
$symbol = $_GET['symbol'] ?? 'BTCUSDT';

function check_bearish_alerts($symbol) {
    $alerts = [];

    // Fetch latest price
    $pdo = db();
    $stmt = $pdo->prepare("SELECT close_price FROM candlestick_data WHERE symbol = :symbol ORDER BY open_time DESC LIMIT 1");
    $stmt->bindParam(':symbol', $symbol, PDO::PARAM_STR);
    $stmt->execute();
    $current_price = $stmt->fetchColumn();

    if (!$current_price) {
        return [];
    }

    // Fetch analysis data
    $sma = calculate_sma($symbol, 20);
    $rsi = calculate_rsi($symbol, 14);
    $macd_data = calculate_macd($symbol);
    $patterns = calculate_patterns($symbol);

    // Condition 1: Price vs. SMA
    $price_below_sma = $current_price < $sma;

    // Condition 2: RSI indicates weakening momentum (e.g., dropping from overbought)
    // For simplicity, we'll check if RSI is above a certain threshold and not rising.
    // A more complex implementation would track RSI changes over time.
    $rsi_weakening = $rsi > 50; // Simplified: RSI is in the upper range, potential for reversal

    // Condition 3: MACD Bearish Crossover
    $macd_bearish_crossover = false;
    if ($macd_data && $macd_data['macd'] < $macd_data['signal']) {
        // Check if it just crossed
        // This requires historical data, for now, we check the current state
        $macd_bearish_crossover = true; // Simplified: MACD is below signal line
    }

    // Check original combo
    if ($price_below_sma && $rsi_weakening && $macd_bearish_crossover) {
        $alerts[] = [
            'type' => 'Strong Bearish Signal',
            'indicator' => 'SMA, RSI, MACD Combination',
            'message' => 'Price dropped below 20-period SMA, RSI is high, and MACD shows a bearish state.'
        ];
    }

    // Check for candlestick patterns
    if (!empty($patterns)) {
        foreach ($patterns as $pattern_name => $detected) {
            if ($detected) {
                $alerts[] = [
                    'type' => 'Strong Bearish Signal',
                    'indicator' => 'Candlestick Pattern',
                    'message' => 'Detected bearish pattern: ' . ucwords(str_replace('_', ' ', $pattern_name))
                ];
            }
        }
    }

    return $alerts;
}

$alerts = check_bearish_alerts($symbol);

echo json_encode([
    'symbol' => $symbol,
    'alerts' => $alerts,
    'timestamp' => time()
]);