<?php

namespace Alexr\Voice\Adapters;

/**
 * Zadarma PBX webhook adapter.
 *
 * Zadarma sends POST with these params:
 *   - event: NOTIFY_START | NOTIFY_ANSWER | NOTIFY_END | NOTIFY_IVR
 *   - caller_id: caller's phone number
 *   - called_did: restaurant's Zadarma number
 *   - pbx_call_id: unique call ID
 *   - duration: call duration (on NOTIFY_END)
 *   - disposition: answered | no answer | busy (on NOTIFY_END)
 *
 * Webhook URL in Zadarma:
 *   Settings → Integrations and API → Notifications → About PBX calls
 */
class ZadarmaAdapter implements VoipAdapterInterface
{
	public function canHandle(array $payload): bool
	{
		// Zadarma always sends 'event' and 'caller_id'
		return isset($payload['event']) && isset($payload['caller_id']);
	}

	public function normalize(array $payload): array
	{
		$event = $payload['event'] ?? '';
		$disposition = $payload['disposition'] ?? '';

		// Determine if this is a missed call
		$isMissed = false;

		if ($event === 'NOTIFY_START') {
			// If we receive NOTIFY_START with redirection, the call was forwarded (missed)
			$isMissed = true;
		} elseif ($event === 'NOTIFY_END') {
			$isMissed = in_array($disposition, ['no answer', 'busy']);
		}

		return [
			'caller_phone' => sanitize_text_field($payload['caller_id'] ?? ''),
			'destination_phone' => sanitize_text_field($payload['called_did'] ?? ''),
			'call_id' => sanitize_text_field($payload['pbx_call_id'] ?? ''),
			'event_type' => $event,
			'is_missed' => $isMissed,
			'raw_payload' => $payload,
		];
	}

	public function getProviderName(): string
	{
		return 'zadarma';
	}

	public function handleVerification(): ?string
	{
		// Zadarma sends GET request with 'zd_echo' during webhook registration
		if (isset($_GET['zd_echo'])) {
			return sanitize_text_field($_GET['zd_echo']);
		}

		return null;
	}
}