#!/usr/bin/php
<?php

// A simple logger to avoid mixing debug output with protocol output
function log_message($msg) {
    file_put_contents("/tmp/debugger.log", $msg . "\n", FILE_APPEND);
}

// Function to send a DAP message (JSON payload) to STDOUT
function send_message(array $message) {
    $json = json_encode($message);
    $length = strlen($json);
    
    $response = "Content-Length: {$length}\r\n\r\n{$json}";
    
    log_message("SENDING: " . $response);
    echo $response;
    flush(); // Ensure the response is sent immediately
}

log_message("====================\nDebugger adapter started\n====================");

// --- Main Loop ---
$buffer = '';
while (false !== ($line = fgets(STDIN))) {
    // Read headers until we find a blank line
    if (trim($line) === '') {
        // Now read the JSON body based on the Content-Length we found
        preg_match('/Content-Length: (\d+)/', $buffer, $matches);
        $contentLength = isset($matches[1]) ? (int)$matches[1] : 0;
        
        if ($contentLength > 0) {
            $json_body = fread(STDIN, $contentLength);
            $buffer .= "\r\n\r\n" . $json_body;
            log_message("RECEIVED: " . $buffer);

            $request = json_decode($json_body, true);

            // --- Handle the request ---
            if (isset($request['command'])) {
                switch ($request['command']) {
                    case 'initialize':
                        // 1. Send the initialize response
                        send_message([
                            'seq' => 1,
                            'type' => 'response',
                            'request_seq' => $request['seq'],
                            'success' => true,
                            'command' => 'initialize',
                            'body' => [
                                'supportsConfigurationDoneRequest' => true,
                                'supportsSetVariable' => true,
                                'supportsVariableType' => true,
                            ],
                        ]);
                        
                        // 2. Send the 'initialized' event
                        send_message([
                            'seq' => 2,
                            'type' => 'event',
                            'event' => 'initialized',
                        ]);
                        break;

                    case 'launch':
                        // The IDE is asking us to start the script.
                        // For now, just acknowledge it.
                        log_message("Launch request received. Acknowledging.");
                        send_message([
                            'seq' => 3,
                            'type' => 'response',
                            'request_seq' => $request['seq'],
                            'success' => true,
                            'command' => 'launch',
                        ]);
                        // In a real debugger, you would now execute the target PHP file.
                        break;
                        
                    case 'setBreakpoints':
                        log_message("SetBreakpoints request received. Acknowledging.");
                        // Acknowledge that breakpoints were set.
                        send_message([
                            'seq' => 4,
                            'type' => 'response',
                            'request_seq' => $request['seq'],
                            'success' => true,
                            'command' => 'setBreakpoints',
                            'body' => [
                                // You would return the actual verified breakpoints here
                                'breakpoints' => $request['arguments']['breakpoints']
                            ]
                        ]);
                        break;
                        
                    case 'configurationDone':
                         log_message("Configuration is done. Acknowledging and sending fake 'stopped' event.");
                         // Acknowledge
                         send_message([
                            'seq' => 5,
                            'type' => 'response',
                            'request_seq' => $request['seq'],
                            'success' => true,
                            'command' => 'configurationDone'
                         ]);
                         
                         // *** FAKE IT! ***
                         // To test the variable flow, pretend we immediately hit a breakpoint.
                         send_message([
                             'seq' => 6,
                             'type' => 'event',
                             'event' => 'stopped',
                             'body' => [
                                 'reason' => 'breakpoint',
                                 'threadId' => 1,
                                 'text' => 'Paused on breakpoint'
                             ]
                         ]);
                         break;
                         
                    // ADD HANDLERS FOR stackTrace, scopes, variables HERE
                }
            }
        }
        
        // Reset buffer for the next message
        $buffer = '';
    } else {
        $buffer .= $line;
    }
}