<?php
declare(strict_types=1);

ini_set('memory_limit', '1024M');

const ACTION_SOURCE_URL = 'https://ff14.akurosiakamo.de/extras/json/xivapi_data/Action.json';

$rootDir = dirname(__DIR__);
$mitigationSource = $rootDir . '/api/analysis.php';
$plannerDataSource = $rootDir . '/js/ffxiv-data.js';
$outputFile = $rootDir . '/assets/jsons/Action.json';

function fail(string $message, int $code = 1): void
{
    fwrite(STDERR, $message . PHP_EOL);
    exit($code);
}

function extract_constant_array_literal(string $php, string $constantName): string
{
    $needle = 'const ' . $constantName . ' =';
    $start = strpos($php, $needle);

    if ($start === false) {
        fail('Could not find const ' . $constantName . ' in api/analysis.php');
    }

    $arrayStart = strpos($php, '[', $start);
    if ($arrayStart === false) {
        fail('Could not find array literal for ' . $constantName);
    }

    $depth = 0;
    $length = strlen($php);
    $inString = false;
    $stringQuote = '';
    $escaped = false;

    for ($i = $arrayStart; $i < $length; $i++) {
        $char = $php[$i];

        if ($inString) {
            if ($escaped) {
                $escaped = false;
                continue;
            }

            if ($char === '\\') {
                $escaped = true;
                continue;
            }

            if ($char === $stringQuote) {
                $inString = false;
                $stringQuote = '';
            }

            continue;
        }

        if ($char === '\'' || $char === '"') {
            $inString = true;
            $stringQuote = $char;
            continue;
        }

        if ($char === '[') {
            $depth++;
            continue;
        }

        if ($char === ']') {
            $depth--;

            if ($depth === 0) {
                return substr($php, $arrayStart, $i - $arrayStart + 1);
            }
        }
    }

    fail('Could not parse array literal for ' . $constantName);
}

function extract_js_const_object_literal(string $js, string $constantName): string
{
    $needle = 'const ' . $constantName . ' =';
    $start = strpos($js, $needle);

    if ($start === false) {
        fail('Could not find const ' . $constantName . ' in js/ffxiv-data.js');
    }

    $objectStart = strpos($js, '{', $start);
    if ($objectStart === false) {
        fail('Could not find object literal for ' . $constantName);
    }

    $depth = 0;
    $length = strlen($js);
    $inString = false;
    $stringQuote = '';
    $escaped = false;

    for ($i = $objectStart; $i < $length; $i++) {
        $char = $js[$i];

        if ($inString) {
            if ($escaped) {
                $escaped = false;
                continue;
            }

            if ($char === '\\') {
                $escaped = true;
                continue;
            }

            if ($char === $stringQuote) {
                $inString = false;
                $stringQuote = '';
            }

            continue;
        }

        if ($char === '\'' || $char === '"' || $char === '`') {
            $inString = true;
            $stringQuote = $char;
            continue;
        }

        if ($char === '{') {
            $depth++;
            continue;
        }

        if ($char === '}') {
            $depth--;

            if ($depth === 0) {
                return substr($js, $objectStart, $i - $objectStart + 1);
            }
        }
    }

    fail('Could not parse object literal for ' . $constantName);
}

function read_planner_ability_names(string $sourceFile): array
{
    if (!is_file($sourceFile)) {
        fail('Missing planner data source file: ' . $sourceFile);
    }

    $js = file_get_contents($sourceFile);
    if ($js === false) {
        fail('Could not read planner data source file: ' . $sourceFile);
    }

    $literal = extract_js_const_object_literal($js, 'JOB_ABILITIES');
    if (!preg_match_all('/\bname\s*:\s*([\'"])((?:\\\\.|(?!\1).)*)\1/s', $literal, $matches)) {
        fail('No abilities found in JOB_ABILITIES');
    }

    $names = [];
    foreach ($matches[2] as $rawName) {
        $name = stripcslashes($rawName);
        if ($name !== '') {
            $names[$name] = true;
        }
    }

    ksort($names, SORT_NATURAL | SORT_FLAG_CASE);
    return array_keys($names);
}

function read_mitigation_action_ids(string $sourceFile, array $abilityNames): array
{
    if (!is_file($sourceFile)) {
        fail('Missing mitigation source file: ' . $sourceFile);
    }

    $php = file_get_contents($sourceFile);
    if ($php === false) {
        fail('Could not read mitigation source file: ' . $sourceFile);
    }

    $literal = extract_constant_array_literal($php, 'MITIGATION_ABILITIES');
    $abilities = eval('return ' . $literal . ';');

    if (!is_array($abilities)) {
        fail('MITIGATION_ABILITIES did not parse as an array');
    }

    $wantedNames = array_fill_keys($abilityNames, true);
    $ids = [];
    foreach ($wantedNames as $name => $_) {
        if (!isset($abilities[$name])) {
            fwrite(STDERR, 'Planner ability missing in MITIGATION_ABILITIES: ' . $name . PHP_EOL);
            continue;
        }

        $ability = $abilities[$name];
        $id = (int)($ability['extraAbilityGameID'] ?? 0);
        if ($id <= 0) {
            fwrite(STDERR, 'Skipping mitigation without extraAbilityGameID: ' . $name . PHP_EOL);
            continue;
        }

        $ids[$id] = true;
    }

    if (!$ids) {
        fail('No extraAbilityGameID values found for abilities from js/ffxiv-data.js');
    }

    ksort($ids, SORT_NUMERIC);
    return array_keys($ids);
}

function download_url(string $url): string
{
    $lastError = '';
    $allowInsecureDownload = getenv('FF14_MITIGATOR_INSECURE_DOWNLOAD') === '1';

    if (function_exists('curl_init')) {
        $ch = curl_init($url);
        curl_setopt_array($ch, [
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_FOLLOWLOCATION => true,
            CURLOPT_CONNECTTIMEOUT => 15,
            CURLOPT_TIMEOUT => 120,
            CURLOPT_USERAGENT => 'ff14-mitigator-action-cache/1.0',
            CURLOPT_SSL_VERIFYPEER => !$allowInsecureDownload,
            CURLOPT_SSL_VERIFYHOST => $allowInsecureDownload ? 0 : 2,
        ]);

        $body = curl_exec($ch);
        $error = curl_error($ch);
        $status = (int)curl_getinfo($ch, CURLINFO_HTTP_CODE);
        curl_close($ch);

        if ($body !== false && $status >= 200 && $status < 300) {
            return $body;
        }

        $lastError = 'cURL HTTP ' . $status . ($error ? ': ' . $error : '');
    }

    $wrappers = stream_get_wrappers();
    if (in_array('https', $wrappers, true)) {
        $context = stream_context_create([
            'http' => [
                'timeout' => 120,
                'user_agent' => 'ff14-mitigator-action-cache/1.0',
            ],
            'ssl' => [
                'verify_peer' => !$allowInsecureDownload,
                'verify_peer_name' => !$allowInsecureDownload,
            ],
        ]);

        $body = file_get_contents($url, false, $context);
        if ($body !== false) {
            return $body;
        }

        $lastError = trim($lastError . '; file_get_contents failed', '; ');
    }

    if ($lastError !== '') {
        fail('Could not download Action.json. ' . $lastError);
    }

    fail('This PHP installation has neither cURL nor the HTTPS stream wrapper enabled.');
}

function action_field(array $action, string $field): ?int
{
    if (array_key_exists($field, $action) && is_numeric($action[$field])) {
        return (int)$action[$field];
    }

    $fields = $action['fields'] ?? null;
    if (is_array($fields) && array_key_exists($field, $fields) && is_numeric($fields[$field])) {
        return (int)$fields[$field];
    }

    return null;
}

$plannerAbilityNames = read_planner_ability_names($plannerDataSource);
$actionIds = read_mitigation_action_ids($mitigationSource, $plannerAbilityNames);
$wanted = array_fill_keys(array_map('strval', $actionIds), true);

$json = download_url(ACTION_SOURCE_URL);
$actions = json_decode($json, true);

if (!is_array($actions)) {
    fail('Downloaded Action.json is not valid JSON: ' . json_last_error_msg());
}

$filtered = [];
foreach ($wanted as $id => $_) {
    $action = $actions[$id] ?? null;
    if (!is_array($action)) {
        fwrite(STDERR, 'Missing action in downloaded Action.json: ' . $id . PHP_EOL);
        continue;
    }

    $filtered[$id] = [
        'cast' => action_field($action, 'Cast100ms'),
        'recast' => action_field($action, 'Recast100ms'),
    ];
}

if (!$filtered) {
    fail('No matching mitigation actions found in downloaded Action.json');
}

ksort($filtered, SORT_NUMERIC);

$outputDir = dirname($outputFile);
if (!is_dir($outputDir) && !mkdir($outputDir, 0775, true) && !is_dir($outputDir)) {
    fail('Could not create output directory: ' . $outputDir);
}

$encoded = json_encode($filtered, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE);
if ($encoded === false) {
    fail('Could not encode filtered Action.json: ' . json_last_error_msg());
}

if (file_put_contents($outputFile, $encoded . PHP_EOL, LOCK_EX) === false) {
    fail('Could not write output file: ' . $outputFile);
}

echo 'Saved ' . count($filtered) . ' actions to ' . $outputFile . PHP_EOL;