version

#!/usr/bin/env php
<?php

function halt($message)
{
    fwrite(STDERR, $message . "\n");
    exit(1);
}

function updateComposerVersion($type)
{
    $composerFile = 'composer.json';
    if (!file_exists($composerFile)) halt("Error: composer.json not found in the current directory.");

    $composerData = json_decode(file_get_contents($composerFile), true);

    if (json_last_error() !== JSON_ERROR_NONE) halt("Error: Unable to parse composer.json. Check for syntax errors.");
    if (!isset($composerData['version'])) halt("Error: Version not found in composer.json.");

    $version = $composerData['version'];
    if (!preg_match('/^(\d+)\.(\d+)\.(\d+)$/', $version, $matches))
        halt("Error: Version in composer.json must follow semantic versioning (e.g., 1.2.3).");

    list(, $major, $minor, $patch) = $matches;

    switch ($type) {
        case 'major':
            $major++;
            $minor = 0;
            $patch = 0;
            break;
        case 'minor':
            $minor++;
            $patch = 0;
            break;
        case 'patch':
            $patch++;
            break;
    }

    $newVersion = "{$major}.{$minor}.{$patch}";
    $composerData['version'] = $newVersion;

    if (file_put_contents($composerFile, json_encode($composerData, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES)) === false)
        halt("Error: Failed to write updated composer.json.");

    return $newVersion;
}

function updateVersionPHP($newVersion) {
    $versionFile = "src/Version.php";
    if (!file_exists($versionFile)) halt("Error: src/Version.php not found.");

    $newLines = [];
    $versionUpdated = false;

    $fileHandle = fopen($versionFile, 'r');
    if (!$fileHandle) halt("Error: Unable to read the file at {$versionFile}.");

    while (($line = fgets($fileHandle)) !== false) {
        if (preg_match("/const\s+SDK_VERSION\s*=\s*['\"](\d+)\.(\d+)\.(\d+)['\"]\s*;\s*/", $line)) {
            $line = "const SDK_VERSION = \"$newVersion\";\n";
            $versionUpdated = true;
        }

        $newLines[] = $line;
    }

    fclose($fileHandle);

    if (!$versionUpdated) halt("Error: SDK_VERSION constant not found in src/Version.php.");

    $fileHandle = fopen($versionFile, 'w');
    if (!$fileHandle) halt("Error: Unable to write the file at {$versionFile}.");

    foreach ($newLines as $line)
        fwrite($fileHandle, $line);

    fclose($fileHandle);
}

function checkGitStatus() {
    exec('git status --porcelain', $output, $returnCode);
    if ($returnCode !== 0) halt("Error: Unable to check git status.");
    if (!empty($output)) halt("Error: There are uncommitted changes in the working directory.");

    exec('git tag --points-at HEAD', $output, $returnCode);
    if ($returnCode !== 0) halt("Error: Unable to check git tags.");
    if (!empty($output)) halt("Error: HEAD is already tagged.");

    exec("git branch --show-current", $output, $returnCode);
    if ($returnCode !== 0) halt("Error: Unable to check current branch.");
    if ($output[0] !== 'main') halt("Error: You must be on the main branch to update the version.");
}

function gitTag($version) {
    exec("git add .", $output, $returnCode);
    if ($returnCode !== 0) halt("Error: Unable to stage changes.");

    exec("git commit -m \"v$version\"", $output, $returnCode);
    if ($returnCode !== 0) halt("Error: Unable to commit changes.");

    exec("git tag -a v$version -m v$version", $output, $returnCode);
    if ($returnCode !== 0) halt("Error: Unable to create git tag.");

    fwrite(STDOUT, "Tag v$version created.\n");
}

# Argument parsing -----------------------------------------------------------------------------------------------------

if ($argc !== 2) halt("Usage: {$argv[0]} [major|minor|patch]");

$allowedTypes = ['major', 'minor', 'patch'];
$type = $argv[1];

if (!in_array($type, $allowedTypes, true))
    halt("Invalid argument. Use 'major', 'minor', or 'patch'.");

# Main -----------------------------------------------------------------------------------------------------------------

checkGitStatus();

$newVersion = updateComposerVersion($type);
updateVersionPHP($newVersion);

gitTag($newVersion);