#!/usr/bin/env php
<?php
/* Copyright (C) 2026 Moko Consulting <hello@mokoconsulting.tech>
 *
 * SPDX-License-Identifier: GPL-3.0-or-later
 *
 * FILE INFORMATION
 * DEFGROUP: moko-platform.CLI
 * INGROUP: moko-platform
 * REPO: https://git.mokoconsulting.tech/MokoConsulting/moko-platform
 * PATH: /cli/branch_rename.php
 * VERSION: 09.21.00
 * BRIEF: Rename a git branch via Gitea API (create new, update PR, delete old)
 *
 * Usage:
 *   php branch_rename.php --from dev --to rc --token TOKEN --api-base URL [--pr 42]
 *   php branch_rename.php --from dev --to rc --token TOKEN --api-base URL --pr 42 --dry-run
 */

declare(strict_types=1);

$from    = '';
$to      = '';
$token   = '';
$apiBase = '';
$prNum   = '';
$dryRun  = false;

foreach ($argv as $i => $arg) {
    if ($arg === '--from'     && isset($argv[$i + 1])) $from    = $argv[$i + 1];
    if ($arg === '--to'       && isset($argv[$i + 1])) $to      = $argv[$i + 1];
    if ($arg === '--token'    && isset($argv[$i + 1])) $token   = $argv[$i + 1];
    if ($arg === '--api-base' && isset($argv[$i + 1])) $apiBase = $argv[$i + 1];
    if ($arg === '--pr'       && isset($argv[$i + 1])) $prNum   = $argv[$i + 1];
    if ($arg === '--dry-run') $dryRun = true;
}

if (empty($from) || empty($to) || empty($token) || empty($apiBase)) {
    fwrite(STDERR, "Usage: branch_rename.php --from BRANCH --to BRANCH --token TOKEN --api-base URL [--pr NUM] [--dry-run]\n");
    exit(1);
}

if ($from === $to) {
    echo "Source and target are the same ({$from}) — nothing to do\n";
    exit(0);
}

$headers = [
    "Authorization: token {$token}",
    'Content-Type: application/json',
    'Accept: application/json',
];

/**
 * Make an API request.
 */
function apiRequest(string $method, string $url, array $headers, ?array $body = null): array
{
    $ch = curl_init();
    curl_setopt_array($ch, [
        CURLOPT_URL            => $url,
        CURLOPT_CUSTOMREQUEST  => $method,
        CURLOPT_RETURNTRANSFER => true,
        CURLOPT_HTTPHEADER     => $headers,
        CURLOPT_TIMEOUT        => 30,
    ]);

    if ($body !== null) {
        curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($body));
    }

    $response = curl_exec($ch);
    $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    curl_close($ch);

    return [
        'code' => $httpCode,
        'body' => json_decode($response ?: '{}', true) ?: [],
    ];
}

// Step 1: Verify source branch exists
echo "Checking source branch: {$from}\n";
$check = apiRequest('GET', "{$apiBase}/branches/{$from}", $headers);
if ($check['code'] !== 200) {
    fwrite(STDERR, "Source branch '{$from}' not found (HTTP {$check['code']})\n");
    exit(1);
}

// Step 2: Delete target branch if it already exists
$targetCheck = apiRequest('GET', "{$apiBase}/branches/{$to}", $headers);
if ($targetCheck['code'] === 200) {
    echo "Target branch '{$to}' already exists — deleting\n";
    if (!$dryRun) {
        apiRequest('DELETE', "{$apiBase}/branches/{$to}", $headers);
    }
}

// Step 3: Create new branch from source
echo "Creating branch: {$to} (from {$from})\n";
if (!$dryRun) {
    $create = apiRequest('POST', "{$apiBase}/branches", $headers, [
        'new_branch_name' => $to,
        'old_branch_name' => $from,
    ]);
    if ($create['code'] < 200 || $create['code'] >= 300) {
        fwrite(STDERR, "Failed to create branch '{$to}': HTTP {$create['code']}\n");
        fwrite(STDERR, json_encode($create['body']) . "\n");
        exit(1);
    }
}

// Step 4: Update PR head branch if PR number provided
if (!empty($prNum)) {
    echo "Updating PR #{$prNum} head branch: {$from} -> {$to}\n";
    if (!$dryRun) {
        $update = apiRequest('PATCH', "{$apiBase}/pulls/{$prNum}", $headers, [
            'head' => $to,
        ]);
        if ($update['code'] < 200 || $update['code'] >= 300) {
            fwrite(STDERR, "Warning: Could not update PR head branch (HTTP {$update['code']})\n");
            // Non-fatal — the PR may need manual update
        }
    }
}

// Step 5: Delete old source branch
echo "Deleting old branch: {$from}\n";
if (!$dryRun) {
    $delete = apiRequest('DELETE', "{$apiBase}/branches/{$from}", $headers);
    if ($delete['code'] !== 204 && $delete['code'] !== 200) {
        fwrite(STDERR, "Warning: Could not delete old branch '{$from}' (HTTP {$delete['code']})\n");
        // Non-fatal — branch protection may prevent deletion
    }
}

echo "Renamed: {$from} -> {$to}\n";
exit(0);