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

/* Copyright (C) 2026 Moko Consulting <hello@mokoconsulting.tech>
 *
 * This file is part of a Moko Consulting project.
 *
 * SPDX-License-Identifier: GPL-3.0-or-later
 *
 * FILE INFORMATION
 * DEFGROUP: MokoStandards.Scripts.Validate
 * INGROUP: MokoStandards
 * REPO: https://git.mokoconsulting.tech/MokoConsulting/moko-platform
 * PATH: /validate/check_changelog.php
 * BRIEF: Validates CHANGELOG.md structure and format
 */

declare(strict_types=1);

require_once __DIR__ . '/../../vendor/autoload.php';

use MokoEnterprise\CliFramework;

/**
 * Validates that CHANGELOG.md exists (in root, src/, or docs/) and follows Keep a Changelog format.
 *
 * By default passes as long as any ## [...] heading is present.
 * Use --strict to also require an ## [Unreleased] section.
 */
class CheckChangelog extends CliFramework
{
    /** Directories searched for CHANGELOG.md, relative to --path (case-insensitive match). */
    private const SEARCH_DIRS = ['', 'src', 'docs'];

    /**
     * Configure available arguments.
     */
    protected function configure(): void
    {
        $this->setDescription('Validates CHANGELOG.md structure and format');
        $this->addArgument('--path', 'Repository path to check', '.');
        $this->addArgument('--strict', 'Also require an [Unreleased] section', false);
    }

    /**
     * Validate CHANGELOG.md.
     *
     * @return int  Exit code: 0 on pass, 1 on failure.
     */
    protected function run(): int
    {
        $path   = rtrim($this->getArgument('--path'), '/\\');
        $strict = (bool) $this->getArgument('--strict');

        $this->section('Checking CHANGELOG.md');

        $found = $this->findChangelog($path);

        if ($found === null) {
            $this->status(false, 'CHANGELOG.md found (checked root, src/, docs/)');
            $this->printSummary(0, 1, $this->elapsed());
            return 1;
        }

        $rel = ltrim(str_replace(str_replace('\\', '/', $path), '', str_replace('\\', '/', $found)), '/');
        $this->status(true, "CHANGELOG.md found: {$rel}");

        // Error if CHANGELOG exists at root AND in a subdirectory simultaneously
        if ($rel !== 'CHANGELOG.md' && is_file($path . '/CHANGELOG.md')) {
            $this->status(false, 'CHANGELOG.md duplicate: exists at root AND ' . dirname($rel));
            $this->printSummary(0, 1, $this->elapsed());
            return 1;
        }

        $content = (string) file_get_contents($found);
        $passed  = 1;
        $failed  = 0;

        // Require Keep a Changelog format (any versioned heading)
        if (preg_match('/^## \[/m', $content)) {
            $this->status(true, 'Keep a Changelog format (## [...])');
            $passed++;
        } else {
            $this->status(false, 'Keep a Changelog format (## [...]) — no versioned headings found');
            $failed++;
        }

        // --strict: also require an [Unreleased] section
        if ($strict) {
            if (preg_match('/^## \[Unreleased\]/mi', $content)) {
                $this->status(true, '[Unreleased] section present');
                $passed++;
            } else {
                $this->status(false, '[Unreleased] section missing (required by --strict)');
                $failed++;
            }
        }

        $this->printSummary($passed, $failed, $this->elapsed());

        return $failed > 0 ? 1 : 0;
    }

    /**
     * Find CHANGELOG.md case-insensitively in root, src/, or docs/.
     *
     * @param string $repoPath  Absolute path to the repository root.
     * @return string|null      Absolute path to the found file, or null if not found.
     */
    private function findChangelog(string $repoPath): ?string
    {
        foreach (self::SEARCH_DIRS as $sub) {
            $dir = $sub === '' ? $repoPath : $repoPath . '/' . $sub;
            if (!is_dir($dir)) {
                continue;
            }
            $entries = @scandir($dir);
            if ($entries === false) {
                continue;
            }
            foreach ($entries as $entry) {
                if (strcasecmp($entry, 'CHANGELOG.md') === 0 && is_file($dir . '/' . $entry)) {
                    return $dir . '/' . $entry;
                }
            }
        }

        return null;
    }
}

$script = new CheckChangelog('check_changelog', 'Validates CHANGELOG.md structure and format');
exit($script->execute());