<?php

namespace Psalm\Internal\Cli;

use Composer\XdebugHandler\XdebugHandler;
use Psalm\Config;
use Psalm\Exception\UnsupportedIssueToFixException;
use Psalm\Internal\Analyzer\ProjectAnalyzer;
use Psalm\Internal\CliUtils;
use Psalm\Internal\Composer;
use Psalm\Internal\ErrorHandler;
use Psalm\Internal\IncludeCollector;
use Psalm\Internal\Provider\ClassLikeStorageCacheProvider;
use Psalm\Internal\Provider\FileProvider;
use Psalm\Internal\Provider\FileStorageCacheProvider;
use Psalm\Internal\Provider\ParserCacheProvider;
use Psalm\Internal\Provider\ProjectCacheProvider;
use Psalm\Internal\Provider\Providers;
use Psalm\Internal\Scanner\ParsedDocblock;
use Psalm\IssueBuffer;
use Psalm\Progress\DebugProgress;
use Psalm\Progress\DefaultProgress;
use Psalm\Report;
use Psalm\Report\ReportOptions;

use function array_filter;
use function array_key_exists;
use function array_map;
use function array_merge;
use function array_shift;
use function array_slice;
use function chdir;
use function count;
use function explode;
use function file_exists;
use function file_get_contents;
use function filter_var;
use function fwrite;
use function gc_collect_cycles;
use function gc_disable;
use function getcwd;
use function getopt;
use function implode;
use function in_array;
use function ini_set;
use function is_array;
use function is_dir;
use function is_string;
use function microtime;
use function pathinfo;
use function preg_replace;
use function preg_split;
use function realpath;
use function strpos;
use function strtolower;
use function substr;
use function trim;

use const DIRECTORY_SEPARATOR;
use const FILTER_NULL_ON_FAILURE;
use const FILTER_VALIDATE_BOOLEAN;
use const PATHINFO_EXTENSION;
use const PHP_EOL;
use const STDERR;

// phpcs:disable PSR1.Files.SideEffects

require_once __DIR__ . '/../ErrorHandler.php';
require_once __DIR__ . '/../CliUtils.php';
require_once __DIR__ . '/../Composer.php';
require_once __DIR__ . '/../IncludeCollector.php';
require_once __DIR__ . '/../../IssueBuffer.php';

/**
 * @internal
 */
final class Psalter
{
    private const SHORT_OPTIONS =  ['f:', 'm', 'h', 'r:', 'c:'];

    private const LONG_OPTIONS = [
        'help', 'debug', 'debug-by-line', 'debug-emitted-issues', 'config:', 'file:', 'root:',
        'plugin:', 'issues:', 'list-supported-issues', 'php-version:', 'dry-run', 'safe-types',
        'find-unused-code', 'threads:', 'codeowner:',
        'allow-backwards-incompatible-changes:',
        'add-newline-between-docblock-annotations:',
        'no-cache'
    ];

    /** @param array<int,string> $argv */
    public static function run(array $argv): void
    {
        gc_collect_cycles();
        gc_disable();

        ErrorHandler::install();

        self::setMemoryLimit();

        $args = array_slice($argv, 1);

        // get options from command line
        $options = getopt(implode('', self::SHORT_OPTIONS), self::LONG_OPTIONS);

        self::validateCliArguments($args);

        self::syncShortOptions($options);

        if (isset($options['c']) && is_array($options['c'])) {
            die('Too many config files provided' . PHP_EOL);
        }

        if (array_key_exists('h', $options)) {
            echo <<<HELP
            Usage:
                psalter [options] [file...]

            Options:
                -h, --help
                    Display this help message

                --debug, --debug-by-line, --debug-emitted-issues
                    Debug information

                -c, --config=psalm.xml
                    Path to a psalm.xml configuration file. Run psalm --init to create one.

                -m, --monochrome
                    Enable monochrome output

                -r, --root
                    If running Psalm globally you'll need to specify a project root. Defaults to cwd

                --plugin=PATH
                    Executes a plugin, an alternative to using the Psalm config

                --dry-run
                    Shows a diff of all the changes, without making them

                --safe-types
                    Only update PHP types when the new type information comes from other PHP types,
                    as opposed to type information that just comes from docblocks

                --php-version=PHP_MAJOR_VERSION.PHP_MINOR_VERSION

                --issues=IssueType1,IssueType2
                    If any issues can be fixed automatically, Psalm will update the codebase. To fix as many issues as
                    possible, use --issues=all

                --list-supported-issues
                    Display the list of issues that psalter knows how to fix

                --find-unused-code
                    Include unused code as a candidate for removal

                --threads=INT
                    If greater than one, Psalm will run analysis on multiple threads, speeding things up.

                --codeowner=[codeowner]
                    You can specify a GitHub code ownership group, and only that owner's code will be updated.

                --allow-backwards-incompatible-changes=BOOL
                    Allow Psalm modify method signatures that could break code outside the project. Defaults to true.

                --add-newline-between-docblock-annotations=BOOL
                    Whether to add or not add a new line between docblock annotations. Defaults to true.

                --no-cache
                    Runs Psalm without using cache

            HELP;

            exit;
        }

        if (!isset($options['issues']) &&
            !isset($options['list-supported-issues']) &&
            (!isset($options['plugin']) || $options['plugin'] === false)
        ) {
            fwrite(
                STDERR,
                'Please specify the issues you want to fix with --issues=IssueOne,IssueTwo or --issues=all, '
                . 'or provide a plugin that has its own manipulations with --plugin=path/to/plugin.php'
                . PHP_EOL
            );
            exit(1);
        }

        $current_dir = (string)getcwd() . DIRECTORY_SEPARATOR;

        if (isset($options['r']) && is_string($options['r'])) {
            $root_path = realpath($options['r']);

            if (!$root_path) {
                die('Could not locate root directory ' . $current_dir . DIRECTORY_SEPARATOR . $options['r'] . PHP_EOL);
            }

            $current_dir = $root_path . DIRECTORY_SEPARATOR;
        }

        $vendor_dir = CliUtils::getVendorDir($current_dir);

        // capture environment before registering autoloader (it may destroy it)
        IssueBuffer::captureServer($_SERVER);

        $include_collector = new IncludeCollector();
        $first_autoloader = $include_collector->runAndCollect(
            // we ignore the FQN because of a hack in scoper.inc that needs full path
            // phpcs:ignore SlevomatCodingStandard.Namespaces.ReferenceUsedNamesOnly.ReferenceViaFullyQualifiedName
            fn(): ?\Composer\Autoload\ClassLoader =>
                CliUtils::requireAutoloaders($current_dir, isset($options['r']), $vendor_dir)
        );


        // If Xdebug is enabled, restart without it
        (new XdebugHandler('PSALTER'))->check();

        $paths_to_check = CliUtils::getPathsToCheck($options['f'] ?? null);

        $path_to_config = CliUtils::getPathToConfig($options);

        $config = CliUtils::initializeConfig(
            $path_to_config,
            $current_dir,
            Report::TYPE_CONSOLE,
            $first_autoloader
        );
        $config->setIncludeCollector($include_collector);

        if ($config->resolve_from_config_file) {
            $current_dir = $config->base_dir;
            chdir($current_dir);
        }

        $threads = isset($options['threads']) ? (int)$options['threads'] : 1;

        if (isset($options['no-cache'])) {
            $providers = new Providers(
                new FileProvider()
            );
        } else {
            $providers = new Providers(
                new FileProvider(),
                new ParserCacheProvider($config, false),
                new FileStorageCacheProvider($config),
                new ClassLikeStorageCacheProvider($config),
                null,
                new ProjectCacheProvider(Composer::getLockFilePath($current_dir))
            );
        }

        if (array_key_exists('list-supported-issues', $options)) {
            echo implode(',', ProjectAnalyzer::getSupportedIssuesToFix()) . PHP_EOL;
            exit();
        }

        $debug = array_key_exists('debug', $options) || array_key_exists('debug-by-line', $options);
        $progress = $debug
            ? new DebugProgress()
            : new DefaultProgress();

        $stdout_report_options = new ReportOptions();
        $stdout_report_options->use_color = !array_key_exists('m', $options);

        $project_analyzer = new ProjectAnalyzer(
            $config,
            $providers,
            $stdout_report_options,
            [],
            $threads,
            $progress
        );

        if (array_key_exists('debug-by-line', $options)) {
            $project_analyzer->debug_lines = true;
        }

        if (array_key_exists('debug-emitted-issues', $options)) {
            $config->debug_emitted_issues = true;
        }

        if (array_key_exists('issues', $options)) {
            if (!is_string($options['issues']) || !$options['issues']) {
                die('Expecting a comma-separated list of issues' . PHP_EOL);
            }

            $issues = explode(',', $options['issues']);

            $keyed_issues = [];

            foreach ($issues as $issue) {
                $keyed_issues[$issue] = true;
            }
        } else {
            $keyed_issues = [];
        }

        CliUtils::initPhpVersion($options, $config, $project_analyzer);

        if (isset($options['codeowner'])) {
            $codeowner_files = self::loadCodeowners($providers);

            $desired_codeowners = is_array($options['codeowner']) ? $options['codeowner'] : [$options['codeowner']];

            $files_for_codeowners = self::loadCodeownersFiles($desired_codeowners, $codeowner_files);
            $paths_to_check = is_array($paths_to_check) ?
                array_merge($paths_to_check, $files_for_codeowners) :
                $files_for_codeowners;
        }

        if (isset($options['allow-backwards-incompatible-changes'])) {
            $allow_backwards_incompatible_changes = filter_var(
                $options['allow-backwards-incompatible-changes'],
                FILTER_VALIDATE_BOOLEAN,
                ['flags' => FILTER_NULL_ON_FAILURE]
            );

            if ($allow_backwards_incompatible_changes === null) {
                die('--allow-backwards-incompatible-changes expects a boolean value [true|false|1|0]' . PHP_EOL);
            }

            $project_analyzer->getCodebase()->allow_backwards_incompatible_changes
                = $allow_backwards_incompatible_changes;
        }

        if (isset($options['add-newline-between-docblock-annotations'])) {
            $doc_block_add_new_line_before_return = filter_var(
                $options['add-newline-between-docblock-annotations'],
                FILTER_VALIDATE_BOOLEAN,
                ['flags' => FILTER_NULL_ON_FAILURE]
            );

            if ($doc_block_add_new_line_before_return === null) {
                die('--add-newline-between-docblock-annotations expects a boolean value [true|false|1|0]' . PHP_EOL);
            }

            ParsedDocblock::addNewLineBetweenAnnotations($doc_block_add_new_line_before_return);
        }

        $plugins = [];

        if (isset($options['plugin'])) {
            $plugins = $options['plugin'];

            if (!is_array($plugins)) {
                $plugins = [$plugins];
            }
        }

        /** @var string $plugin_path */
        foreach ($plugins as $plugin_path) {
            Config::getInstance()->addPluginPath($current_dir . $plugin_path);
        }

        $find_unused_code = array_key_exists('find-unused-code', $options);

        foreach ($keyed_issues as $issue_name => $_) {
            // MissingParamType requires the scanning of all files to inform possible params
            if (strpos($issue_name, 'Unused') !== false
                || $issue_name === 'MissingParamType'
                || $issue_name === 'UnnecessaryVarAnnotation'
                || $issue_name === 'all'
            ) {
                $find_unused_code = true;
                break;
            }
        }

        if ($find_unused_code) {
            $project_analyzer->getCodebase()->reportUnusedCode();
        }

        $project_analyzer->alterCodeAfterCompletion(
            array_key_exists('dry-run', $options),
            array_key_exists('safe-types', $options)
        );

        if ($keyed_issues === ['all' => true]) {
            $project_analyzer->setAllIssuesToFix();
        } else {
            try {
                $project_analyzer->setIssuesToFix($keyed_issues);
            } catch (UnsupportedIssueToFixException $e) {
                fwrite(STDERR, $e->getMessage() . PHP_EOL);
                exit(1);
            }
        }

        $start_time = microtime(true);

        if ($paths_to_check === null || count($paths_to_check) > 1 || $find_unused_code) {
            if ($paths_to_check) {
                $files_to_update = [];

                foreach ($paths_to_check as $path_to_check) {
                    if (!is_dir($path_to_check)) {
                        $files_to_update[] = (string) realpath($path_to_check);
                    } else {
                        foreach ($providers->file_provider->getFilesInDir($path_to_check, ['php']) as $php_file_path) {
                            $files_to_update[] = $php_file_path;
                        }
                    }
                }

                $project_analyzer->getCodebase()->analyzer->setFilesToUpdate($files_to_update);
            }

            $project_analyzer->check($current_dir);
        } elseif ($paths_to_check) {
            foreach ($paths_to_check as $path_to_check) {
                if (is_dir($path_to_check)) {
                    $project_analyzer->checkDir($path_to_check);
                } else {
                    $project_analyzer->checkFile($path_to_check);
                }
            }
        }

        IssueBuffer::finish($project_analyzer, false, $start_time);
    }

    private static function setMemoryLimit(): void
    {
        $memLimit = CliUtils::getMemoryLimitInBytes();
        // Magic number is 4096M in bytes
        if ($memLimit > 0 && $memLimit < 8 * 1_024 * 1_024 * 1_024) {
            ini_set('memory_limit', (string) (8 * 1_024 * 1_024 * 1_024));
        }
    }

    /** @param array<int,string> $args */
    private static function validateCliArguments(array $args): void
    {
        array_map(
            function (string $arg): void {
                if (strpos($arg, '--') === 0 && $arg !== '--') {
                    $arg_name = preg_replace('/=.*$/', '', substr($arg, 2));

                    if ($arg_name === 'alter') {
                        // valid option for psalm, ignored by psalter
                        return;
                    }

                    if (!in_array($arg_name, self::LONG_OPTIONS)
                        && !in_array($arg_name . ':', self::LONG_OPTIONS)
                        && !in_array($arg_name . '::', self::LONG_OPTIONS)
                    ) {
                        fwrite(
                            STDERR,
                            'Unrecognised argument "--' . $arg_name . '"' . PHP_EOL
                            . 'Type --help to see a list of supported arguments'. PHP_EOL
                        );
                        exit(1);
                    }
                }
            },
            $args
        );
    }

    /**
     * @param array<string, false|list<mixed>|string> $options
     * @param-out array<string, false|list<mixed>|string> $options
     */
    private static function syncShortOptions(array &$options): void
    {
        if (array_key_exists('help', $options)) {
            $options['h'] = false;
        }

        if (array_key_exists('monochrome', $options)) {
            $options['m'] = false;
        }

        if (isset($options['config'])) {
            $options['c'] = $options['config'];
        }

        if (isset($options['root'])) {
            $options['r'] = $options['root'];
        }
    }

    /** @return array<string, array<int, string>> */
    private static function loadCodeowners(Providers $providers): array
    {
        if (file_exists('CODEOWNERS')) {
            $codeowners_file_path = realpath('CODEOWNERS');
        } elseif (file_exists('.github/CODEOWNERS')) {
            $codeowners_file_path = realpath('.github/CODEOWNERS');
        } elseif (file_exists('docs/CODEOWNERS')) {
            $codeowners_file_path = realpath('docs/CODEOWNERS');
        } else {
            die('Cannot use --codeowner without a CODEOWNERS file' . PHP_EOL);
        }

        $codeowners_file = file_get_contents($codeowners_file_path);

        $codeowner_lines = array_map(
            function (string $line): array {
                $line_parts = preg_split('/\s+/', $line);

                $file_selector = substr(array_shift($line_parts), 1);
                return [$file_selector, $line_parts];
            },
            array_filter(
                explode("\n", $codeowners_file),
                function (string $line): bool {
                    $line = trim($line);

                    // currently we don’t match wildcard files or files that could appear anywhere
                    // in the repo
                    return $line && $line[0] === '/' && strpos($line, '*') === false;
                }
            )
        );

        $codeowner_files = [];

        foreach ($codeowner_lines as [$path, $owners]) {
            if (!file_exists($path)) {
                continue;
            }

            foreach ($owners as $i => $owner) {
                $owners[$i] = strtolower($owner);
            }

            if (!is_dir($path)) {
                if (pathinfo($path, PATHINFO_EXTENSION) === 'php') {
                    $codeowner_files[$path] = $owners;
                }
            } else {
                foreach ($providers->file_provider->getFilesInDir($path, ['php']) as $php_file_path) {
                    $codeowner_files[$php_file_path] = $owners;
                }
            }
        }

        if (!$codeowner_files) {
            die('Could not find any available entries in CODEOWNERS' . PHP_EOL);
        }

        return $codeowner_files;
    }

    /**
     * @param array<string, array<int, string>> $codeowner_files
     * @return list<string>
     */
    private static function loadCodeownersFiles(array $desired_codeowners, array $codeowner_files): array
    {
        $paths_to_check = [];
        /** @psalm-suppress MixedAssignment */
        foreach ($desired_codeowners as $desired_codeowner) {
            if (!is_string($desired_codeowner)) {
                die('Invalid --codeowner ' . (string)$desired_codeowner . PHP_EOL);
            }

            if ($desired_codeowner[0] !== '@') {
                die('--codeowner option must start with @' . PHP_EOL);
            }

            $matched_file = false;

            foreach ($codeowner_files as $file_path => $owners) {
                if (in_array(strtolower($desired_codeowner), $owners)) {
                    $paths_to_check[] = $file_path;
                    $matched_file = true;
                }
            }

            if (!$matched_file) {
                die('User/group ' . $desired_codeowner . ' does not own any PHP files' . PHP_EOL);
            }
        }

        return $paths_to_check;
    }
}