<?php

if (!function_exists('view')) {
    function view(string $view, array $data = []): string
    {
        $basedir = plugin_dir_path(__FILE__);
        extract($data, EXTR_SKIP);
        ob_start();
        include "{$basedir}resources/views/$view.php";

        return ob_get_clean();
    }
}

if (!function_exists('mahak_debug_enabled')) {
    function mahak_debug_enabled(): bool
    {
        return (bool) get_configured_option('debug-mode', false);
    }
}

if (!function_exists('mahak_render_error')) {
    function mahak_render_error(
        \Throwable $exception,
        int $status = 500,
        string $fallbackView = 'server-error',
        array $context = []
    ): void
    {
        if (mahak_debug_enabled()) {
            wp_die(
                view('debug-error', ['report' => mahak_build_debug_report($exception, $context)]),
                'Mahak Authentication Error',
                ['response' => $status]
            );
        }

        wp_die(view($fallbackView), 'Authentication Error', ['response' => $status]);
    }
}

if (!function_exists('mahak_build_debug_report')) {
    function mahak_build_debug_report(\Throwable $exception, array $context = []): array
    {
        $now = time();
        $wordpressTimezone = function_exists('wp_timezone_string')
            ? wp_timezone_string()
            : (string) get_option('timezone_string', '');

        if ($wordpressTimezone === '') {
            $wordpressTimezone = 'UTC offset '.(string) get_option('gmt_offset', 0);
        }

        $server = [
            'Unix timestamp' => (string) $now,
            'UTC time' => gmdate('Y-m-d H:i:s \U\T\C', $now),
            'PHP local time' => date('Y-m-d H:i:s P T', $now),
            'PHP timezone' => date_default_timezone_get(),
            'PHP date.timezone' => (string) (ini_get('date.timezone') ?: '[not set]'),
            'WordPress timezone' => $wordpressTimezone,
            'WordPress version' => get_bloginfo('version'),
            'PHP version' => PHP_VERSION,
            'Plugin version' => defined('MAHAK_AUTHENTICATE_BRIDGE_VERSION')
                ? MAHAK_AUTHENTICATE_BRIDGE_VERSION
                : '[unknown]',
        ];

        $jwtTimestamps = [];

        foreach (($context['jwt_timestamps'] ?? []) as $claim => $value) {
            $jwtTimestamps[strtoupper((string) $claim)] = mahak_format_jwt_timestamp((string) $value, $now);
        }

        $trace = mahak_sanitized_exception_trace($exception);
        $exceptionData = [
            'Type' => get_class($exception),
            'Message' => $exception->getMessage(),
            'Location' => $exception->getFile().':'.$exception->getLine(),
        ];

        $markdown = "# Mahak Authentication Error\n\n## Exception\n\n";

        foreach ($exceptionData as $label => $value) {
            $markdown .= '- '.$label.': `'.mahak_markdown_value($value)."`\n";
        }

        $markdown .= "\n## WordPress server diagnostics\n\n| Field | Value |\n|---|---|\n";

        foreach ($server as $label => $value) {
            $markdown .= '| '.mahak_markdown_value($label).' | `'.mahak_markdown_value($value)."` |\n";
        }

        $markdown .= "\n## JWT timing claims\n\n";

        if ($jwtTimestamps === []) {
            $markdown .= "No readable JWT timing claims were available.\n";
        } else {
            $markdown .= "| Claim | Value |\n|---|---|\n";

            foreach ($jwtTimestamps as $label => $value) {
                $markdown .= '| '.mahak_markdown_value($label).' | `'.mahak_markdown_value($value)."` |\n";
            }
        }

        $markdown .= "\n## Sanitized stack trace\n\n```text\n".str_replace('```', "'''", $trace)."\n```\n";
        $markdown .= "\n> JWT contents, request parameters, and function arguments are intentionally omitted.\n";

        return [
            'exception' => $exceptionData,
            'server' => $server,
            'jwt_timestamps' => $jwtTimestamps,
            'trace' => $trace,
            'markdown' => $markdown,
        ];
    }
}

if (!function_exists('mahak_format_jwt_timestamp')) {
    function mahak_format_jwt_timestamp(string $value, int $serverNow): string
    {
        if (!is_numeric($value)) {
            return $value.' (not numeric)';
        }

        $numericValue = (float) $value;
        $note = '';

        if (is_infinite($numericValue) || is_nan($numericValue)) {
            return $value.' (invalid numeric value)';
        }

        if (abs($numericValue) >= 100000000000) {
            $numericValue /= 1000;
            $note = '; appears to use milliseconds';
        }

        $timestamp = (int) $numericValue;
        $difference = $timestamp - $serverNow;
        $differenceLabel = ($difference >= 0 ? '+' : '').$difference.' seconds vs server';

        return $value.' ('.gmdate('Y-m-d H:i:s \U\T\C', $timestamp).'; '.$differenceLabel.$note.')';
    }
}

if (!function_exists('mahak_sanitized_exception_trace')) {
    function mahak_sanitized_exception_trace(\Throwable $exception): string
    {
        $lines = [];

        foreach ($exception->getTrace() as $index => $frame) {
            $location = isset($frame['file'])
                ? $frame['file'].':'.($frame['line'] ?? '?')
                : '[internal function]';
            $call = ($frame['class'] ?? '').($frame['type'] ?? '').($frame['function'] ?? '[unknown]').'()';
            $lines[] = '#'.$index.' '.$location.' '.$call;
        }

        $lines[] = '#'.count($lines).' {main}';

        return implode("\n", $lines);
    }
}

if (!function_exists('mahak_markdown_value')) {
    function mahak_markdown_value(string $value): string
    {
        return str_replace(["\r", "\n", '|', '`'], [' ', ' ', '\\|', "'"], $value);
    }
}

if (!function_exists('dd')) {
    function dd(): void
    {
        echo '<pre>';
        array_map(function ($arg) {
            var_dump($arg);
        }, func_get_args());
        die;
    }
}

function setup_configs(): void
{
    $configs = [];
    $configs_dir = plugin_dir_path(__FILE__).'configs';
    foreach (glob($configs_dir.'/*.php') as $configs_file) {
        $configs[basename($configs_file, '.php')] = include $configs_file;
    }

    define("MAHAK_CASHED_CONFIG", $configs);
}
setup_configs();

if (!function_exists('config')) {
    function config(string $key, ?string $default = null)
    {
        $value = MAHAK_CASHED_CONFIG;
        foreach (explode('.', $key) as $key) {
            $value = $value[$key] ?? $default;
        }
        return $value;
    }
}


if (!function_exists('get_configured_option')) {
    function get_configured_option(string $key, ?string $default = null)
    {
        return get_option(config("mahak.options.$key"), $default);
    }
}