<?php

namespace Illuminate\Foundation\Exceptions\Renderer;

use Closure;
use Composer\Autoload\ClassLoader;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Foundation\Bootstrap\HandleExceptions;
use Illuminate\Http\Request;
use Illuminate\Support\Collection;
use Symfony\Component\ErrorHandler\Exception\FlattenException;

class Exception
{
    /**
     * The "flattened" exception instance.
     *
     * @var \Symfony\Component\ErrorHandler\Exception\FlattenException
     */
    protected $exception;

    /**
     * The current request instance.
     *
     * @var \Illuminate\Http\Request
     */
    protected $request;

    /**
     * The exception listener instance.
     *
     * @var \Illuminate\Foundation\Exceptions\Renderer\Listener
     */
    protected $listener;

    /**
     * The application's base path.
     *
     * @var string
     */
    protected $basePath;

    /**
     * Creates a new exception renderer instance.
     *
     * @param  \Symfony\Component\ErrorHandler\Exception\FlattenException  $exception
     * @param  \Illuminate\Http\Request  $request
     * @param  \Illuminate\Foundation\Exceptions\Renderer\Listener  $listener
     * @param  string  $basePath
     */
    public function __construct(FlattenException $exception, Request $request, Listener $listener, string $basePath)
    {
        $this->exception = $exception;
        $this->request = $request;
        $this->listener = $listener;
        $this->basePath = $basePath;
    }

    /**
     * Get the exception title.
     *
     * @return string
     */
    public function title()
    {
        return $this->exception->getStatusText();
    }

    /**
     * Get the exception message.
     *
     * @return string
     */
    public function message()
    {
        return $this->exception->getMessage();
    }

    /**
     * Get the exception class name.
     *
     * @return string
     */
    public function class()
    {
        return $this->exception->getClass();
    }

    /**
     * Get the exception code.
     *
     * @return int|string
     */
    public function code()
    {
        return $this->exception->getCode();
    }

    /**
     * Get the HTTP status code.
     *
     * @return int
     */
    public function httpStatusCode()
    {
        return $this->exception->getStatusCode();
    }

    /**
     * Get the exception's frames.
     *
     * @return \Illuminate\Support\Collection<int, Frame>
     */
    public function frames()
    {
        return once(function () {
            $classMap = array_map(function ($path) {
                return (string) realpath($path);
            }, array_values(ClassLoader::getRegisteredLoaders())[0]->getClassMap());

            $trace = array_values(array_filter(
                $this->exception->getTrace(), fn ($trace) => isset($trace['file']),
            ));

            if (($trace[1]['class'] ?? '') === HandleExceptions::class) {
                array_shift($trace);
                array_shift($trace);
            }

            $frames = [];
            $previousFrame = null;

            foreach (array_reverse($trace) as $frameData) {
                $frame = new Frame($this->exception, $classMap, $frameData, $this->basePath, $previousFrame);
                $frames[] = $frame;
                $previousFrame = $frame;
            }

            $frames = array_reverse($frames);

            foreach ($frames as $frame) {
                if (! $frame->isFromVendor()) {
                    $frame->markAsMain();
                    break;
                }
            }

            return new Collection($frames);
        });
    }

    /**
     * Get the exception's frames grouped by vendor status.
     *
     * @return array<int, array{is_vendor: bool, frames: array<int, Frame>}>
     */
    public function frameGroups()
    {
        $groups = [];

        foreach ($this->frames() as $frame) {
            $isVendor = $frame->isFromVendor();

            if (empty($groups) || $groups[array_key_last($groups)]['is_vendor'] !== $isVendor) {
                $groups[] = [
                    'is_vendor' => $isVendor,
                    'frames' => [],
                ];
            }

            $groups[array_key_last($groups)]['frames'][] = $frame;
        }

        return $groups;
    }

    /**
     * Get the exception's request instance.
     *
     * @return \Illuminate\Http\Request
     */
    public function request()
    {
        return $this->request;
    }

    /**
     * Get the request's headers.
     *
     * @return array<string, string>
     */
    public function requestHeaders()
    {
        return array_map(function (array $header) {
            return implode(', ', $header);
        }, $this->request()->headers->all());
    }

    /**
     * Get the request's body parameters.
     *
     * @return string|null
     */
    public function requestBody()
    {
        if (empty($payload = $this->request()->all())) {
            return null;
        }

        $json = (string) json_encode($payload, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE | JSON_PRETTY_PRINT);

        return str_replace('\\', '', $json);
    }

    /**
     * Get the application's route context.
     *
     * @return array<string, string>
     */
    public function applicationRouteContext()
    {
        $route = $this->request()->route();

        return $route ? array_filter([
            'controller' => $route->getActionName(),
            'route name' => $route->getName() ?: null,
            'middleware' => implode(', ', array_map(function ($middleware) {
                return $middleware instanceof Closure ? 'Closure' : $middleware;
            }, $route->gatherMiddleware())),
        ]) : [];
    }

    /**
     * Get the application's route parameters context.
     *
     * @return array<string, mixed>|null
     */
    public function applicationRouteParametersContext()
    {
        $parameters = $this->request()->route()?->parameters();

        return $parameters ? json_encode(array_map(
            fn ($value) => $value instanceof Model ? $value->withoutRelations() : $value,
            $parameters
        ), JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE | JSON_PRETTY_PRINT) : null;
    }

    /**
     * Get the application's SQL queries.
     *
     * @return array<int, array{connectionName: string, time: float, sql: string}>
     */
    public function applicationQueries()
    {
        return array_map(function (array $query) {
            $sql = $query['sql'];

            foreach ($query['bindings'] as $binding) {
                $sql = match (gettype($binding)) {
                    'integer', 'double' => preg_replace('/\?/', $binding, $sql, 1),
                    'NULL' => preg_replace('/\?/', 'NULL', $sql, 1),
                    default => preg_replace('/\?/', "'$binding'", $sql, 1),
                };
            }

            return [
                'connectionName' => $query['connectionName'],
                'time' => $query['time'],
                'sql' => $sql,
            ];
        }, $this->listener->queries());
    }
}