<?php

declare(strict_types=1);

namespace Stancl\Tenancy\Overrides;

use BackedEnum;
use Illuminate\Routing\UrlGenerator;
use Illuminate\Support\Arr;
use InvalidArgumentException;
use Stancl\Tenancy\Resolvers\PathTenantResolver;

/**
 * This class is used in place of the default UrlGenerator when UrlGeneratorBootstrapper is enabled.
 *
 * TenancyUrlGenerator does two extra things:
 *
 * - Autofills the tenant parameter in the tenant context with the current tenant if $passTenantParameterToRoutes is enabled.
 * With path identification, this is required to be done by URL::defaults() -- setting
 * UrlGeneratorBootstrapper::$addTenantParameterToDefaults (which is false by default) to true handles that.
 * Enabling $passTenantParameterToRoutes is preferable with query string identification.
 *
 * - Prepends the route name passed to route() and URL::temporarySignedRoute()
 * with `tenant.` (or the configured prefix) if $prefixRouteNames is enabled (disabled by default).
 * Primarily intended to be used with path identification.
 *
 * This behavior can be bypassed by passing the $bypassParameter to the mentioned methods (`['central' => true]` by default).
 */
class TenancyUrlGenerator extends UrlGenerator
{
    /**
     * Parameter which bypasses the behavior modification of route() and temporarySignedRoute().
     *
     * For example, in tenant context:
     * Route::get('/', ...)->name('home');
     * Route::get('/tenant', ...)->middleware(InitializeTenancyByRequestData::class)->name('tenant.home');
     * - route('home') => app.test/tenant?tenant=tenantKey
     * - route('home', [$bypassParameter => true]) => app.test/
     * - route('tenant.home', [$bypassParameter => true]) => app.test/tenant  -- query string identification (no query string passed)
     *
     * With path identification, it is recommended to pass the tenant parameter automatically by setting
     * UrlGeneratorBootstrapper::$addTenantParameterToDefaults to true,
     * and in that case, this affects only the automatic route name prefixing,
     * and the forceful route name overrides set in the $override property.
     *
     * @see UrlGeneratorBootstrapper
     */
    public static string $bypassParameter = 'central';

    /**
     * Determine if the route names passed to `route()` or `temporarySignedRoute()`
     * should get prefixed with the tenant route name prefix.
     *
     * This is useful when using path identification with packages that generate URLs,
     * like Jetstream, so that you don't have to manually prefix route names passed to each route() call.
     */
    public static bool $prefixRouteNames = false;

    /**
     * Determine if the tenant parameter should get passed
     * to the links generated by `route()` or `temporarySignedRoute()` whenever available.
     * This is primarily intended to be used with query string identification.
     *
     * With path identification, the tenant parameter is passed by URL::defaults()
     * when UrlGeneratorBootstrapper::$addTenantParameterToDefaults is true (which is the default).
     *
     * @see UrlGeneratorBootstrapper
     */
    public static bool $passTenantParameterToRoutes = false;

    /**
     * Route names that should always be overridden.
     * This behavior can still be bypassed by passing the bypass parameter.
     *
     * For example, Jetstream integration:
     * [
     *     'profile.show' => 'tenant.profile.show',
     *     'two-factor.login' => 'tenant.two-factor.login',
     * ]
     *
     * `route('profile.show')` will return an URL as if you called `route('tenant.profile.show')`.
     * `route('profile.show', ['central' => true])` will return an URL as if you called `route('profile.show')`.
     */
    public static array $override = [];

    /**
     * Override the route() method so that the route name gets prefixed
     * and the tenant parameter gets added when in tenant context.
     */
    public function route($name, $parameters = [], $absolute = true)
    {
        if ($name instanceof BackedEnum && ! is_string($name = $name->value)) { // @phpstan-ignore function.impossibleType
            throw new InvalidArgumentException('Attribute [name] expects a string backed enum.');
        }

        [$name, $parameters] = $this->prepareRouteInputs($name, Arr::wrap($parameters)); // @phpstan-ignore argument.type

        return parent::route($name, $parameters, $absolute);
    }

    /**
     * Override the temporarySignedRoute() method so that the route name gets prefixed
     * and the tenant parameter gets added when in tenant context.
     */
    public function temporarySignedRoute($name, $expiration, $parameters = [], $absolute = true)
    {
        if ($name instanceof BackedEnum && ! is_string($name = $name->value)) { // @phpstan-ignore function.impossibleType
            throw new InvalidArgumentException('Attribute [name] expects a string backed enum.');
        }

        [$name, $parameters] = $this->prepareRouteInputs($name, Arr::wrap($parameters)); // @phpstan-ignore argument.type

        return parent::temporarySignedRoute($name, $expiration, $parameters, $absolute);
    }

    /**
     * Return bool indicating if the bypass parameter was in $parameters.
     */
    protected function routeBehaviorModificationBypassed(mixed $parameters): bool
    {
        if (isset($parameters[static::$bypassParameter])) {
            return (bool) $parameters[static::$bypassParameter];
        }

        return false;
    }

    /**
     * Takes a route name and an array of parameters to return the prefixed route name
     * and the route parameters with the tenant parameter added.
     *
     * To skip these modifications, pass the bypass parameter in route parameters.
     * Before returning the modified route inputs, the bypass parameter is removed from the parameters.
     */
    protected function prepareRouteInputs(string $name, array $parameters): array
    {
        if (! $this->routeBehaviorModificationBypassed($parameters)) {
            $name = $this->routeNameOverride($name) ?? $this->prefixRouteName($name);
            $parameters = $this->addTenantParameter($parameters);
        }

        // Remove bypass parameter from the route parameters
        unset($parameters[static::$bypassParameter]);

        return [$name, $parameters];
    }

    /**
     * If $prefixRouteNames is true, prefix the passed route name.
     */
    protected function prefixRouteName(string $name): string
    {
        $tenantPrefix = PathTenantResolver::tenantRouteNamePrefix();

        if (static::$prefixRouteNames && ! str($name)->startsWith($tenantPrefix)) {
            $name = str($name)->after($tenantPrefix)->prepend($tenantPrefix)->toString();
        }

        return $name;
    }

    /**
     * If `tenant()` isn't null, add tenant parameter to the passed parameters.
     */
    protected function addTenantParameter(array $parameters): array
    {
        return tenant() && static::$passTenantParameterToRoutes ? array_merge($parameters, [PathTenantResolver::tenantParameterName() => tenant()->getTenantKey()]) : $parameters;
    }

    protected function routeNameOverride(string $name): string|null
    {
        return static::$override[$name] ?? null;
    }
}