<?php

declare(strict_types=1);

namespace Stancl\Tenancy\Resolvers;

use Illuminate\Database\Eloquent\Builder;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\Relation;
use Illuminate\Support\Str;
use Stancl\Tenancy\Contracts\Domain;
use Stancl\Tenancy\Contracts\SingleDomainTenant;
use Stancl\Tenancy\Contracts\Tenant;
use Stancl\Tenancy\Exceptions\TenantCouldNotBeIdentifiedOnDomainException;
use Stancl\Tenancy\Tenancy;

class DomainTenantResolver extends Contracts\CachedTenantResolver
{
    /** The model representing the domain that the tenant was identified on. */
    public static Domain|null $currentDomain = null;

    public function resolveWithoutCache(mixed ...$args): Tenant
    {
        $domain = $args[0];

        $tenant = static::findTenantByDomain($domain);

        /** @var (Tenant&Model)|null $tenant */
        if ($tenant) {
            static::setCurrentDomain($tenant, $domain);

            return $tenant;
        }

        throw new TenantCouldNotBeIdentifiedOnDomainException($domain);
    }

    public static function findTenantByDomain(string $domain): (Tenant&Model)|null
    {
        /** @var Tenant&Model $tenantModel */
        $tenantModel = tenancy()->model();

        if ($tenantModel instanceof SingleDomainTenant) {
            $tenant = $tenantModel->newQuery()
                ->with(Tenancy::$findWith)
                ->firstWhere('domain', $domain);
        } else {
            $tenant = $tenantModel->newQuery()
                ->whereHas('domains', fn (Builder $query) => $query->where('domain', $domain))
                ->with(array_unique(array_merge(Tenancy::$findWith, ['domains'])))
                ->first();
        }

        /** @var (Tenant&Model)|null $tenant */

        return $tenant;
    }

    public static function isSubdomain(string $domain): bool
    {
        return Str::endsWith($domain, config('tenancy.identification.central_domains'));
    }

    public function resolved(Tenant $tenant, mixed ...$args): void
    {
        $this->setCurrentDomain($tenant, $args[0]);
    }

    protected static function setCurrentDomain(Tenant $tenant, string $domain): void
    {
        /** @var Tenant&Model $tenant */
        $domainModelClass = config('tenancy.models.domain');

        if ($tenant instanceof SingleDomainTenant) {
            /**
             * Single-domain tenants keep their hostname on the tenant row, so there's no Domain record
             * we could look up. Build an in-memory instance that carries enough data for the Domain
             * contract binding (hostname + tenant relation).
             *
             * @var Domain&Model $domainModel
             */
            $domainModel = new $domainModelClass;
            $domainModel->forceFill([
                'domain' => $domain,
                Tenancy::tenantKeyColumn() => $tenant->getTenantKey(),
            ]);
            $domainModel->setRelation('tenant', $tenant);

            static::$currentDomain = $domainModel;

            return;
        }

        if (! $tenant->relationLoaded('domains')) {
            $tenant->loadMissing('domains');
        }

        /** @var (Domain&Model)|null $resolvedDomain */
        $resolvedDomain = $tenant->domains->firstWhere('domain', $domain);

        if (! $resolvedDomain) {
            $resolvedDomain = $domainModelClass::query()
                ->where('domain', $domain)
                ->where(Tenancy::tenantKeyColumn(), $tenant->getTenantKey())
                ->first();
        }

        static::$currentDomain = $resolvedDomain;
    }

    public function getPossibleCacheKeys(Tenant&Model $tenant): array
    {
        $domains = [];

        if ($tenant instanceof SingleDomainTenant) {
            $domains = array_filter([
                $tenant->getOriginal('domain'), // Previous domain
                $tenant->domain, // Current domain
            ]);
        } elseif (method_exists($tenant, 'domains') && $tenant->domains() instanceof Relation) {
            $tenant->unsetRelation('domains');

            $domains = $tenant->domains->map(function (Domain&Model $domain) {
                return $domain->domain;
            })->toArray();
        }

        return array_map(fn (string $domain) => $this->formatCacheKey($domain), $domains);
    }
}