<?php
namespace App\Services\Documenti;

use App\Models\Documento;
use App\Models\DocumentoStabile;
use App\Models\User;
use App\Support\StabileContext;
use Illuminate\Database\Eloquent\Builder;
use Illuminate\Support\Facades\Schema;

class DocumentoArchivioVisibilityService
{
    public function scopeVisibleDocumenti(Builder $query, User $user): Builder
    {
        $activeStabile = StabileContext::getActiveStabile($user);
        if ($activeStabile !== null) {
            $query->where('stabile_id', (int) $activeStabile->id);
        } elseif (! $user->hasAnyRole(['super-admin', 'admin'])) {
            $allowedIds = StabileContext::accessibleStabili($user)
                ->pluck('id')
                ->map(fn($value): int => (int) $value)
                ->all();

            if ($allowedIds === []) {
                $query->whereRaw('1 = 0');

                return $query;
            }

            $query->whereIn('stabile_id', $allowedIds);
        }

        return $query->where(function (Builder $documentQuery) use ($user): void {
            $documentQuery->whereNull('cartella_archivio_id')
                ->where(function (Builder $baseVisibility) use ($user): void {
                    $baseVisibility->whereNull('visibility_scope')
                        ->orWhere('visibility_scope', 'interno')
                        ->orWhere(function (Builder $restricted) use ($user): void {
                            $this->applyVisibilityConstraint($restricted, $user, 'documenti');
                        });
                })
                ->orWhereHas('cartellaArchivio', function (Builder $folderQuery) use ($user): void {
                    $folderQuery->where('is_active', true);
                    $this->applyVisibilityConstraint($folderQuery, $user, 'documento_archivio_cartelle');
                });
        });
    }

    public function scopeVisibleCartelle(Builder $query, User $user, ?int $stabileId = null): Builder
    {
        if ($stabileId !== null && $stabileId > 0) {
            $query->where('stabile_id', $stabileId);
        } else {
            $activeStabile = StabileContext::getActiveStabile($user);
            if ($activeStabile !== null) {
                $query->where('stabile_id', (int) $activeStabile->id);
            } elseif (! $user->hasAnyRole(['super-admin', 'admin'])) {
                $allowedIds = StabileContext::accessibleStabili($user)
                    ->pluck('id')
                    ->map(fn($value): int => (int) $value)
                    ->all();

                if ($allowedIds === []) {
                    $query->whereRaw('1 = 0');

                    return $query;
                }

                $query->whereIn('stabile_id', $allowedIds);
            }
        }

        $query->where('is_active', true);
        $this->applyVisibilityConstraint($query, $user, 'documento_archivio_cartelle');

        return $query;
    }

    public function canAccessDocumento(User $user, Documento $documento): bool
    {
        return $this->scopeVisibleDocumenti(Documento::query()->whereKey($documento->getKey()), $user)->exists();
    }

    public function canAccessDocumentoStabile(User $user, DocumentoStabile $documentoStabile): bool
    {
        $allowedIds = StabileContext::accessibleStabili($user)
            ->pluck('id')
            ->map(fn($value): int => (int) $value)
            ->all();

        return in_array((int) $documentoStabile->stabile_id, $allowedIds, true);
    }

    private function applyVisibilityConstraint(Builder $query, User $user, string $table): void
    {
        if (! $this->hasVisibilityColumn($table, 'visibility_scope')) {
            return;
        }

        $roles                 = $user->getRoleNames()->map(fn($role): string => (string) $role)->values()->all();
        $groupLabels           = $this->resolveAudienceGroupsForUser($user);
        $userId                = (int) $user->id;
        $hasRolesColumn        = $this->hasVisibilityColumn($table, 'visibility_roles');
        $hasGroupsColumn       = $this->hasVisibilityColumn($table, 'visibility_groups');
        $hasAllowedUsersColumn = $this->hasVisibilityColumn($table, 'allowed_user_ids');

        $query->where(function (Builder $visibilityQuery) use ($table, $roles, $groupLabels, $userId, $hasRolesColumn, $hasGroupsColumn, $hasAllowedUsersColumn): void {
            $visibilityQuery->whereNull($table . '.visibility_scope')
                ->orWhere($table . '.visibility_scope', 'interno')
                ->orWhere($table . '.visibility_scope', 'studio')
                ->orWhere(function (Builder $restrictedQuery) use ($table, $roles, $groupLabels, $userId, $hasRolesColumn, $hasGroupsColumn, $hasAllowedUsersColumn): void {
                    $restrictedQuery->where($table . '.visibility_scope', 'restricted')
                        ->where(function (Builder $matchQuery) use ($table, $roles, $groupLabels, $userId, $hasRolesColumn, $hasGroupsColumn, $hasAllowedUsersColumn): void {
                            $hasAudienceConstraint = false;

                            if ($hasRolesColumn && $roles !== []) {
                                foreach ($roles as $role) {
                                    $matchQuery->orWhereJsonContains($table . '.visibility_roles', $role);
                                }

                                $hasAudienceConstraint = true;
                            }

                            if ($hasGroupsColumn && $groupLabels !== []) {
                                foreach ($groupLabels as $groupLabel) {
                                    $matchQuery->orWhereJsonContains($table . '.visibility_groups', $groupLabel);
                                }

                                $hasAudienceConstraint = true;
                            }

                            if ($hasAllowedUsersColumn) {
                                $matchQuery->orWhereJsonContains($table . '.allowed_user_ids', $userId);
                                $hasAudienceConstraint = true;
                            }

                            if (! $hasAudienceConstraint) {
                                $matchQuery->whereRaw('1 = 0');
                            }
                        });
                });
        });
    }

    private function hasVisibilityColumn(string $table, string $column): bool
    {
        static $cache = [];

        $cacheKey = $table . '.' . $column;
        if (! array_key_exists($cacheKey, $cache)) {
            $cache[$cacheKey] = Schema::hasColumn($table, $column);
        }

        return $cache[$cacheKey];
    }

    private function resolveAudienceGroupsForUser(User $user): array
    {
        $groups = [];

        if ($user->hasAnyRole(['super-admin', 'admin', 'amministratore'])) {
            $groups[] = 'Amministratore';
            $groups[] = 'Studio completo';
        }

        if ($user->hasRole('collaboratore')) {
            $groups[] = 'Collaboratori interni';
        }

        return array_values(array_unique($groups));
    }
}