<?php

namespace App\Support;

use App\Models\Stabile;
use App\Models\User;
use Illuminate\Support\Collection;
use Illuminate\Support\Facades\Auth;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Schema;

class StabileContext
{
    public const SESSION_KEY = 'netgescon.stabile_attivo_id';

    public static function setFromStabile(Stabile $stabile, ?User $user = null): bool
    {
        $user = $user ?? Auth::user();

        if ($user instanceof User) {
            return self::setActiveStabileId($user, (int) $stabile->id);
        }

        session([self::SESSION_KEY => (int) $stabile->id]);
        return true;
    }

    public static function resolveActiveStabileId(User $user): ?int
    {
        $allowed = self::accessibleStabili($user)->pluck('id')->map(fn($v) => (int) $v)->values();
        if ($allowed->isEmpty()) {
            session()->forget(self::SESSION_KEY);
            return null;
        }

        $sessionId = session(self::SESSION_KEY);
        if (is_numeric($sessionId)) {
            $sessionId = (int) $sessionId;
            if ($allowed->contains($sessionId)) {
                return $sessionId;
            }
        }

        // Persistenza: prova a ripristinare l'ultimo stabile usato dall'utente.
        $persistedId = self::getPersistedStabileId($user);
        if ($persistedId && $allowed->contains($persistedId)) {
            session([self::SESSION_KEY => $persistedId]);
            return $persistedId;
        }

        $default = (int) config('netgescon.defaults.default_stabile_id', 0);
        if ($default > 0 && $allowed->contains($default)) {
            session([self::SESSION_KEY => $default]);
            return $default;
        }

        $first = (int) $allowed->first();
        session([self::SESSION_KEY => $first]);
        return $first;
    }

    private static function getPersistedStabileId(User $user): ?int
    {
        if (! Schema::hasColumn('users', 'last_stabile_id')) {
            return null;
        }

        $candidate = $user->getAttribute('last_stabile_id');
        if (! is_numeric($candidate)) {
            $candidate = DB::table('users')->where('id', (int) $user->id)->value('last_stabile_id');
        }

        return is_numeric($candidate) ? (int) $candidate : null;
    }

    /**
     * @return Collection<int, Stabile>
     */
    public static function accessibleStabili(User $user): Collection
    {
        // Super-admin / admin: tutto
        if ($user->hasAnyRole(['super-admin', 'admin'])) {
            return Stabile::query()->attivi()->orderBy('codice_stabile')->get();
        }

        // Amministratore: per amministratore_id
        if ($user->hasRole('amministratore') && $user->amministratore) {
            $owned = Stabile::query()
                ->attivi()
                ->byAmministratore($user->amministratore->id)
                ->get();

            // Supporta anche assegnazioni esplicite (stesso pivot dei collaboratori).
            $assigned = $user->stabiliAssegnati()->where('stabili.attivo', true)->get();

            return $owned
                ->merge($assigned)
                ->unique('id')
                ->sortBy(fn(Stabile $s) => (string) $s->codice_stabile)
                ->values();
        }

        // Collaboratore: via pivot
        if ($user->hasRole('collaboratore')) {
            return $user->stabiliAssegnati()->where('attivo', true)->orderBy('codice_stabile')->get();
        }

        // Condomino / fornitore: per ora nessun accesso “stabili gestiti”
        return collect();
    }

    public static function getActiveStabileId(?User $user = null): ?int
    {
        if ($user) {
            return self::resolveActiveStabileId($user);
        }

        $sessionId = session(self::SESSION_KEY);
        if (is_numeric($sessionId)) {
            return (int) $sessionId;
        }

        $default = (int) config('netgescon.defaults.default_stabile_id', 0);
        if ($default > 0) {
            return $default;
        }

        if ($user) {
            return self::accessibleStabili($user)->first()?->id;
        }

        return null;
    }

    public static function getActiveStabile(?User $user = null): ?Stabile
    {
        $id = self::getActiveStabileId($user);
        if (! $id) {
            return null;
        }

        if ($user) {
            return self::accessibleStabili($user)->firstWhere('id', $id);
        }

        return Stabile::query()->find($id);
    }

    public static function setActiveStabileId(User $user, int $stabileId): bool
    {
        $allowed = self::accessibleStabili($user)->pluck('id')->map(fn($v) => (int) $v)->all();
        if (! in_array($stabileId, $allowed, true)) {
            return false;
        }

        session([self::SESSION_KEY => $stabileId]);

        if (Schema::hasColumn('users', 'last_stabile_id')) {
            try {
                DB::table('users')->where('id', (int) $user->id)->update(['last_stabile_id' => $stabileId]);
            } catch (\Throwable) {
                // best-effort: non bloccare la sessione
            }
        }

        return true;
    }
}