<?php

namespace App\Services;

use App\Models\PurchaseOrder;
use App\Models\SupplierEvaluation;
use App\Models\SupplierImprovement;
use App\Models\User;
use Illuminate\Support\Facades\DB;
use Illuminate\Validation\ValidationException;

class SupplierImprovementWorkflow
{
    public function canParticipate(User $actor, SupplierEvaluation $evaluation): bool
    {
        $guard = app(ConflictGuard::class);
        if ($guard->hasConflict($actor->id, $evaluation->supplier_id, null)) {
            return false;
        }
        foreach (PurchaseOrder::query()->whereIn('id', $evaluation->payload['order_ids'])->pluck('requisition_id') as $id) {
            if ($guard->hasConflict($actor->id, $evaluation->supplier_id, (int) $id)) {
                return false;
            }
        }

        return true;
    }

    /** @return array<string,mixed> */
    public function snapshot(SupplierImprovement $measure): array
    {
        return $measure->only(['id', 'supplier_evaluation_id', 'created_by', 'responsible_id', 'title', 'description', 'due_on', 'version', 'status', 'contributors', 'result', 'evidence', 'reviewed_by', 'review_reason', 'reviewed_at', 'created_at', 'updated_at']);
    }

    private function assignee(User $actor, SupplierEvaluation $evaluation, int $id): User
    {
        $user = User::query()->where('tenant_id', $actor->tenant_id)->lockForUpdate()->find($id);
        if (! $user || ! $user->hasFunctions(SupplierEvaluationWorkflow::ROLES)
            || ($user->departmentScoped() && ($user->department_id === null || $user->department_id !== $evaluation->department_id))
            || ! $this->canParticipate($user, $evaluation)) {
            throw ValidationException::withMessages(['responsible_id' => 'Escolha um responsável autorizado desta empresa, sem conflito no âmbito avaliado.']);
        }

        return $user;
    }

    /** @param array<string,mixed> $data */
    public function execute(User $actor, int $evaluationId, ?int $id, string $command, array $data): SupplierImprovement
    {
        return DB::transaction(function () use ($actor, $evaluationId, $id, $command, $data) {
            app(ConflictGuard::class)->lockCompany($actor);
            $actor = app(CurrentActor::class)->lock($actor, SupplierEvaluationWorkflow::ROLES);
            $evaluation = SupplierEvaluation::query()->visibleTo($actor)->lockForUpdate()->findOrFail($evaluationId);
            abort_unless($evaluation->status === 'approved', 409, 'Associe medidas à revisão aprovada da avaliação.');
            abort_unless($this->canParticipate($actor, $evaluation), 403, 'Existe um conflito no âmbito desta avaliação.');
            if ($command === 'create') {
                $plan = ['title' => $data['title'], 'description' => $data['description'], 'responsible_id' => (int) $data['responsible_id'], 'due_on' => $data['due_on']];
                $hash = hash('sha256', json_encode([$evaluationId, $plan], JSON_THROW_ON_ERROR));
                $existing = SupplierImprovement::query()->where('operation_key', $data['operation_key'])->first();
                if ($existing) {
                    abort_unless($existing->created_by === $actor->id && $existing->creation_hash === $hash, 409, 'Pedido de criação já utilizado.');

                    return $existing;
                }
                $responsible = $this->assignee($actor, $evaluation, $plan['responsible_id']);
                $measure = SupplierImprovement::query()->create([...$plan, 'tenant_id' => $actor->tenant_id, 'supplier_evaluation_id' => $evaluationId,
                    'created_by' => $actor->id, 'operation_key' => $data['operation_key'], 'creation_hash' => $hash,
                    'contributors' => array_values(array_unique([$actor->id, $responsible->id]))]);
                $before = null;
            } else {
                $measure = SupplierImprovement::query()->where('supplier_evaluation_id', $evaluationId)->lockForUpdate()->findOrFail($id);
                if ($measure->version !== (int) $data['version']) {
                    throw ValidationException::withMessages(['version' => 'A medida foi alterada. Consulte a versão actual antes de comparar; os seus dados não foram sobrepostos.']);
                }
                abort_if($measure->status === 'closed', 409, 'A medida já está encerrada e preservada.');
                $before = $this->snapshot($measure);
                if ($command === 'plan') {
                    abort_unless(in_array($measure->status, ['open', 'returned'], true), 409);
                    $responsible = $this->assignee($actor, $evaluation, (int) $data['responsible_id']);
                    $measure->fill(['title' => $data['title'], 'description' => $data['description'], 'responsible_id' => $responsible->id, 'due_on' => $data['due_on'],
                        'contributors' => array_values(array_unique([...$measure->contributors, $actor->id, $responsible->id]))]);
                    if (! $measure->isDirty()) {
                        return $measure;
                    }
                    if (mb_strlen(trim($data['reason'] ?? '')) < 10) {
                        throw ValidationException::withMessages(['reason' => 'Justifique a alteração do plano, prazo ou responsável.']);
                    }
                } elseif (in_array($command, ['progress', 'submit'], true)) {
                    abort_unless($actor->id === $measure->responsible_id && in_array($measure->status, ['open', 'returned'], true), 403);
                    $measure->fill(['result' => $data['result'] ?? '', 'evidence' => $data['evidence'] ?? '']);
                    if ($command === 'submit') {
                        if (trim($measure->result ?? '') === '' || trim($measure->evidence ?? '') === '') {
                            throw ValidationException::withMessages(['evidence' => 'Registe resultado e referência da evidência antes de pedir encerramento.']);
                        }
                        $measure->status = 'review';
                    }
                    if (! $measure->isDirty()) {
                        return $measure;
                    }
                } else {
                    abort_unless(in_array($command, ['close', 'return'], true) && $measure->status === 'review', 409);
                    abort_if(in_array($actor->id, $measure->contributors, true), 403, 'O encerramento exige outra pessoa, independente da preparação e execução.');
                    if (mb_strlen(trim($data['reason'] ?? '')) < 10) {
                        throw ValidationException::withMessages(['reason' => 'Fundamente a decisão sobre a execução.']);
                    }
                    $measure->fill(['status' => $command === 'close' ? 'closed' : 'returned', 'reviewed_by' => $actor->id, 'reviewed_at' => now(), 'review_reason' => $data['reason']]);
                }
                $measure->version++;
                $measure->save();
            }
            $after = $this->snapshot($measure);
            if ($command === 'plan') {
                $after['change_reason'] = $data['reason'];
            }
            app(RequisitionWorkflow::class)->audit($actor, 'supplier_improvement.'.$command, null, $before, $after);

            return $measure;
        });
    }
}