<?php

namespace App\Http\Controllers;

use App\Models\EducationInvestmentProposal;
use App\Models\LabourDemand;
use App\Models\Opportunity;
use App\Services\InvestmentGeography;
use App\Services\PortalAudit;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Str;
use Illuminate\Validation\Rule;
use LogicException;

class EducationInvestmentController extends Controller
{
    public function store(Request $request, string $id): RedirectResponse
    {
        $data = $request->validate([
            'demand_version' => ['required', 'integer', 'min:1'],
            'sector_id' => ['required', 'integer', Rule::exists('sectors', 'id')->whereNull('deleted_at')],
            'title' => ['required', 'string', 'max:200'],
            'intervention' => ['required', 'string', 'min:20', 'max:10000'],
            'equipment_needs' => ['nullable', 'string', 'max:5000'],
            'trainer_needs' => ['nullable', 'string', 'max:5000'],
            'funding_plan' => ['nullable', 'string', 'max:5000'],
            'risks' => ['required', 'string', 'min:10', 'max:5000'],
            'source' => ['required', 'string', 'min:10', 'max:5000'],
            'currency' => ['required', Rule::in(['MZN', 'USD', 'EUR', 'ZAR'])],
            'province_id' => ['required', 'uuid'],
            'district_id' => ['nullable', 'uuid'],
            'admin_post_id' => ['nullable', 'uuid'],
            'locality_id' => ['nullable', 'uuid'],
        ]);

        DB::transaction(function () use ($request, $id, $data): void {
            $demand = LabourDemand::whereKey($id)->lockForUpdate()->firstOrFail();
            abort_unless((int) $demand->getAttribute('version_no') === $data['demand_version'], 409, 'A procura foi alterada. Recarregue a análise.');
            abort_unless($demand->getAttribute('status') === 'reviewed' && $demand->getAttribute('valid_until') >= now()->toDateString(),
                422, 'A proposta exige procura revista e fonte vigente.');
            // Serialising on the demand and unique FKs make repeated submissions safe.
            if (EducationInvestmentProposal::withTrashed()->where('labour_demand_id', $id)->exists()) {
                return;
            }
            $territory = app(InvestmentGeography::class)->selection($data, true);
            $lastTerritoryKey = array_key_last($territory);
            if ($lastTerritoryKey === null) {
                throw new LogicException('A proposta educativa exige uma localização territorial.');
            }
            $province = $territory[0];
            $district = $territory[1] ?? null;
            $primaryTerritory = $territory[$lastTerritoryKey];
            $reference = 'EDU-'.Str::uuid();
            $opportunity = new Opportunity;
            PortalAudit::save($opportunity, [
                'sector_id' => $data['sector_id'], 'reference' => $reference,
                'slug' => strtolower($reference), 'title' => $data['title'],
                'summary' => 'Proposta educativa em preparação. Lacuna e viabilidade pendentes de validação institucional.',
                'description' => $data['intervention'], 'estimated_investment_currency' => $data['currency'],
                'province' => $province->name, 'district' => $district?->name,
                'primary_territory_id' => $primaryTerritory->id, 'territory_version' => 1,
                'status' => 'draft', 'is_featured' => false,
            ], $request->user()->id);
            PortalAudit::save(new EducationInvestmentProposal, [
                'labour_demand_id' => $id, 'demand_version' => $data['demand_version'],
                'opportunity_id' => $opportunity->id, 'created_by' => $request->user()->id,
                ...array_intersect_key($data, array_flip(['intervention', 'equipment_needs', 'trainer_needs', 'funding_plan', 'risks', 'source'])),
            ], $request->user()->id);
        });

        return redirect('/management/education/demands/'.$id.'/analysis')
            ->with('success', 'Ficha educativa guardada em rascunho. Publicação sujeita a validação institucional.');
    }
}