<?php

namespace App\Http\Controllers;

use App\Enums\PurchasingRole;
use App\Models\Budget;
use App\Models\BudgetConsumption;
use App\Models\BudgetEntry;
use App\Models\BudgetReinforcement;
use App\Models\CostCenter;
use App\Services\ConflictGuard;
use App\Services\CurrentActor;
use App\Services\RequisitionWorkflow;
use Brick\Math\BigDecimal;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;
use Illuminate\Validation\Rule;
use Inertia\Inertia;
use Inertia\Response;

class BudgetController extends Controller
{
    private function access(Request $request): void
    {
        abort_unless(in_array($request->user()->purchasing_role, [PurchasingRole::Admin, PurchasingRole::Finance]), 403);
    }

    public function index(Request $request): Response
    {
        $this->access($request);

        return Inertia::render('budgets/index', ['centers' => CostCenter::query()->orderBy('code')->get(), 'budgets' => Budget::query()->latest('id')->get()->map(function (Budget $budget) {
            $entries = BudgetEntry::query()->where('budget_id', $budget->id);
            $reserved = (int) (clone $entries)->sum('reserved_minor');
            $committed = (int) $entries->sum('committed_minor');
            $consumed = (int) BudgetConsumption::query()->where('budget_id', $budget->id)->sum('amount_minor');

            $total = $budget->approvedTotalMinor();

            return [...$budget->toArray(), 'reinforced_minor' => $total - $budget->amount_minor, 'approved_total_minor' => $budget->approved_by ? $total : 0, 'reserved_minor' => $reserved, 'committed_minor' => $committed, 'consumed_minor' => $consumed, 'available_minor' => $budget->approved_by ? $total - $reserved - $committed - $consumed : 0];
        }), 'reinforcements' => BudgetReinforcement::query()->latest('id')->paginate(20)]);
    }

    public function store(Request $request): RedirectResponse
    {
        $this->access($request);
        $data = $request->validate(['cost_center_id' => ['required', 'integer', Rule::exists('cost_centers', 'id')->where('tenant_id', $request->user()->tenant_id)], 'year' => 'required|integer|min:2026|max:2100', 'includes_tax' => 'required|boolean', 'amount' => ['required', 'regex:/^\d{1,12}(\.\d{1,2})?$/'], 'reason' => 'required|string|max:4000']);
        $kind = $request->validate(['kind' => ['sometimes', Rule::in(['operating', 'investment'])]])['kind'] ?? 'operating';
        DB::transaction(function () use ($request, $data, $kind) {
            app(ConflictGuard::class)->lockCompany($request->user());
            app(CurrentActor::class)->lock($request->user(), [PurchasingRole::Admin, PurchasingRole::Finance]);
            abort_if(Budget::query()->where('cost_center_id', $data['cost_center_id'])->where('year', $data['year'])->exists(), 409, 'Já existe dotação para este centro e exercício.');
            $budget = Budget::query()->create(['tenant_id' => $request->user()->tenant_id, 'created_by' => $request->user()->id, 'cost_center_id' => $data['cost_center_id'], 'year' => $data['year'], 'kind' => $kind, 'includes_tax' => $data['includes_tax'], 'amount_minor' => BigDecimal::of($data['amount'])->multipliedBy(100)->toInt(), 'reason' => $data['reason']]);
            app(RequisitionWorkflow::class)->audit($request->user(), 'budget.created', null, null, $budget->toArray());
        });

        return back();
    }

    public function approve(Request $request, Budget $budget): RedirectResponse
    {
        $this->access($request);
        DB::transaction(function () use ($request, $budget) {
            app(ConflictGuard::class)->lockCompany($request->user());
            app(CurrentActor::class)->lock($request->user(), [PurchasingRole::Admin, PurchasingRole::Finance]);
            $budget = Budget::query()->lockForUpdate()->findOrFail($budget->id);
            abort_if($budget->created_by === $request->user()->id, 403);
            if ($budget->approved_by) {
                return;
            }
            $budget->update(['approved_by' => $request->user()->id, 'approved_at' => now()]);
            app(RequisitionWorkflow::class)->audit($request->user(), 'budget.approved', null, null, $budget->toArray());
        });

        return back();
    }
}