<?php

namespace App\Http\Controllers;

use App\Enums\PurchasingRole;
use App\Models\AdmissionAdoption;
use App\Models\AdmissionDecision;
use App\Models\AdmissionPolicy;
use App\Models\AdmissionReview;
use App\Models\PurchaseAward;
use App\Models\Requisition;
use App\Services\ConflictGuard;
use App\Services\FormalAdmission;
use App\Services\ProposalOpeningWorkflow;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Inertia\Inertia;
use Symfony\Component\HttpFoundation\Response;

class FormalAdmissionController extends Controller
{
    private function access(Request $request, int $id): Requisition
    {
        abort_unless(in_array($request->user()->purchasing_role, [PurchasingRole::Admin, PurchasingRole::Procurement, PurchasingRole::Finance, PurchasingRole::DepartmentHead]), 403);

        return Requisition::query()->visibleTo($request->user())->findOrFail($id);
    }

    public function policy(Request $request): Response
    {
        abort_unless($request->user()->purchasing_role === PurchasingRole::Admin, 403);
        Inertia::encryptHistory();
        $response = Inertia::render('purchases/admission-policy', ['policies' => AdmissionPolicy::query()->latest('revision')->paginate(20)->withQueryString(), 'latest' => AdmissionPolicy::query()->latest('revision')->first()])->toResponse($request);
        $response->headers->set('Cache-Control', 'private, no-store, max-age=0');

        return $response;
    }

    public function configure(Request $request, FormalAdmission $workflow): RedirectResponse
    {
        $data = $request->validate(['previous_id' => 'required|integer|min:0', 'enabled' => 'required|boolean', 'roles' => 'required|array|min:1|max:2', 'roles.*' => 'required|distinct|in:finance,department_head', 'required_count' => 'required|integer|min:1|max:50', 'reason' => 'required|string|min:10|max:4000', 'tenant_id' => 'prohibited', 'created_by' => 'prohibited', 'snapshot' => 'prohibited']);
        $data['enabled'] = (bool) $data['enabled'];
        $workflow->policy($request->user(), $data);

        return to_route('admissions.policy');
    }

    public function show(Request $request, Requisition $requisition, FormalAdmission $workflow, ProposalOpeningWorkflow $opening): Response
    {
        $requisition = $this->access($request, $requisition->id);
        $filter = $request->validate(['version' => 'nullable|integer|min:1']);
        $adoption = $workflow->adoption($requisition);
        $selected = isset($filter['version']) ? AdmissionAdoption::query()->where('requisition_id', $requisition->id)->findOrFail((int) $filter['version']) : $adoption;
        $current = $selected && $selected->id === $adoption?->id;
        $closed = $requisition->status !== 'approved' || PurchaseAward::query()->where('requisition_id', $requisition->id)->exists();
        $open = ! $closed && ! app(ConflictGuard::class)->participationBlocked($request->user(), $requisition);
        $decisions = AdmissionDecision::query()->where('admission_adoption_id', $selected->id ?? 0)->latest('id')->get();
        $latestIds = $decisions->unique('quotation_id')->pluck('id');
        $proposals = collect($opening->proposals($requisition))->map(function ($quote) use ($workflow, $requisition, $decisions) {
            $basis = $workflow->basis($requisition, $quote['id']);

            return [...$quote, 'basisHash' => $basis['hash'] ?? null, 'clear' => $basis['clear'] ?? false, 'previousId' => $decisions->firstWhere('quotation_id', $quote['id'])->id ?? 0];
        });
        $history = AdmissionDecision::query()->where('admission_adoption_id', $selected->id ?? 0)->latest('id')->paginate(15)->withQueryString();
        $history->through(function ($decision) use ($workflow, $selected, $current, $latestIds, $requisition, $open, $request) {
            $basis = $workflow->basis($requisition, $decision->quotation_id);
            $fresh = $current && $latestIds->contains($decision->id) && $basis && $basis['hash'] === $decision->basis_hash;

            return [...$decision->toArray(), 'status' => $workflow->status($decision, $selected), 'current' => (bool) $fresh,
                'reviews' => AdmissionReview::query()->where('admission_decision_id', $decision->id)->orderBy('id')->get(),
                'canReview' => $open && $fresh && $workflow->status($decision, $selected) === 'pending' && $workflow->eligible($request->user(), $requisition, $selected, $decision) && ! AdmissionReview::query()->where('admission_decision_id', $decision->id)->where('reviewed_by', $request->user()->id)->exists()];
        });
        Inertia::encryptHistory();
        $response = Inertia::render('purchases/admission', ['requisition' => $requisition->only(['id', 'number']), 'policy' => AdmissionPolicy::query()->latest('revision')->first(), 'adoptions' => AdmissionAdoption::query()->where('requisition_id', $requisition->id)->latest('revision')->get(), 'adoption' => $adoption, 'selected' => $selected, 'proposals' => $proposals, 'history' => $history, 'canAdopt' => $open && $request->user()->purchasing_role === PurchasingRole::Procurement, 'canPropose' => $open && $current && $request->user()->purchasing_role === PurchasingRole::Procurement && $request->user()->id !== $requisition->requester_id, 'closed' => $closed])->toResponse($request);
        $response->headers->set('Cache-Control', 'private, no-store, max-age=0');

        return $response;
    }

    public function adopt(Request $request, Requisition $requisition, FormalAdmission $workflow): RedirectResponse
    {
        $this->access($request, $requisition->id);
        $data = $request->validate(['policy_id' => 'required|integer', 'previous_id' => 'required|integer|min:0', 'reason' => 'required|string|min:10|max:4000', 'tenant_id' => 'prohibited', 'snapshot' => 'prohibited', 'created_by' => 'prohibited']);
        $workflow->adopt($request->user(), $requisition, (int) $data['policy_id'], (int) $data['previous_id'], $data['reason']);

        return to_route('admissions.show', $requisition);
    }

    public function propose(Request $request, Requisition $requisition, FormalAdmission $workflow): RedirectResponse
    {
        $this->access($request, $requisition->id);
        $data = $request->validate(['quotation_id' => 'required|integer', 'previous_id' => 'required|integer|min:0', 'basis_hash' => 'required|string|size:64', 'outcome' => 'required|in:admit,exclude,clarify', 'reason' => 'required|string|min:10|max:4000', 'tenant_id' => 'prohibited', 'created_by' => 'prohibited', 'snapshot' => 'prohibited', 'status' => 'prohibited']);
        $workflow->propose($request->user(), $requisition, $data);

        return to_route('admissions.show', $requisition);
    }

    public function review(Request $request, AdmissionDecision $decision, FormalAdmission $workflow): RedirectResponse
    {
        $adoption = AdmissionAdoption::query()->findOrFail($decision->admission_adoption_id);
        $this->access($request, $adoption->requisition_id);
        $data = $request->validate(['verdict' => 'required|in:approved,returned', 'reason' => 'required|string|min:10|max:4000', 'reviewed_by' => 'prohibited', 'snapshot' => 'prohibited', 'tenant_id' => 'prohibited']);
        $workflow->review($request->user(), $decision, $data['verdict'], $data['reason']);

        return to_route('admissions.show', $adoption->requisition_id);
    }
}