<?php

namespace App\Http\Requests\Public;

use App\Models\Application;
use App\Models\Election;
use App\Models\Position;
use App\Models\PusatMengundi;
use App\Services\Public\KtmVacancyService;
use App\Services\RegistrationPeriodService;
use Illuminate\Foundation\Http\FormRequest;
use Illuminate\Validation\Rule;
use Illuminate\Validation\Validator;

class StorePublicApplicationRequest extends FormRequest
{
    public function authorize(): bool
    {
        return true;
    }

    protected function prepareForValidation(): void
    {
        $this->merge([
            'ic_number' => preg_replace('/\D+/', '', (string) $this->input('ic_number')),
            'phone_number' => trim((string) $this->input('phone_number')),
            'bank_account_number' => preg_replace('/[\s-]+/', '', (string) $this->input('bank_account_number')),
        ]);
    }

    /**
     * @return array<string, mixed>
     */
    public function rules(): array
    {
        return [
            'name' => ['required', 'string', 'max:255'],
            'ic_number' => ['required', 'digits:12'],
            'phone_number' => ['required', 'string', 'max:30'],
            'email' => ['nullable', 'email', 'max:255'],
            'address' => ['required', 'string', 'max:1000'],
            'requested_position_code' => ['required', Rule::in(['KTM', 'KP', 'KPDP', 'PAPM'])],
            'selected_ktm_assignment_id' => [
                Rule::requiredIf(fn (): bool => in_array($this->input('requested_position_code'), ['KP', 'KPDP'], true)),
                'nullable',
                'integer',
            ],
            'bank_name' => ['required', 'string', 'max:255'],
            'bank_account_number' => ['required', 'string', 'max:50'],
            'ic_document' => ['required', 'file', 'mimes:pdf,jpg,jpeg,png', 'max:5120'],
            'bank_statement' => ['required', 'file', 'mimes:pdf,jpg,jpeg,png', 'max:5120'],
        ];
    }

    public function after(): array
    {
        return [
            function (Validator $validator): void {
                $pusatMengundi = $this->route('pusatMengundi');

                if (! $pusatMengundi instanceof PusatMengundi) {
                    return;
                }

                /** @var Election $election */
                $election = $pusatMengundi->election()->with('settings')->firstOrFail();

                if (! app(RegistrationPeriodService::class)->isOpen($election)) {
                    $validator->errors()->add('registration', app(RegistrationPeriodService::class)->closedMessage($election));
                }

                $roleCode = (string) $this->input('requested_position_code');
                $position = Position::query()
                    ->where('code', $roleCode)
                    ->where('is_public_applyable', true)
                    ->first();

                if (! $position instanceof Position) {
                    $validator->errors()->add('requested_position_code', 'Jawatan yang dipilih tidak dibuka untuk permohonan awam.');

                    return;
                }

                $this->validateDuplicateIc($validator, $pusatMengundi);

                if (in_array($roleCode, ['KP', 'KPDP'], true)) {
                    $this->validateKtmVacancy($validator, $pusatMengundi, $roleCode);
                }
            },
        ];
    }

    /**
     * @return array<string, string>
     */
    public function attributes(): array
    {
        return [
            'name' => 'nama',
            'ic_number' => 'no. kad pengenalan',
            'phone_number' => 'no. telefon',
            'email' => 'emel',
            'address' => 'alamat',
            'requested_position_code' => 'jawatan dipohon',
            'selected_ktm_assignment_id' => 'KTM',
            'bank_name' => 'nama bank',
            'bank_account_number' => 'no. akaun bank',
            'ic_document' => 'dokumen kad pengenalan',
            'bank_statement' => 'penyata bank',
        ];
    }

    private function validateDuplicateIc(Validator $validator, PusatMengundi $pusatMengundi): void
    {
        // SoftDeletes scope automatically excludes deleted_at IS NOT NULL records (e.g. soft-deleted
        // KTM-created applicants). The whereNotIn further excludes 'cancelled' records (which are
        // NOT soft-deleted) and 'deleted_by_ktm' records as an explicit safety layer.
        $existing = Application::query()
            ->where('election_id', $pusatMengundi->election_id)
            ->where('ic_number', $this->input('ic_number'))
            ->whereNotIn('status', ['cancelled', 'deleted_by_ktm'])
            ->first();

        if (! $existing instanceof Application) {
            return;
        }

        if ($existing->source === 'created_by_ktm') {
            $validator->errors()->add(
                'ic_number',
                'No. kad pengenalan ini telah didaftarkan oleh KTM. KTM perlu memadam rekod tersebut sebelum pemohon boleh mendaftar sendiri.',
            );

            return;
        }

        $validator->errors()->add(
            'ic_number',
            'No. kad pengenalan ini telah mempunyai permohonan untuk pilihanraya semasa.',
        );
    }

    private function validateKtmVacancy(Validator $validator, PusatMengundi $pusatMengundi, string $roleCode): void
    {
        $assignmentId = (int) $this->input('selected_ktm_assignment_id');

        if ($assignmentId <= 0) {
            return;
        }

        if (! app(KtmVacancyService::class)->hasVacancyForAssignment($assignmentId, $pusatMengundi, $roleCode)) {
            $validator->errors()->add(
                'selected_ktm_assignment_id',
                'KTM yang dipilih tidak sah atau kekosongan untuk jawatan ini telah penuh.',
            );
        }
    }
}