<?php

namespace App\Http\Controllers;

use App\Models\ChecklistFormula;
use App\Models\ChecklistItem;
use App\Models\ChecklistScope;
use App\Models\ChecklistSection;
use App\Models\ChecklistTemplate;
use Illuminate\Http\Request;

/**
 * Mengurus elemen bersarang templat senarai semak (seksyen, skop, item, formula).
 * Semua tindakan memerlukan kebenaran 'templat.urus'.
 */
class ChecklistBuilderController extends Controller
{
    // Kebenaran 'templat.urus' dikuatkuasakan pada peringkat laluan (route group).

    // ---------------- Seksyen ----------------
    public function storeSection(Request $request, ChecklistTemplate $template)
    {
        $data = $this->validateSection($request);
        $template->sections()->create($data);

        return back()->with('success', 'Seksyen ditambah.');
    }

    public function updateSection(Request $request, ChecklistSection $section)
    {
        $section->update($this->validateSection($request));

        return back()->with('success', 'Seksyen dikemas kini.');
    }

    public function destroySection(ChecklistSection $section)
    {
        $section->delete();

        return back()->with('success', 'Seksyen dipadam.');
    }

    protected function validateSection(Request $request): array
    {
        $data = $request->validate([
            'code' => ['required', 'string', 'max:50'],
            'title' => ['required', 'string', 'max:255'],
            'description' => ['nullable', 'string', 'max:1000'],
            'order' => ['nullable', 'integer', 'min:0'],
            'is_formula_enabled' => ['nullable', 'boolean'],
        ]);
        $data['is_formula_enabled'] = $request->boolean('is_formula_enabled');
        $data['order'] ??= 0;

        return $data;
    }

    // ---------------- Skop ----------------
    public function storeScope(Request $request, ChecklistSection $section)
    {
        $section->scopes()->create($this->validateScope($request));

        return back()->with('success', 'Skop ditambah.');
    }

    public function updateScope(Request $request, ChecklistScope $scope)
    {
        $scope->update($this->validateScope($request));

        return back()->with('success', 'Skop dikemas kini.');
    }

    public function destroyScope(ChecklistScope $scope)
    {
        $scope->delete();

        return back()->with('success', 'Skop dipadam.');
    }

    protected function validateScope(Request $request): array
    {
        $data = $request->validate([
            'code' => ['required', 'string', 'max:50'],
            'title' => ['required', 'string', 'max:255'],
            'description' => ['nullable', 'string', 'max:1000'],
            'order' => ['nullable', 'integer', 'min:0'],
        ]);
        $data['order'] ??= 0;

        return $data;
    }

    // ---------------- Item ----------------
    public function storeItem(Request $request, ChecklistSection $section)
    {
        $data = $this->validateItem($request);
        $section->items()->create($data);

        return back()->with('success', 'Item ditambah.');
    }

    public function updateItem(Request $request, ChecklistItem $item)
    {
        $item->update($this->validateItem($request));

        return back()->with('success', 'Item dikemas kini.');
    }

    public function destroyItem(ChecklistItem $item)
    {
        $item->delete();

        return back()->with('success', 'Item dipadam.');
    }

    protected function validateItem(Request $request): array
    {
        $data = $request->validate([
            'checklist_scope_id' => ['nullable', 'exists:checklist_scopes,id'],
            'code' => ['required', 'string', 'max:50'],
            'formula_token' => ['nullable', 'string', 'max:50', 'regex:/^[A-Za-z_][A-Za-z0-9_]*$/'],
            'label' => ['required', 'string', 'max:500'],
            'description' => ['nullable', 'string', 'max:1000'],
            'input_type' => ['required', 'in:'.implode(',', array_keys(ChecklistItem::INPUT_TYPES))],
            'options' => ['nullable', 'string'],
            'unit' => ['nullable', 'string', 'max:50'],
            'is_required' => ['nullable', 'boolean'],
            'is_calculated' => ['nullable', 'boolean'],
            'formula' => ['nullable', 'string', 'max:500'],
            'order' => ['nullable', 'integer', 'min:0'],
        ], [], ['formula_token' => 'token formula']);

        $data['is_required'] = $request->boolean('is_required');
        $data['is_calculated'] = $request->boolean('is_calculated');
        $data['order'] ??= 0;

        // Tukar senarai pilihan (satu baris satu pilihan) kepada array.
        if (! empty($data['options'])) {
            $data['options'] = collect(preg_split('/\r\n|\r|\n/', $data['options']))
                ->map(fn ($v) => trim($v))->filter()->values()->all();
        } else {
            $data['options'] = null;
        }

        return $data;
    }

    // ---------------- Formula ----------------
    public function storeFormula(Request $request, ChecklistTemplate $template)
    {
        $data = $this->validateFormula($request);
        $template->formulas()->create($data);

        return back()->with('success', 'Formula ditambah.');
    }

    public function updateFormula(Request $request, ChecklistFormula $formula)
    {
        $formula->update($this->validateFormula($request));

        return back()->with('success', 'Formula dikemas kini.');
    }

    public function destroyFormula(ChecklistFormula $formula)
    {
        $formula->delete();

        return back()->with('success', 'Formula dipadam.');
    }

    protected function validateFormula(Request $request): array
    {
        $data = $request->validate([
            'checklist_section_id' => ['nullable', 'exists:checklist_sections,id'],
            'result_token' => ['required', 'string', 'max:50', 'regex:/^[A-Za-z_][A-Za-z0-9_]*$/'],
            'label' => ['nullable', 'string', 'max:255'],
            'expression' => ['required', 'string', 'max:500'],
            'unit' => ['nullable', 'string', 'max:50'],
            'guard_div_zero' => ['nullable', 'boolean'],
            'order' => ['nullable', 'integer', 'min:0'],
        ], [], ['result_token' => 'token hasil', 'expression' => 'ungkapan']);

        $data['guard_div_zero'] = $request->boolean('guard_div_zero');
        $data['order'] ??= 0;

        return $data;
    }
}