<?php

namespace App\Http\Controllers;

use App\Models\Documents\Document;
use App\Models\DocumentTemplate;
use App\Models\Items\Item;
use Illuminate\Http\Request;
use Illuminate\Http\Response;
use Illuminate\Support\Facades\DB;
use Illuminate\View\View;

class DocumentController extends Controller
{
    /**
     * 문서 목록 페이지
     */
    public function index(Request $request): View|Response
    {
        if ($request->header('HX-Request')) {
            return response('', 200)->header('HX-Redirect', route('documents.index'));
        }

        $tenantId = session('selected_tenant_id');

        // 템플릿 목록 (필터용)
        $templates = $tenantId
            ? DocumentTemplate::where(function ($q) use ($tenantId) {
                $q->whereNull('tenant_id')->orWhere('tenant_id', $tenantId);
            })->where('is_active', true)->orderBy('name')->get()
            : collect();

        return view('documents.index', [
            'templates' => $templates,
            'statuses' => Document::STATUS_LABELS,
        ]);
    }

    /**
     * 문서 생성 페이지
     */
    public function create(Request $request): View|Response
    {
        if ($request->header('HX-Request')) {
            return response('', 200)->header('HX-Redirect', route('documents.create', $request->query()));
        }

        $tenantId = session('selected_tenant_id');
        $templateId = $request->query('template_id');

        // 템플릿 목록
        $templates = $tenantId
            ? DocumentTemplate::where(function ($q) use ($tenantId) {
                $q->whereNull('tenant_id')->orWhere('tenant_id', $tenantId);
            })->where('is_active', true)->orderBy('name')->get()
            : collect();

        // 선택된 템플릿
        $template = $templateId
            ? DocumentTemplate::with(['approvalLines', 'basicFields', 'sections.items', 'columns', 'sectionFields', 'links.linkValues'])->find($templateId)
            : null;

        return view('documents.edit', [
            'document' => null,
            'template' => $template,
            'templates' => $templates,
            'isCreate' => true,
            'linkedItemSpecs' => $template ? $this->getLinkedItemSpecs($template) : [],
        ]);
    }

    /**
     * 문서 수정 페이지
     */
    public function edit(int $id): View|Response
    {
        if (request()->header('HX-Request')) {
            return response('', 200)->header('HX-Redirect', route('documents.edit', $id));
        }

        $tenantId = session('selected_tenant_id');

        $document = Document::with([
            'template.approvalLines',
            'template.basicFields',
            'template.sections.items',
            'template.columns',
            'template.sectionFields',
            'template.links.linkValues',
            'approvals.user',
            'data',
            'attachments.file',
            'creator',
        ])->where('tenant_id', $tenantId)->findOrFail($id);

        // 템플릿 목록 (변경용)
        $templates = $tenantId
            ? DocumentTemplate::where(function ($q) use ($tenantId) {
                $q->whereNull('tenant_id')->orWhere('tenant_id', $tenantId);
            })->where('is_active', true)->orderBy('name')->get()
            : collect();

        return view('documents.edit', [
            'document' => $document,
            'template' => $document->template,
            'templates' => $templates,
            'isCreate' => false,
            'linkedItemSpecs' => $this->getLinkedItemSpecs($document->template),
        ]);
    }

    /**
     * 문서 인쇄용 화면 (성적서 양식)
     */
    public function print(int $id): View
    {
        $tenantId = session('selected_tenant_id');

        $document = Document::with([
            'template.approvalLines',
            'template.basicFields',
            'template.sections.items',
            'template.columns',
            'template.sectionFields',
            'template.links.linkValues',
            'approvals.user',
            'data',
            'creator',
        ])->where('tenant_id', $tenantId)->findOrFail($id);

        return view('documents.print', [
            'document' => $document,
        ]);
    }

    /**
     * 문서 상세 페이지 (읽기 전용)
     */
    public function show(int $id): View
    {
        $tenantId = session('selected_tenant_id');

        $document = Document::with([
            'template.approvalLines',
            'template.basicFields',
            'template.sections.items',
            'template.columns',
            'template.sectionFields',
            'template.links.linkValues',
            'approvals.user',
            'data',
            'attachments.file',
            'creator',
            'updater',
        ])->where('tenant_id', $tenantId)->findOrFail($id);

        return view('documents.show', [
            'document' => $document,
        ]);
    }

    /**
     * 템플릿에 연결된 품목들의 규격 정보 (thickness, width, length) 조회
     */
    private function getLinkedItemSpecs(DocumentTemplate $template): array
    {
        $specs = [];

        if (! $template->relationLoaded('links')) {
            $template->load('links.linkValues');
        }

        foreach ($template->links as $link) {
            if ($link->source_table !== 'items') {
                continue;
            }

            foreach ($link->linkValues as $lv) {
                $item = Item::find($lv->linkable_id);
                if (! $item) {
                    continue;
                }

                $attrs = $item->attributes ?? [];
                if (isset($attrs['thickness']) || isset($attrs['width']) || isset($attrs['length'])) {
                    $specs[] = [
                        'id' => $item->id,
                        'name' => $item->name,
                        'thickness' => $attrs['thickness'] ?? null,
                        'width' => $attrs['width'] ?? null,
                        'length' => $attrs['length'] ?? null,
                    ];
                }
            }
        }

        return $specs;
    }
}