<?php

namespace App\Http\Controllers\Purchase;

use App\Http\Controllers\Controller;
use App\Models\PurchaseRequest;
use App\Models\PurchaseRequestItem;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;

class PurchaseRequestController extends Controller
{
    public function index()
    {
        return redirect()->route('purchase.pipeline.index');
    }

    public function create()
    {
        return view('purchase.requests.create');
    }

    public function store(Request $request)
    {
        $request->validate([
            'date'                          => 'required|date',
            'project_name'                  => 'required|string|max:255',
            'department'                    => 'nullable|string|max:255',
            'requested_by_name'             => 'required|string|max:255',
            'required_date_text'            => 'nullable|string|max:100',
            'location'                      => 'nullable|string|max:255',
            'remarks'                       => 'nullable|string',
            'items'                         => 'required|array|min:1',
            'items.*.description'           => 'required|string',
            'items.*.unit'                  => 'nullable|string|max:50',
            'items.*.quantity_required'     => 'required|numeric|min:0.01',
            'items.*.purpose_use'           => 'nullable|string|max:255',
            'items.*.required_date'         => 'nullable|date',
        ]);

        DB::transaction(function () use ($request) {
            $year = now()->format('y');
            $next = PurchaseRequest::max('id') + 1;
            $mprNumber = 'MPR' . $year . '-' . str_pad($next, 4, '0', STR_PAD_LEFT);

            $pr = PurchaseRequest::create([
                'request_number'     => $mprNumber,
                'date'               => $request->date,
                'project_name'       => $request->project_name,
                'department'         => $request->department,
                'requested_by_name'  => $request->requested_by_name,
                'required_date_text' => $request->required_date_text,
                'location'           => $request->location,
                'remarks'            => $request->remarks,
                'status'             => 'pending',
                'requested_by'       => auth()->id(),
            ]);

            foreach ($request->items as $item) {
                if (empty(trim($item['description']))) {
                    continue;
                }
                PurchaseRequestItem::create([
                    'purchase_request_id' => $pr->id,
                    'description'         => $item['description'],
                    'unit'                => $item['unit'] ?? null,
                    'quantity_required'   => $item['quantity_required'],
                    'purpose_use'         => $item['purpose_use'] ?? null,
                    'required_date'       => $item['required_date'] ?? null,
                ]);
            }
        });

        return redirect()->route('purchase.requests.index')->with('success', 'Purchase request submitted successfully.');
    }

    public function show(PurchaseRequest $purchaseRequest)
    {
        $purchaseRequest->load(['items', 'requestedBy', 'approvedBy']);

        return view('purchase.requests.show', compact('purchaseRequest'));
    }

    public function edit(PurchaseRequest $purchaseRequest)
    {
        $purchaseRequest->load('items');

        return view('purchase.requests.edit', compact('purchaseRequest'));
    }

    public function update(Request $request, PurchaseRequest $purchaseRequest)
    {
        $request->validate([
            'date'                          => 'required|date',
            'project_name'                  => 'required|string|max:255',
            'department'                    => 'nullable|string|max:255',
            'requested_by_name'             => 'required|string|max:255',
            'required_date_text'            => 'nullable|string|max:100',
            'location'                      => 'nullable|string|max:255',
            'remarks'                       => 'nullable|string',
            'items'                         => 'required|array|min:1',
            'items.*.description'           => 'required|string',
            'items.*.unit'                  => 'nullable|string|max:50',
            'items.*.quantity_required'     => 'required|numeric|min:0.01',
            'items.*.purpose_use'           => 'nullable|string|max:255',
            'items.*.required_date'         => 'nullable|date',
        ]);

        DB::transaction(function () use ($request, $purchaseRequest) {
            $purchaseRequest->update([
                'date'               => $request->date,
                'project_name'       => $request->project_name,
                'department'         => $request->department,
                'requested_by_name'  => $request->requested_by_name,
                'required_date_text' => $request->required_date_text,
                'location'           => $request->location,
                'remarks'            => $request->remarks,
            ]);

            $purchaseRequest->items()->delete();

            foreach ($request->items as $item) {
                if (empty(trim($item['description']))) {
                    continue;
                }
                PurchaseRequestItem::create([
                    'purchase_request_id' => $purchaseRequest->id,
                    'description'         => $item['description'],
                    'unit'                => $item['unit'] ?? null,
                    'quantity_required'   => $item['quantity_required'],
                    'purpose_use'         => $item['purpose_use'] ?? null,
                    'required_date'       => $item['required_date'] ?? null,
                ]);
            }
        });

        return redirect()->route('purchase.requests.show', $purchaseRequest)->with('success', 'Purchase request updated successfully.');
    }

    public function destroy(PurchaseRequest $purchaseRequest)
    {
        $purchaseRequest->delete();

        return redirect()->route('purchase.requests.index')->with('success', 'Purchase request deleted.');
    }

    public function approve(PurchaseRequest $purchaseRequest)
    {
        $purchaseRequest->update([
            'status'      => 'approved',
            'approved_by' => auth()->id(),
            'approved_at' => now(),
        ]);

        return redirect()->back()->with('success', 'Purchase request approved.');
    }

    public function reject(PurchaseRequest $purchaseRequest)
    {
        $purchaseRequest->update(['status' => 'rejected']);

        return redirect()->back()->with('success', 'Purchase request rejected.');
    }

    public function print(PurchaseRequest $purchaseRequest)
    {
        $purchaseRequest->load(['items', 'requestedBy', 'approvedBy']);

        return view('purchase.requests.print', compact('purchaseRequest'));
    }
}