<?php

namespace App\Http\Controllers\Api;

use App\Http\Controllers\Controller;
use App\Models\Spool;
use App\Models\Element;
use App\Models\Joint;
use App\Models\Welder;
use App\Models\WelderAssignment;
use Illuminate\Http\Request;
use Illuminate\Http\JsonResponse;

class PdfmController extends Controller
{
    // Spools CRUD
    public function getSpools(): JsonResponse
    {
        $spools = Spool::orderBy('spool_no')->get();
        return response()->json([
            'success' => true,
            'data' => $spools
        ]);
    }

    public function createSpool(Request $request): JsonResponse
    {
        $request->validate([
            'spool_no' => 'required|string|unique:spools',
            'description' => 'nullable|string',
            'material' => 'nullable|string',
            'diameter' => 'nullable|string',
            'thickness' => 'nullable|string',
            'length' => 'nullable|string',
            'classification' => 'nullable|string'
        ]);

        $spool = Spool::create($request->all());
        return response()->json([
            'success' => true,
            'data' => $spool,
            'message' => 'Spool created successfully!'
        ], 201);
    }

    // Elements CRUD
    public function getElements(): JsonResponse
    {
        $elements = Element::orderBy('element_code')->get();
        return response()->json([
            'success' => true,
            'data' => $elements
        ]);
    }

    public function createElement(Request $request): JsonResponse
    {
        $request->validate([
            'element_code' => 'required|string|unique:elements',
            'element_name' => 'required|string',
            'element_type' => 'required|string',
            'material' => 'nullable|string',
            'diameter' => 'nullable|string',
            'thickness' => 'nullable|string',
            'classification' => 'nullable|string',
            'weight' => 'nullable|numeric'
        ]);

        $element = Element::create($request->all());
        return response()->json([
            'success' => true,
            'data' => $element,
            'message' => 'Element created successfully!'
        ], 201);
    }

    // Joints CRUD
    public function getJoints(): JsonResponse
    {
        $joints = Joint::with(['spool', 'elementFrom', 'elementTo', 'welderAssignments.welder'])
            ->orderBy('joint_no')
            ->get();
        return response()->json([
            'success' => true,
            'data' => $joints
        ]);
    }

    public function createJoint(Request $request): JsonResponse
    {
        $request->validate([
            'joint_no' => 'required|string|unique:joints',
            'spool_no' => 'required|string|exists:spools,spool_no',
            'element_from' => 'nullable|string|exists:elements,element_code',
            'element_to' => 'nullable|string|exists:elements,element_code',
            'joint_type' => 'nullable|string',
            'welding_type' => 'nullable|string',
            'classification' => 'nullable|string'
        ]);

        $joint = Joint::create($request->all());
        return response()->json([
            'success' => true,
            'data' => $joint,
            'message' => 'Joint created successfully!'
        ], 201);
    }

    // Welders CRUD
    public function getWelders(): JsonResponse
    {
        $welders = Welder::orderBy('welder_name')->get();
        return response()->json([
            'success' => true,
            'data' => $welders
        ]);
    }

    public function createWelder(Request $request): JsonResponse
    {
        $request->validate([
            'welder_code' => 'required|string|unique:welders',
            'name' => 'required|string',
            'certification' => 'nullable|string',
            'specialization' => 'nullable|string'
        ]);

        $welder = Welder::create($request->all());
        return response()->json([
            'success' => true,
            'data' => $welder,
            'message' => 'Welder created successfully!'
        ], 201);
    }

    // Welder Assignments
    public function assignWelder(Request $request): JsonResponse
    {
        $request->validate([
            'joint_no' => 'required|string|exists:joints,joint_no',
            'welder_code' => 'required|string|exists:welders,welder_code',
            'assigned_date' => 'nullable|date'
        ]);

        $assignment = WelderAssignment::create($request->all());
        return response()->json([
            'success' => true,
            'data' => $assignment,
            'message' => 'Welder assigned successfully!'
        ], 201);
    }

    // Auto Generate Spool Number
    public function generateSpoolNumber(): JsonResponse
    {
        $lastSpool = Spool::orderBy('id', 'desc')->first();
        $nextNumber = $lastSpool ? (int)substr($lastSpool->spool_no, 3) + 1 : 1;
        $spoolNumber = 'SP-' . str_pad($nextNumber, 3, '0', STR_PAD_LEFT);
        
        // Auto-create the spool in database so it persists
        $spool = Spool::create([
            'spool_no' => $spoolNumber,
            'description' => 'Generated from PDF Editor'
        ]);
        
        return response()->json([
            'success' => true,
            'data' => ['spool_no' => $spoolNumber, 'id' => $spool->id]
        ]);
    }

    // Auto Generate Joint Number
    public function generateJointNumber(Request $request): JsonResponse
    {
        // Make spool_no optional with nullable validation
        $validated = $request->validate(['spool_no' => 'nullable|string']);
        
        $spoolNo = $validated['spool_no'] ?? 'SP-001'; // Default spool if not provided
        
        $lastJoint = Joint::where('spool_no', $spoolNo)
            ->orderBy('id', 'desc')
            ->first();
        
        $nextNumber = $lastJoint ? (int)substr($lastJoint->joint_no, 3) + 1 : 1;
        $jointNumber = 'J-' . str_pad($nextNumber, 3, '0', STR_PAD_LEFT);
        
        // Auto-create the joint in database so it persists
        $joint = Joint::create([
            'joint_no' => $jointNumber,
            'spool_no' => $spoolNo,
            'joint_type' => 'Auto-generated',
            'description' => 'Generated from PDF Editor'
        ]);
        
        return response()->json([
            'success' => true,
            'data' => ['joint_no' => $jointNumber, 'id' => $joint->id]
        ]);
    }
}