<?php

namespace App\Http\Controllers\Api;

use App\Http\Controllers\Controller;
use App\Models\LeaveApplication;
use App\Models\User;
use App\Services\EmployeeService;
use App\Services\LeaveService;
use Illuminate\Http\Request;
use Exception;

class LeaveApiController extends Controller
{
    protected EmployeeService $employeeService;
    protected LeaveService $leaveService;

    public function __construct(EmployeeService $employeeService, LeaveService $leaveService)
    {
        $this->employeeService = $employeeService;
        $this->leaveService = $leaveService;
    }

    public function balances(Request $request)
    {
        try {
            $employee = $this->employeeService->resolveEmployee($request->user());
        } catch (Exception $e) {
            return response()->json([
                'success' => false,
                'data' => [],
                'message' => 'Employee profile not found',
                'errors' => null,
            ], 403);
        }

        $balances = $this->leaveService->getBalances($employee);

        return response()->json([
            'success' => true,
            'data' => $balances,
            'message' => null,
            'errors' => null,
        ]);
    }

    public function applications(Request $request)
    {
        try {
            $employee = $this->employeeService->resolveEmployee($request->user());
        } catch (Exception $e) {
            return response()->json([
                'success' => false,
                'data' => [],
                'message' => 'Employee profile not found',
                'errors' => null,
            ], 403);
        }

        $applications = LeaveApplication::where('employee_id', $request->user()->id)
            ->orderBy('created_at', 'desc')
            ->get();

        return response()->json([
            'success' => true,
            'data' => $applications,
            'message' => null,
            'errors' => null,
        ]);
    }

    public function apply(Request $request)
    {
        $request->validate([
            'leave_type' => 'nullable|string',
            'leave_type_id' => 'nullable|integer',
            'start_date' => 'required|date',
            'end_date' => 'required|date|after_or_equal:start_date',
            'reason' => 'required|string',
        ]);

        try {
            $employee = $this->employeeService->resolveEmployee($request->user());
        } catch (Exception $e) {
            return response()->json([
                'success' => false,
                'data' => null,
                'message' => 'Employee profile not found',
                'errors' => null,
            ], 403);
        }

        $application = $this->leaveService->submitApplication($request->user(), $employee, $request->all());

        return response()->json([
            'success' => true,
            'message' => 'Leave application submitted successfully',
            'data' => $application,
            'errors' => null,
        ], 201);
    }

    public function updateStatus(Request $request, $id)
    {
        $request->validate([
            'status' => 'required|string|in:approved,rejected,cancelled,pending',
        ]);

        $user = $request->user();
        $application = LeaveApplication::find($id);

        if (!$application) {
            return response()->json([
                'success' => false,
                'data' => null,
                'message' => 'Leave application not found',
                'errors' => null,
            ], 404);
        }

        $employee = $this->employeeService->resolveEmployee($user);

        // Scoping & authorization checks
        if ($request->status === 'cancelled') {
            $isOwner = in_array($application->employee_id, [$employee->id, $user->id]) || $application->created_by === $user->id;
            if (!$isOwner && !in_array($user->type, ['company', 'hr', 'superadmin', 'manager'])) {
                return response()->json([
                    'success' => false,
                    'data' => null,
                    'message' => 'Unauthorized to cancel this leave application',
                    'errors' => null,
                ], 403);
            }
        } else {
            // Approval or Rejection requires manager / HR role within same company tenant
            $userType = strtolower($user->type ?? '');
            $isElevatedRole = in_array($userType, ['company', 'hr', 'superadmin', 'manager']);

            if (!$isElevatedRole) {
                try {
                    $isElevatedRole = $user->hasAnyRole(['company', 'hr', 'superadmin', 'manager']);
                } catch (\Throwable $e) {
                    $isElevatedRole = false;
                }
            }

            $empUser = User::find($application->employee_id) 
                ?? Employee::find($application->employee_id)?->user 
                ?? User::find($application->created_by);

            $appCompanyId = $empUser ? ($empUser->type === 'company' ? $empUser->id : ($empUser->created_by ?: $empUser->id)) : null;
            $approverCompanyId = $user->type === 'company' ? $user->id : ($user->created_by ?: $user->id);

            $isSuperAdmin = in_array($userType, ['superadmin']);
            $isSameCompany = ($appCompanyId !== null && $approverCompanyId !== null && (int)$appCompanyId === (int)$approverCompanyId);

            if (!$isElevatedRole || (!$isSameCompany && !$isSuperAdmin)) {
                return response()->json([
                    'success' => false,
                    'data' => null,
                    'message' => 'Unauthorized to review this leave application. Approval requires authorized manager or HR within the same organization.',
                    'errors' => null,
                ], 403);
            }
        }

        $application->update(['status' => $request->status]);

        return response()->json([
            'success' => true,
            'message' => 'Leave application status updated to ' . $request->status,
            'data' => $application,
            'errors' => null,
        ]);
    }

    public function cancel(Request $request, $id)
    {
        return $this->updateStatus($request->merge(['status' => 'cancelled']), $id);
    }
}