<?php

namespace App\Http\Controllers;

use App\Models\Branch;
use App\Models\BranchDocument;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Storage;

class BranchController extends Controller
{
    public function index(Request $request)
    {
        $query = Branch::with('documents');
        if ($request->has('status')) {
            $query->where('status', $request->status);
        }
        $branches = $query->get();

        // Attach is_deletable flag to each branch
        $branches->each(function ($branch) {
            $inUse = \App\Models\Staff::where('branch_id', $branch->id)->exists()
                || \App\Models\Product::where('branch_id', $branch->id)->exists()
                || \App\Models\Expense::where('branch_id', $branch->id)->exists()
                || \App\Models\Collection::where('branch_id', $branch->id)->exists()
                || \App\Models\Account::where('branch_id', $branch->id)->exists()
                || \App\Models\ProductSale::where('branch_id', $branch->id)->exists()
                || \App\Models\Receptionist::where('branch_id', $branch->id)->exists();
            $branch->is_deletable = !$inUse;
        });

        return response()->json($branches);
    }

    public function store(Request $request)
    {
        $validated = $request->validate([
            'name' => 'required|string',
            'location' => 'required|string',
            'manager_name' => 'required|string',
            'operational_start_date' => 'required|date',
            'payroll_from_day' => 'required|integer|min:1|max:31',
            'payroll_to_day' => 'required|integer|min:1|max:31',
            'salary_generation_day' => 'required|integer|min:1|max:31',
            'docs' => 'required|array|min:1',
            'docs.*.file' => 'required|file',
            'docs.*.name' => 'required|string',
            'docs.*.document_number' => 'nullable|string',
            'docs.*.expiry_date' => 'required|date',
            'docs.*.reminder_days' => 'nullable|integer|min:0',
        ]);

        $branch = Branch::create([
            'name' => $validated['name'],
            'location' => $validated['location'],
            'manager_name' => $validated['manager_name'],
            'operational_start_date' => $validated['operational_start_date'],
            'payroll_from_day' => $validated['payroll_from_day'],
            'payroll_to_day' => $validated['payroll_to_day'],
            'salary_generation_day' => $validated['salary_generation_day'],
            'status' => 'Active'
        ]);

        foreach ($validated['docs'] as $doc) {
            $path = $doc['file']->store('branch_documents', 'public');
            BranchDocument::create([
                'branch_id' => $branch->id,
                'name' => $doc['name'],
                'document_number' => $doc['document_number'] ?? null,
                'path' => $path,
                'expiry_date' => $doc['expiry_date'],
                'reminder_days' => $doc['reminder_days'] ?? 30
            ]);
        }

        return response()->json(['message' => 'Branch created successfully', 'branch' => $branch]);
    }

    public function update(Request $request, $id)
    {
        $branch = Branch::findOrFail($id);
        $validated = $request->validate([
            'name' => 'required|string',
            'location' => 'required|string',
            'manager_name' => 'required|string',
            'operational_start_date' => 'required|date',
            'payroll_from_day' => 'required|integer|min:1|max:31',
            'payroll_to_day' => 'required|integer|min:1|max:31',
            'salary_generation_day' => 'required|integer|min:1|max:31',
            'status' => 'required|string',
            'new_docs' => 'nullable|array',
            'new_docs.*.file' => 'required|file',
            'new_docs.*.name' => 'required|string',
            'new_docs.*.document_number' => 'nullable|string',
            'new_docs.*.expiry_date' => 'required|date',
            'new_docs.*.reminder_days' => 'nullable|integer|min:0',
        ]);

        $branch->update([
            'name' => $validated['name'],
            'location' => $validated['location'],
            'manager_name' => $validated['manager_name'],
            'operational_start_date' => $validated['operational_start_date'],
            'payroll_from_day' => $validated['payroll_from_day'],
            'payroll_to_day' => $validated['payroll_to_day'],
            'salary_generation_day' => $validated['salary_generation_day'],
            'status' => $validated['status'],
        ]);

        if ($validated['status'] === 'Inactive') {
            $staffAction = $request->input('staff_action');
            if ($staffAction === 'move') {
                $targetBranchId = $request->input('move_to_branch_id');
                if ($targetBranchId) {
                    \App\Models\Staff::where('branch_id', $id)
                        ->where('status', 'Active')
                        ->update(['branch_id' => $targetBranchId]);
                }
            } elseif ($staffAction === 'inactivate') {
                \App\Models\Staff::where('branch_id', $id)
                    ->where('status', 'Active')
                    ->update(['status' => 'Inactive']);
            }
        }

        return response()->json(['message' => 'Branch updated successfully', 'branch' => $branch->load('documents')]);
    }

    public function show($id)
    {
        return response()->json(Branch::with('documents')->findOrFail($id));
    }

    public function destroy($id)
    {
        $branch = Branch::findOrFail($id);
        
        // Check for dependencies
        $dependencies = [
            'Staff' => \App\Models\Staff::where('branch_id', $id)->exists(),
            'Products' => \App\Models\Product::where('branch_id', $id)->exists(),
            'Expenses' => \App\Models\Expense::where('branch_id', $id)->exists(),
            'Collections' => \App\Models\Collection::where('branch_id', $id)->exists(),
            'Accounts' => \App\Models\Account::where('branch_id', $id)->exists(),
            'Sales' => \App\Models\ProductSale::where('branch_id', $id)->exists(),
            'Receptionists' => \App\Models\Receptionist::where('branch_id', $id)->exists(),
        ];

        $usedIn = array_keys(array_filter($dependencies));

        if (!empty($usedIn)) {
            return response()->json([
                'message' => 'Branch cannot be deleted because it is being used in: ' . implode(', ', $usedIn)
            ], 422);
        }

        $branch->delete();

        return response()->json(['message' => 'Branch deleted successfully']);
    }

    public function activeStaff($id)
    {
        $staff = \App\Models\Staff::where('branch_id', $id)
            ->where('status', 'Active')
            ->get(['id', 'full_name', 'role']);
        return response()->json($staff);
    }
}