<?php

namespace App\Http\Controllers;

use App\Models\Expense;
use App\Models\Employee;
use App\Models\EmployeeFinancial;
use App\Models\Project;
use App\Models\Item;
use App\Models\InventoryTransaction;
use App\Models\WorkLog;
use Illuminate\Http\Request;

class ReportController extends Controller
{
    /**
     * Display reports index.
     */
    public function index()
    {
        return view('reports.index');
    }

    /**
     * Display financial report.
     */
    public function financial(Request $request)
    {
        $query = Expense::with(['project', 'currency']);

        if ($request->filled('project_id')) {
            $query->where('project_id', $request->project_id);
        }

        if ($request->filled('from_date')) {
            $query->where('expense_date', '>=', $request->from_date);
        }

        if ($request->filled('to_date')) {
            $query->where('expense_date', '<=', $request->to_date);
        }

        $expenses = $query->orderBy('expense_date', 'desc')->get();

        $totalAmount = $expenses->sum('amount');
        $approvedAmount = $expenses->where('status', 'approved')->sum('amount');
        $pendingAmount = $expenses->where('status', 'pending')->sum('amount');

        $byProject = $expenses->groupBy('project_id')->map(function ($group) {
            return [
                'project' => $group->first()?->project?->name ?? '-',
                'total' => $group->sum('amount'),
                'count' => $group->count(),
            ];
        });

        $byCategory = $expenses->groupBy('category')->map(function ($group) {
            return [
                'category' => $group->first()->category ?? '-',
                'total' => $group->sum('amount'),
                'count' => $group->count(),
            ];
        });

        $projects = Project::all();

        return view('reports.financial', compact('expenses', 'totalAmount', 'approvedAmount', 'pendingAmount', 'byProject', 'byCategory', 'projects'));
    }

    /**
     * Export financial report to Excel.
     */
    public function financialExportExcel(Request $request)
    {
        // Stub - will implement with Excel export library
        return back()->with('info', __('reports.export_coming_soon'));
    }

    /**
     * Export financial report to PDF.
     */
    public function financialExportPdf(Request $request)
    {
        // Stub - will implement with PDF library
        return back()->with('info', __('reports.export_coming_soon'));
    }

    /**
     * Display employee work-log report.
     */
    public function employeeWorklog(Request $request)
    {
        $query = WorkLog::with(['employee', 'project', 'task']);

        if ($request->filled('employee_id')) {
            $query->where('employee_id', $request->employee_id);
        }

        if ($request->filled('project_id')) {
            $query->where('project_id', $request->project_id);
        }

        if ($request->filled('from_date')) {
            $query->where('date', '>=', $request->from_date);
        }

        if ($request->filled('to_date')) {
            $query->where('date', '<=', $request->to_date);
        }

        $workLogs = $query->orderBy('date', 'desc')->paginate(30)->appends($request->query());
        $employees = Employee::where('status', 'active')->get();
        $projects = Project::all();

        return view('reports.employee-worklog', compact('workLogs', 'employees', 'projects'));
    }

    /**
     * Export employee work-log report to Excel.
     */
    public function employeeWorklogExportExcel(Request $request)
    {
        return back()->with('info', __('reports.export_coming_soon'));
    }

    /**
     * Display inventory report.
     */
    public function inventory(Request $request)
    {
        $query = InventoryTransaction::with(['item', 'warehouse', 'project']);

        if ($request->filled('warehouse_id')) {
            $query->where('warehouse_id', $request->warehouse_id);
        }

        if ($request->filled('type')) {
            $query->where('type', $request->type);
        }

        if ($request->filled('from_date')) {
            $query->where('created_at', '>=', $request->from_date);
        }

        if ($request->filled('to_date')) {
            $query->where('created_at', '<=', $request->to_date);
        }

        $transactions = $query->orderBy('created_at', 'desc')->paginate(30)->appends($request->query());

        $items = Item::orderBy('name')->get();
        $warehouses = \App\Models\Warehouse::orderBy('name')->get();

        return view('reports.inventory', compact('transactions', 'items', 'warehouses'));
    }

    /**
     * Export inventory report to Excel.
     */
    public function inventoryExportExcel(Request $request)
    {
        return back()->with('info', __('reports.export_coming_soon'));
    }

    /**
     * Display payroll report.
     */
    public function payroll(Request $request)
    {
        $query = EmployeeFinancial::with(['employee', 'currency']);

        if ($request->filled('month')) {
            $query->where('month', $request->month);
        }

        if ($request->filled('year')) {
            $query->where('year', $request->year);
        }

        if ($request->filled('type')) {
            $query->byType($request->type);
        }

        $financials = $query->orderBy('effective_date', 'desc')->paginate(30)->appends($request->query());

        $employees = Employee::where('status', 'active')->get();
        $months = range(1, 12);
        $currentYear = now()->year;
        $years = range($currentYear - 2, $currentYear + 1);

        return view('reports.payroll', compact('financials', 'employees', 'months', 'years'));
    }

    /**
     * Export payroll report to Excel.
     */
    public function payrollExportExcel(Request $request)
    {
        return back()->with('info', __('reports.export_coming_soon'));
    }
}