<?php

namespace App\Http\Controllers;

use App\Models\Contract;
use App\Models\ContractMeta;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Gate;

class ContractController extends Controller
{
    /**
     * Display a listing of the resource.
     */
    public function index()
    {
        $contracts = Contract::with('municipality')->latest()->paginate(10);
        return view('contracts.index', compact('contracts'));
    }

    /**
     * Show the form for creating a new resource.
     */
    public function create()
    {
        if (!auth()->user()->isManager()) {
            abort(403);
        }
        $municipalities = \App\Models\Municipality::active()->orderBy('name')->get();
        $licenseLevels = \App\Models\LicenseLevel::active()->orderBy('name')->get();
        return view('contracts.create', compact('municipalities', 'licenseLevels'));
    }

    /**
     * Store a newly created resource in storage.
     */
    public function store(Request $request)
    {
        if (!auth()->user()->isManager()) {
            abort(403);
        }

        $validated = $request->validate([
            'name' => 'required|string|max:255',
            'reference' => 'nullable|string|unique:contracts',
            'provider' => 'required|string',
            'municipality_id' => 'nullable|exists:municipalities,id',
            'start_date' => 'required|date',
            'end_date' => 'nullable|date|after_or_equal:start_date',
            'amount' => 'nullable|numeric',
            'type' => 'required|string',
            'meta' => 'nullable|array', // key-value pairs
        ]);

        $contract = Contract::create($validated);

        if ($request->has('meta')) {
            foreach ($request->meta as $key => $value) {
                if ($value) {
                    $contract->meta()->create(['key' => $key, 'value' => $value]);
                }
            }
        }

        return redirect()->route('contracts.index')
                         ->with('success', 'Contract created successfully.');
    }

    /**
     * Display the specified resource.
     */
    public function show(Contract $contract)
    {
        $contract->load(['meta', 'documents', 'municipality']);
        return view('contracts.show', compact('contract'));
    }

    /**
     * Show the form for editing the specified resource.
     */
    public function edit(Contract $contract)
    {
        if (!auth()->user()->isManager()) {
            abort(403);
        }
        $contract->load('meta');
        $municipalities = \App\Models\Municipality::active()->orderBy('name')->get();
        $licenseLevels = \App\Models\LicenseLevel::active()->orderBy('name')->get();
        return view('contracts.edit', compact('contract', 'municipalities', 'licenseLevels'));
    }

    /**
     * Update the specified resource in storage.
     */
    public function update(Request $request, Contract $contract)
    {
        if (!auth()->user()->isManager()) {
            abort(403);
        }

        $validated = $request->validate([
            'name' => 'required|string|max:255',
            'reference' => 'nullable|string|unique:contracts,reference,' . $contract->id,
            'provider' => 'required|string',
            'municipality_id' => 'nullable|exists:municipalities,id',
            'start_date' => 'required|date',
            'end_date' => 'nullable|date|after_or_equal:start_date',
            'amount' => 'nullable|numeric',
            'status' => 'required|string',
        ]);

        $contract->update($validated);
        
        // Handle Meta Data Update
        if ($request->has('meta')) {
            foreach ($request->meta as $key => $value) {
                if ($value) {
                    $contract->meta()->updateOrCreate(
                        ['key' => $key],
                        ['value' => $value]
                    );
                } else {
                    // If value is empty, maybe delete? Or just leave null.
                    // Let's delete if empty to keep clean
                    $contract->meta()->where('key', $key)->delete();
                }
            }
        }
        
        return redirect()->route('contracts.index')
                         ->with('success', 'Contract updated successfully.');
    }

    /**
     * Remove the specified resource from storage.
     */
    public function destroy(Contract $contract)
    {
        if (!auth()->user()->isAdmin()) { // Only admin can delete? Or manager?
            abort(403);
        }
        
        $contract->delete();

        return redirect()->route('contracts.index')
                         ->with('success', 'Contract deleted.');
    }
}