<?php

declare(strict_types=1);

namespace App\Http\Controllers;

use App\Enums\EventStatus;
use App\Models\BrandContract;
use App\Models\Client;
use App\Models\ClientCategory;
use App\Models\Event;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Arr;
use Illuminate\View\View;

class EventController extends Controller
{
    private function categoryTree(): \Illuminate\Support\Collection
    {
        return ClientCategory::with('children')
            ->whereNull('parent_id')
            ->orderBy('sort_order')
            ->get();
    }

    public function index(): View
    {
        $events       = Event::with('client')->orderBy('start_time')->get();
        $clients      = Client::where('status', 'active')->orderBy('name')->get();
        $categoryTree = $this->categoryTree();

        // Format for FullCalendar
        $calendarEvents = $events->map(fn (Event $e) => [
            'id'              => $e->id,
            'title'           => ($e->is_priority ? '⭐ ' : '') . $e->title,
            'start'           => $e->start_time->toIso8601String(),
            'end'             => $e->end_time?->toIso8601String(),
            'backgroundColor' => $e->color,
            'borderColor'     => $e->color,
            'extendedProps'   => [
                'status'   => $e->status->value,
                'client'   => $e->client?->name,
                'type'     => $e->event_type,
                'priority' => $e->is_priority,
            ],
        ]);

        return view('schedule.index', compact('events', 'clients', 'calendarEvents', 'categoryTree'));
    }

    public function store(Request $request): RedirectResponse
    {
        $validated = $request->validate([
            'title'                 => 'required|string|max:255',
            'description'           => 'nullable|string',
            'client_id'             => 'nullable|exists:clients,id',
            'category_id'           => 'nullable|exists:client_categories,id',
            'event_type'            => 'required|in:task,meeting,deadline,posting',
            'start_time'            => 'required|date',
            'end_time'              => 'nullable|date|after:start_time',
            'location'              => 'nullable|string|max:255',
            'is_priority'           => 'boolean',
            'is_all_day'            => 'boolean',
            'color'                 => 'nullable|string|max:20',
            'notes'                 => 'nullable|string',
            'create_brand_contract' => 'nullable|boolean',
            'contract_title'        => 'nullable|string|max:255',
            'contract_start_date'   => 'nullable|date',
            'contract_end_date'     => 'nullable|date|after_or_equal:contract_start_date',
        ]);

        $validated['is_priority'] = $request->boolean('is_priority');
        $validated['is_all_day']  = $request->boolean('is_all_day');

        $event = Event::create(Arr::except($validated, [
            'create_brand_contract', 'contract_title', 'contract_start_date', 'contract_end_date',
        ]));

        if ($request->boolean('create_brand_contract') && $event->client_id) {
            BrandContract::create([
                'title'       => $request->input('contract_title') ?: $event->title,
                'client_id'   => $event->client_id,
                'category_id' => $event->category_id,
                'start_date'  => $request->input('contract_start_date') ?? $event->start_time->toDateString(),
                'end_date'    => $request->input('contract_end_date') ?? ($event->end_time?->toDateString() ?? $event->start_time->toDateString()),
                'is_active'   => true,
            ]);
        }

        return redirect()->route('schedule.index')
            ->with('success', '🐾 Event scheduled!');
    }

    public function edit(Event $event): View
    {
        $clients      = Client::where('status', 'active')->orderBy('name')->get();
        $statuses     = EventStatus::cases();
        $categoryTree = $this->categoryTree();

        return view('schedule.edit', compact('event', 'clients', 'statuses', 'categoryTree'));
    }

    public function update(Request $request, Event $event): RedirectResponse
    {
        $validated = $request->validate([
            'title'                 => 'required|string|max:255',
            'description'           => 'nullable|string',
            'client_id'             => 'nullable|exists:clients,id',
            'category_id'           => 'nullable|exists:client_categories,id',
            'event_type'            => 'required|in:task,meeting,deadline,posting',
            'start_time'            => 'required|date',
            'end_time'              => 'nullable|date',
            'location'              => 'nullable|string|max:255',
            'is_priority'           => 'boolean',
            'status'                => 'required|in:pending,in_progress,completed,cancelled',
            'color'                 => 'nullable|string|max:20',
            'notes'                 => 'nullable|string',
            'create_brand_contract' => 'nullable|boolean',
            'contract_title'        => 'nullable|string|max:255',
            'contract_start_date'   => 'nullable|date',
            'contract_end_date'     => 'nullable|date|after_or_equal:contract_start_date',
        ]);

        $validated['is_priority'] = $request->boolean('is_priority');
        $event->update(Arr::except($validated, [
            'create_brand_contract', 'contract_title', 'contract_start_date', 'contract_end_date',
        ]));

        if ($request->boolean('create_brand_contract') && $event->client_id) {
            BrandContract::create([
                'title'       => $request->input('contract_title') ?: $event->title,
                'client_id'   => $event->client_id,
                'category_id' => $event->category_id,
                'start_date'  => $request->input('contract_start_date') ?? $event->start_time->toDateString(),
                'end_date'    => $request->input('contract_end_date') ?? ($event->end_time?->toDateString() ?? $event->start_time->toDateString()),
                'is_active'   => true,
            ]);
        }

        return redirect()->route('schedule.index')
            ->with('success', '🐾 Event updated!');
    }

    public function updateDates(Request $request, Event $event): JsonResponse
    {
        $validated = $request->validate([
            'start_time' => 'required|date',
            'end_time'   => 'nullable|date',
        ]);

        $event->update($validated);

        return response()->json(['ok' => true]);
    }

    public function destroy(Event $event): RedirectResponse
    {
        $event->delete();

        return redirect()->route('schedule.index')
            ->with('success', '🐾 Event removed.');
    }

    public function apiList(): JsonResponse
    {
        $events = Event::with('client')->get()->map(fn (Event $e) => [
            'id'              => $e->id,
            'title'           => ($e->is_priority ? '⭐ ' : '') . $e->title,
            'start'           => $e->start_time->toIso8601String(),
            'end'             => $e->end_time?->toIso8601String(),
            'backgroundColor' => $e->color,
            'borderColor'     => $e->color,
            'allDay'          => $e->is_all_day,
            'extendedProps'   => [
                'status'   => $e->status->value,
                'client'   => $e->client?->name,
                'type'     => $e->event_type,
                'priority' => $e->is_priority,
            ],
        ]);

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