<?php

namespace App\Http\Controllers;

use App\Models\CalendarInstance;
use App\Models\CalendarMeta;
use App\Models\Subscription;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Str;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Redirect;

class CalendarSettingsController extends Controller
{
    /* landing page shows the first settings pane (language/region) */
    public function index()
    {
        return redirect()->route('calendar.settings.language');
    }

    /**
     * Language and region
     **/

    /* language and region form */
    public function languageForm(Request $request)
    {
        $user = $request->user();
        $settings = (array) ($user->settings ?? []);

        return $this->frame('calendar.settings.language', [
            'title' => __('calendar.settings.language_region.title'),

            'values' => [
                'language'    => $user->getSetting('app.language', app()->getLocale()),
                'region'      => $user->getSetting('app.region', 'US'),
                'date_format' => $user->getSetting('app.date_format', 'mdy'),
                'time_format' => $user->getSetting('app.time_format', '12'),
            ],

            'options' => [
                'languages' => [
                    'en' => 'English',
                    'es' => 'Spanish',
                    'fr' => 'French',
                    'de' => 'German',
                    'it' => 'Italian',
                    'pt' => 'Portuguese',
                    'nl' => 'Dutch',
                ],
                'regions' => [
                    'US' => 'United States',
                    'CA' => 'Canada',
                    'GB' => 'United Kingdom',
                    'AU' => 'Australia',
                    'NZ' => 'New Zealand',
                    'IE' => 'Ireland',
                    'DE' => 'Germany',
                    'FR' => 'France',
                    'ES' => 'Spain',
                    'IT' => 'Italy',
                    'NL' => 'Netherlands',
                ],
                'date_formats' => [
                    'mdy' => 'MM/DD/YYYY (01/15/2026)',
                    'dmy' => 'DD/MM/YYYY (15/01/2026)',
                    'ymd' => 'YYYY-MM-DD (2026-01-15)',
                ],
                'time_formats' => [
                    '12' => '12-hour (1:30 PM)',
                    '24' => '24-hour (13:30)',
                ],
            ],
        ]);
    }

    /* handle POST from language/region pane */
    public function languageStore(Request $request)
    {
        $data = $request->validate([
            'language'    => ['required', 'string', 'max:10', 'regex:/^[a-z]{2}([-_][A-Z]{2})?$/'],
            'region'      => ['required', 'string', 'size:2', 'regex:/^[A-Z]{2}$/'],
            'date_format' => ['required', 'in:mdy,dmy,ymd'],
            'time_format' => ['required', 'in:12,24'],
        ]);

        $user = $request->user();

        $user->setSettings([
            'app.language' => $data['language'],
            'app.region' => $data['region'],
            'app.date_format' => $data['date_format'],
            'app.time_format' => $data['time_format'],
        ]);

        // apply immediately for the current request cycle going forward
        app()->setLocale($data['language']);

        return redirect()
            ->route('calendar.settings.language')
            ->with('toast', __('Settings saved!'));
    }


    /**
     * Subscribe
     **/

    /* show “Subscribe to a calendar” form */
    public function subscribeForm()
    {
        return $this->frame(
            'calendar.settings.subscribe',
            [
                'title' => __('calendar.settings.subscribe.title'),
                'sub'   => __('calendar.settings.subscribe.subtitle'),
            ]);
    }

    /* handle POST from the subscribe form */
    public function subscribeStore(Request $request)
    {
        $data = $request->validate([
            'source' => ['required', 'url'],
            'displayname' => ['nullable', 'string', 'max:100'],
            'color' => ['nullable', 'regex:/^#[0-9A-F]{6}$/i'],
        ]);

        // create the calendarsubscription and calendar_meta rows in one call via Subscription model
        Subscription::createWithMeta(
            $request->user(),
            [
                'source'        => $data['source'],
                'displayname'   => $data['displayname'] ?: $data['source'],
                'calendarcolor' => $data['color'] ?? '#1a1a1a',
                // you can add 'refreshrate' => 'P1D' here if you like
            ]
        );

        return redirect()
            ->route('calendar.index')
            ->with('toast', __('Subscription added successfully!'));
    }


    /**
     * individual calendar settings
     */
    public function calendarForm(Request $request, string $calendarUri)
    {
        $user = $request->user();
        $principalUri = $user->uri;

        // this is the user's "instance" of the calendar (displayname/color/etc live here in sabre)
        $instance = CalendarInstance::query()
            ->where('principaluri', $principalUri)
            ->where('uri', $calendarUri)
            ->firstOrFail();

        // your app meta (optional row)
        $meta = $instance->meta;

        // if it's remote
        $icsUrl = null;
        if (($meta?->is_remote ?? false) && $meta?->subscription_id) {
            $icsUrl = Subscription::query()
                ->whereKey($meta->subscription_id)
                ->value('source');
        }

        return $this->frame(
            'calendar.settings.calendar',
            [
                'title'    => __('calendar.settings.calendar.title'),
                'sub'      => __('calendar.settings.calendar.subtitle'),
                'instance' => $instance,
                'meta'     => $meta,
                'icsUrl'   => $icsUrl,
                'userTz'   => $user->timezone,
            ]);
    }

    public function calendarStore(Request $request, string $calendarUri): RedirectResponse
    {
        $user = $request->user();
        $principalUri = $user->uri;

        $instance = CalendarInstance::query()
            ->where('principaluri', $principalUri)
            ->where('uri', $calendarUri)
            ->with('meta')
            ->firstOrFail();

        $data = $request->validate([
            'displayname'   => ['required', 'string', 'max:100'],
            'description'   => ['nullable', 'string', 'max:500'],
            'timezone'      => ['nullable', 'string', 'max:64'],
            'color'         => ['nullable', 'regex:/^#[0-9A-F]{6}$/i'],
        ]);

        $timezone = filled($data['timezone'] ?? null)
            ? $data['timezone']
            : $user->timezone;

        $color = $data['color'] ?? $instance->resolvedColor();

        DB::transaction(function () use ($instance, $data, $timezone, $color) {

            // update sabre calendar instance (dav-facing)
            $instance->update([
                'displayname'   => $data['displayname'],
                'description'   => $data['description'] ?? null,
                'timezone'      => $timezone,
                'calendarcolor' => $color,
            ]);

            // update ui meta (kithkin-facing)
            CalendarMeta::updateOrCreate(
                ['calendar_id' => $instance->calendarid],
                [
                    'title'    => $data['displayname'],
                    'color'    => $color,
                    'color_fg' => contrast_text_color($color),
                ]
            );
        });

        return Redirect::route('calendar.settings.calendars.show', $calendarUri)
            ->with('toast', [
                'message' => __('calendar.settings.saved'),
                'type'    => 'success',
            ]);
    }


    /**
     * content frame handler
     */
    private function frame(?string $view = null, array $data = [])
    {
        $user = request()->user();

        /* pull user's calendar instances and adapt ordering keys to calendarorder */
        $calendars = CalendarInstance::query()
            ->forUser($user)
            ->withUiMeta()
            ->ordered()
            ->get();

        return view('calendar.settings.index', [
            'view'      => $view,
            'data'      => $data,
            'calendars' => $calendars,
            'timezones' => config('timezones'),
        ]);
    }
}