<?php

namespace App\Http\Controllers;

use App\Models\Feed;
use App\Models\FeedPlatformChannel;
use App\Models\PlatformChannel;
use App\Services\RoutingValidationService;
use App\Exceptions\RoutingMismatchException;
use Illuminate\Database\Eloquent\Collection;
use Illuminate\Http\Request;
use Illuminate\Contracts\View\View;
use Illuminate\Http\RedirectResponse;

class RoutingController extends Controller
{
    public function index(): View
    {
        $feeds = Feed::with(['channels.platformInstance'])
            ->where('is_active', true)
            ->orderBy('name')
            ->get();

        $channels = PlatformChannel::with(['platformInstance', 'feeds'])
            ->where('is_active', true)
            ->orderBy('name')
            ->get();

        return view('pages.routing.index', compact('feeds', 'channels'));
    }

    public function create(): View
    {
        $feeds = Feed::where('is_active', true)
            ->orderBy('name')
            ->get();

        $channels = PlatformChannel::with('platformInstance')
            ->where('is_active', true)
            ->orderBy('name')
            ->get();

        return view('pages.routing.create', compact('feeds', 'channels'));
    }

    public function store(Request $request): RedirectResponse
    {
        $validated = $request->validate([
            'feed_id' => 'required|exists:feeds,id',
            'channel_ids' => 'required|array|min:1',
            'channel_ids.*' => 'exists:platform_channels,id',
            'priority' => 'integer|min:0|max:100',
            'filters' => 'nullable|string'
        ]);

        /** @var Feed $feed */
        $feed = Feed::findOrFail($validated['feed_id']);
        
        /** @var Collection<int, PlatformChannel> $channels */
        $channels = PlatformChannel::findMany($validated['channel_ids']);
        $priority = $validated['priority'] ?? 0;

        try {
            app(RoutingValidationService::class)->validateLanguageCompatibility($feed, $channels);
        } catch (RoutingMismatchException $e) {
            return redirect()->back()
                ->withInput()
                ->withErrors(['language' => $e->getMessage()]);
        }

        $filters = $this->parseJsonFilters($validated['filters'] ?? null);

        // Attach channels to feed
        $syncData = [];
        foreach ($validated['channel_ids'] as $channelId) {
            $syncData[$channelId] = [
                'is_active' => true,
                'priority' => $priority,
                'filters' => $filters,
                'created_at' => now(),
                'updated_at' => now()
            ];
        }

        $feed->channels()->syncWithoutDetaching($syncData);

        return redirect()->route('routing.index')
            ->with('success', 'Feed routing created successfully!');
    }

    public function edit(Feed $feed, PlatformChannel $channel): View
    {
        $routing = $feed->channels()
            ->wherePivot('platform_channel_id', $channel->id)
            ->first();

        if (! $routing) {
            abort(404, 'Routing not found');
        }

        return view('pages.routing.edit', compact('feed', 'channel', 'routing'));
    }

    public function update(Request $request, Feed $feed, PlatformChannel $channel): RedirectResponse
    {
        $validated = $request->validate([
            'is_active' => 'boolean',
            'priority' => 'integer|min:0|max:100',
            'filters' => 'nullable|string'
        ]);

        $filters = $this->parseJsonFilters($validated['filters'] ?? null);

        $feed->channels()->updateExistingPivot($channel->id, [
            'is_active' => $validated['is_active'] ?? true,
            'priority' => $validated['priority'] ?? 0,
            'filters' => $filters,
            'updated_at' => now()
        ]);

        return redirect()->route('routing.index')
            ->with('success', 'Routing updated successfully!');
    }

    public function destroy(Feed $feed, PlatformChannel $channel): RedirectResponse
    {
        $feed->channels()->detach($channel->id);

        return redirect()->route('routing.index')
            ->with('success', 'Routing deleted successfully!');
    }

    public function toggle(Request $request, Feed $feed, PlatformChannel $channel): RedirectResponse
    {
        $routing = FeedPlatformChannel::where('feed_id', $feed->id)
            ->where('platform_channel_id', $channel->id)
            ->first();

        if (! $routing) {
            abort(404, 'Routing not found');
        }

        $newStatus = ! $routing->is_active;

        $feed->channels()->updateExistingPivot($channel->id, [
            'is_active' => $newStatus,
            'updated_at' => now()
        ]);

        $status = $newStatus ? 'activated' : 'deactivated';

        return redirect()->route('routing.index')
            ->with('success', "Routing {$status} successfully!");
    }

    /**
     * @return array<string, mixed>|null
     */
    private function parseJsonFilters(?string $json): ?array
    {
        if (empty($json)) {
            return null;
        }

        $decoded = json_decode($json, true);

        if (json_last_error() === JSON_ERROR_NONE) {
            return $decoded;
        }

        return null;
    }
}