<?php

namespace App\Http\Controllers\Api;

use App\Http\Controllers\Controller;
use App\Models\Announcement;
use App\Models\AnnouncementView;
use Illuminate\Http\Request;

class WorkerAnnouncementController extends Controller
{
    /**
     * Get all announcements for workers.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return \Illuminate\Http\JsonResponse
     */
    public function getAnnouncements(Request $request)
    {
        try {
            $page = (int)$request->input('page', 1);
            $perPage = (int)$request->input('per_page', 15);

            $query = Announcement::with(['employer.employerProfile', 'sponsor'])->where('status', 'approved')->latest();
            $total = $query->count();
            $offset = ($page - 1) * $perPage;

            $announcements = $query->skip($offset)->take($perPage)->get()
                ->map(function ($announcement) {
                    $postedBy = 'System';
                    $organization = 'Migrant Support';

                    if ($announcement->sponsor_id) {
                        $postedBy = $announcement->sponsor->full_name;
                        $organization = $announcement->sponsor->organization_name;
                    } elseif ($announcement->employer_id) {
                        $postedBy = $announcement->employer->name;
                        $organization = $announcement->employer->employerProfile->company_name ?? 'Employer';
                    }

                    // Decode charity details if they exist in json
                    $charityDetails = null;
                    $content = $announcement->body;
                    if (strpos($announcement->body, '{"type":"Charity"') === 0) {
                        $decoded = json_decode($announcement->body, true);
                        if ($decoded) {
                            $charityDetails = $decoded;
                            $content = $decoded['content'] ?? $announcement->body;
                        }
                    }

                    return [
                        'id' => $announcement->id,
                        'title' => $announcement->title,
                        'body' => $content,
                        'type' => $announcement->type,
                        'employer_name' => $postedBy,
                        'company_name' => $organization,
                        'created_at' => $announcement->created_at->toISOString(),
                        'time_ago' => $announcement->created_at->diffForHumans(),
                        'charity_details' => $charityDetails,
                    ];
                });

            return response()->json([
                'success' => true,
                'data' => [
                    'announcements' => $announcements,
                    'pagination' => [
                        'total' => $total,
                        'per_page' => $perPage,
                        'current_page' => $page,
                        'last_page' => max(1, (int)ceil($total / $perPage)),
                    ]
                ]
            ], 200);

        } catch (\Exception $e) {
            logger()->error('Mobile Worker Get Announcements Failure: ' . $e->getMessage());

            return response()->json([
                'success' => false,
                'message' => 'An error occurred while fetching announcements.',
                'error' => app()->environment('local') ? $e->getMessage() : 'Internal Server Error'
            ], 500);
        }
    }

    /**
     * Get up to 3 unviewed announcements for the worker, and mark them as viewed.
     */
    public function getNewAnnouncements(Request $request)
    {
        /** @var \App\Models\Worker $worker */
        $worker = $request->attributes->get('worker');

        try {
            $viewedIds = AnnouncementView::where('worker_id', $worker->id)->pluck('announcement_id');

            $dbAnnouncements = Announcement::with(['employer.employerProfile', 'sponsor'])
                ->where('status', 'approved')
                ->whereNotIn('id', $viewedIds)
                ->latest('id')
                ->limit(3)
                ->get();

            // Mark them as viewed
            foreach ($dbAnnouncements as $announcement) {
                AnnouncementView::firstOrCreate([
                    'worker_id' => $worker->id,
                    'announcement_id' => $announcement->id,
                ]);
            }

            $announcements = $dbAnnouncements->map(function ($announcement) {
                $postedBy = 'System';
                $organization = 'Migrant Support';

                if ($announcement->sponsor_id) {
                    $postedBy = $announcement->sponsor->full_name;
                    $organization = $announcement->sponsor->organization_name;
                } elseif ($announcement->employer_id) {
                    $postedBy = $announcement->employer->name;
                    $organization = $announcement->employer->employerProfile->company_name ?? 'Employer';
                }

                // Decode charity details if they exist in json
                $charityDetails = null;
                $content = $announcement->body;
                if (strpos($announcement->body, '{"type":"Charity"') === 0) {
                    $decoded = json_decode($announcement->body, true);
                    if ($decoded) {
                        $charityDetails = $decoded;
                        $content = $decoded['content'] ?? $announcement->body;
                    }
                }

                return [
                    'id' => $announcement->id,
                    'title' => $announcement->title,
                    'body' => $content,
                    'type' => $announcement->type,
                    'employer_name' => $postedBy,
                    'company_name' => $organization,
                    'created_at' => $announcement->created_at->toISOString(),
                    'time_ago' => $announcement->created_at->diffForHumans(),
                    'charity_details' => $charityDetails,
                ];
            });

            return response()->json([
                'success' => true,
                'data' => [
                    'announcements' => $announcements,
                ]
            ], 200);

        } catch (\Exception $e) {
            logger()->error('Mobile Worker Get New Announcements Failure: ' . $e->getMessage());

            return response()->json([
                'success' => false,
                'message' => 'An error occurred while fetching new announcements.',
                'error' => app()->environment('local') ? $e->getMessage() : 'Internal Server Error'
            ], 500);
        }
    }

    /**
     * Explicitly mark an announcement as viewed by the worker.
     */
    public function markAnnouncementViewed(Request $request, $id)
    {
        /** @var \App\Models\Worker $worker */
        $worker = $request->attributes->get('worker');

        try {
            AnnouncementView::firstOrCreate([
                'worker_id' => $worker->id,
                'announcement_id' => $id,
            ]);

            return response()->json([
                'success' => true,
                'message' => 'Announcement marked as viewed.'
            ], 200);

        } catch (\Exception $e) {
            logger()->error('Mobile Worker Mark Announcement Viewed Failure: ' . $e->getMessage());

            return response()->json([
                'success' => false,
                'message' => 'An error occurred.',
                'error' => app()->environment('local') ? $e->getMessage() : 'Internal Server Error'
            ], 500);
        }
    }
}