<?php

namespace App\Services\Events;

use App\Models\QrCode;
use Illuminate\Support\Collection;

class EventSpeakerService
{
    public function __construct(private readonly EventProgrammeService $programmes) {}

    public function linkedProgramme(QrCode $event): ?QrCode
    {
        if ($event->type !== QrCode::TYPE_EVENT) {
            return null;
        }

        $programmeId = (int) ($event->content()['programme_qr_id'] ?? 0);
        if ($programmeId <= 0) {
            return null;
        }

        return QrCode::query()
            ->where('id', $programmeId)
            ->where('user_id', $event->user_id)
            ->where('type', QrCode::TYPE_ITINERARY)
            ->first();
    }

    /** @return list<array{name: string, email: string, role: string, bio: string, source: string}> */
    public function rosterFor(QrCode $event): array
    {
        if ($event->type !== QrCode::TYPE_EVENT) {
            return [];
        }

        $content = $event->content();
        $roster = [];

        foreach ((array) ($content['speakers'] ?? []) as $speaker) {
            if (! is_array($speaker)) {
                continue;
            }

            $name = trim((string) ($speaker['name'] ?? ''));
            if ($name === '') {
                continue;
            }

            $roster[] = [
                'name' => $name,
                'email' => trim((string) ($speaker['email'] ?? '')),
                'role' => trim((string) ($speaker['role'] ?? '')),
                'bio' => trim((string) ($speaker['bio'] ?? '')),
                'source' => 'roster',
            ];
        }

        foreach ($this->programmeAssignments($event) as $assignment) {
            $name = trim((string) ($assignment['name'] ?? ''));
            if ($name === '') {
                continue;
            }

            $exists = collect($roster)->contains(fn ($row) => strcasecmp($row['name'], $name) === 0);
            if ($exists) {
                continue;
            }

            $roster[] = [
                'name' => $name,
                'email' => '',
                'role' => trim((string) ($assignment['session'] ?? '')),
                'bio' => '',
                'source' => 'programme',
            ];
        }

        return $roster;
    }

    /** @return list<array{name: string, session: string, day: string, time: string}> */
    public function programmeAssignments(QrCode $event): array
    {
        $programme = $this->linkedProgramme($event);
        $snapshot = $this->programmes->snapshot($programme);
        if (! $snapshot) {
            return [];
        }

        $assignments = [];

        foreach ((array) ($snapshot['days'] ?? []) as $day) {
            $dayLabel = trim((string) ($day['date'] ?? $day['label'] ?? ''));
            foreach ((array) ($day['items'] ?? []) as $item) {
                if (! is_array($item)) {
                    continue;
                }

                $host = trim((string) ($item['host'] ?? ''));
                if ($host === '') {
                    continue;
                }

                $assignments[] = [
                    'name' => $host,
                    'session' => trim((string) ($item['title'] ?? '')),
                    'day' => $dayLabel,
                    'time' => trim((string) ($item['time'] ?? '')),
                ];
            }
        }

        return $assignments;
    }

    /** @return Collection<int, QrCode> */
    public function eventsForAccount(int $userId, ?string $search = null): Collection
    {
        return QrCode::query()
            ->where('user_id', $userId)
            ->where('type', QrCode::TYPE_EVENT)
            ->when($search !== null && $search !== '', fn ($q) => $q->where('label', 'like', "%{$search}%"))
            ->latest()
            ->get();
    }
}