<?php

namespace App\Dashboard\Stats;

use App\Models\ArticlePublication;
use App\Models\PlatformChannel;
use App\Support\DateRange;

class PublicationsPerChannel implements BreakdownStat
{
    public function key(): string
    {
        return 'publications-per-channel';
    }

    public function label(): string
    {
        return 'Publications per Channel';
    }

    public function for(DateRange $range): BreakdownResult
    {
        /** @var array<int, int> $counts */
        $counts = ArticlePublication::query()
            ->whereBetween('published_at', [$range->from, $range->to])
            ->selectRaw('platform_channel_id, COUNT(*) as aggregate')
            ->groupBy('platform_channel_id')
            ->pluck('aggregate', 'platform_channel_id')
            ->all();

        // Zero-fill in PHP; assumes the channel table stays small enough to load whole.
        $rows = PlatformChannel::query()
            ->get()
            ->map(fn (PlatformChannel $channel): Breakdown => new Breakdown(
                $channel->display_name,
                (int) ($counts[$channel->id] ?? 0),
            ))
            ->all();

        usort(
            $rows,
            fn (Breakdown $a, Breakdown $b): int => [$b->count, $a->label] <=> [$a->count, $b->label],
        );

        return new BreakdownResult($rows);
    }
}