<?php

namespace App\Console\Commands;

use App\Models\AnalyticsSession;
use App\Models\DailyAggregate;
use App\Models\PageDailyAggregate;
use App\Models\PageView;
use App\Models\Website;
use Illuminate\Console\Command;
use Illuminate\Support\Carbon;
use Illuminate\Support\Facades\DB;

class AggregateAnalytics extends Command
{
    protected $signature = 'analytics:aggregate
        {--date= : The date to aggregate (YYYY-MM-DD). Defaults to yesterday.}
        {--website= : Aggregate only a specific website ID.}';

    protected $description = 'Roll up raw analytics data into daily aggregate tables';

    public function handle(): int
    {
        $date = $this->option('date')
            ? Carbon::parse($this->option('date'))
            : Carbon::yesterday();

        if ($date->isToday()) {
            $this->error('Cannot aggregate today\'s data — it is still being collected.');

            return self::FAILURE;
        }

        $websites = $this->option('website')
            ? Website::where('id', $this->option('website'))->get()
            : Website::all();

        if ($websites->isEmpty()) {
            $this->warn('No websites found.');

            return self::SUCCESS;
        }

        $this->info("Aggregating data for {$date->toDateString()} across {$websites->count()} website(s)...");

        $bar = $this->output->createProgressBar($websites->count());
        $bar->start();

        foreach ($websites as $website) {
            $this->aggregateForWebsite($website, $date);
            $bar->advance();
        }

        $bar->finish();
        $this->newLine();
        $this->info('Aggregation complete.');

        return self::SUCCESS;
    }

    private function aggregateForWebsite(Website $website, Carbon $date): void
    {
        $dayStart = $date->copy()->startOfDay();
        $dayEnd = $date->copy()->endOfDay();

        DB::transaction(function () use ($website, $date, $dayStart, $dayEnd) {
            $this->aggregateDaily($website, $date, $dayStart, $dayEnd);
            $this->aggregatePageDaily($website, $date, $dayStart, $dayEnd);
        });
    }

    private function aggregateDaily(Website $website, Carbon $date, Carbon $dayStart, Carbon $dayEnd): void
    {
        $visitors = PageView::where('website_id', $website->id)
            ->whereBetween('viewed_at', [$dayStart, $dayEnd])
            ->distinct('visitor_id')
            ->count('visitor_id');

        $sessions = AnalyticsSession::where('website_id', $website->id)
            ->whereBetween('started_at', [$dayStart, $dayEnd])
            ->count();

        $page_views = PageView::where('website_id', $website->id)
            ->whereBetween('viewed_at', [$dayStart, $dayEnd])
            ->count();

        $bounce_count = AnalyticsSession::where('website_id', $website->id)
            ->whereBetween('started_at', [$dayStart, $dayEnd])
            ->where('is_bounce', true)
            ->count();

        $total_duration = (int) AnalyticsSession::where('website_id', $website->id)
            ->whereBetween('started_at', [$dayStart, $dayEnd])
            ->sum('duration');

        DailyAggregate::updateOrCreate(
            ['website_id' => $website->id, 'date' => $date->toDateString()],
            compact('visitors', 'sessions', 'page_views', 'bounce_count', 'total_duration'),
        );
    }

    private function aggregatePageDaily(Website $website, Carbon $date, Carbon $dayStart, Carbon $dayEnd): void
    {
        $pages = PageView::where('website_id', $website->id)
            ->whereBetween('viewed_at', [$dayStart, $dayEnd])
            ->select(
                'path',
                DB::raw('COUNT(*) as views'),
                DB::raw('COUNT(DISTINCT visitor_id) as unique_views'),
                DB::raw('COALESCE(SUM(time_on_page), 0) as total_time_on_page'),
            )
            ->groupBy('path')
            ->get();

        $bouncePaths = AnalyticsSession::where('website_id', $website->id)
            ->whereBetween('started_at', [$dayStart, $dayEnd])
            ->where('is_bounce', true)
            ->whereNotNull('entry_page')
            ->select('entry_page as path', DB::raw('COUNT(*) as bounces'))
            ->groupBy('entry_page')
            ->pluck('bounces', 'path');

        PageDailyAggregate::where('website_id', $website->id)
            ->where('date', $date->toDateString())
            ->delete();

        $rows = $pages->map(fn ($page) => [
            'website_id' => $website->id,
            'date' => $date->toDateString(),
            'path' => $page->path,
            'views' => $page->views,
            'unique_views' => $page->unique_views,
            'total_time_on_page' => $page->total_time_on_page,
            'bounces' => $bouncePaths->get($page->path, 0),
            'created_at' => now(),
            'updated_at' => now(),
        ])->toArray();

        foreach (array_chunk($rows, 500) as $chunk) {
            PageDailyAggregate::insert($chunk);
        }
    }
}