<?php

namespace App\Commands;

use App\Dto\PackagistApiPackagePayload;
use Illuminate\Support\Facades\Http;
use LaravelZero\Framework\Commands\Command;

class CheckCommand extends Command {
    protected $signature = 'check
        {vendor : Package vendor (required)}
        {package : Package name (required)}
        {months=9 : How many months should we return for review (optional)}
        ';
    protected $description = 'Check package branch usage';

    private string $vendor = '';
    private string $package = '';
    private string $filter = '';
    private int $total_branches = 0;

    public function handle() : int {
        $this->vendor  = (string) $this->argument( 'vendor' );
        $this->package = (string) $this->argument( 'package' );
        $months        = (int) $this->argument( 'months' );

        $this->info( 'Checking: ' . sprintf( '%s/%s', $this->vendor, $this->package ) );
        $this->info( 'Months: ' . $months );

        $payload = Http::get( sprintf(
            'https://packagist.org/packages/%s/%s.json',
            $this->vendor,
            $this->package
        ) );

        $this->filter = now()->subMonths( $months )->day( 1 )->toDateString();

        try {
            $pkg = new PackagistApiPackagePayload( $payload->json() );
            $this->info( 'Found the package. Type: ' . $pkg->type );

            $versions = collect( $pkg->versions ?? [] )
                ->keys()
                // Filter actual versions out.
                ->filter( fn( $version ) => \str_starts_with( $version, 'dev-' ) )
                ->sort();

            $this->total_branches = $versions->count();

            $this->info( sprintf(
                'Package has %d branches. Starting to download statistics.',
                $this->total_branches
            ) );

            $statistics = collect( $versions )
                ->mapWithKeys( fn( $branch ) => $this->get_statistics( $branch ) )
                ->toArray();

            $this->info( 'Downloaded statistics...' );

            $this->output_table( $statistics );
            $this->output_suggestions( $statistics );
        }
        catch ( \Exception $e ) {
            $this->error( $e->getMessage(), $e );
        }

        return 0;
    }

    private function get_statistics( $branch ) : array {
        $payload = Http::get( sprintf(
            'https://packagist.org/packages/%s/%s/stats/%s.json?average=monthly&from=%s',
            $this->vendor,
            $this->package,
            $branch,
            $this->filter
        ) );

        $data   = collect( $payload->json() );
        $labels = collect( $data->get( 'labels', [] ) )->toArray();
        $values = collect( $data->get( 'values', [] ) )->flatten()->toArray();

        $labels[] = 'Total';
        $values[] = array_sum( $values );

        return [ $branch => \array_combine( $labels, $values ) ];
    }

    private function output_table( array $statistics ) : void {
        if ( empty( $statistics ) ) {
            $this->info( 'No statistics found... Stopping.' );
            exit( 0 );
        }

        $tableHeaders  = [ '' => 'Branch' ];
        $tableBranches = [];

        foreach ( $statistics as $branch => $stats ) {
            foreach ( $stats as $m => $v ) {
                $tableHeaders[ $m ]                  = (string) $m;
                $tableBranches[ $branch ][ $branch ] = $branch;
                $tableBranches[ $branch ][ $m ]      = (string) $v;
            }
        }

        $this->line('');
        $this->table( $tableHeaders, $tableBranches );
    }

    private function output_suggestions( array $statistics = [] ) : void {
        $deletable = [];
        if ( empty( $statistics ) ) {
            $this->info( 'No statistics to give suggestions for. Quitting...' );
            exit( 0 );
        }

        foreach ( $statistics as $k => $values ) {
            if ( ! empty( $values['Total'] ) ) {
                continue;
            }
            $deletable[ $k ] = $values['Total'];
        }

        if ( empty( $deletable ) ) {
            $this->info( 'No suggestions available. Good job!' );
            exit( 0 );
        }

        $keys = array_keys( $deletable );

        $branches = collect( $keys )->mapWithKeys( function ( $branch ) {
            return [
                $branch => [
                    $branch,
                    sprintf(
                        'https://packagist.org/packages/%s/%s#%s',
                        $this->vendor,
                        $this->package,
                        $branch
                    ),
                ],
            ];
        } );

        $this->line('');
        $this->info( sprintf(
            'Found %d branches (out of %d total) with no downloads since %s',
            $branches->count(),
            $this->total_branches,
            $this->filter
        ) );
        $this->table( [ 'Branch', 'URL' ], $branches );
    }
}