<?php

namespace App\Console\Commands;

use Illuminate\Console\Command;
use Modules\EcommerceFinance\Services\BusinessDataPlacement;
use Modules\EcommerceFinance\Services\BusinessMirrorDatasetRegistry;
use Throwable;

class BusinessDataPlan extends Command
{
    protected $signature = 'business-data:plan {--json : 输出机器可读 JSON}';
    protected $description = '只读核对业务镜像数据集的页面用途、当前体量和目标存储层';

    public function handle(BusinessMirrorDatasetRegistry $datasets, BusinessDataPlacement $placements): int
    {
        try {
            $registered = $datasets->all();
            $policies = $placements->policies();
            $codeOwned = array_keys((array) config('upstream_mirrors.datasets', []));
            $missing = array_values(array_diff($codeOwned, array_keys($policies)));
            $unknown = array_values(array_diff(array_keys($policies), $codeOwned));
            $sizes = $this->tableSizes($placements);
            $rows = [];

            foreach ($registered as $key => $dataset) {
                $policy = in_array($key, $missing, true)
                    ? ['role' => 'unclassified', 'consumer' => '', 'target_store' => 'unclassified', 'sync' => 'unknown']
                    : $placements->policy($key);
                $size = $sizes[$dataset->targetTable()] ?? ['rows' => null, 'bytes' => null];
                $state = $placements->state($key);
                $rows[] = [
                    'dataset' => $key,
                    'table' => $dataset->targetTable(),
                    'role' => $policy['role'] ?? 'unclassified',
                    'consumer' => $policy['consumer'] ?? '',
                    'target_store' => $policy['target_store'] ?? 'unclassified',
                    'sync' => $policy['sync'] ?? 'always',
                    'estimated_rows' => $size['rows'],
                    'size_mib' => $size['bytes'] === null ? null : round($size['bytes'] / 1024 / 1024, 1),
                    'migration_phase' => $state['phase'] ?? 'not_started',
                ];
            }

            $payload = ['datasets' => $rows, 'missing_policies' => $missing, 'unknown_policies' => $unknown];
            if ($this->option('json')) {
                $this->line(json_encode($payload, JSON_UNESCAPED_UNICODE | JSON_THROW_ON_ERROR));
            } else {
                $this->table(
                    ['数据集', '当前表', '角色', '页面/用途', '目标层', '同步', '估算行数', 'MiB', '迁移阶段'],
                    array_map(static fn (array $row): array => array_values($row), $rows),
                );
                if ($missing !== []) {
                    $this->error('缺少存储策略：' . implode(', ', $missing));
                }
                if ($unknown !== []) {
                    $this->error('存在无对应数据集的存储策略：' . implode(', ', $unknown));
                }
            }

            return $missing === [] && $unknown === [] ? self::SUCCESS : self::FAILURE;
        } catch (Throwable $exception) {
            report($exception);
            $this->error('无法读取业务数据分层计划，请确认共享系统库和业务镜像库连接可用。');

            return self::FAILURE;
        }
    }

    /** @return array<string,array{rows:?int,bytes:?int}> */
    private function tableSizes(BusinessDataPlacement $placements): array
    {
        $connection = $placements->connection();
        if ($connection->getDriverName() !== 'mysql') {
            return [];
        }

        $database = $connection->getDatabaseName();
        return $connection->table('information_schema.TABLES')
            ->where('TABLE_SCHEMA', $database)
            ->get(['TABLE_NAME', 'TABLE_ROWS', 'DATA_LENGTH', 'INDEX_LENGTH'])
            ->mapWithKeys(static fn (object $row): array => [
                (string) $row->TABLE_NAME => [
                    'rows' => $row->TABLE_ROWS === null ? null : (int) $row->TABLE_ROWS,
                    'bytes' => (int) $row->DATA_LENGTH + (int) $row->INDEX_LENGTH,
                ],
            ])->all();
    }
}