<?php

declare(strict_types=1);

namespace App\Console\Commands;

use App\Jobs\BackfillWorkspaceIdsJob;
use App\Models\Workspace;
use App\Services\Audit\WorkspaceAuditLogger;
use App\Services\OperationRunService;
use App\Support\WorkspaceIsolation\TenantOwnedTables;
use Illuminate\Console\Command;
use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Facades\DB;

class TenantpilotBackfillWorkspaceIds extends Command
{
    protected $signature = 'tenantpilot:backfill-workspace-ids
        {--dry-run : Print per-table counts only}
        {--table= : Restrict to a single tenant-owned table}
        {--batch-size=5000 : Rows per queued chunk}
        {--resume-from=0 : Resume from id cursor}
        {--max-rows= : Maximum rows to process per table job}';

    protected $description = 'Backfill missing workspace_id across tenant-owned tables.';

    public function handle(OperationRunService $operationRunService, WorkspaceAuditLogger $workspaceAuditLogger): int
    {
        $tables = $this->resolveTables();

        if ($tables === []) {
            return self::FAILURE;
        }

        $batchSize = max(1, (int) $this->option('batch-size'));
        $resumeFrom = max(0, (int) $this->option('resume-from'));
        $maxRows = $this->normalizeMaxRows();
        $dryRun = (bool) $this->option('dry-run');

        $lock = Cache::lock('tenantpilot:backfill-workspace-ids', 900);

        if (! $lock->get()) {
            $this->error('Another workspace backfill is already running.');

            return self::FAILURE;
        }

        try {
            $tableStats = $this->collectTableStats($tables);

            $this->table(
                ['Table', 'Missing workspace_id', 'Unresolvable tenant mapping', 'Sample row ids'],
                array_map(static function (array $stats): array {
                    return [
                        $stats['table'],
                        $stats['missing'],
                        $stats['unresolvable'],
                        $stats['sample_ids'] === [] ? '-' : implode(',', $stats['sample_ids']),
                    ];
                }, $tableStats),
            );

            $unresolvable = array_values(array_filter($tableStats, static fn (array $stats): bool => $stats['unresolvable'] > 0));

            if ($unresolvable !== []) {
                foreach ($unresolvable as $stats) {
                    $this->error(sprintf(
                        'Unresolvable tenant->workspace mapping in %s (%d rows). Sample ids: %s',
                        $stats['table'],
                        $stats['unresolvable'],
                        $stats['sample_ids'] === [] ? '-' : implode(',', $stats['sample_ids']),
                    ));
                }

                return self::FAILURE;
            }

            if ($dryRun) {
                $this->info('Dry-run complete. No changes written.');

                return self::SUCCESS;
            }

            $workspaceWorkloads = $this->collectWorkspaceWorkloads($tables, $maxRows);

            if ($workspaceWorkloads === []) {
                $this->info('No rows require workspace_id backfill.');

                return self::SUCCESS;
            }

            $dispatchedJobs = 0;

            foreach ($workspaceWorkloads as $workspaceId => $workload) {
                $workspace = Workspace::query()->find($workspaceId);

                if (! $workspace instanceof Workspace) {
                    continue;
                }

                $run = $operationRunService->ensureWorkspaceRunWithIdentity(
                    workspace: $workspace,
                    type: 'workspace_isolation_backfill_workspace_ids',
                    identityInputs: [
                        'tables' => array_keys($workload['tables']),
                    ],
                    context: [
                        'source' => 'tenantpilot:backfill-workspace-ids',
                        'workspace_id' => (int) $workspace->getKey(),
                        'batch_size' => $batchSize,
                        'max_rows' => $maxRows,
                        'resume_from' => $resumeFrom,
                        'tables' => array_keys($workload['tables']),
                    ],
                );

                if (! $run->wasRecentlyCreated) {
                    $this->line(sprintf(
                        'Workspace %d already has an active backfill run (#%d).',
                        (int) $workspace->getKey(),
                        (int) $run->getKey(),
                    ));

                    continue;
                }

                $tableProgress = [];
                foreach ($workload['tables'] as $table => $count) {
                    $tableProgress[$table] = [
                        'target_rows' => (int) $count,
                        'processed' => 0,
                        'last_processed_id' => $resumeFrom,
                    ];
                }

                $context = is_array($run->context) ? $run->context : [];
                $context['table_progress'] = $tableProgress;

                $run->update([
                    'context' => $context,
                    'summary_counts' => [
                        'total' => (int) $workload['total'],
                        'processed' => 0,
                        'succeeded' => 0,
                        'failed' => 0,
                    ],
                ]);

                $operationRunService->updateRun($run, status: 'running');

                $workspaceAuditLogger->log(
                    workspace: $workspace,
                    action: 'workspace_isolation.backfill_workspace_ids.started',
                    context: [
                        'operation_run_id' => (int) $run->getKey(),
                        'tables' => array_keys($workload['tables']),
                        'planned_rows' => (int) $workload['total'],
                        'batch_size' => $batchSize,
                    ],
                    status: 'success',
                    resourceType: 'operation_run',
                    resourceId: (string) $run->getKey(),
                );

                $workspaceJobs = 0;

                foreach ($workload['tables'] as $table => $tableRows) {
                    if ($tableRows <= 0) {
                        continue;
                    }

                    BackfillWorkspaceIdsJob::dispatch(
                        operationRunId: (int) $run->getKey(),
                        workspaceId: (int) $workspace->getKey(),
                        table: $table,
                        batchSize: $batchSize,
                        maxRows: $maxRows,
                        resumeFrom: $resumeFrom,
                    );

                    $workspaceJobs++;
                    $dispatchedJobs++;
                }

                $workspaceAuditLogger->log(
                    workspace: $workspace,
                    action: 'workspace_isolation.backfill_workspace_ids.dispatched',
                    context: [
                        'operation_run_id' => (int) $run->getKey(),
                        'jobs_dispatched' => $workspaceJobs,
                        'tables' => array_keys($workload['tables']),
                    ],
                    status: 'success',
                    resourceType: 'operation_run',
                    resourceId: (string) $run->getKey(),
                );

                $this->line(sprintf(
                    'Workspace %d run #%d queued (%d job(s)).',
                    (int) $workspace->getKey(),
                    (int) $run->getKey(),
                    $workspaceJobs,
                ));
            }

            $this->info(sprintf('Backfill jobs dispatched: %d', $dispatchedJobs));

            return self::SUCCESS;
        } finally {
            $lock->release();
        }
    }

    /**
     * @return array<int, string>
     */
    private function resolveTables(): array
    {
        $selectedTable = $this->option('table');

        if (! is_string($selectedTable) || trim($selectedTable) === '') {
            return TenantOwnedTables::all();
        }

        $selectedTable = trim($selectedTable);

        if (! TenantOwnedTables::contains($selectedTable)) {
            $this->error(sprintf('Unknown tenant-owned table: %s', $selectedTable));

            return [];
        }

        return [$selectedTable];
    }

    private function normalizeMaxRows(): ?int
    {
        $maxRows = $this->option('max-rows');

        if (! is_numeric($maxRows)) {
            return null;
        }

        $maxRows = (int) $maxRows;

        return $maxRows > 0 ? $maxRows : null;
    }

    /**
     * @param  array<int, string>  $tables
     * @return array<int, array{table: string, missing: int, unresolvable: int, sample_ids: array<int, int>}>
     */
    private function collectTableStats(array $tables): array
    {
        $stats = [];

        foreach ($tables as $table) {
            $missing = (int) DB::table($table)->whereNull('workspace_id')->count();

            $unresolvableQuery = DB::table($table)
                ->leftJoin('tenants', 'tenants.id', '=', sprintf('%s.tenant_id', $table))
                ->whereNull(sprintf('%s.workspace_id', $table))
                ->where(function ($query): void {
                    $query->whereNull('tenants.id')
                        ->orWhereNull('tenants.workspace_id');
                });

            $unresolvable = (int) $unresolvableQuery->count();

            $sampleIds = DB::table($table)
                ->leftJoin('tenants', 'tenants.id', '=', sprintf('%s.tenant_id', $table))
                ->whereNull(sprintf('%s.workspace_id', $table))
                ->where(function ($query): void {
                    $query->whereNull('tenants.id')
                        ->orWhereNull('tenants.workspace_id');
                })
                ->orderBy(sprintf('%s.id', $table))
                ->limit(5)
                ->pluck(sprintf('%s.id', $table))
                ->map(static fn (mixed $id): int => (int) $id)
                ->values()
                ->all();

            $stats[] = [
                'table' => $table,
                'missing' => $missing,
                'unresolvable' => $unresolvable,
                'sample_ids' => $sampleIds,
            ];
        }

        return $stats;
    }

    /**
     * @param  array<int, string>  $tables
     * @return array<int, array{total: int, tables: array<string, int>}>
     */
    private function collectWorkspaceWorkloads(array $tables, ?int $maxRows): array
    {
        $workloads = [];

        foreach ($tables as $table) {
            $rows = DB::table($table)
                ->join('tenants', 'tenants.id', '=', sprintf('%s.tenant_id', $table))
                ->whereNull(sprintf('%s.workspace_id', $table))
                ->whereNotNull('tenants.workspace_id')
                ->selectRaw('tenants.workspace_id as workspace_id, COUNT(*) as row_count')
                ->groupBy('tenants.workspace_id')
                ->get();

            foreach ($rows as $row) {
                $workspaceId = (int) $row->workspace_id;

                if ($workspaceId <= 0) {
                    continue;
                }

                $rowCount = (int) $row->row_count;

                if ($maxRows !== null) {
                    $rowCount = min($rowCount, $maxRows);
                }

                if ($rowCount <= 0) {
                    continue;
                }

                if (! isset($workloads[$workspaceId])) {
                    $workloads[$workspaceId] = [
                        'total' => 0,
                        'tables' => [],
                    ];
                }

                $workloads[$workspaceId]['tables'][$table] = $rowCount;
                $workloads[$workspaceId]['total'] += $rowCount;
            }
        }

        return $workloads;
    }
}