<?php

declare(strict_types=1);

namespace App\Actions\Automation\Run;

use App\Enums\Automation\Run\Status;
use App\Jobs\Automation\ProcessAutomationNode;
use App\Models\Automation;
use App\Models\AutomationRun;

class AdvanceAutomationRun
{
    public function __invoke(AutomationRun $run, string $fromNodeId, string $handle = 'default'): void
    {
        $targets = $this->targetsFor($run->automation, $fromNodeId, $handle);

        if ($targets === []) {
            $run->update([
                'status' => Status::Completed,
                'finished_at' => now(),
                'current_node_id' => null,
                'error' => [
                    'reason' => 'no_matching_edge',
                    'handle' => $handle,
                    'node_id' => $fromNodeId,
                ],
            ]);

            return;
        }

        $this->dispatchBranches($run, $targets);
    }

    /**
     * Every node id connected to `$fromNodeId` via the given handle. A node can
     * fan out to several targets (e.g. a trigger calling RSS and HTTP at once).
     *
     * @return array<int, string>
     */
    public function targetsFor(Automation $automation, string $fromNodeId, string $handle = 'default'): array
    {
        return collect($automation->connections ?? [])
            ->filter(fn ($c) => data_get($c, 'source') === $fromNodeId && data_get($c, 'source_handle', 'default') === $handle)
            ->pluck('target')
            ->filter()
            ->values()
            ->all();
    }

    /**
     * Continues the run on the first branch and forks a sibling run — sharing the
     * accumulated context — for every additional branch, so all targets execute.
     *
     * @param  array<int, string>  $targets
     */
    public function dispatchBranches(AutomationRun $run, array $targets): void
    {
        $first = array_shift($targets);

        foreach ($targets as $target) {
            $sibling = AutomationRun::create([
                'automation_id' => $run->automation_id,
                'root_run_id' => $run->rootId(),
                'trigger_item_id' => $run->trigger_item_id,
                'generated_post_id' => $run->generated_post_id,
                'is_manual' => $run->is_manual,
                'is_dry_run' => $run->is_dry_run,
                'status' => Status::Pending,
                'context' => $run->context,
            ]);

            ProcessAutomationNode::dispatch($sibling, $target);
        }

        ProcessAutomationNode::dispatch($run, $first);
    }
}