autocde2.0/app/Services/Project/ProjectGanttService.php

<?php

namespace App\Services\Project;

use App\Http\Resources\API\ProjectGanttResource;
use App\Http\Resources\API\ProjectGroupViewTaskResource;
use App\Models\Enums\ProjectStatus;
use App\Models\Project;
use App\Models\Requirement;
use App\Models\Task;
use App\Models\User;
use Illuminate\Support\Collection;

class ProjectGanttService
{
    public function gantt(Project $project, string $group): array
    {
        $groupTasks = $this->getGroupTask($project, $group);

        $groups = $groupTasks->keys()->filter();

        $groupNamesKeyBy = $this->getGroupNamesKeyBy($groups, $group);

        $items = [];
        foreach(["", ...$groups] as $groupKey) {
            if (! isset($groupTasks[$groupKey])) {
                continue;
            }

            $items[] = [
                'group' => $group,
                'group_label' => $groupKey == "" ? ['id' => "", "name" => ""] : $groupNamesKeyBy[$groupKey],
                'tasks' => ProjectGanttResource::collection($groupTasks[$groupKey]),
            ];
        }

        return $items;
    }

    protected function getGroupNamesKeyBy(Collection $groups, string $group): array
    {
        $groupsFormat = $groups->map(fn($group) => ['id' => $group, 'name' => $group]);
        $groupNames = match ($group) {
            "requirement_id" => Requirement::query()->whereIn("id", $groups)->selectRaw("id,title as name")->get(),
            "task_type" => $groupsFormat,
            "assign" => User::query()->whereIn("id", $groups)->get(['id', 'name']),
        };

        return $groupNames->keyBy("id")->toArray();
    }

    protected function getGroupTask(
        Project $project,
        string $group,
    ): \Illuminate\Database\Eloquent\Collection|\Illuminate\Support\Collection|array
    {
        return Task::query()
            ->with(['assignTo', 'finishedBy'])
            ->where("project_id", $project->id)
            ->get()
            ->groupBy($group);
    }
}