construprogress/app/Livewire/PhaseGantt.php

<?php
namespace App\Livewire;
use Livewire\Component;
use Livewire\Attributes\Layout;
use App\Models\Project;
use Illuminate\Support\Facades\Auth;

#[Layout('layouts.app')]
class PhaseGantt extends Component
{
    public Project $project;
    public $ganttData = [];

    public function mount(Project $project)
    {
        $user = Auth::user();
        if (!$user->can('manage all') && !$project->users()->where('user_id', $user->id)->exists()) {
            abort(403);
        }
        $this->project = $project;
        $this->loadGanttData();
    }

    public function loadGanttData()
    {
        $phases = $this->project->phases()->with(['layers.features'])->orderBy('order')->get();
        $projectStart = $this->project->start_date ?? now()->startOfMonth();
        $projectEnd   = $this->project->end_date_estimated ?? now()->addMonths(6);

        $this->ganttData = $phases->map(function($phase) use ($projectStart, $projectEnd) {
            $planned_start = $phase->planned_start ?? $projectStart;
            $planned_end   = $phase->planned_end   ?? $projectEnd;
            $actual_start  = $phase->actual_start;
            $actual_end    = $phase->actual_end;

            $totalDays = max(1, $projectStart->diffInDays($projectEnd));

            $pStartOffset = max(0, $projectStart->diffInDays($planned_start));
            $pDuration    = max(1, $planned_start->diffInDays($planned_end));
            $pStartPct    = round(($pStartOffset / $totalDays) * 100, 2);
            $pWidthPct    = round(($pDuration    / $totalDays) * 100, 2);

            $aStartPct = null; $aWidthPct = null;
            if ($actual_start) {
                $aStart    = max(0, $projectStart->diffInDays($actual_start));
                $aEnd      = $actual_end ?? now();
                $aDuration = max(1, $actual_start->diffInDays($aEnd));
                $aStartPct = round(($aStart    / $totalDays) * 100, 2);
                $aWidthPct = round(($aDuration / $totalDays) * 100, 2);
            }

            $isDelayed = $phase->planned_end && $phase->planned_end->isPast() && $phase->progress_percent < 100;

            return [
                'id'             => $phase->id,
                'name'           => $phase->name,
                'color'          => $phase->color ?? '#3b82f6',
                'progress'       => $phase->progress_percent,
                'planned_start'  => $planned_start->format('d/m/Y'),
                'planned_end'    => $planned_end->format('d/m/Y'),
                'actual_start'   => $actual_start?->format('d/m/Y'),
                'actual_end'     => $actual_end?->format('d/m/Y'),
                'p_start_pct'    => $pStartPct,
                'p_width_pct'    => min($pWidthPct, 100 - $pStartPct),
                'a_start_pct'    => $aStartPct,
                'a_width_pct'    => $aWidthPct ? min($aWidthPct, 100 - $aStartPct) : null,
                'is_delayed'     => $isDelayed,
                'features_count' => $phase->layers->sum(fn($l) => $l->features->count()),
            ];
        })->toArray();
    }

    public function updatePhaseDates($phaseId, $plannedStart, $plannedEnd, $actualStart = null, $actualEnd = null)
    {
        $phase = $this->project->phases()->findOrFail($phaseId);
        $phase->update([
            'planned_start' => $plannedStart ?: null,
            'planned_end'   => $plannedEnd   ?: null,
            'actual_start'  => $actualStart  ?: null,
            'actual_end'    => $actualEnd    ?: null,
        ]);
        $this->loadGanttData();
        $this->dispatch('notify', 'Fechas actualizadas');
    }

    public function render()
    {
        return view('livewire.projects.phase-gantt', [
            'project' => $this->project,
            'phases'  => $this->project->phases()->orderBy('order')->get(),
        ]);
    }
}