<?php

namespace Modules\ProjectProgress\Services;

use Modules\ProjectManagement\Models\Project;
use Modules\TaskManagement\Models\Task;

class ProjectProgressService
{
    /**
     * Calculate project progress dynamically using actual material consumed vs BOQ planned quantity.
     * Formula: sum((Actual Material Consumed / Planned BOQ) * Task Weight)
     */
    public function calculateProjectProgress(Project $project): float
    {
        $tasks = Task::where('project_id', $project->id)
            ->with(['materials'])
            ->get();

        if ($tasks->isEmpty()) {
            return 0.0;
        }

        $totalWeightedProgress = 0.0;
        $totalWeight = 0.0;

        foreach ($tasks as $task) {
            $taskWeight = $task->weight ?? 1.0;
            $totalWeight += $taskWeight;

            $plannedBoq = $task->materials->sum('planned_quantity');
            $consumedQty = $task->materials->sum('consumed_quantity');

            if ($plannedBoq > 0) {
                $materialProgress = min(1.0, $consumedQty / $plannedBoq);
                $totalWeightedProgress += ($materialProgress * 100) * $taskWeight;
            } else {
                // Fallback to task completion percentage if no BOQ material planned
                $taskProgress = $task->status === 'completed' ? 100 : ($task->progress_percentage ?? 0);
                $totalWeightedProgress += $taskProgress * $taskWeight;
            }
        }

        return $totalWeight > 0 ? round($totalWeightedProgress / $totalWeight, 2) : 0.0;
    }
}