<?php

namespace Modules\TaskManagement\Http\Controllers;

use App\Http\Controllers\Controller;
use Illuminate\Http\Request;
use Modules\MasterData\Models\Material;
use Modules\MaterialLogistics\Models\PurchaseOrder;
use Modules\ProjectManagement\Models\Project;
use Modules\ProjectManagement\Models\Task;
use Modules\ProjectManagement\Models\TaskMaterial;

class TaskMaterialController extends Controller
{
    public function store(Request $request, Project $project, Task $task)
    {
        $validated = $request->validate([
            'material_id' => 'required|string',
            'purchase_order_id' => 'nullable|string',
            'planned_qty' => 'required|numeric|min:0.01',
            'actual_qty' => 'nullable|numeric|min:0',
            'notes' => 'nullable|string|max:500',
        ]);

        $material = Material::where('ulid', $validated['material_id'])->firstOrFail();

        $poId = null;
        if (!empty($validated['purchase_order_id'])) {
            $po = PurchaseOrder::where('ulid', $validated['purchase_order_id'])->firstOrFail();

            if ($po->status !== 'approved') {
                return back()->with('error', 'Only materials from approved Purchase Orders can be assigned.');
            }

            if (!$po->items()->where('material_id', $material->id)->exists()) {
                return back()->with('error', 'This material is not part of the selected Purchase Order.');
            }

            $poId = $po->id;
        }

        // Prevent duplicate material per task
        if ($task->taskMaterials()->where('material_id', $material->id)->exists()) {
            return back()->with('error', 'This material is already assigned to this task.');
        }

        $task->taskMaterials()->create([
            'material_id' => $material->id,
            'purchase_order_id' => $poId,
            'planned_qty' => $validated['planned_qty'],
            'actual_qty' => $validated['actual_qty'] ?? 0,
            'unit_cost' => $material->unit_cost,
            'notes' => $validated['notes'] ?? null,
        ]);

        $project->load('tasks.taskMaterials');
        $project->recalculateCapitalization();

        return back()->with('success', 'Material added to task.');
    }

    public function storeBulk(Request $request, Project $project, Task $task)
    {
        $validated = $request->validate([
            'purchase_order_id' => 'nullable|string',
            'materials' => 'required|array|min:1',
            'materials.*.material_id' => 'required|string',
            'materials.*.planned_qty' => 'required|numeric|min:0.01',
        ]);

        $poId = null;
        if (!empty($validated['purchase_order_id'])) {
            $po = PurchaseOrder::where('ulid', $validated['purchase_order_id'])->firstOrFail();

            if ($po->status !== 'approved') {
                return back()->with('error', 'Only materials from approved Purchase Orders can be assigned.');
            }

            $poId = $po->id;
        }

        $added = 0;

        foreach ($validated['materials'] as $entry) {
            $material = Material::where('ulid', $entry['material_id'])->firstOrFail();

            if ($task->taskMaterials()->where('material_id', $material->id)->exists()) {
                continue;
            }

            $task->taskMaterials()->create([
                'material_id' => $material->id,
                'purchase_order_id' => $poId,
                'planned_qty' => $entry['planned_qty'],
                'actual_qty'  => 0,
                'unit_cost'   => $material->unit_cost,
            ]);

            $added++;
        }

        $project->load('tasks.taskMaterials');
        $project->recalculateCapitalization();

        return back()->with('success', "{$added} material(s) added to task.");
    }

    public function update(Request $request, Project $project, Task $task, TaskMaterial $taskMaterial)
    {
        $validated = $request->validate([
            'planned_qty' => 'nullable|numeric|min:0',
            'actual_qty' => 'nullable|numeric|min:0',
            'notes' => 'nullable|string|max:500',
        ]);

        $taskMaterial->update(array_filter($validated, fn ($v) => $v !== null));

        $project->load('tasks.taskMaterials');
        $project->recalculateCapitalization();

        return back()->with('success', 'Task material updated.');
    }

    public function destroy(Project $project, Task $task, TaskMaterial $taskMaterial)
    {
        $taskMaterial->delete();

        $project->load('tasks.taskMaterials');
        $project->recalculateCapitalization();

        return back()->with('success', 'Material removed from task.');
    }
}