<?php

namespace Modules\TimelineScheduling\Http\Controllers;

use App\Http\Controllers\Controller;
use Illuminate\Http\Request;
use Modules\ProjectManagement\Enums\WeatherCondition;
use Modules\ProjectManagement\Models\Project;
use Modules\ProjectManagement\Models\ProjectMilestone;

class MilestoneController extends Controller
{
    public function index(Request $request)
    {
        $projectUlid = $request->query('project');
        $project = null;

        if ($projectUlid) {
            $project = Project::where('ulid', $projectUlid)->firstOrFail();
            $project->load([
                'tasks' => fn ($q) => $q->select('id', 'project_id')->with('delays'),
                'milestones' => fn ($q) => $q->with(['tasks.taskMaterials.material']),
            ]);
        }

        return \Inertia\Inertia::render('TimelineScheduling::Timeline/Index', [
            'project' => $project,
            'projects' => Project::with('parentProject:id,ulid,name,code')->get(['id', 'ulid', 'name', 'code', 'project_type', 'parent_project_id']),
            'milestones' => $project ? $project->milestones->map(function ($m) {
                $tasks = $m->tasks;
                
                // Job done calculation
                if ($tasks->isEmpty()) {
                    $jobDone = $m->actual_date !== null ? 100.0 : 0.0;
                } else {
                    $jobDone = round($tasks->avg('completion_percentage') ?? 0, 2);
                }

                // Materials Spent and Planned calculations
                $totalPlannedCost = 0.0;
                $totalActualCost = 0.0;
                $materialsMap = [];

                foreach ($tasks as $task) {
                    foreach ($task->taskMaterials as $tm) {
                        $plannedCost = (float) $tm->planned_qty * (float) $tm->unit_cost;
                        $actualCost = (float) $tm->actual_qty * (float) $tm->unit_cost;
                        
                        $totalPlannedCost += $plannedCost;
                        $totalActualCost += $actualCost;

                        $matId = $tm->material_id;
                        $matName = $tm->material->name ?? 'Unknown Material';
                        $matUnit = $tm->material->unit ?? 'pcs';

                        if (!isset($materialsMap[$matId])) {
                            $materialsMap[$matId] = [
                                'material_id' => $matId,
                                'name' => $matName,
                                'unit' => $matUnit,
                                'planned_qty' => 0.0,
                                'actual_qty' => 0.0,
                                'planned_cost' => 0.0,
                                'actual_cost' => 0.0,
                            ];
                        }

                        $materialsMap[$matId]['planned_qty'] += (float) $tm->planned_qty;
                        $materialsMap[$matId]['actual_qty'] += (float) $tm->actual_qty;
                        $materialsMap[$matId]['planned_cost'] += $plannedCost;
                        $materialsMap[$matId]['actual_cost'] += $actualCost;
                    }
                }

                $materialsDetail = array_values($materialsMap);
                $materialsSpentPercentage = $totalPlannedCost > 0 
                    ? round(($totalActualCost / $totalPlannedCost) * 100, 2) 
                    : 0.0;

                return array_merge($m->toArray(), [
                    'is_completed' => $m->is_completed,
                    'is_overdue' => $m->is_overdue,
                    'status' => $m->status,
                    'status_color' => $m->status_color,
                    'days_delayed' => $m->days_delayed,
                    'job_done_percentage' => $jobDone,
                    'total_planned_materials_cost' => $totalPlannedCost,
                    'total_actual_materials_cost' => $totalActualCost,
                    'materials_spent_percentage' => $materialsSpentPercentage,
                    'materials_detail' => $materialsDetail,
                    'has_tasks_or_materials' => !$tasks->isEmpty() || $totalPlannedCost > 0,
                ]);
            }) : [],
            'milestoneStats' => $project ? [
                'total' => $project->milestones->count(),
                'completed' => $project->milestones->where('actual_date', '!=', null)->count(),
                'completion_percentage' => $project->milestone_completion,
                'weather_delay_days' => $project->weather_delay_days,
            ] : null,
            'weatherConditions' => collect(WeatherCondition::cases())->map(fn ($c) => [
                'value' => $c->value,
                'label' => $c->label(),
                'icon' => $c->icon(),
            ]),
            'allowedTransitions' => $project ? collect($project->status->allowedTransitions())->map(fn ($s) => [
                'value' => $s->value,
                'label' => $s->label(),
            ]) : [],
        ]);
    }

    public function store(Request $request)
    {
        $validated = $request->validate([
            'project_id' => 'required|exists:projects,id',
            'name' => 'required|string|max:255',
            'description' => 'nullable|string',
            'planned_date' => 'nullable|date',
            'weight_percentage' => 'required|numeric|min:0|max:100',
        ]);

        $project = Project::findOrFail($validated['project_id']);
        $validated['sort_order'] = $project->milestones()->count();
        $validated['is_default'] = false;

        ProjectMilestone::create($validated);

        return back()->with('success', 'Milestone added.');
    }

    public function update(Request $request, ProjectMilestone $milestone)
    {
        $validated = $request->validate([
            'name' => 'sometimes|required|string|max:255',
            'description' => 'nullable|string',
            'planned_date' => 'nullable|date',
            'actual_date' => 'nullable|date',
            'weight_percentage' => 'sometimes|numeric|min:0|max:100',
            'weather_impacted' => 'sometimes|boolean',
            'weather_condition' => 'nullable|string',
            'weather_delay_days' => 'sometimes|integer|min:0',
            'weather_notes' => 'nullable|string|max:2000',
        ]);

        // Clear weather fields if not impacted
        if (isset($validated['weather_impacted']) && !$validated['weather_impacted']) {
            $validated['weather_condition'] = null;
            $validated['weather_delay_days'] = 0;
            $validated['weather_notes'] = null;
        }

        $milestone->update($validated);

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

    public function destroy(ProjectMilestone $milestone)
    {
        $milestone->delete();

        return back()->with('success', 'Milestone removed.');
    }
}