<?php

namespace Modules\TimelineScheduling\Http\Controllers;

use App\Http\Controllers\Controller;
use Illuminate\Http\Request;
use Inertia\Inertia;
use Modules\ProjectManagement\Models\Project;
use Modules\ProjectManagement\Models\Task;
use Modules\TimelineScheduling\Models\Milestone;
use Modules\TimelineScheduling\Models\TaskDependency;
use Modules\TimelineScheduling\Services\GanttDataTransformer;

class ScheduleController extends Controller
{
    public function __construct(
        private GanttDataTransformer $ganttTransformer,
    ) {}

    // --- Gantt view for a project ---
    public function gantt(Project $project)
    {
        $ganttData = $this->ganttTransformer->transform($project->id);
        $milestones = Milestone::where('project_id', $project->id)->orderBy('target_date')->get();
        $tasks = Task::where('project_id', $project->id)->select('id', 'ulid', 'name')->get();

        return Inertia::render('TimelineScheduling::Schedule/Gantt', [
            'project' => $project->only('id', 'ulid', 'name', 'code'),
            'ganttData' => $ganttData,
            'milestones' => $milestones,
            'tasks' => $tasks,
        ]);
    }

    // --- API: Gantt JSON data ---
    public function ganttData(Project $project)
    {
        return response()->json($this->ganttTransformer->transform($project->id));
    }

    // --- Update task schedule (drag-and-drop) ---
    public function updateSchedule(Request $request, Project $project, Task $task)
    {
        $validated = $request->validate([
            'start_date' => 'required|date',
            'end_date' => 'required|date|after_or_equal:start_date',
        ]);

        $task->update($validated);

        return response()->json(['success' => true]);
    }

    // --- Dependencies ---
    public function storeDependency(Request $request)
    {
        $validated = $request->validate([
            'task_id' => 'required|string',
            'predecessor_id' => 'required|string|different:task_id',
            'dependency_type' => 'required|in:FS,FF,SS,SF',
            'lag_days' => 'nullable|integer',
        ]);

        $taskId = Task::resolveUlidToId($validated['task_id']);
        $predecessorId = Task::resolveUlidToId($validated['predecessor_id']);

        TaskDependency::updateOrCreate(
            ['task_id' => $taskId, 'predecessor_id' => $predecessorId],
            ['dependency_type' => $validated['dependency_type'], 'lag_days' => $validated['lag_days'] ?? 0],
        );

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

    public function destroyDependency(TaskDependency $dependency)
    {
        $dependency->delete();
        return back()->with('success', 'Dependency removed.');
    }

    // --- Milestones ---
    public function storeMilestone(Request $request)
    {
        $validated = $request->validate([
            'project_id' => 'required|string',
            'name' => 'required|string|max:255',
            'description' => 'nullable|string',
            'target_date' => 'required|date',
            'is_critical' => 'nullable|boolean',
        ]);

        $validated['project_id'] = Project::resolveUlidToId($validated['project_id']);

        Milestone::create($validated);

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

    public function achieveMilestone(Milestone $milestone)
    {
        $milestone->update(['achieved_date' => now()->toDateString()]);
        return back()->with('success', 'Milestone marked as achieved.');
    }

    public function destroyMilestone(Milestone $milestone)
    {
        $milestone->delete();
        return back()->with('success', 'Milestone deleted.');
    }
}