<?php

namespace App\Http\Controllers\Api;

use App\Http\Controllers\Controller;
use App\Http\Requests\StoreTaskRequest;
use App\Http\Requests\UpdateTaskRequest;
use App\Http\Resources\TaskResource;
use App\Models\Task;
use Illuminate\Http\Request;

class TaskController extends Controller
{
    public function index(Request $request)
    {
        $query = Task::with(['project', 'comments']);

        if ($request->filled('status')) {
            $query->where('status', $request->string('status'));
        }

        if ($request->filled('project_id')) {
            $query->where('project_id', $request->integer('project_id'));
        }

        if ($request->filled('priority')) {
            $query->where('priority', $request->integer('priority'));
        }

        if ($request->boolean('due_soon')) {
            $query->dueSoon($request->integer('days', 3));
        }

        if ($request->boolean('overdue')) {
            $query->overdue();
        }

        $tasks = $query->orderBy('priority', 'desc')->orderBy('created_at')->get();

        return TaskResource::collection($tasks);
    }

    public function store(StoreTaskRequest $request)
    {
        $task = Task::create($request->validated());

        return (new TaskResource($task))
            ->response()
            ->setStatusCode(201);
    }

    public function show(Request $request, Task $task)
    {
        $task->load(['project', 'comments']);

        return new TaskResource($task);
    }

    public function update(UpdateTaskRequest $request, Task $task)
    {
        // Handle status transitions
        $validated = $request->validated();

        // Auto-set timestamps based on status
        if (isset($validated['status'])) {
            if ($validated['status'] === 'in_progress' && ! $task->started_at) {
                $validated['started_at'] = now();
            }
            if (in_array($validated['status'], ['done', 'completed']) && ! $task->completed_at) {
                $validated['completed_at'] = now();
            }
            if ($validated['status'] !== 'in_progress') {
                $validated['started_at'] = null;
            }
        }

        $task->update($validated);

        return new TaskResource($task->fresh(['project', 'comments']));
    }

    public function destroy(Task $task)
    {
        $task->delete();

        return response()->noContent();
    }

    /**
     * Get comments for a task.
     */
    public function comments(Request $request, Task $task)
    {
        $comments = $task->comments()->orderBy('created_at')->get();

        return TaskCommentResource::collection($comments);
    }

    /**
     * Change task status.
     */
    public function changeStatus(Request $request, Task $task)
    {
        $request->validate([
            'status' => ['required', 'string', 'in:' . implode(',', Task::STATUSES)],
        ]);

        $status = $request->string('status');

        $updateData = ['status' => $status];

        // Auto-set timestamps
        if ($status === 'in_progress' && ! $task->started_at) {
            $updateData['started_at'] = now();
        }
        if (in_array($status, ['done', 'completed']) && ! $task->completed_at) {
            $updateData['completed_at'] = now();
        }
        if ($status !== 'in_progress') {
            $updateData['started_at'] = null;
        }

        $task->update($updateData);

        return new TaskResource($task->fresh(['project', 'comments']));
    }
}