<?php

namespace App\Modules\Academic\Controllers;

use App\Core\BaseApiController;
use App\Modules\Academic\Models\LessonSlotModel;
use CodeIgniter\HTTP\ResponseInterface;

/**
 * Lesson Slot CRUD API (ADMIN only).
 */
class LessonSlotController extends BaseApiController
{
    protected LessonSlotModel $model;

    public function __construct()
    {
        $this->model = new LessonSlotModel();
    }

    /**
     * GET /api/academic/lesson-slots
     */
    public function index(): ResponseInterface
    {
        $slots = $this->model->orderBy('slot_number', 'ASC')->findAll();
        $data  = array_map([$this, 'slotToArray'], $slots);
        return $this->successResponse($data, 'Lesson slots');
    }

    /**
     * POST /api/academic/lesson-slots
     */
    public function create(): ResponseInterface
    {
        $input = $this->request->getJSON(true) ?? [];
        $data  = [
            'slot_number' => (int) ($input['slot_number'] ?? 0),
            'start_time'  => (string) ($input['start_time'] ?? ''),
            'end_time'    => (string) ($input['end_time'] ?? ''),
            'is_active'   => isset($input['is_active']) ? (int) (bool) $input['is_active'] : 1,
        ];

        if (!$this->model->validateStartBeforeEnd($data)) {
            return $this->errorResponse('End time must be after start time', null, null, 422);
        }

        $id = $this->model->insert($data);
        if ($id === false) {
            $msg = $this->model->errors()['end_time'] ?? implode(' ', $this->model->errors());
            return $this->errorResponse($msg ?: 'Validation failed', null, null, 422);
        }

        $row = $this->model->find($id);
        return $this->successResponse($this->slotToArray($row), 'Lesson slot created', null, 201);
    }

    /**
     * PUT /api/academic/lesson-slots/{id}
     */
    public function update($id): ResponseInterface
    {
        $id   = (int) $id;
        $slot = $this->model->find($id);
        if (!$slot) {
            return $this->errorResponse('Lesson slot not found', null, null, 404);
        }

        $input = $this->request->getJSON(true) ?? [];
        $data  = [];
        if (array_key_exists('slot_number', $input)) {
            $data['slot_number'] = (int) $input['slot_number'];
        }
        if (array_key_exists('start_time', $input)) {
            $data['start_time'] = (string) $input['start_time'];
        }
        if (array_key_exists('end_time', $input)) {
            $data['end_time'] = (string) $input['end_time'];
        }
        if (array_key_exists('is_active', $input)) {
            $data['is_active'] = (int) (bool) $input['is_active'];
        }

        if ($data !== [] && !$this->model->validateStartBeforeEnd(array_merge(
            ['start_time' => $data['start_time'] ?? $slot->start_time, 'end_time' => $data['end_time'] ?? $slot->end_time]
        ))) {
            return $this->errorResponse('End time must be after start time', null, null, 422);
        }

        $this->model->update($id, $data);
        if ($this->model->errors()) {
            return $this->errorResponse(implode(' ', $this->model->errors()), null, null, 422);
        }

        $row = $this->model->find($id);
        return $this->successResponse($this->slotToArray($row), 'Lesson slot updated');
    }

    /**
     * DELETE /api/academic/lesson-slots/{id}
     */
    public function delete($id): ResponseInterface
    {
        $id = (int) $id;
        if (!$this->model->find($id)) {
            return $this->errorResponse('Lesson slot not found', null, null, 404);
        }
        $this->model->delete($id);
        return $this->successResponse(null, 'Lesson slot deleted');
    }

    protected function slotToArray($slot): array
    {
        if (is_array($slot)) {
            return [
                'id'          => (int) ($slot['id'] ?? 0),
                'slot_number' => (int) ($slot['slot_number'] ?? 0),
                'start_time'  => (string) ($slot['start_time'] ?? ''),
                'end_time'    => (string) ($slot['end_time'] ?? ''),
            ];
        }
        return [
            'id'          => (int) $slot->id,
            'slot_number' => (int) $slot->slot_number,
            'start_time'  => (string) $slot->start_time,
            'end_time'    => (string) $slot->end_time,
        ];
    }
}