<?php
   
    class Post_model extends CI_Model {
        public function __construct(){
            $this->load->database();
        }
        
        //this is the function to get the posts
        public function get_posts($slug = FALSE, $limit = FALSE, $offset = FALSE){
            if($limit){
                $this->db->limit($limit,$offset);
            }
            if($slug === FALSE){
                $this->db->order_by('posts.id','DESC');
                $this->db->join('categories','categories.id = posts.category_id');
              $query = $this->db->get('posts');
              return $query->result_array();
            }
            $query = $this->db->get_where('posts', array('slug' => $slug));
            return $query->row_array();
        }

        //function to create posts
        public function create_post($post_image){
            $slug = url_title($this->input->post('title'));
            $data = array(
                'title' => $this->input->post('title'),
                'slug'  => $slug,
                'body'  => $this->input->post('body'),
                'category_id' => $this->input->post('category_id'),
                'user_id' => $this->session->userdata('user_id'),
                'post_image' => $post_image
            );
            return $this->db->insert('posts', $data);
        }

        //function to delete posts
        public function delete_post($id){
            $this->db->where('id', $id);
            $this->db->delete('posts');
            return true;
        }

        //function to update posts
        public function update_post(){
            //the post method of codeigniter retrieves the data from the POST when we submit the input
            $slug = url_title($this->input->post('title'));
            $data = array(
                'title' => $this->input->post('title'),
                'slug'  => $slug,
                'body'  => $this->input->post('body')
            );
            $this->db->where('id',$this->input->post('id'));
            return $this->db->update('posts', $data);
            //update is an inbuilt codeigniter method
        }

        public function get_categories(){
            $this->db->order_by('name');
            $query = $this->db->get('categories');
            return $query->result_array();
        }

        public function get_posts_by_category($category_id){
            $this->db->order_by('category_id','DESC');
            $this->db->join('categories','categories.id = posts.category_id');
            $query = $this->db->get_where('posts', array('category_id' => $category_id));
            return $query->result_array();
        }

    }