<?php

    /**
     * Description of ORM
     *
     * @author Lucas Awade
     */
    class ORM {

        private $query;
        private $table;
        private $allTables = [];
        private $columns;
        private $id;

        /**
         * $table -> table name
         * $id -> identificador ou Primary Key
         * @param string $table
         * @param string $id
         */
        function __construct($table, $id) {
            $this->setAllTables($id, $table);
            $this->table = $table;
            $this->id = $id;
        }

        /**
         * Exemplo:
         * CALL -> find('23')
         * 
         * @param int|string $id
         * @param array $columns
         * @return string
         */
        function find($id, $columns = []) {
            $this->columns = $columns ? implode(',', $columns) : '*';
            return $this->query("SELECT $this->columns FROM {$this->table} WHERE {$this->id} = '$id';");
        }

        /**
         * Exemplo
         * $where = [
         *      ['column', 'operator', 'value']
         * ];
         * 
         * CALL -> findWhere([['calldate', '=', '2021-09-09']],['id', 'calldate'])
         * 
         * @param type $where
         * @param type $columns
         */
        function findWhere($where, $columns = []) {
            $this->columns = $columns ? implode(',', $columns) : '*';
            return $this->query("SELECT $this->columns FROM {$this->table} WHERE 1=1 {$this->getWhere($where)};");
        }

        /**
         * CALL -> findAll();
         * @param array $columns
         * @return string
         */
        function findAll($columns = []) {
            $this->columns = $columns ? implode(',', $columns) : '*';
            return $this->query("SELECT $this->columns FROM {$this->table};");
        }

        function findAndImport() {
            
        }

        function findAndExport() {
            
        }

        /**
         * $relations = [
         *    ['table1', 'id_table1', 'id_table2']
         * ]
         * 
         * $relations = ['table1', 'id_table1', 'id_table2']
         * 
         * CALL -> selectJoin(
         *  [
         *      ['inner','pbx_eventos_dacs b', 'b.uid2', 'a.uniqueid'],
         *      ['left','pbx_classificao c', 'c.uniqueid', 'a.uniqueid'],
         *      ['rigth','pbx_queue d', 'd.nome', 'b.fila'],
         *      ['inner','pbx_protocolo_reg h', 'h.uniqueid', 'a.uniqueid']
         *  ], 
         *  [['calldate', '2021-09-09'], ['dcontext', 'ROTASAINTE'], ['tipo_ligacao' , '33']], 
         *  ['calldate', 'uniqueid', 'dst','src', 'tipo_ligacao']);
         * 
         * @param array $relations
         */
        function selectJoin($relations, $where = [], $columns = []) {
            $selectColumns = count($columns) > 1 ? implode(',', $this->nickTable(array_values($columns))) : '*';
            $tableMain = $this->getAllTables($this->table);

            $inner = "SELECT $selectColumns \nFROM {$tableMain['name']} {$tableMain['nick']} \n";
            if ($this->isMultidimensional($relations)) {
                foreach ($relations as $value) {
                    $this->setAllTables($value[2], $value[1]);
                    $table = $this->getAllTables($value[1]);
                    $onJoin = $value[3] ? $this->nickTable($value[3]) : $tableMain['nick'] . "." . $tableMain['id'];
                    $inner .= $this->getRelations($value[0]) . " JOIN {$table['name']} {$table['nick']} ON {$table['nick']}.{$table['id']} = $onJoin\n";
                }
            } else {
                $this->setAllTables($relations[2], $relations[1]);
                $table = $this->getAllTables($relations[1]);
                $onJoin = $relations[3] ? $this->nickTable($relations[3]) : $tableMain['nick'] . "." . $tableMain['id'];
                $inner .= $this->getRelations(strtoupper($relations[0])) . " JOIN {$table['name']} {$table['nick']} ON {$table['nick']}.{$table['id']} = $onJoin\n";
            }
            $inner .= $this->getWhere($where);
            return $this->query($inner);
        }

        /**
         * $columns = ['column', 'value']
         * @param array $columns
         */
        function create($columns) {
            return $this->query("INSERT INTO {$this->table} (" . implode(',', array_keys($columns)) . ") VALUES('" . implode("','", array_values($columns)) . "'); ");
        }

        /**
         * $update [
         *    ['column' => 'value']
         * ]
         * 
         * $where = [
         *      ['column', 'operator', 'value']
         * ];
         * 
         * @param type $update
         */
        function update($update, $where = []) {
            $sets = [];
            foreach ($update as $data) {
                array_push($sets, sprintf("%s = '%s'", array_keys($data)[0], array_values($data)[0]));
            }
            return $this->query("UPDATE {$this->table} SET " . implode(',', $sets) . $this->getWhere($where) . ";");
        }

        /**
         * $notwhere -> secure to delete all register without filter 
         * 
         * CALL -> delete(['id', '=', 15, 'calldate', '>', '2021-09-01']);
         * CALL (SECURE)-> delete([], true);
         * 
         * @param array $where
         * @param bool $notwhere
         * @return boolean
         */
        function delete($where, $notwhere = false) {
            if ($where || $notwhere) {
                return $this->query("DELETE FROM {$this->table} " . $this->getWhere($where));
            }
            return false;
        }
        
        function limit($limit){
            if(!$this->query){
                return null;
            }
            return $this->query($this->query . " LIMIT $limit");
        }
        
        function orderby($order, $type = 'ASC'){
            if(!$this->query){
                return null;
            }
            if(is_array($order)){
                $columns = [];
                foreach ($order as $column){
                    $columns[] = $this->nickTable($column);
                }
                $order = implode(',', $columns);
            }
            return $this->query($this->query . " ORDER BY $order $type");
        }

        ########################################################################

        function setTable($table) {
            $this->table = $table;
        }

        function setColumns($columns) {
            $this->columns = $columns;
        }

        function setId($id) {
            $this->id = $id;
        }
        
        function query($query = null){
            if($query){
                $this->query = $query;
            }
            return $this->query;
        }

        ########################################################################

        private function getRelations($relation) {
            $relations = ['INNER', 'LEFT', 'RIGHT', 'FULL OUTER', 'FULL'];
            if (in_array($relation, $relations)) {
                return strtoupper($relation);
            }
            return 'INNER';
        }

        private function getOperators() {
            return ['=', '>=', '<=', '>', '<', '<>', '!=', '!<', '>!', 'LIKE', 'ILIKE', 'IN', 'BETWEEN'];
        }

        private function isMultidimensional($array) {
            return count($array) !== count($array, COUNT_RECURSIVE);
        }

        private function getWhere($where) {
            $whereAnd = "";
            if ($where) {
                $ands = function($condition) {
                    if (in_array(strtoupper($condition[1]), $this->getOperators())) {
                        $operator = $condition[1];
                        $value = $condition[2];
                    } else {
                        $operator = '=';
                        $value = $condition[1];
                    }
                    return [$operator, $value];
                };

                $whereAnd = " WHERE 1=1 ";
                if (!$this->isMultidimensional($where)) {
                    $operador = $ands($where);
                    $whereAnd .= " AND {$this->nickTable($where[0])} {$operador[0]} '{$operador[1]}'";
                } else {
                    foreach ($where as $condition) {
                        $operador = $ands($condition);
                        $whereAnd .= " AND {$this->nickTable($condition[0])} {$operador[0]} '{$operador[1]}'";
                    }
                }
            }
            return $whereAnd;
        }

        private function setAllTables($id, $table, $columnRelation = '') {
            if ($this->getAllTables($table)) {
                return;
            }

            $count = 1;
            while ($count <= 26) {
                $nick = strtolower($this->randLetter());
                if ($nick && !array_key_exists($nick, $this->allTables)) {
                    break;
                }
                $count++;
            }

            $this->allTables[$nick] = ['id' => $id, 'name' => $table, 'columnRelation' => $columnRelation, 'nick' => $nick];
        }

        private function nickTable($capture) {
            if (is_array($capture)) {
                $columns = [];
                foreach ($capture as $column){
                    $columns[] = $this->nickTable($column);
                }
                return $columns;
            } else {
                $search = explode('.', $capture);
                $tables = $this->getAllTables($search[0]);
                if ($tables) {
                    return "{$tables['nick']}.{$search[1]}";
                }
            }
            return $capture;
        }

        private function getAllTables($table) {
            foreach ($this->allTables as $tables) {
                if ($table == $tables['name']) {
                    return $tables;
                }
            }
            return null;
        }

        private function randLetter() {
            $alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
            $arrayAlpha = str_split($alphabet);
            $rand = rand(1, count($arrayAlpha));
            return $arrayAlpha[$rand];
        }

    }