<?php

namespace Luticate\Utils\DataAccess;
use Luticate\Utils\Business\LuStringUtils;

/**
 * Created by PhpStorm.
 * User: robin
 * Date: 6/10/16
 * Time: 11:05 AM
 */
class PgSqlDataAccess extends AbstractDbDataAccess
{
    public static $types = ["SERIAL" => "integer",
        "BIGSERIAL" => "integer",
        "abstime" => "datetime",
        "aclitem" => "",
        "any" => "",
        "anyarray" => "",
        "anyelement" => "",
        "anyenum" => "",
        "anynonarray" => "",
        "anyrange" => "",
        "bigint" => "integer",
        "bit" => "",
        "bit varying" => "",
        "boolean" => "boolean",
        "box" => "",
        "bytea" => "string",
        "char" => "string",
        "character" => "string",
        "character varying" => "string",
        "cid" => "",
        "cidr" => "",
        "circle" => "",
        "cstring" => "",
        "date" => "datetime",
        "daterange" => "",
        "decimal" => "float",
        "double precision" => "float",
        "event_trigger" => "",
        "fdw_handler" => "",
        "gtsvector" => "",
        "inet" => "",
        "information_schema.cardinal_number" => "",
        "information_schema.character_data" => "",
        "information_schema.sql_identifier" => "",
        "information_schema.time_stamp" => "",
        "information_schema.yes_or_no" => "",
        "int2vector" => "",
        "int4range" => "",
        "int8range" => "",
        "integer" => "integer",
        "internal" => "",
        "interval" => "",
        "json" => "",
        "jsonb" => "",
        "language_handler" => "",
        "line" => "",
        "lseg" => "",
        "macaddr" => "",
        "money" => "string",
        "name" => "",
        "numeric" => "float",
        "numrange" => "",
        "oid" => "",
        "oidvector" => "",
        "opaque" => "",
        "path" => "",
        "pg_lsn" => "",
        "pg_node_tree" => "",
        "point" => "",
        "polygon" => "",
        "real" => "float",
        "record" => "",
        "refcursor" => "",
        "regclass" => "",
        "regconfig" => "",
        "regdictionary" => "",
        "regoper" => "",
        "regoperator" => "",
        "regproc" => "",
        "regprocedure" => "",
        "regtype" => "",
        "reltime" => "",
        "smallint" => "integer",
        "smallserial" => "integer",
        "smgr" => "",
        "text" => "string",
        "tid" => "",
        "timestamp without time zone" => "datetime",
        "timestamp with time zone" => "datetime",
        "time without time zone" => "datetime",
        "time with time zone" => "datetime",
        "tinterval" => "",
        "trigger" => "",
        "tsquery" => "",
        "tsrange" => "",
        "tstzrange" => "",
        "tsvector" => "",
        "txid_snapshot" => "",
        "unknown" => "",
        "uuid" => "",
        "void" => "",
        "xid" => "",
        "xml" => ""];

    /**
     * @param string $sqlType
     * @return string
     */
    public function sqlTypeToPhpType($sqlType)
    {
        $isArray = false;
        if (LuStringUtils::endsWith($sqlType, "[]")) {
            $isArray = true;
            $sqlType = substr($sqlType, 0, strlen($sqlType) - 2);
        }
        if (!isset(static::$types) || static::$types[$sqlType] == "") {
            return "string";
        }
        return static::$types[$sqlType] . ($isArray ? "[]" : "");
    }

    /**
     * @param \PDO $pdo
     * @return array|null
     */
    public function getTablesFull($pdo)
    {
        $tables_names = $this->getTables($pdo);
        if (is_null($tables_names)) {
            return null;
        }

        $tables = [];
        foreach ($tables_names as $table_name) {
            $columns = $this->getColumns($pdo, $table_name);
            if (is_null($columns)) {
                return null;
            }
            $tables[$table_name] = $columns;
        }

        return $tables;
    }

    /**
     * @param $pdo \PDO
     * @return string[]|null
     */
    public function getTables($pdo)
    {
        $tablesQuery = $pdo->prepare("SELECT table_name AS name
FROM information_schema.tables
WHERE table_type = 'BASE TABLE' AND table_schema NOT IN ('pg_catalog', 'information_schema')");
        if ($tablesQuery->execute(array())) {
            $tables = $tablesQuery->fetchAll();
            $tables = array_map(function($table)
            {
                return $table["name"];
            }, $tables);
            return $tables;
        }
        else
            return null;
    }

    /**
     * @param $pdo \PDO
     * @param $table_name string
     * @return array|null
     */
    public function getColumns($pdo, $table_name)
    {
        $columnsQuery = $pdo->prepare("SELECT column_name as name, data_type as data_type, is_nullable as nullable FROM information_schema.columns WHERE table_name = :table_name");
        if ($columnsQuery->execute(array(":table_name" => $table_name)))
        {
            $columns = $columnsQuery->fetchAll();
            return $columns;
        }
        else
            return null;
    }

    /**
     * @param \PDO $pdo
     * @return array|null
     */
    public function getStoredProceduresFull($pdo)
    {
        $sps = $this->getStoredProcedures($pdo);
        if (is_null($sps)) {
            return null;
        }

        foreach ($sps as $sp_name => $sp) {
            $args = $this->getStoredProceduresArguments($pdo, $sp);
            if (is_null($args)) {
                return null;
            }
            $sps[$sp_name]["args"] = $args;
        }
        return $sps;
    }

    /**
     * @param $pdo \PDO
     * @return array|null
     */
    public function getStoredProcedures($pdo)
    {
        $spQuery = $pdo->prepare("SELECT r.routine_name AS sp_name, r.data_type AS data_type, proc.proretset AS proretset, proc.prosrc AS prosrc
FROM information_schema.routines r
LEFT JOIN pg_catalog.pg_proc proc ON proc.proname = r.routine_name
WHERE r.specific_schema='public'");
        if ($spQuery->execute())
        {
            $sps = $spQuery->fetchAll();
            $data = [];
            foreach ($sps as $sp) {
                $data[$sp["sp_name"]] = ["sp" => $sp];
            }
            return $data;
        }
        else
            return null;
    }

    /**
     * @param $pdo \PDO
     * @param $sp string
     * @return array|null
     */
    public function getStoredProceduresArguments($pdo, $sp)
    {
        $sp_name = $sp["sp"]["sp_name"];
        $spQuery = $pdo->prepare("SELECT parameters.parameter_name as name, parameters.data_type, parameters.parameter_mode
FROM information_schema.routines
JOIN information_schema.parameters ON routines.specific_name=parameters.specific_name
WHERE routines.specific_schema='public' AND routines.routine_name = :sp_name
ORDER BY parameters.ordinal_position;");
        if ($spQuery->execute(array("sp_name" => $sp_name)))
        {
            $sp_ = $spQuery->fetchAll();
            $sps = array("in" => array(), "out" => array());
            foreach ($sp_ as $p)
                $sps[strtolower($p["parameter_mode"])][] = $p;
            $out_count = count($sps['out']);
            if ($out_count == 0)
            {
                $sps['out'][] = array(
                    "name" => $sp_name,
                    "data_type" => $sp["data_type"],
                    "parameter_mode" => "OUT"
                );
                $out_count = 1;
            }
            return $sps;
        }
        else
            return null;
    }
}