#include "cmdline.h"
#include "printdata.h"

#include <mysql++.h>

#include <algorithm>
#include <iostream>
#include <iomanip>
#include <vector>

using namespace std;
using namespace mysqlpp;


typedef vector<size_t> IntVectorType;


static void
print_header(IntVectorType& widths, StoreQueryResult& res)
{
    cout << "  |" << setfill(' ');
    for (size_t i = 0; i < res.field_names()->size(); i++) {
        cout << " " << setw(widths.at(i)) << res.field_name(int(i)) << " |";
    }
    cout << endl;
}


static void
print_row(IntVectorType& widths, Row& row)
{
    cout << "  |" << setfill(' ');
    for (size_t i = 0; i < row.size(); ++i) {
        cout << " " << setw(widths.at(i)) << row[int(i)] << " |";
    }
    cout << endl;
}


static void
print_row_separator(IntVectorType& widths)
{
    cout << "  +" << setfill('-');
    for (size_t i = 0; i < widths.size(); i++) {
        cout << "-" << setw(widths.at(i)) << '-' << "-+";
    }
    cout << endl;
}


static void
print_result(StoreQueryResult& res, int index)
{
    // Show how many rows are in result, if any
    StoreQueryResult::size_type num_results = res.size();
    if (res && (num_results > 0)) {
        cout << "Result set " << index << " has " << num_results <<
                " row" << (num_results == 1 ? "" : "s") << ':' << endl;
    }
    else {
        cout << "Result set " << index << " is empty." << endl;
        return;
    }

    // Figure out the widths of the result set's columns
    IntVectorType widths;
    size_t size = res.num_fields();
    for (size_t i = 0; i < size; i++) {
        widths.push_back(max(
                res.field(i).max_length(),
                res.field_name(i).size()));
    }

    // Print result set header
    print_row_separator(widths);
    print_header(widths, res);
    print_row_separator(widths);

    // Display the result set contents
    for (StoreQueryResult::size_type i = 0; i < num_results; ++i) {
        print_row(widths, res[i]);
    }

    // Print result set footer
    print_row_separator(widths);
}


static void
print_multiple_results(Query& query)
{
    // Execute query and print all result sets
    StoreQueryResult res = query.store();
    print_result(res, 0);
    for (int i = 1; query.more_results(); ++i) {
        res = query.store_next();
        print_result(res, i);
    }
}


int
main(int argc, char *argv[])
{
    // Get connection parameters from command line
    mysqlpp::examples::CommandLine cmdline(argc, argv);
    if (!cmdline) {
        return 1;
    }

    try {
        // Enable multi-queries.  Notice that you almost always set
        // MySQL++ connection options before establishing the server
        // connection, and options are always set using this one
        // interface.  If you're familiar with the underlying C API,
        // you know that there is poor consistency on these matters;
        // MySQL++ abstracts these differences away.
        Connection con;
        con.set_option(new MultiStatementsOption(true));

        // Connect to the database
        if (!con.connect(mysqlpp::examples::db_name, cmdline.server(),
                cmdline.user(), cmdline.pass())) {
            return 1;
        }

        // Set up query with multiple queries.
        Query query = con.query();
        query << "DROP TABLE IF EXISTS test_table; " <<
                "CREATE TABLE test_table(id INT); " <<
                "INSERT INTO test_table VALUES(10); " <<
                "UPDATE test_table SET id=20 WHERE id=10; " <<
                "SELECT * FROM test_table; " <<
                "DROP TABLE test_table";
        cout << "Multi-query: " << endl << query << endl;

        // Execute statement and display all result sets.
        print_multiple_results(query);

#if MYSQL_VERSION_ID >= 50000
        // If it's MySQL v5.0 or higher, also test stored procedures, which
        // return their results the same way multi-queries do.
        query << "DROP PROCEDURE IF EXISTS get_stock; " <<
                "CREATE PROCEDURE get_stock" <<
                "( i_item varchar(20) ) " <<
                "BEGIN " <<
                "SET i_item = concat('%', i_item, '%'); " <<
                "SELECT * FROM stock WHERE lower(item) like lower(i_item); " <<
                "END;";
        cout << "Stored procedure query: " << endl << query << endl;

        // Create the stored procedure.
        print_multiple_results(query);

        // Call the stored procedure and display its results.
        query << "CALL get_stock('relish')";
        cout << "Query: " << query << endl;
        print_multiple_results(query);
#endif

        return 0;
    }
    catch (const BadOption& err) {
        cerr << err.what() << endl;
        cerr << "This example requires MySQL 4.1.1 or later." << endl;
        return 1;
    }
    catch (const ConnectionFailed& err) {
        cerr << "Failed to connect to database server: " <<
                err.what() << endl;
        return 1;
    }
    catch (const Exception& er) {
        // Catch-all for any other MySQL++ exceptions
        cerr << "Error: " << er.what() << endl;
        return 1;
    }
}
