#include <algorithm>
#include <regex>

#include <xlnt/common/hash_combine.hpp>
#include <xlnt/styles/number_format.hpp>

namespace {

const std::unordered_map<int, std::string> &builtin_formats()
{
    static const std::unordered_map<int, std::string> formats =
    {
        {0, "General"},
        {1, "0"},
        {2, "0.00"},
        {3, "#,##0"},
        {4, "#,##0.00"},
        {5, "\"$\"#,##0_);(\"$\"#,##0)"},
        {6, "\"$\"#,##0_);[Red](\"$\"#,##0)"},
        {7, "\"$\"#,##0.00_);(\"$\"#,##0.00)"},
        {8, "\"$\"#,##0.00_);[Red](\"$\"#,##0.00)"},
        {9, "0%"},
        {10, "0.00%"},
        {11, "0.00E+00"},
        {12, "# ?/?"},
        {13, "# \?\?/??"}, //escape trigraph
        {14, "mm-dd-yy"},
        {15, "d-mmm-yy"},
        {16, "d-mmm"},
        {17, "mmm-yy"},
        {18, "h:mm AM/PM"},
        {19, "h:mm:ss AM/PM"},
        {20, "h:mm"},
        {21, "h:mm:ss"},
        {22, "m/d/yy h:mm"},
        
        {37, "#,##0_);(#,##0)"},
        {38, "#,##0_);[Red](#,##0)"},
        {39, "#,##0.00_);(#,##0.00)"},
        {40, "#,##0.00_);[Red](#,##0.00)"},
        
        {41, "_(* #,##0_);_(* \\(#,##0\\);_(* \"-\"_);_(@_)"},
        {42, "_(\"$\"* #,##0_);_(\"$\"* \\(#,##0\\);_(\"$\"* \"-\"_);_(@_)"},
        {43, "_(* #,##0.00_);_(* \\(#,##0.00\\);_(* \"-\"??_);_(@_)"},
        
        {44, "_(\"$\"* #,##0.00_)_(\"$\"* \\(#,##0.00\\)_(\"$\"* \"-\"??_)_(@_)"},
        {45, "mm:ss"},
        {46, "[h]:mm:ss"},
        {47, "mmss.0"},
        {48, "##0.0E+0"},
        {49, "@"}
        
        //EXCEL differs from the standard in the following:
        //{14, "m/d/yyyy"},
        //{22, "m/d/yyyy h:mm"},
        //{37, "#,##0_);(#,##0)"},
        //{38, "#,##0_);[Red]"},
        //{39, "#,##0.00_);(#,##0.00)"},
        //{40, "#,##0.00_);[Red]"},
        //{47, "mm:ss.0"},
        //{55, "yyyy/mm/dd"}
    };
    
    return formats;
}
    
} // namespace

namespace xlnt {

const number_format number_format::general()
{
    static const number_format format(builtin_formats().at(0), 0);
    return format;
}
    
const number_format number_format::text()
{
    static const number_format format(builtin_formats().at(49), 49);
    return format;
}
    
const number_format number_format::number()
{
    static const number_format format(builtin_formats().at(1), 1);
    return format;
}
    
const number_format number_format::number_00()
{
    static const number_format format(builtin_formats().at(2), 2);
    return format;
}
    
const number_format number_format::number_comma_separated1()
{
    static const number_format format(builtin_formats().at(4), 4);
    return format;
}
    
const number_format number_format::number_comma_separated2()
{
    static const number_format format("#,##0.00_-");
    return format;
}
    
const number_format number_format::percentage()
{
    static const number_format format(builtin_formats().at(9), 9);
    return format;
}
    
const number_format number_format::percentage_00()
{
    static const number_format format(builtin_formats().at(10), 10);
    return format;
}
    
const number_format number_format::date_yyyymmdd2()
{
    static const number_format format("yyyy-mm-dd");
    return format;
}
    
const number_format number_format::date_yyyymmdd()
{
    static const number_format format("yy-mm-dd");
    return format;
}
    
const number_format number_format::date_ddmmyyyy()
{
    static const number_format format("dd/mm/yy");
    return format;
}
    
const number_format number_format::date_dmyslash()
{
    static const number_format format("d/m/y");
    return format;
}
    
const number_format number_format::date_dmyminus()
{
    static const number_format format("d-m-y");
    return format;
}
    
const number_format number_format::date_dmminus()
{
    static const number_format format("d-m");
    return format;
}
    
const number_format number_format::date_myminus()
{
    static const number_format format("m-y");
    return format;
}
    
const number_format number_format::date_xlsx14()
{
    static const number_format format(builtin_formats().at(14), 14);
    return format;
}
    
const number_format number_format::date_xlsx15()
{
    static const number_format format(builtin_formats().at(15), 15);
    return format;
}
    
const number_format number_format::date_xlsx16()
{
    static const number_format format(builtin_formats().at(16), 16);
    return format;
}
    
const number_format number_format::date_xlsx17()
{
    static const number_format format(builtin_formats().at(17), 17);
    return format;
}
    
const number_format number_format::date_xlsx22()
{
    static const number_format format(builtin_formats().at(22), 22);
    return format;
}
    
const number_format number_format::date_datetime()
{
    static const number_format format("yyyy-mm-dd h:mm:ss");
    return format;
}
    
const number_format number_format::date_time1()
{
    static const number_format format(builtin_formats().at(18), 18);
    return format;
}
    
const number_format number_format::date_time2()
{
    static const number_format format(builtin_formats().at(19), 19);
    return format;
}
    
const number_format number_format::date_time3()
{
    static const number_format format(builtin_formats().at(20), 20);
    return format;
}
    
const number_format number_format::date_time4()
{
    static const number_format format(builtin_formats().at(21), 21);
    return format;
}
    
const number_format number_format::date_time5()
{
    static const number_format format(builtin_formats().at(45), 45);
    return format;
}
    
const number_format number_format::date_time6()
{
    static const number_format format(builtin_formats().at(21), 21);
    return format;
}
    
const number_format number_format::date_time7()
{
    static const number_format format("i:s.S");
    return format;
}
    
const number_format number_format::date_time8()
{
    static const number_format format("h:mm:ss@");
    return format;
}
    
const number_format number_format::date_timedelta()
{
    static const number_format format("[hh]:mm:ss");
    return format;
}
    
const number_format number_format::date_yyyymmddslash()
{
    static const number_format format("yy/mm/dd@");
    return format;
}
    
const number_format number_format::currency_usd_simple()
{
    static const number_format format("\"$\"#,##0.00_-");
    return format;
}
    
const number_format number_format::currency_usd()
{
    static const number_format format("$#,##0_-");
    return format;
}
    
const number_format number_format::currency_eur_simple()
{
    static const number_format format("[$EUR ]#,##0.00_-");
    return format;
}

number_format::number_format() : number_format(general())
{
}

number_format::number_format(int id) : number_format(from_builtin_id(id))
{
}

number_format::number_format(const std::string &format_string, int id)
{
    set_format_string(format_string, id);
}

number_format number_format::from_builtin_id(int builtin_id)
{
    if(builtin_formats().find(builtin_id) == builtin_formats().end())
    {
        throw std::runtime_error("unknown id: " + std::to_string(builtin_id));
    }
    
    auto format_string = builtin_formats().at(builtin_id);
    return number_format(format_string, builtin_id);
}

std::string number_format::get_format_string() const
{
    return format_string_;
}

std::size_t number_format::hash() const
{
    std::size_t seed = static_cast<std::size_t>(id_);
    hash_combine(seed, format_string_);
    
    return seed;
}
    
void number_format::set_format_string(const std::string &format_string, int id)
{
    format_string_ = format_string;
    id_ = id;
    
    if(id_ == -1)
    {
        for(const auto &pair : builtin_formats())
        {
            if(pair.second == format_string)
            {
                id_ = pair.first;
                break;
            }
        }
    }
}

} // namespace xlnt