#include <AggregateFunctions/AggregateFunctionFactory.h>
#include <AggregateFunctions/AggregateFunctionWindowFunnel.h>
#include <AggregateFunctions/FactoryHelpers.h>
#include <AggregateFunctions/Helpers.h>
#include <Core/Settings.h>
#include <DataTypes/DataTypeDate.h>
#include <DataTypes/DataTypeDate32.h>
#include <DataTypes/DataTypeDateTime.h>

#include <base/range.h>


namespace DB
{
struct Settings;

namespace ErrorCodes
{
    extern const int ILLEGAL_TYPE_OF_ARGUMENT;
    extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
}

namespace
{

template <template <typename> class Data>
AggregateFunctionPtr
createAggregateFunctionWindowFunnel(const std::string & name, const DataTypes & arguments, const Array & params, const Settings *)
{
    if (params.empty())
        throw Exception(ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH,
                        "Aggregate function {} requires at least one parameter: <window>, [option, [option, ...]]",
                        name);

    if (arguments.size() < 2)
        throw Exception(ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH,
                        "Aggregate function {} requires one timestamp argument and at least one event condition.", name);

    if (arguments.size() > max_events + 1)
        throw Exception(ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH, "Too many event arguments for aggregate function {}", name);

    for (const auto i : collections::range(1, arguments.size()))
    {
        const auto * cond_arg = arguments[i].get();
        if (!isUInt8(cond_arg))
            throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT,
                            "Illegal type {} of argument {} of aggregate function {}, must be UInt8",
                            cond_arg->getName(), toString(i + 1), name);
    }

    AggregateFunctionPtr res(createWithUnsignedIntegerType<AggregateFunctionWindowFunnel, Data>(*arguments[0], arguments, params));
    WhichDataType which(arguments.front().get());
    if (res)
        return res;
    else if (which.isDate())
        return std::make_shared<AggregateFunctionWindowFunnel<DataTypeDate::FieldType, Data<DataTypeDate::FieldType>>>(arguments, params);
    else if (which.isDateTime())
        return std::make_shared<AggregateFunctionWindowFunnel<DataTypeDateTime::FieldType, Data<DataTypeDateTime::FieldType>>>(arguments, params);

    throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT,
                    "Illegal type {} of first argument of aggregate function {}, must "
                    "be Unsigned Number, Date, DateTime", arguments.front().get()->getName(), name);
}

}

void registerAggregateFunctionWindowFunnel(AggregateFunctionFactory & factory)
{
    factory.registerFunction("windowFunnel", createAggregateFunctionWindowFunnel<AggregateFunctionWindowFunnelData>);
}

}