#include "duckdb/execution/operator/aggregate/aggregate_object.hpp"
#include "duckdb/planner/expression/bound_aggregate_expression.hpp"

namespace duckdb {

AggregateObject::AggregateObject(AggregateFunction function, FunctionData *bind_data, idx_t child_count,
                                 idx_t payload_size, AggregateType aggr_type, PhysicalType return_type,
                                 Expression *filter)
    : function(move(function)), bind_data(bind_data), child_count(child_count), payload_size(payload_size),
      aggr_type(aggr_type), return_type(return_type), filter(filter) {
}

AggregateObject::AggregateObject(BoundAggregateExpression *aggr)
    : AggregateObject(aggr->function, aggr->bind_info.get(), aggr->children.size(),
                      AlignValue(aggr->function.state_size()), aggr->aggr_type, aggr->return_type.InternalType(),
                      aggr->filter.get()) {
}

vector<AggregateObject> AggregateObject::CreateAggregateObjects(const vector<BoundAggregateExpression *> &bindings) {
	vector<AggregateObject> aggregates;
	aggregates.reserve(aggregates.size());
	for (auto &binding : bindings) {
		aggregates.emplace_back(binding);
	}
	return aggregates;
}

AggregateFilterData::AggregateFilterData(ClientContext &context, Expression &filter_expr,
                                         const vector<LogicalType> &payload_types)
    : filter_executor(context, &filter_expr), true_sel(STANDARD_VECTOR_SIZE) {
	if (payload_types.empty()) {
		return;
	}
	filtered_payload.Initialize(Allocator::Get(context), payload_types);
}

idx_t AggregateFilterData::ApplyFilter(DataChunk &payload) {
	filtered_payload.Reset();

	auto count = filter_executor.SelectExpression(payload, true_sel);
	filtered_payload.Slice(payload, true_sel, count);
	return count;
}

AggregateFilterDataSet::AggregateFilterDataSet() {
}

void AggregateFilterDataSet::Initialize(ClientContext &context, const vector<AggregateObject> &aggregates,
                                        const vector<LogicalType> &payload_types) {
	bool has_filters = false;
	for (auto &aggregate : aggregates) {
		if (aggregate.filter) {
			has_filters = true;
			break;
		}
	}
	if (!has_filters) {
		// no filters: nothing to do
		return;
	}
	filter_data.resize(aggregates.size());
	for (idx_t aggr_idx = 0; aggr_idx < aggregates.size(); aggr_idx++) {
		auto &aggr = aggregates[aggr_idx];
		if (aggr.filter) {
			filter_data[aggr_idx] = make_unique<AggregateFilterData>(context, *aggr.filter, payload_types);
		}
	}
}

AggregateFilterData &AggregateFilterDataSet::GetFilterData(idx_t aggr_idx) {
	D_ASSERT(aggr_idx < filter_data.size());
	D_ASSERT(filter_data[aggr_idx]);
	return *filter_data[aggr_idx];
}
} // namespace duckdb
