// SiYuan - Refactor your thinking
// Copyright (c) 2020-present, b3log.org
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.

package av

// Calculable 接口定义了可计算的视图类型。
type Calculable interface {

	// Calc 根据视图中设置的计算规则进行计算。
	Calc()
}

// ColumnCalc 描述了列（字段）计算操作和结果的结构。
type ColumnCalc struct {
	Operator CalcOperator `json:"operator"` // 计算操作符
	Result   *Value       `json:"result"`   // 计算结果
}

type CalcOperator string

const (
	CalcOperatorNone                CalcOperator = ""
	CalcOperatorCountAll            CalcOperator = "Count all"
	CalcOperatorCountValues         CalcOperator = "Count values"
	CalcOperatorCountUniqueValues   CalcOperator = "Count unique values"
	CalcOperatorCountEmpty          CalcOperator = "Count empty"
	CalcOperatorCountNotEmpty       CalcOperator = "Count not empty"
	CalcOperatorPercentEmpty        CalcOperator = "Percent empty"
	CalcOperatorPercentNotEmpty     CalcOperator = "Percent not empty"
	CalcOperatorPercentUniqueValues CalcOperator = "Percent unique values"
	CalcOperatorSum                 CalcOperator = "Sum"
	CalcOperatorAverage             CalcOperator = "Average"
	CalcOperatorMedian              CalcOperator = "Median"
	CalcOperatorMin                 CalcOperator = "Min"
	CalcOperatorMax                 CalcOperator = "Max"
	CalcOperatorRange               CalcOperator = "Range"
	CalcOperatorEarliest            CalcOperator = "Earliest"
	CalcOperatorLatest              CalcOperator = "Latest"
	CalcOperatorChecked             CalcOperator = "Checked"
	CalcOperatorUnchecked           CalcOperator = "Unchecked"
	CalcOperatorPercentChecked      CalcOperator = "Percent checked"
	CalcOperatorPercentUnchecked    CalcOperator = "Percent unchecked"
)