/** 样式单位 */
export enum StyleUnitEnum {
    percentage = '%',
    px = 'px',
    em = 'em',
    rem = 'rem',
    vw = 'vw',
    vh = 'vh',
    vmax = 'vmax',
    vmin = 'vmin',
}

/** 样式属性通用值 */
export enum StyleBaseValueEnum {
    inherit = 'inherit',
    initial = 'initial',
    unset = 'unset'
}

export enum TypeEnum {
    ID = 'ID',
    Number = 'NUMBER',
    Percentage = 'PERCENTAGE',
    String = 'STRING',
    Dimension = 'DIMENSION',
    Hash = 'HASH',
    Url = 'URL',
    Sequence = 'SEQUENCE',
    Expression = 'EXPRESSION',
    Function = 'FUNCTION',
    Declaration = 'DECLARATION'
}

export interface PrimitiveVal<T = string, V = any> {
    type: T,
    value: V;
}

export interface UnitVal extends PrimitiveVal<string, number> {
    unit: string;
}

export interface IdentVal extends PrimitiveVal<TypeEnum.ID, string> {
    type: TypeEnum.ID;
    value: string;
    vendorPrefix?: string;
}

export type NumberValue = PrimitiveVal<TypeEnum.Number, number>;

export interface PercentageVal extends PrimitiveVal<TypeEnum.Percentage, number> {
    unit: StyleUnitEnum.percentage;
}

export type StringValue = PrimitiveVal<TypeEnum.String, string>;

export interface DimensionValue extends PrimitiveVal<TypeEnum.Dimension, number> {
    unit: string
}

export type HashValue = PrimitiveVal<TypeEnum.Hash, string>;

export interface UrlValue extends PrimitiveVal<TypeEnum.Url, string> {
    name: IdentVal;
}

export type SequenceValue = PrimitiveVal<TypeEnum.Sequence, DeclarationValue[]>;

export interface Expression {
    type: TypeEnum.Expression,
    operator: string;
    lhs: NumberValue | PercentageVal | DimensionValue;
    rhs: NumberValue | PercentageVal | DimensionValue;
}

export interface FunctionValue extends PrimitiveVal<TypeEnum.Function, undefined> {
    name: string | IdentVal;
    parameters: DeclarationValue;
}

export type DeclarationValue = IdentVal | NumberValue | PercentageVal | StringValue | DimensionValue | UrlValue | FunctionValue | SequenceValue;

export interface Declaration {
    type: TypeEnum.Declaration,
    property: PrimitiveVal<TypeEnum.ID, string>,
    value: DeclarationValue
}