import { literalDefs, Type } from ".";

export type ExprBase = {
	id: string;
};

// value

export type EmptyValue = ExprBase & {
	type: null;
	value: null;
};

export type TextValue = ExprBase & {
	type: "text";
	value: string;
};

export type MultiLineTextValue = ExprBase & {
	type: "multiLineText";
	value: string;
};

export type TextListValue = ExprBase & {
	type: "textList";
	value: string;
};

export type NumberValue = ExprBase & {
	type: "number";
	value: number;
};

export type RefValue = ExprBase & {
	type: "ref";
	value: string; // value is variable name
};

export type AiScriptRefValue = ExprBase & {
	type: "aiScriptVar";
	value: string; // value is variable name
};

export type UserFnValue = ExprBase & {
	type: "fn";
	value: UserFnInnerValue;
};
type UserFnInnerValue = {
	slots: {
		name: string;
		type: Type;
	}[];
	expression: Expr;
};

export type Value =
	| EmptyValue
	| TextValue
	| MultiLineTextValue
	| TextListValue
	| NumberValue
	| RefValue
	| AiScriptRefValue
	| UserFnValue;

export function isLiteralValue(expr: Expr): expr is Value {
	if (expr.type == null) return true;
	if (literalDefs[expr.type]) return true;
	return false;
}

// call function

export type CallFn = ExprBase & {
	// "fn:hoge" or string
	type: string;
	args: Expr[];
	value: null;
};

// variable
export type Variable = (Value | CallFn) & {
	name: string;
};

// expression
export type Expr = Variable | Value | CallFn;
