import { Position } from "./token.ts";

export type UnaryType =
    | "negate"
    | "log_not"
    | "bit_not"
    | "addressof"
    | "dereference";

export type BinaryType =
    | "add"
    | "subtract"
    | "log_and"
    | "log_or"
    | "bit_and"
    | "bit_or"
    | "bit_xor"
    | "equal"
    | "inequal"
    | "lt"
    | "gt"
    | "ltequal"
    | "gtequal";

export type AssignType =
    | "equal"
    | "add"
    | "subtract"
    | "and"
    | "or"
    | "xor";

export type ParsedExpr =
    & {
        pos: Position;
    }
    & ({ exprType: "error"; message: string } | {
        exprType: "unit";
    } | {
        exprType: "id";
        value: string;
    } | {
        exprType: "int";
        value: number;
    } | {
        exprType: "if";
        condition: ParsedExpr;
        truthy: ParsedExpr;
        falsy: ParsedExpr | null;
    } | {
        exprType: "block";
        body: ParsedExpr[];
        value: ParsedExpr | null;
    } | {
        exprType: "call";
        subject: ParsedExpr;
        args: ParsedExpr[];
    } | {
        exprType: "index";
        subject: ParsedExpr;
        value: ParsedExpr;
    } | {
        exprType: "increment" | "decrement";
        subject: ParsedExpr;
    } | {
        exprType: "unary";
        unaryType: UnaryType;
        subject: ParsedExpr;
    } | {
        exprType: "binary";
        binaryType: BinaryType;
        left: ParsedExpr;
        right: ParsedExpr;
    } | {
        exprType: "assign";
        assignType: AssignType;
        subject: ParsedExpr;
        value: ParsedExpr;
    } | {
        exprType: "let";
        param: ParsedParameter;
        value: ParsedExpr;
    } | {
        exprType: "fn";
        subject: string;
        params: ParsedParameter[];
        returnType: ParsedType | null;
        body: ParsedExpr;
    } | {
        exprType: "return";
        value: ParsedExpr | null;
    } | {
        exprType: "loop";
        body: ParsedExpr;
    } | {
        exprType: "while";
        condition: ParsedExpr;
        body: ParsedExpr;
    } | {
        exprType: "break";
    } | {
        exprType: "continue";
    });

export type ParsedParameter =
    & {
        pos: Position;
    }
    & ({ paramType: "error"; message: string } | {
        paramType: "value";
        subject: string;
        valueType: ParsedType | null;
        mutable: boolean;
    });

export type ParsedType =
    & { pos: Position }
    & ({ typeType: "error"; message: string } | {
        typeType: "unit";
    } | {
        typeType: "id";
        value: string;
    } | {
        typeType: "pointer";
        subject: ParsedType;
        mutable: boolean;
    });