export function parseSVG(input: string): Command[];

// This function modifies the `commands` in place and returns it.
// In TypeScript, the only way to modify the argument's type is to write
// `function f(cs: Command[]): asserts cs is CommandMadeAbsolute[];`, but then this makes the function return void.
// Hence, the only solution possible is to exploit the fact that this function returns the modified argument
// and make the return value be of type `CommandMadeAbsolute[]` and the argument to remain in `Command[]`.
export function makeAbsolute(commands: Command[]): CommandMadeAbsolute[];

export type CommandMadeAbsolute =
    | MoveToCommandMadeAbsolute
    | LineToCommandMadeAbsolute
    | HorizontalLineToCommandMadeAbsolute
    | VerticalLineToCommandMadeAbsolute
    | ClosePathCommandMadeAbsolute
    | CurveToCommandMadeAbsolute
    | SmoothCurveToCommandMadeAbsolute
    | QuadraticCurveToCommandMadeAbsolute
    | SmoothQuadraticCurveToCommandMadeAbsolute
    | EllipticalArcCommandMadeAbsolute;

export type Command =
    | MoveToCommand
    | LineToCommand
    | HorizontalLineToCommand
    | VerticalLineToCommand
    | ClosePathCommand
    | CurveToCommand
    | SmoothCurveToCommand
    | QuadraticCurveToCommand
    | SmoothQuadraticCurveToCommand
    | EllipticalArcCommand;

export interface BaseCommand {
    code:
        | "m"
        | "M"
        | "l"
        | "L"
        | "h"
        | "H"
        | "v"
        | "V"
        | "c"
        | "C"
        | "s"
        | "S"
        | "q"
        | "Q"
        | "t"
        | "T"
        | "a"
        | "A"
        | "z"
        | "Z";
    command:
        | "moveto"
        | "lineto"
        | "horizontal lineto"
        | "vertical lineto"
        | "curveto"
        | "smooth curveto"
        | "quadratic curveto"
        | "smooth quadratic curveto"
        | "elliptical arc"
        | "closepath";
    relative?: boolean | undefined;
}

export interface MoveToCommand extends BaseCommand {
    code: "m" | "M";
    command: "moveto";
    relative?: boolean | undefined;
    x: number;
    y: number;
}

export interface LineToCommand extends BaseCommand {
    code: "l" | "L";
    command: "lineto";
    relative?: boolean | undefined;
    x: number;
    y: number;
}

export interface HorizontalLineToCommand extends BaseCommand {
    code: "h" | "H";
    command: "horizontal lineto";
    relative?: boolean | undefined;
    x: number;
}

export interface VerticalLineToCommand extends BaseCommand {
    code: "v" | "V";
    command: "vertical lineto";
    relative?: boolean | undefined;
    y: number;
}

export interface ClosePathCommand extends BaseCommand {
    code: "z" | "Z";
    command: "closepath";
    relative?: boolean | undefined;
}

export interface CurveToCommand extends BaseCommand {
    code: "c" | "C";
    command: "curveto";
    relative?: boolean | undefined;
    x1: number;
    y1: number;
    x2: number;
    y2: number;
    x: number;
    y: number;
}

export interface SmoothCurveToCommand extends BaseCommand {
    code: "s" | "S";
    command: "smooth curveto";
    relative?: boolean | undefined;
    x2: number;
    y2: number;
    x: number;
    y: number;
}

export interface QuadraticCurveToCommand extends BaseCommand {
    code: "q" | "Q";
    command: "quadratic curveto";
    relative?: boolean | undefined;
    x1: number;
    y1: number;
    x: number;
    y: number;
}

export interface SmoothQuadraticCurveToCommand extends BaseCommand {
    code: "t" | "T";
    command: "smooth quadratic curveto";
    relative?: boolean | undefined;
    x: number;
    y: number;
}

export interface EllipticalArcCommand extends BaseCommand {
    code: "a" | "A";
    command: "elliptical arc";
    relative?: boolean | undefined;
    rx: number;
    ry: number;
    xAxisRotation: number;
    largeArc: boolean;
    sweep: boolean;
    x: number;
    y: number;
}

export interface MoveToCommandMadeAbsolute extends BaseCommand {
    code: "M";
    command: "moveto";
    relative: false;
    x: number;
    y: number;
    x0: number;
    y0: number;
}

export interface LineToCommandMadeAbsolute extends BaseCommand {
    code: "L";
    command: "lineto";
    relative: false;
    x: number;
    y: number;
    x0: number;
    y0: number;
}

export interface HorizontalLineToCommandMadeAbsolute extends BaseCommand {
    code: "H";
    command: "horizontal lineto";
    relative: false;
    x: number;
    y: number;
    x0: number;
    y0: number;
}

export interface VerticalLineToCommandMadeAbsolute extends BaseCommand {
    code: "V";
    command: "vertical lineto";
    relative: false;
    x: number;
    y: number;
    x0: number;
    y0: number;
}

export interface ClosePathCommandMadeAbsolute extends BaseCommand {
    code: "Z";
    command: "closepath";
    relative: false;
    x: number;
    y: number;
    x0: number;
    y0: number;
}

export interface CurveToCommandMadeAbsolute extends BaseCommand {
    code: "C";
    command: "curveto";
    relative: false;
    x1: number;
    y1: number;
    x2: number;
    y2: number;
    x: number;
    y: number;
    x0: number;
    y0: number;
}

export interface SmoothCurveToCommandMadeAbsolute extends BaseCommand {
    code: "S";
    command: "smooth curveto";
    relative: false;
    x2: number;
    y2: number;
    x: number;
    y: number;
    x0: number;
    y0: number;
}

export interface QuadraticCurveToCommandMadeAbsolute extends BaseCommand {
    code: "Q";
    command: "quadratic curveto";
    relative: false;
    x1: number;
    y1: number;
    x: number;
    y: number;
    x0: number;
    y0: number;
}

export interface SmoothQuadraticCurveToCommandMadeAbsolute extends BaseCommand {
    code: "T";
    command: "smooth quadratic curveto";
    relative: false;
    x: number;
    y: number;
    x0: number;
    y0: number;
}

export interface EllipticalArcCommandMadeAbsolute extends BaseCommand {
    code: "A";
    command: "elliptical arc";
    relative: false;
    rx: number;
    ry: number;
    xAxisRotation: number;
    largeArc: boolean;
    sweep: boolean;
    x: number;
    y: number;
    x0: number;
    y0: number;
}