import RoleSelection from "./RoleSelection";
import TokensSelection from "./TokensSelection";
import Frame from "../../data/Frame";
import DragingSelection from "./DragingSelection";

type Selection = null|TokensSelection|RoleSelection|DragingSelection;
function isTokenSelected(selection:Selection, tokenIndex:number, frames:Frame[]):boolean {
    if(selection instanceof TokensSelection) {
        return selection.beginIndex<=tokenIndex && tokenIndex<selection.endIndex;
    }
    else if(selection instanceof RoleSelection) {
        if(frames.length<=selection.frameIndex) return false;
        if( frames[selection.frameIndex].roles.length<=selection.roleIndex) return false;
        const role = frames[selection.frameIndex].roles[selection.roleIndex];
        return role.beginTokenIndex<=tokenIndex && tokenIndex<role.beginTokenIndex+role.length;
    }
    else if(selection instanceof DragingSelection) {
        if(selection.anchor1 <= selection.anchor2) {
            return selection.anchor1<= tokenIndex && tokenIndex <= selection.anchor2;
        }
        else {
            return selection.anchor2<= tokenIndex && tokenIndex <= selection.anchor1;
        }
    }
    return false;
}
function isRoleSelected(selection:Selection, frameIndex:number, roleIndex:number):boolean {
    if(selection instanceof RoleSelection) {
        return selection.frameIndex === frameIndex && selection.roleIndex === roleIndex;
    }
    return false;
}
export {isTokenSelected, isRoleSelected};