interface FlagT<T, Z> {
    default?: T,
    aliases?: string[],
    /** Shorhands, AKA only work with singular minus signs like -f; Multiple characters are allowed; Will not count as a full (like --f) flag alias; */
    shorthands?: string|string[],
    type?: Z
    /** Whether to send/throw an error if the flag is present but no value is set, either with an assigned (--flag=value) value, or regular --flag value @default false */
    requiredValue?: boolean
};

export type FlagAny = FlagT<string, "string"> | FlagT<boolean, "boolean"> | FlagT<number, "number"> | FlagT<bigint, "bigint"> | FlagT<string | number | bigint | boolean, "any">

export interface FlagsI { [key: readonly string]: FlagAny }

export type DefaultParserOptsType = ParserOpts<FlagsI>

/** This object will be modified by parser */
export interface ParserOpts<Flags extends FlagsI> {
    flags?: Flags, 
    /** Wether to allow versions of `-flag` as a singular and valid flag. @default false */
    allowSingularDashLongFlags?: boolean = false 
    /** Wether to allow flags not denoted in the flag property. @default true */
    allowUnknownFlags?: boolean = true
    /** Wether to lowercase all flags key. Incompatible with camelCaseFlags option. @default true */
    lowerCaseFlags?: boolean = true
    /** Wether to automatically resolve flag number values into numbers and boolean flags into booleans if flag type is explicitly set. @default true */
    resolveFlagValueTypes?: boolean = true
    /**
     * Setting according flag to the inversed provided boolean value (defaulting to false if none is provided) with their '--no' variants unless a defined flag exists with that
     * name already; Additional informations in sub-properties.
     * @default 
     * ```js
     *  = { enabled: true, allowUnspacedNegatedFlags: true, shorthandNegation: true }
     * ```
     */
   automaticBooleanFlagNegation?: {
       /** Wether to automatically resolve boolean flags that are negated to the inverse boolean value. Requires resolveFlagValueTypes. @default true */
       enabled?: boolean;
       /** Allows flags negated without a space (eg: "--noflag") to still be automatically resolved @default true */
       allowUnspacedNegatedFlags?: boolean;
       /** Wether to negate shorthand flags with if an n is present before hand (eg: '-nf'). Providing a shorthand of 'n' will disable this feature. @default true */
       shorthandNegation?: boolean;
    }
    /** Enable this option to silence any warnings about potentially unexpected behavior (eg: a flag's unset type being set to the default). @default false */
    silenceWarnings?: boolean;
    /** Override to change how warnings are emitted @default console.warn */
    warningLogger?: (log: string) => void;
    /** Default type for either unknown flags or flags without an explicit type being set @default "any" */
    defaultFlagType?: "string" | "boolean" | "bigint" | "number" | "any";
    /** 
     * Behavior when input does not follow the provided flags constraints (eg: flag assigned value (--flag=value) not being the correct type). 
     * 
     * Setting it to 'ignore' or 'log' is highly not recommended and will lead to undefined behavior. (eg: flags not meeting the configuration not being present 
     * in the final returned object)
     * Setting this to 'ignore' will give the same undefined behavior as setting it to 'log', but without emitting any logs to `warningLogger`.
     * @default 'throw'
     */
    behaviorOnInputError?: 'throw' | 'log' | 'log&exit' | 'ignore';
    /** Wether to allow default flag values set to null being valid @default true */
    allowNullDefaultFlagValues?: boolean;
}

function __type__getType(e: any) { return typeof e };

export type JSTypes = ReturnType<typeof __type__getType>