import vector
import io
import serialize
import util

fun set<T>(): set<T> {
    var toRet.construct() : set<T>
    return toRet
}

fun set<T>(item: T): set<T> {
    var toRet.construct() : set<T>
    toRet.add(item)
    return toRet
}

fun from_vector<T>(items: vector::vector<T>): set<T> {
    var toRet.construct() : set<T>
    items.for_each( fun(item: T) toRet.add(item); )
    return toRet
}

obj set<T> (Object, Serializable) {
    var data: vector::vector<T>
    fun construct(): *set<T> {
        data.construct()
        return this
    }
    fun construct(ammt: int): *set<T> {
        data.construct(ammt)
        return this
    }
    fun copy_construct(old: *set<T>) {
        data.copy_construct(&old->data)
    }
    fun operator=(rhs: ref set<T>) {
        destruct()
        copy_construct(&rhs)
    }
    fun serialize(): vector::vector<char> {
        return serialize::serialize(data)
    }
    fun unserialize(it: ref vector::vector<char>, pos: int): int {
        return data.unserialize(it, pos)
    }
    fun operator==(rhs: set<T>): bool {
        if (size() != rhs.size())
            return false
        return !data.any_true( fun(item: T): bool return !rhs.contains(item); )
    }
    fun operator!=(rhs: set<T>): bool {
        return ! (*this == rhs)
    }
    fun destruct() {
        data.destruct()
    }
    fun size():int {
        return data.size
    }
    fun contains(items: set<T>): bool {
        return items.size() == 0 || !items.any_true( fun(item: T): bool return !contains(item); )
    }
    fun contains(item: T): bool {
        return data.find(item) != -1
    }
    fun operator+=(item: T) {
        add(item)
    }
    fun operator+=(items: set<T>) {
        add(items)
    }
    fun add(item: ref T) {
        if (!contains(item))
            data.add(item)
    }
    fun add_all(items: ref set<T>) {
        add(items)
    }
    fun add(items: ref set<T>) {
        items.for_each( fun(item: ref T) add(item); )
    }
    fun remove(item: T) {
        var idx = data.find(item)
        if (idx == -1) {
            /*io::println("CANNOT FIND ITEM TO REMOVE")*/
            return
        }
        data.remove(idx)
    }
    fun for_each(func: fun(ref T):void) {
        data.for_each(func)
    }
    fun for_each(func: fun(T):void) {
        data.for_each(func)
    }
    fun any_true(func: fun(T):bool):bool {
        return data.any_true(func)
    }
    fun reduce<U>(func: fun(T,U): U, initial: U): U {
        return data.reduce(func, initial)
    }
    fun flatten_map<U>(func: fun(T):set<U>):set<U> {
        var newSet.construct(size()): set<U>
        for (var i = 0; i < size(); i++;)
            func(data[i]).for_each(fun(item: ref U) newSet.add(item);)
        return newSet
    }
    fun filter(func: fun(T):bool):set<T> {
        var newSet.construct(): set<T>
        newSet.data = data.filter(func)
        return newSet
    }
}