const {Subscribable} = require("./subscribable.js")

class SubscribeMap extends Subscribable {
	constructor() {
		super()
		Object.assign(this.events, {
			addItem: [],
			editItem: [],
			deleteItem: [],
			changeItem: [],
			askSet: []
		})
		Object.assign(this.eventDeps, {
			addItem: ["changeItem"],
			editItem: ["changeItem"],
			deleteItem: ["changeItem"],
			changeItem: [],
			askSet: []
		})
		this.backing = new Map()
	}

	has(key) {
		return this.backing.has(key)
	}

	forEach(f) {
		for (const key of this.backing.keys()) {
			f(key, this.backing.get(key))
		}
	}

	askSet(key, value) {
		this.broadcast("askSet", key, value)
	}

	set(key, value) {
		const existed = this.backing.has(key)
		this.backing.set(key, value)
		if (existed) {
			this.broadcast("addItem", key)
		} else {
			this.broadcast("editItem", key)
		}
	}

	delete(key) {
		if (this.backing.has(key)) {
			this.backing.delete(key)
			this.broadcast("deleteItem", key)
		}
	}
}

module.exports = {SubscribeMap}