import { isAction } from "../api/action"
import {
    $mobx,
    IDepTreeNode,
    isAtom,
    isComputedValue,
    isObservableArray,
    isObservableMap,
    isObservableObject,
    isReaction,
    isObservableSet,
    die,
    isFunction
} from "../internal"

export function getAtom(thing: any, property?: PropertyKey): IDepTreeNode {
    if (typeof thing === "object" && thing !== null) {
        if (isObservableArray(thing)) {
            if (property !== undefined) die(23)
            return (thing as any)[$mobx].atom_
        }
        if (isObservableSet(thing)) {
            return (thing as any)[$mobx]
        }
        if (isObservableMap(thing)) {
            if (property === undefined) return thing.keysAtom_
            const observable = thing.data_.get(property) || thing.hasMap_.get(property)
            if (!observable) die(25, property, getDebugName(thing))
            return observable
        }
        if (property && !thing[$mobx]) thing[property] // See #1072
        if (isObservableObject(thing)) {
            if (!property) return die(26)
            const observable = (thing as any)[$mobx].values_.get(property)
            if (!observable) die(27, property, getDebugName(thing))
            return observable
        }
        if (isAtom(thing) || isComputedValue(thing) || isReaction(thing)) {
            return thing
        }
    } else if (isFunction(thing)) {
        if (isReaction(thing[$mobx])) {
            // disposer function
            return thing[$mobx]
        }
    }
    die(28)
}

export function getAdministration(thing: any, property?: string) {
    if (!thing) die(29)
    if (property !== undefined) return getAdministration(getAtom(thing, property))
    if (isAtom(thing) || isComputedValue(thing) || isReaction(thing)) return thing
    if (isObservableMap(thing) || isObservableSet(thing)) return thing
    if (thing[$mobx]) return thing[$mobx]
    die(24, thing)
}

export function getDebugName(thing: any, property?: string): string {
    let named
    if (property !== undefined) {
        named = getAtom(thing, property)
    } else if (isAction(thing)) {
        return thing.name
    } else if (isObservableObject(thing) || isObservableMap(thing) || isObservableSet(thing)) {
        named = getAdministration(thing)
    } else {
        // valid for arrays as well
        named = getAtom(thing)
    }
    return named.name_
}