import { findSourceMap } from "node:module";
import { markAsUntransferable } from "node:worker_threads";
import { LDAPAttribute } from "./ConfigLoader";

export enum ClassType {
	eUnknown,
	eAbstract,
	eStructural,
	eAuxiliary
}

abstract class LDAPSchemaItem {
	public constructor(def: string) {
		this.fDefinition = def;
		this.fName = def.match(/NAME[\s\(]+'([^']+)'/)?.pop() || "";
		this.fDescription = def.match(/DESC\s+'([^']+)'/)?.pop() || "";
		this.fAliases = (def.match(/NAME\s*\(\s*([^\)]+)\)/)?.pop() || "").split(/\s+/).map(i => i.startsWith("'") ? i.substr(1, i.length - 2) : i).filter(i => i.length);
		if (this.fAliases.indexOf(this.fName) === -1)
			this.fAliases.push(this.fName);
	}

	public GetName(): string {
		return this.fName;
	}

	public GetDescription(): string {
		return this.fDescription;
	}

	public Match(str: string): boolean {
		for (let i of this.fAliases)
			if (i.toLowerCase() == str)
				return true;
		return false;
	}

	protected readonly fDefinition: string;
	private fName: string;
	private fAliases: Array<string>;
	private fDescription: string;
}

function Find(key: string, arr: Iterable<LDAPSchemaItem>): LDAPSchemaItem | null {
	key = key.toLowerCase();
	for (let i of arr)
		if (i.Match(key))
			return i;
	return null;
}

export class LDAPSchemaAttribute extends LDAPSchemaItem{
	public constructor(def: string) {
		super(def);
		this.fSyntax = def.match(/SYNTAX\s+([0-9\.]+)/)?.pop() || null;
	}

	private fSyntax: string|null;
}

export class LDAPSchemaObjectClass extends LDAPSchemaItem {
	public constructor(def: string, attributeDic: Map<string, LDAPSchemaAttribute>) {
		super(def);
		const abstract = /\s+ABSTRACT\s+/.test(def) ? 1 : 0;
		const aux = /\s+AUXILIARY\s+/.test(def) ? 1 : 0;
		const structural = /\s+STRUCTURAL\s+/.test(def) ? 1 : 0;
		if (abstract + aux + structural !== 1)
			this.fType = ClassType.eUnknown;
		else if (abstract)
			this.fType = ClassType.eAbstract;
		else if (aux)
			this.fType = ClassType.eAuxiliary;
		else if (structural)
			this.fType = ClassType.eStructural;
		else
			this.fType = ClassType.eUnknown;
		this.fParent = def.match(/\s+SUP\s+([^\s]+)\s/)?.pop() || null;
	}

	private defToAttributes(type: string): string[] {
		const reg = type === "MUST" ? /\s+MUST\s+(\w+|\([^\)]+\))/ : /\s+MAY\s+(\w+|\([^\)]+\))/;
		const res = (this.fDefinition.match(reg) || [])[1];
		if (!res)
			return new Array();
		let result = new Array();

		if (!res.startsWith('(')) {
			result.push(res.trim());
			return result;
		}
		for (let i of res.substr(1, res.length -2).split("$"))
			result.push(i.trim());
		return result;
	}

	public Consolidate(classes: Map<string, LDAPSchemaObjectClass>, attributes: Map<string, LDAPSchemaAttribute>) {
		if (this.fFinalized)
			return;
		this.fFinalized = true;
		let parent = this.fParent ? (Find(this.fParent, classes.values()) as LDAPSchemaObjectClass|null) : null;
		if (parent) {
			parent.Consolidate(classes, attributes);
			for (let [key, attr] of parent.fMayAttributes) {
				if (!this.fMustAttributes.has(key))
					this.fMayAttributes.set(key, attr);
			}
			for (let [key, attr] of parent.fMustAttributes) {
				this.fMustAttributes.set(key, attr);
				if (this.fMayAttributes.has(key))
					this.fMayAttributes.delete(key);
			}
		}
		for (let mustAttr of this.defToAttributes("MUST")) {
			if (this.fMustAttributes.has(mustAttr))
				continue;
			if (this.fMayAttributes.has(mustAttr))
				this.fMayAttributes.delete(mustAttr);
			let attr = Find(mustAttr, attributes.values()) as LDAPSchemaAttribute|null;
			attr && this.fMustAttributes.set(mustAttr, attr);
		}
		for (let mayAttr of this.defToAttributes("MAY")) {
			if (this.fMayAttributes.has(mayAttr) || this.fMustAttributes.has(mayAttr))
				continue;
			let attr = Find(mayAttr, attributes.values()) as LDAPSchemaAttribute | null;
			attr && this.fMayAttributes.set(mayAttr, attr);
		}
		return;
	}

	public HasAttribute(key: string): boolean {
		return !!(Find(key, this.fMayAttributes.values()) || Find(key, this.fMustAttributes.values()));
	}

	public HasMust(attr: string): boolean {
		return this.fMustAttributes.has(attr);
	}

    public ListDescriptions(): Map<string, string> {
        let result = new Map();
        for (let [key, data] of this.fMayAttributes) result.set(key, data.GetDescription());
        for (let [key, data] of this.fMustAttributes) result.set(key, data.GetDescription());
        return result;
    }

	public ListMayAttributes(): string[] {
		let result = new Array();
		for (let [key, _] of this.fMayAttributes) result.push(key);
		return result;
	}

	public ListMustAttributes(): string[] {
		let result = new Array();
		for (let [key, _] of this.fMustAttributes) result.push(key);
		return result;
	}

	public ListAttributes(): string[] {
		let result = new Array();
		for (let [key, _] of this.fMustAttributes) result.push(key);
		for (let [key, _] of this.fMayAttributes) result.push(key);
		return result;
	}

	public GetType(): ClassType {
		return this.fType;
	}

	private fParent: string|null;
	private fType: ClassType;
	private fFinalized: boolean = false;
	private fMayAttributes: Map<string, LDAPSchemaAttribute> = new Map();
	private fMustAttributes: Map<string, LDAPSchemaAttribute> = new Map();
}