import { bindThis } from '@/decorators.js';
import 藍 from '@/ai.js';
import IModule from '@/module.js';
import getDate from '@/utils/get-date.js';
import type { User } from '@/misskey/user.js';
import { genItem } from '@/vocabulary.js';

export type FriendDoc = {
	userId: string;
	user: User;
	name?: string | null;
	love?: number;
	lastLoveIncrementedAt?: string;
	todayLoveIncrements?: number;
	perModulesData?: any;
	married?: boolean;
	transferCode?: string;
	reversiStrength?: number | null;
};

export default class Friend {
	private ai: 藍;

	public get userId() {
		return this.doc.userId;
	}

	public get name() {
		return this.doc.name;
	}

	public get love() {
		return this.doc.love || 0;
	}

	public get married() {
		return this.doc.married;
	}

	public doc: FriendDoc;

	constructor(ai: 藍, opts: { user?: User, doc?: FriendDoc }) {
		this.ai = ai;

		if (opts.user) {
			const exist = this.ai.friends.findOne({
				userId: opts.user.id
			});

			if (exist == null) {
				const inserted = this.ai.friends.insertOne({
					userId: opts.user.id,
					user: opts.user
				});

				if (inserted == null) {
					throw new Error('Failed to insert friend doc');
				}

				this.doc = inserted;
			} else {
				this.doc = exist;
				this.doc.user = { ...this.doc.user, ...opts.user };
				this.save();
			}
		} else if (opts.doc) {
			this.doc = opts.doc;
		} else {
			throw new Error('No friend info specified');
		}
	}

	@bindThis
	public updateUser(user: Partial<User>) {
		this.doc.user = {
			...this.doc.user,
			...user,
		};
		this.save();
	}

	@bindThis
	public getPerModulesData(module: IModule) {
		if (this.doc.perModulesData == null) {
			this.doc.perModulesData = {};
			this.doc.perModulesData[module.name] = {};
			this.save();
		} else if (this.doc.perModulesData[module.name] == null) {
			this.doc.perModulesData[module.name] = {};
			this.save();
		}

		return this.doc.perModulesData[module.name];
	}

	@bindThis
	public setPerModulesData(module: IModule, data: any) {
		if (this.doc.perModulesData == null) {
			this.doc.perModulesData = {};
		}

		this.doc.perModulesData[module.name] = data;

		this.save();
	}

	@bindThis
	public incLove(amount = 1) {
		const today = getDate();

		if (this.doc.lastLoveIncrementedAt != today) {
			this.doc.todayLoveIncrements = 0;
		}

		// 1日に上げられる親愛度は最大3
		if (this.doc.lastLoveIncrementedAt == today && (this.doc.todayLoveIncrements || 0) >= 3) return;

		if (this.doc.love == null) this.doc.love = 0;
		this.doc.love += amount;

		// 最大 100
		if (this.doc.love > 100) this.doc.love = 100;

		this.doc.lastLoveIncrementedAt = today;
		this.doc.todayLoveIncrements = (this.doc.todayLoveIncrements || 0) + amount;
		this.save();

		this.ai.log(`💗 ${this.userId} +${amount}`);
	}

	@bindThis
	public decLove(amount = 1) {
		// 親愛度MAXなら下げない
		if (this.doc.love === 100) return;

		if (this.doc.love == null) this.doc.love = 0;
		this.doc.love -= amount;

		// 最低 -30
		if (this.doc.love < -30) this.doc.love = -30;

		// 親愛度マイナスなら名前を忘れる
		if (this.doc.love < 0) {
			this.doc.name = null;
		}

		this.save();

		this.ai.log(`💢 ${this.userId} -${amount}`);
	}

	@bindThis
	public updateName(name: string) {
		this.doc.name = name;
		this.save();
	}

	@bindThis
	public updateReversiStrength(strength: number | null) {
		if (strength == null) {
			this.doc.reversiStrength = null;
			this.save();
			return;
		}

		if (strength < 0) strength = 0;
		if (strength > 5) strength = 5;
		this.doc.reversiStrength = strength;
		this.save();
	}

	@bindThis
	public save() {
		this.ai.friends.update(this.doc);
	}

	@bindThis
	public generateTransferCode(): string {
		const code = genItem();

		this.doc.transferCode = code;
		this.save();

		return code;
	}

	@bindThis
	public transferMemory(code: string): boolean {
		const src = this.ai.friends.findOne({
			transferCode: code
		});

		if (src == null) return false;

		this.doc.name = src.name;
		this.doc.love = src.love;
		this.doc.married = src.married;
		this.doc.perModulesData = src.perModulesData;
		this.save();

		// TODO: 合言葉を忘れる

		return true;
	}
}