'use strict';

var assert = require('assert');
var index = require('./subscribers/index.js');
var timestamps = require('./subscribers/timestamps.js');
var modelsLifecycles = require('./subscribers/models-lifecycles.js');

const createLifecyclesProvider = (db)=>{
    let subscribers = [
        timestamps.timestampsLifecyclesSubscriber,
        modelsLifecycles.modelsLifecyclesSubscriber
    ];
    let isLifecycleHooksDisabled = false;
    return {
        subscribe (subscriber) {
            assert.strict(index.isValidSubscriber(subscriber), 'Invalid subscriber. Expected function or object');
            subscribers.push(subscriber);
            return ()=>subscribers.splice(subscribers.indexOf(subscriber), 1);
        },
        clear () {
            subscribers = [];
        },
        disable () {
            isLifecycleHooksDisabled = true;
        },
        enable () {
            isLifecycleHooksDisabled = false;
        },
        createEvent (action, uid, properties, state) {
            const model = db.metadata.get(uid);
            return {
                action,
                model,
                state,
                ...properties
            };
        },
        /**
     * @param {string} action
     * @param {string} uid
     * @param {{ params?: any, result?: any }} properties
     * @param {Map<any, any>} states
     */ async run (action, uid, properties, states = new Map()) {
            if (isLifecycleHooksDisabled) return states;
            for(let i = 0; i < subscribers.length; i += 1){
                const subscriber = subscribers[i];
                if (typeof subscriber === 'function') {
                    const state = states.get(subscriber) || {};
                    const event = this.createEvent(action, uid, properties, state);
                    await subscriber(event);
                    if (event.state) {
                        states.set(subscriber, event.state || state);
                    }
                    continue;
                }
                const hasAction = action in subscriber;
                const hasModel = !subscriber.models || subscriber.models.includes(uid);
                if (hasAction && hasModel) {
                    const state = states.get(subscriber) || {};
                    const event = this.createEvent(action, uid, properties, state);
                    await subscriber[action]?.(event);
                    if (event.state) {
                        states.set(subscriber, event.state);
                    }
                }
            }
            return states;
        }
    };
};

exports.createLifecyclesProvider = createLifecyclesProvider;
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