const logger = require('../util/logger');
const utils = require('../util/utils');
const Extension = require('./extension');
const zigbeeHerdsmanConverters = require('zigbee-herdsman-converters');
const settings = require('../util/settings');

const requestRegex = new RegExp(`${settings.get().mqtt.base_topic}/bridge/request/(.*)`);

class Bridge extends Extension {
    constructor(zigbee, mqtt, state, publishEntityState, eventBus) {
        super(zigbee, mqtt, state, publishEntityState, eventBus);

        this.lastJoinedDeviceIeeeAddr = null;

        this.requestLookup = {
            'device/options': this.deviceOptions.bind(this),
            'device/remove': this.deviceRemove.bind(this),
            'device/rename': this.deviceRename.bind(this),
            'group/add': this.groupAdd.bind(this),
            'group/options': this.groupOptions.bind(this),
            'group/remove': this.groupRemove.bind(this),
            'group/rename': this.groupRename.bind(this),
            'permitjoin': this.permitJoin.bind(this),
            'config/lastseen': this.configLastSeen.bind(this),
            'config/elapsed': this.configElapsed.bind(this),
            'config/loglevel': this.configLogLevel.bind(this),
        };
    }

    async onMQTTConnected() {
        this.zigbee2mqttVersion = await utils.getZigbee2mqttVersion();
        this.coordinatorVersion = await this.zigbee.getCoordinatorVersion();

        this.mqtt.subscribe(`${settings.get().mqtt.base_topic}/bridge/request/#`);
        await this.publishInfo();
        await this.publishDevices();
        await this.publishGroups();
    }

    async onMQTTMessage(topic, message) {
        const match = topic.match(requestRegex);
        if (match && this.requestLookup[match[1].toLowerCase()]) {
            try {
                message = JSON.parse(message);
            } catch (e) {
                e;
            }

            try {
                const response = await this.requestLookup[match[1].toLowerCase()](message);
                await this.mqtt.publish(`bridge/response/${match[1]}`, JSON.stringify(response));
            } catch (error) {
                logger.error(`Request '${topic}' failed with error: '${error.message}'`);
                const response = utils.getResponse(message, {}, error.message);
                await this.mqtt.publish(`bridge/response/${match[1]}`, JSON.stringify(response));
            }
        }
    }

    async onZigbeeEvent(type, data, resolvedEntity) {
        if (type === 'deviceJoined' && resolvedEntity) {
            this.lastJoinedDeviceIeeeAddr = resolvedEntity.device.ieeeAddr;
        }

        if (['deviceJoined', 'deviceLeave', 'deviceInterview'].includes(type)) {
            let payload;
            const ieeeAddress = data.device ? data.device.ieeeAddr : data.ieeeAddr;
            if (type === 'deviceJoined') payload = {friendlyName: resolvedEntity.settings.friendlyName, ieeeAddress};
            else if (type === 'deviceInterview') {
                payload = {friendlyName: resolvedEntity.settings.friendlyName, status: data.status, ieeeAddress};
                if (data.status === 'successful') {
                    payload.supported = !!resolvedEntity.definition;
                    payload.definition = resolvedEntity.definition ? {
                        model: resolvedEntity.definition.model,
                        vendor: resolvedEntity.definition.vendor,
                        description: resolvedEntity.definition.description,
                        supports: resolvedEntity.definition.supports,
                    } : null;
                }
            } else payload = {ieeeAddress}; // deviceLeave

            await this.mqtt.publish('bridge/event', JSON.stringify({type, data: payload}), {retain: false, qos: 0});
        }

        if ('deviceLeave' === type || ('deviceInterview' === type && data.status !== 'started')) {
            await this.publishDevices();
        }
    }

    /**
     * Requests
     */

    async deviceOptions(message) {
        return this.changeEntityOptions('device', message);
    }

    async groupOptions(message) {
        return this.changeEntityOptions('group', message);
    }

    async deviceRemove(message) {
        return this.removeEntity('device', message);
    }

    async groupRemove(message) {
        return this.removeEntity('group', message);
    }

    async groupAdd(message) {
        if (typeof message === 'object' && !message.hasOwnProperty('friendlyName')) {
            throw new Error(`Invalid payload`);
        }

        const friendlyName = typeof message === 'object' ? message.friendlyName : message;
        const ID = typeof message === 'object' && message.hasOwnProperty('ID') ? message.ID : null;
        const group = settings.addGroup(friendlyName, ID);
        this.zigbee.createGroup(group.ID);
        this.publishGroups();
        return utils.getResponse(message, {friendlyName: group.friendlyName, ID: group.ID}, null);
    }

    async deviceRename(message) {
        return this.renameEntity('device', message);
    }

    async groupRename(message) {
        return this.renameEntity('group', message);
    }

    async permitJoin(message) {
        const value = this.getValue(message);
        await this.zigbee.permitJoin(value);
        await this.publishInfo();
        return utils.getResponse(message, {value: value}, null);
    }

    configLastSeen(message) {
        const allowed = ['disable', 'ISO_8601', 'epoch', 'ISO_8601_local'];
        const value = this.getValue(message);
        if (!allowed.includes(value)) {
            throw new Error(`'${value}' is not an allowed value, allowed: ${allowed}`);
        }

        settings.set(['advanced', 'last_seen'], message);
        return utils.getResponse(message, {value}, null);
    }

    configElapsed(message) {
        const allowed = [true, false];
        const value = this.getValue(message);
        if (!allowed.includes(value)) {
            throw new Error(`'${value}' is not an allowed value, allowed: ${allowed}`);
        }

        settings.set(['advanced', 'elapsed'], value);
        return utils.getResponse(message, {value}, null);
    }

    configLogLevel(message) {
        const allowed = ['error', 'warn', 'info', 'debug'];
        const value = this.getValue(message);
        if (!allowed.includes(value)) {
            throw new Error(`'${value}' is not an allowed value, allowed: ${allowed}`);
        }

        logger.setLevel(value);
        return utils.getResponse(message, {value}, null);
    }

    /**
     * Utils
     */

    getValue(message) {
        if (typeof message === 'object') {
            if (!message.hasOwnProperty('value')) {
                throw new Error('No value given');
            }

            return message.value;
        } else {
            return message;
        }
    }

    changeEntityOptions(entityType, message) {
        if (typeof message !== 'object' || !message.hasOwnProperty('ID') || !message.hasOwnProperty('options')) {
            throw new Error(`Invalid payload`);
        }

        const ID = message.ID;
        const entity = this.getEntity(entityType, ID);
        settings.changeEntityOptions(ID, message.options);
        const cleanup = (o) => {
            delete o.friendlyName; delete o.friendly_name; delete o.ID; delete o.type; delete o.devices;
            return o;
        };
        const oldOptions = cleanup(entity.settings);
        const newOptions = cleanup(settings.getEntity(ID));
        return utils.getResponse(message, {from: oldOptions, to: newOptions, ID}, null);
    }

    renameEntity(entityType, message) {
        const deviceAndHasLast = entityType === 'device' && typeof message === 'object' && message.last === true;
        if (typeof message !== 'object' || (!message.hasOwnProperty('from') && !deviceAndHasLast) ||
            !message.hasOwnProperty('to')) {
            throw new Error(`Invalid payload`);
        }

        if (deviceAndHasLast && !this.lastJoinedDeviceIeeeAddr) {
            throw new Error('No device has joined since start');
        }

        const from = deviceAndHasLast ? this.lastJoinedDeviceIeeeAddr : message.from;
        const to = message.to;
        const entity = this.getEntity(entityType, from);

        settings.changeFriendlyName(from, to);

        if (entity.type === 'device') {
            this.publishDevices();
            this.eventBus.emit(`deviceRenamed`, {device: entity.device});
        } else {
            this.publishGroups();
            this.eventBus.emit(`groupRenamed`, {group: entity.group});
        }

        return utils.getResponse(message, {from: entity.settings.friendlyName, to}, null);
    }

    async removeEntity(entityType, message) {
        const ID = typeof message === 'object' ? message.ID : message.trim();
        const entity = this.getEntity(entityType, ID);

        let ban = false;
        let force = false;
        let banForceLog = '';

        if (entityType === 'device' && typeof message === 'object') {
            ban = !!message.ban;
            force = !!message.force;
            banForceLog = ` (ban: ${ban}, force: ${force})`;
        }

        try {
            logger.info(`Removing ${entity.type} '${entity.settings.friendlyName}'${banForceLog}`);
            if (entity.type === 'device') {
                if (ban) {
                    settings.banDevice(entity.settings.ID);
                }

                if (force) {
                    await entity.device.removeFromDatabase();
                } else {
                    await entity.device.removeFromNetwork();
                }
            } else {
                await entity.group.removeFromDatabase();
            }

            // Fire event
            if (entity.type === 'device') {
                this.eventBus.emit('deviceRemoved', {device: entity.device});
            }

            // Remove from configuration.yaml
            if (entity.type === 'device') {
                settings.removeDevice(entity.settings.ID);
            } else {
                settings.removeGroup(entity.settings.ID);
            }

            // Remove from state
            this.state.remove(entity.settings.ID);

            logger.info(`Successfully removed ${entity.type} '${entity.settings.friendlyName}'${banForceLog}`);

            if (entity.type === 'device') {
                this.publishDevices();
                return utils.getResponse(message, {ID, ban: ban, force: force}, null);
            } else {
                this.publishGroups();
                return utils.getResponse(message, {ID}, null);
            }
        } catch (error) {
            throw new Error(
                `Failed to remove ${entity.type} '${entity.settings.friendlyName}'${banForceLog} (${error})`,
            );
        }
    }

    getEntity(type, ID) {
        const entity = this.zigbee.resolveEntity(ID);
        if (!entity || entity.type !== type) {
            throw new Error(`${utils.capitalize(type)} '${ID}' does not exist`);
        }
        return entity;
    }

    async publishInfo() {
        const payload = {
            version: this.zigbee2mqttVersion.version,
            commit: this.zigbee2mqttVersion.commitHash,
            coordinator: this.coordinatorVersion,
            logLevel: logger.getLevel(),
            permitJoin: await this.zigbee.getPermitJoin(),
        };

        await this.mqtt.publish('bridge/info', JSON.stringify(payload), {retain: true, qos: 0});
    }

    async publishDevices(topic, message) {
        const devices = this.zigbee.getClients().map((device) => {
            const definition = zigbeeHerdsmanConverters.findByDevice(device);
            const resolved = this.zigbee.resolveEntity(device);
            const definitionPayload = definition ? {
                model: definition.model,
                vendor: definition.vendor,
                description: definition.description,
                supports: definition.supports,
            } : null;

            return {
                ieeeAddress: device.ieeeAddr,
                type: device.type,
                networkAddress: device.networkAddress,
                supported: !!definition,
                friendlyName: resolved.name,
                definition: definitionPayload,
                powerSource: device.powerSource,
                softwareBuildID: device.softwareBuildID,
                dateCode: device.dateCode,
                interviewing: device.interviewing,
                interviewCompleted: device.interviewCompleted,
            };
        });

        await this.mqtt.publish('bridge/devices', JSON.stringify(devices), {retain: true, qos: 0});
    }

    async publishGroups(topic, message) {
        const groups = this.zigbee.getGroups().map((group) => {
            const resolved = this.zigbee.resolveEntity(group);
            return {
                ID: group.groupID,
                friendlyName: resolved.name,
                members: group.members.map((m) => {
                    return {
                        ieeeAddress: m.deviceIeeeAddress,
                        endpoint: m.ID,
                    };
                }),
            };
        });

        await this.mqtt.publish('bridge/groups', JSON.stringify(groups), {retain: true, qos: 0});
    }
}

module.exports = Bridge;