const API = require('../../../lib/API')
const { BaseStdResponse } = require('../../../BaseStdResponse')
const { TaskScheduler } = require('../../../lib/QK/TaskScheduler')

const scheduler = new TaskScheduler()

function getClientCredentials(body) {
    return {
        clientId: body.client_id,
        clientSecret: body.client_secret
    }
}

function fail(res, err, fallback = '客户端请求失败') {
    return res.json({
        ...BaseStdResponse.ERR,
        msg: err?.message || fallback
    })
}

class RegisterClient extends API {
    constructor() {
        super()
        this.setPath('/QK/Client/Register')
        this.setMethod('POST')
    }

    async onRequest(req, res) {
        try {
            const { clientId, clientSecret } = getClientCredentials(req.body)
            const result = await scheduler.registerClient(clientId, clientSecret, req.body)
            this.logger.info(`[QK][API][Register] 客户端注册成功 clientId=${result.client_id} max_slots=${result.max_slots}`)
            return res.json({ ...BaseStdResponse.OK, data: result })
        } catch (err) {
            this.logger.error(`抢课客户端注册失败：${err.stack || err}`)
            return fail(res, err, '抢课客户端注册失败')
        }
    }
}

class HeartbeatClient extends API {
    constructor() {
        super()
        this.setPath('/QK/Client/Heartbeat')
        this.setMethod('POST')
    }

    async onRequest(req, res) {
        try {
            const { clientId, clientSecret } = getClientCredentials(req.body)
            const result = await scheduler.heartbeat(clientId, clientSecret, req.body)
            return res.json({ ...BaseStdResponse.OK, data: result })
        } catch (err) {
            this.logger.error(`抢课客户端心跳失败：${err.stack || err}`)
            return fail(res, err, '抢课客户端心跳失败')
        }
    }
}

class PullTasks extends API {
    constructor() {
        super()
        this.setPath('/QK/Client/PullTasks')
        this.setMethod('POST')
    }

    async onRequest(req, res) {
        try {
            const { clientId, clientSecret } = getClientCredentials(req.body)
            const tasks = await scheduler.pullTasks(clientId, clientSecret, req.body.count)
            if (tasks.length > 0) {
                this.logger.info(`[QK][API][PullTasks] clientId=${clientId} 拉取到 ${tasks.length} 个任务 taskIds=${tasks.map(t => t.id).join(',')}`)
            }
            return res.json({ ...BaseStdResponse.OK, data: tasks })
        } catch (err) {
            this.logger.error(`抢课客户端拉取任务失败：${err.stack || err}`)
            return fail(res, err, '抢课客户端拉取任务失败')
        }
    }
}

class ReclaimTasks extends API {
    constructor() {
        super()
        this.setPath('/QK/Client/ReclaimTasks')
        this.setMethod('POST')
    }

    async onRequest(req, res) {
        try {
            const { clientId, clientSecret } = getClientCredentials(req.body)
            const tasks = await scheduler.reclaimTasks(clientId, clientSecret)
            if (tasks.length > 0) {
                this.logger.info(`[QK][API][ReclaimTasks] clientId=${clientId} 回收 ${tasks.length} 个任务 taskIds=${tasks.map(t => t.id).join(',')}`)
            }
            return res.json({ ...BaseStdResponse.OK, data: tasks })
        } catch (err) {
            this.logger.error(`抢课客户端回收任务失败：${err.stack || err}`)
            return fail(res, err, '抢课客户端回收任务失败')
        }
    }
}

class ReleaseTasks extends API {
    constructor() {
        super()
        this.setPath('/QK/Client/ReleaseTasks')
        this.setMethod('POST')
    }

    async onRequest(req, res) {
        try {
            const { clientId, clientSecret } = getClientCredentials(req.body)
            const result = await scheduler.releaseTasks(clientId, clientSecret, req.body)
            if (result.released > 0) {
                this.logger.info(`[QK][API][ReleaseTasks] clientId=${clientId} 释放 ${result.released} 个任务 taskIds=${result.task_ids.join(',')}`)
            }
            return res.json({ ...BaseStdResponse.OK, data: result })
        } catch (err) {
            this.logger.error(`抢课客户端释放任务失败：${err.stack || err}`)
            return fail(res, err, '抢课客户端释放任务失败')
        }
    }
}

class ReportResult extends API {
    constructor() {
        super()
        this.setPath('/QK/Client/ReportResult')
        this.setMethod('POST')
    }

    async onRequest(req, res) {
        try {
            const { clientId, clientSecret } = getClientCredentials(req.body)
            const result = await scheduler.reportResult(clientId, clientSecret, req.body)
            this.logger.info(`[QK][API][ReportResult] clientId=${clientId} taskId=${result.task_id} status=${result.status}`)
            return res.json({ ...BaseStdResponse.OK, data: result })
        } catch (err) {
            this.logger.error(`抢课客户端上报结果失败：${err.stack || err}`)
            return fail(res, err, '抢课客户端上报结果失败')
        }
    }
}

class ReportProgress extends API {
    constructor() {
        super()
        this.setPath('/QK/Client/ReportProgress')
        this.setMethod('POST')
    }

    async onRequest(req, res) {
        try {
            const { clientId, clientSecret } = getClientCredentials(req.body)
            const result = await scheduler.reportProgress(clientId, clientSecret, req.body)
            return res.json({ ...BaseStdResponse.OK, data: result })
        } catch (err) {
            this.logger.error(`抢课客户端上报进度失败：${err.stack || err}`)
            return fail(res, err, '抢课客户端上报进度失败')
        }
    }
}

module.exports = {
    RegisterClient,
    HeartbeatClient,
    PullTasks,
    ReclaimTasks,
    ReleaseTasks,
    ReportResult,
    ReportProgress
}