--[[
@module  app_iot
@summary vd960Air 设备业务: initialize 上线 / heartbeat 心跳 / 主循环驱动
@version 0.1
@date    2026.08.31
@usage
- on_connected(): MQTT 连接成功后调用 → 发 initialize(extra_info imei/iccid + link)
- heartbeat 定时任务: 60s 发 heartbeat(协议 §5.4,带 link)
- poll(): 主循环驱动 uart_app 事件重发检查(可挂 sys.timerLoopStart)
]]

local CFG = require "config"
local link_info = require "link_info"
local clock = require "clock"

local app_iot = {}

local HEARTBEAT_INTERVAL = CFG.CFG_HEARTBEAT_INTERVAL or 60

-- 上行 JSON 注入 link
local function inject_link(payload)
    if CFG.CFG_LINK_ENABLE then
        local ok, obj = pcall(json.decode, payload)
        if ok and type(obj) == "table" then
            obj.link = link_info.get()
            return json.encode(obj)
        end
    end
    return payload
end

-- 组 initialize(协议 §5.1,extra_info 含 imei/iccid V1.13)
local function build_initialize()
    local info = link_info.get()
    local payload = string.format(
        '{"msg_id":1,"cmd":"initialize","ts":%d,'
        .. '"data":{"dev_serial":"%s","model":"%s","hard_ver":"%s","soft_ver":"%s",'
        .. '"loop_ver":"%s","loop_hw_ver":"%s",'
        .. '"extra_info":{"code":"%s","imei":"%s","iccid":"%s","csq":"%s","location":""}}}',
        clock.now(),
        CFG.CFG_DEV_SERIAL, CFG.CFG_MODEL or "DLD960", CFG.CFG_HW_VER or "1.0", CFG.CFG_SW_VER or "1.0",
        CFG.CFG_LOOP_VER or "", CFG.CFG_LOOP_HW_VER or "",
        info.imsi, info.imei, info.iccid, tostring(info.csq))
    return inject_link(payload)
end

-- 组 heartbeat(协议 §5.4)
local function build_heartbeat()
    local uart_app = require "uart_app"
    local loop_ok = uart_app.get_loop_status()
    local ls = string.format('[%s,%s,%s,%s]',
        tostring(loop_ok[1]), tostring(loop_ok[2]),
        tostring(loop_ok[3]), tostring(loop_ok[4]))
    local payload = string.format(
        '{"msg_id":%d,"cmd":"heartbeat","ts":%d,'
        .. '"data":{"uptime":%d,"loop_status":%s,"net_status":true,"iot_status":true}}',
        math.floor(mstick() / 1000) % 100000 + 1000, clock.now(),
        math.floor(mstick() / 1000), ls)
    return inject_link(payload)
end

-- MQTT 连接成功后调用
function app_iot.on_connected()
    -- 发 initialize(上线)
    local payload = build_initialize()
    sys.publish("SEND_DATA_REQ", "vd960DBN", CFG.CFG_TOPIC_UP, payload, 1)
    log.info("app_iot", "initialize sent")
end

-- 心跳定时任务
local function heartbeat_task()
    while true do
        sys.wait(HEARTBEAT_INTERVAL * 1000)
        local payload = build_heartbeat()
        sys.publish("SEND_DATA_REQ", "vd960DBN", CFG.CFG_TOPIC_UP, payload, 0)
        log.info("app_iot", "heartbeat sent")
    end
end

-- 主循环驱动: 事件重发检查(500ms 粒度)
local function poll_task()
    local uart_app = require "uart_app"
    while true do
        sys.wait(500)
        uart_app.poll()
    end
end

-- 初始化(evt_queue 复位 + 启动定时任务)
function app_iot.init()
    local evt_queue = require "evt_queue"
    evt_queue.init()
    sys.taskInit(heartbeat_task)
    sys.taskInit(poll_task)
    log.info("app_iot", "init ok")
end

return app_iot