---@diagnostic disable: deprecated
local pub    = require 'pub'
local thread = require 'bee.thread'
local await  = require 'await'
local timer  = require 'timer'
local proto  = require 'proto'
local vm     = require 'vm'
local util   = require 'utility'
local files  = require 'files'
local lang   = require 'language'
local ws     = require 'workspace'
local time   = require 'bee.time'
local fw     = require 'filewatch'
local furi   = require 'file-uri'

---@class service
local m = {}
m.type = 'service'
m.idleClock = 0.0
m.sleeping = false

local function countMemory()
    local mems = {}
    local total  = 0
    mems[0] = collectgarbage 'count'
    total = total + collectgarbage 'count'
    for id, brave in ipairs(pub.braves) do
        mems[id] = brave.memory
        total = total + brave.memory
    end
    return total, mems
end

function m.reportMemoryCollect()
    local totalMemBefore = countMemory()
    local clock = os.clock()
    collectgarbage()
    local passed = os.clock() - clock
    local totalMemAfter, mems  = countMemory()

    local lines = {}
    lines[#lines+1] = '    --------------- Memory ---------------'
    lines[#lines+1] = ('        Total: %.3f(%.3f) MB'):format(totalMemAfter / 1000.0, totalMemBefore / 1000.0)
    for i = 0, #mems do
        lines[#lines+1] = ('        # %02d : %.3f MB'):format(i, mems[i] / 1000.0)
    end
    lines[#lines+1] = ('        Collect garbage takes [%.3f] sec'):format(passed)
    return table.concat(lines, '\n')
end

function m.reportMemory()
    local totalMem, mems = countMemory()

    local lines = {}
    lines[#lines+1] = '    --------------- Memory ---------------'
    lines[#lines+1] = ('        Total: %.3f MB'):format(totalMem / 1000.0)
    for i = 0, #mems do
        lines[#lines+1] = ('        # %02d : %.3f MB'):format(i, mems[i] / 1000.0)
    end
    return table.concat(lines, '\n')
end

function m.reportTask()
    local total     = 0
    local running   = 0
    local suspended = 0
    local normal    = 0
    local dead      = 0

    for co in pairs(await.coMap) do
        total = total + 1
        local status = coroutine.status(co)
        if status == 'running' then
            running = running + 1
        elseif status == 'suspended' then
            suspended = suspended + 1
        elseif status == 'normal' then
            normal = normal + 1
        elseif status == 'dead' then
            dead = dead + 1
        end
    end

    local lines = {}
    lines[#lines+1] = '    --------------- Coroutine ---------------'
    lines[#lines+1] = ('        Total:     %d'):format(total)
    lines[#lines+1] = ('        Running:   %d'):format(running)
    lines[#lines+1] = ('        Suspended: %d'):format(suspended)
    lines[#lines+1] = ('        Normal:    %d'):format(normal)
    lines[#lines+1] = ('        Dead:      %d'):format(dead)
    return table.concat(lines, '\n')
end

function m.reportCache()
    local total = 0
    local dead  = 0

    for cache in pairs(vm.cacheTracker) do
        total = total + 1
        if cache.dead then
            dead = dead + 1
        end
    end

    local lines = {}
    lines[#lines+1] = '    --------------- Cache ---------------'
    lines[#lines+1] = ('        Total: %d'):format(total)
    lines[#lines+1] = ('        Dead:  %d'):format(dead)
    return table.concat(lines, '\n')
end

function m.reportProto()
    local holdon  = 0
    local waiting = 0

    for _ in pairs(proto.holdon) do
        holdon = holdon + 1
    end
    for _ in pairs(proto.waiting) do
        waiting = waiting + 1
    end

    local lines = {}
    lines[#lines+1] = '    ---------------  RPC  ---------------'
    lines[#lines+1] = ('        Holdon:   %d'):format(holdon)
    lines[#lines+1] = ('        Waiting:  %d'):format(waiting)
    return table.concat(lines, '\n')
end

function m.report()
    local t = timer.loop(600.0, function ()
        local lines = {}
        lines[#lines+1] = ''
        lines[#lines+1] = '========= Medical Examination Report ========='
        lines[#lines+1] = m.reportMemory()
        lines[#lines+1] = m.reportTask()
        lines[#lines+1] = m.reportCache()
        lines[#lines+1] = m.reportProto()
        lines[#lines+1] = '=============================================='

        log.info(table.concat(lines, '\n'))
    end)
    t:onTimer()
end

function m.eventLoop()
    pub.task('timer', 1)
    pub.on('wakeup', function ()
        m.reportStatus()
        fw.update()
    end)

    local function busy()
        if not m.workingClock then
            m.workingClock = time.monotonic()
            m.reportStatus()
        end
    end

    local function idle()
        if m.workingClock then
            m.workingClock = nil
            m.reportStatus()
        end
    end

    local function doSomething()
        pub.step(false)
        if not await.step() then
            return false
        end
        busy()
        return true
    end

    local function sleep()
        idle()
        for _ = 1, 10 do
            thread.sleep(0.1)
            if doSomething() then
                return
            end
        end
        pub.step(true)
    end

    while true do
        if doSomething() then
            goto CONTINUE
        end
        timer.update()
        if doSomething() then
            goto CONTINUE
        end
        sleep()
        ::CONTINUE::
    end
end

local showStatusTip = math.random(100) == 1

function m.reportStatus()
    local info = {}
    if m.workingClock and time.monotonic() - m.workingClock > 100 then
        info.text = '$(loading~spin)Lua'
    elseif m.sleeping then
        info.text = "💤Lua"
    else
        info.text = '😺Lua'
    end

    local tooltips = {}
    local params = {
        ast = files.astCount,
        max = files.fileCount,
        mem = collectgarbage('count') / 1000,
    }
    for i, scp in ipairs(ws.folders) do
        tooltips[i] = lang.script('WINDOW_LUA_STATUS_WORKSPACE', furi.decode(scp.uri))
    end
    tooltips[#tooltips+1] = lang.script('WINDOW_LUA_STATUS_CACHED_FILES', params)
    tooltips[#tooltips+1] = lang.script('WINDOW_LUA_STATUS_MEMORY_COUNT', params)
    if showStatusTip then
        tooltips[#tooltips+1] = lang.script('WINDOW_LUA_STATUS_TIP')
    end

    info.tooltip = table.concat(tooltips, '\n')
    if util.equal(m.lastInfo, info) then
        return
    end
    m.lastInfo = info
    proto.notify('$/status/report', info)
end

function m.testVersion()
    local stack = debug.setcstacklimit(200)
    debug.setcstacklimit(stack + 1)
    if type(stack) == 'number' and debug.setcstacklimit(stack) == stack + 1 then
        proto.notify('window/showMessage', {
            type = 2,
            message = 'It seems to be running in Lua 5.4.0 or Lua 5.4.1 . Please upgrade to Lua 5.4.2 or above. Otherwise, it may encounter weird "C stack overflow", resulting in failure to work properly',
        })
    end
end

function m.lockCache()
    local fs = require 'bee.filesystem'
    local sp = require 'bee.subprocess'
    local cacheDir = string.format('%s/cache', LOGPATH)
    local myCacheDir = string.format('%s/%d'
        , cacheDir
        , sp.get_id()
    )
    fs.create_directories(fs.path(myCacheDir))
    local err
    m.lockFile, err = io.open(myCacheDir .. '/.lock', 'wb')
    if err then
        log.error(err)
    end
    pub.task('removeCaches', cacheDir)
end

function m.start()
    util.enableCloseFunction()
    await.setErrorHandle(log.error)
    pub.recruitBraves(4)
    proto.listen()
    m.report()
    m.testVersion()
    m.lockCache()

    require 'provider'

    m.eventLoop()
end

return m