--!A cross-platform build utility based on Lua
--
-- Licensed under the Apache License, Version 2.0 (the "License");
-- you may not use this file except in compliance with the License.
-- You may obtain a copy of the License at
--
--     http://www.apache.org/licenses/LICENSE-2.0
--
-- Unless required by applicable law or agreed to in writing, software
-- distributed under the License is distributed on an "AS IS" BASIS,
-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-- See the License for the specific language governing permissions and
-- limitations under the License.
--
-- Copyright (C) 2015-present, Xmake Open Source Community.
--
-- @author      ruki
-- @file        client.lua
--

-- imports
import("core.base.bytes")
import("core.base.base64")
import("core.base.socket")
import("core.base.option")
import("core.base.hashset")
import("core.base.scheduler")
import("core.base.bloom_filter")
import("core.project.config", {alias = "project_config"})
import("lib.detect.find_tool")
import("private.service.client_config", {alias = "config"})
import("private.service.message")
import("private.service.client")
import("private.service.stream", {alias = "socket_stream"})

-- define module
local remote_cache_client = remote_cache_client or client()
local super = remote_cache_client:class()

-- init client
function remote_cache_client:init()
    super.init(self)

    -- init address
    local address = assert(config.get("remote_cache.connect"), "config(remote_cache.connect): not found!")
    self:address_set(address)

    -- get project directory
    local projectdir = os.projectdir()
    local projectfile = os.projectfile()
    if projectfile and os.isfile(projectfile) and projectdir then
        self._PROJECTDIR = projectdir
        self._WORKDIR = path.join(project_config.directory(), "service", "remote_cache")
    else
        raise("we need to enter a project directory with xmake.lua first!")
    end

    -- init sockets
    self._FREESOCKS = {}
    self._OPENSOCKS = hashset.new()

    -- init timeout
    self._SEND_TIMEOUT = config.get("remote_cache.send_timeout") or config.get("send_timeout") or -1
    self._RECV_TIMEOUT = config.get("remote_cache.recv_timeout") or config.get("recv_timeout") or -1
    self._CONNECT_TIMEOUT = config.get("remote_cache.connect_timeout") or config.get("connect_timeout") or 10000
end

-- get class
function remote_cache_client:class()
    return remote_cache_client
end

-- connect to the remote server
function remote_cache_client:connect()
    if self:is_connected() then
        print("%s: has been connected!", self)
        return
    end

    -- Do we need user authorization?
    local token = config.get("remote_cache.token")
    if not token and self:user() then

        -- get user password
        cprint("Please input user ${bright}%s${clear} password to connect <%s:%d>:", self:user(), self:addr(), self:port())
        io.flush()
        local pass = (io.read() or ""):trim()
        assert(pass ~= "", "password is empty!")

        -- compute user authorization
        token = base64.encode(self:user() .. ":" .. pass)
        token = hash.md5(bytes(token))
    end

    -- do connect
    local addr = self:addr()
    local port = self:port()
    local sock = assert(socket.connect(addr, port, {timeout = self:connect_timeout()}), "%s: server unreachable!", self)
    local session_id = self:session_id()
    local ok = false
    local errors
    print("%s: connect %s:%d ..", self, addr, port)
    if sock then
        local stream = socket_stream(sock, {send_timeout = self:send_timeout(), recv_timeout = self:recv_timeout()})
        if stream:send_msg(message.new_connect(session_id, {token = token})) and stream:flush() then
            local msg = stream:recv_msg()
            if msg then
                vprint(msg:body())
                if msg:success() then
                    ok = true
                else
                    errors = msg:errors()
                end
            end
        end
    end
    if ok then
        print("%s: connected!", self)
    else
        print("%s: connect %s:%d failed, %s", self, addr, port, errors or "unknown")
    end

    -- update status
    local status = self:status()
    status.addr = addr
    status.port = port
    status.token = token
    status.connected = ok
    status.session_id = session_id
    self:status_save()
end

-- disconnect server
function remote_cache_client:disconnect()
    if not self:is_connected() then
        print("%s: has been disconnected!", self)
        return
    end

    -- update status
    local status = self:status()
    status.token = nil
    status.connected = false
    self:status_save()
    print("%s: disconnected!", self)
end

-- pull cache file
function remote_cache_client:pull(cachekey, cachefile)
    assert(self:is_connected(), "%s: has been not connected!", self)
    local addr = self:addr()
    local port = self:port()
    local sock = assert(self:_sock_open(), "open socket failed!")
    local session_id = self:session_id()
    local errors
    local ok = false
    local exists = false
    local extrainfo
    dprint("%s: pull cache(%s) in %s:%d ..", self, cachekey, addr, port)
    local stream = socket_stream(sock, {send_timeout = self:send_timeout(), recv_timeout = self:recv_timeout()})
    if stream:send_msg(message.new_pull(session_id, cachekey, {token = self:token()})) and stream:flush() then
        if stream:recv_file(cachefile) then
            local msg = stream:recv_msg()
            if msg then
                dprint(msg:body())
                if msg:success() then
                    ok = true
                    exists = msg:body().exists
                    extrainfo = msg:body().extrainfo
                else
                    errors = msg:errors()
                end
            end
        else
            errors = "recv cache file failed"
        end
    end
    self:_sock_close(sock)
    if ok then
        dprint("%s: pull cache(%s) ok!", self, cachekey)
    else
        dprint("%s: pull cache(%s) failed in %s:%d, %s", self, cachekey, addr, port, errors or "unknown")
    end
    return exists, extrainfo
end

-- push cache file
function remote_cache_client:push(cachekey, cachefile, extrainfo)
    assert(self:is_connected(), "%s: has been not connected!", self)
    local addr = self:addr()
    local port = self:port()
    local sock = assert(self:_sock_open(), "open socket failed!")
    local session_id = self:session_id()
    local errors
    local ok = false
    dprint("%s: push cache(%s) in %s:%d ..", self, cachekey, addr, port)
    local stream = socket_stream(sock, {send_timeout = self:send_timeout(), recv_timeout = self:recv_timeout()})
    if stream:send_msg(message.new_push(session_id, cachekey, {token = self:token(), extrainfo = extrainfo})) and stream:flush() then
        if stream:send_file(cachefile, {compress = os.filesize(cachefile) > 4096}) then
            local msg = stream:recv_msg()
            if msg then
                dprint(msg:body())
                if msg:success() then
                    ok = true
                else
                    errors = msg:errors()
                end
            end
        else
            errors = "send cache file failed"
        end
    end
    self:_sock_close(sock)
    if ok then
        dprint("%s: push cache(%s) ok!", self, cachekey)
    else
        dprint("%s: push cache(%s) failed in %s:%d, %s", self, cachekey, addr, port, errors or "unknown")
    end
end

-- get cache file info
function remote_cache_client:cacheinfo(cachekey)
    assert(self:is_connected(), "%s: has been not connected!", self)
    local addr = self:addr()
    local port = self:port()
    local sock = assert(self:_sock_open(), "open socket failed!")
    local session_id = self:session_id()
    local errors
    local ok = false
    local cacheinfo
    dprint("%s: get cacheinfo(%s) in %s:%d ..", self, cachekey, addr, port)
    local stream = socket_stream(sock, {send_timeout = self:send_timeout(), recv_timeout = self:recv_timeout()})
    if stream:send_msg(message.new_fileinfo(session_id, cachekey, {token = self:token()})) and stream:flush() then
        local msg = stream:recv_msg()
        if msg then
            dprint(msg:body())
            if msg:success() then
                cacheinfo = msg:body().fileinfo
                ok = true
            else
                errors = msg:errors()
            end
        end
    end
    self:_sock_close(sock)
    if ok then
        dprint("%s: get cacheinfo(%s) ok!", self, cachekey)
    else
        dprint("%s: get cacheinfo(%s) failed in %s:%d, %s", self, cachekey, addr, port, errors or "unknown")
    end
    return cacheinfo
end

-- get the exist info of cache in server
function remote_cache_client:existinfo()
    assert(self:is_connected(), "%s: has been not connected!", self)
    local addr = self:addr()
    local port = self:port()
    local sock = assert(self:_sock_open(), "open socket failed!")
    local session_id = self:session_id()
    local errors
    local existinfo
    dprint("%s: get exist info in %s:%d ..", self, addr, port)
    local stream = socket_stream(sock, {send_timeout = self:send_timeout(), recv_timeout = self:recv_timeout()})
    if stream:send_msg(message.new_existinfo(session_id, "objectfiles", {token = self:token()})) and stream:flush() then
        local data = stream:recv_data()
        if data then
            local msg = stream:recv_msg()
            if msg then
                dprint(msg:body())
                if msg:success() then
                    local count = msg:body().count
                    if count and count > 0 then
                        local filter = bloom_filter.new()
                        filter:data_set(data)
                        existinfo = filter
                    end
                else
                    errors = msg:errors()
                end
            end
        else
            errors = "recv exist info failed"
        end
    end
    self:_sock_close(sock)
    if existinfo then
        dprint("%s: get exist info ok!", self)
    else
        dprint("%s: get exist info failed in %s:%d, %s", self, addr, port, errors or "unknown")
    end
    return existinfo
end

-- clean server files
function remote_cache_client:clean()
    assert(self:is_connected(), "%s: has been not connected!", self)
    local addr = self:addr()
    local port = self:port()
    local sock = assert(self:_sock_open(), "open socket failed!")
    local session_id = self:session_id()
    local errors
    local ok = false
    print("%s: clean files in %s:%d ..", self, addr, port)
    local stream = socket_stream(sock, {send_timeout = self:send_timeout(), recv_timeout = self:recv_timeout()})
    if stream:send_msg(message.new_clean(session_id, {token = self:token()})) and stream:flush() then
        local msg = stream:recv_msg()
        if msg then
            vprint(msg:body())
            if msg:success() then
                ok = true
            else
                errors = msg:errors()
            end
        end
    end
    self:_sock_close(sock)
    if ok then
        print("%s: clean files ok!", self)
    else
        print("%s: clean files failed in %s:%d, %s", self, addr, port, errors or "unknown")
    end
end

-- is connected?
function remote_cache_client:is_connected()
    return self:status().connected
end

-- get the status
function remote_cache_client:status()
    local status = self._STATUS
    local statusfile = self:statusfile()
    if not status then
        if os.isfile(statusfile) then
            status = io.load(statusfile)
        end
        status = status or {}
        self._STATUS = status
    end
    return status
end

-- save status
function remote_cache_client:status_save()
    io.save(self:statusfile(), self:status())
end

-- get the status file
function remote_cache_client:statusfile()
    return path.join(self:workdir(), "status.txt")
end

-- get the project directory
function remote_cache_client:projectdir()
    return self._PROJECTDIR
end

-- get working directory
function remote_cache_client:workdir()
    return self._WORKDIR
end

-- get user token
function remote_cache_client:token()
    return self:status().token
end

-- get the session id, only for unique project
function remote_cache_client:session_id()
    return self:status().session_id or hash.uuid(option.get("session")):split("-", {plain = true})[1]:lower()
end

-- set the given client address
function remote_cache_client:address_set(address)
    local addr, port, user = self:address_parse(address)
    self._ADDR = addr
    self._PORT = port
    self._USER = user
end

-- get user name
function remote_cache_client:user()
    return self._USER
end

-- get the ip address
function remote_cache_client:addr()
    return self._ADDR
end

-- get the address port
function remote_cache_client:port()
    return self._PORT
end

-- is server unreachable?
function remote_cache_client:unreachable()
    return self._UNREACHABLE
end

-- open a free socket
function remote_cache_client:_sock_open()
    local freesocks = self._FREESOCKS
    local opensocks = self._OPENSOCKS
    if #freesocks > 0 then
        local sock = freesocks[#freesocks]
        table.remove(freesocks)
        opensocks:insert(sock)
        return sock
    end

    local addr = self:addr()
    local port = self:port()
    local sock = socket.connect(addr, port, {timeout = self:connect_timeout()})
    if not sock then
        self._UNREACHABLE = true
        raise("%s: server unreachable!", self)
    end
    opensocks:insert(sock)
    return sock
end

-- close a socket
function remote_cache_client:_sock_close(sock)
    local freesocks = self._FREESOCKS
    local opensocks = self._OPENSOCKS
    table.insert(freesocks, sock)
    opensocks:remove(sock)
end

function remote_cache_client:__gc()
    local freesocks = self._FREESOCKS
    local opensocks = self._OPENSOCKS
    for _, sock in ipairs(freesocks) do
        sock:close()
    end
    for _, sock in ipairs(opensocks:keys()) do
        sock:close()
    end
    self._FREESOCKS = {}
    self._OPENSOCKS = {}
end

function remote_cache_client:__tostring()
    return "<remote_cache_client>"
end

-- is connected? we cannot depend on client:init when run action
function is_connected()
    local connected = _g.connected
    if connected == nil then
        -- the current process is in service? we cannot enable it
        if os.getenv("XMAKE_IN_SERVICE") then
            connected = false
        end
        if connected == nil then
            local projectdir = os.projectdir()
            local projectfile = os.projectfile()
            if projectfile and os.isfile(projectfile) and projectdir then
                local workdir = path.join(project_config.directory(), "service", "remote_cache")
                local statusfile = path.join(workdir, "status.txt")
                if os.isfile(statusfile) then
                    local status = io.load(statusfile)
                    if status and status.connected then
                        connected = true
                    end
                end
            end
        end
        connected = connected or false
        _g.connected = connected
    end
    return connected
end

-- new a client instance
function new()
    local instance = remote_cache_client()
    instance:init()
    return instance
end

-- get the singleton
function singleton()
    local instance = _g.singleton
    if not instance then
        config.load()
        instance = new()
        _g.singleton = instance
    end
    return instance
end

function main()
    return new()
end