local upload = require "resty.upload"
local uuid = require "resty.jit-uuid"
local cjson = require "cjson"
--# https://github.com/SkyLothar/lua-resty-jwt
--$ opm get SkyLothar/lua-resty-jwt
local jwt = require "resty.jwt"

local chunk_size = 4096
local form = upload:new(chunk_size)
uuid.seed()

TaskTypes = {
    NOOP = 'NOOP',
    UPLOAD_PICTURE = 'UPLOAD_PICTURE'
}

local task_server = ngx.var.task_server
local hty_uc_host = ngx.var.hty_uc_host
local file_dir = ngx.var.tmp_file_dir
local file
local file_name
local files = {}

local http = require "resty.http"
local httpc = http.new()

function cleanupString(str, remove)
    local lcSubStrTab = {}
    while true do
        local lcPos = string.find(str, remove)
        if not lcPos then
            lcSubStrTab[#lcSubStrTab + 1] = str
            break
        end
        local lcSubStr = string.sub(str, 1, lcPos - 1)
        lcSubStrTab[#lcSubStrTab + 1] = lcSubStr
        str = string.sub(str, lcPos + 1, #str)
    end
    local lcMergeStr = ""
    local lci = 1
    while true do
        if lcSubStrTab[lci] then
            lcMergeStr = lcMergeStr .. lcSubStrTab[lci]
            lci = lci + 1
        else
            break
        end
    end
    return lcMergeStr
end

function verifyJwtToken(encrypted_token)

    local http = require "resty.http"
    local httpc = http.new()
    local remote_url = string.format("%s/api/v1/uc/verify_jwt_token", hty_uc_host)

    ngx.log(ngx.INFO, 'htyuc remote_url -> ', remote_url)
    ngx.log(ngx.INFO, 'Authorization -> ', encrypted_token)

    local res, err = httpc:request_uri(
            remote_url,
            {
                method = "POST",
                headers = {
                    ["Host"] = "test.localhost",
                    ["Authorization"] = encrypted_token,
                },
            }
    )

    if not res then
        ngx.status = ngx.HTTP_UNAUTHORIZED
        ngx.header.content_type = "application/json; charset=utf-8"
        ngx.log(ngx.ERR, "Jwt token verify request error ! ")
        ngx.exit(ngx.HTTP_UNAUTHORIZED)
    else
        if 200 ~= res.status then
            ngx.log(ngx.ERR, "Jwt token verify error ! ", err)
            ngx.exit(res.status)
        end
    end

    ngx.log(ngx.INFO, "Jwt token verify ok .")

end

function decodeJwtToken(encrypted_token)

    local jwt_key = "0xCAFEBABE0xCAFEBABE0xCAFEBABE0xCAFEBABE0xCAFEBABE0xCAFEBABE"
    local jwt_obj = jwt:verify(jwt_key, encrypted_token)
    if jwt_obj.verified == false then
        ngx.log(ngx.WARN, "Invalid token: " .. jwt_obj.reason)
        ngx.status = ngx.HTTP_UNAUTHORIZED
        ngx.header.content_type = "application/json; charset=utf-8"
        ngx.say(cjson.encode(jwt_obj))
        ngx.exit(ngx.HTTP_UNAUTHORIZED)
    end

    ngx.log(ngx.INFO, "JWT: " .. cjson.encode(jwt_obj))
    ngx.log(ngx.INFO, "jwt object : payload : sub " .. jwt_obj.payload.sub)

    local htytoken = cjson.decode(jwt_obj.payload.sub)
    ngx.log(ngx.INFO, "htytoken : token_id " .. htytoken.token_id)
    ngx.log(ngx.INFO, "htytoken : hty_id " .. htytoken.hty_id)
    --ngx.log(ngx.INFO, "htytoken : app_id " .. htytoken.app_id)
    ngx.log(ngx.INFO, "htytoken : ts " .. htytoken.ts)
    --ngx.log(ngx.INFO, "htytoken : roles " .. htytoken.roles)

    return htytoken
end

while true do
    local type, res, err = form:read()

    if not type then
        ngx.say("FAILED TO READ *UPLOAD IMAGE* -> ", err)
        return
    end

    local authHeader = ngx.req.get_headers().Authorization
    --
    --if authHeader then
    --    ngx.log(ngx.INFO, 'Check request authorization Authorization -> ', authHeader)
    --    -- local htytoken = DecoderJwtToken(authorization)
    --    --verifyJwtToken(authHeader)
    --else
    --    ngx.log(ngx.ERR, 'Request header no authorization ! ')
    --    ngx.status = 500
    --    ngx.exit(ngx.HTTP_INTERNAL_SERVER_ERROR)
    --end

    --local sudoerToken = ngx.req.get_headers().HtySudoerToken
    --
    --if sudoerToken then
    --    ngx.log(ngx.INFO, 'Check request authorization HtySudoerToken -> ', sudoerToken)
    --    -- local htytoken = DecoderJwtToken(authorization)
    --    --verifyJwtToken(sudoerToken)
    --
    --else
    --    ngx.log(ngx.ERR, 'Request header no hty sudoer token ! ')
    --    ngx.status = 500
    --    ngx.exit(ngx.HTTP_INTERNAL_SERVER_ERROR)
    --end

    if type == "header" then

        --"Content-Disposition","form-data; name=\"files[]\"; filename=\"Song-of-joy.png\""
        --"Content-Type","image\/png"
        local key = res[1]
        local val = res[2]
        if key == "Content-Type" then
            local ext = ngx.re.match(val, [[(\w+)\/(\w+)]], "jo")[2]
            file_name = uuid() .. "." .. ext
        end

        if file_name then
            file = io.open(file_dir .. "/" .. file_name, "w+")
            ngx.log(ngx.INFO, "FILENAME -> ", file_name)
            if not file then
                ngx.say("failed to open file ", file_name)
                return
            end
        end

    elseif type == "body" then
        if file then
            file:write(res)
            -- sha1:update(res)
        end
    elseif type == "part_end" then
        if file then
            file:close()
            table.insert(files, file_name)
        end
        -- 这里要重置一下file_name，否则后面的文件保存时会导致前面已保存的文件变成空文件
        -- file:flush() 和 io.flush() 都没效果
        file_name = nil
        file = nil
    elseif type == "eof" then

        local remote_url = string.format("%s/api/v1/ts/create_task", task_server)

        ngx.log(ngx.INFO, 'remote_url -> ', remote_url)
        ngx.log(ngx.INFO, 'Authorization -> ', ngx.req.get_headers().Authorization)
        ngx.log(ngx.INFO, 'HtySudoerToken -> ', ngx.req.get_headers().HtySudoerToken)

        local body_text = cjson.encode({ task_type = TaskTypes.UPLOAD_PICTURE, data = { images = files } })

        ngx.log(ngx.INFO, 'UPLOAD_PICTURE *body_text* ->', body_text)
        local res, err = httpc:request_uri(
                remote_url,
                {
                    method = "POST",
                    headers = {
                        ["Content-Type"] = "application/json",
                        ["Authorization"] = ngx.req.get_headers().Authorization,
                        ["HtySudoerToken"] = ngx.req.get_headers().HtySudoerToken
                    },
                    body = body_text,
                }
        )
        if 201 ~= res.status then
            ngx.log(ngx.ERR, "TASK CREATE *FAILED*", err)
            ngx.say(err)
            ngx.exit(res.status)
        end
        ngx.say(res.body)
        break
    else
        -- do nothing
    end
end