-- 指定模块引用目录，否则无法加载同目录下的其他文件
--package.path = package.path .. ';/usr/local/opt/openresty/nginx/scripts/?.lua';
package.path = package.path .. ';<SCRIPT_PATH>/?.lua';

local _M = {}

function _M.upyun_download(httpc, cjson, Upt, pl, uri)

    ngx.log(ngx.INFO, "UPYUN DOWNLOAD : URI -> " .. uri)

    local upt = Upt.upt(uri)
    ngx.log(ngx.INFO, "UPYUN DOWNLOAD : UPT -> " .. upt)

    local remote_url = ngx.var.upyun_domain .. uri .. "?_upt=" .. upt
    ngx.log(ngx.INFO, "UPYUN DOWNLOAD : REMOTE_URL -> " .. remote_url)

--     ngx.log(ngx.INFO, "REQUEST UPYUN DOWNLOAD : HTTPC -> " .. pl.write(httpc))

    local no_exception, resp, resp_err = pcall(httpc.request_uri, httpc, remote_url,
            {
                ssl_verify = false, -- 设置参数 ssl_verify 为false 不校验ssl证书
                method = "GET",
            })

    ngx.log(ngx.INFO, "RESP -> ", pl.write(resp))
    if no_exception == true then
        if 200 ~= resp.status then
            ngx.log(ngx.ERR, "UPYUN DOWNLOAD *FAILED*", pl.write(resp_err))
            ngx.status = resp.status
--             ngx.say(pl.write(resp_err))
            ngx.say(cjson.encode({r = false, d = nil, e = resp_err}))
            ngx.exit(resp.status)
        else
            ngx.log(ngx.ERR, "RESP IS OK -> ", pl.write(resp.body))
            -- return cjson.decode(resp.body).d
        end
    else
        if resp == nil then
            resp = ""
        end
        ngx.log(ngx.ERR, "FAILED TO CONNECT TO *UPYUN*: httpc throws runtime error, please check log. / ", pl.write(resp))
        ngx.status = resp.status
        ngx.say(cjson.encode({r = false, d = nil, e = resp.status}))
        ngx.exit(resp.status)
    end


    -- TODO: send resp.body to Flask API (ai-api) -> convert_mxml_to_xml() -> XML string
    -- local xml = ai-api.convert_mxml_to_xml(resp.body)
    -- ngx.log(xml)

    ngx.log(ngx.INFO, "RESP -> ", pl.write(resp))
    -- save the content to a file
    local f = assert(io.open('/tmp/test.jpg', 'wb')) -- open in "binary" mode
    f:write(resp.body)
    f:close()

    ngx.say(cjson.encode({r = true, d = "/tmp/test.jpg", e = nil}))
    ngx.exit(resp.status)
end

return _M