-- 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 upyun_upload = {}

local json = require("cjson")


local strip_path = require("lib.strip_path")
local Upyun = require('lib.upyun')

--- @return string|nil public_url 成功返回又拍完整 URL；失败返回 nil（已打日志）
function upyun_upload.upload_return_url(filepath, filename, retry)
    if retry == nil then
        retry = 1
    end

    if retry > 3 then
        ngx.log(ngx.ERR, "failed to upload file : reach max retries")
        return nil
    end

    local upyun, err = Upyun:new({
        user = ngx.var.upyun_operator,
        passwd = ngx.var.upyun_password,
        localFilePath = filepath
    })

    if not upyun then
        ngx.status = 500
        ngx.log(ngx.ERR, "failed to initialize upyun: " .. err)
        return nil
    end

    local bucket = ngx.var.upyun_bucket
    local directory = ngx.var.upyun_directory
    if not filename then
        filename = strip_path.strip_path(filepath)
    end

    ngx.log(ngx.INFO, 'bucket -> ', bucket)
    ngx.log(ngx.INFO, 'directory -> ', directory)

    local savePath = bucket .. "/" .. directory .. "/" .. filename
    ngx.log(ngx.INFO, " savePath " , savePath)

    local options = {
        md5 = true
    }

    local info, upl_err = upyun:upload_file(savePath, nil, options)
    if not info then
        local error_table = json.decode(upl_err)
        ngx.log(ngx.INFO, "Upyun Upload File Error: " .. upl_err)
        ngx.log(ngx.ERR, '[' .. error_table["code"] .. ']')

        if (error_table["code"] == 40000006)
        then
            ngx.status = 400
            ngx.log(ngx.ERR, "Retry upload file : " .. '[' .. upl_err .. ']')
            return upyun_upload.upload_return_url(filepath, filename, retry + 1)
        else
            ngx.status = 400
            ngx.log(ngx.ERR, "failed to upload file : " .. '[' .. upl_err .. ']')
            return nil
        end
    end

    ngx.status = 200
    local fullpath = ngx.var.upyun_domain .. "/" .. directory .. "/" .. filename
    ngx.log(ngx.INFO, "SUCCESS UPLOAD -> UPYUN URL -> ", fullpath)
    return fullpath
end

function upyun_upload.upload(filepath, filename, retry)
    local url = upyun_upload.upload_return_url(filepath, filename, retry)
    if url then
        ngx.say(url)
    end
end

return upyun_upload