/*
 * Copyright (C) 2017-2018 "IoT.bzh"
 * Author Sebastien Douheret <sebastien@iot.bzh>
 *
 * 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.
 *
 */

package main

import (
	"encoding/json"
	"fmt"
	"os"
	"sort"
	"strconv"
	"strings"

	"gerrit.automotivelinux.org/gerrit/src/xds/xds-agent.git/lib/xaapiv1"
	"github.com/franciscocpg/reflectme"
	"github.com/urfave/cli"
)

var cacheXdsVersion *xaapiv1.XDSVersion
var cacheData = xaapiv1.XDSVersion{}

// XdsVersionGet Get version of XDS agent & server
func XdsVersionGet(ver *xaapiv1.XDSVersion) error {
	// Update cached data
	if cacheXdsVersion == nil {
		if err := HTTPCli.Get("/version", &cacheData); err != nil {
			return err
		}
	}
	reflectme.Copy(&cacheData, ver)
	return nil
}

// XdsConfigGet Get current XDS Agent config
func XdsConfigGet(cfg *xaapiv1.APIConfig) error {
	return HTTPCli.Get("/config", cfg)
}

// XdsConfigSet Set XDS Agent config
func XdsConfigSet(cfg xaapiv1.APIConfig) error {
	// clear cache
	cacheXdsVersion = nil

	newCfg := xaapiv1.APIConfig{}
	if err := HTTPCli.Post("/config", cfg, &newCfg); err != nil {
		return err
	}

	idx := XdsServerIndexGet()
	if !newCfg.Servers[idx].Connected {
		return fmt.Errorf("XDS server %s still not connected", cfg.Servers[idx].URL)
	}

	return nil
}

// XdsServerIDGet returns the XDS Server ID
func XdsServerIDGet() string {
	ver := xaapiv1.XDSVersion{}
	if err := XdsVersionGet(&ver); err != nil {
		return ""
	}
	if len(ver.Server) < 1 {
		return ""
	}
	return ver.Server[XdsServerIndexGet()].ID
}

// XdsServerIndexGet returns the index number of XDS Server
func XdsServerIndexGet() int {
	// FIXME support multiple server
	return 0
}

// XdsServerComputeURL computes the URL used to access to XDS Server API
func XdsServerComputeURL(endURL string) string {
	return "servers/" + strconv.Itoa(XdsServerIndexGet()) + endURL
}

// Sort projects by Label
type _PrjByLabel []xaapiv1.ProjectConfig

func (s _PrjByLabel) Len() int           { return len(s) }
func (s _PrjByLabel) Swap(i, j int)      { s[i], s[j] = s[j], s[i] }
func (s _PrjByLabel) Less(i, j int) bool { return s[i].Label < s[j].Label }

// ProjectsListGet Get the list of existing projects
func ProjectsListGet(prjs *[]xaapiv1.ProjectConfig) error {
	var data []byte
	if err := HTTPCli.HTTPGet("/projects", &data); err != nil {
		return err
	}
	Log.Debugf("Result of /projects: %v", string(data[:]))

	if err := json.Unmarshal(data, &prjs); err != nil {
		return err
	}

	sort.Sort(_PrjByLabel(*prjs))

	return nil
}

// LogPost Helper to log a POST request
func LogPost(format string, data interface{}) {
	b, _ := json.Marshal(data)
	Log.Infof(format, string(b))
}

// GetID Return a string ID set with --id option or as simple parameter
func GetID(ctx *cli.Context, idEnvVarName string) string {
	return GetIDName(ctx, "id", idEnvVarName)
}

// GetIDName Return a string ID set with --XXX option or as simple parameter
func GetIDName(ctx *cli.Context, idName, idEnvVarName string) string {
	if idName == "" {
		return ""
	}

	// Get id set using option --id
	id := ctx.String(idName)

	// Check if id has been set using env variable
	envSdkid, _ := os.LookupEnv(idEnvVarName)

	// Support as 1st arg without --id option string (for example xds-cli sdk install 123456)
	idArgs := ctx.Args().First()

	// Set or overwrite id using first arg (knowing that 1st is overwrite env variable)
	if (id == "" && idArgs != "") || (envSdkid != "" && idArgs != "") {
		id = idArgs
	}
	return id
}

// Confirm Return true when user answer 'y' or 'yes' to a question
func Confirm(question string) bool {
	var answer string
	fmt.Print(question)
	fmt.Scanln(&answer)
	ans := strings.ToLower(strings.TrimSpace(answer))
	return (ans == "y" || ans == "yes")
}

// compareID Compare an ID to a reference ID
func compareID(refID, ID string) bool {
	return refID != "" && ID != "" && strings.HasPrefix(refID, ID)
}