package api

import (
	"encoding/json"
	"s-ui/database"
	"s-ui/logger"
	"s-ui/service"
	"s-ui/util"
	"s-ui/util/common"
	"strconv"
	"strings"
	"time"

	"github.com/gin-gonic/gin"
)

type APIHandler struct {
	service.SettingService
	service.UserService
	service.ConfigService
	service.ClientService
	service.TlsService
	service.InboundService
	service.OutboundService
	service.EndpointService
	service.PanelService
	service.StatsService
	service.ServerService
}

func NewAPIHandler(g *gin.RouterGroup) {
	a := &APIHandler{}
	a.initRouter(g)
}

func (a *APIHandler) initRouter(g *gin.RouterGroup) {
	g.Use(func(c *gin.Context) {
		path := c.Request.URL.Path
		if !strings.HasSuffix(path, "login") && !strings.HasSuffix(path, "logout") {
			checkLogin(c)
		}
	})

	g.POST("/:postAction", a.postHandler)
	g.GET("/:getAction", a.getHandler)
}

func (a *APIHandler) postHandler(c *gin.Context) {
	var err error
	action := c.Param("postAction")
	remoteIP := getRemoteIp(c)
	loginUser := GetLoginUser(c)
	hostname := getHostname(c)

	switch action {
	case "login":
		loginUser, err := a.UserService.Login(c.Request.FormValue("user"), c.Request.FormValue("pass"), remoteIP)
		if err != nil {
			jsonMsg(c, "", err)
			return
		}

		sessionMaxAge, err := a.SettingService.GetSessionMaxAge()
		if err != nil {
			logger.Infof("Unable to get session's max age from DB")
		}

		err = SetLoginUser(c, loginUser, sessionMaxAge)
		if err == nil {
			logger.Info("user ", loginUser, " login success")
		} else {
			logger.Warning("login failed: ", err)
		}

		jsonMsg(c, "", nil)
	case "changePass":
		id := c.Request.FormValue("id")
		oldPass := c.Request.FormValue("oldPass")
		newUsername := c.Request.FormValue("newUsername")
		newPass := c.Request.FormValue("newPass")
		err = a.UserService.ChangePass(id, oldPass, newUsername, newPass)
		if err == nil {
			logger.Info("change user credentials success")
			jsonMsg(c, "save", nil)
		} else {
			logger.Warning("change user credentials failed:", err)
			jsonMsg(c, "", err)
		}
	case "save":
		obj := c.Request.FormValue("object")
		act := c.Request.FormValue("action")
		data := c.Request.FormValue("data")
		initUsers := c.Request.FormValue("initUsers")
		objs, err := a.ConfigService.Save(obj, act, json.RawMessage(data), initUsers, loginUser, hostname)
		if err != nil {
			jsonMsg(c, "save", err)
			return
		}
		err = a.loadPartialData(c, objs)
		if err != nil {
			jsonMsg(c, obj, err)
		}
		return
	case "restartApp":
		err = a.PanelService.RestartPanel(3)
		jsonMsg(c, "restartApp", err)
	case "restartSb":
		err = a.ConfigService.RestartCore()
		jsonMsg(c, "restartSb", err)
	case "linkConvert":
		link := c.Request.FormValue("link")
		result, _, err := util.GetOutbound(link, 0)
		jsonObj(c, result, err)
	case "importdb":
		file, _, err := c.Request.FormFile("db")
		if err != nil {
			jsonMsg(c, "", err)
			return
		}
		defer file.Close()
		err = database.ImportDB(file)
		jsonMsg(c, "", err)
	default:
		jsonMsg(c, "failed", common.NewError("unknown action: ", action))
	}
}

func (a *APIHandler) getHandler(c *gin.Context) {
	action := c.Param("getAction")

	switch action {
	case "logout":
		loginUser := GetLoginUser(c)
		if loginUser != "" {
			logger.Infof("user %s logout", loginUser)
		}
		ClearSession(c)
		jsonMsg(c, "", nil)
	case "load":
		data, err := a.loadData(c)
		if err != nil {
			jsonMsg(c, "", err)
			return
		}
		jsonObj(c, data, nil)
	case "inbounds", "outbounds", "endpoints", "tls", "clients", "config":
		err := a.loadPartialData(c, []string{action})
		if err != nil {
			jsonMsg(c, action, err)
		}
		return
	case "users":
		users, err := a.UserService.GetUsers()
		if err != nil {
			jsonMsg(c, "", err)
			return
		}
		jsonObj(c, *users, nil)
	case "settings":
		data, err := a.SettingService.GetAllSetting()
		if err != nil {
			jsonMsg(c, "", err)
			return
		}
		jsonObj(c, data, err)
	case "stats":
		resource := c.Query("resource")
		tag := c.Query("tag")
		limit, err := strconv.Atoi(c.Query("limit"))
		if err != nil {
			limit = 100
		}
		data, err := a.StatsService.GetStats(resource, tag, limit)
		if err != nil {
			jsonMsg(c, "", err)
			return
		}
		jsonObj(c, data, err)
	case "status":
		request := c.Query("r")
		result := a.ServerService.GetStatus(request)
		jsonObj(c, result, nil)
	case "onlines":
		onlines, err := a.StatsService.GetOnlines()
		jsonObj(c, onlines, err)
	case "logs":
		count := c.Query("c")
		level := c.Query("l")
		logs := a.ServerService.GetLogs(count, level)
		jsonObj(c, logs, nil)
	case "changes":
		actor := c.Query("a")
		chngKey := c.Query("k")
		count := c.Query("c")
		changes := a.ConfigService.GetChanges(actor, chngKey, count)
		jsonObj(c, changes, nil)
	case "keypairs":
		kType := c.Query("k")
		options := c.Query("o")
		keypair := a.ServerService.GenKeypair(kType, options)
		jsonObj(c, keypair, nil)
	case "getdb":
		exclude := c.Query("exclude")
		db, err := database.GetDb(exclude)
		if err != nil {
			jsonMsg(c, "", err)
			return
		}
		c.Header("Content-Type", "application/octet-stream")
		c.Header("Content-Disposition", "attachment; filename=s-ui_"+time.Now().Format("20060102-150405")+".db")
		c.Writer.Write(db)
	default:
		jsonMsg(c, "failed", common.NewError("unknown action: ", action))
	}
}

func (a *APIHandler) loadData(c *gin.Context) (interface{}, error) {
	data := make(map[string]interface{}, 0)
	lu := c.Query("lu")
	isUpdated, err := a.ConfigService.CheckChanges(lu)
	if err != nil {
		return "", err
	}
	onlines, err := a.StatsService.GetOnlines()

	sysInfo := a.ServerService.GetSingboxInfo()
	if sysInfo["running"] == false {
		logs := a.ServerService.GetLogs("1", "debug")
		if len(logs) > 0 {
			data["lastLog"] = logs[0]
		}
	}

	if err != nil {
		return "", err
	}
	if isUpdated {
		config, err := a.SettingService.GetConfig()
		if err != nil {
			return "", err
		}
		clients, err := a.ClientService.GetAll()
		if err != nil {
			return "", err
		}
		tlsConfigs, err := a.TlsService.GetAll()
		if err != nil {
			return "", err
		}
		inbounds, err := a.InboundService.GetAll()
		if err != nil {
			return "", err
		}
		outbounds, err := a.OutboundService.GetAll()
		if err != nil {
			return "", err
		}
		endpoints, err := a.EndpointService.GetAll()
		if err != nil {
			return "", err
		}
		subURI, err := a.SettingService.GetFinalSubURI(strings.Split(c.Request.Host, ":")[0])
		if err != nil {
			return "", err
		}
		data["config"] = json.RawMessage(config)
		data["clients"] = clients
		data["tls"] = tlsConfigs
		data["inbounds"] = inbounds
		data["outbounds"] = outbounds
		data["endpoints"] = endpoints
		data["subURI"] = subURI
		data["onlines"] = onlines
	} else {
		data["onlines"] = onlines
	}

	return data, nil
}

func (a *APIHandler) loadPartialData(c *gin.Context, objs []string) error {
	data := make(map[string]interface{}, 0)
	id := c.Query("id")

	for _, obj := range objs {
		switch obj {
		case "inbounds":
			inbounds, err := a.InboundService.Get(id)
			if err != nil {
				return err
			}
			data[obj] = inbounds
		case "outbounds":
			outbounds, err := a.OutboundService.GetAll()
			if err != nil {
				return err
			}
			data[obj] = outbounds
		case "endpoints":
			endpoints, err := a.EndpointService.GetAll()
			if err != nil {
				return err
			}
			data[obj] = endpoints
		case "tls":
			tlsConfigs, err := a.TlsService.GetAll()
			if err != nil {
				return err
			}
			data[obj] = tlsConfigs
		case "clients":
			clients, err := a.ClientService.Get(id)
			if err != nil {
				return err
			}
			data[obj] = clients
		case "config":
			config, err := a.SettingService.GetConfig()
			if err != nil {
				return err
			}
			data[obj] = json.RawMessage(config)
		case "settings":
			settings, err := a.SettingService.GetAllSetting()
			if err != nil {
				return err
			}
			data[obj] = settings
		}
	}

	jsonObj(c, data, nil)
	return nil
}

func (a *APIHandler) postActions(c *gin.Context) (string, json.RawMessage, error) {
	var data map[string]json.RawMessage
	err := c.ShouldBind(&data)
	if err != nil {
		return "", nil, err
	}
	return string(data["action"]), data["data"], nil
}