// Copyright (c) 2015 Spinpunch, Inc. All Rights Reserved.
// See License.txt for license information.

package api

import (
	"bufio"
	"net/http"
	"os"
	"strings"

	l4g "code.google.com/p/log4go"
	"github.com/gorilla/mux"

	"github.com/mattermost/platform/model"
	"github.com/mattermost/platform/utils"
)

func InitAdmin(r *mux.Router) {
	l4g.Debug("Initializing admin api routes")

	sr := r.PathPrefix("/admin").Subrouter()
	sr.Handle("/logs", ApiUserRequired(getLogs)).Methods("GET")
	sr.Handle("/config", ApiUserRequired(getConfig)).Methods("GET")
	sr.Handle("/save_config", ApiUserRequired(saveConfig)).Methods("POST")
	sr.Handle("/client_props", ApiAppHandler(getClientProperties)).Methods("GET")
	sr.Handle("/test_email", ApiUserRequired(testEmail)).Methods("POST")
}

func getLogs(c *Context, w http.ResponseWriter, r *http.Request) {

	if !c.HasSystemAdminPermissions("getLogs") {
		return
	}

	var lines []string

	if utils.Cfg.LogSettings.EnableFile {

		file, err := os.Open(utils.GetLogFileLocation(utils.Cfg.LogSettings.FileLocation))
		if err != nil {
			c.Err = model.NewAppError("getLogs", "Error reading log file", err.Error())
		}

		defer file.Close()

		scanner := bufio.NewScanner(file)
		for scanner.Scan() {
			lines = append(lines, scanner.Text())
		}
	} else {
		lines = append(lines, "")
	}

	w.Write([]byte(model.ArrayToJson(lines)))
}

func getClientProperties(c *Context, w http.ResponseWriter, r *http.Request) {
	w.Write([]byte(model.MapToJson(utils.ClientProperties)))
}

func getConfig(c *Context, w http.ResponseWriter, r *http.Request) {
	if !c.HasSystemAdminPermissions("getConfig") {
		return
	}

	json := utils.Cfg.ToJson()
	cfg := model.ConfigFromJson(strings.NewReader(json))
	json = cfg.ToJson()

	w.Write([]byte(json))
}

func saveConfig(c *Context, w http.ResponseWriter, r *http.Request) {
	if !c.HasSystemAdminPermissions("getConfig") {
		return
	}

	cfg := model.ConfigFromJson(r.Body)
	if cfg == nil {
		c.SetInvalidParam("saveConfig", "config")
		return
	}

	if len(cfg.ServiceSettings.ListenAddress) == 0 {
		c.SetInvalidParam("saveConfig", "config")
		return
	}

	if cfg.TeamSettings.MaxUsersPerTeam == 0 {
		c.SetInvalidParam("saveConfig", "config")
		return
	}

	// TODO run some cleanup validators

	utils.SaveConfig(utils.CfgFileName, cfg)
	utils.LoadConfig(utils.CfgFileName)
	json := utils.Cfg.ToJson()
	w.Write([]byte(json))
}

func testEmail(c *Context, w http.ResponseWriter, r *http.Request) {
	if !c.HasSystemAdminPermissions("testEmail") {
		return
	}

	cfg := model.ConfigFromJson(r.Body)
	if cfg == nil {
		c.SetInvalidParam("testEmail", "config")
		return
	}

	if result := <-Srv.Store.User().Get(c.Session.UserId); result.Err != nil {
		c.Err = result.Err
		return
	} else {
		if err := utils.SendMailUsingConfig(result.Data.(*model.User).Email, "Mattermost - Testing Email Settings", "<br/><br/><br/>It appears your Mattermost email is setup correctly!", cfg); err != nil {
			c.Err = err
			return
		}
	}

	m := make(map[string]string)
	m["SUCCESS"] = "true"
	w.Write([]byte(model.MapToJson(m)))
}