// Copyright 2014 Team 254. All Rights Reserved.
// Author: pat@patfairbank.com (Patrick Fairbank)
//
// Web routes for configuring the team list.

package main

import (
	"bytes"
	"fmt"
	"github.com/dchest/uniuri"
	"github.com/gorilla/mux"
	"html/template"
	"net/http"
	"strconv"
	"strings"
	"time"
)

const wpaKeyLength = 8

var officialTeamInfoUrl = "http://www.thebluealliance.com/api/v2/team/"

// Shows the team list.
func TeamsGetHandler(w http.ResponseWriter, r *http.Request) {
	renderTeams(w, r, false)
}

// Adds teams to the team list.
func TeamsPostHandler(w http.ResponseWriter, r *http.Request) {
	if !canModifyTeamList() {
		renderTeams(w, r, true)
		return
	}

	var teamNumbers []int
	for _, teamNumberString := range strings.Split(r.PostFormValue("teamNumbers"), "\r\n") {
		teamNumber, err := strconv.Atoi(teamNumberString)
		if err == nil {
			teamNumbers = append(teamNumbers, teamNumber)
		}
	}

	for _, teamNumber := range teamNumbers {
		team, err := getOfficialTeamInfo(teamNumber)
		if err != nil {
			handleWebErr(w, err)
			return
		}
		err = db.CreateTeam(team)
		if err != nil {
			handleWebErr(w, err)
			return
		}
	}
	http.Redirect(w, r, "/setup/teams", 302)
}

// Clears the team list.
func TeamsClearHandler(w http.ResponseWriter, r *http.Request) {
	if !canModifyTeamList() {
		renderTeams(w, r, true)
		return
	}

	err := db.TruncateTeams()
	if err != nil {
		handleWebErr(w, err)
		return
	}
	http.Redirect(w, r, "/setup/teams", 302)
}

// Shows the page to edit a team's fields.
func TeamEditGetHandler(w http.ResponseWriter, r *http.Request) {
	vars := mux.Vars(r)
	teamId, _ := strconv.Atoi(vars["id"])
	team, err := db.GetTeamById(teamId)
	if err != nil {
		handleWebErr(w, err)
		return
	}
	if team == nil {
		http.Error(w, fmt.Sprintf("Error: No such team: %d", teamId), 400)
		return
	}

	template, err := template.ParseFiles("templates/edit_team.html", "templates/base.html")
	if err != nil {
		handleWebErr(w, err)
		return
	}
	data := struct {
		*EventSettings
		*Team
	}{eventSettings, team}
	err = template.ExecuteTemplate(w, "base", data)
	if err != nil {
		handleWebErr(w, err)
		return
	}
}

// Updates a team's fields.
func TeamEditPostHandler(w http.ResponseWriter, r *http.Request) {
	vars := mux.Vars(r)
	teamId, _ := strconv.Atoi(vars["id"])
	team, err := db.GetTeamById(teamId)
	if err != nil {
		handleWebErr(w, err)
		return
	}
	if team == nil {
		http.Error(w, fmt.Sprintf("Error: No such team: %d", teamId), 400)
		return
	}

	team.Name = r.PostFormValue("name")
	team.Nickname = r.PostFormValue("nickname")
	team.City = r.PostFormValue("city")
	team.StateProv = r.PostFormValue("stateProv")
	team.Country = r.PostFormValue("country")
	team.RookieYear, _ = strconv.Atoi(r.PostFormValue("rookieYear"))
	team.RobotName = r.PostFormValue("robotName")
	team.Accomplishments = r.PostFormValue("accomplishments")
	if eventSettings.NetworkSecurityEnabled {
		team.WpaKey = r.PostFormValue("wpaKey")
		if len(team.WpaKey) < 8 || len(team.WpaKey) > 63 {
			handleWebErr(w, fmt.Errorf("WPA key must be between 8 and 63 characters."))
			return
		}
	}
	err = db.SaveTeam(team)
	if err != nil {
		handleWebErr(w, err)
		return
	}
	http.Redirect(w, r, "/setup/teams", 302)
}

// Removes a team from the team list.
func TeamDeletePostHandler(w http.ResponseWriter, r *http.Request) {
	if !canModifyTeamList() {
		renderTeams(w, r, true)
		return
	}

	vars := mux.Vars(r)
	teamId, _ := strconv.Atoi(vars["id"])
	team, err := db.GetTeamById(teamId)
	if err != nil {
		handleWebErr(w, err)
		return
	}
	if team == nil {
		http.Error(w, fmt.Sprintf("Error: No such team: %d", teamId), 400)
		return
	}
	err = db.DeleteTeam(team)
	if err != nil {
		handleWebErr(w, err)
		return
	}
	http.Redirect(w, r, "/setup/teams", 302)
}

// Publishes the team list to the web.
func TeamsPublishHandler(w http.ResponseWriter, r *http.Request) {
	err := PublishTeams()
	if err != nil {
		http.Error(w, "Failed to publish teams: "+err.Error(), 500)
		return
	}
	http.Redirect(w, r, "/setup/teams", 302)
}

// Generates random WPA keys and saves them to the team models.
func TeamsGenerateWpaKeysHandler(w http.ResponseWriter, r *http.Request) {
	generateAllKeys := false
	if all, ok := r.URL.Query()["all"]; ok {
		generateAllKeys = all[0] == "true"
	}

	teams, err := db.GetAllTeams()
	if err != nil {
		handleWebErr(w, err)
		return
	}
	for _, team := range teams {
		if len(team.WpaKey) == 0 || generateAllKeys {
			team.WpaKey = uniuri.NewLen(wpaKeyLength)
			db.SaveTeam(&team)
		}
	}

	http.Redirect(w, r, "/setup/teams", 302)
}

func renderTeams(w http.ResponseWriter, r *http.Request, showErrorMessage bool) {
	teams, err := db.GetAllTeams()
	if err != nil {
		handleWebErr(w, err)
		return
	}

	template, err := template.ParseFiles("templates/setup_teams.html", "templates/base.html")
	if err != nil {
		handleWebErr(w, err)
		return
	}
	data := struct {
		*EventSettings
		Teams            []Team
		ShowErrorMessage bool
	}{eventSettings, teams, showErrorMessage}
	err = template.ExecuteTemplate(w, "base", data)
	if err != nil {
		handleWebErr(w, err)
		return
	}
}

// Returns true if it is safe to change the team list (i.e. no matches/results exist yet).
func canModifyTeamList() bool {
	matches, err := db.GetMatchesByType("qualification")
	if err != nil || len(matches) > 0 {
		return false
	}
	return true
}

// Returns the data for the given team number.
func getOfficialTeamInfo(teamId int) (*Team, error) {
	// Create the team variable that stores the result
	var team Team

	// If team info download is enabled, download the current teams data (caching isn't easy with the new paging system in the api)
	if eventSettings.TBADownloadEnabled {
		var tbaTeam *TbaTeam = getTeamFromTba(teamId)

		// Check if the result is valid.  If a team is not found, just return a basic team
		if tbaTeam == nil {
			team = Team{Id: teamId}
			return &team, nil
		}

		var recentAwards []TbaAward
		if eventSettings.TBAAwardsDownloadEnabled {
			recentAwards = getTeamAwardsFromTba(teamId)
		}

		var accomplishmentsBuffer bytes.Buffer

		// Generate accomplishments string
		for _, award := range recentAwards {
			if time.Now().Year()-award.Year <= 2 {
				accomplishmentsBuffer.WriteString(fmt.Sprint(award.Year, " - ", award.Name, "\n"))
			}
		}

		// Use those variables to make a team object
		team = Team{Id: teamId, Name: tbaTeam.Name, Nickname: tbaTeam.Nickname,
			City: tbaTeam.Locality, StateProv: tbaTeam.Reigon,
			Country: tbaTeam.Country, RookieYear: tbaTeam.RookieYear, Accomplishments: accomplishmentsBuffer.String()}
	} else {
		// If team grab is disabled, just use the team number
		team = Team{Id: teamId}
	}

	// Return the team object
	return &team, nil
}