package main

import (
	//"fmt"
	"strings"
	"strconv"
	"net"
	"net/http"
	"html/template"

	"golang.org/x/crypto/bcrypt"
)

var guest_user User = User{ID:0,Link:"#",Group:6,Perms:GuestPerms}

var PreRoute func(http.ResponseWriter, *http.Request) (User,bool) = _pre_route
var PanelSessionCheck func(http.ResponseWriter, *http.Request, *User) (HeaderVars,PanelStats,bool) = _panel_session_check
var SimplePanelSessionCheck func(http.ResponseWriter, *http.Request, *User) bool = _simple_panel_session_check
var SimpleForumSessionCheck func(w http.ResponseWriter, r *http.Request, user *User, fid int) (success bool) = _simple_forum_session_check
var ForumSessionCheck func(w http.ResponseWriter, r *http.Request, user *User, fid int) (headerVars HeaderVars, success bool) = _forum_session_check
var SessionCheck func(w http.ResponseWriter, r *http.Request, user *User) (headerVars HeaderVars, success bool) = _session_check

var CheckPassword func(real_password string, password string, salt string) (err error) = BcryptCheckPassword
var GeneratePassword func(password string) (hashed_password string, salt string, err error) = BcryptGeneratePassword

type User struct
{
	ID int
	Link string
	Name string
	Email string
	Group int
	Active bool
	Is_Mod bool
	Is_Super_Mod bool
	Is_Admin bool
	Is_Super_Admin bool
	Is_Banned bool
	Perms Perms
	PluginPerms map[string]bool
	Session string
	Loggedin bool
	Avatar string
	Message string
	URLPrefix string // Move this to another table? Create a user lite?
	URLName string
	Tag string
	Level int
	Score int
	Last_IP string
}

type Email struct
{
	UserID int
	Email string
	Validated bool
	Primary bool
	Token string
}

func BcryptCheckPassword(real_password string, password string, salt string) (err error) {
	return bcrypt.CompareHashAndPassword([]byte(real_password), []byte(password + salt))
}

// Investigate. Do we need the extra salt?
func BcryptGeneratePassword(password string) (hashed_password string, salt string, err error) {
	salt, err = GenerateSafeString(saltLength)
	if err != nil {
		return "", "", err
	}

	password = password + salt
	hashed_password, err = BcryptGeneratePasswordNoSalt(password)
	if err != nil {
		return "", "", err
	}
	return hashed_password, salt, nil
}

func BcryptGeneratePasswordNoSalt(password string) (hash string, err error) {
	hashed_password, err := bcrypt.GenerateFromPassword([]byte(password), bcrypt.DefaultCost)
	if err != nil {
		return "", err
	}
	return string(hashed_password), nil
}

func SetPassword(uid int, password string) error {
	hashed_password, salt, err := GeneratePassword(password)
	if err != nil {
		return err
	}
	_, err = set_password_stmt.Exec(hashed_password, salt, uid)
	if err != nil {
		return err
	}
	return nil
}

func SendValidationEmail(username string, email string, token string) bool {
	var schema string = "http"
	if site.EnableSsl {
		schema += "s"
	}

	subject := "Validate Your Email @ " + site.Name
	msg := "Dear " + username + ", following your registration on our forums, we ask you to validate your email, so that we can confirm that this email actually belongs to you.\n\nClick on the following link to do so. " + schema + "://" + site.Url + "/user/edit/token/" + token + "\n\nIf you haven't created an account here, then please feel free to ignore this email.\nWe're sorry for the inconvenience this may have caused."
	return SendEmail(email, subject, msg)
}

// TO-DO: Support for left sidebars and sidebars on both sides
// http.Request is for context.Context middleware. Mostly for plugin_socialgroups right now
func BuildWidgets(zone string, data interface{}, headerVars *HeaderVars, r *http.Request) {
	if vhooks["intercept_build_widgets"] != nil {
		if run_vhook("intercept_build_widgets", zone, data, headerVars, r).(bool) {
			return
		}
	}

	//log.Print("themes[defaultTheme].Sidebars",themes[defaultTheme].Sidebars)
	if themes[defaultTheme].Sidebars == "right" {
			if len(docks.RightSidebar) != 0 {
				var sbody string
				for _, widget := range docks.RightSidebar {
					if widget.Enabled {
						if widget.Location == "global" || widget.Location == zone {
							sbody += widget.Body
						}
					}
				}
				headerVars.Widgets.RightSidebar = template.HTML(sbody)
			}
	}
}

func _simple_forum_session_check(w http.ResponseWriter, r *http.Request, user *User, fid int) (success bool) {
	if !fstore.Exists(fid) {
		PreError("The target forum doesn't exist.",w,r)
		return false
	}
	success = true

	// Is there a better way of doing the skip AND the success flag on this hook like multiple returns?
	if vhooks["simple_forum_check_pre_perms"] != nil {
		if run_vhook("simple_forum_check_pre_perms", w, r, user, &fid, &success).(bool) {
			return success
		}
	}

	fperms := groups[user.Group].Forums[fid]
	if fperms.Overrides && !user.Is_Super_Admin {
		user.Perms.ViewTopic = fperms.ViewTopic
		user.Perms.LikeItem = fperms.LikeItem
		user.Perms.CreateTopic = fperms.CreateTopic
		user.Perms.EditTopic = fperms.EditTopic
		user.Perms.DeleteTopic = fperms.DeleteTopic
		user.Perms.CreateReply = fperms.CreateReply
		user.Perms.EditReply = fperms.EditReply
		user.Perms.DeleteReply = fperms.DeleteReply
		user.Perms.PinTopic = fperms.PinTopic
		user.Perms.CloseTopic = fperms.CloseTopic

		if len(fperms.ExtData) != 0 {
			for name, perm := range fperms.ExtData {
				user.PluginPerms[name] = perm
			}
		}
	}
	return true
}

func _forum_session_check(w http.ResponseWriter, r *http.Request, user *User, fid int) (headerVars HeaderVars, success bool) {
	headerVars, success = SessionCheck(w,r,user)
	if !fstore.Exists(fid) {
		NotFound(w,r)
		return headerVars, false
	}

	if vhooks["forum_check_pre_perms"] != nil {
		if run_vhook("forum_check_pre_perms", w, r, user, &fid, &success, &headerVars).(bool) {
			return headerVars, success
		}
	}

	fperms := groups[user.Group].Forums[fid]
	//log.Printf("user.Perms: %+v\n", user.Perms)
	//log.Printf("fperms: %+v\n", fperms)
	if fperms.Overrides && !user.Is_Super_Admin {
		user.Perms.ViewTopic = fperms.ViewTopic
		user.Perms.LikeItem = fperms.LikeItem
		user.Perms.CreateTopic = fperms.CreateTopic
		user.Perms.EditTopic = fperms.EditTopic
		user.Perms.DeleteTopic = fperms.DeleteTopic
		user.Perms.CreateReply = fperms.CreateReply
		user.Perms.EditReply = fperms.EditReply
		user.Perms.DeleteReply = fperms.DeleteReply
		user.Perms.PinTopic = fperms.PinTopic
		user.Perms.CloseTopic = fperms.CloseTopic

		if len(fperms.ExtData) != 0 {
			for name, perm := range fperms.ExtData {
				user.PluginPerms[name] = perm
			}
		}
	}
	return headerVars, success
}

// Even if they have the right permissions, the control panel is only open to supermods+. There are many areas without subpermissions which assume that the current user is a supermod+ and admins are extremely unlikely to give these permissions to someone who isn't at-least a supermod to begin with
func _panel_session_check(w http.ResponseWriter, r *http.Request, user *User) (headerVars HeaderVars, stats PanelStats, success bool) {
	headerVars.Site = site
	if !user.Is_Super_Mod {
		NoPermissions(w,r,*user)
		return headerVars, stats, false
	}

	headerVars.Stylesheets = append(headerVars.Stylesheets,"panel.css")
	if len(themes[defaultTheme].Resources) != 0 {
		rlist := themes[defaultTheme].Resources
		for _, resource := range rlist {
			if resource.Location == "global" || resource.Location == "panel" {
				halves := strings.Split(resource.Name,".")
				if len(halves) != 2 {
					continue
				}
				if halves[1] == "css" {
					headerVars.Stylesheets = append(headerVars.Stylesheets,resource.Name)
				} else if halves[1] == "js" {
					headerVars.Scripts = append(headerVars.Scripts,resource.Name)
				}
			}
		}
	}

	err := group_count_stmt.QueryRow().Scan(&stats.Groups)
	if err != nil {
		InternalError(err,w)
		return headerVars, stats, false
	}

	stats.Users = users.GetGlobalCount()
	stats.Forums = fstore.GetGlobalCount() // TO-DO: Stop it from showing the blanked forums
	stats.Settings = len(settings) // TO-DO: IS this racey?
	stats.Themes = len(themes)
	stats.Reports = 0 // TO-DO: Do the report count. Only show open threads?

	pusher, ok := w.(http.Pusher)
	if ok {
		pusher.Push("/static/main.css", nil)
		pusher.Push("/static/panel.css", nil)
		pusher.Push("/static/global.js", nil)
		pusher.Push("/static/jquery-3.1.1.min.js", nil)
		// TO-DO: Push the theme CSS files
		// TO-DO: Push the theme scripts
		// TO-DO: Push avatars?
	}

	return headerVars, stats, true
}
func _simple_panel_session_check(w http.ResponseWriter, r *http.Request, user *User) (success bool) {
	if !user.Is_Super_Mod {
		NoPermissions(w,r,*user)
		return false
	}
	return true
}

func _session_check(w http.ResponseWriter, r *http.Request, user *User) (headerVars HeaderVars, success bool) {
	headerVars.Site = site
	if user.Is_Banned {
		headerVars.NoticeList = append(headerVars.NoticeList,"Your account has been suspended. Some of your permissions may have been revoked.")
	}

	if len(themes[defaultTheme].Resources) != 0 {
		rlist := themes[defaultTheme].Resources
		for _, resource := range rlist {
			if resource.Location == "global" || resource.Location == "frontend" {
				halves := strings.Split(resource.Name,".")
				if len(halves) != 2 {
					continue
				}
				if halves[1] == "css" {
					headerVars.Stylesheets = append(headerVars.Stylesheets,resource.Name)
				} else if halves[1] == "js" {
					headerVars.Scripts = append(headerVars.Scripts,resource.Name)
				}
			}
		}
	}

	pusher, ok := w.(http.Pusher)
	if ok {
		pusher.Push("/static/main.css", nil)
		pusher.Push("/static/global.js", nil)
		pusher.Push("/static/jquery-3.1.1.min.js", nil)
		// TO-DO: Push the theme CSS files
		// TO-DO: Push the theme scripts
		// TO-DO: Push avatars?
	}

	return headerVars, true
}

func _pre_route(w http.ResponseWriter, r *http.Request) (User,bool) {
	user, halt := auth.SessionCheck(w,r)
	if halt {
		return *user, false
	}
	if user == &guest_user {
		return *user, true
	}

	host, _, err := net.SplitHostPort(r.RemoteAddr)
	if err != nil {
		PreError("Bad IP",w,r)
		return *user, false
	}
	if host != user.Last_IP {
		_, err = update_last_ip_stmt.Exec(host, user.ID)
		if err != nil {
			InternalError(err,w)
			return *user, false
		}
		user.Last_IP = host
	}

	// TO-DO: Set the X-Frame-Options header
	return *user, true
}

func words_to_score(wcount int, topic bool) (score int) {
	if topic {
		score = 2
	} else {
		score = 1
	}

	if wcount >= settings["megapost_min_words"].(int) {
		score += 4
	} else if wcount >= settings["bigpost_min_words"].(int) {
		score += 1
	}
	return score
}

func increase_post_user_stats(wcount int, uid int, topic bool, user User) error {
	var mod int
	base_score := 1
	if topic {
		_, err := increment_user_topics_stmt.Exec(1, uid)
		if err != nil {
			return err
		}
		base_score = 2
	}

	if wcount >= settings["megapost_min_words"].(int) {
		_, err := increment_user_megaposts_stmt.Exec(1,1,1,uid)
		if err != nil {
			return err
		}
		mod = 4
	} else if wcount >= settings["bigpost_min_words"].(int) {
		_, err := increment_user_bigposts_stmt.Exec(1,1,uid)
		if err != nil {
			return err
		}
		mod = 1
	} else {
		_, err := increment_user_posts_stmt.Exec(1,uid)
		if err != nil {
			return err
		}
	}
	_, err := increment_user_score_stmt.Exec(base_score + mod, uid)
	if err != nil {
		return err
	}
	//log.Print(user.Score + base_score + mod)
	//log.Print(getLevel(user.Score + base_score + mod))
	_, err = update_user_level_stmt.Exec(getLevel(user.Score + base_score + mod), uid)
	return err
}

func decrease_post_user_stats(wcount int, uid int, topic bool, user User) error {
	var mod int
	base_score := -1
	if topic {
		_, err := increment_user_topics_stmt.Exec(-1, uid)
		if err != nil {
			return err
		}
		base_score = -2
	}

	if wcount >= settings["megapost_min_words"].(int) {
		_, err := increment_user_megaposts_stmt.Exec(-1,-1,-1,uid)
		if err != nil {
			return err
		}
		mod = 4
	} else if wcount >= settings["bigpost_min_words"].(int) {
		_, err := increment_user_bigposts_stmt.Exec(-1,-1,uid)
		if err != nil {
			return err
		}
		mod = 1
	} else {
		_, err := increment_user_posts_stmt.Exec(-1,uid)
		if err != nil {
			return err
		}
	}
	_, err := increment_user_score_stmt.Exec(base_score - mod, uid)
	if err != nil {
		return err
	}
	_, err = update_user_level_stmt.Exec(getLevel(user.Score - base_score - mod), uid)
	return err
}

func init_user_perms(user *User) {
	if user.Is_Super_Admin {
		user.Perms = AllPerms
		user.PluginPerms = AllPluginPerms
	} else {
		user.Perms = groups[user.Group].Perms
		user.PluginPerms = groups[user.Group].PluginPerms
	}

	user.Is_Admin = user.Is_Super_Admin || groups[user.Group].Is_Admin
	user.Is_Super_Mod = user.Is_Admin || groups[user.Group].Is_Mod
	user.Is_Mod = user.Is_Super_Mod
	user.Is_Banned = groups[user.Group].Is_Banned
	if user.Is_Banned && user.Is_Super_Mod {
		user.Is_Banned = false
	}
}

func build_profile_url(slug string, uid int) string {
	if slug == "" {
		return "/user/" + strconv.Itoa(uid)
	}
	return "/user/" + slug + "." + strconv.Itoa(uid)
}