package main

import "sync"
import "encoding/json"
import "database/sql"
import _ "github.com/go-sql-driver/mysql"

var group_update_mutex sync.Mutex

type GroupAdmin struct
{
	ID int
	Name string
	Rank string
	RankClass string
	CanEdit bool
	CanDelete bool
}

type Group struct
{
	ID int
	Name string
	Is_Mod bool
	Is_Admin bool
	Is_Banned bool
	Tag string
	Perms Perms
	PermissionsText []byte
	Forums []ForumPerms
	CanSee []int // The IDs of the forums this group can see
}

func create_group(group_name string, tag string, is_admin bool, is_mod bool, is_banned bool) (int, error) {
	var gid int
	err := group_entry_exists_stmt.QueryRow().Scan(&gid)
	if err != nil && err != sql.ErrNoRows {
		return 0, err
	}
	if err != sql.ErrNoRows {
		group_update_mutex.Lock()
		_, err = update_group_rank_stmt.Exec(is_admin, is_mod, is_banned, gid)
		if err != nil {
			return gid, err
		}
		_, err = update_group_stmt.Exec(group_name, tag, gid)
		if err != nil {
			return gid, err
		}
		
		groups[gid].Name = group_name
		groups[gid].Tag = tag
		groups[gid].Is_Banned = is_banned
		groups[gid].Is_Mod = is_mod
		groups[gid].Is_Admin = is_admin
		
		group_update_mutex.Unlock()
		return gid, nil
	}
	
	var permstr string = "{}"
	res, err := create_group_stmt.Exec(group_name, tag, is_admin, is_mod, is_banned, permstr)
	if err != nil {
		return 0, err
	}
	
	gid64, err := res.LastInsertId()
	if err != nil {
		return 0, err
	}
	gid = int(gid64)
	perms := BlankPerms
	var blankForums []ForumPerms
	var blankIntList []int
	groups = append(groups, Group{gid,group_name,is_mod,is_admin,is_banned,tag,perms,[]byte(permstr),blankForums,blankIntList})
	
	// Generate the forum permissions based on the presets...
	fdata := forums
	permupdate_mutex.Lock()
	for _, forum := range fdata {
		var thePreset string
		if is_admin {
			thePreset = "admins"
		} else if is_mod {
			thePreset = "staff"
		} else if is_banned {
			thePreset = "banned"
		} else {
			thePreset = "members"
		}
		
		permmap := preset_to_permmap(forum.Preset)
		permitem := permmap[thePreset]
		permitem.Overrides = true
		permstr, err := json.Marshal(permitem)
		if err != nil {
			return gid, err
		}
		perms := string(permstr)
		_, err = add_forum_perms_to_group_stmt.Exec(gid,forum.ID,forum.Preset,perms)
		if err != nil {
			return gid, err
		}
		
		err = rebuild_forum_permissions(forum.ID)
		if err != nil {
			return gid, err
		}
	}
	permupdate_mutex.Unlock()
	return gid, nil
}

func group_exists(gid int) bool {
	return (gid <= groupCapCount) && (gid > 0) && groups[gid].Name!=""
}