package main
import "log"
import "fmt"
import "sync"
import "strconv"
import "encoding/json"

var BlankPerms Perms
var BlankForumPerms ForumPerms
var GuestPerms Perms
var ReadForumPerms ForumPerms
var ReadReplyForumPerms ForumPerms
var ReadWriteForumPerms ForumPerms
var AllPerms Perms
var AllForumPerms ForumPerms

// Permission Structure: ActionComponent[Subcomponent]Flag
type Perms struct
{
	// Global Permissions
	BanUsers bool
	ActivateUsers bool
	EditUser bool
	EditUserEmail bool
	EditUserPassword bool
	EditUserGroup bool
	EditUserGroupSuperMod bool
	EditUserGroupAdmin bool
	ManageForums bool // This could be local, albeit limited for per-forum managers
	EditSettings bool
	ManageThemes bool
	ManagePlugins bool
	ViewIPs bool
	
	// Forum permissions
	ViewTopic bool
	CreateTopic bool
	EditTopic bool
	DeleteTopic bool
	CreateReply bool
	//CreateReplyToOwn bool
	EditReply bool
	//EditOwnReply bool
	DeleteReply bool
	PinTopic bool
	CloseTopic bool
	//CloseOwnTopic bool
	
	ExtData interface{}
}

/* Inherit from group permissions for ones we don't have */
type ForumPerms struct
{
	ViewTopic bool
	CreateTopic bool
	EditTopic bool
	DeleteTopic bool
	CreateReply bool
	//CreateReplyToOwn bool
	EditReply bool
	//EditOwnReply bool
	DeleteReply bool
	PinTopic bool
	CloseTopic bool
	//CloseOwnTopic bool
	
	Overrides bool
	ExtData map[string]bool
}

func init() {
	BlankPerms = Perms{
		ExtData: make(map[string]bool),
	}
	
	BlankForumPerms = ForumPerms{
		ExtData: make(map[string]bool),
	}
	
	GuestPerms = Perms{
		ViewTopic: true,
		ExtData: make(map[string]bool),
	}
	
	AllPerms = Perms{
		BanUsers: true,
		ActivateUsers: true,
		EditUser: true,
		EditUserEmail: true,
		EditUserPassword: true,
		EditUserGroup: true,
		EditUserGroupSuperMod: true,
		EditUserGroupAdmin: true,
		ManageForums: true,
		EditSettings: true,
		ManageThemes: true,
		ManagePlugins: true,
		ViewIPs: true,
		
		ViewTopic: true,
		CreateTopic: true,
		EditTopic: true,
		DeleteTopic: true,
		CreateReply: true,
		EditReply: true,
		DeleteReply: true,
		PinTopic: true,
		CloseTopic: true,
		
		ExtData: make(map[string]bool),
	}
	
	AllForumPerms = ForumPerms{
		ViewTopic: true,
		CreateTopic: true,
		EditTopic: true,
		DeleteTopic: true,
		CreateReply: true,
		EditReply: true,
		DeleteReply: true,
		PinTopic: true,
		CloseTopic: true,
		
		Overrides: true,
		ExtData: make(map[string]bool),
	}
	
	ReadWriteForumPerms = ForumPerms{
		ViewTopic: true,
		CreateTopic: true,
		CreateReply: true,
		Overrides: true,
		ExtData: make(map[string]bool),
	}
	
	ReadReplyForumPerms = ForumPerms{
		ViewTopic: true,
		CreateReply: true,
		Overrides: true,
		ExtData: make(map[string]bool),
	}
	
	ReadForumPerms = ForumPerms{
		ViewTopic: true,
		Overrides: true,
		ExtData: make(map[string]bool),
	}
	
	if debug {
		fmt.Printf("Guest Perms: ")
		fmt.Printf("%+v\n", GuestPerms)
		fmt.Printf("All Perms: ")
		fmt.Printf("%+v\n", AllPerms)
	}
}

func preset_to_permmap(preset string) (out map[string]ForumPerms) {
	out = make(map[string]ForumPerms)
	switch(preset) {
		case "all":
			out["guests"] = ReadForumPerms
			out["members"] = ReadWriteForumPerms
			out["staff"] = AllForumPerms
			out["admins"] = AllForumPerms
		case "announce":
			out["guests"] = ReadForumPerms
			out["members"] = ReadReplyForumPerms
			out["staff"] = AllForumPerms
			out["admins"] = AllForumPerms
		case "members":
			out["guests"] = BlankForumPerms
			out["members"] = ReadWriteForumPerms
			out["staff"] = AllForumPerms
			out["admins"] = AllForumPerms
		case "staff":
			out["guests"] = BlankForumPerms
			out["members"] = BlankForumPerms
			out["staff"] = ReadWriteForumPerms
			out["admins"] = AllForumPerms
		case "admins":
			out["guests"] = BlankForumPerms
			out["members"] = BlankForumPerms
			out["staff"] = BlankForumPerms
			out["admins"] = AllForumPerms
		case "archive":
			out["guests"] = ReadForumPerms
			out["members"] = ReadForumPerms
			out["staff"] = ReadForumPerms
			out["admins"] = ReadForumPerms //CurateForumPerms. Delete / Edit but no create?
		default:
			out["guests"] = BlankForumPerms
			out["members"] = BlankForumPerms
			out["staff"] = BlankForumPerms
			out["admins"] = BlankForumPerms
	}
	return out
}

var permupdate_mutex sync.Mutex
func permmap_to_query(permmap map[string]ForumPerms, fid int) error {
	permupdate_mutex.Lock()
	defer permupdate_mutex.Unlock()
	
	_, err := delete_forum_perms_by_forum_stmt.Exec(fid)
	if err != nil {
		return err
	}
	
	perms, err := json.Marshal(permmap["admins"])
	_, err = add_forum_perms_to_forum_admins_stmt.Exec(fid,"",perms)
	if err != nil {
		return err
	}
	
	perms, err = json.Marshal(permmap["staff"])
	_, err = add_forum_perms_to_forum_staff_stmt.Exec(fid,"",perms)
	if err != nil {
		return err
	}
	
	perms, err = json.Marshal(permmap["members"])
	_, err = add_forum_perms_to_forum_members_stmt.Exec(fid,"",perms)
	if err != nil {
		return err
	}
	
	perms, err = json.Marshal(permmap["guests"])
	_, err = add_forum_perms_to_forum_guests_stmt.Exec(fid,"",perms)
	if err != nil {
		return err
	}
	
	return rebuild_forum_permissions(fid)
}

func rebuild_forum_permissions(fid int) error {
	log.Print("Loading the forum permissions")
	rows, err := db.Query("select gid, permissions from forums_permissions where fid = ? order by gid asc", fid)
	if err != nil {
		return err
	}
	defer rows.Close()
	
	log.Print("Updating the forum permissions")
	for rows.Next() {
		var gid int
		var perms []byte
		var pperms ForumPerms
		err := rows.Scan(&gid, &perms)
		if err != nil {
			return err
		}
		err = json.Unmarshal(perms, &pperms)
		if err != nil {
			return err
		}
		pperms.ExtData = make(map[string]bool)
		pperms.Overrides = true
		_, ok := forum_perms[gid]
		if !ok {
			forum_perms[gid] = make(map[int]ForumPerms)
		}
		forum_perms[gid][fid] = pperms
	}
	for gid, _ := range groups {
		log.Print("Updating the forum permissions for Group #" + strconv.Itoa(gid))
		var blank_list []ForumPerms
		var blank_int_list []int
		groups[gid].Forums = blank_list
		groups[gid].CanSee = blank_int_list
		
		for ffid, _ := range forums {
			forum_perm, ok := forum_perms[gid][ffid]
			if ok {
				//log.Print("Overriding permissions for forum #" + strconv.Itoa(fid))
				groups[gid].Forums = append(groups[gid].Forums,forum_perm)
			} else {
				//log.Print("Inheriting from default for forum #" + strconv.Itoa(fid))
				forum_perm = BlankForumPerms
				groups[gid].Forums = append(groups[gid].Forums,forum_perm)
			}
			
			if forum_perm.Overrides {
				if forum_perm.ViewTopic {
					groups[gid].CanSee = append(groups[gid].CanSee, ffid)
				}
			} else if groups[gid].Perms.ViewTopic {
				groups[gid].CanSee = append(groups[gid].CanSee, ffid)
			}
		}
		//fmt.Printf("%+v\n", groups[gid].CanSee)
		//fmt.Printf("%+v\n", groups[gid].Forums)
		//fmt.Println(len(groups[gid].Forums))
	}
	return nil
}

func build_forum_permissions() error {
	return nil
}