package funmow

import (
	"fmt"
	"sort"
	"strings"
)

const (
	MatchNone = iota
	MatchOne
	MatchMany
)

type Object struct {
	ID          DBRef  `json:"id"`
	Next        DBRef  `json:"next"`
	Type        string `json:"type"`
	Name        string `json:"name"`
	Description string `json:"description"`
	//Links       map[string]map[string]bool `json:"links"`
	//Inside      DBRef                      `json:"inside"`
	Owner DBRef `json:"owner"`
	db    *DB
}

type ObjectFactory struct {
	db *DB
}

func NewObjectFactory(db *DB) *ObjectFactory {
	return &ObjectFactory{db: db}
}

func (f *ObjectFactory) NewObject() Object {
	o := Object{}
	o.ID, _ = f.db.Allocate()
	o.db = f.db
	return o
}

func (f *ObjectFactory) NewExit(name string, next DBRef, owner DBRef) Object {
	o := Object{
		Type:  "exit",
		Name:  name,
		Next:  next,
		Owner: owner,
		db:    f.db,
	}
	o.ID, _ = f.db.Allocate()
	return o
}

func (f *ObjectFactory) NewRoom() Object {
	o := Object{}
	o.ID, _ = f.db.Allocate()
	o.Type = "room"
	o.db = f.db
	return o
}

func (f *ObjectFactory) NewThing() Object {
	o := Object{}
	o.ID, _ = f.db.Allocate()
	o.Type = "thing"
	o.db = f.db
	return o
}

func (o *Object) Commit() error {
	return o.db.StoreObject(*o, o.ID)
}

func (o *Object) Refresh() bool {
	refreshed, found := o.db.RetrieveObject(o.ID)
	if found {
		*o = refreshed
	}
	return found
}

func (o Object) String() string {
	return fmt.Sprintf("id %d: %s", o.ID, o.Name)
}

func (o *Object) Remove(c *Object) error {
	return o.db.Unlink(o.ID, c.ID)
}

func (o *Object) Delete() error {
	err := o.db.Delete(o.ID)
	if err == nil {
		*o = Object{}
	}
	return err
}

func (o *Object) Contains(c *Object) error {
	return o.db.Link(o.ID, c.ID, c.Type)
}

func (o *Object) MatchLinkNames(matchName string, player DBRef) ObjectList {
	if matchName == "here" {
		return ObjectList{*o}
	}
	if matchName == "me" {
		p, found := o.db.Fetch(player)
		if !found {
			return ObjectList{}
		} else {
			return ObjectList{p}
		}
	}
	r := make(ObjectList, 0)

	children := o.db.GetChildren(o.ID) // map[DBRef]string

	for childID, _ := range children {
		o, found := o.db.Fetch(childID)
		if found {
			idName := fmt.Sprintf("#%d", o.ID)
			lowerObjectName := strings.ToLower(o.Name)
			lowerMatchName := strings.ToLower(matchName)
			if strings.HasPrefix(lowerObjectName, lowerMatchName) || matchName == idName {
				r = append(r, o)
			}
		}
	}

	return r
}

func (o *Object) MatchExitNames(name string) ObjectList { // so much copypasta
	r := make(ObjectList, 0)

	children := o.db.GetChildren(o.ID) // map[DBRef]string

	for childID, childType := range children {
		if childType != "exit" {
			continue
		}
		o, found := o.db.Fetch(childID)
		if found {
			idName := fmt.Sprintf("#%d", childID)

			if strings.EqualFold(o.Name, name) || name == idName {
				r = append(r, o)
				break // have a match. Don't need to look for any more.
			}

			aliases := strings.Split(o.Name, ";")

			for _, v := range aliases {
				if v == name {
					r = append(r, o)
					break // no need to look at other aliases
				}
			}

		}
	}

	return r
}

func (o *Object) DetailedName() string {
	return fmt.Sprintf("%s (#%d)", o.Name, o.ID)
}

func (o *Object) GetLinkNames(matchType string, exclude DBRefList) []string {
	r := make([]string, 0)

	children := o.db.GetChildren(o.ID) // map[DBRef]string

	for childID, linkType := range children {
		if matchType != "*" && matchType != linkType {
			continue
		}
		skip := false
		for _, excludeID := range exclude {
			if excludeID == childID {
				fmt.Println("Skipping ", childID)
				skip = true
			}
		}
		if skip {
			continue
		}
		o, found := o.db.Fetch(childID)
		if found {
			if linkType == "exit" {
				r = append(r, o.Name)
			} else {
				r = append(r, o.DetailedName())
			}
		}
	}

	sort.Strings(r)
	return r
}

type ObjectList []Object

func (l ObjectList) First() Object {
	if len(l) > 0 {
		return l[0]
	} else {
		return Object{}
	}
}

func (l ObjectList) ExactlyOne() (Object, int) {
	c := len(l)

	if c == 0 {
		return Object{}, MatchNone
	} else if c == 1 {
		return l[0], MatchOne
	} else {
		return Object{}, MatchMany
	}
}