package nkode

import (
	"errors"
	"fmt"
	"github.com/google/uuid"
	m "go-nkode/core/model"
	"go-nkode/hashset"
	py "go-nkode/py-builtin"
	"go-nkode/util"
)

type Customer struct {
	Id          m.CustomerId
	NKodePolicy m.NKodePolicy
	Attributes  CustomerAttributes
}

func NewCustomer(nkodePolicy m.NKodePolicy) (*Customer, error) {
	customerAttrs, err := NewCustomerAttributes()
	if err != nil {
		return nil, err
	}
	customer := Customer{
		Id:          m.CustomerId(uuid.New()),
		NKodePolicy: nkodePolicy,
		Attributes:  *customerAttrs,
	}

	return &customer, nil
}

//func (c *Customer) AddNewUser(username m.Username, passcodeIdx []int, ui UserInterface, kp m.KeypadDimension) error {
//	_, exists := c.Users[username]
//	if exists {
//		return errors.New(fmt.Sprintf("User %s already exists for customer %+v exists", username, c.Id))
//	}
//	setVals, err := c.Attributes.SetVals(kp)
//	if err != nil {
//		return err
//	}
//	newKeys, err := NewUserCipherKeys(&kp, setVals, c.NKodePolicy.MaxNkodeLen)
//	if err != nil {
//		return err
//	}
//	encipheredNKode, err := newKeys.EncipherNKode(passcodeIdx, c.Attributes)
//	if err != nil {
//		return err
//	}
//	newUser := User{
//		Id:                 m.UserId(uuid.New()),
//		Username:           username,
//		EncipheredPasscode: *encipheredNKode,
//		UserKeys:           *newKeys,
//		Interface:          ui,
//		Kp:                 kp,
//	}
//	c.Users[username] = newUser
//	return nil
//}

//func (c *Customer) ValidKeyEntry(username m.Username, selectedKeys []int) ([]int, error) {
//	user, exists := c.Users[username]
//	if !exists {
//		return nil, errors.New(fmt.Sprintf("user %s does not exist for customer %+v", username, c.Id))
//	}
//
//	validKeys := py.All[int](selectedKeys, func(idx int) bool {
//		return 0 <= idx && idx < user.Kp.NumbOfKeys
//	})
//	if !validKeys {
//		return nil, errors.New(fmt.Sprintf("one or more keys not in range 0-%d", user.Kp.NumbOfKeys-1))
//	}
//	presumedAttrIdxVals, err := c.getPresumedAttributeIdxVals(user, selectedKeys)
//	if err != nil {
//		return nil, err
//	}
//	err = c.IsValidNKode(user.Kp, presumedAttrIdxVals)
//	if err != nil {
//		return nil, err
//	}
//	attrVals, err := c.Attributes.AttrVals(user.Kp)
//	if err != nil {
//		return nil, err
//	}
//	err = user.UserKeys.ValidPassword(user.EncipheredPasscode.Code, presumedAttrIdxVals, attrVals)
//	if err != nil {
//		return nil, err
//	}
//
//	return presumedAttrIdxVals, nil
//}

//func (c *Customer) getPresumedAttributeIdxVals(user User, selectedKeys []int) ([]int, error) {
//
//	passcodeLen := len(selectedKeys)
//	if passcodeLen < c.NKodePolicy.MinNkodeLen || passcodeLen > c.NKodePolicy.MaxNkodeLen {
//		return nil, errors.New(fmt.Sprintf("Invalid passcode length of %d. Passcode length must be in range %d-%d", passcodeLen, c.NKodePolicy.MinNkodeLen, c.NKodePolicy.MaxNkodeLen))
//	}
//
//	setVals, err := c.Attributes.SetVals(user.Kp)
//	if err != nil {
//		return nil, err
//	}
//	passcodeSetVals, err := user.DecipherMask(setVals, passcodeLen)
//	if err != nil {
//		return nil, err
//	}
//	presumedAttrIdxVals := make([]int, passcodeLen)
//
//	for idx := range presumedAttrIdxVals {
//		keyNumb := selectedKeys[idx]
//		setIdx, err := c.Attributes.IndexOfSet(passcodeSetVals[idx])
//		if err != nil {
//			return nil, err
//		}
//		selectedAttrIdx, err := user.Interface.GetAttrIdxByKeyNumbSetIdx(setIdx, keyNumb)
//		if err != nil {
//			return nil, err
//		}
//		presumedAttrIdxVals[idx] = selectedAttrIdx
//	}
//	return presumedAttrIdxVals, nil
//}

func (c *Customer) IsValidNKode(kp m.KeypadDimension, passcodeAttrIdx []int) error {
	nkodeLen := len(passcodeAttrIdx)
	if nkodeLen < c.NKodePolicy.MinNkodeLen {
		return errors.New(fmt.Sprintf("NKode length %d is too short. Minimum nKode length is %d", nkodeLen, c.NKodePolicy.MinNkodeLen))
	}

	validIdx := py.All[int](passcodeAttrIdx, func(i int) bool {
		return i >= 0 && i < kp.TotalAttrs()
	})

	if !validIdx {
		return errors.New(fmt.Sprintf("One or more idx out of range 0-%d in IsValidNKode", kp.TotalAttrs()-1))
	}
	passcodeSetVals := make(hashset.Set[uint64])
	passcodeAttrVals := make(hashset.Set[uint64])
	attrVals, err := c.Attributes.AttrVals(kp)
	if err != nil {
		return err
	}
	for idx := 0; idx < nkodeLen; idx++ {
		attrVal := attrVals[passcodeAttrIdx[idx]]
		setVal, err := c.Attributes.GetAttrSetVal(attrVal, kp)
		if err != nil {
			return err
		}
		passcodeSetVals.Add(setVal)
		passcodeAttrVals.Add(attrVal)
	}

	if passcodeSetVals.Size() < c.NKodePolicy.DistinctSets {
		return errors.New(fmt.Sprintf("passcode has two few distinct sets min %d, has %d", c.NKodePolicy.DistinctSets, passcodeSetVals.Size()))
	}

	if passcodeAttrVals.Size() < c.NKodePolicy.DistinctAttributes {
		return errors.New(fmt.Sprintf("passcode has two few distinct attributes min %d, has %d", c.NKodePolicy.DistinctAttributes, passcodeAttrVals.Size()))
	}
	return nil
}

func (c *Customer) RenewKeys() ([]uint64, []uint64) {
	oldAttrs := make([]uint64, m.KeypadMax.TotalAttrs())
	oldSets := make([]uint64, m.KeypadMax.AttrsPerKey)
	allAttrVals, err := c.Attributes.AttrVals(m.KeypadMax)
	if err != nil {
		panic(err)
	}
	allSetVals, err := c.Attributes.AttrVals(m.KeypadMax)
	if err != nil {
		panic(err)
	}
	copy(oldAttrs, allAttrVals)
	copy(oldSets, allSetVals)

	err = c.Attributes.Renew()
	if err != nil {
		panic(err)
	}
	allAttrVals, err = c.Attributes.AttrVals(m.KeypadMax)
	if err != nil {
		panic(err)
	}
	allSetVals, err = c.Attributes.SetVals(m.KeypadMax)
	if err != nil {
		panic(err)
	}
	attrsXor, err := util.XorLists(oldAttrs, allAttrVals)
	if err != nil {
		panic(err)
	}
	setXor, err := util.XorLists(oldSets, allSetVals)
	if err != nil {
		panic(err)
	}
	return setXor, attrsXor
}