package object

import (
	"github.com/demodesk/neko/pkg/types"
)

func New(config Config) types.MemberProvider {
	return &MemberProviderCtx{
		config:  config,
		entries: make(map[string]*memberEntry),
	}
}

type MemberProviderCtx struct {
	config  Config
	entries map[string]*memberEntry
}

func (provider *MemberProviderCtx) Connect() error {
	var err error

	for _, entry := range provider.config.Users {
		_, err = provider.Insert(entry.Username, entry.Password, entry.Profile)
	}

	return err
}

func (provider *MemberProviderCtx) Disconnect() error {
	return nil
}

func (provider *MemberProviderCtx) Authenticate(username string, password string) (string, types.MemberProfile, error) {
	// id will be also username
	id := username

	entry, ok := provider.entries[id]
	if !ok {
		return "", types.MemberProfile{}, types.ErrMemberDoesNotExist
	}

	// TODO: Use hash function.
	if !entry.CheckPassword(password) {
		return "", types.MemberProfile{}, types.ErrMemberInvalidPassword
	}

	return id, entry.profile, nil
}

func (provider *MemberProviderCtx) Insert(username string, password string, profile types.MemberProfile) (string, error) {
	// id will be also username
	id := username

	_, ok := provider.entries[id]
	if ok {
		return "", types.ErrMemberAlreadyExists
	}

	provider.entries[id] = &memberEntry{
		// TODO: Use hash function.
		password: password,
		profile:  profile,
	}

	return id, nil
}

func (provider *MemberProviderCtx) UpdateProfile(id string, profile types.MemberProfile) error {
	entry, ok := provider.entries[id]
	if !ok {
		return types.ErrMemberDoesNotExist
	}

	entry.profile = profile

	return nil
}

func (provider *MemberProviderCtx) UpdatePassword(id string, password string) error {
	entry, ok := provider.entries[id]
	if !ok {
		return types.ErrMemberDoesNotExist
	}

	// TODO: Use hash function.
	entry.password = password

	return nil
}

func (provider *MemberProviderCtx) Select(id string) (types.MemberProfile, error) {
	entry, ok := provider.entries[id]
	if !ok {
		return types.MemberProfile{}, types.ErrMemberDoesNotExist
	}

	return entry.profile, nil
}

func (provider *MemberProviderCtx) SelectAll(limit int, offset int) (map[string]types.MemberProfile, error) {
	profiles := make(map[string]types.MemberProfile)

	i := 0
	for id, entry := range provider.entries {
		if i >= offset && (limit == 0 || i < offset+limit) {
			profiles[id] = entry.profile
		}

		i = i + 1
	}

	return profiles, nil
}

func (provider *MemberProviderCtx) Delete(id string) error {
	_, ok := provider.entries[id]
	if !ok {
		return types.ErrMemberDoesNotExist
	}

	delete(provider.entries, id)

	return nil
}