package domain

import (
	"fmt"
	"math"
	"time"
)

const TribeSnapshotRetentionForClosedServers = 180 * 24 * time.Hour

type TribeSnapshot struct {
	id          int
	tribeID     int
	serverKey   string
	numMembers  int
	numVillages int
	points      int
	allPoints   int
	rank        int
	od          OpponentsDefeated
	dominance   float64
	date        time.Time
	createdAt   time.Time
}

const tribeSnapshotModelName = "TribeSnapshot"

// UnmarshalTribeSnapshotFromDatabase unmarshals TribeSnapshot from the database.
//
// It should be used only for unmarshalling from the database!
// You can't use UnmarshalTribeSnapshotFromDatabase as constructor - It may put domain into the invalid state!
func UnmarshalTribeSnapshotFromDatabase(
	id int,
	tribeID int,
	serverKey string,
	numMembers int,
	numVillages int,
	points int,
	allPoints int,
	rank int,
	od OpponentsDefeated,
	dominance float64,
	date time.Time,
	createdAt time.Time,
) (TribeSnapshot, error) {
	if err := validateIntInRange(id, 1, math.MaxInt); err != nil {
		return TribeSnapshot{}, ValidationError{
			Model: tribeSnapshotModelName,
			Field: "id",
			Err:   err,
		}
	}

	if err := validateIntInRange(tribeID, 1, math.MaxInt); err != nil {
		return TribeSnapshot{}, ValidationError{
			Model: tribeSnapshotModelName,
			Field: "tribeID",
			Err:   err,
		}
	}

	if err := validateServerKey(serverKey); err != nil {
		return TribeSnapshot{}, ValidationError{
			Model: tribeSnapshotModelName,
			Field: "serverKey",
			Err:   err,
		}
	}

	return TribeSnapshot{
		id:          id,
		tribeID:     tribeID,
		serverKey:   serverKey,
		numMembers:  numMembers,
		numVillages: numVillages,
		points:      points,
		allPoints:   allPoints,
		rank:        rank,
		od:          od,
		dominance:   dominance,
		date:        date,
		createdAt:   createdAt,
	}, nil
}

func (ts TribeSnapshot) ID() int {
	return ts.id
}

func (ts TribeSnapshot) TribeID() int {
	return ts.tribeID
}

func (ts TribeSnapshot) ServerKey() string {
	return ts.serverKey
}

func (ts TribeSnapshot) NumMembers() int {
	return ts.numMembers
}

func (ts TribeSnapshot) NumVillages() int {
	return ts.numVillages
}

func (ts TribeSnapshot) Points() int {
	return ts.points
}

func (ts TribeSnapshot) AllPoints() int {
	return ts.allPoints
}

func (ts TribeSnapshot) Rank() int {
	return ts.rank
}

func (ts TribeSnapshot) OD() OpponentsDefeated {
	return ts.od
}

func (ts TribeSnapshot) Dominance() float64 {
	return ts.dominance
}

func (ts TribeSnapshot) Date() time.Time {
	return ts.date
}

func (ts TribeSnapshot) CreatedAt() time.Time {
	return ts.createdAt
}

func (ts TribeSnapshot) WithRelations(tribe TribeMeta) TribeSnapshotWithRelations {
	return TribeSnapshotWithRelations{
		snapshot: ts,
		tribe:    tribe,
	}
}

func (ts TribeSnapshot) ToCursor() (TribeSnapshotCursor, error) {
	return NewTribeSnapshotCursor(ts.id, ts.serverKey, ts.date)
}

func (ts TribeSnapshot) IsZero() bool {
	return ts == TribeSnapshot{}
}

type TribeSnapshots []TribeSnapshot

type TribeSnapshotWithRelations struct {
	snapshot TribeSnapshot
	tribe    TribeMeta
}

func (ts TribeSnapshotWithRelations) TribeSnapshot() TribeSnapshot {
	return ts.snapshot
}

func (ts TribeSnapshotWithRelations) Tribe() TribeMeta {
	return ts.tribe
}

func (ts TribeSnapshotWithRelations) IsZero() bool {
	return ts.snapshot.IsZero()
}

type TribeSnapshotsWithRelations []TribeSnapshotWithRelations

type CreateTribeSnapshotParams struct {
	tribeID     int
	serverKey   string
	numMembers  int
	numVillages int
	points      int
	allPoints   int
	rank        int
	od          OpponentsDefeated
	dominance   float64
	date        time.Time
}

func NewCreateTribeSnapshotParams(tribes Tribes, date time.Time) ([]CreateTribeSnapshotParams, error) {
	params := make([]CreateTribeSnapshotParams, 0, len(tribes))

	for i, t := range tribes {
		if t.IsZero() {
			return nil, fmt.Errorf("tribes[%d] is an empty struct", i)
		}

		if t.IsDeleted() {
			continue
		}

		params = append(params, CreateTribeSnapshotParams{
			tribeID:     t.ID(),
			serverKey:   t.ServerKey(),
			numMembers:  t.NumMembers(),
			numVillages: t.NumVillages(),
			points:      t.Points(),
			allPoints:   t.AllPoints(),
			rank:        t.Rank(),
			od:          t.OD(),
			dominance:   t.Dominance(),
			date:        date,
		})
	}

	return params, nil
}

func (params CreateTribeSnapshotParams) TribeID() int {
	return params.tribeID
}

func (params CreateTribeSnapshotParams) ServerKey() string {
	return params.serverKey
}

func (params CreateTribeSnapshotParams) NumMembers() int {
	return params.numMembers
}

func (params CreateTribeSnapshotParams) NumVillages() int {
	return params.numVillages
}

func (params CreateTribeSnapshotParams) Points() int {
	return params.points
}

func (params CreateTribeSnapshotParams) AllPoints() int {
	return params.allPoints
}

func (params CreateTribeSnapshotParams) Rank() int {
	return params.rank
}

func (params CreateTribeSnapshotParams) OD() OpponentsDefeated {
	return params.od
}

func (params CreateTribeSnapshotParams) Dominance() float64 {
	return params.dominance
}

func (params CreateTribeSnapshotParams) Date() time.Time {
	return params.date
}

type TribeSnapshotSort uint8

const (
	TribeSnapshotSortDateASC TribeSnapshotSort = iota + 1
	TribeSnapshotSortDateDESC
	TribeSnapshotSortIDASC
	TribeSnapshotSortIDDESC
	TribeSnapshotSortServerKeyASC
	TribeSnapshotSortServerKeyDESC
)

// IsInConflict returns true if two sorts can't be used together
// (e.g. TribeSnapshotSortIDASC and TribeSnapshotSortIDDESC).
func (s TribeSnapshotSort) IsInConflict(s2 TribeSnapshotSort) bool {
	return isSortInConflict(s, s2)
}

//nolint:gocyclo
func (s TribeSnapshotSort) String() string {
	switch s {
	case TribeSnapshotSortDateASC:
		return "date:ASC"
	case TribeSnapshotSortDateDESC:
		return "date:DESC"
	case TribeSnapshotSortIDASC:
		return "id:ASC"
	case TribeSnapshotSortIDDESC:
		return "id:DESC"
	case TribeSnapshotSortServerKeyASC:
		return "serverKey:ASC"
	case TribeSnapshotSortServerKeyDESC:
		return "serverKey:DESC"
	default:
		return "unknown tribe snapshot sort"
	}
}

type TribeSnapshotCursor struct {
	id        int
	serverKey string
	date      time.Time
}

const tribeSnapshotCursorModelName = "TribeSnapshotCursor"

func NewTribeSnapshotCursor(id int, serverKey string, date time.Time) (TribeSnapshotCursor, error) {
	if err := validateIntInRange(id, 1, math.MaxInt); err != nil {
		return TribeSnapshotCursor{}, ValidationError{
			Model: tribeSnapshotCursorModelName,
			Field: "id",
			Err:   err,
		}
	}

	if err := validateServerKey(serverKey); err != nil {
		return TribeSnapshotCursor{}, ValidationError{
			Model: tribeSnapshotCursorModelName,
			Field: "serverKey",
			Err:   err,
		}
	}

	return TribeSnapshotCursor{
		id:        id,
		serverKey: serverKey,
		date:      date,
	}, nil
}

func decodeTribeSnapshotCursor(encoded string) (TribeSnapshotCursor, error) {
	m, err := decodeCursor(encoded)
	if err != nil {
		return TribeSnapshotCursor{}, err
	}

	id, err := m.int("id")
	if err != nil {
		return TribeSnapshotCursor{}, ErrInvalidCursor
	}

	serverKey, err := m.string("serverKey")
	if err != nil {
		return TribeSnapshotCursor{}, ErrInvalidCursor
	}

	date, err := m.time("date")
	if err != nil {
		return TribeSnapshotCursor{}, ErrInvalidCursor
	}

	tsc, err := NewTribeSnapshotCursor(
		id,
		serverKey,
		date,
	)
	if err != nil {
		return TribeSnapshotCursor{}, ErrInvalidCursor
	}

	return tsc, nil
}

func (tsc TribeSnapshotCursor) ID() int {
	return tsc.id
}

func (tsc TribeSnapshotCursor) ServerKey() string {
	return tsc.serverKey
}

func (tsc TribeSnapshotCursor) Date() time.Time {
	return tsc.date
}

func (tsc TribeSnapshotCursor) IsZero() bool {
	return tsc == TribeSnapshotCursor{}
}

func (tsc TribeSnapshotCursor) Encode() string {
	if tsc.IsZero() {
		return ""
	}

	return encodeCursor([]keyValuePair{
		{"id", tsc.id},
		{"serverKey", tsc.serverKey},
		{"date", tsc.date},
	})
}

type ListTribeSnapshotsParams struct {
	serverKeys []string
	tribeIDs   []int
	sort       []TribeSnapshotSort
	cursor     TribeSnapshotCursor
	limit      int
}

const (
	TribeSnapshotListMaxLimit         = 500
	listTribeSnapshotsParamsModelName = "ListTribeSnapshotsParams"
)

func NewListTribeSnapshotsParams() ListTribeSnapshotsParams {
	return ListTribeSnapshotsParams{
		sort: []TribeSnapshotSort{
			TribeSnapshotSortServerKeyASC,
			TribeSnapshotSortDateASC,
			TribeSnapshotSortIDASC,
		},
		limit: TribeSnapshotListMaxLimit,
	}
}

func (params *ListTribeSnapshotsParams) ServerKeys() []string {
	return params.serverKeys
}

func (params *ListTribeSnapshotsParams) SetServerKeys(serverKeys []string) error {
	for i, sk := range serverKeys {
		if err := validateServerKey(sk); err != nil {
			return SliceElementValidationError{
				Model: listTribeSnapshotsParamsModelName,
				Field: "serverKeys",
				Index: i,
				Err:   err,
			}
		}
	}

	params.serverKeys = serverKeys

	return nil
}

func (params *ListTribeSnapshotsParams) TribeIDs() []int {
	return params.tribeIDs
}

func (params *ListTribeSnapshotsParams) SetTribeIDs(tribeIDs []int) error {
	for i, id := range tribeIDs {
		if err := validateIntInRange(id, 1, math.MaxInt); err != nil {
			return SliceElementValidationError{
				Model: listTribeSnapshotsParamsModelName,
				Field: "tribeIDs",
				Index: i,
				Err:   err,
			}
		}
	}

	params.tribeIDs = tribeIDs

	return nil
}

func (params *ListTribeSnapshotsParams) Sort() []TribeSnapshotSort {
	return params.sort
}

const (
	tribeSnapshotSortMinLength = 0
	tribeSnapshotSortMaxLength = 3
)

func (params *ListTribeSnapshotsParams) SetSort(sort []TribeSnapshotSort) error {
	if err := validateSort(sort, tribeSnapshotSortMinLength, tribeSnapshotSortMaxLength); err != nil {
		return ValidationError{
			Model: listTribeSnapshotsParamsModelName,
			Field: "sort",
			Err:   err,
		}
	}

	params.sort = sort

	return nil
}

func (params *ListTribeSnapshotsParams) PrependSort(sort []TribeSnapshotSort) error {
	if len(sort) == 0 {
		return nil
	}

	if err := validateSliceLen(sort, 0, max(tribeSnapshotSortMaxLength-len(params.sort), 0)); err != nil {
		return ValidationError{
			Model: listTribeSnapshotsParamsModelName,
			Field: "sort",
			Err:   err,
		}
	}

	return params.SetSort(append(sort, params.sort...))
}

func (params *ListTribeSnapshotsParams) PrependSortString(
	sort []string,
	allowed []TribeSnapshotSort,
	maxLength int,
) error {
	if len(sort) == 0 {
		return nil
	}

	if err := validateSliceLen(sort, 0, max(min(tribeSnapshotSortMaxLength-len(params.sort), maxLength), 0)); err != nil {
		return ValidationError{
			Model: listTribeSnapshotsParamsModelName,
			Field: "sort",
			Err:   err,
		}
	}

	toPrepend := make([]TribeSnapshotSort, 0, len(sort))

	for i, s := range sort {
		converted, err := newSortFromString(s, allowed...)
		if err != nil {
			return SliceElementValidationError{
				Model: listTribeSnapshotsParamsModelName,
				Field: "sort",
				Index: i,
				Err:   err,
			}
		}
		toPrepend = append(toPrepend, converted)
	}

	return params.SetSort(append(toPrepend, params.sort...))
}

func (params *ListTribeSnapshotsParams) Cursor() TribeSnapshotCursor {
	return params.cursor
}

func (params *ListTribeSnapshotsParams) SetCursor(cursor TribeSnapshotCursor) error {
	params.cursor = cursor
	return nil
}

func (params *ListTribeSnapshotsParams) SetEncodedCursor(encoded string) error {
	decoded, err := decodeTribeSnapshotCursor(encoded)
	if err != nil {
		return ValidationError{
			Model: listTribeSnapshotsParamsModelName,
			Field: "cursor",
			Err:   err,
		}
	}

	params.cursor = decoded

	return nil
}

func (params *ListTribeSnapshotsParams) Limit() int {
	return params.limit
}

func (params *ListTribeSnapshotsParams) SetLimit(limit int) error {
	if err := validateIntInRange(limit, 1, TribeSnapshotListMaxLimit); err != nil {
		return ValidationError{
			Model: listTribeSnapshotsParamsModelName,
			Field: "limit",
			Err:   err,
		}
	}

	params.limit = limit

	return nil
}

type ListTribeSnapshotsResult struct {
	snapshots TribeSnapshots
	self      TribeSnapshotCursor
	next      TribeSnapshotCursor
}

const listTribeSnapshotsResultModelName = "ListTribeSnapshotsResult"

func NewListTribeSnapshotsResult(
	snapshots TribeSnapshots,
	next TribeSnapshot,
) (ListTribeSnapshotsResult, error) {
	var err error
	res := ListTribeSnapshotsResult{
		snapshots: snapshots,
	}

	if len(snapshots) > 0 {
		res.self, err = snapshots[0].ToCursor()
		if err != nil {
			return ListTribeSnapshotsResult{}, ValidationError{
				Model: listTribeSnapshotsResultModelName,
				Field: "self",
				Err:   err,
			}
		}
	}

	if !next.IsZero() {
		res.next, err = next.ToCursor()
		if err != nil {
			return ListTribeSnapshotsResult{}, ValidationError{
				Model: listTribeSnapshotsResultModelName,
				Field: "next",
				Err:   err,
			}
		}
	}

	return res, nil
}

func (res ListTribeSnapshotsResult) TribeSnapshots() TribeSnapshots {
	return res.snapshots
}

func (res ListTribeSnapshotsResult) Self() TribeSnapshotCursor {
	return res.self
}

func (res ListTribeSnapshotsResult) Next() TribeSnapshotCursor {
	return res.next
}

type ListTribeSnapshotsWithRelationsResult struct {
	snapshots TribeSnapshotsWithRelations
	self      TribeSnapshotCursor
	next      TribeSnapshotCursor
}

const listTribeSnapshotsWithRelationsResultModelName = "ListTribeSnapshotsWithRelationsResult"

func NewListTribeSnapshotsWithRelationsResult(
	snapshots TribeSnapshotsWithRelations,
	next TribeSnapshotWithRelations,
) (ListTribeSnapshotsWithRelationsResult, error) {
	var err error
	res := ListTribeSnapshotsWithRelationsResult{
		snapshots: snapshots,
	}

	if len(snapshots) > 0 {
		res.self, err = snapshots[0].TribeSnapshot().ToCursor()
		if err != nil {
			return ListTribeSnapshotsWithRelationsResult{}, ValidationError{
				Model: listTribeSnapshotsWithRelationsResultModelName,
				Field: "self",
				Err:   err,
			}
		}
	}

	if !next.IsZero() {
		res.next, err = next.TribeSnapshot().ToCursor()
		if err != nil {
			return ListTribeSnapshotsWithRelationsResult{}, ValidationError{
				Model: listTribeSnapshotsWithRelationsResultModelName,
				Field: "next",
				Err:   err,
			}
		}
	}

	return res, nil
}

func (res ListTribeSnapshotsWithRelationsResult) TribeSnapshots() TribeSnapshotsWithRelations {
	return res.snapshots
}

func (res ListTribeSnapshotsWithRelationsResult) Self() TribeSnapshotCursor {
	return res.self
}

func (res ListTribeSnapshotsWithRelationsResult) Next() TribeSnapshotCursor {
	return res.next
}