summercms/cabana/crud.go

package cabana

import (
	"context"
	"encoding/json"
	"errors"
	"math"
	"net/http"
	"reflect"
	"sort"
	"strconv"
	"strings"

	"git.golem15.com/golem15/summercms/lagoon"
	"git.golem15.com/golem15/summercms/pact"
	"gorm.io/gorm"
	"gorm.io/gorm/clause"
)

// CRUDService runs schema-projected record and bulk operations.
type CRUDService struct {
	DB *gorm.DB
}

// RecordInput is a decoded JSON object. Keys are untrusted.
type RecordInput struct {
	Body map[string]any
}

// BulkDeleteInput is the bulk-delete body.
type BulkDeleteInput struct {
	IDs []any `json:"ids"`
}

// BulkResult is the deleted-count payload.
type BulkResult struct {
	Deleted int `json:"deleted"`
}

// ValidationError is a D-10 validation_failed failure.
type ValidationError struct {
	Details map[string]any
}

func (e *ValidationError) Error() string { return "validation_failed" }

// CapabilityError is a fail-closed Fill/Validate failure with controller context.
type CapabilityError struct {
	ControllerID string
}

func (e *CapabilityError) Error() string {
	if e == nil {
		return "cabana: missing Fill/Validate capability"
	}
	return "cabana: controller " + e.ControllerID + ": missing Fill/Validate capability"
}

type recordNotFound struct{}

func (recordNotFound) Error() string { return "cabana: not found" }

type hasRules interface {
	Rules() map[string]string
}

// ProjectWritableFields copies only activation-bound writable keys.
// Unknown keys, case variants, nested objects, and protected columns are dropped.
func ProjectWritableFields(cc *CompiledController, body map[string]any) map[string]any {
	out := map[string]any{}
	if cc == nil || body == nil {
		return out
	}
	allowed := map[string]string{}
	for _, field := range cc.Writable {
		if field.FillKey == "" || protectedFillKey(field.Name) || protectedFillKey(field.FillKey) {
			continue
		}
		allowed[field.Name] = field.FillKey
	}
	for key, val := range body {
		fillKey, ok := allowed[key]
		if !ok || nestedValue(val) {
			continue
		}
		out[fillKey] = val
	}
	return out
}

// BindWritableFields records schema field names onto model column fill keys.
// Protected columns are omitted. A scalar field with no column fails activation.
func BindWritableFields(cc *CompiledController) error {
	if cc == nil || cc.Form == nil {
		return nil
	}
	id := ""
	if cc.Controller != nil {
		id = cc.Controller.ID()
	}
	src, ok := cc.Controller.(pact.AdminRecordSource)
	if !ok || src == nil || src.NewRecord() == nil {
		return nil
	}
	cols := modelColumns(src.NewRecord())
	bindings := make([]WritableField, 0, len(cc.Form.Fields))
	for _, field := range cc.Form.Fields {
		if !scalarFormField(field.Type) || protectedFillKey(field.Name) {
			continue
		}
		if _, known := cols[field.Name]; !known {
			return errors.New("cabana: controller " + id + ": field " + field.Name + " is not a model column")
		}
		bindings = append(bindings, WritableField{Name: field.Name, FillKey: field.Name})
	}
	cc.Writable = bindings
	return nil
}

// Create persists a projected record after Fill and Validate.
func (s CRUDService) Create(ctx context.Context, cc *CompiledController, in RecordInput) (map[string]any, error) {
	res, err := s.save(ctx, cc, nil, in, false)
	return res.Data, err
}

// Update persists a projected change after Fill and Validate.
func (s CRUDService) Update(ctx context.Context, cc *CompiledController, id any, in RecordInput) (map[string]any, error) {
	res, err := s.save(ctx, cc, id, in, true)
	return res.Data, err
}

// CreateRecord is Create plus the relation labels of the saved record (D-18).
func (s CRUDService) CreateRecord(ctx context.Context, cc *CompiledController, in RecordInput) (RecordResult, error) {
	return s.save(ctx, cc, nil, in, false)
}

// UpdateRecord is Update plus the relation labels of the saved record (D-18).
func (s CRUDService) UpdateRecord(ctx context.Context, cc *CompiledController, id any, in RecordInput) (RecordResult, error) {
	return s.save(ctx, cc, id, in, true)
}

// Delete removes one scoped record. A missing or out-of-scope id is a successful no-op.
func (s CRUDService) Delete(ctx context.Context, cc *CompiledController, id any) (BulkResult, error) {
	if s.DB == nil {
		return BulkResult{}, errors.New("cabana: database is not configured")
	}
	if ctx == nil {
		ctx = context.Background()
	}
	if _, err := newWritableModel(cc); err != nil {
		return BulkResult{}, err
	}
	var result BulkResult
	err := s.DB.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
		tx = tx.WithContext(ctx)
		target, err := newWritableModel(cc)
		if err != nil {
			return err
		}
		pk, err := coercePK(target, id)
		if err != nil {
			return err
		}
		if err := loadRecord(ctx, tx, cc, target, pk); err != nil {
			var missing recordNotFound
			if errors.As(err, &missing) {
				result.Deleted = 0
				return nil
			}
			return err
		}
		if err := deleteRecord(ctx, tx, cc, target); err != nil {
			return err
		}
		result.Deleted = 1
		return nil
	})
	if err != nil {
		return BulkResult{}, err
	}
	return result, nil
}

// BulkDelete removes a normalized id set in one transaction.
// An empty selection is validation_failed. A wholly absent selection is a
// successful no-op. A mixed present/absent selection conflicts and rolls back.
func (s CRUDService) BulkDelete(ctx context.Context, cc *CompiledController, in BulkDeleteInput) (BulkResult, error) {
	if s.DB == nil {
		return BulkResult{}, errors.New("cabana: database is not configured")
	}
	if ctx == nil {
		ctx = context.Background()
	}
	ids, err := normalizeIDs(in.IDs)
	if err != nil {
		return BulkResult{}, err
	}
	if _, err := newWritableModel(cc); err != nil {
		return BulkResult{}, err
	}
	var result BulkResult
	err = s.DB.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
		tx = tx.WithContext(ctx)
		if err := ctx.Err(); err != nil {
			return lifecycleFailure(cc, err)
		}
		proto, err := newWritableModel(cc)
		if err != nil {
			return err
		}
		rows, err := lockScoped(ctx, tx, cc, proto, ids)
		if err != nil {
			return err
		}
		if len(rows) == 0 {
			result.Deleted = 0
			return nil
		}
		if len(rows) != len(ids) {
			return partialSelection{}
		}
		for _, row := range rows {
			if err := ctx.Err(); err != nil {
				return lifecycleFailure(cc, err)
			}
			if err := deleteRecord(ctx, tx, cc, row); err != nil {
				return err
			}
		}
		result.Deleted = len(rows)
		return nil
	})
	if err != nil {
		return BulkResult{}, err
	}
	return result, nil
}

// Show loads one scoped record. Missing and out-of-scope ids are identical.
func (s CRUDService) Show(ctx context.Context, cc *CompiledController, id any) (map[string]any, error) {
	res, err := s.ShowRecord(ctx, cc, id)
	if err != nil {
		return nil, err
	}
	return res.Data, nil
}

// ShowRecord is Show plus the relation labels of the record (D-18).
func (s CRUDService) ShowRecord(ctx context.Context, cc *CompiledController, id any) (RecordResult, error) {
	if s.DB == nil {
		return RecordResult{}, errors.New("cabana: database is not configured")
	}
	if ctx == nil {
		ctx = context.Background()
	}
	var result RecordResult
	err := s.DB.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
		tx = tx.WithContext(ctx)
		target, err := newWritableModel(cc)
		if err != nil {
			return err
		}
		pk, err := coercePK(target, id)
		if err != nil {
			return err
		}
		if err := loadRecord(ctx, tx, cc, target, pk); err != nil {
			return err
		}
		result, err = projectFullRecord(ctx, tx, cc, target)
		return err
	})
	if err != nil {
		return RecordResult{}, err
	}
	return result, nil
}

// projectFullRecord is the D-18 record shape: scalar writable fields, relation
// values keyed by field name, and their labels.
func projectFullRecord(ctx context.Context, tx *gorm.DB, cc *CompiledController, model any) (RecordResult, error) {
	data := projectRecord(cc, model)
	meta, err := projectRelationFields(ctx, tx, cc, model, data)
	if err != nil {
		return RecordResult{}, err
	}
	return RecordResult{Data: data, Meta: meta}, nil
}

func (s CRUDService) save(ctx context.Context, cc *CompiledController, id any, in RecordInput, update bool) (RecordResult, error) {
	if s.DB == nil {
		return RecordResult{}, errors.New("cabana: database is not configured")
	}
	if ctx == nil {
		ctx = context.Background()
	}
	if _, err := newWritableModel(cc); err != nil {
		return RecordResult{}, err
	}
	op := "create"
	if update {
		op = "update"
	}
	// Writable relation keys are lifted before scalar projection (which drops
	// every nested value); only keys present in the body are applied.
	relations, err := liftRelationValues(cc, in.Body, op)
	if err != nil {
		return RecordResult{}, err
	}
	var result RecordResult
	err = s.DB.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
		tx = tx.WithContext(ctx)
		target, err := newWritableModel(cc)
		if err != nil {
			return err
		}
		if update {
			pk, err := coercePK(target, id)
			if err != nil {
				return err
			}
			if err := loadRecord(ctx, tx, cc, target, pk); err != nil {
				return err
			}
		}
		projected := projectOperation(cc, in.Body, op)
		if err := lagoon.Fill(target, fillAllowed(cc, target, op), projected, false); err != nil {
			return &CapabilityError{ControllerID: controllerID(cc)}
		}
		if hook, ok := target.(lagoon.HasBeforeValidate); ok && hook != nil {
			if err := hook.BeforeValidate(tx); err != nil {
				return &CapabilityError{ControllerID: controllerID(cc)}
			}
		}
		rules := mergedRules(cc, target)
		msgs, err := lagoon.Validate(ctx, tx, target, rules, valuesForRules(target, rules), nil)
		if err != nil {
			return &CapabilityError{ControllerID: controllerID(cc)}
		}
		if len(msgs) > 0 {
			return &ValidationError{Details: validationDetails(msgs)}
		}
		if update {
			err = formBeforeUpdate(ctx, cc, target)
		} else {
			err = formBeforeCreate(ctx, cc, target)
		}
		if err != nil {
			return err
		}
		// D-18: submitted ids pass the same scoped query as the options
		// endpoint; belongsTo keys land before the row write, pivot rows after.
		if err := checkRelationScope(ctx, tx, cc, relations); err != nil {
			return err
		}
		if err := assignBelongsTo(cc, target, relations); err != nil {
			return err
		}
		if update {
			err = tx.Save(target).Error
		} else {
			err = tx.Create(target).Error
		}
		if err != nil {
			return lifecycleFailure(cc, err)
		}
		if err := syncBelongsToMany(ctx, tx, cc, target, relations); err != nil {
			return err
		}
		if update {
			err = formAfterUpdate(ctx, cc, target)
		} else {
			err = formAfterCreate(ctx, cc, target)
		}
		if err != nil {
			return err
		}
		result, err = projectFullRecord(ctx, tx, cc, target)
		return err
	})
	if err != nil {
		return RecordResult{}, err
	}
	return result, nil
}

func writeCRUDError(w http.ResponseWriter, err error) {
	var ve *ValidationError
	if errors.As(err, &ve) {
		WriteErrorDetails(w, http.StatusUnprocessableEntity, "validation_failed", "Validation failed", ve.Details)
		return
	}
	var missing recordNotFound
	if errors.As(err, &missing) {
		WriteError(w, http.StatusNotFound, "not_found", msgNotFound)
		return
	}
	var partial partialSelection
	if errors.As(err, &partial) {
		WriteError(w, http.StatusConflict, "conflict", "Conflict")
		return
	}
	WriteError(w, http.StatusInternalServerError, "error", msgServerError)
}

func newWritableModel(cc *CompiledController) (any, error) {
	id := controllerID(cc)
	if cc == nil || cc.Controller == nil {
		return nil, &CapabilityError{ControllerID: id}
	}
	src, ok := cc.Controller.(pact.AdminRecordSource)
	if !ok || src == nil {
		return nil, &CapabilityError{ControllerID: id}
	}
	model := src.NewRecord()
	if model == nil {
		return nil, &CapabilityError{ControllerID: id}
	}
	if _, ok := model.(lagoon.HasFillable); !ok {
		return nil, &CapabilityError{ControllerID: id}
	}
	if _, ok := model.(hasRules); !ok {
		return nil, &CapabilityError{ControllerID: id}
	}
	return model, nil
}

func controllerID(cc *CompiledController) string {
	if cc == nil || cc.Controller == nil {
		return ""
	}
	return cc.Controller.ID()
}

func loadRecord(ctx context.Context, tx *gorm.DB, cc *CompiledController, dest any, pk any) error {
	col := primaryColumn(dest)
	q := tx.WithContext(ctx)
	if cc != nil {
		if ext, ok := cc.Controller.(pact.FormExtendQuery); ok && ext != nil {
			if next := ext.FormExtendQuery(ctx, q); next != nil {
				q = next
			}
		}
	}
	err := q.Clauses(clause.Locking{Strength: "UPDATE"}).
		Where(clause.Eq{Column: clause.Column{Name: col}, Value: pk}).
		Take(dest).Error
	if errors.Is(err, gorm.ErrRecordNotFound) {
		return recordNotFound{}
	}
	if err != nil {
		return lifecycleFailure(cc, err)
	}
	return nil
}

type lifecycleError struct {
	ControllerID string
}

func (e *lifecycleError) Error() string {
	if e == nil {
		return "cabana: lifecycle failed"
	}
	return "cabana: controller " + e.ControllerID + " failed"
}

func lifecycleFailure(cc *CompiledController, err error) error {
	if err == nil {
		return nil
	}
	var missing recordNotFound
	if errors.As(err, &missing) {
		return err
	}
	var invalid *ValidationError
	if errors.As(err, &invalid) {
		return err
	}
	var closed *CapabilityError
	if errors.As(err, &closed) {
		return err
	}
	var partial partialSelection
	if errors.As(err, &partial) {
		return err
	}
	var life *lifecycleError
	if errors.As(err, &life) {
		return err
	}
	return &lifecycleError{ControllerID: controllerID(cc)}
}

type partialSelection struct{}

func (partialSelection) Error() string { return "cabana: partial selection" }

func normalizeIDs(raw []any) ([]uint, error) {
	if len(raw) == 0 {
		return nil, &ValidationError{Details: map[string]any{"ids": []string{"The ids field is required."}}}
	}
	seen := map[uint]struct{}{}
	ids := make([]uint, 0, len(raw))
	for _, item := range raw {
		n, err := asUint(item)
		if err != nil {
			return nil, &ValidationError{Details: map[string]any{"ids": []string{"The ids field must be a list of integers."}}}
		}
		if _, ok := seen[n]; ok {
			continue
		}
		seen[n] = struct{}{}
		ids = append(ids, n)
	}
	sort.Slice(ids, func(i, j int) bool { return ids[i] < ids[j] })
	return ids, nil
}

func lockScoped(ctx context.Context, tx *gorm.DB, cc *CompiledController, proto any, ids []uint) ([]any, error) {
	mt := reflect.TypeOf(proto)
	if mt == nil || mt.Kind() != reflect.Pointer || mt.Elem().Kind() != reflect.Struct {
		return nil, &CapabilityError{ControllerID: controllerID(cc)}
	}
	holder := reflect.New(reflect.SliceOf(mt.Elem()))
	q := tx.WithContext(ctx).Model(proto)
	if cc != nil {
		if ext, ok := cc.Controller.(pact.ListExtendQuery); ok && ext != nil {
			if next := ext.ListExtendQuery(ctx, q); next != nil {
				q = next
			}
		}
	}
	col := primaryColumn(proto)
	vals := make([]any, len(ids))
	for i, id := range ids {
		vals[i] = castPK(proto, id)
	}
	err := q.Clauses(clause.Locking{Strength: "UPDATE"}).
		Where(clause.IN{Column: clause.Column{Name: col}, Values: vals}).
		Order(clause.OrderByColumn{Column: clause.Column{Name: col}, Desc: false}).
		Find(holder.Interface()).Error
	if err != nil {
		return nil, lifecycleFailure(cc, err)
	}
	values := holder.Elem()
	out := make([]any, values.Len())
	for i := 0; i < values.Len(); i++ {
		out[i] = values.Index(i).Addr().Interface()
	}
	sort.SliceStable(out, func(i, j int) bool { return pkUint(out[i]) < pkUint(out[j]) })
	return out, nil
}

func pkUint(model any) uint {
	v := reflect.ValueOf(model)
	for v.Kind() == reflect.Pointer {
		if v.IsNil() {
			return 0
		}
		v = v.Elem()
	}
	field := fieldByColumn(v, primaryColumn(model))
	if !field.IsValid() || !field.CanInterface() {
		return 0
	}
	n, err := asUint(field.Interface())
	if err != nil {
		return 0
	}
	return n
}

func formBeforeCreate(ctx context.Context, cc *CompiledController, model any) error {
	hook, ok := cc.Controller.(pact.FormBeforeCreate)
	if !ok || hook == nil {
		return nil
	}
	return lifecycleFailure(cc, hook.FormBeforeCreate(ctx, model))
}

func formAfterCreate(ctx context.Context, cc *CompiledController, model any) error {
	hook, ok := cc.Controller.(pact.FormAfterCreate)
	if !ok || hook == nil {
		return nil
	}
	return lifecycleFailure(cc, hook.FormAfterCreate(ctx, model))
}

func formBeforeUpdate(ctx context.Context, cc *CompiledController, model any) error {
	hook, ok := cc.Controller.(pact.FormBeforeUpdate)
	if !ok || hook == nil {
		return nil
	}
	return lifecycleFailure(cc, hook.FormBeforeUpdate(ctx, model))
}

func formAfterUpdate(ctx context.Context, cc *CompiledController, model any) error {
	hook, ok := cc.Controller.(pact.FormAfterUpdate)
	if !ok || hook == nil {
		return nil
	}
	return lifecycleFailure(cc, hook.FormAfterUpdate(ctx, model))
}

func deleteRecord(ctx context.Context, tx *gorm.DB, cc *CompiledController, model any) error {
	if hook, ok := cc.Controller.(pact.FormBeforeDelete); ok && hook != nil {
		if err := lifecycleFailure(cc, hook.FormBeforeDelete(ctx, model)); err != nil {
			return err
		}
	}
	if err := tx.WithContext(ctx).Delete(model).Error; err != nil {
		return lifecycleFailure(cc, err)
	}
	if hook, ok := cc.Controller.(pact.FormAfterDelete); ok && hook != nil {
		if err := lifecycleFailure(cc, hook.FormAfterDelete(ctx, model)); err != nil {
			return err
		}
	}
	return nil
}

func decodeObject(r *http.Request) (map[string]any, error) {
	dec := json.NewDecoder(r.Body)
	dec.UseNumber()
	var body map[string]any
	if err := dec.Decode(&body); err != nil {
		return nil, &ValidationError{Details: map[string]any{"body": []string{"The request body is invalid."}}}
	}
	if body == nil {
		body = map[string]any{}
	}
	return body, nil
}

func pathID(r *http.Request) (uint, error) {
	raw := strings.TrimSpace(r.PathValue("id"))
	n, err := strconv.ParseUint(raw, 10, 64)
	if raw == "" || err != nil {
		return 0, &ValidationError{Details: map[string]any{"id": []string{"The id field must be an integer."}}}
	}
	return uint(n), nil
}

func projectOperation(cc *CompiledController, body map[string]any, op string) map[string]any {
	projected := ProjectWritableFields(cc, body)
	if op == "" || cc == nil {
		return projected
	}
	filtered := map[string]any{}
	for _, field := range cc.Writable {
		if !contextAllows(cc, field.Name, op) {
			continue
		}
		if val, ok := projected[field.FillKey]; ok {
			filtered[field.FillKey] = val
		}
	}
	return filtered
}

func fillAllowed(cc *CompiledController, model any, op string) []string {
	fillable, ok := model.(lagoon.HasFillable)
	if !ok || fillable == nil {
		return nil
	}
	allowed := map[string]struct{}{}
	for _, key := range fillable.Fillable() {
		if !protectedFillKey(key) {
			allowed[key] = struct{}{}
		}
	}
	out := make([]string, 0, len(allowed))
	if cc == nil {
		return out
	}
	for _, field := range cc.Writable {
		if protectedFillKey(field.FillKey) {
			continue
		}
		if _, ok := allowed[field.FillKey]; !ok || !contextAllows(cc, field.Name, op) {
			continue
		}
		out = append(out, field.FillKey)
	}
	return out
}

func mergedRules(cc *CompiledController, model any) map[string]string {
	out := map[string]string{}
	if rules, ok := model.(hasRules); ok && rules != nil {
		for key, rule := range rules.Rules() {
			out[key] = rule
		}
	}
	if cc == nil || cc.Form == nil {
		return out
	}
	for _, field := range cc.Form.Fields {
		// Relation fields are not writable columns. required stays on the
		// schema for the client, but it cannot be checked by Fill.
		if field.Required && scalarFormField(field.Type) {
			out[field.Name] = mergeRequired(out[field.Name])
		}
	}
	return out
}

func mergeRequired(rule string) string {
	if strings.TrimSpace(rule) == "" {
		return "required"
	}
	for _, tok := range strings.Split(rule, "|") {
		name, _, _ := strings.Cut(strings.TrimSpace(tok), ":")
		if name == "required" {
			return rule
		}
	}
	return rule + "|required"
}

func valuesForRules(model any, rules map[string]string) map[string]any {
	v := reflect.ValueOf(model)
	for v.Kind() == reflect.Pointer {
		if v.IsNil() {
			return map[string]any{}
		}
		v = v.Elem()
	}
	out := map[string]any{}
	for field := range rules {
		f := fieldByColumn(v, field)
		if f.IsValid() && f.CanInterface() {
			out[field] = f.Interface()
		}
	}
	return out
}

func validationDetails(msgs map[string][]string) map[string]any {
	out := make(map[string]any, len(msgs))
	for key, messages := range msgs {
		out[key] = messages
	}
	return out
}

func projectRecord(cc *CompiledController, model any) map[string]any {
	v := reflect.ValueOf(model)
	for v.Kind() == reflect.Pointer {
		if v.IsNil() {
			return map[string]any{}
		}
		v = v.Elem()
	}
	out := map[string]any{}
	if id := fieldByColumn(v, primaryColumn(model)); id.IsValid() && id.CanInterface() {
		out["id"] = id.Interface()
	}
	if cc == nil {
		return out
	}
	for _, field := range cc.Writable {
		if protectedFillKey(field.FillKey) {
			continue
		}
		f := fieldByColumn(v, field.FillKey)
		if f.IsValid() && f.CanInterface() {
			out[field.Name] = f.Interface()
		}
	}
	return out
}

func modelColumns(model any) map[string]struct{} {
	t := reflect.TypeOf(model)
	for t != nil && t.Kind() == reflect.Pointer {
		t = t.Elem()
	}
	cols := map[string]struct{}{}
	if t == nil || t.Kind() != reflect.Struct {
		return cols
	}
	for i := 0; i < t.NumField(); i++ {
		field := t.Field(i)
		if field.PkgPath != "" {
			continue
		}
		name := gormColumn(field)
		if name != "" {
			cols[name] = struct{}{}
		}
	}
	return cols
}

func scalarFormField(typ string) bool {
	switch typ {
	case "text", "textarea", "number", "checkbox", "switch", "dropdown":
		return true
	default:
		return false
	}
}

func protectedFillKey(key string) bool {
	switch strings.ToLower(key) {
	case "id", "created_at", "updated_at", "deleted_at",
		"owner_id", "user_id", "collection_id", "organisation_id", "organization_id",
		"scope_id", "role_id", "permissions",
		"is_superuser", "is_system", "is_activated", "password":
		return true
	default:
		return false
	}
}

func nestedValue(val any) bool {
	switch val.(type) {
	case map[string]any, []any:
		return true
	default:
		return false
	}
}

func contextAllows(cc *CompiledController, name, op string) bool {
	if op == "" || cc == nil || cc.Form == nil {
		return true
	}
	for _, field := range cc.Form.Fields {
		if field.Name != name {
			continue
		}
		if field.Context == nil || len(field.Context.values) == 0 {
			return true
		}
		for _, value := range field.Context.values {
			if value == op {
				return true
			}
		}
		return false
	}
	return true
}

func coercePK(model any, id any) (any, error) {
	n, err := asUint(id)
	if err != nil {
		return nil, &ValidationError{Details: map[string]any{"id": []string{"The id field must be an integer."}}}
	}
	return castPK(model, n), nil
}

func castPK(model any, n uint) any {
	t := reflect.TypeOf(model)
	for t != nil && t.Kind() == reflect.Pointer {
		t = t.Elem()
	}
	if t == nil || t.Kind() != reflect.Struct {
		return n
	}
	for i := 0; i < t.NumField(); i++ {
		field := t.Field(i)
		if !strings.Contains(field.Tag.Get("gorm"), "primaryKey") {
			continue
		}
		switch field.Type.Kind() {
		case reflect.Uint:
			return uint(n)
		case reflect.Uint32:
			return uint32(n)
		case reflect.Uint64:
			return uint64(n)
		case reflect.Int:
			return int(n)
		case reflect.Int64:
			return int64(n)
		case reflect.String:
			return strconv.FormatUint(uint64(n), 10)
		default:
			return n
		}
	}
	return n
}

func asUint(id any) (uint, error) {
	switch n := id.(type) {
	case uint:
		return n, nil
	case uint32:
		return uint(n), nil
	case uint64:
		if uint64(uint(n)) != n {
			return 0, errBadID
		}
		return uint(n), nil
	case int:
		if n < 0 {
			return 0, errBadID
		}
		return uint(n), nil
	case int64:
		if n < 0 {
			return 0, errBadID
		}
		return uint(n), nil
	case float64:
		if n < 0 || n != math.Trunc(n) || n > math.MaxUint32 && strconv.IntSize == 32 {
			return 0, errBadID
		}
		return uint(n), nil
	case json.Number:
		i, err := n.Int64()
		if err != nil || i < 0 {
			return 0, errBadID
		}
		return uint(i), nil
	case string:
		i, err := strconv.ParseUint(n, 10, 64)
		if err != nil {
			return 0, errBadID
		}
		return uint(i), nil
	default:
		return 0, errBadID
	}
}

var errBadID = errors.New("cabana: bad id")