package cabana

import (
	"context"
	"errors"
	"net/http"

	"gorm.io/gorm"
)

// 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 {
	return "cabana: controller " + e.ControllerID + ": missing Fill/Validate capability"
}

var errCRUDNotReady = errors.New("cabana: crud is not implemented")

// ProjectWritableFields copies only activation-bound writable keys.
func ProjectWritableFields(cc *CompiledController, body map[string]any) map[string]any {
	return nil
}

// BindWritableFields records schema field names onto model fill keys.
func BindWritableFields(cc *CompiledController) error {
	return errCRUDNotReady
}

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

// 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) {
	return nil, errCRUDNotReady
}

func writeCRUDError(w http.ResponseWriter, err error) {
	WriteError(w, http.StatusInternalServerError, "error", msgServerError)
}