package apperror

import (
	"api.qobiltu.id/validation"
	"fmt"
)

// AppError is a custom error type for the application.
type AppError struct {
	Code    string         // Optional: Error code for programmatic handling
	Message string         // Human-readable error message
	Err     error          // Underlying error, if any
	Details map[string]any // Optional: Additional details about the error
}

func (e AppError) Error() string {
	if e.Code != "" {
		return fmt.Sprintf("[%s] %s", e.Code, e.Message)
	}
	return e.Message
}

// NewAppError creates a new AppError.
func NewAppError(code, message string, err error, details map[string]any) error {
	return &AppError{
		Code:    code,
		Message: message,
		Err:     err,
		Details: details,
	}
}

// ValidationError represents errors related to data validation.
type ValidationError struct {
	Errors []validation.ErrorMessage // Structure to hold field and message of validation errors
}

func (e ValidationError) Error() string {
	return fmt.Sprintf("validation failed: %+v", e.Errors)
}

// NewValidationError creates a new ValidationError.
func NewValidationError(message string, errors []validation.ErrorMessage) error {
	return &AppError{
		Code:    "VALIDATION_ERROR",
		Message: message,
		Err:     ValidationError{Errors: errors},
	}
}

// InternalError represents unexpected errors within the application.
type InternalError struct {
	Message string
	Err     error
}

func (e InternalError) Error() string {
	return fmt.Sprintf("internal server error: %v", e.Err)
}

// NewInternalError creates a new InternalError wrapped in AppError.
func NewInternalError(message string, err error) error {
	return &AppError{
		Code:    "INTERNAL_ERROR",
		Message: message,
		Err:     InternalError{Message: message, Err: err},
	}
}

// ConflictError represents errors due to a conflict with the current state.
type ConflictError struct {
	Message string
	Err     error
}

func (e ConflictError) Error() string {
	return fmt.Sprintf("conflict: %s", e.Err)
}

// NewConflictError creates a new ConflictError wrapped in AppError.
func NewConflictError(message string, err error) error {
	return &AppError{
		Code:    "CONFLICT_ERROR",
		Message: message,
		Err:     ConflictError{Message: message, Err: err},
	}
}

// NotFoundError represents errors when a resource is not found.
type NotFoundError struct {
	Message  string
	Resource string
	ID       any
}

func (e NotFoundError) Error() string {
	return fmt.Sprintf("%s with ID '%v' not found", e.Resource, e.ID)
}

// NewNotFoundError creates a new NotFoundError wrapped in AppError.
func NewNotFoundError(resource string, id any) error {
	message := fmt.Sprintf("%s not found", resource)
	return &AppError{
		Code:    "NOT_FOUND_ERROR",
		Message: fmt.Sprintf("%s not found", resource),
		Err:     NotFoundError{Message: message, Resource: resource, ID: id},
		Details: map[string]any{
			"resource": resource,
			"id":       id,
		},
	}
}

// UnauthorizedError represents errors when access is denied due to lack of credentials.
type UnauthorizedError struct {
	Message string
	Err     error
}

func (e UnauthorizedError) Error() string {
	return fmt.Sprintf("unauthorized: %s", e.Err)
}

// NewUnauthorizedError creates a new UnauthorizedError wrapped in AppError.
func NewUnauthorizedError(message string, err error) error {
	return &AppError{
		Code:    "UNAUTHORIZED_ERROR",
		Message: message,
		Err:     UnauthorizedError{Message: message, Err: err},
	}
}

// ForbiddenError represents errors when access is denied even with valid credentials.
type ForbiddenError struct {
	Message string
	Err     error
}

func (e ForbiddenError) Error() string {
	return fmt.Sprintf("forbidden: %s", e.Err)
}

// NewForbiddenError creates a new ForbiddenError wrapped in AppError.
func NewForbiddenError(message string, err error) error {
	return &AppError{
		Code:    "FORBIDDEN_ERROR",
		Message: message,
		Err:     ForbiddenError{Message: message, Err: err},
	}
}

// BadRequestError represents errors due to an invalid request.
type BadRequestError struct {
	Message string
	Err     error
}

func (e BadRequestError) Error() string {
	return fmt.Sprintf("bad request: %s", e.Err)
}

func NewBadRequestError(message string, err error) error {
	return &AppError{
		Code:    "BAD_REQUEST_ERROR",
		Message: message,
		Err:     BadRequestError{Message: message, Err: err},
	}
}