package cdata

import (
	"errors"

	"git.blauwelle.com/go/crate/cerrors"
	"git.blauwelle.com/go/crate/runtimehelper"
)

const maximumFrames = 16

type Response[T any] struct {
	Data      T                     `json:"data,omitempty"`
	Code      cerrors.Code          `json:"code"`
	Message   string                `json:"message,omitempty"`
	Debug     string                `json:"debug,omitempty"`
	Traceback []runtimehelper.Frame `json:"traceback,omitempty"`
}

type PageData[T any] struct {
	List      []T `json:"list"`
	PageIndex int `json:"pageIndex"` // >=1
	PageSize  int `json:"pageSize"`  // >=1
	Total     int `json:"total"`     // maybe 0
}

func NewOkResponse[T any](data T) Response[T] {
	return Response[T]{
		Code: cerrors.CodeOK,
		Data: data,
	}
}

func NewResponseFromError(err error) Response[struct{}] {
	e := &cerrors.Error{}
	if !errors.As(err, &e) {
		response := Response[struct{}]{
			Code:    cerrors.CodeUnknown,
			Message: "未知错误",
		}
		if cerrors.FlagDebug {
			response.Debug = err.Error()
			response.Traceback = runtimehelper.Stack(1, maximumFrames)
		}
		return response
	}
	return Response[struct{}]{
		Code:      e.Code,
		Message:   e.Message,
		Debug:     e.Debug,
		Traceback: e.Traceback,
	}
}

func NewErrorResponse(code cerrors.Code, message string) Response[struct{}] {
	response := Response[struct{}]{
		Code:    code,
		Message: message,
	}
	if cerrors.FlagDebug {
		response.Traceback = runtimehelper.Stack(1, maximumFrames)
	}
	return response
}