package fserr

import (
	"fmt"
	"io"
)

type fundamental struct {
	msg string
	*stack
}

func (f *fundamental) Error() string { return f.msg }

func (f *fundamental) Format(s fmt.State, verb rune) {
	switch verb {
	case 'v':
		if s.Flag('+') {
			io.WriteString(s, f.msg)
			f.stack.Format(s, verb)
			return
		}
		fallthrough
	case 's':
		io.WriteString(s, f.msg)
	case 'q':
		fmt.Fprintf(s, "%q", f.msg)
	}
}

type withStack struct {
	error
	*stack
}

func (w *withStack) Cause() error { return w.error }

func (w *withStack) Unwrap() error { return w.error }

func (w *withStack) Format(s fmt.State, verb rune) {
	switch verb {
	case 'v':
		if s.Flag('+') {
			if w.Cause() != nil {
				fmt.Fprintf(s, "%+v", w.Cause())
			}
			w.stack.Format(s, verb)
			return
		}
		fallthrough
	case 's':
		io.WriteString(s, w.Error())
	case 'q':
		fmt.Fprintf(s, "%q", w.Error())
	}
}

type withMessage struct {
	cause error
	msg   string
}

func (w *withMessage) Error() string { return w.msg }
func (w *withMessage) Cause() error  { return w.cause }
func (w *withMessage) Unwrap() error { return w.cause }
func (w *withMessage) Format(s fmt.State, verb rune) {
	switch verb {
	case 'v':
		if s.Flag('+') {
			io.WriteString(s, w.msg+"\n")
			if w.Cause() != nil {
				fmt.Fprintf(s, "%+v", w.Cause())
			}
			return
		}
		fallthrough
	case 's':
		io.WriteString(s, w.Error())
	case 'q':
		fmt.Fprintf(s, "%q", w.Error())
	}
}

type withCode struct {
	cause        error
	Msg          string `json:"msg"`
	HttpCode     int    `json:"httpCode"`
	BusinessCode int    `json:"businessCode"`
}

func (w *withCode) Error() string { return w.Msg }
func (w *withCode) Cause() error  { return w.cause }
func (w *withCode) Unwrap() error { return w.cause }
func (w *withCode) Format(s fmt.State, verb rune) {
	switch verb {
	case 'v':
		if s.Flag('+') {
			io.WriteString(s, w.Msg+"\n")
			if w.Cause() != nil {
				fmt.Fprintf(s, "%+v", w.Cause())
			}
			return
		}
		fallthrough
	case 's':
		io.WriteString(s, w.Error())
	case 'q':
		fmt.Fprintf(s, "%q", w.Error())
	}
}