package recovery // import "go.unistack.org/micro-wrapper-recovery/v3"

import (
	"context"
	"fmt"

	"go.unistack.org/micro/v3/errors"
	"go.unistack.org/micro/v3/server"
)

var (
	_ server.HandlerWrapper    = NewServerHandlerWrapper()
	_ server.SubscriberWrapper = NewServerSubscriberWrapper()
)

func NewOptions(opts ...Option) Options {
	options := Options{
		ServerHandlerFn:    DefaultServerHandlerFn,
		ServerSubscriberFn: DefaultServerSubscriberFn,
	}
	for _, o := range opts {
		o(&options)
	}
	return options
}

type Options struct {
	ServerHandlerFn    func(context.Context, server.Request, interface{}, error) error
	ServerSubscriberFn func(context.Context, server.Message, error) error
}

type Option func(*Options)

func ServerHandlerFn(fn func(context.Context, server.Request, interface{}, error) error) Option {
	return func(o *Options) {
		o.ServerHandlerFn = fn
	}
}

func ServerSubscriberFn(fn func(context.Context, server.Message, error) error) Option {
	return func(o *Options) {
		o.ServerSubscriberFn = fn
	}
}

var (
	DefaultServerHandlerFn = func(ctx context.Context, req server.Request, rsp interface{}, err error) error {
		return errors.BadRequest("", "%v", err)
	}
	DefaultServerSubscriberFn = func(ctx context.Context, req server.Message, err error) error {
		return errors.BadRequest("", "%v", err)
	}
)

type wrapper struct {
	opts Options
}

func NewServerHandlerWrapper(opts ...Option) server.HandlerWrapper {
	handler := &wrapper{opts: NewOptions(opts...)}
	return handler.HandlerFunc
}

func (w *wrapper) HandlerFunc(fn server.HandlerFunc) server.HandlerFunc {
	return func(ctx context.Context, req server.Request, rsp interface{}) (err error) {
		defer func() {
			r := recover()
			switch verr := r.(type) {
			case nil:
				return
			case error:
				err = w.opts.ServerHandlerFn(ctx, req, rsp, verr)
			default:
				err = w.opts.ServerHandlerFn(ctx, req, rsp, fmt.Errorf("%v", r))
			}
		}()
		err = fn(ctx, req, rsp)
		return err
	}
}

func NewServerSubscriberWrapper(opts ...Option) server.SubscriberWrapper {
	handler := &wrapper{opts: NewOptions(opts...)}
	return handler.SubscriberFunc
}

func (w *wrapper) SubscriberFunc(fn server.SubscriberFunc) server.SubscriberFunc {
	return func(ctx context.Context, msg server.Message) (err error) {
		defer func() {
			r := recover()
			switch verr := r.(type) {
			case nil:
				return
			case error:
				err = w.opts.ServerSubscriberFn(ctx, msg, verr)
			default:
				err = w.opts.ServerSubscriberFn(ctx, msg, fmt.Errorf("%v", r))
			}
		}()
		err = fn(ctx, msg)
		return err
	}
}

/*
func NewClientWrapper() client.Wrapper {
	return func(c client.Client) client.Client {
		handler := &wrapper{
			clientClient: c,
		}
		return handler
	}
}

func NewCallWrapper() client.CallWrapper {
	return func(fn client.CallFunc) client.CallFunc {
		handler := &wrapper{
			clientCallFunc: fn,
		}
		return handler.CallFunc
	}
}

func (w *wrapper) CallFunc(ctx context.Context, addr string, req client.Request, rsp interface{}, opts client.CallOptions) (err error) {
	defer func() {
		r := recover()
		switch verr := r.(type) {
		case nil:
			return
		case error:
			err = w.clientCallFunc(ctx, addr, req, rsp, opts, verr)
		default:
			err = w.clientCallFunc(ctx, addr, req, rsp, opts, fmt.Errorf("%v", r))
		}
	}()
	err = w.CallFunc(ctx, addr, req, rsp, opts)
	return err
}

func (w *wrapper) Call(ctx context.Context, req client.Request, rsp interface{}, opts ...client.CallOption) error {
	defer func() {
		r := recover()
		switch verr := r.(type) {
		case nil:
			return
		case error:
			err = w.clientClient.Call(ctx, addr, req, rsp, opts, verr)
		default:
			err = w.clientClient.Call(ctx, addr, req, rsp, opts, fmt.Errorf("%v", r))
		}
	}()
	err = w.clientClient.Call(ctx, req, rsp, opts...)
	return err
}

func (w *wrapper) Stream(ctx context.Context, req client.Request, opts ...client.CallOption) (client.Stream, error) {

	stream, err := w.Client.Stream(ctx, req, opts...)

	return stream, err
}

func (w *wrapper) Publish(ctx context.Context, p client.Message, opts ...client.PublishOption) error {

	err := w.Client.Publish(ctx, p, opts...)


	return err
}
*/