package sliderule_test

import (
	"bytes"
	"context"
	"io"
	"testing"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"

	sr "tildegit.org/tjp/sliderule"
	"tildegit.org/tjp/sliderule/gemini"
)

var h1 = sr.HandlerFunc(func(_ context.Context, _ *sr.Request) *sr.Response {
	return gemini.Success("", &bytes.Buffer{})
})

func mw1(h sr.Handler) sr.Handler {
	return sr.HandlerFunc(func(ctx context.Context, req *sr.Request) *sr.Response {
		resp := h.Handle(ctx, req)
		resp.Body = io.MultiReader(resp.Body, bytes.NewBufferString("\nmiddleware 1"))
		return resp
	})
}

func mw2(h sr.Handler) sr.Handler {
	return sr.HandlerFunc(func(ctx context.Context, req *sr.Request) *sr.Response {
		resp := h.Handle(ctx, req)
		resp.Body = io.MultiReader(resp.Body, bytes.NewBufferString("\nmiddleware 2"))
		return resp
	})
}

func TestRouterUse(t *testing.T) {
	r := &sr.Router{}
	r.Use(mw1)
	r.Use(mw2)
	r.Route("/", h1)

	request, err := gemini.ParseRequest(bytes.NewBufferString("/\r\n"))
	require.Nil(t, err)

	response := r.Handler(context.Background(), request)
	require.NotNil(t, response)

	body, err := io.ReadAll(response.Body)
	require.Nil(t, err)

	assert.Equal(t, "\nmiddleware 2\nmiddleware 1", string(body))
}

func TestRouterMount(t *testing.T) {
	outer := &sr.Router{}
	outer.Use(mw2)

	inner := &sr.Router{}
	inner.Use(mw1)
	inner.Route("/bar", h1)

	outer.Mount("/foo", inner)

	request, err := gemini.ParseRequest(bytes.NewBufferString("/foo/bar\r\n"))
	require.Nil(t, err)

	response := outer.Handler(context.Background(), request)
	require.NotNil(t, response)

	body, err := io.ReadAll(response.Body)
	require.Nil(t, err)

	assert.Equal(t, "\nmiddleware 1\nmiddleware 2", string(body))

	request, err = gemini.ParseRequest(bytes.NewBufferString("/foo\r\n"))
	require.Nil(t, err)

	response = outer.Handler(context.Background(), request)
	require.Nil(t, response)
}