package http

import (
	"bytes"
	"encoding/base64"
	"io/ioutil"
	"mime/multipart"
	"net/http"
	"net/http/httptest"
	"net/url"
	"testing"

	"elyby/minecraft-skinsystem/auth"
	"elyby/minecraft-skinsystem/db"

	"github.com/golang/mock/gomock"
	testify "github.com/stretchr/testify/assert"
)

func TestConfig_PostSkin_Valid(t *testing.T) {
	assert := testify.New(t)

	ctrl := gomock.NewController(t)
	defer ctrl.Finish()

	config, mocks := setupMocks(ctrl)

	resultModel := createSkinModel("mock_user", false)
	resultModel.SkinId = 5
	resultModel.Hash = "94a457d92a61460cb9cb5d6f29732d2a"
	resultModel.Url = "http://ely.by/minecraft/skins/default.png"
	resultModel.MojangTextures = ""
	resultModel.MojangSignature = ""

	mocks.Auth.EXPECT().Check(gomock.Any()).Return(nil)
	mocks.Skins.EXPECT().FindByUserId(1).Return(createSkinModel("mock_user", false), nil)
	mocks.Skins.EXPECT().Save(resultModel).Return(nil)
	mocks.Log.EXPECT().IncCounter("authentication.challenge", int64(1))
	mocks.Log.EXPECT().IncCounter("authentication.success", int64(1))
	mocks.Log.EXPECT().IncCounter("api.skins.post.request", int64(1))
	mocks.Log.EXPECT().IncCounter("api.skins.post.success", int64(1))

	form := url.Values{
		"identityId": {"1"},
		"username":   {"mock_user"},
		"uuid":       {"0f657aa8-bfbe-415d-b700-5750090d3af3"},
		"skinId":     {"5"},
		"hash":       {"94a457d92a61460cb9cb5d6f29732d2a"},
		"is1_8":      {"0"},
		"isSlim":     {"0"},
		"url":        {"http://ely.by/minecraft/skins/default.png"},
	}

	req := httptest.NewRequest("POST", "http://skinsystem.ely.by/api/skins", bytes.NewBufferString(form.Encode()))
	req.Header.Add("Content-Type", "application/x-www-form-urlencoded")
	w := httptest.NewRecorder()

	config.CreateHandler().ServeHTTP(w, req)

	resp := w.Result()
	defer resp.Body.Close()
	assert.Equal(201, resp.StatusCode)
	response, _ := ioutil.ReadAll(resp.Body)
	assert.Empty(response)
}

func TestConfig_PostSkin_ChangedIdentityId(t *testing.T) {
	assert := testify.New(t)

	ctrl := gomock.NewController(t)
	defer ctrl.Finish()

	config, mocks := setupMocks(ctrl)

	resultModel := createSkinModel("mock_user", false)
	resultModel.UserId = 2
	resultModel.SkinId = 5
	resultModel.Hash = "94a457d92a61460cb9cb5d6f29732d2a"
	resultModel.Url = "http://ely.by/minecraft/skins/default.png"
	resultModel.MojangTextures = ""
	resultModel.MojangSignature = ""

	form := url.Values{
		"identityId": {"2"},
		"username":   {"mock_user"},
		"uuid":       {"0f657aa8-bfbe-415d-b700-5750090d3af3"},
		"skinId":     {"5"},
		"hash":       {"94a457d92a61460cb9cb5d6f29732d2a"},
		"is1_8":      {"0"},
		"isSlim":     {"0"},
		"url":        {"http://ely.by/minecraft/skins/default.png"},
	}

	req := httptest.NewRequest("POST", "http://skinsystem.ely.by/api/skins", bytes.NewBufferString(form.Encode()))
	req.Header.Add("Content-Type", "application/x-www-form-urlencoded")
	w := httptest.NewRecorder()

	mocks.Auth.EXPECT().Check(gomock.Any()).Return(nil)
	mocks.Skins.EXPECT().FindByUserId(2).Return(nil, &db.SkinNotFoundError{"unknown"})
	mocks.Skins.EXPECT().FindByUsername("mock_user").Return(createSkinModel("mock_user", false), nil)
	mocks.Skins.EXPECT().RemoveByUsername("mock_user").Return(nil)
	mocks.Skins.EXPECT().Save(resultModel).Return(nil)
	mocks.Log.EXPECT().IncCounter("authentication.challenge", int64(1))
	mocks.Log.EXPECT().IncCounter("authentication.success", int64(1))
	mocks.Log.EXPECT().IncCounter("api.skins.post.request", int64(1))
	mocks.Log.EXPECT().IncCounter("api.skins.post.success", int64(1))

	config.CreateHandler().ServeHTTP(w, req)

	resp := w.Result()
	defer resp.Body.Close()
	assert.Equal(201, resp.StatusCode)
	response, _ := ioutil.ReadAll(resp.Body)
	assert.Empty(response)
}

func TestConfig_PostSkin_ChangedUsername(t *testing.T) {
	assert := testify.New(t)

	ctrl := gomock.NewController(t)
	defer ctrl.Finish()

	config, mocks := setupMocks(ctrl)

	resultModel := createSkinModel("changed_username", false)
	resultModel.SkinId = 5
	resultModel.Hash = "94a457d92a61460cb9cb5d6f29732d2a"
	resultModel.Url = "http://ely.by/minecraft/skins/default.png"
	resultModel.MojangTextures = ""
	resultModel.MojangSignature = ""

	form := url.Values{
		"identityId": {"1"},
		"username":   {"changed_username"},
		"uuid":       {"0f657aa8-bfbe-415d-b700-5750090d3af3"},
		"skinId":     {"5"},
		"hash":       {"94a457d92a61460cb9cb5d6f29732d2a"},
		"is1_8":      {"0"},
		"isSlim":     {"0"},
		"url":        {"http://ely.by/minecraft/skins/default.png"},
	}

	req := httptest.NewRequest("POST", "http://skinsystem.ely.by/api/skins", bytes.NewBufferString(form.Encode()))
	req.Header.Add("Content-Type", "application/x-www-form-urlencoded")
	w := httptest.NewRecorder()

	mocks.Auth.EXPECT().Check(gomock.Any()).Return(nil)
	mocks.Skins.EXPECT().FindByUserId(1).Return(createSkinModel("mock_user", false), nil)
	mocks.Skins.EXPECT().RemoveByUserId(1).Return(nil)
	mocks.Skins.EXPECT().Save(resultModel).Return(nil)
	mocks.Log.EXPECT().IncCounter("authentication.challenge", int64(1))
	mocks.Log.EXPECT().IncCounter("authentication.success", int64(1))
	mocks.Log.EXPECT().IncCounter("api.skins.post.request", int64(1))
	mocks.Log.EXPECT().IncCounter("api.skins.post.success", int64(1))

	config.CreateHandler().ServeHTTP(w, req)

	resp := w.Result()
	defer resp.Body.Close()
	assert.Equal(201, resp.StatusCode)
	response, _ := ioutil.ReadAll(resp.Body)
	assert.Empty(response)
}

func TestConfig_PostSkin_CompletelyNewIdentity(t *testing.T) {
	assert := testify.New(t)

	ctrl := gomock.NewController(t)
	defer ctrl.Finish()

	config, mocks := setupMocks(ctrl)

	resultModel := createSkinModel("mock_user", false)
	resultModel.SkinId = 5
	resultModel.Hash = "94a457d92a61460cb9cb5d6f29732d2a"
	resultModel.Url = "http://ely.by/minecraft/skins/default.png"
	resultModel.MojangTextures = ""
	resultModel.MojangSignature = ""

	form := url.Values{
		"identityId": {"1"},
		"username":   {"mock_user"},
		"uuid":       {"0f657aa8-bfbe-415d-b700-5750090d3af3"},
		"skinId":     {"5"},
		"hash":       {"94a457d92a61460cb9cb5d6f29732d2a"},
		"is1_8":      {"0"},
		"isSlim":     {"0"},
		"url":        {"http://ely.by/minecraft/skins/default.png"},
	}

	req := httptest.NewRequest("POST", "http://skinsystem.ely.by/api/skins", bytes.NewBufferString(form.Encode()))
	req.Header.Add("Content-Type", "application/x-www-form-urlencoded")
	w := httptest.NewRecorder()

	mocks.Auth.EXPECT().Check(gomock.Any()).Return(nil)
	mocks.Skins.EXPECT().FindByUserId(1).Return(nil, &db.SkinNotFoundError{"unknown"})
	mocks.Skins.EXPECT().FindByUsername("mock_user").Return(nil, &db.SkinNotFoundError{"mock_user"})
	mocks.Skins.EXPECT().Save(resultModel).Return(nil)
	mocks.Log.EXPECT().IncCounter("authentication.challenge", int64(1))
	mocks.Log.EXPECT().IncCounter("authentication.success", int64(1))
	mocks.Log.EXPECT().IncCounter("api.skins.post.request", int64(1))
	mocks.Log.EXPECT().IncCounter("api.skins.post.success", int64(1))

	config.CreateHandler().ServeHTTP(w, req)

	resp := w.Result()
	defer resp.Body.Close()
	assert.Equal(201, resp.StatusCode)
	response, _ := ioutil.ReadAll(resp.Body)
	assert.Empty(response)
}

func TestConfig_PostSkin_UploadSkin(t *testing.T) {
	assert := testify.New(t)

	ctrl := gomock.NewController(t)
	defer ctrl.Finish()

	config, mocks := setupMocks(ctrl)

	body := &bytes.Buffer{}
	writer := multipart.NewWriter(body)

	part, _ := writer.CreateFormFile("skin", "char.png")
	part.Write(loadSkinFile())

	_ = writer.WriteField("identityId", "1")
	_ = writer.WriteField("username", "mock_user")
	_ = writer.WriteField("uuid", "0f657aa8-bfbe-415d-b700-5750090d3af3")
	_ = writer.WriteField("skinId", "5")

	err := writer.Close()
	if err != nil {
		panic(err)
	}

	req := httptest.NewRequest("POST", "http://skinsystem.ely.by/api/skins", body)
	req.Header.Add("Content-Type", writer.FormDataContentType())
	w := httptest.NewRecorder()

	mocks.Auth.EXPECT().Check(gomock.Any()).Return(nil)
	mocks.Log.EXPECT().IncCounter("authentication.challenge", int64(1))
	mocks.Log.EXPECT().IncCounter("authentication.success", int64(1))
	mocks.Log.EXPECT().IncCounter("api.skins.post.request", int64(1))
	mocks.Log.EXPECT().IncCounter("api.skins.post.validation_failed", int64(1))

	config.CreateHandler().ServeHTTP(w, req)

	resp := w.Result()
	defer resp.Body.Close()
	assert.Equal(400, resp.StatusCode)
	response, _ := ioutil.ReadAll(resp.Body)
	assert.JSONEq(`{
		"errors": {
			"skin": [
			    "Skin uploading is temporary unavailable"
			]
		}
	}`, string(response))
}

func TestConfig_PostSkin_RequiredFields(t *testing.T) {
	assert := testify.New(t)

	ctrl := gomock.NewController(t)
	defer ctrl.Finish()

	config, mocks := setupMocks(ctrl)

	form := url.Values{
		"hash":           {"this is not md5"},
		"mojangTextures": {"someBase64EncodedString"},
	}

	req := httptest.NewRequest("POST", "http://skinsystem.ely.by/api/skins", bytes.NewBufferString(form.Encode()))
	req.Header.Add("Content-Type", "application/x-www-form-urlencoded")
	w := httptest.NewRecorder()

	mocks.Auth.EXPECT().Check(gomock.Any()).Return(nil)
	mocks.Log.EXPECT().IncCounter("authentication.challenge", int64(1))
	mocks.Log.EXPECT().IncCounter("authentication.success", int64(1))
	mocks.Log.EXPECT().IncCounter("api.skins.post.request", int64(1))
	mocks.Log.EXPECT().IncCounter("api.skins.post.validation_failed", int64(1))

	config.CreateHandler().ServeHTTP(w, req)

	resp := w.Result()
	defer resp.Body.Close()
	assert.Equal(400, resp.StatusCode)
	response, _ := ioutil.ReadAll(resp.Body)
	assert.JSONEq(`{
		"errors": {
			"identityId": [
			    "The identityId field is required",
				"The identityId field must be numeric",
				"The identityId field must be minimum 1 char"
			],
            "skinId": [
				"The skinId field is required",
				"The skinId field must be numeric",
				"The skinId field must be minimum 1 char"
			],
			"username": [
				"The username field is required"
			],
			"uuid": [
				"The uuid field is required",
				"The uuid field must contain valid UUID"
			],
			"hash": [
				"The hash field must be a valid md5 hash"
			],
			"url": [
				"One of url or skin should be provided, but not both"
			],
			"skin": [
				"One of url or skin should be provided, but not both"
			],
			"mojangSignature": [
				"The mojangSignature field is required"
			]
		}
	}`, string(response))
}

func TestConfig_PostSkin_Unauthorized(t *testing.T) {
	assert := testify.New(t)

	ctrl := gomock.NewController(t)
	defer ctrl.Finish()

	config, mocks := setupMocks(ctrl)

	req := httptest.NewRequest("POST", "http://skinsystem.ely.by/api/skins", nil)
	req.Header.Add("Authorization", "Bearer invalid.jwt.token")
	w := httptest.NewRecorder()

	mocks.Auth.EXPECT().Check(gomock.Any()).Return(&auth.Unauthorized{"Cannot parse passed JWT token"})
	mocks.Log.EXPECT().IncCounter("authentication.challenge", int64(1))
	mocks.Log.EXPECT().IncCounter("authentication.failed", int64(1))

	config.CreateHandler().ServeHTTP(w, req)

	resp := w.Result()
	defer resp.Body.Close()
	assert.Equal(403, resp.StatusCode)
	response, _ := ioutil.ReadAll(resp.Body)
	assert.JSONEq(`[
		"Cannot parse passed JWT token"
	]`, string(response))
}

func TestConfig_DeleteSkinByUserId_Success(t *testing.T) {
	assert := testify.New(t)

	ctrl := gomock.NewController(t)
	defer ctrl.Finish()

	config, mocks := setupMocks(ctrl)

	req := httptest.NewRequest("DELETE", "http://skinsystem.ely.by/api/skins/id:1", nil)
	w := httptest.NewRecorder()

	mocks.Auth.EXPECT().Check(gomock.Any()).Return(nil)
	mocks.Skins.EXPECT().FindByUserId(1).Return(createSkinModel("mock_user", false), nil)
	mocks.Skins.EXPECT().RemoveByUserId(1).Return(nil)
	mocks.Log.EXPECT().IncCounter("authentication.challenge", int64(1))
	mocks.Log.EXPECT().IncCounter("authentication.success", int64(1))
	mocks.Log.EXPECT().IncCounter("api.skins.delete.request", int64(1))
	mocks.Log.EXPECT().IncCounter("api.skins.delete.success", int64(1))

	config.CreateHandler().ServeHTTP(w, req)

	resp := w.Result()
	defer resp.Body.Close()
	assert.Equal(204, resp.StatusCode)
	response, _ := ioutil.ReadAll(resp.Body)
	assert.Empty(response)
}

func TestConfig_DeleteSkinByUserId_NotFound(t *testing.T) {
	assert := testify.New(t)

	ctrl := gomock.NewController(t)
	defer ctrl.Finish()

	config, mocks := setupMocks(ctrl)

	req := httptest.NewRequest("DELETE", "http://skinsystem.ely.by/api/skins/id:2", nil)
	w := httptest.NewRecorder()

	mocks.Auth.EXPECT().Check(gomock.Any()).Return(nil)
	mocks.Skins.EXPECT().FindByUserId(2).Return(nil, &db.SkinNotFoundError{"unknown"})
	mocks.Log.EXPECT().IncCounter("authentication.challenge", int64(1))
	mocks.Log.EXPECT().IncCounter("authentication.success", int64(1))
	mocks.Log.EXPECT().IncCounter("api.skins.delete.request", int64(1))
	mocks.Log.EXPECT().IncCounter("api.skins.delete.not_found", int64(1))

	config.CreateHandler().ServeHTTP(w, req)

	resp := w.Result()
	defer resp.Body.Close()
	assert.Equal(404, resp.StatusCode)
	response, _ := ioutil.ReadAll(resp.Body)
	assert.JSONEq(`[
		"Cannot find record for requested user id"
	]`, string(response))
}

func TestConfig_DeleteSkinByUsername_Success(t *testing.T) {
	assert := testify.New(t)

	ctrl := gomock.NewController(t)
	defer ctrl.Finish()

	config, mocks := setupMocks(ctrl)

	req := httptest.NewRequest("DELETE", "http://skinsystem.ely.by/api/skins/mock_user", nil)
	w := httptest.NewRecorder()

	mocks.Auth.EXPECT().Check(gomock.Any()).Return(nil)
	mocks.Skins.EXPECT().FindByUsername("mock_user").Return(createSkinModel("mock_user", false), nil)
	mocks.Skins.EXPECT().RemoveByUserId(1).Return(nil)
	mocks.Log.EXPECT().IncCounter("authentication.challenge", int64(1))
	mocks.Log.EXPECT().IncCounter("authentication.success", int64(1))
	mocks.Log.EXPECT().IncCounter("api.skins.delete.request", int64(1))
	mocks.Log.EXPECT().IncCounter("api.skins.delete.success", int64(1))

	config.CreateHandler().ServeHTTP(w, req)

	resp := w.Result()
	defer resp.Body.Close()
	assert.Equal(204, resp.StatusCode)
	response, _ := ioutil.ReadAll(resp.Body)
	assert.Empty(response)
}

func TestConfig_DeleteSkinByUsername_NotFound(t *testing.T) {
	assert := testify.New(t)

	ctrl := gomock.NewController(t)
	defer ctrl.Finish()

	config, mocks := setupMocks(ctrl)

	req := httptest.NewRequest("DELETE", "http://skinsystem.ely.by/api/skins/mock_user_2", nil)
	w := httptest.NewRecorder()

	mocks.Auth.EXPECT().Check(gomock.Any()).Return(nil)
	mocks.Skins.EXPECT().FindByUsername("mock_user_2").Return(nil, &db.SkinNotFoundError{"mock_user_2"})
	mocks.Log.EXPECT().IncCounter("authentication.challenge", int64(1))
	mocks.Log.EXPECT().IncCounter("authentication.success", int64(1))
	mocks.Log.EXPECT().IncCounter("api.skins.delete.request", int64(1))
	mocks.Log.EXPECT().IncCounter("api.skins.delete.not_found", int64(1))

	config.CreateHandler().ServeHTTP(w, req)

	resp := w.Result()
	defer resp.Body.Close()
	assert.Equal(404, resp.StatusCode)
	response, _ := ioutil.ReadAll(resp.Body)
	assert.JSONEq(`[
		"Cannot find record for requested username"
	]`, string(response))
}

func TestConfig_Authenticate_SignatureKeyNotSet(t *testing.T) {
	assert := testify.New(t)

	ctrl := gomock.NewController(t)
	defer ctrl.Finish()

	config, mocks := setupMocks(ctrl)

	req := httptest.NewRequest("POST", "http://localhost", nil)
	w := httptest.NewRecorder()

	mocks.Auth.EXPECT().Check(gomock.Any()).Return(&auth.SigningKeyNotAvailable{})
	mocks.Log.EXPECT().Error("Unknown error on validating api request: :err", gomock.Any())
	mocks.Log.EXPECT().IncCounter("authentication.challenge", int64(1))

	res := config.Authenticate(http.HandlerFunc(func (resp http.ResponseWriter, req *http.Request) {}))
	res.ServeHTTP(w, req)

	resp := w.Result()
	defer resp.Body.Close()
	assert.Equal(500, resp.StatusCode)
	response, _ := ioutil.ReadAll(resp.Body)
	assert.Empty(response)
}

// base64 https://github.com/mathiasbynens/small/blob/0ca3c51/png-transparent.png
var OnePxPng = []byte("iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==")

func loadSkinFile() []byte {
	result := make([]byte, 92)
	_, err := base64.StdEncoding.Decode(result, OnePxPng)
	if err != nil {
		panic(err)
	}

	return result
}