package ginSwagger

import (
	"io/ioutil"
	"net/http"
	"net/http/httptest"
	"os"
	"testing"

	"github.com/gin-contrib/gzip"
	"github.com/swaggo/swag"

	"github.com/gin-gonic/gin"
	"github.com/stretchr/testify/assert"
	swaggerFiles "github.com/swaggo/files"
)

type mockedSwag struct{}

func (s *mockedSwag) ReadDoc() string {
	return `{
}`
}

func TestWrapHandler(t *testing.T) {
	gin.SetMode(gin.TestMode)
	router := gin.New()

	router.GET("/*any", WrapHandler(swaggerFiles.Handler, URL("https://github.com/swaggo/gin-swagger")))

	assert.Equal(t, http.StatusOK, performRequest("GET", "/index.html", router).Code)
}

func TestWrapCustomHandler(t *testing.T) {
	gin.SetMode(gin.TestMode)
	router := gin.New()

	router.Any("/*any", CustomWrapHandler(&Config{}, swaggerFiles.Handler))

	w1 := performRequest(http.MethodGet, "/index.html", router)
	assert.Equal(t, http.StatusOK, w1.Code)
	assert.Equal(t, w1.Header()["Content-Type"][0], "text/html; charset=utf-8")

	assert.Equal(t, http.StatusInternalServerError, performRequest(http.MethodGet, "/doc.json", router).Code)

	doc := &mockedSwag{}
	swag.Register(swag.Name, doc)

	w2 := performRequest(http.MethodGet, "/doc.json", router)
	assert.Equal(t, http.StatusOK, w2.Code)
	assert.Equal(t, w2.Header()["Content-Type"][0], "application/json; charset=utf-8")

	// Perform body rendering validation
	w2Body, err := ioutil.ReadAll(w2.Body)
	assert.NoError(t, err)
	assert.Equal(t, doc.ReadDoc(), string(w2Body))

	w3 := performRequest(http.MethodGet, "/favicon-16x16.png", router)
	assert.Equal(t, http.StatusOK, w3.Code)
	assert.Equal(t, w3.Header()["Content-Type"][0], "image/png")

	w4 := performRequest(http.MethodGet, "/swagger-ui.css", router)
	assert.Equal(t, http.StatusOK, w4.Code)
	assert.Equal(t, w4.Header()["Content-Type"][0], "text/css; charset=utf-8")

	w5 := performRequest(http.MethodGet, "/swagger-ui-bundle.js", router)
	assert.Equal(t, http.StatusOK, w5.Code)
	assert.Equal(t, w5.Header()["Content-Type"][0], "application/javascript")

	w6 := performRequest(http.MethodGet, "/index.css", router)
	assert.Equal(t, http.StatusOK, w6.Code)
	assert.Equal(t, w6.Header()["Content-Type"][0], "text/css; charset=utf-8")

	w7 := performRequest(http.MethodGet, "/swagger-initializer.js", router)
	assert.Equal(t, http.StatusOK, w7.Code)
	assert.Equal(t, w7.Header()["Content-Type"][0], "application/javascript")

	assert.Equal(t, http.StatusNotFound, performRequest(http.MethodGet, "/notfound", router).Code)

	assert.Equal(t, http.StatusMethodNotAllowed, performRequest(http.MethodPost, "/index.html", router).Code)

	assert.Equal(t, http.StatusMethodNotAllowed, performRequest(http.MethodPut, "/index.html", router).Code)

	// Test: /swagger should redirect to /swagger/index.html (not implemented yet, should fail)
	w := performRequest(http.MethodGet, "/swagger", router)
	assert.Equal(t, http.StatusOK, w.Code)
	assert.Contains(t, w.Body.String(), "<title>Swagger UI</title>")

	// Test: /swagger/ should also return index.html
	wSlash := performRequest(http.MethodGet, "/swagger/", router)
	assert.Equal(t, http.StatusOK, wSlash.Code)
	assert.Contains(t, wSlash.Body.String(), "<title>Swagger UI</title>")
}

func TestDisablingWrapHandler(t *testing.T) {
	gin.SetMode(gin.TestMode)

	router := gin.New()
	disablingKey := "SWAGGER_DISABLE"

	router.GET("/simple/*any", DisablingWrapHandler(swaggerFiles.Handler, disablingKey))

	assert.Equal(t, http.StatusOK, performRequest(http.MethodGet, "/simple/index.html", router).Code)
	assert.Equal(t, http.StatusOK, performRequest(http.MethodGet, "/simple/doc.json", router).Code)

	assert.Equal(t, http.StatusOK, performRequest(http.MethodGet, "/simple/favicon-16x16.png", router).Code)
	assert.Equal(t, http.StatusNotFound, performRequest(http.MethodGet, "/simple/notfound", router).Code)

	_ = os.Setenv(disablingKey, "true")

	router.GET("/disabling/*any", DisablingWrapHandler(swaggerFiles.Handler, disablingKey))

	assert.Equal(t, http.StatusNotFound, performRequest(http.MethodGet, "/disabling/index.html", router).Code)
	assert.Equal(t, http.StatusNotFound, performRequest(http.MethodGet, "/disabling/doc.json", router).Code)
	assert.Equal(t, http.StatusNotFound, performRequest(http.MethodGet, "/disabling/oauth2-redirect.html", router).Code)
	assert.Equal(t, http.StatusNotFound, performRequest(http.MethodGet, "/disabling/notfound", router).Code)
}

func TestDisablingCustomWrapHandler(t *testing.T) {
	gin.SetMode(gin.TestMode)

	router := gin.New()
	disablingKey := "SWAGGER_DISABLE2"

	router.GET("/simple/*any", DisablingCustomWrapHandler(&Config{}, swaggerFiles.Handler, disablingKey))

	assert.Equal(t, http.StatusOK, performRequest(http.MethodGet, "/simple/index.html", router).Code)

	_ = os.Setenv(disablingKey, "true")

	router.GET("/disabling/*any", DisablingCustomWrapHandler(&Config{}, swaggerFiles.Handler, disablingKey))

	assert.Equal(t, http.StatusNotFound, performRequest(http.MethodGet, "/disabling/index.html", router).Code)
}

func TestWithGzipMiddleware(t *testing.T) {
	gin.SetMode(gin.TestMode)
	router := gin.New()

	router.Use(gzip.Gzip(gzip.BestSpeed))

	router.GET("/*any", WrapHandler(swaggerFiles.Handler))

	w1 := performRequest(http.MethodGet, "/index.html", router)
	assert.Equal(t, http.StatusOK, w1.Code)
	assert.Equal(t, w1.Header()["Content-Type"][0], "text/html; charset=utf-8")

	w2 := performRequest(http.MethodGet, "/swagger-ui.css", router)
	assert.Equal(t, http.StatusOK, w2.Code)
	assert.Equal(t, w2.Header()["Content-Type"][0], "text/css; charset=utf-8")

	w3 := performRequest(http.MethodGet, "/swagger-ui-bundle.js", router)
	assert.Equal(t, http.StatusOK, w3.Code)
	assert.Equal(t, w3.Header()["Content-Type"][0], "application/javascript")

	w4 := performRequest(http.MethodGet, "/doc.json", router)
	assert.Equal(t, http.StatusOK, w4.Code)
	assert.Equal(t, w4.Header()["Content-Type"][0], "application/json; charset=utf-8")
}

func performRequest(method, target string, router *gin.Engine) *httptest.ResponseRecorder {
	r := httptest.NewRequest(method, target, nil)
	w := httptest.NewRecorder()
	router.ServeHTTP(w, r)
	return w
}

func TestURL(t *testing.T) {
	cfg := Config{}

	expected := "https://github.com/swaggo/http-swagger"
	configFunc := URL(expected)
	configFunc(&cfg)
	assert.Equal(t, expected, cfg.URL)
}

func TestDocExpansion(t *testing.T) {
	var cfg Config

	expected := "list"
	configFunc := DocExpansion(expected)
	configFunc(&cfg)
	assert.Equal(t, expected, cfg.DocExpansion)

	expected = "full"
	configFunc = DocExpansion(expected)
	configFunc(&cfg)
	assert.Equal(t, expected, cfg.DocExpansion)

	expected = "none"
	configFunc = DocExpansion(expected)
	configFunc(&cfg)
	assert.Equal(t, expected, cfg.DocExpansion)
}

func TestDeepLinking(t *testing.T) {
	var cfg Config
	assert.Equal(t, false, cfg.DeepLinking)

	configFunc := DeepLinking(true)
	configFunc(&cfg)
	assert.Equal(t, true, cfg.DeepLinking)

	configFunc = DeepLinking(false)
	configFunc(&cfg)
	assert.Equal(t, false, cfg.DeepLinking)

}

func TestDefaultModelsExpandDepth(t *testing.T) {
	var cfg Config

	assert.Equal(t, 0, cfg.DefaultModelsExpandDepth)

	expected := -1
	configFunc := DefaultModelsExpandDepth(expected)
	configFunc(&cfg)
	assert.Equal(t, expected, cfg.DefaultModelsExpandDepth)

	expected = 1
	configFunc = DefaultModelsExpandDepth(expected)
	configFunc(&cfg)
	assert.Equal(t, expected, cfg.DefaultModelsExpandDepth)
}

func TestInstanceName(t *testing.T) {
	var cfg Config

	assert.Equal(t, "", cfg.InstanceName)

	expected := swag.Name
	configFunc := InstanceName(expected)
	configFunc(&cfg)
	assert.Equal(t, expected, cfg.InstanceName)

	expected = "custom_name"
	configFunc = InstanceName(expected)
	configFunc(&cfg)
	assert.Equal(t, expected, cfg.InstanceName)
}

func TestPersistAuthorization(t *testing.T) {
	var cfg Config
	assert.Equal(t, false, cfg.PersistAuthorization)

	configFunc := PersistAuthorization(true)
	configFunc(&cfg)
	assert.Equal(t, true, cfg.PersistAuthorization)

	configFunc = PersistAuthorization(false)
	configFunc(&cfg)
	assert.Equal(t, false, cfg.PersistAuthorization)
}

func TestOauth2DefaultClientID(t *testing.T) {
	var cfg Config
	assert.Equal(t, "", cfg.Oauth2DefaultClientID)

	configFunc := Oauth2DefaultClientID("default_client_id")
	configFunc(&cfg)
	assert.Equal(t, "default_client_id", cfg.Oauth2DefaultClientID)

	configFunc = Oauth2DefaultClientID("")
	configFunc(&cfg)
	assert.Equal(t, "", cfg.Oauth2DefaultClientID)
}

func TestOauth2UsePkce(t *testing.T) {
	var cfg Config
	assert.Equal(t, false, cfg.Oauth2UsePkce)

	configFunc := Oauth2UsePkce(true)
	configFunc(&cfg)
	assert.Equal(t, true, cfg.Oauth2UsePkce)

	configFunc = Oauth2UsePkce(false)
	configFunc(&cfg)
	assert.Equal(t, false, cfg.Oauth2UsePkce)
}