package lazyhandler

import (
	"fmt"
	"io"
	"log"
	"net/http"
	"net/http/httptest"
	"strconv"
	"strings"
	"testing"

	"git.jeffthecoder.xyz/public/lazyhandler/magic"
	"github.com/gorilla/websocket"
)

type StatusPathValues struct {
	Status int `pathvalue:"status"`
}

type HelloWorldRequest struct {
	Name string `json:"name"`
}
type HelloWorldResponse struct {
	Greeting string `json:"greeting"`
}

type HelloWorldParams struct {
	Name *string `pathvalue:"name,match=" query:"name"`
}

type MultipleParams struct {
	Numbers        []int
	Strings        []string
	OptionalNumber *int
	OptionalString *string
}

func TestNotAFunc(t *testing.T) {
	v, err := MagicHandler(1)
	if err == nil {
		t.Fatalf("expect not ok, get %v", v)
	}
}

func TestEmptyFunc(t *testing.T) {
	MagicHandler(func() {

	})
}

type SomeType int

func (obj SomeType) Func() {

}

func TestMethod(t *testing.T) {
	obj := SomeType(0)
	MagicHandler(obj.Func)
}

type testCase struct {
	Path    string
	Pattern string

	CreateHandler              func() http.Handler
	ExpectPanicOnCreateHandler bool

	NoCheck       bool
	MakeRequest   func(string) *http.Request
	CheckResponse func(*http.Response) error
}

var (
	cases = []testCase{
		{
			Path:    "/",
			Pattern: "/{$}",

			CreateHandler: func() http.Handler {
				return MustMagicHandler(func() (int, string, error) {
					return 200, "hi", nil
				})
			},
			MakeRequest: func(base string) *http.Request {
				r, err := http.NewRequest("GET", base+"/", nil)
				if err != nil {
					panic(err)
				}
				return r
			},
		},
		{
			Pattern: "/error-checked-before-other-return-values",

			CreateHandler: func() http.Handler {
				return MustMagicHandler(func() (int, string, error) {
					// it checks errors first
					return 200, "hi", fmt.Errorf("it is handled before other return values")
				})
			},
			MakeRequest: func(base string) *http.Request {
				r, err := http.NewRequest("GET", base+"/return-error", nil)
				if err != nil {
					panic(err)
				}
				return r
			},
		},
		{
			Pattern: "/return-nil",
			CreateHandler: func() http.Handler {
				return MustMagicHandler(func() (magic.RespondWriter, error) {
					// no response body, 200
					return nil, nil
				})
			},
		},
		{
			Pattern: "/no-return",
			CreateHandler: func() http.Handler {
				return MustMagicHandler(func() {
					// return nothing at all
				})
			},
		},
		{
			Pattern: "/no-error",
			CreateHandler: func() http.Handler {
				return MustMagicHandler(func() int {
					// well, error is not needed
					return http.StatusNoContent
				})
			},
		},
		{
			Pattern: "/respond-json",
			CreateHandler: func() http.Handler {
				return MustMagicHandler(func() magic.Json[map[string]any] {
					return magic.Json[map[string]any]{
						Data: map[string]any{
							"message": "hello, world",
						},
					}
				})
			},
		},
		{
			Pattern: "/extract-json",
			CreateHandler: func() http.Handler {
				return MustMagicHandler(func(body magic.Json[HelloWorldRequest]) magic.Json[HelloWorldResponse] {
					return magic.Json[HelloWorldResponse]{
						Data: HelloWorldResponse{
							Greeting: "hello, " + body.Data.Name,
						},
					}
				})
			},
		},
		{
			Pattern: "/extract-optional",
			CreateHandler: func() http.Handler {
				// the parameter accepts a pointer to extractor, which indicates that it is optional
				return MustMagicHandler(func(body *magic.Json[HelloWorldRequest]) magic.Json[HelloWorldResponse] {
					name := "world"
					if body != nil {
						name = body.Data.Name
					}
					return magic.Json[HelloWorldResponse]{
						Data: HelloWorldResponse{
							Greeting: "hello, " + name,
						},
					}
				})
			},
		},
		{
			Path:    "/inject-request-respond-status-from-http-request/418", // yeah...i'm a teapot, lol
			Pattern: "/inject-request-respond-status-from-http-request/{status}",
			CreateHandler: func() http.Handler {
				return MustMagicHandler(func(r *http.Request) (int, error) {
					// inject *http.Request, respond with status only
					return strconv.Atoi(r.PathValue("status"))
				})
			},
		},
		{
			Path:    "/inject-path-value-respond-status/418", // yeah...i'm a teapot, lol
			Pattern: "/inject-path-value-respond-status/{status}",
			CreateHandler: func() http.Handler {
				return MustMagicHandler(func(pathValues magic.PathValue[StatusPathValues]) int {
					return pathValues.Data.Status
				})
			},
		},
		{
			Path:    "/inject-optional-path-value/rose", // name extracted
			Pattern: "/inject-optional-path-value/{name}",
			CreateHandler: func() http.Handler {
				return MustMagicHandler(func(pathValues magic.PathValue[HelloWorldParams]) magic.Json[HelloWorldResponse] {
					name := "world"
					if pathValues.Data.Name != nil {
						name = *pathValues.Data.Name
					}
					return magic.Json[HelloWorldResponse]{
						Data: HelloWorldResponse{
							Greeting: "hello, " + name,
						},
					}
				})
			},
		},
		{
			Path:    "/inject-optional-path-value", // name fallback to world
			Pattern: "/inject-optional-path-value",
			CreateHandler: func() http.Handler {
				return MustMagicHandler(func(pathValues magic.PathValue[HelloWorldParams]) magic.Json[HelloWorldResponse] {
					name := "world"
					if pathValues.Data.Name != nil {
						name = *pathValues.Data.Name
					}
					return magic.Json[HelloWorldResponse]{
						Data: HelloWorldResponse{
							Greeting: "hello, " + name,
						},
					}
				})
			},
		},
		{
			Pattern: "/direct-response-writer-extractor",
			CreateHandler: func() http.Handler {
				return MustMagicHandler(func(w http.ResponseWriter) {
					w.WriteHeader(http.StatusNoContent)
				})
			},
		},
		{
			Pattern: "/hahaha-it-act-just-like-http-handlerfunc",
			CreateHandler: func() http.Handler {
				return MustMagicHandler(func(w http.ResponseWriter, r *http.Request) {
					w.WriteHeader(http.StatusNoContent)
				})
			},
		},
		{
			Pattern: "/websocket",
			CreateHandler: func() http.Handler {
				return MustMagicHandler(func(ws *websocket.Conn) {

				})
			},
			NoCheck: true,
		},
		{
			Pattern: "/multiple-respond-extractor-should-panic-on-create",
			CreateHandler: func() http.Handler {
				return MustMagicHandler(func(conn *websocket.Conn) magic.Json[HelloWorldResponse] {
					return magic.Json[HelloWorldResponse]{}
				})
			},
			ExpectPanicOnCreateHandler: true,
		},
		// {
		// 	Pattern: "/hello-query",
		// 	CreateHandler: func() http.Handler {
		// 		return MustMagicHandler(func(query magic.Query[HelloWorldParams]) magic.Json[HelloWorldResponse] {
		// 			name := "world"
		// 			if query.Data.Name != nil {
		// 				name = *query.Data.Name
		// 			}
		// 			return magic.Json[HelloWorldResponse]{
		// 				Data: HelloWorldResponse{
		// 					Greeting: "hello, " + name,
		// 				},
		// 			}
		// 		})
		// 	},
		// },
		{
			Pattern: "/test-query",
			CreateHandler: func() http.Handler {
				return MustMagicHandler(func(query magic.Query[MultipleParams]) {
					log.Println(query.Data)
				})
			},
		},
	}
)

func TestActualFunctions(t *testing.T) {
	mux := http.NewServeMux()

	t.Run("register-routes", func(t *testing.T) {
		for _, c := range cases {
			path := c.Path
			if path == "" {
				path = c.Pattern
			}
			t.Run(strings.TrimPrefix(path, "/"), func(t *testing.T) {
				defer func() {
					if o := recover(); (o != nil) != c.ExpectPanicOnCreateHandler {
						if c.ExpectPanicOnCreateHandler {
							t.Fatal("expect panic but panic did not occur")
						} else {
							t.Fatalf("panic not expected: %v", o)
						}
					}
				}()
				if handler := c.CreateHandler(); handler != nil {
					mux.Handle(c.Pattern, handler)
				}
			})
		}
	})

	t.Run("check-actual-result", func(t *testing.T) {
		server := httptest.NewTLSServer(mux)
		client := server.Client()
		for _, c := range cases {
			if c.ExpectPanicOnCreateHandler || c.NoCheck {
				continue
			}

			path := c.Path
			if path == "" {
				path = c.Pattern
			}
			t.Run(strings.TrimPrefix(path, "/"), func(t *testing.T) {
				var req *http.Request

				if c.MakeRequest != nil {
					req = c.MakeRequest(server.URL)
				} else {
					request, err := http.NewRequest("GET", server.URL+path, nil)
					if err != nil {
						t.Fatal(err)
					}
					req = request
				}
				resp, err := client.Do(req)
				if err != nil {
					t.Fatal(err)
				}
				resp.Body.Close()
				log.Println(resp)
				if bytes, err := io.ReadAll(resp.Body); err == nil {
					log.Println(string(bytes))
				}
			})

		}

	})
}