package rest

import (
	"bytes"
	"crypto/md5"
	"encoding/json"
	"errors"
	"fmt"
	"github.com/GopeedLab/gopeed/internal/test"
	"github.com/GopeedLab/gopeed/pkg/base"
	"github.com/GopeedLab/gopeed/pkg/download"
	"github.com/GopeedLab/gopeed/pkg/rest/model"
	"io"
	"net"
	"net/http"
	"os"
	"reflect"
	"sync"
	"testing"
	"time"
)

var (
	restPort int

	taskReq = &base.Request{
		Extra: map[string]any{
			"method": "",
			"header": map[string]string{
				"User-Agent": "gopeed",
			},
			"body": "",
		},
	}
	taskRes = &base.Resource{
		Name:  test.BuildName,
		Size:  test.BuildSize,
		Range: true,
		Files: []*base.FileInfo{
			{
				Name: test.BuildName,
				Path: "",
				Size: test.BuildSize,
			},
		},
	}
	createReq = &model.CreateTask{
		Req: taskReq,
		Opts: &base.Options{
			Path: test.Dir,
			Name: test.DownloadName,
			Extra: map[string]any{
				"connections": 2,
			},
		},
	}
)

func TestResolve(t *testing.T) {
	doTest(func() {
		resp := httpRequestCheckOk[*download.ResolveResult](http.MethodPost, "/api/v1/resolve", taskReq)
		if !test.JsonEqual(taskRes, resp.Res) {
			t.Errorf("Resolve() got = %v, want %v", test.ToJson(resp.Res), test.ToJson(taskRes))
		}
	})
}

func TestCreateTask(t *testing.T) {
	doTest(func() {
		var wg sync.WaitGroup
		wg.Add(1)
		Downloader.Listener(func(event *download.Event) {
			if event.Key == download.EventKeyFinally {
				wg.Done()
			}
		})

		taskId := httpRequestCheckOk[string](http.MethodPost, "/api/v1/tasks", createReq)
		if taskId == "" {
			t.Fatal("create task failed")
		}

		wg.Wait()
		want := test.FileMd5(test.BuildFile)
		got := test.FileMd5(test.DownloadFile)
		if want != got {
			t.Errorf("CreateTask() got = %v, want %v", got, want)
		}
	})
}

func TestPauseAndContinueTask(t *testing.T) {
	doTest(func() {
		type result struct {
			pauseCount    int
			continueCount int
			md5           string
		}

		var got = result{
			pauseCount:    0,
			continueCount: 0,
			md5:           "",
		}
		var wg sync.WaitGroup
		wg.Add(1)
		Downloader.Listener(func(event *download.Event) {
			switch event.Key {
			case download.EventKeyPause:
				got.pauseCount++
			case download.EventKeyContinue:
				got.continueCount++
			case download.EventKeyFinally:
				wg.Done()
			}
		})

		taskId := httpRequestCheckOk[string](http.MethodPost, "/api/v1/tasks", createReq)
		t1 := httpRequestCheckOk[*download.Task](http.MethodGet, "/api/v1/tasks/"+taskId, nil)
		if t1.Status != base.DownloadStatusRunning {
			t.Errorf("CreateTask() got = %v, want %v", t1.Status, base.DownloadStatusRunning)
		}
		httpRequestCheckOk[any](http.MethodPut, "/api/v1/tasks/"+taskId+"/pause", nil)
		t2 := httpRequestCheckOk[*download.Task](http.MethodGet, "/api/v1/tasks/"+taskId, nil)
		if t2.Status != base.DownloadStatusPause {
			t.Errorf("PauseTask() got = %v, want %v", t2.Status, base.DownloadStatusPause)
		}
		httpRequestCheckOk[any](http.MethodPut, "/api/v1/tasks/"+taskId+"/continue", nil)
		t3 := httpRequestCheckOk[*download.Task](http.MethodGet, "/api/v1/tasks/"+taskId, nil)
		if t3.Status != base.DownloadStatusRunning {
			t.Errorf("ContinueTask() got = %v, want %v", t3.Status, base.DownloadStatusRunning)
		}

		wg.Wait()
		want := result{
			pauseCount:    1,
			continueCount: 1,
			md5:           test.FileMd5(test.BuildFile),
		}
		got.md5 = test.FileMd5(test.DownloadFile)
		if !reflect.DeepEqual(got, want) {
			t.Errorf("PauseAndContinueTask() got = %v, want %v", got, want)
		}
	})
}

func TestPauseAllAndContinueALLTasks(t *testing.T) {
	doTest(func() {
		cfg, err := Downloader.GetConfig()
		if err != nil {
			t.Fatal(err)
		}

		createAndPause := func() {
			taskId := httpRequestCheckOk[string](http.MethodPost, "/api/v1/tasks", createReq)
			httpRequestCheckOk[*download.Task](http.MethodPut, "/api/v1/tasks/"+taskId+"/pause", nil)
		}

		total := cfg.MaxRunning + 2
		for i := 0; i < total; i++ {
			createAndPause()
		}

		// continue all
		httpRequestCheckOk[any](http.MethodPut, "/api/v1/tasks/continue", nil)
		tasks := httpRequestCheckOk[[]*download.Task](http.MethodGet, fmt.Sprintf("/api/v1/tasks?status=%s", base.DownloadStatusRunning), nil)
		if len(tasks) != cfg.MaxRunning {
			t.Errorf("ContinueAllTasks() got = %v, want %v", len(tasks), cfg.MaxRunning)
		}
		// pause all
		httpRequestCheckOk[any](http.MethodPut, "/api/v1/tasks/pause", nil)
		tasks = httpRequestCheckOk[[]*download.Task](http.MethodGet, fmt.Sprintf("/api/v1/tasks?status=%s,%s", base.DownloadStatusReady, base.DownloadStatusPause), nil)
		if len(tasks) != total {
			t.Errorf("PauseAllTasks() got = %v, want %v", len(tasks), total)
		}

	})
}

func TestDeleteTask(t *testing.T) {
	doTest(func() {
		taskId := httpRequestCheckOk[string](http.MethodPost, "/api/v1/tasks", createReq)
		time.Sleep(time.Millisecond * 200)
		httpRequestCheckOk[any](http.MethodDelete, "/api/v1/tasks/"+taskId, nil)
		code, _ := httpRequest[*download.Task](http.MethodGet, "/api/v1/tasks/"+taskId, nil)
		checkCode(code, model.CodeTaskNotFound)
	})
}

func TestDeleteTaskForce(t *testing.T) {
	doTest(func() {
		taskId := httpRequestCheckOk[string](http.MethodPost, "/api/v1/tasks", createReq)
		time.Sleep(time.Millisecond * 200)
		httpRequestCheckOk[any](http.MethodDelete, "/api/v1/tasks/"+taskId+"?force=true", nil)
		code, _ := httpRequest[*download.Task](http.MethodGet, "/api/v1/tasks/"+taskId, nil)
		checkCode(code, model.CodeTaskNotFound)
		if _, err := os.Stat(test.DownloadFile); !errors.Is(err, os.ErrNotExist) {
			t.Errorf("DeleteTaskForce() got = %v, want %v", err, os.ErrNotExist)
		}
	})
}

func TestGetTasks(t *testing.T) {
	doTest(func() {
		var wg sync.WaitGroup
		wg.Add(1)
		Downloader.Listener(func(event *download.Event) {
			if event.Key == download.EventKeyFinally {
				wg.Done()
			}
		})

		httpRequestCheckOk[string](http.MethodPost, fmt.Sprintf("/api/v1/tasks?status=%s,%s",
			base.DownloadStatusReady, base.DownloadStatusRunning), createReq)
		httpRequestCheckOk[[]*download.Task](http.MethodGet, "/api/v1/tasks", nil)

		wg.Wait()
		r := httpRequestCheckOk[[]*download.Task](http.MethodGet, fmt.Sprintf("/api/v1/tasks?status=%s",
			base.DownloadStatusDone), nil)
		if r[0].Status != base.DownloadStatusDone {
			t.Errorf("GetTasks() got = %v, want %v", r[0].Status, base.DownloadStatusDone)
		}
		r = httpRequestCheckOk[[]*download.Task](http.MethodGet, fmt.Sprintf("/api/v1/tasks?status=%s,%s",
			base.DownloadStatusReady, base.DownloadStatusRunning), nil)
		if len(r) > 0 {
			t.Errorf("GetTasks() got = %v, want %v", len(r), 0)
		}
	})
}

func TestGetAndPutConfig(t *testing.T) {
	doTest(func() {
		cfg := httpRequestCheckOk[*download.DownloaderStoreConfig](http.MethodGet, "/api/v1/config", nil)
		cfg.DownloadDir = "./download"
		cfg.Extra = map[string]any{
			"serverConfig": &Config{
				Host: "127.0.0.1",
				Port: 8080,
			},
			"theme": "dark",
		}
		httpRequestCheckOk[any](http.MethodPut, "/api/v1/config", cfg)

		newCfg := httpRequestCheckOk[*download.DownloaderStoreConfig](http.MethodGet, "/api/v1/config", nil)
		if !test.JsonEqual(cfg, newCfg) {
			t.Errorf("GetAndPutConfig() got = %v, want %v", test.ToJson(newCfg), test.ToJson(cfg))
		}
	})
}

func TestDoProxy(t *testing.T) {
	doTest(func() {
		code, respBody := doHttpRequest0(http.MethodGet, "/api/v1/proxy", map[string]string{
			"X-Target-Uri": "https://github.com/GopeedLab/gopeed/raw/695da7ea87d2b455552b709d3cb4d7879484d4d1/README.md",
		}, nil)
		if code != http.StatusOK {
			t.Errorf("DoProxy() got = %v, want %v", code, http.StatusOK)
		}
		want := "4ee193b676f1ebb2ad810e016350d52a"
		got := fmt.Sprintf("%x", md5.Sum(respBody))
		if got != want {
			t.Errorf("DoProxy() got = %v, want %v", got, want)
		}
	})

	doTest(func() {
		code, _ := doHttpRequest0(http.MethodGet, "/api/v1/proxy", map[string]string{
			"X-Target-Uri": "https://github.com/GopeedLab/gopeed/raw/695da7ea87d2b455552b709d3cb4d7879484d4d1/NOT_FOUND",
		}, nil)
		if code != http.StatusNotFound {
			t.Errorf("DoProxy() got = %v, want %v", code, http.StatusNotFound)
		}
	})
}

func TestApiToken(t *testing.T) {
	var cfg = &model.StartConfig{}
	cfg.Init()
	cfg.ApiToken = "123456"
	fileListener := doStart(cfg)
	defer func() {
		if err := fileListener.Close(); err != nil {
			panic(err)
		}
		Stop()
	}()

	status, _ := doHttpRequest0(http.MethodGet, "/api/v1/config", nil, nil)
	if status != http.StatusUnauthorized {
		t.Errorf("TestApiToken() got = %v, want %v", status, http.StatusUnauthorized)
	}

	status, _ = doHttpRequest0(http.MethodGet, "/api/v1/config", map[string]string{
		"X-Api-Token": cfg.ApiToken,
	}, nil)
	if status != http.StatusOK {
		t.Errorf("TestApiToken() got = %v, want %v", status, http.StatusOK)
	}

}

func TestAuthorization(t *testing.T) {
	var cfg = &model.StartConfig{}
	cfg.Init()
	cfg.ApiToken = "123456"
	cfg.WebEnable = true
	cfg.WebBasicAuth = &model.WebBasicAuth{
		Username: "admin",
		Password: "123456",
	}
	fileListener := doStart(cfg)
	defer func() {
		if err := fileListener.Close(); err != nil {
			panic(err)
		}
		Stop()
	}()

	status, _ := doHttpRequest0(http.MethodGet, "/api/v1/config", nil, nil)
	if status != http.StatusUnauthorized {
		t.Errorf("TestAuthorization() got = %v, want %v", status, http.StatusUnauthorized)
	}

	status, _ = doHttpRequest0(http.MethodGet, "/api/v1/config", map[string]string{
		"Authorization": cfg.WebBasicAuth.Authorization(),
	}, nil)
	if status != http.StatusOK {
		t.Errorf("TestAuthorization() got = %v, want %v", status, http.StatusOK)
	}

	status, _ = doHttpRequest0(http.MethodGet, "/api/v1/config", map[string]string{
		"X-Api-Token": cfg.ApiToken,
	}, nil)
	if status != http.StatusOK {
		t.Errorf("TestAuthorization() got = %v, want %v", status, http.StatusOK)
	}
}

func doTest(handler func()) {
	testFunc := func(storage model.Storage) {
		var cfg = &model.StartConfig{}
		cfg.Init()
		cfg.Storage = storage
		fileListener := doStart(cfg)
		defer func() {
			if err := fileListener.Close(); err != nil {
				panic(err)
			}
			Stop()
		}()
		defer Downloader.Clear()
		defer func() {
			tasks := Downloader.GetTasks()
			taskIds := make([]string, len(tasks))
			for i, task := range tasks {
				taskIds[i] = task.ID
			}
			for _, id := range taskIds {
				Downloader.Delete(id, true)
			}
		}()
		taskReq.URL = "http://" + fileListener.Addr().String() + "/" + test.BuildName
		handler()
	}
	testFunc(model.StorageMem)
	testFunc(model.StorageBolt)
}

func doStart(cfg *model.StartConfig) net.Listener {
	port, err := Start(cfg)
	if err != nil {
		panic(err)
	}
	restPort = port
	return test.StartTestFileServer()
}

func doHttpRequest0(method string, path string, headers map[string]string, body any) (int, []byte) {
	var reader io.Reader
	if body != nil {
		buf, _ := json.Marshal(body)
		reader = bytes.NewBuffer(buf)
	}

	request, err := http.NewRequest(method, fmt.Sprintf("http://127.0.0.1:%d%s", restPort, path), reader)
	if err != nil {
		panic(err)
	}
	if headers != nil {
		for k, v := range headers {
			request.Header.Set(k, v)
		}
	}
	response, err := http.DefaultClient.Do(request)
	if err != nil {
		panic(err)
	}
	defer response.Body.Close()
	respBody, err := io.ReadAll(response.Body)
	if err != nil {
		panic(err)
	}

	return response.StatusCode, respBody
}

func doHttpRequest[T any](method string, path string, headers map[string]string, body any) (int, *model.Result[T]) {
	statusCode, respBody := doHttpRequest0(method, path, headers, body)
	if statusCode != http.StatusOK {
		panic(fmt.Sprintf("http request failed, status code: %d", statusCode))
	}

	var r model.Result[T]
	if err := json.Unmarshal(respBody, &r); err != nil {
		panic(err)
	}
	return int(r.Code), &r
}

func httpRequest[T any](method string, path string, body any) (int, *model.Result[T]) {
	return doHttpRequest[T](method, path, nil, body)
}

func httpRequestCheckOk[T any](method string, path string, body any) T {
	code, result := httpRequest[T](method, path, body)
	checkOk(code)
	return result.Data
}

func checkOk(code int) {
	checkCode(code, model.CodeOk)
}

func checkCode(code int, exceptCode model.RespCode) {
	if code != int(exceptCode) {
		panic(fmt.Sprintf("code got = %d, want %d", code, exceptCode))
	}
}