/*
 * TencentBlueKing is pleased to support the open source community by making
 * 蓝鲸智云 - 配置平台 (BlueKing - CMDB) available.
 * Copyright (C) 2025 Tencent. All rights reserved.
 * Licensed under the MIT License (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at http://opensource.org/licenses/MIT
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on
 * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied. See the License for the
 * specific language governing permissions and limitations under the License.
 * We undertake not to change the open source license (MIT license) applicable
 * to the current version of the project delivered to anyone in the future.
 */

package rest

import (
	"bytes"
	"context"
	"encoding/json/v2"
	"fmt"
	"io"
	"net/http"
	"net/http/httptest"
	"net/http/httptrace"
	"strconv"
	"strings"
	"sync"
	"sync/atomic"
	"testing"
	"time"

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

	"git.ifooth.com/common/pkg/rest/transport"
)

func testServer() *httptest.Server {
	r := http.NewServeMux()
	// 正常数据返回
	r.HandleFunc("GET /uuid", func(w http.ResponseWriter, r *http.Request) {
		data := fmt.Sprintf(`{"uuid": "%s"}`, uuid.NewString())

		// 原样返回query
		for k, v := range r.URL.Query() {
			w.Header().Set("query-"+k, strings.Join(v, ","))
		}

		w.Header().Set("content-type", "application/json")
		w.Write([]byte(data))
	})

	// 状态码测试
	r.HandleFunc("/status/{code}", func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("content-type", "text/html; charset=utf-8")

		code, err := strconv.ParseInt(r.PathValue("code"), 10, 64)
		if err != nil {
			http.Error(w, err.Error(), http.StatusBadRequest)
			return
		}

		w.WriteHeader(int(code))
		w.Write([]byte(r.PathValue("code")))

	})

	r.HandleFunc("/bkResult/ok", func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("content-type", "application/json")

		w.WriteHeader(int(400))
		w.Write([]byte(`{"code": 0, "data": {"name": "ko"}}`))
	})

	r.HandleFunc("/bkResult/failed", func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("content-type", "application/json")

		w.WriteHeader(int(400))
		w.Write([]byte(`{"code": 100400, "data": null}`))

	})

	// 原样返回任何body数据
	r.HandleFunc("/echo", func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("content-type", "text/html; charset=utf-8")
		body, err := io.ReadAll(r.Body)
		if err != nil {
			http.Error(w, err.Error(), http.StatusBadRequest)
			return
		}

		// 原样返回query
		for k, v := range r.URL.Query() {
			w.Header().Set("query-"+k, strings.Join(v, ","))
		}

		w.Write(body)
	})

	ts := httptest.NewServer(r)
	return ts
}

type testResp struct {
	UUID string `json:"uuid"`
}

type BkResp[T any] struct {
	Code int `json:"code"`
	Data *T  `json:"data"`
}

type bkResult struct {
	Name string `json:"name"`
}

type BkError struct {
	Code int `json:"code"`
}

func CustomC() *Client {
	c := NewClient().
		SetHeader("abc", "abc").
		SetQueryParam("name", "ko").
		With(transport.CurlLog())

	return c
}

func TestClientUseAsDo(t *testing.T) {
	svr := testServer()
	defer svr.Close()

	req, err := http.NewRequest("POST", svr.URL+"/echo", bytes.NewBuffer([]byte("testdata")))
	assert.NoError(t, err)

	// 用法1: Client使用Do处理请求
	client := NewClient().With(transport.CurlLog()).SetQueryParam("ko", "set")

	resp, err := client.Do(req)
	assert.NoError(t, err)

	body, err := io.ReadAll(resp.Body)
	assert.NoError(t, err)

	assert.Equal(t, []byte("testdata"), body)
	assert.Equal(t, resp.Header.Get("query-ko"), "set")
}

func TestClientUseAsTransport(t *testing.T) {
	svr := testServer()
	defer svr.Close()

	req, err := http.NewRequest("POST", svr.URL+"/echo", bytes.NewBuffer([]byte("testdata")))
	assert.NoError(t, err)

	// 用法2: Client作为第三方http库的transport处理请求
	client := &http.Client{}
	client.Transport = NewClient().With(transport.CurlLog()).SetQueryParam("ko", "set").GetTransport()

	resp, err := client.Do(req)
	assert.NoError(t, err)

	body, err := io.ReadAll(resp.Body)
	assert.NoError(t, err)

	assert.Equal(t, []byte("testdata"), body)
	assert.Equal(t, resp.Header.Get("query-ko"), "set")
}

func TestRequestUseHTTPClient(t *testing.T) {
	svr := testServer()
	defer svr.Close()

	resp, err := http.Get(svr.URL + "/uuid")
	assert.NoError(t, err)
	defer resp.Body.Close()

	body, err := io.ReadAll(resp.Body)
	assert.NoError(t, err)

	r := new(testResp)
	err = json.Unmarshal(body, r)
	assert.NoError(t, err)

	assert.Equal(t, len(r.UUID), 36)

	// 用法3: Request[T]使用原生HTTP Client
	r1, err := R[string]().SetClient(http.DefaultClient).SetBody("testdata").Post(svr.URL + "/echo")
	assert.NoError(t, err)

	assert.Equal(t, "testdata", *r1)

	r2, err := R[http.Response]().SetClient(http.DefaultClient).With(transport.CurlLog()).SetQueryParam("ko", "hi").SetBody("testdata").Post(svr.URL + "/echo")
	assert.NoError(t, err)
	body, err = io.ReadAll(r2.Body)
	assert.NoError(t, err)

	assert.Equal(t, "testdata", string(body))
	assert.Equal(t, "hi", r2.Header.Get("query-ko"))
}

func TestRequestUseRestClient(t *testing.T) {
	svr := testServer()
	defer svr.Close()

	// 用法4: Request[T]使用rest.Client
	r, err := R[testResp]().Get(svr.URL + "/uuid")
	assert.NoError(t, err)
	assert.Equal(t, len(r.UUID), 36)

	rb, err := R[[]byte]().Get(svr.URL + "/uuid")
	require.NoError(t, err)
	assert.Equal(t, len(*rb), 48)

	r3, err := R[io.Reader]().Get(svr.URL + "/uuid")
	assert.NoError(t, err)

	r31, err := io.ReadAll(*r3)
	assert.NoError(t, err)
	assert.Equal(t, len(r31), 48)

	r4, err := R[io.ReadCloser]().Get(svr.URL + "/uuid")
	assert.NoError(t, err)
	r41, err := io.ReadAll(*r4)
	assert.NoError(t, err)
	(*r4).Close()
	assert.Equal(t, len(r41), 48)

	r5, err := R[http.Response]().SetClient(CustomC()).
		SetContext(t.Context()).
		SetHeader("ko", "abc").
		SetQueryParam("age", "12").
		Get(svr.URL + "/uuid?dd=abc")
	assert.NoError(t, err)
	r51, err := io.ReadAll(r5.Body)
	assert.NoError(t, err)
	r5.Body.Close()
	assert.Equal(t, len(r51), 48)
	assert.Equal(t, "12", r5.Header.Get("query-age"))
}

func TestClientReuseConn(t *testing.T) {
	svr := testServer()
	defer svr.Close()

	t.Logf("svrAddr: %s", svr.URL)

	ctx, cancel := context.WithTimeout(t.Context(), time.Second*2)
	defer cancel()

	var (
		wg       sync.WaitGroup
		reqCount atomic.Int64
		newConn  atomic.Int64
	)

	ctx = httptrace.WithClientTrace(
		ctx,
		&httptrace.ClientTrace{ConnectStart: func(_ string, _ string) {
			newConn.Add(1)
		}},
	)

	concurrent := int64(10)
	for range concurrent {
		wg.Go(func() {
			for {
				reqCount.Add(1)

				r, err := R[string]().SetContext(ctx).Get(svr.URL + "/uuid")
				if err != nil {
					assert.ErrorIs(t, err, context.DeadlineExceeded)
					return
				}

				assert.True(t, len(*r) > 10)
				time.Sleep(time.Millisecond * 10)
			}
		})
	}

	wg.Wait()

	t.Logf("newConn: %d, reqCount: %d", newConn.Load(), reqCount.Load())
	assert.Less(t, newConn.Load(), concurrent*2)
}

func BenchmarkClientReuseConn(b *testing.B) {
	svr := testServer()
	defer svr.Close()

	b.Logf("addr: %s", svr.URL)

	var (
		reqCount atomic.Int64
		newConn  atomic.Int64
	)

	ctx := httptrace.WithClientTrace(
		b.Context(),
		&httptrace.ClientTrace{ConnectStart: func(_ string, _ string) {
			newConn.Add(1)
		}},
	)

	b.RunParallel(func(pb *testing.PB) {
		for pb.Next() {
			reqCount.Add(1)

			r, err := R[string]().SetContext(ctx).Get(svr.URL + "/uuid")
			if err != nil {
				assert.ErrorIs(b, err, context.Canceled)
				return
			}

			assert.NoError(b, err)
			assert.True(b, len(*r) > 10)
			time.Sleep(time.Millisecond * 10)
		}
	})

	b.Logf("newConn: %d, reqCount: %d", newConn.Load(), reqCount.Load())
	assert.Less(b, newConn.Load(), int64(20))
}

func TestClientBody(t *testing.T) {
	svr := testServer()
	defer svr.Close()

	r, err := R[string]().SetBody("test").Get(svr.URL + "/echo")
	require.NoError(t, err)
	assert.Equal(t, *r, "test")

	r, err = R[string]().SetBody([]byte("test")).Get(svr.URL + "/echo")
	require.NoError(t, err)
	assert.Equal(t, *r, "test")

	r, err = R[string]().SetBody(strings.NewReader("test")).Get(svr.URL + "/echo")
	require.NoError(t, err)
	assert.Equal(t, *r, "test")

	r, err = R[string]().SetBody(map[string]string{"name": "test"}).Get(svr.URL + "/echo")
	require.NoError(t, err)
	assert.Equal(t, *r, `{"name":"test"}`)

	r, err = R[string]().SetBody([]int{1, 2, 3}).Get(svr.URL + "/echo")
	require.NoError(t, err)
	assert.Equal(t, *r, `[1,2,3]`)

	r, err = R[string]().SetBody(testResp{UUID: "test"}).Get(svr.URL + "/echo")
	require.NoError(t, err)
	assert.Equal(t, *r, `{"uuid":"test"}`)

	r, err = R[string]().SetBody(&testResp{UUID: "test"}).Get(svr.URL + "/echo")
	require.NoError(t, err)
	assert.Equal(t, *r, `{"uuid":"test"}`)

	r, err = R[string]().SetBody(nil).Get(svr.URL + "/echo")
	require.NoError(t, err)
	assert.Equal(t, *r, "")

	r, err = R[string]().SetBody(fmt.Errorf("test")).Get(svr.URL + "/echo")
	assert.Error(t, err)
	assert.Nil(t, r)

	r, err = R[string]().SetBody(123).Get(svr.URL + "/echo")
	assert.ErrorIs(t, err, ErrUnsupported)
	assert.Nil(t, r)
}

func TestClientURL(t *testing.T) {
	svr := testServer()
	defer svr.Close()

	r, err := R[string]().SetClient(NewClient().SetBaseURL("")).
		SetBody("test").Get("/echo")
	assert.Error(t, err)
	assert.Equal(t, "baseURL is required", err.Error())
	assert.Nil(t, r)

	r, err = R[string]().SetClient(NewClient().SetBaseURL(svr.URL)).
		SetBody("test").Get("/echo")
	require.NoError(t, err)
	assert.Equal(t, *r, "test")

	// send as json
	r, err = R[string]().SetClient(NewClient().SetBaseURL(svr.URL).With(transport.CurlLog())).
		SetBody(map[string]string{"name": "ko"}).Get("/echo")
	require.NoError(t, err)
	assert.Equal(t, *r, "{\"name\":\"ko\"}")

	r, err = R[string]().SetClient(NewClient().SetBaseURL(svr.URL + "/abc")).
		SetBody("test").Get(svr.URL + "/echo")
	assert.Error(t, err)
	assert.Nil(t, r)

	r2, err := R[http.Response]().SetClient(NewClient().SetBaseURL(svr.URL + "/abc?name=ko").With(transport.CurlLog())).
		SetBody("test").Get("/echo?abc=ddd")
	require.NoError(t, err)
	assert.Equal(t, r2.StatusCode, http.StatusNotFound)
}