package sentrygin_test

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

	"github.com/getsentry/sentry-go"
	sentrygin "github.com/getsentry/sentry-go/gin"
	"github.com/getsentry/sentry-go/internal/testutils"
	"github.com/gin-gonic/gin"
	"github.com/google/go-cmp/cmp"
	"github.com/google/go-cmp/cmp/cmpopts"
)

func TestIntegration(t *testing.T) {
	largePayload := strings.Repeat("Large", 3*1024) // 15 KB

	tests := []struct {
		RequestPath string
		RoutePath   string
		Method      string
		WantStatus  int
		Body        string
		Handler     gin.HandlerFunc

		WantEvent       *sentry.Event
		WantTransaction *sentry.Event
	}{
		{
			RequestPath: "/panic/1",
			RoutePath:   "/panic/:id",
			Method:      "GET",
			WantStatus:  200,
			Handler: func(c *gin.Context) {
				panic("test")
			},
			WantTransaction: &sentry.Event{
				Level:       sentry.LevelInfo,
				Type:        "transaction",
				Transaction: "GET /panic/:id",
				Request: &sentry.Request{
					URL:    "/panic/1",
					Method: "GET",
					Headers: map[string]string{
						"Accept-Encoding": "gzip",
						"User-Agent":      "Go-http-client/1.1",
					},
				},
				TransactionInfo: &sentry.TransactionInfo{Source: "route"},
				Contexts: map[string]sentry.Context{
					"trace": sentry.TraceContext{
						Data: map[string]interface{}{
							"http.request.method":       http.MethodGet,
							"http.response.status_code": http.StatusOK,
						},
						Op:     "http.server",
						Status: sentry.SpanStatusOK,
					}.Map(),
				}},
			WantEvent: &sentry.Event{
				Level:   sentry.LevelFatal,
				Message: "test",
				Request: &sentry.Request{
					URL:    "/panic/1",
					Method: "GET",
					Headers: map[string]string{
						"Accept-Encoding": "gzip",
						"User-Agent":      "Go-http-client/1.1",
					},
				},
			},
		},
		{
			RequestPath: "/404/1",
			RoutePath:   "",
			Method:      "GET",
			WantStatus:  404,
			Handler:     nil,
			WantTransaction: &sentry.Event{
				Level:       sentry.LevelInfo,
				Type:        "transaction",
				Transaction: "GET /404/1",
				Request: &sentry.Request{
					URL:    "/404/1",
					Method: "GET",
					Headers: map[string]string{
						"Accept-Encoding": "gzip",
						"User-Agent":      "Go-http-client/1.1",
					},
				},
				TransactionInfo: &sentry.TransactionInfo{Source: "url"},
				Contexts: map[string]sentry.Context{
					"trace": sentry.TraceContext{
						Data: map[string]interface{}{
							"http.request.method":       http.MethodGet,
							"http.response.status_code": http.StatusNotFound,
						},
						Op:     "http.server",
						Status: sentry.SpanStatusNotFound,
					}.Map(),
				},
			},
			WantEvent: nil,
		},
		{
			RequestPath: "/post",
			RoutePath:   "/post",
			Method:      "POST",
			WantStatus:  200,
			Body:        "payload",
			Handler: func(c *gin.Context) {
				hub := sentry.GetHubFromContext(c.Request.Context())
				body, err := io.ReadAll(c.Request.Body)
				if err != nil {
					t.Error(err)
				}
				hub.CaptureMessage("post: " + string(body))
				c.JSON(http.StatusOK, gin.H{"status": "ok"})
			},
			WantTransaction: &sentry.Event{
				Level:       sentry.LevelInfo,
				Type:        "transaction",
				Transaction: "POST /post",
				Request: &sentry.Request{
					URL:    "/post",
					Method: "POST",
					Data:   "payload",
					Headers: map[string]string{
						"Content-Length":  "7",
						"Accept-Encoding": "gzip",
						"User-Agent":      "Go-http-client/1.1",
					},
				},
				TransactionInfo: &sentry.TransactionInfo{Source: "route"},
				Contexts: map[string]sentry.Context{
					"trace": sentry.TraceContext{
						Data: map[string]interface{}{
							"http.request.method":       http.MethodPost,
							"http.response.status_code": http.StatusOK,
						},
						Op:     "http.server",
						Status: sentry.SpanStatusOK,
					}.Map(),
				}},
			WantEvent: &sentry.Event{
				Level:   sentry.LevelInfo,
				Message: "post: payload",
				Request: &sentry.Request{
					URL:    "/post",
					Method: "POST",
					Data:   "payload",
					Headers: map[string]string{
						"Accept-Encoding": "gzip",
						"Content-Length":  "7",
						"User-Agent":      "Go-http-client/1.1",
					},
				},
			},
		},
		{
			RequestPath: "/get",
			RoutePath:   "/get",
			Method:      "GET",
			WantStatus:  200,
			Handler: func(c *gin.Context) {
				hub := sentry.GetHubFromContext(c.Request.Context())
				hub.CaptureMessage("get")
				c.JSON(http.StatusOK, gin.H{"status": "get"})
			},
			WantTransaction: &sentry.Event{
				Level:       sentry.LevelInfo,
				Type:        "transaction",
				Transaction: "GET /get",
				Request: &sentry.Request{
					URL:    "/get",
					Method: "GET",
					Headers: map[string]string{
						"Accept-Encoding": "gzip",
						"User-Agent":      "Go-http-client/1.1",
					},
				},
				TransactionInfo: &sentry.TransactionInfo{Source: "route"},
				Contexts: map[string]sentry.Context{
					"trace": sentry.TraceContext{
						Data: map[string]interface{}{
							"http.request.method":       http.MethodGet,
							"http.response.status_code": http.StatusOK,
						},
						Op:     "http.server",
						Status: sentry.SpanStatusOK,
					}.Map(),
				}},
			WantEvent: &sentry.Event{
				Level:   sentry.LevelInfo,
				Message: "get",
				Request: &sentry.Request{
					URL:    "/get",
					Method: "GET",
					Headers: map[string]string{
						"Accept-Encoding": "gzip",
						"User-Agent":      "Go-http-client/1.1",
					},
				},
			},
		},
		{
			RequestPath: "/post/large",
			RoutePath:   "/post/large",
			Method:      "POST",
			WantStatus:  200,
			Body:        largePayload,
			Handler: func(c *gin.Context) {
				hub := sentry.GetHubFromContext(c.Request.Context())
				body, err := io.ReadAll(c.Request.Body)
				if err != nil {
					t.Error(err)
				}
				hub.CaptureMessage(fmt.Sprintf("post: %d KB", len(body)/1024))
			},
			WantTransaction: &sentry.Event{
				Level:       sentry.LevelInfo,
				Type:        "transaction",
				Transaction: "POST /post/large",
				Request: &sentry.Request{
					URL:    "/post/large",
					Method: "POST",
					Headers: map[string]string{
						"Accept-Encoding": "gzip",
						"Content-Length":  strconv.Itoa(len(largePayload)),
						"User-Agent":      "Go-http-client/1.1",
					},
				},
				TransactionInfo: &sentry.TransactionInfo{Source: "route"},
				Contexts: map[string]sentry.Context{
					"trace": sentry.TraceContext{
						Data: map[string]interface{}{
							"http.request.method":       http.MethodPost,
							"http.response.status_code": http.StatusOK,
						},
						Op:     "http.server",
						Status: sentry.SpanStatusOK,
					}.Map(),
				}},
			WantEvent: &sentry.Event{
				Level:   sentry.LevelInfo,
				Message: "post: 15 KB",
				Request: &sentry.Request{
					URL:    "/post/large",
					Method: "POST",
					// Actual request body omitted because too large.
					Data: "",
					Headers: map[string]string{
						"Accept-Encoding": "gzip",
						"Content-Length":  "15360",
						"User-Agent":      "Go-http-client/1.1",
					},
				},
			},
		},
		{
			RequestPath: "/post/body-ignored",
			RoutePath:   "/post/body-ignored",
			Method:      "POST",
			WantStatus:  200,
			Body:        "client sends, server ignores, SDK doesn't read",
			Handler: func(c *gin.Context) {
				hub := sentry.GetHubFromContext(c.Request.Context())
				hub.CaptureMessage("body ignored")
			},
			WantTransaction: &sentry.Event{
				Level:       sentry.LevelInfo,
				Type:        "transaction",
				Transaction: "POST /post/body-ignored",
				Request: &sentry.Request{
					URL:    "/post/body-ignored",
					Method: "POST",
					// Actual request body omitted because not read.
					Data: "",
					Headers: map[string]string{
						"Accept-Encoding": "gzip",
						"Content-Length":  strconv.Itoa(len("client sends, server ignores, SDK doesn't read")),
						"User-Agent":      "Go-http-client/1.1",
					},
				},
				TransactionInfo: &sentry.TransactionInfo{Source: "route"},
				Contexts: map[string]sentry.Context{
					"trace": sentry.TraceContext{
						Data: map[string]interface{}{
							"http.request.method":       http.MethodPost,
							"http.response.status_code": http.StatusOK,
						},
						Op:     "http.server",
						Status: sentry.SpanStatusOK,
					}.Map(),
				}},
			WantEvent: &sentry.Event{
				Level:   sentry.LevelInfo,
				Message: "body ignored",
				Request: &sentry.Request{
					URL:    "/post/body-ignored",
					Method: "POST",
					// Actual request body omitted because not read.
					Data: "",
					Headers: map[string]string{
						"Accept-Encoding": "gzip",
						"Content-Length":  "46",
						"User-Agent":      "Go-http-client/1.1",
					},
				},
			},
		},
		{
			RequestPath: "/badreq",
			RoutePath:   "/badreq",
			Method:      "GET",
			WantStatus:  400,
			Handler: func(c *gin.Context) {
				c.JSON(http.StatusBadRequest, gin.H{"status": "bad_request"})
			},
			WantTransaction: &sentry.Event{
				Level:       sentry.LevelInfo,
				Type:        "transaction",
				Transaction: "GET /badreq",
				Request: &sentry.Request{
					URL:    "/badreq",
					Method: "GET",
					Headers: map[string]string{
						"Accept-Encoding": "gzip",
						"User-Agent":      "Go-http-client/1.1",
					},
				},
				TransactionInfo: &sentry.TransactionInfo{Source: "route"},
				Contexts: map[string]sentry.Context{
					"trace": sentry.TraceContext{
						Data: map[string]interface{}{
							"http.request.method":       http.MethodGet,
							"http.response.status_code": http.StatusBadRequest,
						},
						Op:     "http.server",
						Status: sentry.SpanStatusInvalidArgument,
					}.Map(),
				}},
			WantEvent: nil,
		},
	}

	eventsCh := make(chan *sentry.Event, len(tests))
	transactionsCh := make(chan *sentry.Event, len(tests))
	err := sentry.Init(sentry.ClientOptions{
		EnableTracing:          true,
		TracesSampleRate:       1.0,
		TraceIgnoreStatusCodes: make([][]int, 0), // don't ignore any status codes
		BeforeSend: func(event *sentry.Event, hint *sentry.EventHint) *sentry.Event {
			eventsCh <- event
			return event
		},
		BeforeSendTransaction: func(tx *sentry.Event, hint *sentry.EventHint) *sentry.Event {
			fmt.Println("BeforeSendTransaction")
			transactionsCh <- tx
			return tx
		},
	})
	if err != nil {
		t.Fatal(err)
	}

	router := gin.New()
	router.Use(sentrygin.New(sentrygin.Options{}))

	for _, tt := range tests {
		router.Handle(tt.Method, tt.RoutePath, tt.Handler)
	}

	srv := httptest.NewServer(router)
	defer srv.Close()

	c := srv.Client()
	c.Timeout = time.Second

	var want []*sentry.Event
	var wanttrans []*sentry.Event
	var wantCodes []sentry.SpanStatus
	for _, tt := range tests {
		if tt.WantEvent != nil && tt.WantEvent.Request != nil {
			wantRequest := tt.WantEvent.Request
			wantRequest.URL = srv.URL + wantRequest.URL
			wantRequest.Headers["Host"] = srv.Listener.Addr().String()
			want = append(want, tt.WantEvent)
		}
		wantTransaction := tt.WantTransaction.Request
		wantTransaction.URL = srv.URL + wantTransaction.URL
		wantTransaction.Headers["Host"] = srv.Listener.Addr().String()
		wanttrans = append(wanttrans, tt.WantTransaction)
		wantCodes = append(wantCodes, sentry.HTTPtoSpanStatus(tt.WantStatus))

		req, err := http.NewRequest(tt.Method, srv.URL+tt.RequestPath, strings.NewReader(tt.Body))
		if err != nil {
			t.Fatal(err)
		}
		res, err := c.Do(req)
		if err != nil {
			t.Fatal(err)
		}
		if res.StatusCode != tt.WantStatus {
			t.Errorf("Status code = %d expected: %d", res.StatusCode, tt.WantStatus)
		}
		err = res.Body.Close()
		if err != nil {
			t.Fatal(err)
		}
	}

	if ok := sentry.Flush(testutils.FlushTimeout()); !ok {
		t.Fatal("sentry.Flush timed out")
	}
	close(eventsCh)
	var got []*sentry.Event
	for e := range eventsCh {
		got = append(got, e)
	}
	opts := cmp.Options{
		cmpopts.IgnoreFields(
			sentry.Event{},
			"Contexts", "EventID", "Extra", "Platform", "Modules",
			"Release", "Sdk", "ServerName", "Tags", "Timestamp",
			"sdkMetaData",
		),
		cmpopts.IgnoreFields(
			sentry.Request{},
			"Env",
		),
	}
	if diff := cmp.Diff(want, got, opts); diff != "" {
		t.Fatalf("Events mismatch (-want +got):\n%s", diff)
	}

	close(transactionsCh)
	var gott []*sentry.Event
	var statusCodes []sentry.SpanStatus
	for e := range transactionsCh {
		gott = append(gott, e)
		statusCodes = append(statusCodes, e.Contexts["trace"]["status"].(sentry.SpanStatus))
	}

	optstrans := cmp.Options{
		cmpopts.IgnoreFields(
			sentry.Event{},
			"EventID", "Platform", "Modules",
			"Release", "Sdk", "ServerName", "Timestamp",
			"sdkMetaData", "StartTime", "Spans",
		),
		cmpopts.IgnoreFields(
			sentry.Request{},
			"Env",
		),
		cmpopts.IgnoreMapEntries(func(k string, v any) bool {
			ignoredCtxEntries := []string{"span_id", "trace_id", "device", "os", "runtime"}
			for _, e := range ignoredCtxEntries {
				if k == e {
					return true
				}
			}
			return false
		}),
	}
	if diff := cmp.Diff(wanttrans, gott, optstrans); diff != "" {
		t.Fatalf("Transaction mismatch (-want +got):\n%s", diff)
	}

	if diff := cmp.Diff(wantCodes, statusCodes, cmp.Options{}); diff != "" {
		t.Fatalf("Transaction status codes mismatch (-want +got):\n%s", diff)
	}
}

func TestSetHubOnContext(t *testing.T) {
	hub := sentry.CurrentHub()
	ctx := &gin.Context{}
	sentrygin.SetHubOnContext(ctx, hub)
	got := sentrygin.GetHubFromContext(ctx)

	if !reflect.DeepEqual(hub, got) {
		t.Fatalf("Hub mismatch: got %v want %v", got, hub)
	}
}
