// Copyright 2014 Manu Martinez-Almeida. All rights reserved.
// Use of this source code is governed by a MIT style
// license that can be found in the LICENSE file.

package gin

import (
	"net"
	"net/http"
	"os"
	"strings"
	"syscall"
	"testing"

	"github.com/stretchr/testify/assert"
)

func TestPanicClean(t *testing.T) {
	buffer := new(strings.Builder)
	router := New()
	password := "my-super-secret-password"
	router.Use(RecoveryWithWriter(buffer))
	router.GET("/recovery", func(c *Context) {
		c.AbortWithStatus(http.StatusBadRequest)
		panic("Oupps, Houston, we have a problem")
	})
	// RUN
	w := PerformRequest(router, http.MethodGet, "/recovery",
		header{
			Key:   "Host",
			Value: "www.google.com",
		},
		header{
			Key:   "Authorization",
			Value: "Bearer " + password,
		},
		header{
			Key:   "Content-Type",
			Value: "application/json",
		},
	)
	// TEST
	assert.Equal(t, http.StatusBadRequest, w.Code)

	// Check the buffer does not have the secret key
	assert.NotContains(t, buffer.String(), password)
}

// TestPanicInHandler assert that panic has been recovered.
func TestPanicInHandler(t *testing.T) {
	buffer := new(strings.Builder)
	router := New()
	router.Use(RecoveryWithWriter(buffer))
	router.GET("/recovery", func(_ *Context) {
		panic("Oupps, Houston, we have a problem")
	})
	// RUN
	w := PerformRequest(router, http.MethodGet, "/recovery")
	// TEST
	assert.Equal(t, http.StatusInternalServerError, w.Code)
	assert.Contains(t, buffer.String(), "panic recovered")
	assert.Contains(t, buffer.String(), "Oupps, Houston, we have a problem")
	assert.Contains(t, buffer.String(), t.Name())
	assert.NotContains(t, buffer.String(), "GET /recovery")

	// Debug mode prints the request
	SetMode(DebugMode)
	// RUN
	w = PerformRequest(router, http.MethodGet, "/recovery")
	// TEST
	assert.Equal(t, http.StatusInternalServerError, w.Code)
	assert.Contains(t, buffer.String(), "GET /recovery")

	SetMode(TestMode)
}

// TestPanicWithAbort assert that panic has been recovered even if context.Abort was used.
func TestPanicWithAbort(t *testing.T) {
	router := New()
	router.Use(RecoveryWithWriter(nil))
	router.GET("/recovery", func(c *Context) {
		c.AbortWithStatus(http.StatusBadRequest)
		panic("Oupps, Houston, we have a problem")
	})
	// RUN
	w := PerformRequest(router, http.MethodGet, "/recovery")
	// TEST
	assert.Equal(t, http.StatusBadRequest, w.Code)
}

func TestSource(t *testing.T) {
	bs := source(nil, 0)
	assert.Equal(t, dunnoBytes, bs)

	in := [][]byte{
		[]byte("Hello world."),
		[]byte("Hi, gin.."),
	}
	bs = source(in, 10)
	assert.Equal(t, dunnoBytes, bs)

	bs = source(in, 1)
	assert.Equal(t, []byte("Hello world."), bs)
}

func TestFunction(t *testing.T) {
	bs := function(1)
	assert.Equal(t, dunno, bs)
}

// TestPanicWithBrokenPipe asserts that recovery specifically handles
// writing responses to broken pipes
func TestPanicWithBrokenPipe(t *testing.T) {
	const expectCode = 204

	expectMsgs := map[syscall.Errno]string{
		syscall.EPIPE:      "broken pipe",
		syscall.ECONNRESET: "connection reset by peer",
	}

	for errno, expectMsg := range expectMsgs {
		t.Run(expectMsg, func(t *testing.T) {
			var buf strings.Builder

			router := New()
			router.Use(RecoveryWithWriter(&buf))
			router.GET("/recovery", func(c *Context) {
				// Start writing response
				c.Header("X-Test", "Value")
				c.Status(expectCode)

				// Oops. Client connection closed
				e := &net.OpError{Err: &os.SyscallError{Err: errno}}
				panic(e)
			})
			// RUN
			w := PerformRequest(router, http.MethodGet, "/recovery")
			// TEST
			assert.Equal(t, expectCode, w.Code)
			assert.Contains(t, strings.ToLower(buf.String()), expectMsg)
		})
	}
}

func TestCustomRecoveryWithWriter(t *testing.T) {
	errBuffer := new(strings.Builder)
	buffer := new(strings.Builder)
	router := New()
	handleRecovery := func(c *Context, err any) {
		errBuffer.WriteString(err.(string))
		c.AbortWithStatus(http.StatusBadRequest)
	}
	router.Use(CustomRecoveryWithWriter(buffer, handleRecovery))
	router.GET("/recovery", func(_ *Context) {
		panic("Oupps, Houston, we have a problem")
	})
	// RUN
	w := PerformRequest(router, http.MethodGet, "/recovery")
	// TEST
	assert.Equal(t, http.StatusBadRequest, w.Code)
	assert.Contains(t, buffer.String(), "panic recovered")
	assert.Contains(t, buffer.String(), "Oupps, Houston, we have a problem")
	assert.Contains(t, buffer.String(), t.Name())
	assert.NotContains(t, buffer.String(), "GET /recovery")

	// Debug mode prints the request
	SetMode(DebugMode)
	// RUN
	w = PerformRequest(router, http.MethodGet, "/recovery")
	// TEST
	assert.Equal(t, http.StatusBadRequest, w.Code)
	assert.Contains(t, buffer.String(), "GET /recovery")

	assert.Equal(t, strings.Repeat("Oupps, Houston, we have a problem", 2), errBuffer.String())

	SetMode(TestMode)
}

func TestCustomRecovery(t *testing.T) {
	errBuffer := new(strings.Builder)
	buffer := new(strings.Builder)
	router := New()
	DefaultErrorWriter = buffer
	handleRecovery := func(c *Context, err any) {
		errBuffer.WriteString(err.(string))
		c.AbortWithStatus(http.StatusBadRequest)
	}
	router.Use(CustomRecovery(handleRecovery))
	router.GET("/recovery", func(_ *Context) {
		panic("Oupps, Houston, we have a problem")
	})
	// RUN
	w := PerformRequest(router, http.MethodGet, "/recovery")
	// TEST
	assert.Equal(t, http.StatusBadRequest, w.Code)
	assert.Contains(t, buffer.String(), "panic recovered")
	assert.Contains(t, buffer.String(), "Oupps, Houston, we have a problem")
	assert.Contains(t, buffer.String(), t.Name())
	assert.NotContains(t, buffer.String(), "GET /recovery")

	// Debug mode prints the request
	SetMode(DebugMode)
	// RUN
	w = PerformRequest(router, http.MethodGet, "/recovery")
	// TEST
	assert.Equal(t, http.StatusBadRequest, w.Code)
	assert.Contains(t, buffer.String(), "GET /recovery")

	assert.Equal(t, strings.Repeat("Oupps, Houston, we have a problem", 2), errBuffer.String())

	SetMode(TestMode)
}

func TestRecoveryWithWriterWithCustomRecovery(t *testing.T) {
	errBuffer := new(strings.Builder)
	buffer := new(strings.Builder)
	router := New()
	DefaultErrorWriter = buffer
	handleRecovery := func(c *Context, err any) {
		errBuffer.WriteString(err.(string))
		c.AbortWithStatus(http.StatusBadRequest)
	}
	router.Use(RecoveryWithWriter(DefaultErrorWriter, handleRecovery))
	router.GET("/recovery", func(_ *Context) {
		panic("Oupps, Houston, we have a problem")
	})
	// RUN
	w := PerformRequest(router, http.MethodGet, "/recovery")
	// TEST
	assert.Equal(t, http.StatusBadRequest, w.Code)
	assert.Contains(t, buffer.String(), "panic recovered")
	assert.Contains(t, buffer.String(), "Oupps, Houston, we have a problem")
	assert.Contains(t, buffer.String(), t.Name())
	assert.NotContains(t, buffer.String(), "GET /recovery")

	// Debug mode prints the request
	SetMode(DebugMode)
	// RUN
	w = PerformRequest(router, http.MethodGet, "/recovery")
	// TEST
	assert.Equal(t, http.StatusBadRequest, w.Code)
	assert.Contains(t, buffer.String(), "GET /recovery")

	assert.Equal(t, strings.Repeat("Oupps, Houston, we have a problem", 2), errBuffer.String())

	SetMode(TestMode)
}

func TestSecureRequestDump(t *testing.T) {
	tests := []struct {
		name           string
		req            *http.Request
		wantContains   string
		wantNotContain string
	}{
		{
			name: "Authorization header standard case",
			req: func() *http.Request {
				r, _ := http.NewRequest(http.MethodGet, "http://example.com", nil)
				r.Header.Set("Authorization", "Bearer secret-token")
				return r
			}(),
			wantContains:   "Authorization: *",
			wantNotContain: "Bearer secret-token",
		},
		{
			name: "authorization header lowercase",
			req: func() *http.Request {
				r, _ := http.NewRequest(http.MethodGet, "http://example.com", nil)
				r.Header.Set("authorization", "some-secret")
				return r
			}(),
			wantContains:   "Authorization: *",
			wantNotContain: "some-secret",
		},
		{
			name: "Authorization header mixed case",
			req: func() *http.Request {
				r, _ := http.NewRequest(http.MethodGet, "http://example.com", nil)
				r.Header.Set("AuThOrIzAtIoN", "token123")
				return r
			}(),
			wantContains:   "Authorization: *",
			wantNotContain: "token123",
		},
		{
			name: "No Authorization header",
			req: func() *http.Request {
				r, _ := http.NewRequest(http.MethodGet, "http://example.com", nil)
				r.Header.Set("Content-Type", "application/json")
				return r
			}(),
			wantContains:   "",
			wantNotContain: "Authorization: *",
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			result := secureRequestDump(tt.req)
			if tt.wantContains != "" && !strings.Contains(result, tt.wantContains) {
				t.Errorf("maskHeaders() = %q, want contains %q", result, tt.wantContains)
			}
			if tt.wantNotContain != "" && strings.Contains(result, tt.wantNotContain) {
				t.Errorf("maskHeaders() = %q, want NOT contain %q", result, tt.wantNotContain)
			}
		})
	}
}