package integration

import (
	"bytes"
	"encoding/json"
	"fmt"
	"net/http"
	"net/http/httptest"
	"os"
	"strings"
	"syscall"
	"time"

	"github.com/containous/traefik/integration/try"
	"github.com/containous/traefik/pkg/config"
	"github.com/go-check/check"
	checker "github.com/vdemeester/shakers"
)

// SimpleSuite
type SimpleSuite struct{ BaseSuite }

func (s *SimpleSuite) TestInvalidConfigShouldFail(c *check.C) {
	cmd, output := s.cmdTraefik(withConfigFile("fixtures/invalid_configuration.toml"))

	err := cmd.Start()
	c.Assert(err, checker.IsNil)
	defer cmd.Process.Kill()

	err = try.Do(500*time.Millisecond, func() error {
		expected := "Near line 0 (last key parsed ''): bare keys cannot contain '{'"
		actual := output.String()

		if !strings.Contains(actual, expected) {
			return fmt.Errorf("got %s, wanted %s", actual, expected)
		}

		return nil
	})
	c.Assert(err, checker.IsNil)
}

func (s *SimpleSuite) TestSimpleDefaultConfig(c *check.C) {
	cmd, _ := s.cmdTraefik(withConfigFile("fixtures/simple_default.toml"))

	err := cmd.Start()
	c.Assert(err, checker.IsNil)
	defer cmd.Process.Kill()

	// TODO validate : run on 80
	// Expected a 404 as we did not configure anything
	err = try.GetRequest("http://127.0.0.1:8000/", 1*time.Second, try.StatusCodeIs(http.StatusNotFound))
	c.Assert(err, checker.IsNil)
}

func (s *SimpleSuite) TestWithWebConfig(c *check.C) {
	cmd, _ := s.cmdTraefik(withConfigFile("fixtures/simple_web.toml"))

	err := cmd.Start()
	c.Assert(err, checker.IsNil)
	defer cmd.Process.Kill()

	err = try.GetRequest("http://127.0.0.1:8080/api/providers", 1*time.Second, try.StatusCodeIs(http.StatusOK))
	c.Assert(err, checker.IsNil)
}

func (s *SimpleSuite) TestPrintHelp(c *check.C) {
	cmd, output := s.cmdTraefik("--help")

	err := cmd.Start()
	c.Assert(err, checker.IsNil)
	defer cmd.Process.Kill()

	err = try.Do(500*time.Millisecond, func() error {
		expected := "Usage:"
		notExpected := "panic:"
		actual := output.String()

		if strings.Contains(actual, notExpected) {
			return fmt.Errorf("got %s", actual)
		}
		if !strings.Contains(actual, expected) {
			return fmt.Errorf("got %s, wanted %s", actual, expected)
		}

		return nil
	})
	c.Assert(err, checker.IsNil)
}

func (s *SimpleSuite) TestRequestAcceptGraceTimeout(c *check.C) {
	s.createComposeProject(c, "reqacceptgrace")
	s.composeProject.Start(c)

	whoami := "http://" + s.composeProject.Container(c, "whoami").NetworkSettings.IPAddress + ":80"

	file := s.adaptFile(c, "fixtures/reqacceptgrace.toml", struct {
		Server string
	}{whoami})
	defer os.Remove(file)
	cmd, display := s.traefikCmd(withConfigFile(file))
	defer display(c)
	err := cmd.Start()
	c.Assert(err, checker.IsNil)
	defer cmd.Process.Kill()

	// Wait for Traefik to turn ready.
	err = try.GetRequest("http://127.0.0.1:8000/", 2*time.Second, try.StatusCodeIs(http.StatusNotFound))
	c.Assert(err, checker.IsNil)

	// Make sure exposed service is ready.
	err = try.GetRequest("http://127.0.0.1:8000/service", 3*time.Second, try.StatusCodeIs(http.StatusOK))
	c.Assert(err, checker.IsNil)

	// Check that /ping endpoint is responding with 200.
	err = try.GetRequest("http://127.0.0.1:8001/ping", 3*time.Second, try.StatusCodeIs(http.StatusOK))
	c.Assert(err, checker.IsNil)

	// Send SIGTERM to Traefik.
	proc, err := os.FindProcess(cmd.Process.Pid)
	c.Assert(err, checker.IsNil)
	err = proc.Signal(syscall.SIGTERM)
	c.Assert(err, checker.IsNil)

	// Give Traefik time to process the SIGTERM and send a request half-way
	// into the request accepting grace period, by which requests should
	// still get served.
	time.Sleep(5 * time.Second)
	resp, err := http.Get("http://127.0.0.1:8000/service")
	c.Assert(err, checker.IsNil)
	defer resp.Body.Close()
	c.Assert(resp.StatusCode, checker.Equals, http.StatusOK)

	// ping endpoint should now return a Service Unavailable.
	resp, err = http.Get("http://127.0.0.1:8001/ping")
	c.Assert(err, checker.IsNil)
	defer resp.Body.Close()
	c.Assert(resp.StatusCode, checker.Equals, http.StatusServiceUnavailable)

	// Expect Traefik to shut down gracefully once the request accepting grace
	// period has elapsed.
	waitErr := make(chan error)
	go func() {
		waitErr <- cmd.Wait()
	}()

	select {
	case err := <-waitErr:
		c.Assert(err, checker.IsNil)
	case <-time.After(10 * time.Second):
		// By now we are ~5 seconds out of the request accepting grace period
		// (start + 5 seconds sleep prior to the mid-grace period request +
		// 10 seconds timeout = 15 seconds > 10 seconds grace period).
		// Something must have gone wrong if we still haven't terminated at
		// this point.
		c.Fatal("Traefik did not terminate in time")
	}
}

func (s *SimpleSuite) TestApiOnSameEntryPoint(c *check.C) {
	s.createComposeProject(c, "base")
	s.composeProject.Start(c)

	cmd, output := s.traefikCmd("--entryPoints=Name:http Address::8000", "--api.entryPoint=http", "--global.debug", "--providers.docker")
	defer output(c)

	err := cmd.Start()
	c.Assert(err, checker.IsNil)
	defer cmd.Process.Kill()

	// TODO validate : run on 80
	// Expected a 404 as we did not configure anything
	err = try.GetRequest("http://127.0.0.1:8000/test", 1*time.Second, try.StatusCodeIs(http.StatusNotFound))
	c.Assert(err, checker.IsNil)

	err = try.GetRequest("http://127.0.0.1:8000/api/providers/docker", 1*time.Second, try.StatusCodeIs(http.StatusOK))
	c.Assert(err, checker.IsNil)

	err = try.GetRequest("http://127.0.0.1:8000/api/providers/docker/routers", 1*time.Second, try.BodyContains("PathPrefix"))
	c.Assert(err, checker.IsNil)

	err = try.GetRequest("http://127.0.0.1:8000/whoami", 1*time.Second, try.StatusCodeIs(http.StatusOK))
	c.Assert(err, checker.IsNil)
}

func (s *SimpleSuite) TestStatsWithMultipleEntryPoint(c *check.C) {
	c.Skip("Stats is missing")
	s.createComposeProject(c, "stats")
	s.composeProject.Start(c)

	whoami1 := "http://" + s.composeProject.Container(c, "whoami1").NetworkSettings.IPAddress + ":80"
	whoami2 := "http://" + s.composeProject.Container(c, "whoami2").NetworkSettings.IPAddress + ":80"

	file := s.adaptFile(c, "fixtures/simple_stats.toml", struct {
		Server1 string
		Server2 string
	}{whoami1, whoami2})
	cmd, output := s.traefikCmd(withConfigFile(file))
	defer output(c)

	err := cmd.Start()
	c.Assert(err, checker.IsNil)
	defer cmd.Process.Kill()

	err = try.GetRequest("http://127.0.0.1:8080/api", 1*time.Second, try.StatusCodeIs(http.StatusOK))
	c.Assert(err, checker.IsNil)

	err = try.GetRequest("http://127.0.0.1:8080/api/providers/file/routers", 1*time.Second, try.BodyContains("PathPrefix"))
	c.Assert(err, checker.IsNil)

	err = try.GetRequest("http://127.0.0.1:8000/whoami", 1*time.Second, try.StatusCodeIs(http.StatusOK))
	c.Assert(err, checker.IsNil)

	err = try.GetRequest("http://127.0.0.1:8080/whoami", 1*time.Second, try.StatusCodeIs(http.StatusOK))
	c.Assert(err, checker.IsNil)

	err = try.GetRequest("http://127.0.0.1:8080/health", 1*time.Second, try.BodyContains(`"total_status_code_count":{"200":2}`))
	c.Assert(err, checker.IsNil)

}

func (s *SimpleSuite) TestNoAuthOnPing(c *check.C) {
	s.createComposeProject(c, "base")
	s.composeProject.Start(c)

	cmd, output := s.traefikCmd(withConfigFile("./fixtures/simple_auth.toml"))
	defer output(c)

	err := cmd.Start()
	c.Assert(err, checker.IsNil)
	defer cmd.Process.Kill()

	err = try.GetRequest("http://127.0.0.1:8001/api/providers", 2*time.Second, try.StatusCodeIs(http.StatusUnauthorized))
	c.Assert(err, checker.IsNil)

	err = try.GetRequest("http://127.0.0.1:8001/ping", 1*time.Second, try.StatusCodeIs(http.StatusOK))
	c.Assert(err, checker.IsNil)
}

func (s *SimpleSuite) TestDefaultEntrypointHTTP(c *check.C) {
	s.createComposeProject(c, "base")
	s.composeProject.Start(c)

	cmd, output := s.traefikCmd("--entryPoints=Name:http Address::8000", "--global.debug", "--providers.docker", "--api")
	defer output(c)

	err := cmd.Start()
	c.Assert(err, checker.IsNil)
	defer cmd.Process.Kill()

	err = try.GetRequest("http://127.0.0.1:8080/api/providers/docker/routers", 1*time.Second, try.BodyContains("PathPrefix"))
	c.Assert(err, checker.IsNil)

	err = try.GetRequest("http://127.0.0.1:8000/whoami", 1*time.Second, try.StatusCodeIs(http.StatusOK))
	c.Assert(err, checker.IsNil)
}

func (s *SimpleSuite) TestWithUnexistingEntrypoint(c *check.C) {
	s.createComposeProject(c, "base")
	s.composeProject.Start(c)

	cmd, output := s.traefikCmd("--entryPoints=Name:http Address::8000", "--global.debug", "--providers.docker", "--api")
	defer output(c)

	err := cmd.Start()
	c.Assert(err, checker.IsNil)
	defer cmd.Process.Kill()

	err = try.GetRequest("http://127.0.0.1:8080/api/providers/docker/routers", 1*time.Second, try.BodyContains("PathPrefix"))
	c.Assert(err, checker.IsNil)

	err = try.GetRequest("http://127.0.0.1:8000/whoami", 1*time.Second, try.StatusCodeIs(http.StatusOK))
	c.Assert(err, checker.IsNil)
}

func (s *SimpleSuite) TestMetricsPrometheusDefaultEntrypoint(c *check.C) {
	s.createComposeProject(c, "base")
	s.composeProject.Start(c)

	cmd, output := s.traefikCmd("--entryPoints=Name:http Address::8000", "--api", "--metrics.prometheus.buckets=0.1,0.3,1.2,5.0", "--providers.docker", "--global.debug")
	defer output(c)

	err := cmd.Start()
	c.Assert(err, checker.IsNil)
	defer cmd.Process.Kill()

	err = try.GetRequest("http://127.0.0.1:8080/api/providers/docker/routers", 1*time.Second, try.BodyContains("PathPrefix"))
	c.Assert(err, checker.IsNil)

	err = try.GetRequest("http://127.0.0.1:8000/whoami", 1*time.Second, try.StatusCodeIs(http.StatusOK))
	c.Assert(err, checker.IsNil)

	err = try.GetRequest("http://127.0.0.1:8080/metrics", 1*time.Second, try.StatusCodeIs(http.StatusOK))
	c.Assert(err, checker.IsNil)
}

func (s *SimpleSuite) TestMultipleProviderSameBackendName(c *check.C) {
	s.createComposeProject(c, "base")
	s.composeProject.Start(c)

	ipWhoami01 := s.composeProject.Container(c, "whoami1").NetworkSettings.IPAddress
	ipWhoami02 := s.composeProject.Container(c, "whoami2").NetworkSettings.IPAddress
	file := s.adaptFile(c, "fixtures/multiple_provider.toml", struct{ IP string }{
		IP: ipWhoami02,
	})
	defer os.Remove(file)

	cmd, output := s.traefikCmd(withConfigFile(file))
	defer output(c)

	err := cmd.Start()
	c.Assert(err, checker.IsNil)
	defer cmd.Process.Kill()

	err = try.GetRequest("http://127.0.0.1:8080/api/providers/file/routers", 1*time.Second, try.BodyContains("PathPrefix"))
	c.Assert(err, checker.IsNil)

	err = try.GetRequest("http://127.0.0.1:8000/whoami", 1*time.Second, try.BodyContains(ipWhoami01))
	c.Assert(err, checker.IsNil)

	err = try.GetRequest("http://127.0.0.1:8000/file", 1*time.Second, try.BodyContains(ipWhoami02))
	c.Assert(err, checker.IsNil)

}

func (s *SimpleSuite) TestIPStrategyWhitelist(c *check.C) {
	s.createComposeProject(c, "whitelist")
	s.composeProject.Start(c)

	cmd, output := s.traefikCmd(withConfigFile("fixtures/simple_whitelist.toml"))
	defer output(c)

	err := cmd.Start()
	c.Assert(err, checker.IsNil)
	defer cmd.Process.Kill()

	err = try.GetRequest("http://127.0.0.1:8080/api/providers/docker/routers", 2*time.Second, try.BodyContains("override"))
	c.Assert(err, checker.IsNil)

	err = try.GetRequest("http://127.0.0.1:8080/api/providers/docker/routers", 2*time.Second, try.BodyContains("override.remoteaddr.whitelist.docker.local"))
	c.Assert(err, checker.IsNil)

	testCases := []struct {
		desc               string
		xForwardedFor      string
		host               string
		expectedStatusCode int
	}{
		// {
		// 	desc:               "default client ip strategy accept",
		// 	xForwardedFor:      "8.8.8.8,127.0.0.1",
		// 	host:               "no.override.whitelist.docker.local",
		// 	expectedStatusCode: 200,
		// },
		// FIXME add clientipstrategy and forwarded headers on entrypoint
		// {
		// 	desc:               "default client ip strategy reject",
		// 	xForwardedFor:      "8.8.8.10,127.0.0.1",
		// 	host:               "no.override.whitelist.docker.local",
		// 	expectedStatusCode: 403,
		// },
		{
			desc:               "override remote addr reject",
			xForwardedFor:      "8.8.8.8,8.8.8.8",
			host:               "override.remoteaddr.whitelist.docker.local",
			expectedStatusCode: 403,
		},
		{
			desc:               "override depth accept",
			xForwardedFor:      "8.8.8.8,10.0.0.1,127.0.0.1",
			host:               "override.depth.whitelist.docker.local",
			expectedStatusCode: 200,
		},
		{
			desc:               "override depth reject",
			xForwardedFor:      "10.0.0.1,8.8.8.8,127.0.0.1",
			host:               "override.depth.whitelist.docker.local",
			expectedStatusCode: 403,
		},
		{
			desc:               "override excludedIPs reject",
			xForwardedFor:      "10.0.0.3,10.0.0.1,10.0.0.2",
			host:               "override.excludedips.whitelist.docker.local",
			expectedStatusCode: 403,
		},
		{
			desc:               "override excludedIPs accept",
			xForwardedFor:      "8.8.8.8,10.0.0.1,10.0.0.2",
			host:               "override.excludedips.whitelist.docker.local",
			expectedStatusCode: 200,
		},
	}

	for _, test := range testCases {
		req := httptest.NewRequest(http.MethodGet, "http://127.0.0.1:8000", nil)
		req.Header.Set("X-Forwarded-For", test.xForwardedFor)
		req.Host = test.host
		req.RequestURI = ""

		err = try.Request(req, 1*time.Second, try.StatusCodeIs(test.expectedStatusCode))
		if err != nil {
			c.Fatalf("Error while %s: %v", test.desc, err)
		}
	}
}

func (s *SimpleSuite) TestXForwardedHeaders(c *check.C) {
	s.createComposeProject(c, "whitelist")
	s.composeProject.Start(c)

	cmd, output := s.traefikCmd(withConfigFile("fixtures/simple_whitelist.toml"))
	defer output(c)

	err := cmd.Start()
	c.Assert(err, checker.IsNil)
	defer cmd.Process.Kill()

	err = try.GetRequest("http://127.0.0.1:8080/api/providers/docker/routers", 2*time.Second,
		try.BodyContains("override.remoteaddr.whitelist.docker.local"))
	c.Assert(err, checker.IsNil)

	req, err := http.NewRequest(http.MethodGet, "http://127.0.0.1:8000", nil)
	c.Assert(err, checker.IsNil)

	req.Host = "override.depth.whitelist.docker.local"
	req.Header.Set("X-Forwarded-For", "8.8.8.8,10.0.0.1,127.0.0.1")

	err = try.Request(req, 1*time.Second,
		try.StatusCodeIs(http.StatusOK),
		try.BodyContains("X-Forwarded-Proto", "X-Forwarded-For", "X-Forwarded-Host",
			"X-Forwarded-Host", "X-Forwarded-Port", "X-Forwarded-Server", "X-Real-Ip"))
	c.Assert(err, checker.IsNil)
}

func (s *SimpleSuite) TestMultiprovider(c *check.C) {
	s.createComposeProject(c, "base")
	s.composeProject.Start(c)

	server := "http://" + s.composeProject.Container(c, "whoami1").NetworkSettings.IPAddress

	file := s.adaptFile(c, "fixtures/multiprovider.toml", struct {
		Server string
	}{Server: server})
	defer os.Remove(file)

	cmd, output := s.traefikCmd(withConfigFile(file))
	defer output(c)

	err := cmd.Start()
	c.Assert(err, checker.IsNil)
	defer cmd.Process.Kill()

	err = try.GetRequest("http://127.0.0.1:8080/api/providers/file/services", 1000*time.Millisecond, try.BodyContains("service"))
	c.Assert(err, checker.IsNil)

	config := config.HTTPConfiguration{
		Routers: map[string]*config.Router{
			"router1": {
				EntryPoints: []string{"web"},
				Middlewares: []string{"file.customheader"},
				Service:     "file.service",
				Rule:        "PathPrefix(`/`)",
			},
		},
	}

	json, err := json.Marshal(config)
	c.Assert(err, checker.IsNil)

	request, err := http.NewRequest(http.MethodPut, "http://127.0.0.1:8080/api/providers/rest", bytes.NewReader(json))
	c.Assert(err, checker.IsNil)

	response, err := http.DefaultClient.Do(request)
	c.Assert(err, checker.IsNil)
	c.Assert(response.StatusCode, checker.Equals, http.StatusOK)

	err = try.GetRequest("http://127.0.0.1:8080/api/providers/rest/routers", 1000*time.Millisecond, try.BodyContains("PathPrefix(`/`)"))
	c.Assert(err, checker.IsNil)

	err = try.GetRequest("http://127.0.0.1:8000/", 1*time.Second, try.StatusCodeIs(http.StatusOK), try.BodyContains("CustomValue"))
	c.Assert(err, checker.IsNil)

}

func (s *SimpleSuite) TestSimpleConfigurationHostRequestTrailingPeriod(c *check.C) {
	s.createComposeProject(c, "base")
	s.composeProject.Start(c)

	server := "http://" + s.composeProject.Container(c, "whoami1").NetworkSettings.IPAddress

	file := s.adaptFile(c, "fixtures/file/simple-hosts.toml", struct {
		Server string
	}{Server: server})
	defer os.Remove(file)

	cmd, output := s.traefikCmd(withConfigFile(file))
	defer output(c)

	err := cmd.Start()
	c.Assert(err, checker.IsNil)
	defer cmd.Process.Kill()

	testCases := []struct {
		desc        string
		requestHost string
	}{
		{
			desc:        "Request host without trailing period, rule without trailing period",
			requestHost: "test.localhost",
		},
		{
			desc:        "Request host with trailing period, rule without trailing period",
			requestHost: "test.localhost.",
		},
		{
			desc:        "Request host without trailing period, rule with trailing period",
			requestHost: "test.foo.localhost",
		},
		{
			desc:        "Request host with trailing period, rule with trailing period",
			requestHost: "test.foo.localhost.",
		},
	}

	for _, test := range testCases {
		req, err := http.NewRequest(http.MethodGet, "http://127.0.0.1:8000", nil)
		c.Assert(err, checker.IsNil)
		req.Host = test.requestHost
		err = try.Request(req, 1*time.Second, try.StatusCodeIs(http.StatusOK))
		if err != nil {
			c.Fatalf("Error while testing %s: %v", test.desc, err)
		}
	}
}