package keepclient

import (
	"flag"
	"fmt"
	. "gopkg.in/check.v1"
	"io"
	"io/ioutil"
	"log"
	"net"
	"net/http"
	"os"
	"os/exec"
	"testing"
	"time"
)

// Gocheck boilerplate
func Test(t *testing.T) { TestingT(t) }

// Gocheck boilerplate
var _ = Suite(&ServerRequiredSuite{})
var _ = Suite(&StandaloneSuite{})

var no_server = flag.Bool("no-server", false, "Skip 'ServerRequireSuite'")

// Tests that require the Keep server running
type ServerRequiredSuite struct{}

// Standalone tests
type StandaloneSuite struct{}

func (s *ServerRequiredSuite) SetUpSuite(c *C) {
	if *no_server {
		c.Skip("Skipping tests that require server")
	} else {
		os.Chdir(os.ExpandEnv("$GOPATH../python"))
		exec.Command("python", "run_test_server.py", "start").Run()
		exec.Command("python", "run_test_server.py", "start_keep").Run()
	}
}

func (s *ServerRequiredSuite) TearDownSuite(c *C) {
	os.Chdir(os.ExpandEnv("$GOPATH../python"))
	exec.Command("python", "run_test_server.py", "stop_keep").Run()
	exec.Command("python", "run_test_server.py", "stop").Run()
}

func (s *ServerRequiredSuite) TestInit(c *C) {
	os.Setenv("ARVADOS_API_HOST", "localhost:3001")
	os.Setenv("ARVADOS_API_TOKEN", "4axaw8zxe0qm22wa6urpp5nskcne8z88cvbupv653y1njyi05h")
	os.Setenv("ARVADOS_API_HOST_INSECURE", "")

	kc, err := MakeKeepClient()
	c.Assert(kc.ApiServer, Equals, "localhost:3001")
	c.Assert(kc.ApiToken, Equals, "4axaw8zxe0qm22wa6urpp5nskcne8z88cvbupv653y1njyi05h")
	c.Assert(kc.ApiInsecure, Equals, false)

	os.Setenv("ARVADOS_API_HOST_INSECURE", "true")

	kc, err = MakeKeepClient()
	c.Assert(kc.ApiServer, Equals, "localhost:3001")
	c.Assert(kc.ApiToken, Equals, "4axaw8zxe0qm22wa6urpp5nskcne8z88cvbupv653y1njyi05h")
	c.Assert(kc.ApiInsecure, Equals, true)

	c.Assert(err, Equals, nil)
	c.Assert(len(kc.Service_roots), Equals, 2)
	c.Assert(kc.Service_roots[0], Equals, "http://localhost:25107")
	c.Assert(kc.Service_roots[1], Equals, "http://localhost:25108")
}

func (s *StandaloneSuite) TestShuffleServiceRoots(c *C) {
	kc := KeepClient{Service_roots: []string{"http://localhost:25107", "http://localhost:25108", "http://localhost:25109", "http://localhost:25110", "http://localhost:25111", "http://localhost:25112", "http://localhost:25113", "http://localhost:25114", "http://localhost:25115", "http://localhost:25116", "http://localhost:25117", "http://localhost:25118", "http://localhost:25119", "http://localhost:25120", "http://localhost:25121", "http://localhost:25122", "http://localhost:25123"}}

	// "foo" acbd18db4cc2f85cedef654fccc4a4d8
	foo_shuffle := []string{"http://localhost:25116", "http://localhost:25120", "http://localhost:25119", "http://localhost:25122", "http://localhost:25108", "http://localhost:25114", "http://localhost:25112", "http://localhost:25107", "http://localhost:25118", "http://localhost:25111", "http://localhost:25113", "http://localhost:25121", "http://localhost:25110", "http://localhost:25117", "http://localhost:25109", "http://localhost:25115", "http://localhost:25123"}
	c.Check(kc.ShuffledServiceRoots("acbd18db4cc2f85cedef654fccc4a4d8"), DeepEquals, foo_shuffle)

	// "bar" 37b51d194a7513e45b56f6524f2d51f2
	bar_shuffle := []string{"http://localhost:25108", "http://localhost:25112", "http://localhost:25119", "http://localhost:25107", "http://localhost:25110", "http://localhost:25116", "http://localhost:25122", "http://localhost:25120", "http://localhost:25121", "http://localhost:25117", "http://localhost:25111", "http://localhost:25123", "http://localhost:25118", "http://localhost:25113", "http://localhost:25114", "http://localhost:25115", "http://localhost:25109"}
	c.Check(kc.ShuffledServiceRoots("37b51d194a7513e45b56f6524f2d51f2"), DeepEquals, bar_shuffle)
}

func ReadIntoBufferHelper(c *C, bufsize int) {
	buffer := make([]byte, bufsize)

	reader, writer := io.Pipe()
	slices := make(chan ReaderSlice)

	go ReadIntoBuffer(buffer, reader, slices)

	{
		out := make([]byte, 128)
		for i := 0; i < 128; i += 1 {
			out[i] = byte(i)
		}
		writer.Write(out)
		s1 := <-slices
		c.Check(len(s1.slice), Equals, 128)
		c.Check(s1.reader_error, Equals, nil)
		for i := 0; i < 128; i += 1 {
			c.Check(s1.slice[i], Equals, byte(i))
		}
		for i := 0; i < len(buffer); i += 1 {
			if i < 128 {
				c.Check(buffer[i], Equals, byte(i))
			} else {
				c.Check(buffer[i], Equals, byte(0))
			}
		}
	}
	{
		out := make([]byte, 96)
		for i := 0; i < 96; i += 1 {
			out[i] = byte(i / 2)
		}
		writer.Write(out)
		s1 := <-slices
		c.Check(len(s1.slice), Equals, 96)
		c.Check(s1.reader_error, Equals, nil)
		for i := 0; i < 96; i += 1 {
			c.Check(s1.slice[i], Equals, byte(i/2))
		}
		for i := 0; i < len(buffer); i += 1 {
			if i < 128 {
				c.Check(buffer[i], Equals, byte(i))
			} else if i < (128 + 96) {
				c.Check(buffer[i], Equals, byte((i-128)/2))
			} else {
				c.Check(buffer[i], Equals, byte(0))
			}
		}
	}
	{
		writer.Close()
		s1 := <-slices
		c.Check(len(s1.slice), Equals, 0)
		c.Check(s1.reader_error, Equals, io.EOF)
	}
}

func (s *StandaloneSuite) TestReadIntoBuffer(c *C) {
	ReadIntoBufferHelper(c, 512)
	ReadIntoBufferHelper(c, 225)
	ReadIntoBufferHelper(c, 224)
}

func (s *StandaloneSuite) TestReadIntoShortBuffer(c *C) {
	buffer := make([]byte, 223)
	reader, writer := io.Pipe()
	slices := make(chan ReaderSlice)

	go ReadIntoBuffer(buffer, reader, slices)

	{
		out := make([]byte, 128)
		for i := 0; i < 128; i += 1 {
			out[i] = byte(i)
		}
		writer.Write(out)
		s1 := <-slices
		c.Check(len(s1.slice), Equals, 128)
		c.Check(s1.reader_error, Equals, nil)
		for i := 0; i < 128; i += 1 {
			c.Check(s1.slice[i], Equals, byte(i))
		}
		for i := 0; i < len(buffer); i += 1 {
			if i < 128 {
				c.Check(buffer[i], Equals, byte(i))
			} else {
				c.Check(buffer[i], Equals, byte(0))
			}
		}
	}
	{
		out := make([]byte, 96)
		for i := 0; i < 96; i += 1 {
			out[i] = byte(i / 2)
		}

		// Write will deadlock because it can't write all the data, so
		// spin it off to a goroutine
		go writer.Write(out)
		s1 := <-slices

		c.Check(len(s1.slice), Equals, 95)
		c.Check(s1.reader_error, Equals, nil)
		for i := 0; i < 95; i += 1 {
			c.Check(s1.slice[i], Equals, byte(i/2))
		}
		for i := 0; i < len(buffer); i += 1 {
			if i < 128 {
				c.Check(buffer[i], Equals, byte(i))
			} else if i < (128 + 95) {
				c.Check(buffer[i], Equals, byte((i-128)/2))
			} else {
				c.Check(buffer[i], Equals, byte(0))
			}
		}
	}
	{
		writer.Close()
		s1 := <-slices
		c.Check(len(s1.slice), Equals, 0)
		c.Check(s1.reader_error, Equals, io.ErrShortBuffer)
	}

}

func (s *StandaloneSuite) TestTransfer(c *C) {
	reader, writer := io.Pipe()

	// Buffer for reads from 'r'
	buffer := make([]byte, 512)

	// Read requests on Transfer() buffer
	requests := make(chan ReadRequest)
	defer close(requests)

	// Reporting reader error states
	reader_status := make(chan error)

	go Transfer(buffer, reader, requests, reader_status)

	br1 := MakeBufferReader(requests)
	out := make([]byte, 128)

	{
		// Write some data, and read into a buffer shorter than
		// available data
		for i := 0; i < 128; i += 1 {
			out[i] = byte(i)
		}

		writer.Write(out[:100])

		in := make([]byte, 64)
		n, err := br1.Read(in)

		c.Check(n, Equals, 64)
		c.Check(err, Equals, nil)

		for i := 0; i < 64; i += 1 {
			c.Check(in[i], Equals, out[i])
		}
	}

	{
		// Write some more data, and read into buffer longer than
		// available data
		in := make([]byte, 64)
		n, err := br1.Read(in)
		c.Check(n, Equals, 36)
		c.Check(err, Equals, nil)

		for i := 0; i < 36; i += 1 {
			c.Check(in[i], Equals, out[64+i])
		}

	}

	{
		// Test read before write
		type Rd struct {
			n   int
			err error
		}
		rd := make(chan Rd)
		in := make([]byte, 64)

		go func() {
			n, err := br1.Read(in)
			rd <- Rd{n, err}
		}()

		time.Sleep(100 * time.Millisecond)
		writer.Write(out[100:])

		got := <-rd

		c.Check(got.n, Equals, 28)
		c.Check(got.err, Equals, nil)

		for i := 0; i < 28; i += 1 {
			c.Check(in[i], Equals, out[100+i])
		}
	}

	br2 := MakeBufferReader(requests)
	{
		// Test 'catch up' reader
		in := make([]byte, 256)
		n, err := br2.Read(in)

		c.Check(n, Equals, 128)
		c.Check(err, Equals, nil)

		for i := 0; i < 128; i += 1 {
			c.Check(in[i], Equals, out[i])
		}
	}

	{
		// Test closing the reader
		writer.Close()
		status := <-reader_status
		c.Check(status, Equals, io.EOF)

		in := make([]byte, 256)
		n1, err1 := br1.Read(in)
		n2, err2 := br2.Read(in)
		c.Check(n1, Equals, 0)
		c.Check(err1, Equals, io.EOF)
		c.Check(n2, Equals, 0)
		c.Check(err2, Equals, io.EOF)
	}

	{
		// Test 'catch up' reader after closing
		br3 := MakeBufferReader(requests)
		in := make([]byte, 256)
		n, err := br3.Read(in)

		c.Check(n, Equals, 128)
		c.Check(err, Equals, nil)

		for i := 0; i < 128; i += 1 {
			c.Check(in[i], Equals, out[i])
		}

		n, err = br3.Read(in)

		c.Check(n, Equals, 0)
		c.Check(err, Equals, io.EOF)
	}
}

func (s *StandaloneSuite) TestTransferShortBuffer(c *C) {
	reader, writer := io.Pipe()

	// Buffer for reads from 'r'
	buffer := make([]byte, 100)

	// Read requests on Transfer() buffer
	requests := make(chan ReadRequest)
	defer close(requests)

	// Reporting reader error states
	reader_status := make(chan error)

	go Transfer(buffer, reader, requests, reader_status)

	out := make([]byte, 101)
	go writer.Write(out)

	status := <-reader_status
	c.Check(status, Equals, io.ErrShortBuffer)
}

type StubHandler struct {
	c              *C
	expectPath     string
	expectApiToken string
	expectBody     string
	handled        chan bool
}

func (this StubHandler) ServeHTTP(resp http.ResponseWriter, req *http.Request) {
	this.c.Check(req.URL.Path, Equals, "/"+this.expectPath)
	this.c.Check(req.Header.Get("Authorization"), Equals, fmt.Sprintf("OAuth2 %s", this.expectApiToken))
	body, err := ioutil.ReadAll(req.Body)
	this.c.Check(err, Equals, nil)
	this.c.Check(body, DeepEquals, []byte(this.expectBody))
	resp.WriteHeader(200)
	this.handled <- true
}

func UploadToStubHelper(c *C, f func(*KeepClient, string, StubHandler,
	io.ReadCloser, io.WriteCloser, chan UploadError)) {

	st := StubHandler{
		c,
		"acbd18db4cc2f85cedef654fccc4a4d8",
		"abc123",
		"foo",
		make(chan bool)}
	server := http.Server{Handler: st}

	listener, _ := net.ListenTCP("tcp", &net.TCPAddr{})
	defer listener.Close()

	url := fmt.Sprintf("http://localhost:%d", listener.Addr().(*net.TCPAddr).Port)

	go server.Serve(listener)
	kc, _ := MakeKeepClient()
	kc.ApiToken = "abc123"

	reader, writer := io.Pipe()
	upload_status := make(chan UploadError)

	f(kc, url, st, reader, writer, upload_status)
}

func (s *StandaloneSuite) TestUploadToStubKeepServer(c *C) {
	log.Printf("Started TestUploadToStubKeepServer")

	UploadToStubHelper(c, func(kc *KeepClient, url string, st StubHandler,
		reader io.ReadCloser, writer io.WriteCloser, upload_status chan UploadError) {

		go kc.uploadToKeepServer(url, st.expectPath, reader, upload_status)

		writer.Write([]byte("foo"))
		writer.Close()

		<-st.handled
		status := <-upload_status
		c.Check(status, DeepEquals, UploadError{io.EOF, fmt.Sprintf("%s/%s", url, st.expectPath)})
	})
}

func (s *StandaloneSuite) TestUploadToStubKeepServerBufferReader(c *C) {
	log.Printf("Started TestUploadToStubKeepServerBufferReader")

	UploadToStubHelper(c, func(kc *KeepClient, url string, st StubHandler,
		reader io.ReadCloser, writer io.WriteCloser, upload_status chan UploadError) {

		// Buffer for reads from 'r'
		buffer := make([]byte, 512)

		// Read requests on Transfer() buffer
		requests := make(chan ReadRequest)
		defer close(requests)

		// Reporting reader error states
		reader_status := make(chan error)

		go Transfer(buffer, reader, requests, reader_status)

		br1 := MakeBufferReader(requests)

		go kc.uploadToKeepServer(url, st.expectPath, br1, upload_status)

		writer.Write([]byte("foo"))
		writer.Close()

		<-reader_status
		<-st.handled

		status := <-upload_status
		c.Check(status, DeepEquals, UploadError{io.EOF, fmt.Sprintf("%s/%s", url, st.expectPath)})

		//c.Check(true, Equals, false)
	})
}

type FailHandler struct {
	handled chan bool
}

func (this FailHandler) ServeHTTP(resp http.ResponseWriter, req *http.Request) {
	resp.WriteHeader(400)
	this.handled <- true
}

/*func (s *StandaloneSuite) TestFailedUploadToStubKeepServer(c *C) {
	log.Printf("blup")

	c.Check(true, Equals, false)

	log.Printf("blug")

	st := FailHandler{make(chan bool)}
	server := http.Server{Handler: st}

	listener, _ := net.ListenTCP("tcp", &net.TCPAddr{})
	defer listener.Close()

	go server.Serve(listener)
	kc, _ := MakeKeepClient()
	kc.ApiToken = "abc123"

	reader, writer := io.Pipe()
	upload_status := make(chan UploadError)

	go kc.uploadToKeepServer(fmt.Sprintf("http://localhost:%s", listener.Addr().String()), "acbd18db4cc2f85cedef654fccc4a4d8", reader, upload_status)

	log.Printf("Writing 1")

	writer.Write([]byte("foo"))

	log.Printf("Writing 2")

	writer.Close()

	log.Printf("Writing 3")

	<-st.handled

	log.Printf("Handled?!")

	status := <-upload_status
	c.Check(status, DeepEquals, UploadError{io.EOF, "http://localhost:2999/acbd18db4cc2f85cedef654fccc4a4d8"})
}*/