package tests

import (
	"bufio"
	"encoding/json"
	"errors"
	"fmt"
	"io"
	"net"
	"strconv"
	"testing"
	"time"

	"github.com/garyburd/redigo/redis"
	"github.com/tidwall/gjson"
)

func subTestFence(t *testing.T, mc *mockServer) {
	runStep(t, mc, "basic", json_FENCE_basic_test)
}

type fenceReader struct {
	conn net.Conn
	rd   *bufio.Reader
}

func (fr *fenceReader) receive() (string, error) {
	if err := fr.conn.SetReadDeadline(time.Now().Add(time.Second)); err != nil {
		return "", err
	}
	line, err := fr.rd.ReadBytes('\n')
	if err != nil {
		return "", err
	}
	if len(line) < 4 || line[0] != '$' || line[len(line)-2] != '\r' || line[len(line)-1] != '\n' {
		return "", errors.New("invalid message")
	}
	n, err := strconv.ParseUint(string(line[1:len(line)-2]), 10, 64)
	if err != nil {
		return "", err
	}
	buf := make([]byte, int(n)+2)
	_, err = io.ReadFull(fr.rd, buf)
	if err != nil {
		return "", err
	}
	if buf[len(buf)-2] != '\r' || buf[len(buf)-1] != '\n' {
		return "", errors.New("invalid message")
	}
	js := buf[:len(buf)-2]
	var m interface{}
	if err := json.Unmarshal(js, &m); err != nil {
		return "", err
	}
	return string(js), nil
}

func (fr *fenceReader) receiveExpect(valex ...string) error {
	s, err := fr.receive()
	if err != nil {
		return err
	}
	for i := 0; i < len(valex); i += 2 {
		if gjson.Get(s, valex[i]).String() != valex[i+1] {
			return fmt.Errorf("expected '%s'='%s', got '%s'", valex[i], valex[i+1], gjson.Get(s, valex[i]).String())
		}
	}
	return nil
}

func json_FENCE_basic_test(mc *mockServer) error {
	conn, err := net.Dial("tcp", fmt.Sprintf(":%d", mc.port))
	if err != nil {
		return err
	}
	defer conn.Close()
	_, err = fmt.Fprintf(conn, "NEARBY mykey FENCE POINT 33 -115 5000\r\n")
	if err != nil {
		return err
	}

	buf := make([]byte, 4096)
	n, err := conn.Read(buf)
	if err != nil {
		return err
	}
	res := string(buf[:n])
	if res != "+OK\r\n" {
		return fmt.Errorf("expected OK, got '%v'", res)
	}
	rd := &fenceReader{conn, bufio.NewReader(conn)}

	// send a point
	c, err := redis.Dial("tcp", fmt.Sprintf(":%d", mc.port))
	if err != nil {
		return err
	}
	defer c.Close()

	res, err = redis.String(c.Do("SET", "mykey", "myid1", "POINT", 33, -115))
	if err != nil {
		return err
	}
	if res != "OK" {
		return fmt.Errorf("expected OK, got '%v'", res)
	}

	// receive the message
	if err := rd.receiveExpect("command", "set",
		"detect", "enter",
		"key", "mykey",
		"id", "myid1",
		"object.type", "Point",
		"object.coordinates", "[-115,33]"); err != nil {
		return err
	}

	if err := rd.receiveExpect("command", "set",
		"detect", "inside",
		"key", "mykey",
		"id", "myid1",
		"object.type", "Point",
		"object.coordinates", "[-115,33]"); err != nil {
		return err
	}

	res, err = redis.String(c.Do("SET", "mykey", "myid1", "POINT", 34, -115))
	if err != nil {
		return err
	}
	if res != "OK" {
		return fmt.Errorf("expected OK, got '%v'", res)
	}

	// receive the message
	if err := rd.receiveExpect("command", "set",
		"detect", "exit",
		"key", "mykey",
		"id", "myid1",
		"object.type", "Point",
		"object.coordinates", "[-115,34]"); err != nil {
		return err
	}

	if err := rd.receiveExpect("command", "set",
		"detect", "outside",
		"key", "mykey",
		"id", "myid1",
		"object.type", "Point",
		"object.coordinates", "[-115,34]"); err != nil {
		return err
	}
	return nil
}