package remote

import (
	"bytes"
	"fmt"
	"io"
	"io/ioutil"
	"net/http"
	"text/tabwriter"

	stypes "git.cryptic.systems/fh-trier/go-flucky-server/pkg/types"
	"git.cryptic.systems/fh-trier/go-flucky/pkg/config"
	"git.cryptic.systems/fh-trier/go-flucky/pkg/types"
)

func Add(remote *types.Remote, configDir string) error {

	configuration, err := config.Read(configDir)
	if err != nil {
		return err
	}

	// search after duplicate remote_names
	for _, r := range configuration.Remotes {
		if r.Name == remote.Name {
			return fmt.Errorf("Remote-Name %v already exists", remote.Name)
		}
	}

	configuration.Remotes = append(configuration.Remotes, remote)

	if err := config.Write(configuration, configDir); err != nil {
		return err
	}

	return nil
}

func List(w io.Writer, configDir string) error {

	configuration, err := config.Read(configDir)
	if err != nil {
		return err
	}

	tw := tabwriter.NewWriter(w, 0, 0, 5, ' ', 0)

	fmt.Fprint(tw, "name\taddress\tregistered\n")

	for _, remote := range configuration.Remotes {
		fmt.Fprintf(tw, "%v\t%v\t%v\n", remote.Name, remote.Address, remote.Registered)
	}

	tw.Flush()

	return nil
}

func Remove(name string, configDir string) error {

	con, err := config.Read(configDir)
	if err != nil {
		return err
	}

	var j int
	for _, remote := range con.Remotes {
		if remote.Name == name {
			con.Remotes = append(con.Remotes[:j], con.Remotes[j+1:]...)

			if j > 0 {
				j = j - 1
			}
			continue
		}
		j++
	}

	if err := config.Write(con, configDir); err != nil {
		return err
	}

	return nil
}

func RemoveAll(configDir string) error {

	con, err := config.Read(configDir)
	if err != nil {
		return err
	}

	con.Remotes = nil

	if err := config.Write(con, configDir); err != nil {
		return err
	}

	return nil
}

func SendTemperature(temperature *stypes.Temperature, configDir string) error {

	con, err := config.Read(configDir)
	if err != nil {
		return err
	}

	var buffer bytes.Buffer
	temperature.EncodeToJSON(&buffer)

	for _, remote := range con.Remotes {
		requestURL := fmt.Sprintf("%s%s", remote.Address, "/temperatures")
		req, err := http.NewRequest("POST", requestURL, &buffer)
		if err != nil {
			return err
		}

		client := http.Client{}
		resp, err := client.Do(req)
		if err != nil {
			return err
		}
		defer resp.Body.Close()

		if resp.StatusCode < 200 || resp.StatusCode > 299 {
			b, err := ioutil.ReadAll(resp.Body)
			if err != nil {
				return fmt.Errorf("Invalid HTTP-Statuscode - expected 200, got %d - can not read response body: %v", resp.StatusCode, err)
			}
			return fmt.Errorf("Invalid HTTP-Statuscode - expected 200, got %d: %v", resp.StatusCode, string(b))
		}
	}

	return nil

}

// RegisterDevice ..
func RegisterDevice(configDir string, force bool) error {
	con, err := config.Read(configDir)
	if err != nil {
		return err
	}

	device := new(stypes.Device)
	device.DeviceID = con.DeviceID

	var buffer bytes.Buffer
	device.EncodeToJSON(&buffer)

	for _, remote := range con.Remotes {
		if !remote.Registered || force {
			requestURL := fmt.Sprintf("%s%s", remote.Address, "/devices")
			req, err := http.NewRequest("POST", requestURL, &buffer)
			if err != nil {
				return err
			}

			client := http.Client{}
			resp, err := client.Do(req)
			if err != nil {
				return err
			}
			defer resp.Body.Close()

			if resp.StatusCode < 200 || resp.StatusCode > 299 {
				b, err := ioutil.ReadAll(resp.Body)
				if err != nil {
					return fmt.Errorf("Invalid HTTP-Statuscode - expected 200, got %d - can not read response body: %v", resp.StatusCode, err)
				}
				return fmt.Errorf("Invalid HTTP-Statuscode - expected 200, got %d: %v", resp.StatusCode, string(b))
			}
			remote.Registered = true
		}
	}

	if err := config.Write(con, configDir); err != nil {
		return err
	}

	return nil
}

func UnregisterDevice(configDir string) error {

	return nil
}