package main

import (
	"context"
	"crypto/tls"
	"errors"
	"fmt"
	"io"
	"log"
	"net/http"
	"os"
	"strconv"

	"github.com/spf13/viper"
	"github.com/urfave/cli/v3"
)

var (
	server string
	token  string
)

func load() error {
	viper.SetConfigName("config")
	viper.SetConfigType("toml")
	viper.AddConfigPath("$HOME/.local/share/door-alarm")
	err := viper.ReadInConfig()
	if err != nil {
		return err
	}

	server = viper.GetString("server")
	if server == "" {
		return errors.New("'server' property is required")
	}

	token = viper.GetString("token")
	if token == "" {
		return errors.New("'token' property is required")
	}

	return nil
}

func makeReqPrint(method string, url string) error {
	req, err := http.NewRequest(method, url, nil)
	if err != nil {
		return err
	}

	req.Header.Set("Authorization", token)
	res, err := http.DefaultClient.Do(req)
	if err != nil {
		return err
	}

	if res.StatusCode != 200 {
		fmt.Printf("<-- %d\n", res.StatusCode)
	}

	recv, err := io.ReadAll(res.Body)
	if err != nil {
		return err
	}

	fmt.Printf("%s", recv)
	return nil
}

func makeReqRet(method string, url string) ([]byte, error) {
	req, err := http.NewRequest(method, url, nil)
	if err != nil {
		return nil, err
	}

	req.Header.Set("Authorization", token)
	res, err := http.DefaultClient.Do(req)
	if err != nil {
		return nil, err
	}

	if res.StatusCode != 200 {
		fmt.Printf("<-- %d\n", res.StatusCode)
	}

	return io.ReadAll(res.Body)
}

func main() {
	http.DefaultTransport.(*http.Transport).TLSClientConfig = &tls.Config{InsecureSkipVerify: true}

	cmd := &cli.Command{
		Name:  "doorctl",
		Usage: "door-alarm server administration tool",
		Commands: []*cli.Command{
			{
				Name:  "version",
				Usage: "print version and exit",
				Action: func(context.Context, *cli.Command) error {
					fmt.Println("version 1.0.0")
					return nil
				},
			},
			{
				Name:   "test",
				Usage:  "test server connection",
				Action: test,
			},
			{
				Name:  "get",
				Usage: "get door state",
				Flags: []cli.Flag{
					&cli.BoolFlag{
						Name:  "raw",
						Usage: "print raw server output",
					},
				},
				Action: get,
			},
			{
				Name:  "lock",
				Usage: "change lock status",
				Commands: []*cli.Command{
					{
						Name:   "do",
						Usage:  "lock the door",
						Action: createManageLock(true),
					},
					{
						Name:   "undo",
						Usage:  "unlock the door",
						Action: createManageLock(false),
					},
				},
				Action: getLock,
			},
			{
				Name:  "alerts",
				Usage: "change alerts status",
				Commands: []*cli.Command{
					{
						Name:  "pause",
						Usage: "pause alerts",
						Flags: []cli.Flag{
							&cli.StringFlag{
								Name:  "for",
								Usage: "pause for x seconds",
							},
						},
						Action: createManageAlerts(true),
					},
					{
						Name:   "resume",
						Usage:  "resume alerts",
						Action: createManageAlerts(false),
					},
				},
				Action: getAlerts,
			},
		},
	}

	err := cmd.Run(context.Background(), os.Args)
	if err != nil {
		log.Fatal(err)
	}
}

func test(context.Context, *cli.Command) error {
	err := load()
	if err != nil {
		return err
	}

	url := fmt.Sprintf("%s/", server)
	return makeReqPrint(http.MethodGet, url)
}

func get(ctx context.Context, cmd *cli.Command) error {
	err := load()
	if err != nil {
		return err
	}

	opened, err := makeReqRet(http.MethodGet, fmt.Sprintf("%s/read", server))
	if err != nil {
		return err
	}

	if cmd.Bool("raw") {
		fmt.Println(opened)
	} else {
		if string(opened) == "true\n" {
			fmt.Println("door is open")
		} else {
			fmt.Println("door is closed")
		}
	}

	return nil
}

func getLock(context.Context, *cli.Command) error {
	err := load()
	if err != nil {
		return err
	}

	locked, err := makeReqRet(http.MethodGet, fmt.Sprintf("%s/lock", server))
	if err != nil {
		return err
	}

	if string(locked) == "true\n" {
		fmt.Println("door is locked")
	} else {
		fmt.Println("door is unlocked")
	}

	return nil
}

func createManageLock(do bool) func(context.Context, *cli.Command) error {
	return func(ctx context.Context, cmd *cli.Command) error {
		err := load()
		if err != nil {
			return err
		}

		var actionShort string
		var action string
		if do {
			actionShort = "do"
			action = "lock"
		} else {
			actionShort = "undo"
			action = "unlock"
		}

		_, err = makeReqRet(http.MethodPost, fmt.Sprintf("%s/lock/%s", server, actionShort))
		if err != nil {
			return err
		}

		fmt.Printf("door was %sed\n", action)
		return nil
	}
}

func getAlerts(context.Context, *cli.Command) error {
	err := load()
	if err != nil {
		return err
	}

	alert, err := makeReqRet(http.MethodGet, fmt.Sprintf("%s/alerts", server))
	if err != nil {
		return err
	}

	if string(alert) == "true\n" {
		fmt.Println("alerts are active")
	} else {
		fmt.Println("alerts are paused")
	}

	return nil
}

func createManageAlerts(pause bool) func(context.Context, *cli.Command) error {
	return func(ctx context.Context, cmd *cli.Command) error {
		err := load()
		if err != nil {
			return err
		}

		var action string
		if pause {
			action = "pause"
		} else {
			action = "resume"
		}

		var rest string
		var secs int
		secsRaw := cmd.String("for")
		if secsRaw != "" {
			secs, err = strconv.Atoi(secsRaw)
			if err != nil {
				return err
			}
			rest = fmt.Sprintf("?for=%d", secs)
		}

		_, err = makeReqRet(http.MethodPost, fmt.Sprintf("%s/alerts/%s%s", server, action, rest))
		if err != nil {
			return err
		}

		if secsRaw != "" {
			rest = fmt.Sprintf(" for %d seconds", secs)
		}
		fmt.Printf("alerts were %sd%s\n", action, rest)
		return nil
	}
}