package main

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

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

var (
	server string
	token  string
)

type ChangeLockReq struct {
	Locked bool `json:"locked"`
}

type ChangeAlertReq struct {
	Alert bool `json:"alert"`
	For   int  `json:"for"`
}

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 makeGetReq(url string) ([]byte, error) {
	req, err := http.NewRequest(http.MethodGet, 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
	}
	defer func() { res.Body.Close() }()

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

	return io.ReadAll(res.Body)
}

func makePostReq(url string, body any) ([]byte, error) {
	bodyRaw, err := json.Marshal(body)
	if err != nil {
		return nil, err
	}

	req, err := http.NewRequest(http.MethodPost, url, bytes.NewBuffer(bodyRaw))
	if err != nil {
		return nil, err
	}

	req.Header.Set("Authorization", token)
	req.Header.Set("Content-Type", "application/json")
	res, err := http.DefaultClient.Do(req)
	if err != nil {
		return nil, err
	}
	defer func() { _ = res.Body.Close() }()

	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 1.1.0")
					return nil
				},
			},
			{
				Name:   "test",
				Usage:  "test server connection",
				Action: test,
			},
			{
				Name:  "open",
				Usage: "get door state (opened or closed)",
				Flags: []cli.Flag{
					&cli.BoolFlag{
						Name:  "raw",
						Usage: "print raw server output",
					},
				},
				Action: getOpened,
			},
			{
				Name:  "lock",
				Usage: "change lock status",
				Commands: []*cli.Command{
					{
						Name:   "on",
						Usage:  "lock the door",
						Action: createManageLock(true),
					},
					{
						Name:   "off",
						Usage:  "unlock the door",
						Action: createManageLock(false),
					},
				},
				Action: getLocked,
			},
			{
				Name:  "alert",
				Usage: "change alert status",
				Commands: []*cli.Command{
					{
						Name:   "on",
						Usage:  "resume alerts",
						Action: createManageAlert(true),
					},
					{
						Name:  "off",
						Usage: "pause alerts",
						Flags: []cli.Flag{
							&cli.StringFlag{
								Name:  "for",
								Usage: "pause for x seconds",
							},
						},
						Action: createManageAlert(false),
					},
				},
				Action: getAlert,
			},
		},
	}

	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)
	data, err := makeGetReq(url)
	if err != nil {
		return err
	}

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

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

	opened, err := makeGetReq(fmt.Sprintf("%s/open", 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 getLocked(context.Context, *cli.Command) error {
	err := load()
	if err != nil {
		return err
	}

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

	alert, err := makeGetReq(fmt.Sprintf("%s/alert", 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 createManageLock(locked bool) func(context.Context, *cli.Command) error {
	return func(ctx context.Context, cmd *cli.Command) error {
		err := load()
		if err != nil {
			return err
		}

		var data ChangeLockReq
		data.Locked = locked

		_, err = makePostReq(fmt.Sprintf("%s/lock", server), data)
		if err != nil {
			return err
		}

		var action string
		if locked {
			action = "locked"
		} else {
			action = "unlocked"
		}

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

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

		var data ChangeAlertReq
		data.Alert = alert

		var secs int
		secsRaw := cmd.String("for")
		if secsRaw != "" {
			secs, err = strconv.Atoi(secsRaw)
			if err != nil {
				return err
			}
			data.For = secs
		}

		_, err = makePostReq(fmt.Sprintf("%s/alert", server), data)
		if err != nil {
			return err
		}

		var rest string
		if secsRaw != "" {
			rest = fmt.Sprintf(" for %d seconds", secs)
		}
		var action string
		if alert {
			action = "resumed"
		} else {
			action = "paused"
		}

		fmt.Printf("alerts were %sd%s\n", action, rest)
		return nil
	}
}