package cmd

import (
	"errors"
	"fmt"
	"github.com/urfave/cli/v2"
	"heckel.io/ntfy/v2/client"
	"heckel.io/ntfy/v2/log"
	"heckel.io/ntfy/v2/util"
	"io"
	"os"
	"os/exec"
	"path/filepath"
	"strings"
	"time"
)

func init() {
	commands = append(commands, cmdPublish)
}

var flagsPublish = append(
	append([]cli.Flag{}, flagsDefault...),
	&cli.StringFlag{Name: "config", Aliases: []string{"c"}, EnvVars: []string{"NTFY_CONFIG"}, Usage: "client config file"},
	&cli.StringFlag{Name: "title", Aliases: []string{"t"}, EnvVars: []string{"NTFY_TITLE"}, Usage: "message title"},
	&cli.StringFlag{Name: "message", Aliases: []string{"m"}, EnvVars: []string{"NTFY_MESSAGE"}, Usage: "message body"},
	&cli.StringFlag{Name: "priority", Aliases: []string{"p"}, EnvVars: []string{"NTFY_PRIORITY"}, Usage: "priority of the message (1=min, 2=low, 3=default, 4=high, 5=max)"},
	&cli.StringFlag{Name: "tags", Aliases: []string{"tag", "T"}, EnvVars: []string{"NTFY_TAGS"}, Usage: "comma separated list of tags and emojis"},
	&cli.StringFlag{Name: "delay", Aliases: []string{"at", "in", "D"}, EnvVars: []string{"NTFY_DELAY"}, Usage: "delay/schedule message"},
	&cli.StringFlag{Name: "click", Aliases: []string{"U"}, EnvVars: []string{"NTFY_CLICK"}, Usage: "URL to open when notification is clicked"},
	&cli.StringFlag{Name: "icon", Aliases: []string{"i"}, EnvVars: []string{"NTFY_ICON"}, Usage: "URL to use as notification icon"},
	&cli.StringFlag{Name: "actions", Aliases: []string{"A"}, EnvVars: []string{"NTFY_ACTIONS"}, Usage: "actions JSON array or simple definition"},
	&cli.StringFlag{Name: "attach", Aliases: []string{"a"}, EnvVars: []string{"NTFY_ATTACH"}, Usage: "URL to send as an external attachment"},
	&cli.BoolFlag{Name: "markdown", Aliases: []string{"md"}, EnvVars: []string{"NTFY_MARKDOWN"}, Usage: "Message is formatted as Markdown"},
	&cli.StringFlag{Name: "template", Aliases: []string{"tpl"}, EnvVars: []string{"NTFY_TEMPLATE"}, Usage: "use templates to transform JSON message body"},
	&cli.StringFlag{Name: "filename", Aliases: []string{"name", "n"}, EnvVars: []string{"NTFY_FILENAME"}, Usage: "filename for the attachment"},
	&cli.StringFlag{Name: "file", Aliases: []string{"f"}, EnvVars: []string{"NTFY_FILE"}, Usage: "file to upload as an attachment"},
	&cli.StringFlag{Name: "email", Aliases: []string{"mail", "e"}, EnvVars: []string{"NTFY_EMAIL"}, Usage: "also send to e-mail address"},
	&cli.StringFlag{Name: "user", Aliases: []string{"u"}, EnvVars: []string{"NTFY_USER"}, Usage: "username[:password] used to auth against the server"},
	&cli.StringFlag{Name: "token", Aliases: []string{"k"}, EnvVars: []string{"NTFY_TOKEN"}, Usage: "access token used to auth against the server"},
	&cli.IntFlag{Name: "wait-pid", Aliases: []string{"wait_pid", "pid"}, EnvVars: []string{"NTFY_WAIT_PID"}, Usage: "wait until PID exits before publishing"},
	&cli.BoolFlag{Name: "wait-cmd", Aliases: []string{"wait_cmd", "cmd", "done"}, EnvVars: []string{"NTFY_WAIT_CMD"}, Usage: "run command and wait until it finishes before publishing"},
	&cli.BoolFlag{Name: "no-cache", Aliases: []string{"no_cache", "C"}, EnvVars: []string{"NTFY_NO_CACHE"}, Usage: "do not cache message server-side"},
	&cli.BoolFlag{Name: "no-firebase", Aliases: []string{"no_firebase", "F"}, EnvVars: []string{"NTFY_NO_FIREBASE"}, Usage: "do not forward message to Firebase"},
	&cli.BoolFlag{Name: "quiet", Aliases: []string{"q"}, EnvVars: []string{"NTFY_QUIET"}, Usage: "do not print message"},
)

var cmdPublish = &cli.Command{
	Name:    "publish",
	Aliases: []string{"pub", "send", "trigger"},
	Usage:   "Send message via a ntfy server",
	UsageText: `ntfy publish [OPTIONS..] TOPIC [MESSAGE...]
ntfy publish [OPTIONS..] --wait-cmd COMMAND...
NTFY_TOPIC=.. ntfy publish [OPTIONS..] [MESSAGE...]`,
	Action:   execPublish,
	Category: categoryClient,
	Flags:    flagsPublish,
	Before:   initLogFunc,
	Description: `Publish a message to a ntfy server.

Examples:
  ntfy publish mytopic This is my message                 # Send simple message
  ntfy send myserver.com/mytopic "This is my message"     # Send message to different default host
  ntfy pub -p high backups "Backups failed"               # Send high priority message
  ntfy pub --tags=warning,skull backups "Backups failed"  # Add tags/emojis to message
  ntfy pub --delay=10s delayed_topic Laterzz              # Delay message by 10s
  ntfy pub --at=8:30am delayed_topic Laterzz              # Send message at 8:30am
  ntfy pub -e phil@example.com alerts 'App is down!'      # Also send email to phil@example.com
  ntfy pub --click="https://reddit.com" redd 'New msg'    # Opens Reddit when notification is clicked
  ntfy pub --icon="http://some.tld/icon.png" 'Icon!'      # Send notification with custom icon
  ntfy pub --attach="http://some.tld/file.zip" files      # Send ZIP archive from URL as attachment
  ntfy pub --file=flower.jpg flowers 'Nice!'              # Send image.jpg as attachment
  echo 'message' | ntfy publish mytopic                   # Send message from stdin
  ntfy pub -u phil:mypass secret Psst                     # Publish with username/password
  ntfy pub --wait-pid 1234 mytopic                        # Wait for process 1234 to exit before publishing
  ntfy pub --wait-cmd mytopic rsync -av ./ /tmp/a         # Run command and publish after it completes
  NTFY_USER=phil:mypass ntfy pub secret Psst              # Use env variables to set username/password
  NTFY_TOPIC=mytopic ntfy pub "some message"              # Use NTFY_TOPIC variable as topic 
  cat flower.jpg | ntfy pub --file=- flowers 'Nice!'      # Same as above, send image.jpg as attachment
  ntfy trigger mywebhook                                  # Sending without message, useful for webhooks
 
Please also check out the docs on publishing messages. Especially for the --tags and --delay options, 
it has incredibly useful information: https://ntfy.sh/docs/publish/.

` + clientCommandDescriptionSuffix,
}

func execPublish(c *cli.Context) error {
	conf, err := loadConfig(c)
	if err != nil {
		return err
	}
	title := c.String("title")
	priority := c.String("priority")
	tags := c.String("tags")
	delay := c.String("delay")
	click := c.String("click")
	icon := c.String("icon")
	actions := c.String("actions")
	attach := c.String("attach")
	markdown := c.Bool("markdown")
	template := c.String("template")
	filename := c.String("filename")
	file := c.String("file")
	email := c.String("email")
	user := c.String("user")
	token := c.String("token")
	noCache := c.Bool("no-cache")
	noFirebase := c.Bool("no-firebase")
	quiet := c.Bool("quiet")
	pid := c.Int("wait-pid")

	// Checks
	if user != "" && token != "" {
		return errors.New("cannot set both --user and --token")
	}

	// Do the things
	topic, message, command, err := parseTopicMessageCommand(c)
	if err != nil {
		return err
	}
	var options []client.PublishOption
	if title != "" {
		options = append(options, client.WithTitle(title))
	}
	if priority != "" {
		options = append(options, client.WithPriority(priority))
	}
	if tags != "" {
		options = append(options, client.WithTagsList(tags))
	}
	if delay != "" {
		options = append(options, client.WithDelay(delay))
	}
	if click != "" {
		options = append(options, client.WithClick(click))
	}
	if icon != "" {
		options = append(options, client.WithIcon(icon))
	}
	if actions != "" {
		options = append(options, client.WithActions(strings.ReplaceAll(actions, "\n", " ")))
	}
	if attach != "" {
		options = append(options, client.WithAttach(attach))
	}
	if markdown {
		options = append(options, client.WithMarkdown())
	}
	if template != "" {
		options = append(options, client.WithTemplate(template))
	}
	if filename != "" {
		options = append(options, client.WithFilename(filename))
	}
	if email != "" {
		options = append(options, client.WithEmail(email))
	}
	if noCache {
		options = append(options, client.WithNoCache())
	}
	if noFirebase {
		options = append(options, client.WithNoFirebase())
	}
	if token != "" {
		options = append(options, client.WithBearerAuth(token))
	} else if user != "" {
		var pass string
		parts := strings.SplitN(user, ":", 2)
		if len(parts) == 2 {
			user = parts[0]
			pass = parts[1]
		} else {
			fmt.Fprint(c.App.ErrWriter, "Enter Password: ")
			p, err := util.ReadPassword(c.App.Reader)
			if err != nil {
				return err
			}
			pass = string(p)
			fmt.Fprintf(c.App.ErrWriter, "\r%s\r", strings.Repeat(" ", 20))
		}
		options = append(options, client.WithBasicAuth(user, pass))
	} else if conf.DefaultToken != "" {
		options = append(options, client.WithBearerAuth(conf.DefaultToken))
	} else if conf.DefaultUser != "" && conf.DefaultPassword != nil {
		options = append(options, client.WithBasicAuth(conf.DefaultUser, *conf.DefaultPassword))
	}
	if pid > 0 {
		newMessage, err := waitForProcess(pid)
		if err != nil {
			return err
		} else if message == "" {
			message = newMessage
		}
	} else if len(command) > 0 {
		newMessage, err := runAndWaitForCommand(command)
		if err != nil {
			return err
		} else if message == "" {
			message = newMessage
		}
	}
	var body io.Reader
	if file == "" {
		body = strings.NewReader(message)
	} else {
		if message != "" {
			options = append(options, client.WithMessage(message))
		}
		if file == "-" {
			if filename == "" {
				options = append(options, client.WithFilename("stdin"))
			}
			body = c.App.Reader
		} else {
			if filename == "" {
				options = append(options, client.WithFilename(filepath.Base(file)))
			}
			body, err = os.Open(file)
			if err != nil {
				return err
			}
		}
	}
	cl := client.New(conf)
	m, err := cl.PublishReader(topic, body, options...)
	if err != nil {
		return err
	}
	if !quiet {
		fmt.Fprintln(c.App.Writer, strings.TrimSpace(m.Raw))
	}
	return nil
}

// parseTopicMessageCommand reads the topic and the remaining arguments from the context.

// There are a few cases to consider:
//
//	ntfy publish <topic> [<message>]
//	ntfy publish --wait-cmd <topic> <command>
//	NTFY_TOPIC=.. ntfy publish [<message>]
//	NTFY_TOPIC=.. ntfy publish --wait-cmd <command>
func parseTopicMessageCommand(c *cli.Context) (topic string, message string, command []string, err error) {
	var args []string
	topic, args, err = parseTopicAndArgs(c)
	if err != nil {
		return
	}
	if c.Bool("wait-cmd") {
		if len(args) == 0 {
			err = errors.New("must specify command when --wait-cmd is passed, type 'ntfy publish --help' for help")
			return
		}
		command = args
	} else {
		message = strings.Join(args, " ")
	}
	if c.String("message") != "" {
		message = c.String("message")
	}
	if message == "" && isStdinRedirected() {
		var data []byte
		data, err = io.ReadAll(io.LimitReader(c.App.Reader, 1024*1024))
		if err != nil {
			log.Debug("Failed to read from stdin: %s", err.Error())
			return
		}
		message = strings.TrimSpace(string(data))
	}
	return
}

func parseTopicAndArgs(c *cli.Context) (topic string, args []string, err error) {
	envTopic := os.Getenv("NTFY_TOPIC")
	if envTopic != "" {
		topic = envTopic
		return topic, remainingArgs(c, 0), nil
	}
	if c.NArg() < 1 {
		return "", nil, errors.New("must specify topic, type 'ntfy publish --help' for help")
	}
	return c.Args().Get(0), remainingArgs(c, 1), nil
}

func remainingArgs(c *cli.Context, fromIndex int) []string {
	if c.NArg() > fromIndex {
		return c.Args().Slice()[fromIndex:]
	}
	return []string{}
}

func waitForProcess(pid int) (message string, err error) {
	if !processExists(pid) {
		return "", fmt.Errorf("process with PID %d not running", pid)
	}
	start := time.Now()
	log.Debug("Waiting for process with PID %d to exit", pid)
	for processExists(pid) {
		time.Sleep(500 * time.Millisecond)
	}
	runtime := time.Since(start).Round(time.Millisecond)
	log.Debug("Process with PID %d exited after %s", pid, runtime)
	return fmt.Sprintf("Process with PID %d exited after %s", pid, runtime), nil
}

func runAndWaitForCommand(command []string) (message string, err error) {
	prettyCmd := util.QuoteCommand(command)
	log.Debug("Running command: %s", prettyCmd)
	start := time.Now()
	cmd := exec.Command(command[0], command[1:]...)
	if log.IsTrace() {
		cmd.Stdout = os.Stdout
		cmd.Stderr = os.Stderr
	}
	err = cmd.Run()
	runtime := time.Since(start).Round(time.Millisecond)
	if err != nil {
		if exitError, ok := err.(*exec.ExitError); ok {
			log.Debug("Command failed after %s (exit code %d): %s", runtime, exitError.ExitCode(), prettyCmd)
			return fmt.Sprintf("Command failed after %s (exit code %d): %s", runtime, exitError.ExitCode(), prettyCmd), nil
		}
		// Hard fail when command does not exist or could not be properly launched
		return "", fmt.Errorf("command failed: %s, error: %s", prettyCmd, err.Error())
	}
	log.Debug("Command succeeded after %s: %s", runtime, prettyCmd)
	return fmt.Sprintf("Command succeeded after %s: %s", runtime, prettyCmd), nil
}

func isStdinRedirected() bool {
	stat, err := os.Stdin.Stat()
	if err != nil {
		log.Debug("Failed to stat stdin: %s", err.Error())
		return false
	}
	return (stat.Mode() & os.ModeCharDevice) == 0
}
