package main

import (
	"context"
	"encoding/json"
	"fmt"
	"io"
	"os"
	"slices"
	"strings"
	"wazuh-notify/common"
	"wazuh-notify/config"
	"wazuh-notify/constants"
	"wazuh-notify/discord"
	logger "wazuh-notify/log"
	"wazuh-notify/ntfy"
	"wazuh-notify/slack"

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

func Notify() *cli.Command {
	return &cli.Command{
		Name:      "notify",
		Usage:     "notify services about security event",
		Action:    action,
		Flags:     flags(),
		ArgsUsage: "args usage",
	}
}

func flags() []cli.Flag {
	return []cli.Flag{
		&cli.StringFlag{
			Name:        constants.Source,
			Aliases:     []string{"s"},
			Usage:       "The file path to read from. Defaults to **standard in** if not set.",
			Value:       "",
			DefaultText: "stdin",
		},
		&cli.StringFlag{
			Name:        constants.Click,
			Usage:       "is a link (URL) that can be followed by tapping/clicking inside the message. (Overrides TOML config)",
			Value:       "",
			DefaultText: "Defined in config",
		},
		&cli.StringFlag{
			Name:  constants.Sender,
			Usage: "is the sender of the message, either an app name or a person. (Overrides TOML config)",
			Value: "Wazuh (IDS) Golang",
		},
		&cli.StringSliceFlag{
			Name:        constants.Targets,
			Aliases:     []string{"t"},
			Usage:       "is a comma-separated list of targets (slack, ntfy, discord) to send notifications to. (Overrides TOML config)",
			Value:       []string{},
			DefaultText: "Defined in config",
		},
	}
}

func action(context context.Context, c *cli.Command) error {
	sourcePath := c.String(constants.Source)
	var input io.Reader

	if sourcePath == "" {
		fmt.Println("Reading from standard input (stdin)...")
		input = os.Stdin
	} else {
		file, err := common.ReadFile(sourcePath)
		if err != nil {
			return err
		}
		defer file.Close()
		input = file
	}

	ar, err := readInput(input)
	if err != nil {
		return err
	}

	var color int
	var priority int
	var mention string = ""

	for i := range config.File.PriorityMaps {
		if slices.Contains(config.File.PriorityMaps[i].ThreatMap, ar.Parameters.Alert.Rule.Level) {
			//Check notify threshold
			if ar.Parameters.Alert.Rule.FiredTimes%config.File.PriorityMaps[i].NotifyThreshold != 0 {
				logger.Log("threshold not met")
				return nil
			}
			//Set color based on config map
			color = config.File.PriorityMaps[i].Color
			//Check mention threshold
			if ar.Parameters.Alert.Rule.FiredTimes >= config.File.PriorityMaps[i].MentionThreshold {
				mention = constants.DiscordMention
			}
			break
		}
	}

	targets := c.StringSlice(constants.Targets)
	if len(targets) == 0 {
		targets = strings.Split(config.File.General.Targets, ",")
	}

	if c.String(constants.Click) != "" {
		config.File.General.Click = c.String(constants.Click)
	}

	// Ignored out messages based on config
	if common.Ignored(ar) {
		return nil
	}

	logger.Log("Finished processing message. sending to enabled targets.")

	if slices.Contains(targets, constants.Discord) {
		logger.Log("Discord targets found.")
		discord.Send(ar, color, mention, priority)
	}
	if slices.Contains(targets, constants.Ntfy) {
		logger.Log("Ntfy targets found.")
		ntfy.Send(ar, priority)
	}
	if slices.Contains(targets, constants.Slack) {
		logger.Log("Slack targets found.")
		slack.Send(ar, priority)
	}
	return nil
}

func readInput(input io.Reader) (common.ActiveResponse, error) {
	var ar common.ActiveResponse

	decoder := json.NewDecoder(input)

	err := decoder.Decode(&ar)
	if err != nil {
		fmt.Fprintf(os.Stderr, "Error decoding JSON from stdin: %v\n", err)
		return ar, err
	}

	return ar, nil
}