package config

import (
	"crypto/ed25519"
	"encoding/hex"
	"fmt"
	"net"
	"strconv"
	"strings"
)

type MailIngress struct {
	ID             string   `json:"id"`
	Enabled        bool     `json:"enabled"`
	Address        string   `json:"address"`
	Username       string   `json:"username"`
	Password       string   `json:"password"`
	Folder         string   `json:"folder"`
	Channel        string   `json:"channel"`
	PollSeconds    int      `json:"poll_seconds"`
	From           []string `json:"from,omitempty"`
	To             []string `json:"to,omitempty"`
	ImportExisting bool     `json:"import_existing"`
}
type DiscordIngress struct {
	Enabled       bool     `json:"enabled"`
	PublicKey     string   `json:"public_key"`
	ApplicationID string   `json:"application_id"`
	GuildIDs      []string `json:"guild_ids"`
	ChannelIDs    []string `json:"channel_ids"`
	Command       string   `json:"command"`
}

func validateIngress(c IngressConfig) error {
	seen := map[string]bool{}
	for _, m := range c.Mail {
		if m.ID == "" || seen[m.ID] {
			return fmt.Errorf("Mail-Eingang benötigt eindeutige ID")
		}
		seen[m.ID] = true
		if !m.Enabled {
			continue
		}
		host, port, err := net.SplitHostPort(m.Address)
		p, _ := strconv.Atoi(port)
		if err != nil || host == "" || p < 1 || p > 65535 || m.Username == "" || m.Password == "" || m.Channel == "" {
			return fmt.Errorf("Mail-Eingang %q: Adresse (Host:Port), Benutzer, Passwort und Kanal erforderlich", m.ID)
		}
		if m.PollSeconds < 10 || m.PollSeconds > 86400 {
			return fmt.Errorf("Mail-Abfrageintervall muss 10..86400 Sekunden sein")
		}
	}
	d := c.Discord
	if d.Enabled {
		for _, id := range append(append([]string{}, d.GuildIDs...), d.ChannelIDs...) {
			if strings.TrimSpace(id) == "" {
				return fmt.Errorf("Discord-Allowlists dürfen keine leeren IDs enthalten")
			}
		}
		key, err := hex.DecodeString(d.PublicKey)
		if err != nil || len(key) != ed25519.PublicKeySize || d.ApplicationID == "" || d.Command == "" || len(d.GuildIDs) == 0 || len(d.ChannelIDs) == 0 {
			return fmt.Errorf("Discord benötigt Public Key, Application-ID, Command und Guild-/Channel-Allowlist")
		}
	}
	return nil
}