package server

import (
	"fmt"
	"io"
	"regexp"
	"strings"

	"go.neonxp.ru/qchat/internal/chat"
)

var replacements = []replacement{
	{
		From: *regexp.MustCompile(`\*(.+?)\*`),
		To:   fmt.Sprintf("%s$1%s", escapeCodes[Bold], escapeCodes[Reset]),
	},
	{
		From: *regexp.MustCompile(`_(.+?)_`),
		To:   fmt.Sprintf("%s$1%s", escapeCodes[Italic], escapeCodes[Reset]),
	},
}

func displayMessage(t io.Writer, message chat.Message, user *chat.User) {
	msg := message.Message
	mentionFrom := "@" + user.Username
	mentionTo := string(escapeCodes[Blink]) + string(escapeCodes[Underline]) + "@" + user.Username + string(escapeCodes[Reset])
	if strings.Contains(msg, mentionFrom) {
		msg = strings.ReplaceAll(msg, mentionFrom, mentionTo)
		msg = "\x07\a" + msg
	}

	for _, r := range replacements {
		msg = r.From.ReplaceAllString(msg, r.To)
	}

	fmt.Fprintf(t, "%s%15s%s [%s]%s: %s\n",
		escapeCodes[Blue],
		message.User.NUsername(),
		escapeCodes[Green],
		message.Time.Format("15:04:05"),
		escapeCodes[Reset],
		msg,
	)
}

func displaySystemMessage(t io.Writer, message chat.SystemMessage) {
	fmt.Fprintf(t, "%s* %s %s\n",
		escapeCodes[Green],
		message.Message,
		escapeCodes[Reset],
	)
}
func displaySelfMessage(t io.Writer, message chat.SelfMessage) {
	fmt.Fprintf(t, "%s* %s %s%s\n",
		escapeCodes[Blue],
		message.User.NUsername(),
		message.Message,
		escapeCodes[Reset],
	)
}

func displayUserJoined(t io.Writer, presence chat.UserJoined) {
	fmt.Fprintf(t, "%s* %s joined to %s chan%s\n",
		escapeCodes[Green],
		presence.User.NUsername(),
		presence.Chan.Name,
		escapeCodes[Reset],
	)
}

func displayUserLeft(t io.Writer, presence chat.UserLeft) {
	fmt.Fprintf(t, "%s* %s left %s chan%s\n",
		escapeCodes[Red],
		presence.User.NUsername(),
		presence.Chan.Name,
		escapeCodes[Reset],
	)
}

type replacement struct {
	From regexp.Regexp
	To   string
}