package public

import (
	"strings"

	"velox-bot/internal/commands/fun/shared"
	"velox-bot/internal/diceexpr"

	"github.com/bwmarrin/discordgo"
)

var Dice = &discordgo.ApplicationCommand{
	Name:        "dice",
	Description: "Roll dice expressions (e.g. d20, 2d20+1, 2#d20+1)",
	Options: []*discordgo.ApplicationCommandOption{
		{
			Type:        discordgo.ApplicationCommandOptionString,
			Name:        "expr",
			Description: "Dice expression to roll",
			Required:    true,
		},
	},
	Contexts: &[]discordgo.InteractionContextType{
		discordgo.InteractionContextGuild,
		discordgo.InteractionContextBotDM,
		discordgo.InteractionContextPrivateChannel,
	},
}

func DiceHandler(s *discordgo.Session, i *discordgo.InteractionCreate) {
	expr := ""
	if opts := i.ApplicationCommandData().Options; len(opts) > 0 {
		expr = opts[0].StringValue()
	}
	expr = strings.TrimSpace(expr)
	if expr == "" {
		respondDiceFailure(s, i)
		return
	}

	res, err := diceexpr.EvalMany(expr, diceexpr.DefaultLimits())
	if err != nil {
		respondDiceFailure(s, i)
		return
	}

	out := diceexpr.FormatResult(res, diceexpr.DefaultFormatOptions())
	if len(out) > 1900 {
		// Keep within Discord message limits; trim safely.
		out = out[:1900] + "…"
	}
	shared.Respond(s, i, out)
}

func respondDiceFailure(s *discordgo.Session, i *discordgo.InteractionCreate) {
	if i.GuildID != "" {
		shared.RespondEphemeral(s, i, "Failure!")
		return
	}
	shared.Respond(s, i, "Failure!")
}