package discord

import (
	"fmt"
	"strings"

	"github.com/bwmarrin/discordgo"
)

func init() {
	commands = append(commands, &command{
		deleteInvocation: true,
		name:             "help",
		validate: func(cmd commandInit) bool {
			return true
		},
		run: func(cmd commandInit) (string, error) {
			args := strings.Fields(cmd.message.Content)[1:]

			var resp *discordgo.MessageEmbed
			if len(args) == 1 {
				resp = singleHelp(cmd, args[0])
			} else {
				resp = allHelp(cmd)
			}

			channel, err := cmd.session.UserChannelCreate(cmd.message.Author.ID)
			if err != nil {
				return "", err
			}

			sendEmbed(cmd.session, channel.ID, resp)
			return "", nil
		},
		help: "HELP! HEEEEEEEEEELP!",
	})
}

func singleHelp(cmd commandInit, arg string) *discordgo.MessageEmbed {
	embed := &discordgo.MessageEmbed{
		Title: "Unkown Command",
		Color: 0x007D96,
	}
	c, ok := commandMap[arg]
	if !ok {
		return embed
	}

	if c.staffOnly && !isStaff(cmd.message.Member.Roles, cmd.config.StaffRoles) {
		return embed
	}

	embed.Title = c.name
	embed.Description = c.help
	return embed
}

func allHelp(cmd commandInit) *discordgo.MessageEmbed {
	staff := isStaff(cmd.message.Member.Roles, cmd.config.StaffRoles)
	embed := &discordgo.MessageEmbed{
		Title:  "SedBot Help",
		Fields: make([]*discordgo.MessageEmbedField, 0),
	}
	if staff {
		embed.Description = "Commands with an asterisk (*) are staff-only"
	}
	for _, c := range commands {
		if c.child {
			continue
		}

		cmdName := c.name
		if len(c.aliases) > 0 {
			cmdName += fmt.Sprintf(" (%s)", strings.Join(c.aliases, ", "))
		}
		if c.staffOnly {
			cmdName = fmt.Sprintf("*%s", cmdName)
		}
		if !c.staffOnly || staff {
			embed.Fields = append(embed.Fields, &discordgo.MessageEmbedField{
				Name:   cmdName,
				Value:  c.help,
				Inline: true,
			})
		}
	}
	return embed
}