package public

import (
	"context"
	"fmt"
	"strconv"
	"strings"
	"unicode/utf8"

	"velox-bot/internal/db/repos/ticketrepo"

	"github.com/bwmarrin/discordgo"
)

// The rest of the ticket configuration: the on/off switch, the panel's text,
// the open ticket limit, editing a category, and looking at tickets. All of it
// is available from Discord, so a dashboard is never needed.

func ticketSettingsOptions() []*discordgo.ApplicationCommandOption {
	lo, hi := 1.0, 10.0
	return []*discordgo.ApplicationCommandOption{
		{
			Type: discordgo.ApplicationCommandOptionSubCommand, Name: "settings",
			Description: "Show the ticket settings, or change them. Leave out what you don't change",
			Options: []*discordgo.ApplicationCommandOption{
				{Type: discordgo.ApplicationCommandOptionBoolean, Name: "enabled", Description: "Turn tickets on or off"},
				{Type: discordgo.ApplicationCommandOptionString, Name: "panel-title", Description: "The panel's title", MaxLength: 256},
				{Type: discordgo.ApplicationCommandOptionString, Name: "panel-description", Description: "The panel's text", MaxLength: 4000},
				{Type: discordgo.ApplicationCommandOptionInteger, Name: "max-open", Description: "Open tickets one member can have, 1 to 10", MinValue: &lo, MaxValue: hi},
			},
		},
		{
			Type: discordgo.ApplicationCommandOptionSubCommand, Name: "list",
			Description: "List recent tickets",
			Options: []*discordgo.ApplicationCommandOption{
				{
					Type: discordgo.ApplicationCommandOptionString, Name: "status", Description: "Open or closed (default: open)",
					Choices: []*discordgo.ApplicationCommandOptionChoice{{Name: "open", Value: ticketrepo.StatusOpen}, {Name: "closed", Value: ticketrepo.StatusClosed}},
				},
			},
		},
	}
}

func categoryEditOption() *discordgo.ApplicationCommandOption {
	return &discordgo.ApplicationCommandOption{
		Type: discordgo.ApplicationCommandOptionSubCommand, Name: "edit",
		Description: "Change a category. Leave out what you don't change",
		Options: []*discordgo.ApplicationCommandOption{
			{Type: discordgo.ApplicationCommandOptionString, Name: "name", Description: "The category to change", Required: true},
			{Type: discordgo.ApplicationCommandOptionString, Name: "new-name", Description: "A new name", MaxLength: 40},
			{Type: discordgo.ApplicationCommandOptionRole, Name: "staff-role", Description: "Who handles these tickets"},
			{Type: discordgo.ApplicationCommandOptionBoolean, Name: "clear-staff-role", Description: "Remove the staff role"},
			{Type: discordgo.ApplicationCommandOptionString, Name: "emoji", Description: "Shown on the button. Use - to remove", MaxLength: 64},
			{Type: discordgo.ApplicationCommandOptionString, Name: "description", Description: "Shown on the panel. Use - to remove", MaxLength: 200},
		},
	}
}

func onOff(b bool) string {
	if b {
		return "on"
	}
	return "off"
}

func handleSettings(s *discordgo.Session, i *discordgo.InteractionCreate, o []*discordgo.ApplicationCommandInteractionDataOption) {
	ctx, cancel := context.WithTimeout(context.Background(), opTimeout)
	defer cancel()
	args := opts(o)
	g := guildID(i)

	if len(args) == 0 {
		st, err := Repo.GetSettings(ctx, g)
		if err != nil {
			reply(s, i, message("settings", err))
			return
		}
		where := "not set (use `/tickets setup`)"
		if st.ChannelID != 0 {
			where = fmt.Sprintf("<#%d>", st.ChannelID)
		}
		logs := "none"
		if st.LogChannelID != 0 {
			logs = fmt.Sprintf("<#%d>", st.LogChannelID)
		}
		reply(s, i, fmt.Sprintf("**Tickets:** %s\n**Channel:** %s · **Log channel:** %s\n**Open tickets per member:** %d\n**Panel title:** %s\n**Panel text:** %s",
			onOff(st.Enabled), where, logs, st.MaxOpenPerUser, clipText(st.PanelTitle, 200), clipText(st.PanelDescription, 600)))
		return
	}

	var p ticketrepo.SettingsPatch
	if a, ok := args["enabled"]; ok {
		v := a.BoolValue()
		p.Enabled = &v
	}
	if a, ok := args["panel-title"]; ok {
		v := strings.TrimSpace(a.StringValue())
		if v == "" || utf8.RuneCountInString(v) > 256 {
			reply(s, i, "The panel title must be between 1 and 256 characters.")
			return
		}
		p.PanelTitle = &v
	}
	if a, ok := args["panel-description"]; ok {
		v := strings.TrimSpace(a.StringValue())
		if utf8.RuneCountInString(v) > 4000 {
			reply(s, i, "The panel text can be at most 4000 characters.")
			return
		}
		p.PanelDescription = &v
	}
	if a, ok := args["max-open"]; ok {
		v := int(a.IntValue())
		if v < 1 || v > 10 {
			reply(s, i, "Open tickets per member must be between 1 and 10.")
			return
		}
		p.MaxOpenPerUser = &v
	}
	if err := Repo.UpdateSettings(ctx, g, p); err != nil {
		reply(s, i, message("settings", err))
		return
	}
	msg := "Saved."
	if p.PanelTitle != nil || p.PanelDescription != nil {
		msg += " Run `/tickets panel` to update the panel with the new text."
	}
	if p.Enabled != nil {
		msg += " Tickets are now **" + onOff(*p.Enabled) + "**."
	}
	reply(s, i, msg)
}

func clipText(s string, n int) string {
	if r := []rune(s); len(r) > n {
		return string(r[:n-1]) + "…"
	}
	return s
}

func handleCategoryEdit(s *discordgo.Session, i *discordgo.InteractionCreate, o []*discordgo.ApplicationCommandInteractionDataOption) {
	ctx, cancel := context.WithTimeout(context.Background(), opTimeout)
	defer cancel()
	args := opts(o)
	g := guildID(i)
	name := strings.TrimSpace(args["name"].StringValue())

	cats, err := Repo.ListCategories(ctx, g)
	if err != nil {
		reply(s, i, message("category edit", err))
		return
	}
	var target *ticketrepo.Category
	for idx := range cats {
		if strings.EqualFold(cats[idx].Name, name) {
			target = &cats[idx]
		}
	}
	if target == nil {
		reply(s, i, fmt.Sprintf("There's no category called **%s**.", name))
		return
	}

	var p ticketrepo.CategoryPatch
	if a, ok := args["new-name"]; ok {
		v := strings.TrimSpace(a.StringValue())
		if v == "" || utf8.RuneCountInString(v) > 40 {
			reply(s, i, "The category name must be between 1 and 40 characters.")
			return
		}
		for _, c := range cats {
			if c.ID != target.ID && strings.EqualFold(c.Name, v) {
				reply(s, i, fmt.Sprintf("There's already a category called **%s**.", c.Name))
				return
			}
		}
		p.Name = &v
	}
	if a, ok := args["staff-role"]; ok {
		id, _ := strconv.ParseInt(a.RoleValue(nil, i.GuildID).ID, 10, 64)
		p.StaffRoleID = &id
	}
	if a, ok := args["clear-staff-role"]; ok && a.BoolValue() {
		if p.StaffRoleID != nil {
			reply(s, i, "Choose either a staff role or clearing it, not both.")
			return
		}
		zero := int64(0)
		p.StaffRoleID = &zero
	}
	if a, ok := args["emoji"]; ok {
		v := strings.TrimSpace(a.StringValue())
		if v == "-" {
			v = ""
		}
		p.Emoji = &v
	}
	if a, ok := args["description"]; ok {
		v := strings.TrimSpace(a.StringValue())
		if v == "-" {
			v = ""
		}
		if utf8.RuneCountInString(v) > 200 {
			reply(s, i, "The category description can be at most 200 characters.")
			return
		}
		p.Description = &v
	}
	if p == (ticketrepo.CategoryPatch{}) {
		reply(s, i, "Say what to change: new-name, staff-role, clear-staff-role, emoji or description.")
		return
	}
	if _, err := Repo.UpdateCategory(ctx, g, target.ID, p); err != nil {
		reply(s, i, message("category edit", err))
		return
	}
	reply(s, i, fmt.Sprintf("Updated **%s**. Run `/tickets panel` to update the panel.", target.Name))
}

func handleList(s *discordgo.Session, i *discordgo.InteractionCreate, o []*discordgo.ApplicationCommandInteractionDataOption) {
	ctx, cancel := context.WithTimeout(context.Background(), opTimeout)
	defer cancel()
	status := ticketrepo.StatusOpen
	if a, ok := opts(o)["status"]; ok {
		status = a.StringValue()
	}
	ts, err := Repo.ListTickets(ctx, guildID(i), status, 15)
	if err != nil {
		reply(s, i, message("list", err))
		return
	}
	if len(ts) == 0 {
		reply(s, i, "No "+status+" tickets.")
		return
	}
	var b strings.Builder
	fmt.Fprintf(&b, "**Latest %s tickets**\n", status)
	for _, t := range ts {
		fmt.Fprintf(&b, "• #%d <#%d> %s, by <@%d>", t.Number, t.ThreadID, clipText(t.CategoryName, 30), t.OpenerID)
		if t.ClaimedBy != 0 {
			fmt.Fprintf(&b, ", claimed by <@%d>", t.ClaimedBy)
		}
		b.WriteString("\n")
	}
	reply(s, i, clipText(b.String(), 1900))
}