package discord

import (
	"context"
	"fmt"
	"time"

	"gitea.dwysokinski.me/twhelp/dcbot/internal/domain"
	"github.com/bwmarrin/discordgo"
)

type groupCommand struct {
	svc    GroupService
	client TWHelpClient
}

func (c *groupCommand) name() string {
	return "group"
}

func (c *groupCommand) register(s *discordgo.Session) error {
	if err := c.create(s); err != nil {
		return err
	}

	s.AddHandler(c.handle)

	return nil
}

func (c *groupCommand) create(s *discordgo.Session) error {
	versionChoices, err := c.getVersionChoices()
	if err != nil {
		return err
	}

	var perm int64 = discordgo.PermissionAdministrator
	_, err = s.ApplicationCommandCreate(s.State.User.ID, "", &discordgo.ApplicationCommand{
		Name:                     c.name(),
		Description:              "Manages monitor groups on this server",
		DefaultMemberPermissions: &perm,
		Options: []*discordgo.ApplicationCommandOption{
			{
				Name:        "create",
				Description: "Creates a new monitor group",
				Type:        discordgo.ApplicationCommandOptionSubCommand,
				Options: []*discordgo.ApplicationCommandOption{
					{
						Name:        "version",
						Description: "e.g. www.tribalwars.net, www.plemiona.pl",
						Type:        discordgo.ApplicationCommandOptionString,
						Choices:     versionChoices,
						Required:    true,
					},
					{
						Name:        "server",
						Description: "Tribal Wars server (e.g. en115, pl170)",
						Type:        discordgo.ApplicationCommandOptionString,
						Required:    true,
					},
					{
						Name:        "channel-gained-villages",
						Description: "Specifies on which channel notifications of gained villages will appear",
						Type:        discordgo.ApplicationCommandOptionChannel,
						ChannelTypes: []discordgo.ChannelType{
							discordgo.ChannelTypeGuildText,
						},
						Required: false,
					},
					{
						Name:        "channel-lost-villages",
						Description: "Specifies on which channel notifications of lost villages will appear",
						Type:        discordgo.ApplicationCommandOptionChannel,
						ChannelTypes: []discordgo.ChannelType{
							discordgo.ChannelTypeGuildText,
						},
						Required: false,
					},
				},
			},
			{
				Name:        "list",
				Description: "Lists all created groups",
				Type:        discordgo.ApplicationCommandOptionSubCommand,
			},
			{
				Name:        "set-server",
				Description: "Sets a Tribal Wars server (e.g. en115, pl170) for a group",
				Type:        discordgo.ApplicationCommandOptionSubCommand,
				Options: []*discordgo.ApplicationCommandOption{
					{
						Name:        "group",
						Description: "Group ID",
						Type:        discordgo.ApplicationCommandOptionString,
						Required:    true,
					},
					{
						Name:        "version",
						Description: "e.g. www.tribalwars.net, www.plemiona.pl",
						Type:        discordgo.ApplicationCommandOptionString,
						Choices:     versionChoices,
						Required:    true,
					},
					{
						Name:        "server",
						Description: "Tribal Wars server (e.g. en115, pl170)",
						Type:        discordgo.ApplicationCommandOptionString,
						Required:    true,
					},
				},
			},
		},
	})
	if err != nil {
		return fmt.Errorf("s.ApplicationCommandCreate: %w", err)
	}
	return nil
}

func (c *groupCommand) getVersionChoices() ([]*discordgo.ApplicationCommandOptionChoice, error) {
	versions, err := c.client.ListVersions(context.Background())
	if err != nil {
		return nil, fmt.Errorf("TWHelpClient.ListVersions: %w", err)
	}

	versionChoices := make([]*discordgo.ApplicationCommandOptionChoice, 0, len(versions))
	for _, v := range versions {
		versionChoices = append(versionChoices, &discordgo.ApplicationCommandOptionChoice{
			Name:  v.Host,
			Value: v.Code,
		})
	}
	return versionChoices, nil
}

func (c *groupCommand) handle(s *discordgo.Session, i *discordgo.InteractionCreate) {
	cmdData := i.ApplicationCommandData()

	if cmdData.Name != c.name() {
		return
	}

	switch cmdData.Options[0].Name {
	case "create":
		c.handleCreate(s, i)
		return
	case "list":
		c.handleList(s, i)
		return
	case "set-server":
		c.handleSetServer(s, i)
		return
	default:
	}
}

func (c *groupCommand) handleCreate(s *discordgo.Session, i *discordgo.InteractionCreate) {
	ctx := context.Background()

	version := ""
	server := ""
	channelGainedVillages := ""
	channelLostVillages := ""
	for _, opt := range i.ApplicationCommandData().Options[0].Options {
		if opt == nil {
			continue
		}
		switch opt.Name {
		case "version":
			version = opt.StringValue()
		case "server":
			server = opt.StringValue()
		case "channel-gained-villages":
			channelGainedVillages = opt.ChannelValue(s).ID
		case "channel-lost-villages":
			channelLostVillages = opt.ChannelValue(s).ID
		}
	}

	params, err := domain.NewCreateGroupParams(
		i.GuildID,
		version,
		server,
		channelGainedVillages,
		channelLostVillages,
	)
	if err != nil {
		_ = s.InteractionRespond(i.Interaction, &discordgo.InteractionResponse{
			Type: discordgo.InteractionResponseChannelMessageWithSource,
			Data: &discordgo.InteractionResponseData{
				Content: messageFromError(err),
			},
		})
		return
	}

	group, err := c.svc.Create(ctx, params)
	if err != nil {
		_ = s.InteractionRespond(i.Interaction, &discordgo.InteractionResponse{
			Type: discordgo.InteractionResponseChannelMessageWithSource,
			Data: &discordgo.InteractionResponseData{
				Content: messageFromError(err),
			},
		})
		return
	}

	_ = s.InteractionRespond(i.Interaction, &discordgo.InteractionResponse{
		Type: discordgo.InteractionResponseChannelMessageWithSource,
		Data: &discordgo.InteractionResponseData{
			Content: "group has been successfully created (ID=" + group.ID + ")",
		},
	})
}

func (c *groupCommand) handleList(s *discordgo.Session, i *discordgo.InteractionCreate) {
	ctx := context.Background()

	groups, err := c.svc.List(ctx, domain.ListGroupsParams{
		ServerIDs: []string{i.GuildID},
	})
	if err != nil {
		_ = s.InteractionRespond(i.Interaction, &discordgo.InteractionResponse{
			Type: discordgo.InteractionResponseChannelMessageWithSource,
			Data: &discordgo.InteractionResponseData{
				Content: messageFromError(err),
			},
		})
		return
	}

	_ = s.InteractionRespond(i.Interaction, &discordgo.InteractionResponse{
		Type: discordgo.InteractionResponseChannelMessageWithSource,
		Data: &discordgo.InteractionResponseData{
			Embeds: []*discordgo.MessageEmbed{
				{
					Type:        discordgo.EmbedTypeRich,
					Title:       "Group list",
					Description: buildGroupListDescription(groups),
					Timestamp:   time.Now().Format(time.RFC3339),
				},
			},
		},
	})
}

func (c *groupCommand) handleSetServer(s *discordgo.Session, i *discordgo.InteractionCreate) {
	ctx := context.Background()

	group := ""
	version := ""
	server := ""
	for _, opt := range i.ApplicationCommandData().Options[0].Options {
		if opt == nil {
			continue
		}
		switch opt.Name {
		case "group":
			group = opt.StringValue()
		case "version":
			version = opt.StringValue()
		case "server":
			server = opt.StringValue()
		}
	}

	_, err := c.svc.SetTWServer(ctx, group, version, server)
	if err != nil {
		_ = s.InteractionRespond(i.Interaction, &discordgo.InteractionResponse{
			Type: discordgo.InteractionResponseChannelMessageWithSource,
			Data: &discordgo.InteractionResponseData{
				Content: messageFromError(err),
			},
		})
		return
	}

	_ = s.InteractionRespond(i.Interaction, &discordgo.InteractionResponse{
		Type: discordgo.InteractionResponseChannelMessageWithSource,
		Data: &discordgo.InteractionResponseData{
			Content: "group has been successfully updated",
		},
	})
}

func buildGroupListDescription(groups []domain.Group) string {
	description := "**ID** - **Version** - **Server**"
	for i, g := range groups {
		description += fmt.Sprintf("\n%d. %s - %s - %s", i+1, g.ID, g.VersionCode, g.ServerKey)
	}
	return description
}