import {
    SlashCommandBuilder,
    CommandInteraction,
    AutocompleteInteraction,
    EmbedBuilder, MessageFlags, ChatInputCommandInteraction, time
} from "discord.js";
import {AutocompleteCommand, ChatInteractionCommand, Command} from "./Command";
import {Container} from "../../Container/Container";
import {GroupSelection} from "../CommandPartials/GroupSelection";
import {UserError} from "../UserError";
import {PlaydateModel} from "../../Models/PlaydateModel";
import {PlaydateRepository} from "../../Repositories/PlaydateRepository";
import {GroupModel} from "../../Models/GroupModel";

export class PlaydatesCommand implements Command, AutocompleteCommand, ChatInteractionCommand {
    static REGEX = [
        
    ]
    
    definition(): SlashCommandBuilder {
        // @ts-expect-error Command builder is improperly marked as incomplete.
        return new SlashCommandBuilder()
            .setName("playdates")
            .setDescription("Manage your playdates")
            .addSubcommand((subcommand) => subcommand
                .setName("create")
                .setDescription("Creates a new playdate")
                .addIntegerOption(GroupSelection.createOptionSetup())
                .addStringOption((option) => option
                    .setName("from")
                    .setDescription("Defines the start date & time. Format: YYYY-MM-DD HH:mm")
                )
                .addStringOption((option) => option
                    .setName("to")
                    .setDescription("Defines the end date & time. Format: YYYY-MM-DD HH:mm")
                )
            )
            .addSubcommand((subcommand) => subcommand
                .setName("list")
                .setDescription("Lists all playdates")
                .addIntegerOption(GroupSelection.createOptionSetup())
            )
            .addSubcommand((subcommand) => subcommand
                .setName("remove")
                .setDescription("Removes a playdate")
                .addIntegerOption(GroupSelection.createOptionSetup())
                .addIntegerOption((option) => option
                    .setName("playdate")
                    .setDescription("Selects a playdate")
                    .setRequired(true)
                    .setAutocomplete(true)
                )
            );
    }
    
    async execute(interaction: ChatInputCommandInteraction): Promise<void> {
        const group = GroupSelection.getGroup(interaction);
        
        switch (interaction.options.getSubcommand()) {
            case "create":
                await this.create(interaction, group);
                break;
            case "remove":
                await this.delete(interaction, group);
                break;
            case "list":
                await this.list(interaction, group);
                break;
            default:
                throw new UserError("This subcommand is not yet implemented.");
        }
    }
    
    async create(interaction: CommandInteraction, group: GroupModel): Promise<void> {
        const fromDate = Date.parse(<string>interaction.options.get("from")?.value ?? '');
        const toDate = Date.parse(<string>interaction.options.get("to")?.value ?? '');

        if (isNaN(fromDate)) {
            throw new UserError("No date or invalid date format for the from parameter.");
        }

        if (isNaN(toDate)) {
            throw new UserError("No date or invalid date format for the to parameter.");
        }

        if (fromDate > toDate) {
            throw new UserError("The to-date can't be earlier than the from-date");
        }
        
        const playdateRepo = Container.get<PlaydateRepository>(PlaydateRepository.name);
        
        const collidingTimes = playdateRepo.findPlaydatesInRange(fromDate, toDate, group);
        if (collidingTimes.length > 0) {
            throw new UserError("The playdate collides with another playdate. Please either remove the old one or choose a different time.")
        }
        
        const playdate: Partial<PlaydateModel> = {
            group: group,
            from_time: new Date(fromDate),
            to_time: new Date(toDate),
        }

        playdateRepo.create(playdate);

        const embed = new EmbedBuilder()
            .setTitle("Created a play-date.")
            .setDescription(":white_check_mark: Your playdate has been created! You and your group get notified, when its time.")
            .setFields({
                name: "Created playdate",
                value: `${time(new Date(fromDate),'F')} - ${time(new Date(toDate), 'F')}`,
            })
            .setFooter({
                text: `Group: ${group.name}`
            })

        await interaction.reply({
            embeds: [
                embed
            ],
            flags: MessageFlags.Ephemeral,
        })
    }
    
    async handleAutocomplete(interaction: AutocompleteInteraction): Promise<void> {
        const option = interaction.options.getFocused(true);
        if (option.name == "group") {
            await GroupSelection.handleAutocomplete(interaction);
            return;
        }

        if (option.name != 'playdate') {
            return;
        }

        const group = GroupSelection.getGroup(interaction);
        
        const playdates = Container.get<PlaydateRepository>(PlaydateRepository.name).findFromGroup(group);
        await interaction.respond(
            playdates.map(playdate => {
                return {
                    name: `${playdate.from_time.toLocaleString()} - ${playdate.to_time.toLocaleString()}`,
                    value: playdate.id
                }
            })
        )
    }

    private async list(interaction: ChatInputCommandInteraction, group: GroupModel) {
        const playdates = Container.get<PlaydateRepository>(PlaydateRepository.name).findFromGroup(group);

        const embed = new EmbedBuilder()
            .setTitle("The next playdates:")
            .setFields(
                playdates.map((playdate) =>
                {
                    return {
                        name: `${time(playdate.from_time, 'F')} - ${time(playdate.to_time, 'F')}`,
                        value: `${time(playdate.from_time, 'R')}`
                    }
                })
            )
            .setFooter({
                text: `Group: ${group.name}`
            })
        
        await interaction.reply({
            embeds: [
                embed
            ],
            flags: MessageFlags.Ephemeral,
        })
    }
    
    private async delete(interaction: ChatInputCommandInteraction, group: GroupModel): Promise<void> {
        const playdateId = interaction.options.getInteger("playdate", true)
        
        const repo = Container.get<PlaydateRepository>(PlaydateRepository.name);
        const selected = repo.getById(playdateId);
        if (!selected) {
            throw new UserError("No playdate found");
        }
        
        if (selected.group?.id != group.id) {
            throw new UserError("No playdate found");
        }
        
        repo.delete(playdateId);

        const embed = new EmbedBuilder()
            .setTitle("Playdate deleted")
            .setDescription(
                `:x: Deleted \`${selected.from_time.toLocaleString()} - ${selected.to_time.toLocaleString()}\``
            )
            .setFooter({
                text: `Group: ${group.name}`
            })

        await interaction.reply({
            embeds: [
                embed
            ],
            flags: MessageFlags.Ephemeral,
        })
    }
}