import BotCommand from "../../libs/BotCommand";
import BotClient from "../../libs/BotClient";
import { ChatInputCommandInteraction, MessageFlags, EmbedBuilder, PermissionFlagsBits } from "discord.js";
import Team from "../../models/Team";
import User from "../../models/User";
import Database from "../../libs/Database";
import PointsManager from "../../libs/PointsManager";

export default class TeamManageCommand extends BotCommand {
    constructor() {
        super("team", "Create, edit, or delete teams (Admin only)", "/team");
        
        this.data.addSubcommand(subcommand =>
            subcommand.setName("create")
                .setDescription("Create a new team")
                .addStringOption(option =>
                    option.setName("name")
                        .setDescription("Team name")
                        .setRequired(true))
                .addUserOption(option =>
                    option.setName("leader")
                        .setDescription("Team leader")
                        .setRequired(true))
                .addRoleOption(option =>
                    option.setName("role")
                        .setDescription("Team role to assign to members")
                        .setRequired(true))
                .addStringOption(option =>
                    option.setName("description")
                        .setDescription("Team description")
                        .setRequired(false))
        );

        this.data.addSubcommand(subcommand =>
            subcommand.setName("delete")
                .setDescription("Delete a team")
                .addStringOption(option =>
                    option.setName("name")
                        .setDescription("Team name")
                        .setRequired(true))
        );

        this.data.addSubcommand(subcommand =>
            subcommand.setName("change-leader")
                .setDescription("Change team leader")
                .addStringOption(option =>
                    option.setName("name")
                        .setDescription("Team name")
                        .setRequired(true))
                .addUserOption(option =>
                    option.setName("new-leader")
                        .setDescription("New team leader")
                        .setRequired(true))
        );

        this.data.addSubcommand(subcommand =>
            subcommand.setName("list")
                .setDescription("List all teams")
        );

        this.data.addSubcommand(subcommand =>
            subcommand.setName("change-user-team")
                .setDescription("Change a user's team (only during first week of month)")
                .addUserOption(option =>
                    option.setName("user")
                        .setDescription("User to move")
                        .setRequired(true))
                .addStringOption(option =>
                    option.setName("team")
                        .setDescription("Team name")
                        .setRequired(true))
        );

        this.data.setDefaultMemberPermissions(PermissionFlagsBits.ManageGuild);
    }

    override async execute(Discord: any, client: BotClient, interaction: ChatInputCommandInteraction): Promise<any> {
        const db = Database.getInstance();
        if (!db.isConnected()) {
            return interaction.reply({ content: "❌ Database not connected. Points system unavailable.", flags: MessageFlags.Ephemeral });
        }

        const subcommand = interaction.options.getSubcommand();

        try {
            if (subcommand === "create") {
                const name = interaction.options.getString("name", true);
                const leader = interaction.options.getUser("leader", true);
                const role = interaction.options.getRole("role", true);
                const description = interaction.options.getString("description") || "";

                const existing = await Team.findOne({ name });
                if (existing) {
                    return interaction.reply({ content: `❌ Team **${name}** already exists.`, flags: MessageFlags.Ephemeral });
                }

                const team = new Team({
                    name,
                    leaderId: leader.id,
                    roleId: role.id,
                    description,
                    points: 0,
                    memberCount: 0
                });
                await team.save();

                const embed = new EmbedBuilder()
                    .setTitle("✅ Team Created")
                    .setColor(0x22c55e)
                    .addFields(
                        { name: "Team Name", value: name, inline: true },
                        { name: "Leader", value: `<@${leader.id}>`, inline: true },
                        { name: "Role", value: `<@&${role.id}>`, inline: true },
                        { name: "Description", value: description || "None", inline: false }
                    )
                    .setTimestamp();

                return interaction.reply({ embeds: [embed] });

            } else if (subcommand === "delete") {
                const name = interaction.options.getString("name", true);
                const team = await Team.findOne({ name });

                if (!team) {
                    return interaction.reply({ content: `❌ Team **${name}** not found.`, flags: MessageFlags.Ephemeral });
                }

                // Remove role from all team members
                const teamMembers = await User.find({ teamId: team._id });
                const guild = interaction.guild;
                if (guild) {
                    for (const user of teamMembers) {
                        try {
                            const member = await guild.members.fetch(user.userId);
                            if (member && member.roles.cache.has(team.roleId)) {
                                await member.roles.remove(team.roleId);
                            }
                        } catch (err) {
                            console.error(`Failed to remove role from ${user.userId}:`, err);
                        }
                    }
                }

                await User.updateMany({ teamId: team._id }, { $set: { teamId: null } });
                await Team.deleteOne({ _id: team._id });

                return interaction.reply({ content: `✅ Team **${name}** has been deleted and roles removed from members.`, flags: MessageFlags.Ephemeral });

            } else if (subcommand === "change-leader") {
                const name = interaction.options.getString("name", true);
                const newLeader = interaction.options.getUser("new-leader", true);
                const team = await Team.findOne({ name });

                if (!team) {
                    return interaction.reply({ content: `❌ Team **${name}** not found.`, flags: MessageFlags.Ephemeral });
                }

                team.leaderId = newLeader.id;
                await team.save();

                return interaction.reply({ content: `✅ Team **${name}** leader changed to <@${newLeader.id}>.`, flags: MessageFlags.Ephemeral });

            } else if (subcommand === "list") {
                const teams = await Team.find().sort({ points: -1 }).exec();

                if (teams.length === 0) {
                    return interaction.reply({ content: "No teams exist yet.", flags: MessageFlags.Ephemeral });
                }

                const embed = new EmbedBuilder()
                    .setTitle("📋 All Teams")
                    .setColor(0x60a5fa)
                    .setDescription(teams.map((t: any, i: number) => 
                        `**${i + 1}.** ${t.name} - Leader: <@${t.leaderId}> - Role: <@&${t.roleId}>\n` +
                        `   Members: ${t.memberCount} | Points: ${t.points} (Adjusted: ${t.adjustedPoints})`
                    ).join("\n\n"))
                    .setTimestamp();

                return interaction.reply({ embeds: [embed] });

            } else if (subcommand === "change-user-team") {
                const user = interaction.options.getUser("user", true);
                const teamName = interaction.options.getString("team", true);
                const team = await Team.findOne({ name: teamName });

                if (!team) {
                    return interaction.reply({ content: `❌ Team **${teamName}** not found.`, flags: MessageFlags.Ephemeral });
                }

                const result = await PointsManager.joinTeam(user.id, user.username, team._id.toString(), true, interaction.guild || undefined);

                if (result.success) {
                    return interaction.reply({ content: `✅ <@${user.id}> has been moved to team **${teamName}**.`, flags: MessageFlags.Ephemeral });
                } else {
                    return interaction.reply({ content: `❌ ${result.message}`, flags: MessageFlags.Ephemeral });
                }
            }

        } catch (error) {
            console.error("Error in team-manage command:", error);
            return interaction.reply({ content: "❌ An error occurred.", flags: MessageFlags.Ephemeral });
        }
    }
}