import { createCommand } from "@shared/lib/utils";
import { SlashCommandBuilder, PermissionFlagsBits, MessageFlags, ComponentType } from "discord.js";
import { config } from "@/lib/config";
import { PruneService } from "@shared/modules/moderation/prune.service";
import {
    getConfirmationMessage,
    getProgressEmbed,
    getSuccessEmbed,
    getPruneErrorEmbed,
    getPruneWarningEmbed,
    getCancelledEmbed
} from "@/modules/moderation/prune.view";

export const prune = createCommand({
    data: new SlashCommandBuilder()
        .setName("prune")
        .setDescription("Delete messages in bulk (admin only)")
        .addIntegerOption(option =>
            option
                .setName("amount")
                .setDescription(`Number of messages to delete (1-${config.moderation?.prune?.maxAmount || 100})`)
                .setRequired(false)
                .setMinValue(1)
                .setMaxValue(config.moderation?.prune?.maxAmount || 100)
        )
        .addUserOption(option =>
            option
                .setName("user")
                .setDescription("Only delete messages from this user")
                .setRequired(false)
        )
        .addBooleanOption(option =>
            option
                .setName("all")
                .setDescription("Delete all messages in the channel")
                .setRequired(false)
        )
        .setDefaultMemberPermissions(PermissionFlagsBits.Administrator),

    execute: async (interaction) => {
        await interaction.deferReply({ flags: MessageFlags.Ephemeral });

        try {
            const amount = interaction.options.getInteger("amount");
            const user = interaction.options.getUser("user");
            const all = interaction.options.getBoolean("all") || false;

            // Validate inputs
            if (!amount && !all) {
                // Default to 10 messages
            } else if (amount && all) {
                await interaction.editReply({
                    embeds: [getPruneErrorEmbed("Cannot specify both `amount` and `all`. Please use one or the other.")]
                });
                return;
            }

            const finalAmount = all ? 'all' : (amount || 10);
            const confirmThreshold = config.moderation.prune.confirmThreshold;

            // Check if confirmation is needed
            const needsConfirmation = all || (typeof finalAmount === 'number' && finalAmount > confirmThreshold);

            if (needsConfirmation) {
                // Estimate message count for confirmation
                let estimatedCount: number | undefined;
                if (all) {
                    try {
                        estimatedCount = await PruneService.estimateMessageCount(interaction.channel!);
                    } catch {
                        estimatedCount = undefined;
                    }
                }

                const { embeds, components } = getConfirmationMessage(finalAmount, estimatedCount);
                const response = await interaction.editReply({ embeds, components });

                try {
                    const confirmation = await response.awaitMessageComponent({
                        filter: (i) => i.user.id === interaction.user.id,
                        componentType: ComponentType.Button,
                        time: 30000
                    });

                    if (confirmation.customId === "cancel_prune") {
                        await confirmation.update({
                            embeds: [getCancelledEmbed()],
                            components: []
                        });
                        return;
                    }

                    // User confirmed, proceed with deletion
                    await confirmation.update({
                        embeds: [getProgressEmbed({ current: 0, total: estimatedCount || finalAmount as number })],
                        components: []
                    });

                    // Execute deletion with progress callback for 'all' mode
                    const result = await PruneService.deleteMessages(
                        interaction.channel!,
                        {
                            amount: typeof finalAmount === 'number' ? finalAmount : undefined,
                            userId: user?.id,
                            all
                        },
                        all ? async (progress) => {
                            await interaction.editReply({
                                embeds: [getProgressEmbed(progress)]
                            });
                        } : undefined
                    );

                    // Show success
                    await interaction.editReply({
                        embeds: [getSuccessEmbed(result)],
                        components: []
                    });

                } catch (error) {
                    if (error instanceof Error && error.message.includes("time")) {
                        await interaction.editReply({
                            embeds: [getPruneWarningEmbed("Confirmation timed out. Please try again.")],
                            components: []
                        });
                    } else {
                        throw error;
                    }
                }
            } else {
                // No confirmation needed, proceed directly
                const result = await PruneService.deleteMessages(
                    interaction.channel!,
                    {
                        amount: finalAmount as number,
                        userId: user?.id,
                        all: false
                    }
                );

                // Check if no messages were found
                if (result.deletedCount === 0) {
                    if (user) {
                        await interaction.editReply({
                            embeds: [getPruneWarningEmbed(`No messages found from **${user.username}** in the last ${finalAmount} messages.`)]
                        });
                    } else {
                        await interaction.editReply({
                            embeds: [getPruneWarningEmbed("No messages found to delete.")]
                        });
                    }
                    return;
                }

                await interaction.editReply({
                    embeds: [getSuccessEmbed(result)]
                });
            }

        } catch (error) {
            console.error("Prune command error:", error);

            let errorMessage = "An unexpected error occurred while trying to delete messages.";
            if (error instanceof Error) {
                if (error.message.includes("permission")) {
                    errorMessage = "I don't have permission to delete messages in this channel.";
                } else if (error.message.includes("channel type")) {
                    errorMessage = "This command cannot be used in this type of channel.";
                } else {
                    errorMessage = error.message;
                }
            }

            await interaction.editReply({
                embeds: [getPruneErrorEmbed(errorMessage)]
            });
        }
    }
});