const path = require("path");
const db = require(path.join(__dirname, "../models/guilds"));

/**
 * Checks and validates role reaction messages across all guilds
 * @param {Object} client - Discord client instance
 * @returns {Promise<void>}
 */
async function checkRoles(client) {
    try {
        // Find all guilds with role reactions
        const guildsWithRoles = await db.find({ 
            $expr: { $gt: [{ $size: "$roles" }, 0] } 
        });

        if (!guildsWithRoles?.length) return;

        // Process each guild sequentially to avoid rate limits
        for (const guild of guildsWithRoles) {
            try {
                await processGuildRoles(client, guild);
            } catch (error) {
                console.error(`Error processing guild ${guild.id}:`, error);
            }
        }
    } catch (error) {
        console.error('Error in checkRoles:', error);
    }
}

/**
 * Process role reactions for a single guild
 * @param {Object} client - Discord client instance
 * @param {Object} guild - Guild data from database
 * @returns {Promise<void>}
 */
async function processGuildRoles(client, guild) {
    const validRoles = [];
    const invalidRoles = [];

    // Process each role reaction message
    for (const role of guild.roles) {
        try {
            const channel = client.channels.get(role.chanId);
            
            // Skip if channel doesn't exist or role array is empty
            if (!channel || !role.roles?.length) {
                invalidRoles.push(role);
                continue;
            }

            // Verify message exists
            const message = await channel.fetchMessage(role.msgId).catch(() => null);
            if (message) {
                validRoles.push(role);
            } else {
                invalidRoles.push(role);
            }
        } catch (error) {
            console.error(`Error processing role ${role.msgId} in guild ${guild.id}:`, error);
            invalidRoles.push(role);
        }
    }

    // Update guild with only valid roles if there were any invalid ones
    if (invalidRoles.length > 0) {
        await client.database.updateGuild(guild.id, { 
            roles: validRoles 
        });
    }
}

module.exports = checkRoles;