/**
 * @node imap-fetch
 * @name IMAP Fetch Email
 * @category email
 * @version 1.2.0
 * @description Fetch the full content of an email from an IMAP server.
 * @icon download
 */

const configSchema = {
    type: 'object',
    properties: {
        credentialId: {
            type: 'string',
            title: 'IMAP Credential',
            description: 'Select the IMAP credential to use for authentication',
            dynamicOptions: {
                source: 'credentials',
                filter: { type: 'imap' }
            }
        },
        mailbox: {
            type: 'string',
            title: 'Mailbox',
            description: 'The mailbox containing the email',
            default: 'INBOX'
        },
        uid: {
            type: 'string',
            title: 'Email UID',
            description: 'The unique identifier of the email to fetch (can be provided from input)'
        },
        peek: {
            type: 'boolean',
            title: 'Peek (Don\'t Mark as Read)',
            description: 'Fetch without marking the email as read',
            default: true
        }
    },
    required: ['credentialId']
};

const inputSchema = {
    type: 'object',
    properties: {
        uid: {
            type: 'string',
            description: 'Email UID to fetch'
        },
        mailbox: {
            type: 'string',
            description: 'Override mailbox from input'
        }
    }
};

const outputSchema = {
    type: 'object',
    properties: {
        uid: { type: 'string', description: 'Unique email identifier' },
        subject: { type: 'string', description: 'Decoded - RFC 2047 encoded words are resolved by the IMAP client' },
        from: { type: 'string', description: 'Decoded, in "Name <address>" form' },
        to: { type: 'string', description: 'Decoded, in "Name <address>" form' },
        cc: { type: 'string', description: 'Decoded, in "Name <address>" form. Empty when the message carries no Cc' },
        date: { type: 'string' },
        body: { type: 'string', description: 'Email body text' },
        raw: { type: 'string', description: 'Raw email content (for attachment extraction)' },
        hasAttachments: { type: 'boolean', description: 'Whether email has attachments' },
        mailbox: { type: 'string' }
    }
};

const outputs = [
    { name: 'main', displayName: 'Email Content', type: 'object', color: '#8b5cf6' }
];

/**
 * Check if email has attachments by looking for Content-Disposition: attachment
 * or multipart content types
 */
function detectAttachments(rawEmail) {
    if (!rawEmail) return false;
    const lower = rawEmail.toLowerCase();
    return lower.includes('content-disposition: attachment') ||
           lower.includes('content-disposition:attachment') ||
           (lower.includes('multipart/mixed') && lower.includes('boundary='));
}

module.exports = {
    configSchema,
    inputSchema,
    outputSchema,
    outputs,

    async execute(config, input, context) {
        const credentialId = config.credentialId;
        const mailbox = input.mailbox || config.mailbox || 'INBOX';
        const uid = input.uid || config.uid;
        const peek = config.peek !== false;  // Default to true (don't mark as read)

        if (!credentialId) {
            throw new Error('IMAP credential is required');
        }

        if (!uid) {
            throw new Error('Email UID is required');
        }

        // Fetch the email
        const fetchResult = smartbotic.imap.fetch({
            credentialId,
            mailbox,
            uid,
            peek
        });

        if (!fetchResult.success) {
            throw new Error(`IMAP fetch failed: ${fetchResult.error}`);
        }

        // Spread, not a field-by-field copy. Listing them by name is how cc
        // went missing the day it was added to the fetch result: the C++ side
        // set it, this dropped it, and nothing failed. `success` is removed
        // because it belongs to the call, not to the email.
        const { success, ...email } = fetchResult;
        return {
            ...email,
            hasAttachments: detectAttachments(fetchResult.raw),
            mailbox
        };
    }
};