// Jira attachments + Webex CC transcript conversion.
// Downloads happen via downloadClient (own retry policy); uploads use jiraClient.
import FormData from 'form-data';
import logger from '../../utilities/logger.js';
import { jiraClient, downloadClient } from './client.js';

/**
 * Shared helper: POST a Buffer as multipart attachment to the core Jira
 * attachments endpoint.
 *   - Uses jiraClient (correct base + auth).
 *   - Spreads form.getHeaders() so boundary is set.
 *   - Cleans any charset from Content-Type (prevents 415).
 *   - Retry loop only around the API call (download is caller's job).
 *   - Fail-fast on 401/403 (scope/perms).
 */
async function attachBufferToJira(jiraKey, fileBuffer, fileName) {
    for (let attempt = 1; attempt <= 3; attempt++) {
        try {
            const form = new FormData();
            form.append('file', fileBuffer, fileName);

            const formHeaders = form.getHeaders();
            if (formHeaders['content-type']) {
                formHeaders['content-type'] = formHeaders['content-type'].replace(/;\s*charset=[^;]*/i, '');
            }

            const uploadPath = `/rest/api/3/issue/${jiraKey}/attachments`;

            await jiraClient.post(uploadPath, form, {
                headers: {
                    'X-Atlassian-Token': 'no-check',
                    ...formHeaders
                },
                timeout: 15000
            });

            logger.info('File attached successfully', { jiraKey, fileName, attempt });
            return;
        } catch (err) {
            const status = err.response?.status;
            logger.error('Jira file attach attempt failed', {
                jiraKey,
                fileName,
                attempt,
                status,
                responseData: err.response?.data,
                responseHeaders: err.response?.headers ? Object.fromEntries(
                    Object.entries(err.response.headers).filter(([k]) => !k.toLowerCase().includes('auth'))
                ) : undefined
            });
            if (status === 401 || status === 403) {
                throw err;
            }
            if (attempt === 3) throw err;
            await new Promise(r => setTimeout(r, attempt * 1500));
        }
    }
}

/**
 * Download a file from the given URL (S3 pre-signed) *once* and attach using
 * the core Jira attachments API. Download happens outside the retry loop
 * because the signed URL expires (~1800s).
 */
export async function attachFileToJira(jiraKey, fileUrl, fileName) {
    let fileBuffer;
    try {
        const dl = await downloadClient.get(fileUrl, {
            responseType: 'arraybuffer'
        });
        fileBuffer = Buffer.from(dl.data);
    } catch (dlErr) {
        logger.error('Failed to download file from S3 for attachment (URL likely expired on replay)', {
            jiraKey,
            fileName,
            url: fileUrl,
            status: dlErr.response?.status,
            message: dlErr.message
        });
        throw dlErr;
    }

    await attachBufferToJira(jiraKey, fileBuffer, fileName);
}

/**
 * Convert a Webex-style JSON transcript to human-readable text.
 * Returns null if the shape isn't recognized.
 */
function formatTranscriptToHumanReadable(data) {
    if (!data || !Array.isArray(data.responseContents)) return null;
    const lines = [];
    lines.push(`Transcript`);
    if (data.interactionId) lines.push(`Interaction ID: ${data.interactionId}`);
    if (data.languageCode) lines.push(`Language: ${data.languageCode}`);
    lines.push('');
    for (const entry of data.responseContents) {
        const res = entry.recognitionResult;
        if (!res || !res.alternatives || !res.alternatives[0]) continue;
        const role = (res.role || 'UNKNOWN').toUpperCase();
        const alt = res.alternatives[0];
        const transcript = (alt.transcript || '').trim();
        if (!transcript) continue;
        let ts = '';
        const words = alt.words || [];
        if (words.length > 0) {
            const start = words[0].start_time || {};
            const totalSec = (start.seconds || 0) + Math.floor((start.nanos || 0) / 1e9);
            const min = Math.floor(totalSec / 60);
            const sec = Math.floor(totalSec % 60);
            ts = `[${String(min).padStart(2, '0')}:${String(sec).padStart(2, '0')}] `;
        }
        lines.push(`${ts}${role}: ${transcript}`);
    }
    return lines.join('\n');
}

async function fetchAndConvertTranscript(url) {
    try {
        const resp = await downloadClient.get(url, { timeout: 10000 });
        return formatTranscriptToHumanReadable(resp.data);
    } catch (e) {
        logger.warn(`Failed to fetch/convert transcript: ${e.message}`);
        return null;
    }
}

/**
 * Download the JSON transcript, convert to human-readable text, and attach as
 * `<base>-readable.txt`. Failures are swallowed so they don't mark the
 * original JSON attach as failed.
 */
export async function attachReadableTranscript(jiraKey, transcriptUrl, originalFileName = null) {
    const readable = await fetchAndConvertTranscript(transcriptUrl);
    if (!readable) {
        logger.warn('Readable transcript conversion yielded no content (check transcript JSON shape or URL)', { jiraKey });
        return false;
    }
    const base = (originalFileName || `transcript-${jiraKey}`).replace(/\.json$/i, '');
    const fileName = `${base}-readable.txt`;

    try {
        await attachBufferToJira(jiraKey, Buffer.from(readable, 'utf8'), fileName);
        return true;
    } catch (err) {
        logger.error('Readable transcript attach failed (non-fatal)', {
            jiraKey,
            fileName,
            error: err.response?.data?.message || err.message,
            status: err.response?.status
        });
        return false;
    }
}