// The generic "standard function" pipeline, run once per source for a LIVE sync:
//   listChannels() → raw upstream records  → normalize(raw) → one SourceChannel doc each
//   → dedupe by deterministic _id (last wins, idempotent) → return docs for upsert.
//
// Ported from d-combine/lib/core/build-source.mjs, but returns the docs instead of writing files —
// the seed module upserts them into Mongo. The whole file is source-agnostic.
import { logger } from './logger.js';
export async function buildSource(adapter) {
    const startedAt = Date.now();
    logger.info('build', `[${adapter.id}] fetching channel listings…`);
    const { raw, meta = {} } = await adapter.listChannels();
    logger.info('build', `[${adapter.id}] got ${raw.length} raw records (${meta.live === false ? 'offline snapshot' : 'live'})`);
    const ingestedAt = new Date().toISOString();
    const normalized = [];
    for (const record of raw) {
        try {
            const doc = adapter.normalize(record, { ingestedAt });
            if (doc)
                normalized.push(doc);
        }
        catch (err) {
            logger.warn('build', `[${adapter.id}] skipped a record: ${err.message}`);
        }
    }
    // Dedupe by deterministic _id (last wins) — guards against duplicate upstream rows.
    const byId = new Map();
    for (const doc of normalized)
        byId.set(doc._id, doc);
    const docs = [...byId.values()];
    logger.ok('build', `[${adapter.id}] normalized ${docs.length} docs`);
    return {
        id: adapter.id,
        count: docs.length,
        docs,
        live: meta.live !== false,
        meta: { ...meta, buildMs: Date.now() - startedAt },
    };
}
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