import { briefWeekKey } from './brief-outbox.mjs';
import { splitBriefText } from './brief-content.mjs';

/** Delivery accounting shared by scheduled and administrator-triggered briefs. */
export function createBriefSender({ store, buildBrief, text, html, telegramConfigured, sendTelegram, emailConfigured, sendEmail, outbox, clock = () => new Date(), warn = console.warn }) {
  return async function sendBrief(tenderGetir) {
    const tenders = await tenderGetir();
    const r = { kullanici:0, gonderilen:0, bos:0, hata:0, kapali:0, kanalsiz:0, atlanan:0, bekleyen:0,
      kanallar:{ telegram:{denenen:0,kabul:0,hata:0}, email:{denenen:0,kabul:0,hata:0} } };
    for (const user of store.listUsers()) {
      r.kullanici++;
      let accepted = false, failed = false;
      try {
        // Manual runs must also honor the recipient's opt-out.
        if (store.getData(user.email, 'brief')?.kapali) { r.kapali++; continue; }
        const brief = buildBrief(user.email, tenders);
        if (brief.bos) { r.bos++; continue; }
        const channels = [];
        const telegram = store.getData(user.email, 'telegram');
        if (telegramConfigured() && telegram?.chatId) {
          for (const part of splitBriefText(text(brief))) channels.push({
            payload:{channel:'telegram',chatId:telegram.chatId,text:part},
            name:'telegram', send:() => sendTelegram(telegram.chatId, part, { parseMode:null }),
            valid:receipt => receipt === true,
          });
        }
        if (emailConfigured()) channels.push({
          payload:{channel:'email',to:user.email,subject:`İhaleist — Haftalık Brief (${brief.hafta})`,html:html(brief),text:text(brief)},
          name:'email', send:() => sendEmail({ to:user.email, subject:`İhaleist — Haftalık Brief (${brief.hafta})`, html:html(brief), text:text(brief) }),
          valid:receipt => typeof receipt?.id === 'string' && Boolean(receipt.id.trim()),
        });
        if (!channels.length) { r.kanalsiz++; continue; }
        const batch = outbox?.prepare(briefWeekKey(clock()),user.email,channels.map(channel=>channel.payload));
        if (batch?.changed) { r.bekleyen++; r.hata++; continue; }
        const failedChannels = new Set();
        for (const [position,channel] of channels.entries()) {
          if (failedChannels.has(channel.name)) continue;
          // An earlier channel can await the network while the user disables briefs.
          if (store.getData(user.email, 'brief')?.kapali) { r.kapali++; break; }
          const claim = outbox?.claim(batch.id,position,clock().getTime());
          if (claim?.state === 'accepted') { r.atlanan++; continue; }
          if (claim && claim.state !== 'sending') {
            r.bekleyen++; failedChannels.add(channel.name);
            if (claim.state === 'uncertain') failed=true;
            continue;
          }
          const counts = r.kanallar[channel.name];
          counts.denenen++;
          try {
            const receipt = await channel.send();
            if (!channel.valid(receipt)) throw new Error('Sağlayıcı gönderimi doğrulamadı.');
            if (claim) outbox.accept(claim,receipt === true ? 'telegram-accepted' : receipt.id);
            counts.kabul++;
            accepted = true;
          } catch (error) {
            if (claim) outbox.hold(claim,error);
            counts.hata++;
            failedChannels.add(channel.name);
            failed = true;
            warn('[brief]', user.email, channel.name, error.message);
          }
        }
      } catch (error) {
        failed = true;
        warn('[brief]', user.email, error.message);
      }
      if (accepted) r.gonderilen++;
      if (failed) r.hata++;
    }
    return r;
  };
}