const LF_CDN = "https://cdn.jsdelivr.net/npm/localforage@1.10.0/dist/localforage.min.js";
const THREADS_KEY = "threads_v1";
const TARGET_SUBSTRING = "openrouter.ai/api/v1/chat/completions";
const SAVE_BYTES_THRESHOLD = 6 * 1024;
const SAVE_TIME_THRESHOLD = 800;
const BROADCAST_THROTTLE_MS = 600;
const gid = () => Math.random().toString(36).slice(2, 9) + "-" + Date.now().toString(36);
const now = () => Date.now();
let localforageAvailable = false;
let lfLoadError = null;
try {
  importScripts(LF_CDN);
  if (self.localforage) {
    localforageAvailable = true;
    try {
      localforage.config({ name: "sw-localforage" });
    } catch (e) {
    }
  } else {
    lfLoadError = "localforage not present after importScripts";
  }
} catch (e) {
  lfLoadError = String(e && e.message ? e.message : e);
}
const state = {
  totalIntercepted: 0,
  activeStreams: {},
  // streamId -> meta
  lastStreamSummary: null,
  debugWrites: []
  // ids of test threads written by SW
};
async function safeReadThreads() {
  if (!localforageAvailable) throw new Error("localforage not available: " + lfLoadError);
  try {
    const v = await localforage.getItem(THREADS_KEY);
    return Array.isArray(v) ? v : [];
  } catch (err) {
    throw err;
  }
}
async function safeWriteThreads(arr) {
  if (!localforageAvailable) throw new Error("localforage not available: " + lfLoadError);
  try {
    await localforage.setItem(THREADS_KEY, arr);
  } catch (err) {
    throw err;
  }
}
function pickLastThread(threads) {
  if (!threads || threads.length === 0) return null;
  const copy = [...threads].sort((a, b) => (b.updatedAt || 0) - (a.updatedAt || 0));
  return copy[0] || null;
}
function upsertAssistantInThreadObj(threadObj, streamId, text) {
  threadObj.updatedAt = now();
  for (let i = threadObj.messages.length - 1; i >= 0; i--) {
    const m = threadObj.messages[i];
    if (m && m.sw_streamId === streamId) {
      m.content = text;
      m.contentParts = [{ type: "text", text }];
      m.updatedAt = now();
      m._sw_savedAt = now();
      return threadObj;
    }
  }
  const msg = {
    id: "swmsg-" + gid(),
    role: "assistant",
    content: text,
    contentParts: [{ type: "text", text }],
    kind: "assistant",
    sw_saved: true,
    sw_streamId: streamId,
    createdAt: now(),
    updatedAt: now(),
    _sw_savedAt: now()
  };
  threadObj.messages.push(msg);
  return threadObj;
}
async function broadcast(msg) {
  try {
    const cl = await self.clients.matchAll({ includeUncontrolled: true, type: "window" });
    for (const c of cl) {
      try {
        c.postMessage(msg);
      } catch (e) {
      }
    }
  } catch (e) {
  }
}
function logDebug(text) {
  console.log("[sw-debug]", text);
  broadcast({ type: "sw-debug-log", ts: now(), text: String(text) });
}
self.addEventListener("install", (ev) => {
  self.skipWaiting();
});
self.addEventListener("activate", (ev) => {
  ev.waitUntil(self.clients.claim());
});
self.addEventListener("fetch", (event) => {
  try {
    const url = String(event.request.url || "");
    if (!url.includes(TARGET_SUBSTRING)) return;
    event.respondWith((async () => {
      const upstream = await fetch(event.request);
      if (!upstream || !upstream.body) return upstream;
      const streamId = "sw-" + gid();
      const meta = { url, startedAt: now(), bytes: 0, status: "started" };
      state.totalIntercepted = (state.totalIntercepted || 0) + 1;
      state.activeStreams[streamId] = meta;
      broadcast({ type: "sw-intercept-start", streamId, meta });
      const [clientStream, swStream] = upstream.body.tee();
      const savePromise = (async () => {
        const reader = swStream.getReader();
        const decoder = new TextDecoder("utf-8");
        let accumulated = "";
        let sinceLastSaveBytes = 0;
        let lastSaveAt = 0;
        let lastBroadcastAt = 0;
        async function flushToLastThread(force = false) {
          try {
            const nowMs = now();
            if (!force && sinceLastSaveBytes < SAVE_BYTES_THRESHOLD && nowMs - lastSaveAt < SAVE_TIME_THRESHOLD) return;
            if (!localforageAvailable) {
              logDebug("flushToLastThread: localforage not available: " + lfLoadError);
              return;
            }
            const threads = await safeReadThreads();
            let thread = pickLastThread(threads);
            if (!thread) {
              thread = { id: "sw-thread-" + gid(), title: "Missed while backgrounded", pinned: false, updatedAt: nowMs, messages: [] };
              threads.unshift(thread);
              logDebug("flush: created fallback thread " + thread.id);
            }
            upsertAssistantInThreadObj(thread, streamId, accumulated);
            await safeWriteThreads(threads);
            sinceLastSaveBytes = 0;
            lastSaveAt = nowMs;
            const now2 = Date.now();
            if (now2 - lastBroadcastAt > BROADCAST_THROTTLE_MS) {
              lastBroadcastAt = now2;
              broadcast({ type: "sw-intercept-progress", streamId, meta: { bytes: meta.bytes, savedAt: lastSaveAt, snippet: accumulated.slice(-1024) } });
            }
          } catch (err) {
            logDebug("flushToLastThread error: " + (err && err.message ? err.message : String(err)));
          }
        }
        try {
          while (true) {
            const { value, done } = await reader.read();
            if (done) break;
            let chunkText = "";
            try {
              chunkText = decoder.decode(value, { stream: true });
            } catch (e) {
              try {
                chunkText = String(value);
              } catch (_) {
                chunkText = "";
              }
            }
            accumulated += chunkText;
            const bytes = value ? value.byteLength || 0 : chunkText.length;
            meta.bytes += bytes;
            meta.lastProgressAt = now();
            sinceLastSaveBytes += bytes;
            await flushToLastThread(false);
          }
          await flushToLastThread(true);
          meta.status = "finished";
          meta.endedAt = now();
          state.lastStreamSummary = { streamId, url: meta.url, startedAt: meta.startedAt, endedAt: meta.endedAt, totalBytes: meta.bytes };
          delete state.activeStreams[streamId];
          broadcast({ type: "sw-intercept-end", streamId, meta: { totalBytes: meta.bytes, endedAt: meta.endedAt } });
        } catch (err) {
          meta.status = "error";
          meta.error = String(err && err.message ? err.message : err);
          delete state.activeStreams[streamId];
          broadcast({ type: "sw-intercept-error", streamId, meta: { error: meta.error } });
          logDebug("savePromise error: " + meta.error);
        }
      })();
      event.waitUntil(savePromise);
      return new Response(clientStream, {
        status: upstream.status,
        statusText: upstream.statusText,
        headers: upstream.headers
      });
    })());
  } catch (err) {
    logDebug("fetch handler error: " + (err && err.message ? err.message : String(err)));
  }
});
self.addEventListener("message", (event) => {
  const data = event.data || {};
  try {
    if (data && data.type === "PING") {
      if (event.ports && event.ports[0]) {
        event.ports[0].postMessage({ type: "PONG", ts: now(), ok: true });
      } else if (event.source && typeof event.source.postMessage === "function") {
        try {
          event.source.postMessage({ type: "PONG", ts: now(), ok: true });
        } catch (e) {
        }
      } else {
        broadcast({ type: "PONG", ts: now(), ok: true });
      }
      return;
    }
    if (data && data.type === "PING_STATUS") {
      const reply = {
        type: "PONG_STATUS",
        ts: now(),
        totalIntercepted: state.totalIntercepted || 0,
        activeStreams: Object.entries(state.activeStreams).map(([id, m]) => ({ streamId: id, url: m.url, bytes: m.bytes, status: m.status, startedAt: m.startedAt })),
        lastStreamSummary: state.lastStreamSummary || null,
        lfAvailable: localforageAvailable,
        lfLoadError
      };
      if (event.ports && event.ports[0]) event.ports[0].postMessage(reply);
      else if (event.source && event.source.postMessage) event.source.postMessage(reply);
      else broadcast(reply);
      return;
    }
    if (data && data.type === "TEST_WRITE") {
      (async () => {
        if (!localforageAvailable) {
          const res = { type: "TEST_WRITE_RESULT", ok: false, error: "localforage not available: " + lfLoadError };
          if (event.ports && event.ports[0]) event.ports[0].postMessage(res);
          else event.source && event.source.postMessage ? event.source.postMessage(res) : broadcast(res);
          return;
        }
        try {
          const threads = await safeReadThreads();
          const tid = "sw-test-" + gid();
          const nowMs = now();
          const testThread = {
            id: tid,
            title: "SW test thread " + nowMs,
            pinned: false,
            updatedAt: nowMs,
            messages: [
              { id: "swtestmsg-" + gid(), role: "assistant", content: "sw test write @" + new Date(nowMs).toISOString(), contentParts: [{ type: "text", text: "sw test write @" + new Date(nowMs).toISOString() }], createdAt: nowMs, updatedAt: nowMs }
            ]
          };
          threads.unshift(testThread);
          await safeWriteThreads(threads);
          state.debugWrites = (state.debugWrites || []).concat(tid);
          const res = { type: "TEST_WRITE_RESULT", ok: true, tid, now: nowMs };
          if (event.ports && event.ports[0]) event.ports[0].postMessage(res);
          else event.source && event.source.postMessage ? event.source.postMessage(res) : broadcast(res);
          logDebug("TEST_WRITE created " + tid);
        } catch (err) {
          const res = { type: "TEST_WRITE_RESULT", ok: false, error: String(err && err.message ? err.message : err) };
          if (event.ports && event.ports[0]) event.ports[0].postMessage(res);
          else event.source && event.source.postMessage ? event.source.postMessage(res) : broadcast(res);
          logDebug("TEST_WRITE error: " + res.error);
        }
      })();
      return;
    }
    if (data && data.type === "CHECK_LF") {
      (async () => {
        if (!localforageAvailable) {
          const res = { type: "CHECK_LF_RESULT", ok: false, error: "localforage not available: " + lfLoadError };
          if (event.ports && event.ports[0]) event.ports[0].postMessage(res);
          else event.source && event.source.postMessage ? event.source.postMessage(res) : broadcast(res);
          return;
        }
        try {
          const threads = await safeReadThreads();
          const res = { type: "CHECK_LF_RESULT", ok: true, threadsCount: Array.isArray(threads) ? threads.length : 0, sample: threads && threads[0] ? threads[0] : null };
          if (event.ports && event.ports[0]) event.ports[0].postMessage(res);
          else event.source && event.source.postMessage ? event.source.postMessage(res) : broadcast(res);
          logDebug("CHECK_LF returned " + (Array.isArray(threads) ? threads.length : "?") + " threads");
        } catch (err) {
          const res = { type: "CHECK_LF_RESULT", ok: false, error: String(err && err.message ? err.message : err) };
          if (event.ports && event.ports[0]) event.ports[0].postMessage(res);
          else event.source && event.source.postMessage ? event.source.postMessage(res) : broadcast(res);
          logDebug("CHECK_LF error: " + res.error);
        }
      })();
      return;
    }
    if (data && data.type === "LIST_SW_SAVED") {
      (async () => {
        if (!localforageAvailable) {
          const res = { type: "LIST_SW_SAVED_RESULT", ok: false, error: "localforage not available: " + lfLoadError };
          if (event.ports && event.ports[0]) event.ports[0].postMessage(res);
          else event.source && event.source.postMessage ? event.source.postMessage(res) : broadcast(res);
          return;
        }
        try {
          const threads = await safeReadThreads();
          const found = [];
          for (const t of threads || []) {
            for (const m of t.messages || []) {
              if (m && m.sw_streamId) found.push({ threadId: t.id, threadTitle: t.title, messageId: m.id, sw_streamId: m.sw_streamId, snippet: (m.content || "").slice(0, 200), updatedAt: m.updatedAt });
            }
          }
          const res = { type: "LIST_SW_SAVED_RESULT", ok: true, found };
          if (event.ports && event.ports[0]) event.ports[0].postMessage(res);
          else event.source && event.source.postMessage ? event.source.postMessage(res) : broadcast(res);
          logDebug("LIST_SW_SAVED returned " + found.length + " messages");
        } catch (err) {
          const res = { type: "LIST_SW_SAVED_RESULT", ok: false, error: String(err && err.message ? err.message : err) };
          if (event.ports && event.ports[0]) event.ports[0].postMessage(res);
          else event.source && event.source.postMessage ? event.source.postMessage(res) : broadcast(res);
          logDebug("LIST_SW_SAVED error: " + res.error);
        }
      })();
      return;
    }
    if (data && data.type === "CLEAR_TESTS") {
      (async () => {
        if (!localforageAvailable) {
          const res = { type: "CLEAR_TESTS_RESULT", ok: false, error: "localforage not available: " + lfLoadError };
          if (event.ports && event.ports[0]) event.ports[0].postMessage(res);
          else broadcast(res);
          return;
        }
        try {
          const threads = await safeReadThreads();
          const before = threads.length;
          const cleaned = threads.filter((t) => !(t.id && (String(t.id).startsWith("sw-test-") || String(t.id).startsWith("sw-thread-") || state.debugWrites.includes(t.id))));
          await safeWriteThreads(cleaned);
          const removed = before - cleaned.length;
          state.debugWrites = [];
          const res = { type: "CLEAR_TESTS_RESULT", ok: true, removed };
          if (event.ports && event.ports[0]) event.ports[0].postMessage(res);
          else broadcast(res);
          logDebug("CLEAR_TESTS removed " + removed);
        } catch (err) {
          const res = { type: "CLEAR_TESTS_RESULT", ok: false, error: String(err && err.message ? err.message : err) };
          if (event.ports && event.ports[0]) event.ports[0].postMessage(res);
          else broadcast(res);
        }
      })();
      return;
    }
  } catch (err) {
    logDebug("message handler error: " + (err && err.message ? err.message : String(err)));
  }
});