#!/usr/bin/env python3
"""Usage telemetry for Mem0 agent plugins.

Events are linked to your Mem0 account email when an API key is configured, and
to a random per-machine id otherwise. Not anonymous — the Python SDK and CLI
attribute the same way.

Hooks run on a 3-6 second budget and fire on every tool call, so recording never
touches the network: `record` appends one JSON line to a local spool and returns.
A detached `python3 telemetry.py` drains the spool in one batched PostHog request,
started once per session and again from the flush worker that is already detached.

Pure stdlib, matching the rest of the plugin. Opt out with MEM0_TELEMETRY=false.

Never sends prompts, memory text, queries, file paths, repository names, or API
keys: only event names, durations, counts, coarse outcomes, and repo/session
identifiers hashed with a random per-install salt.
"""

from __future__ import annotations

import hashlib
import json
import os
import platform
import subprocess
import sys
import time
import urllib.error
import urllib.request
import uuid
from pathlib import Path
from typing import Any

import memory_core

# Seeded from the per-host module the build generates into core/. Two processes
# in this pipeline never call init() — mcp_server.py, and the detached
# `python3 telemetry.py` sender that spawn_flush() starts — so a module default
# was what every one of their events got labelled with.
try:  # pragma: no cover - absent only in the un-built shared source tree
    from _harness_id import HARNESS_ID as _DEFAULT_HARNESS
    from _harness_id import PLATFORM_APPLICATION as _PLATFORM_APPLICATION
    from _harness_id import PLATFORM_SOURCE as _PLATFORM_SOURCE
    from _harness_id import SOURCE_TAG as _DEFAULT_SOURCE_TAG
except ImportError:
    _DEFAULT_HARNESS = "generic"
    _DEFAULT_SOURCE_TAG = "MEM0_PLUGIN"
    _PLATFORM_SOURCE = "MEM0_PLUGIN"
    _PLATFORM_APPLICATION = ""

_harness: str = _DEFAULT_HARNESS
_source_tag: str = _DEFAULT_SOURCE_TAG
_PRIVATE_KEYS = {
    "apikey",
    "authorization",
    "password",
    "query",
    "secret",
    "prompt",
    "token",
    "text",
    "memory",
    "message",
    "error",
    "path",
    "cwd",
    "userid",
    "agentid",
    "runid",
    "repoid",
    "repositoryid",
    "projectid",
    "appid",
    "filters",
}


def init(harness: str = "", source_tag: str = "") -> None:
    """Override the generated identity. Optional — core/_harness_id.py is the default.

    The fallback shape matches memory_core.configure_harness's (``<HOST>_PLUGIN``).
    It used to be ``MEM0_<HOST>_PLUGIN`` here and ``<host>_plugin`` there, which
    meant one plugin could emit three different source values depending on which
    process happened to send the batch.
    """
    global _harness, _source_tag
    _harness = harness or _DEFAULT_HARNESS
    _source_tag = source_tag or (
        f"{_harness.upper().replace('-', '_')}_PLUGIN" if harness else _DEFAULT_SOURCE_TAG
    )

POSTHOG_API_KEY = "phc_hgJkUVJFYtmaJqrvf6CYN67TIQ8yhXAkWzUn9AMU4yX"
POSTHOG_CAPTURE_URL = "https://us.i.posthog.com/i/v0/e/"
POSTHOG_BATCH_URL = "https://us.i.posthog.com/batch/"
EVENT_PREFIX = "code"
SPOOL_LIMIT_BYTES = 256 * 1024
BATCH_SIZE = 100
SEND_TIMEOUT = 5
CLAIM_STALE_SECONDS = 120
CLAIM_EXPIRY_SECONDS = 7 * 24 * 60 * 60
# A batch is only discarded once it has genuinely been retried this many times.
MAX_CLAIM_ATTEMPTS = 3
# Parked claims drained per run, after the live spool. Bounded so a long backlog
# cannot turn one flush into an unbounded send loop.
MAX_PARKED_PER_RUN = 3


def is_enabled() -> bool:
    """Whether telemetry is switched on for this process."""
    return os.environ.get("MEM0_TELEMETRY", "true").strip().lower() not in {
        "false",
        "0",
        "no",
        "off",
    }


def _digest(value: str, length: int = 16) -> str:
    """Unsalted digest. Only for values that are already secrets (API keys)."""
    return hashlib.sha256(value.encode("utf-8")).hexdigest()[:length]


def _install_salt() -> str:
    """Random per-install salt, created on first use and kept in the identity file."""
    identity = _read_identity()
    salt = identity.get("salt")
    if not salt:
        salt = uuid.uuid4().hex
        identity["salt"] = salt
        _write_identity(identity)
    return salt


def _scoped_digest(value: str, length: int = 16) -> str:
    """Salted digest for values drawn from a guessable space.

    repo.identity is a git remote URL, or ``local:<absolute path>`` when there is
    no remote — which normally contains the account username. Sixteen unsalted
    hex characters over that input space is enumerable, so this is not a
    privacy control without the salt. Salting per install keeps every
    within-account join the analytics actually use and gives up only
    cross-machine joins on the same repository, which nothing computes.
    """
    if not value:
        return ""
    return hashlib.sha256(f"{_install_salt()}:{value}".encode("utf-8")).hexdigest()[:length]


def _safe_value(value: Any) -> Any:
    if isinstance(value, str):
        return memory_core.redact(value)
    if isinstance(value, dict):
        return {
            key: _safe_value(item)
            for key, item in value.items()
            if "".join(character for character in str(key).lower() if character.isalnum())
            not in _PRIVATE_KEYS
        }
    if isinstance(value, (list, tuple)):
        return [_safe_value(item) for item in value]
    if value is None or isinstance(value, (bool, int, float)):
        return value
    return memory_core.redact(value)


def _spool_path() -> Path:
    return memory_core.data_dir() / "telemetry.jsonl"


def _identity_path() -> Path:
    return memory_core.data_dir() / "telemetry-identity.json"


def _read_identity() -> dict[str, str]:
    try:
        value = json.loads(_identity_path().read_text(encoding="utf-8"))
    except (OSError, json.JSONDecodeError):
        return {}
    return value if isinstance(value, dict) else {}


def _write_identity(identity: dict[str, str]) -> None:
    path = _identity_path()
    temporary = path.with_suffix(f".{os.getpid()}.tmp")
    try:
        path.parent.mkdir(parents=True, exist_ok=True)
        temporary.write_text(json.dumps(identity), encoding="utf-8")
        temporary.replace(path)
    except OSError:
        try:
            temporary.unlink()
        except OSError:
            pass


def anonymous_id(identity: dict[str, str] | None = None) -> str:
    """Per-machine anonymous identifier, created and persisted on first use."""
    identity = _read_identity() if identity is None else identity
    existing = identity.get("anonymous_id")
    if existing:
        return existing
    created = f"code-anon-{uuid.uuid4().hex}"
    identity["anonymous_id"] = created
    _write_identity(identity)
    return created


def is_first_run() -> bool:
    """Whether this machine has never recorded a plugin event before."""
    return not _identity_path().exists()


def record(
    event: str,
    *,
    repo: Any = None,
    session_id: str | None = None,
    **properties: Any,
) -> None:
    """Append one event to the local spool. Never blocks and never raises."""
    if not is_enabled():
        return
    try:
        spool = _spool_path()
        try:
            if spool.stat().st_size > SPOOL_LIMIT_BYTES:
                return
        except OSError:
            pass
        properties = _safe_value(properties)
        # Stamped in the RECORDING process, beside harness. `source` used to be
        # read in the sending process from a module global, so whichever process
        # drained the spool named every event in it. flush() spreads per-event
        # properties last, so this now wins over any sender's default.
        properties.update(
            harness=_harness,
            source=_source_tag,
            plugin_version=memory_core.PLUGIN_VERSION,
            os=sys.platform,
            python_version=platform.python_version(),
        )
        if repo is not None:
            properties["repo_hash"] = _scoped_digest(getattr(repo, "identity", ""))
        if session_id:
            properties["session_hash"] = _scoped_digest(session_id)
        line = json.dumps(
            {
                "event": f"{EVENT_PREFIX}.{event}",
                "uuid": str(uuid.uuid4()),
                "timestamp": memory_core.utc_now(),
                "properties": {
                    key: value for key, value in properties.items() if value is not None
                },
            },
            separators=(",", ":"),
            default=str,
        )
        spool.parent.mkdir(parents=True, exist_ok=True)
        with spool.open("a", encoding="utf-8") as handle:
            handle.write(line + "\n")
    except Exception:
        pass


def error_kind(exc: BaseException | str) -> str:
    """Coarse, content-free label for a failure, safe to send."""
    text = exc if isinstance(exc, str) else f"{type(exc).__name__}: {exc}"
    lowered = text.lower()
    if "timed out" in lowered or "timeout" in lowered:
        return "timeout"
    if "401" in lowered or "403" in lowered or "unauthor" in lowered or "forbidden" in lowered:
        return "auth"
    if "429" in lowered or "rate limit" in lowered:
        return "rate-limited"
    if any(code in lowered for code in ("500", "502", "503", "504")):
        return "server-error"
    if "400" in lowered or "422" in lowered:
        return "bad-request"
    if isinstance(exc, str):
        return "other"
    if isinstance(exc, urllib.error.URLError):
        return "network"
    return type(exc).__name__


def spawn_flush() -> bool:
    """Start the detached sender that drains the spool."""
    if not is_enabled():
        return False
    try:
        if not _spool_path().exists() and not any(
            memory_core.data_dir().glob("telemetry-*.sending")
        ):
            return False
        subprocess.Popen(
            [sys.executable, str(Path(__file__).resolve())],
            stdin=subprocess.DEVNULL,
            stdout=subprocess.DEVNULL,
            stderr=subprocess.DEVNULL,
            close_fds=True,
            **memory_core.detached_process_kwargs(),
        )
        return True
    except Exception:
        return False


def _claim_name(attempt: int = 0) -> str:
    """Claim filename. The attempt count rides in the name so the 7-day expiry
    only ever discards a batch that was actually retried and failed."""
    return f"telemetry-{os.getpid()}-{uuid.uuid4().hex[:8]}-a{attempt}.sending"


def _claim_attempt(claim: Path) -> int:
    """Attempts recorded in a claim filename; 0 for the pre-attempt-count shape."""
    stem = claim.name[: -len(".sending")] if claim.name.endswith(".sending") else claim.name
    tail = stem.rsplit("-", 1)[-1]
    if tail.startswith("a") and tail[1:].isdigit():
        return int(tail[1:])
    return 0


def _touch(path: Path) -> None:
    """Refresh mtime so a claim's age measures time since it was claimed.

    ``Path.replace`` is ``os.rename``, which preserves mtime — so a claim created
    after a quiet minute inherited the spool's last-write time and looked
    abandoned the instant it was made. A second sender would then take it over
    while the first was still posting, and both would deliver the batch.
    """
    try:
        os.utime(path, None)
    except OSError:
        pass


def _claim_spool() -> Path | None:
    """Rename the spool aside so exactly one sender owns each batch."""
    directory = memory_core.data_dir()
    claim = directory / _claim_name()
    spool = _spool_path()
    try:
        spool.replace(claim)
        _touch(claim)
        return claim
    except OSError:
        pass
    return _claim_parked(directory)


def _claim_parked(directory: Path) -> Path | None:
    """Take the oldest abandoned claim, if any lease has actually expired.

    Kept separate from the live spool so flush() can drain both in one run.
    Previously parked batches were only reachable when no spool existed at all,
    and because sessions keep recording there usually was one — so a batch
    parked by a failed send waited until the 7-day expiry deleted it unsent,
    even though its own presence is what started the sender.
    """
    now = time.time()
    for orphan in sorted(directory.glob("telemetry-*.sending"), key=_safe_mtime):
        try:
            age = now - orphan.stat().st_mtime
        except OSError:
            continue
        if age > CLAIM_EXPIRY_SECONDS and _claim_attempt(orphan) >= MAX_CLAIM_ATTEMPTS:
            try:
                orphan.unlink()
            except OSError:
                pass
            continue
        if age < CLAIM_STALE_SECONDS:
            # Someone else holds a live lease on it.
            continue
        claim = orphan.parent / _claim_name(_claim_attempt(orphan) + 1)
        try:
            orphan.replace(claim)
            _touch(claim)
            return claim
        except OSError:
            continue
    return None


def _safe_mtime(path: Path) -> float:
    try:
        return path.stat().st_mtime
    except OSError:
        return 0.0


def _rewrite_claim(claim: Path, remaining: list[dict[str, Any]]) -> bool:
    """Persist the unsent remainder, atomically, and refresh the lease.

    Called after every successful batch. Two jobs: a retry resumes where the
    send stopped instead of re-posting from the top, and the rewrite doubles as
    the lease heartbeat, so a slow sender does not have its claim stolen
    mid-flight. Interval is one batch, well inside CLAIM_STALE_SECONDS.
    """
    if not remaining:
        try:
            claim.unlink()
        except OSError:
            pass
        return True
    temporary = claim.with_suffix(f".{os.getpid()}.partial")
    try:
        temporary.write_text(
            "".join(json.dumps(event, separators=(",", ":"), default=str) + "\n" for event in remaining),
            encoding="utf-8",
        )
        temporary.replace(claim)
        _touch(claim)
        return True
    except OSError:
        try:
            temporary.unlink()
        except OSError:
            pass
        return False


def _release_claim(claim: Path, remaining: list[dict[str, Any]]) -> None:
    """Persist the remainder and drop the lease, because this sender has given up.

    Distinct from the per-batch heartbeat: heartbeating on the way out would
    make an abandoned batch look actively owned for a further
    CLAIM_STALE_SECONDS, delaying the retry for no reason. Ageing it past the
    threshold lets the next flush pick it up immediately, while the attempt
    count in the filename still bounds how many times that can happen.
    """
    if not _rewrite_claim(claim, remaining):
        return
    try:
        released = time.time() - CLAIM_STALE_SECONDS - 1
        os.utime(claim, (released, released))
    except OSError:
        pass


def _resolve_email(key: str) -> str:
    """Trade the API key for the account email so events join other Mem0 surfaces."""
    url = os.environ.get("MEM0_API_URL", memory_core.DEFAULT_API_URL).rstrip("/") + "/v1/ping/"
    request = urllib.request.Request(
        url, headers={"Authorization": f"Token {key}", "Content-Type": "application/json"}
    )
    try:
        with urllib.request.urlopen(request, timeout=SEND_TIMEOUT) as response:
            payload = json.loads(response.read().decode("utf-8"))
    except Exception:
        return ""
    email = payload.get("user_email") if isinstance(payload, dict) else ""
    return email if isinstance(email, str) else ""


def _post(payload: dict[str, Any], url: str) -> bool:
    request = urllib.request.Request(
        url,
        data=json.dumps(payload, default=str).encode("utf-8"),
        headers={"Content-Type": "application/json"},
    )
    try:
        with urllib.request.urlopen(request, timeout=SEND_TIMEOUT):
            return True
    except Exception:
        return False


def resolve_distinct_id() -> tuple[str, str]:
    """Return the PostHog distinct id and the anonymous id it replaced, if any."""
    identity = _read_identity()
    email = identity.get("email", "")
    if email:
        return email, ""
    key = memory_core.api_key()
    if not key:
        return anonymous_id(identity), ""
    email = _resolve_email(key)
    if not email:
        return anonymous_id(identity), ""
    previous = identity.get("anonymous_id", "")
    identity["email"] = email
    _write_identity(identity)
    return email, previous


def flush() -> int:
    """Drain the live spool, then any parked claims, and return events sent."""
    if not is_enabled():
        return 0
    sent, delivered = _drain(_claim_spool())
    if not delivered:
        # The network is failing. Retrying other batches now would only burn
        # their attempt budget against the same broken connection.
        return sent

    # Parked batches used to starve behind the live spool indefinitely. Bounded
    # per run so a long backlog cannot turn one flush into an unbounded loop.
    directory = memory_core.data_dir()
    for _ in range(MAX_PARKED_PER_RUN):
        parked = _claim_parked(directory)
        if parked is None:
            break
        count, delivered = _drain(parked)
        sent += count
        if not delivered:
            break
    return sent


def _drain(claim: Path | None) -> tuple[int, bool]:
    """Post one claimed batch file, recording progress after every batch.

    Returns (events sent, whether everything was delivered).
    """
    if claim is None:
        return 0, True
    try:
        lines = claim.read_text(encoding="utf-8").splitlines()
    except OSError:
        return 0, True
    events = []
    for line in lines:
        try:
            value = json.loads(line)
        except json.JSONDecodeError:
            continue
        if isinstance(value, dict) and value.get("event"):
            events.append(value)
    if not events:
        try:
            claim.unlink()
        except OSError:
            pass
        return 0, True

    distinct_id, aliased_anonymous_id = resolve_distinct_id()
    if aliased_anonymous_id:
        _post(
            {
                "api_key": POSTHOG_API_KEY,
                "event": "$identify",
                "distinct_id": distinct_id,
                "properties": {
                    "$anon_distinct_id": aliased_anonymous_id,
                    "$lib": "posthog-python",
                },
            },
            POSTHOG_CAPTURE_URL,
        )

    sent = 0
    for start in range(0, len(events), BATCH_SIZE):
        chunk = events[start : start + BATCH_SIZE]
        batch = [
            {
                "event": event["event"],
                "distinct_id": distinct_id,
                # Carried through from record() so a resend can be collapsed.
                "uuid": event.get("uuid"),
                "timestamp": event.get("timestamp"),
                "properties": {
                    # Fallback only: events recorded by a build before source
                    # moved into record() have none of their own.
                    "source": _source_tag,
                    "language": "python",
                    "$process_person_profile": False,
                    "$lib": "posthog-python",
                    **(event.get("properties") or {}),
                },
            }
            for event in chunk
        ]
        if not _post({"api_key": POSTHOG_API_KEY, "batch": batch}, POSTHOG_BATCH_URL):
            # Keep only what has not been delivered, and release the lease.
            # Previously the whole file was kept and the retry re-posted every
            # batch, including the ones that had already arrived.
            _release_claim(claim, events[start:])
            return sent, False
        sent += len(chunk)
        # Record progress and refresh the lease after each successful batch, so
        # a crash repeats at most one batch instead of the entire file.
        _rewrite_claim(claim, events[start + len(chunk) :])
    return sent, True


def main() -> int:
    flush()
    return 0


if __name__ == "__main__":
    try:
        raise SystemExit(main())
    except Exception:
        raise SystemExit(0)