"""Deployment orchestrator — generic bot hosting.

Deploys *any* bot to its own HF Space by cloning its source repository.
The panel itself ships no bot code — every bot's runtime comes from its
``source_repo`` field.

Supported source types:
  * ``hf``     — another HuggingFace repo (model/dataset/space).  We
                 ``snapshot_download`` it and ``upload_folder`` to the
                 Space.
  * ``github`` — any git URL.  We shallow-clone it and upload the tree.

After the code is in place, we set ``HF Space secrets`` for whatever
the bot has configured (Telegram token, NVIDIA key, etc.) and
``HF Space variables`` for ``env_vars_json``.
"""
from __future__ import annotations

import contextlib
import json
import logging
import os
import shutil
import subprocess
import tempfile
from pathlib import Path
from typing import Any, Optional

from huggingface_hub import HfApi

from auth import VAULT
from bot_runner import bot_workdir, start_bot, stop_bot as runner_stop, set_record_quota
from bot_store import materialize_source, push_source, push_run_log
from config import PANEL_CONFIG
from models import (
    BotInstance,
    BotStatus,
    DeploymentLog,
    DeploymentMode,
    SPACE_STATE_ON_DATASET,
    SPACE_STATE_ON_SPACE,
    SPACE_STATE_ON_SPACE_KEPT,
    SPACE_STATE_PENDING_MATERIALIZE,
)

log = logging.getLogger("hosting-panel.deploy")


class DeployError(Exception):
    pass


class DeployOrchestrator:
    """Manages a bot's deployment lifecycle on HuggingFace Spaces."""

    def __init__(self, hf_token: str = "") -> None:
        self.hf_token = hf_token
        self._api: Optional[HfApi] = None

    def _get_api(self) -> HfApi:
        if self._api is None:
            self._api = HfApi(token=self.hf_token)
        return self._api

    @contextlib.contextmanager
    def _use_token(self, token: str):
        """Temporarily swap ``self.hf_token`` for the duration of the
        ``with`` block, then restore it.

        Used by legacy-space deploys: those operate on the bot's own
        HF token (because the bot owns its Space), so we need the
        bot's token in scope without permanently overwriting the
        orchestrator's panel-level token.  Restoring on every exit
        path (including exceptions) prevents cross-bot token
        confusion on subsequent deploys.

        If ``token`` is empty, ``self.hf_token`` is left untouched —
        we never want to clobber the panel's token with ``""``,
        because the next HF API call would fail unauthenticated.
        """
        if not token:
            yield
            return
        saved = self.hf_token
        self.hf_token = token
        # Also reset the cached HfApi — it was bound to the old token.
        self._api = None
        try:
            yield
        finally:
            self.hf_token = saved
            self._api = None

    # ------------------------------------------------------------------
    # Source resolution — pull the bot's repo into a local temp dir.
    # ------------------------------------------------------------------

    def _resolve_owner(self, bot: BotInstance) -> str:
        """Get the HF owner/namespace from the bot's HF dataset repo or
        space name.  Required because HF Spaces need an explicit
        owner/name target.
        """
        # Prefer the dataset repo's owner — it's usually the same
        # username that owns the bot's Space.
        for ref in (bot.hf_dataset_repo, bot.hf_space_name):
            if ref and "/" in ref:
                return ref.split("/", 1)[0]
        # Fall back to the HF token's namespace (best-effort).
        try:
            info = self._get_api().whoami(token=self.hf_token)
            return info.get("name") or info.get("fullname") or ""
        except Exception:
            return ""

    def _resolve_space_name(self, bot: BotInstance) -> str:
        return bot.hf_space_name or bot.slug

    def _resolve_repo_id(self, bot: BotInstance) -> str:
        owner = self._resolve_owner(bot)
        if not owner:
            raise DeployError("Cannot determine HF owner. Set hf_dataset_repo or hf_space_name.")
        return f"{owner}/{self._resolve_space_name(bot)}"

    async def _fetch_source(self, bot: BotInstance, dest: Path) -> None:
        """Materialise the bot's source into ``dest``.

        Supports HF Hub repos and GitHub (any git URL).
        """
        repo = bot.source_repo
        if not repo:
            raise DeployError(
                "Bot has no source_repo configured. Set it in the bot's edit form "
                "to the HuggingFace repo or GitHub URL containing the bot code."
            )

        if bot.source_type == "github":
            await self._fetch_github(bot, repo, bot.source_branch, dest)
        else:
            await self._fetch_hf(repo, dest)

    async def _fetch_hf(self, repo_id: str, dest: Path) -> None:
        from huggingface_hub import snapshot_download

        def _do():
            return snapshot_download(
                repo_id=repo_id,
                repo_type="space",   # spaces have Dockerfile + app config
                local_dir=str(dest),
                token=self.hf_token,
            )
        await self._run(_do)

    async def _fetch_github(
        self,
        bot: BotInstance,
        url: str,
        branch: str,
        dest: Path,
    ) -> None:
        """Shallow-clone a git URL into ``dest``.

        Token authentication (for private repos): if the URL is plain
        ``https://github.com/owner/repo.git`` we inject an embedded
        token.  For other providers the user must include the token
        themselves in the URL.

        ``bot`` is required so we can read ``bot.env_vars_json`` for
        the optional ``GITHUB_TOKEN`` / ``GH_TOKEN`` env var.  The
        previous version of this method referenced an undefined
        ``bot`` closure variable and would raise ``NameError`` on
        the first private-repo clone.
        """
        clone_url = url
        if url.startswith("https://github.com/"):
            # HuggingFace tokens can't auth GitHub directly, but we
            # accept a separate ``GITHUB_TOKEN``-style token in
            # env_vars if the user wants private-repo access.
            gh_token = ""
            if bot.env_vars_json:
                try:
                    extra = json.loads(bot.env_vars_json)
                    gh_token = str(
                        extra.get("GITHUB_TOKEN") or extra.get("GH_TOKEN") or ""
                    )
                except Exception:
                    gh_token = ""
            if gh_token:
                clone_url = url.replace(
                    "https://github.com/",
                    f"https://oauth2:{gh_token}@github.com/",
                )

        def _do():
            subprocess.run(
                ["git", "clone", "--depth", "1", "--branch", branch, clone_url, str(dest)],
                check=True,
                capture_output=True,
            )
        await self._run(_do)

    # ------------------------------------------------------------------
    # Async runner — huggingface_hub + git are sync, so we offload.
    # ------------------------------------------------------------------

    async def _run(self, fn, *args, **kwargs):
        import asyncio
        loop = asyncio.get_event_loop()
        def _call():
            try:
                return fn(*args, **kwargs)
            except subprocess.CalledProcessError as exc:
                stderr = (exc.stderr or b"").decode("utf-8", "replace")
                raise DeployError(f"git failed: {stderr.strip() or exc}") from exc
            except Exception as exc:
                raise DeployError(str(exc)) from exc
        return await loop.run_in_executor(None, _call)

    # ------------------------------------------------------------------
    # HF Space lifecycle
    # ------------------------------------------------------------------

    async def create_hf_space(
        self,
        owner: str,
        space_name: str,
        sdk: str = "docker",
        hardware: str = "cpu-basic",
        private: bool = True,
    ) -> Any:
        def _do():
            return self._get_api().create_repo(
                repo_id=f"{owner}/{space_name}",
                repo_type="space",
                space_sdk=sdk,
                space_hardware=hardware,
                private=private,
                exist_ok=True,
            )
        return await self._run(_do)

    # ------------------------------------------------------------------
    # Push the bot's source tree to the Space
    # ------------------------------------------------------------------

    async def push_source(self, bot: BotInstance, source_dir: Path, message: str = "") -> None:
        """Upload the local ``source_dir`` to the bot's HF Space."""
        owner = self._resolve_owner(bot)
        if not owner:
            raise DeployError("Cannot determine HF owner.")
        repo_id = f"{owner}/{self._resolve_space_name(bot)}"

        def _do():
            self._get_api().upload_folder(
                folder_path=str(source_dir),
                repo_id=repo_id,
                repo_type="space",
                commit_message=message or f"Deploy {bot.slug}",
                token=self.hf_token,
            )
        await self._run(_do)

    # ------------------------------------------------------------------
    # Secret / env push
    # ------------------------------------------------------------------

    async def set_secrets(self, bot: BotInstance, secrets: dict[str, str]) -> None:
        """Push encrypted secrets to the HF Space."""
        if not secrets:
            return
        owner = self._resolve_owner(bot)
        repo_id = f"{owner}/{self._resolve_space_name(bot)}"

        def _do():
            for k, v in secrets.items():
                if v is None or v == "":
                    continue
                try:
                    self._get_api().add_space_secret(
                        repo_id=repo_id, key=k, value=v, token=self.hf_token,
                    )
                except Exception as exc:
                    log.warning("Failed to set HF secret %s: %s", k, exc)
        await self._run(_do)

    # ------------------------------------------------------------------
    # End-to-end deploy
    # ------------------------------------------------------------------

    async def deploy_bot(self, bot: BotInstance, db_session: Any) -> None:
        """Full deploy.

        Dispatches on ``bot.deployment_mode``:
        - ``MULTITENANT``: pull source, push to shared dataset, write env
          file, spawn subprocess on the bot's allocated port.
        - ``LEGACY_SPACE``: create dedicated HF Space (legacy path).
        """
        if bot.deployment_mode == DeploymentMode.MULTITENANT:
            await self._deploy_multitenant(bot, db_session)
        else:
            await self._deploy_legacy_space(bot, db_session)

    # ------------------------------------------------------------------
    # Multi-tenant deploy path
    # ------------------------------------------------------------------

    async def _deploy_multitenant(
        self, bot: BotInstance, db_session: Any,
    ) -> None:
        """Pull source в†’ push to shared dataset в†’ write .env в†’ spawn subprocess."""
        if not bot.port or not bot.space_id:
            raise DeployError(
                "Bot has no space/port allocated; cannot deploy multi-tenant."
            )

        # 1. Pull source into the bot's local workdir.
        bot.status = BotStatus.STARTING
        # Track where the bot's source lives relative to its Space.
        # 'on_dataset' is the resting state after a stop; once we
        # start copying to the local workdir we move through
        # 'pending_materialize' and finally land on 'on_space'.
        bot.space_state = SPACE_STATE_PENDING_MATERIALIZE
        await db_session.commit()

        wd = bot_workdir(bot.id)
        # Fetch source: either from the configured source_repo or, if
        # the bot has no source_repo, we re-materialise from the
        # shared dataset (zip upload path).
        if bot.source_repo:
            try:
                await self._fetch_source_to(bot, wd)
            except DeployError as exc:
                # Source might already be in shared dataset from a
                # previous upload -- still try to materialise.
                log.warning("source_repo fetch failed (%s); falling back to dataset", exc)
                materialize_source(bot)
        else:
            materialize_source(bot)

        if not wd.exists() or not any(wd.iterdir()):
            raise DeployError(
                "Bot has no source files. Upload a zip or set source_repo."
            )

        # Materialisation succeeded \u2014 files now live on the Space's
        # local filesystem in addition to the central HF Dataset.
        bot.space_state = SPACE_STATE_ON_SPACE

        # 2. Push source to the shared dataset (so other Spaces can
        # materialise the same bot if/when this Space is replaced).
        try:
            push_source(bot, wd, message=f"deploy {bot.slug}")
        except Exception as exc:
            log.warning("push_source to dataset failed (non-fatal): %s", exc)

        # 3. Write the bot's env file (secrets + user env vars) into
        # the workdir.  This is read by the bot's run.sh / app.py at
        # boot via os.environ or a small loader.
        secrets = self._collect_secrets(bot)
        # Add the 4 admin-panel secrets; these are exposed to the bot
        # as ADMIN_LOGIN / ADMIN_PASSWORD / SECRET_WORD / SECRET_NUMBER.
        # They're two-tier encrypted in the DB, so we need the owner's
        # per-user Fernet key to decrypt.
        from auth import PER_USER_KEYS
        from models import User as _User
        owner = await db_session.get(_User, bot.owner_id)
        user_key = PER_USER_KEYS.get_user_key(owner) if owner else None
        admin_secret_keys = (
            ("ADMIN_LOGIN",    bot.admin_login_enc),
            ("ADMIN_PASSWORD", bot.admin_password_enc),
            ("SECRET_WORD",    bot.secret_word_enc),
            ("SECRET_NUMBER",  bot.secret_number_enc),
        )
        for env_key, enc in admin_secret_keys:
            if not enc:
                continue
            try:
                secrets[env_key] = VAULT.decrypt(enc, user_key=user_key) if user_key else VAULT.decrypt(enc)
            except Exception as exc:
                log.warning("Could not decrypt %s for bot %s: %s",
                            env_key, bot.id, exc)

        env_lines: list[str] = []
        for k, v in secrets.items():
            # Escape any embedded double-quotes / newlines.
            v_esc = v.replace("\\", "\\\\").replace('"', '\\"').replace("\n", "\\n")
            env_lines.append(f'{k}="{v_esc}"')
        if bot.env_vars_json:
            try:
                for k, v in json.loads(bot.env_vars_json).items():
                    if v in (None, ""):
                        continue
                    v_esc = str(v).replace("\\", "\\\\").replace('"', '\\"')
                    env_lines.append(f'{k}="{v_esc}"')
            except json.JSONDecodeError:
                log.warning("bot %s has invalid env_vars_json; skipping", bot.id)
        env_lines.append(f'PANEL_BOT_PORT={bot.port}')
        env_lines.append(f'PANEL_BOT_ID={bot.id}')
        env_file = wd / ".env"
        env_file.write_text("\n".join(env_lines) + "\n", encoding="utf-8")
        try:
            os.chmod(env_file, 0o600)
        except Exception:
            pass

        # 4. Spawn the subprocess.
        try:
            set_record_quota(bot.id, bot.ram_mb or 0)
            rec = await start_bot(bot)
            log.info(
                "Bot %s running locally: pid=%d port=%d",
                bot.slug, rec.pid, rec.port,
            )
        except Exception as exc:
            bot.status = BotStatus.ERROR
            await db_session.commit()
            db_session.add(DeploymentLog(
                bot_id=bot.id, action="deploy", status="failed",
                message=f"start_bot failed: {exc}",
            ))
            await db_session.commit()
            raise DeployError(f"Failed to start subprocess: {exc}") from exc

        # 5. Persist state.
        bot.status = BotStatus.RUNNING
        await db_session.commit()

        db_session.add(DeploymentLog(
            bot_id=bot.id, action="deploy", status="success",
            message=(
                f"Multi-tenant deploy on space {bot.space_id} port {bot.port} "
                f"(pid {rec.pid}, {bot.cpu_cores} CPU / {bot.ram_mb} MB)."
            ),
            details_json=json.dumps({
                "mode": "multitenant",
                "space_id": bot.space_id,
                "port": bot.port,
                "pid": rec.pid,
                "cpu_cores": bot.cpu_cores,
                "ram_mb": bot.ram_mb,
                "source_repo": bot.source_repo,
                "source_type": bot.source_type,
                "secrets_count": len(secrets),
            }),
        ))
        await db_session.commit()

        # 6. Best-effort: flush run log placeholder to dataset.
        try:
            push_run_log(bot, "latest", message="deploy start")
        except Exception:
            pass

    async def _fetch_source_to(self, bot: BotInstance, dest: Path) -> None:
        """Same as _fetch_source but uses the given dest."""
        # _fetch_source always goes to a tempdir; we adapt by passing
        # the workdir directly via a tempdir-shaped call.
        repo = bot.source_repo
        if not repo:
            raise DeployError("Bot has no source_repo.")
        if bot.source_type == "github":
            await self._fetch_github(bot, repo, bot.source_branch, dest)
        else:
            await self._fetch_hf(repo, dest)

    # ------------------------------------------------------------------
    # Legacy one-bot-per-Space deploy path (unchanged behaviour)
    # ------------------------------------------------------------------

    async def _deploy_legacy_space(self, bot: BotInstance, db_session: Any) -> None:
        hf_token = VAULT.decrypt(bot.hf_token_enc) if bot.hf_token_enc else ""
        if not hf_token:
            raise DeployError("HF token not configured for this bot")
        # Use the bot own HF token for the duration of the deploy
        # (bot owns the Space), but restore the panel token on
        # every exit path.  Without _use_token the previous code
        # permanently clobbered self.hf_token and silently routed
        # subsequent bot deploys through the wrong HF account.
        # NOTE: concurrent deploys of different bots on the same
        # orchestrator instance remain unsupported - serialise at
        # the route layer.
        with self._use_token(hf_token):
            owner = self._resolve_owner(bot)
            if not owner:
                raise DeployError(
                    "Cannot resolve HF owner. Set hf_dataset_repo or hf_space_name."
                )
            repo_id = f"{owner}/{self._resolve_space_name(bot)}"

            # 1. Create the Space if missing
            try:
                await self.create_hf_space(owner, self._resolve_space_name(bot), private=True)
                log.info("HF Space %s created or already exists", repo_id)
            except DeployError as exc:
                log.warning("HF Space create: %s", exc)

            # 2. Fetch the source tree into a temp dir
            with tempfile.TemporaryDirectory(prefix=f"deploy-{bot.slug}-") as tmp:
                src = Path(tmp)
                try:
                    await self._fetch_source(bot, src)
                except DeployError as exc:
                    raise DeployError(f"Failed to fetch source: {exc}") from exc

                # Basic sanity: a Docker-based Space needs a Dockerfile.
                if not (src / "Dockerfile").exists():
                    log.warning("Source has no Dockerfile — HF Space may not start.")

                # 3. Push the tree to the Space
                await self.push_source(bot, src, message=f"Deploy {bot.slug} via panel")

            # 4. Set encrypted secrets (whatever the bot has configured).
            secrets = self._collect_secrets(bot)
            await self.set_secrets(bot, secrets)

            # 5. Set user env vars (non-secret) as Space variables.
            if bot.env_vars_json:
                try:
                    extra = json.loads(bot.env_vars_json)
                    if extra:
                        await self.set_env_vars(bot, extra)
                except json.JSONDecodeError:
                    log.warning("bot %s has invalid env_vars_json; skipping", bot.id)

            # 6. Update status and persist the resolved URL.
            bot.status = BotStatus.BUILDING
            bot.hf_space_url = f"https://huggingface.co/spaces/{repo_id}"
            await db_session.commit()

            log_entry = DeploymentLog(
                bot_id=bot.id,
                action="deploy",
                status="success",
                message=f"HF Space {repo_id} configured. Source from {bot.source_repo or '?'}.",
                details_json=json.dumps({
                    "source_repo": bot.source_repo,
                    "source_type": bot.source_type,
                    "branch": bot.source_branch,
                    "secrets_count": len(secrets),
                }),
            )
            db_session.add(log_entry)
            await db_session.commit()

    async def set_env_vars(self, bot: BotInstance, env: dict[str, str]) -> None:
        """Push user env vars to the Space as variables."""
        owner = self._resolve_owner(bot)
        repo_id = f"{owner}/{self._resolve_space_name(bot)}"

        def _do():
            for k, v in env.items():
                if v is None or v == "":
                    continue
                try:
                    self._get_api().add_space_variable(
                        repo_id=repo_id, key=k, value=v, token=self.hf_token,
                    )
                except Exception as exc:
                    log.warning("Failed to set HF variable %s: %s", k, exc)
        await self._run(_do)

    # ------------------------------------------------------------------
    # Helpers
    # ------------------------------------------------------------------

    def _collect_secrets(self, bot: BotInstance) -> dict[str, str]:
        """Decrypt and return every secret the bot has configured.

        Anything that's blank is omitted — the deploy never pushes empty
        strings.  Only fields that are actually filled in are sent.
        """
        out: dict[str, str] = {}

        def add(key: str, enc: Optional[str]) -> None:
            if not enc:
                return
            try:
                value = VAULT.decrypt(enc)
            except Exception:
                log.warning("Failed to decrypt %s for bot %s", key, bot.id)
                return
            if value:
                out[key] = value

        add("BOT_TOKEN",       bot.bot_token_enc)
        add("HF_TOKEN",        bot.hf_token_enc)
        add("NVIDIA_API_KEY",  bot.nvidia_api_key_enc)
        add("LLM_PROXY_TOKEN", bot.llm_proxy_token_enc)

        # Optional plaintext values (the bot owner can override).
        if bot.nvidia_model:
            out["NVIDIA_MODEL"] = bot.nvidia_model
        if bot.hf_dataset_repo:
            out["HF_DATASET_REPO"] = bot.hf_dataset_repo
        if bot.render_url:
            out["LLM_PROXY_URL"]      = bot.render_url
            out["TELEGRAM_PROXY_URL"] = bot.render_url.rstrip("/") + "/telegram"
            out["RENDER_URL"]         = bot.render_url

        # Platform-wide Render proxy (overrides bot.render_url if set).
        try:
            from proxy_client import bot_env_extras
            out.update(bot_env_extras())
        except Exception as exc:
            log.warning("proxy_client.bot_env_extras failed: %s", exc)

        return out

    async def stop_bot(self, bot: BotInstance, db_session: Any) -> None:
        """Stop a bot.  Multi-tenant kills the local subprocess; legacy
        pauses the HF Space.
        """
        if bot.deployment_mode == DeploymentMode.MULTITENANT:
            try:
                await runner_stop(bot)
                from bot_runner import clear_record_quota
                clear_record_quota(bot.id)
            except Exception as exc:
                log.warning("runner_stop failed for %s: %s", bot.slug, exc)
            bot.status = BotStatus.STOPPED
            # After stop the on-Space files are kept (so the next start
            # is instant); the dataset remains the source of truth.
            bot.space_state = SPACE_STATE_ON_SPACE_KEPT
            await db_session.commit()
            db_session.add(DeploymentLog(
                bot_id=bot.id, action="stop", status="success",
                message="Multi-tenant bot stopped",
            ))
            await db_session.commit()
            return

        # Legacy HF Space pause.
        hf_token = VAULT.decrypt(bot.hf_token_enc) if bot.hf_token_enc else ""
        # Same save/restore pattern as _deploy_legacy_space: operate on
        # the bot's token without permanently clobbering the panel's.
        # ``_use_token("")`` is a no-op (we never want to blank the
        # panel token — keep using it if the bot has none).
        with self._use_token(hf_token):
            owner = self._resolve_owner(bot)
            if not owner:
                bot.status = BotStatus.STOPPED
                await db_session.commit()
                return
            repo_id = f"{owner}/{self._resolve_space_name(bot)}"

            def _do():
                try:
                    self._get_api().pause_space(repo_id=repo_id, token=self.hf_token)
                except Exception as exc:
                    log.warning("pause_space failed for %s: %s", repo_id, exc)
            await self._run(_do)

            bot.status = BotStatus.STOPPED
            await db_session.commit()
            log_entry = DeploymentLog(
                bot_id=bot.id, action="stop", status="success",
                message="Bot stopped via panel",
            )
            db_session.add(log_entry)
            await db_session.commit()