"""Capture VM inventory into local models.yaml / extensions.yaml (links only)."""

from __future__ import annotations

import json
import shutil
from collections.abc import Callable
from dataclasses import dataclass, field
from importlib.resources import files
from pathlib import Path
from typing import Any
from urllib.parse import urlsplit, urlunsplit

import yaml

from gpu_rent.civitai import (
    civitai_model_url,
    fetch_model_version,
    fetch_model_version_by_hash,
    fetch_model_versions_by_hashes,
    version_ids_from_payload,
)
from gpu_rent.config import Config
from gpu_rent.errors import CloudError, GpuRentError
from gpu_rent.huggingface import lookup_by_sha256
from gpu_rent.manifests import (
    MODEL_TYPES,
    extract_version_id,
    parse_extensions,
    parse_models,
)
from gpu_rent.ssh_ops import run_python, run_ssh

Log = Callable[[str], None]
INVENTORY_REMOTE = "/tmp/gpu-rent-inventory.json"


def _pkg_text(name: str) -> str:
    return files("gpu_rent.remote").joinpath(name).read_text(encoding="utf-8")


def strip_git_auth(url: str) -> str:
    parts = urlsplit(url.strip())
    host = parts.hostname or ""
    if parts.port:
        host = f"{host}:{parts.port}"
    return urlunsplit((parts.scheme, host, parts.path, parts.query, parts.fragment))


@dataclass
class ModelCaptureItem:
    kind: str
    url: str
    title: str = ""
    rel: str = ""
    version_id: int | None = None
    model_id: int | None = None
    source: str = "civitai"  # civitai | huggingface


@dataclass
class ExtCaptureItem:
    kind: str
    url: str
    ref: str
    directory: str


@dataclass
class ResolveOutcome:
    """ok → item; unknown → not on Civitai; api_error → network/HTTP (retry later)."""

    item: ModelCaptureItem | None = None
    status: str = "unknown"  # ok | unknown | api_error
    detail: str = ""


@dataclass
class CaptureReport:
    models_new: list[ModelCaptureItem] = field(default_factory=list)
    models_skip: list[str] = field(default_factory=list)
    models_unknown: list[str] = field(default_factory=list)
    models_api_errors: list[str] = field(default_factory=list)
    ext_new: list[ExtCaptureItem] = field(default_factory=list)
    ext_updated: list[ExtCaptureItem] = field(default_factory=list)
    ext_skip: list[str] = field(default_factory=list)
    ext_unknown: list[str] = field(default_factory=list)
    models_path: Path | None = None
    extensions_path: Path | None = None
    wrote_models: bool = False
    wrote_extensions: bool = False


def fetch_inventory(cfg: Config, host: str, log: Log) -> dict[str, Any]:
    log("capture: сканирую Models / Extensions / DLNodes на VM…")
    run_python(
        cfg,
        host,
        _pkg_text("scan_inventory.py"),
        remote_path="/tmp/gpu-rent-scan_inventory.py",
        timeout=3600,
        log=log,
    )
    raw = run_ssh(cfg, host, f"cat {INVENTORY_REMOTE}", timeout=60)
    try:
        data = json.loads(raw)
    except json.JSONDecodeError as exc:
        raise CloudError(f"не разобрать inventory JSON: {exc}") from exc
    if not isinstance(data, dict):
        raise CloudError("inventory: ожидался object")
    return data


def resolve_model_item(
    raw: dict,
    *,
    token: str,
    api_host: str,
    link_host: str,
    hf_token: str | None = None,
) -> ResolveOutcome:
    kind = str(raw.get("kind") or "")
    if kind not in MODEL_TYPES:
        return ResolveOutcome(status="unknown", detail="bad kind")
    rel = str(raw.get("rel") or raw.get("name") or "?")
    version_id = raw.get("version_id")
    model_id = raw.get("model_id")
    title = Path(str(raw.get("name") or rel)).stem

    try:
        vid = int(version_id) if version_id is not None else None
    except (TypeError, ValueError):
        vid = None
    try:
        mid = int(model_id) if model_id is not None else None
    except (TypeError, ValueError):
        mid = None

    def _ok_civitai(v: int, m: int, name: str = title) -> ResolveOutcome:
        return ResolveOutcome(
            item=ModelCaptureItem(
                kind=kind,
                url=civitai_model_url(m, v, link_host),
                title=name,
                rel=rel,
                version_id=v,
                model_id=m,
                source="civitai",
            ),
            status="ok",
        )

    def _try_hf(sha: str, detail_prefix: str) -> ResolveOutcome | None:
        """Civitai miss → Hugging Face search by filename + LFS sha."""
        try:
            hit = lookup_by_sha256(
                hf_token,
                sha,
                filename=str(raw.get("name") or rel),
            )
        except CloudError as exc:
            return ResolveOutcome(
                status="api_error",
                detail=f"{detail_prefix}  HF: {exc}",
            )
        if hit is None:
            return None
        return ResolveOutcome(
            item=ModelCaptureItem(
                kind=kind,
                url=hit.url,
                title=hit.title or title,
                rel=rel,
                version_id=None,
                model_id=None,
                source="huggingface",
            ),
            status="ok",
        )

    if vid is not None and mid is not None:
        return _ok_civitai(vid, mid)

    # Partial sidecar: have version id → GET /model-versions/{id} for modelId.
    if vid is not None and mid is None:
        try:
            _h, version = fetch_model_version(token or "", api_host, vid)
        except CloudError as exc:
            msg = str(exc)
            if "404" in msg or "пустой files" in msg:
                return ResolveOutcome(
                    status="unknown",
                    detail=f"{rel}  version_id={vid} ({msg})",
                )
            return ResolveOutcome(
                status="api_error",
                detail=f"{rel}  version_id={vid}  {msg}",
            )
        vid2, mid2 = version_ids_from_payload(version)
        if vid2 is not None and mid2 is not None:
            name = str(version.get("name") or title)
            return _ok_civitai(vid2, mid2, name)
        return ResolveOutcome(
            status="unknown",
            detail=f"{rel}  version_id={vid} (нет modelId в ответе)",
        )

    sha = raw.get("sha256")
    if not sha:
        return ResolveOutcome(
            status="unknown",
            detail=f"{rel}  (нет sidecar и нет sha256)",
        )
    try:
        _host, version = fetch_model_version_by_hash(token or None, api_host, str(sha))
    except CloudError as exc:
        msg = str(exc)
        # 404 = genuinely not on Civitai → try HF
        if "HTTP 404" in msg or msg.rstrip().endswith("404"):
            hf_out = _try_hf(str(sha), f"{rel}  sha={str(sha)[:12]}…")
            if hf_out is not None:
                return hf_out
            return ResolveOutcome(
                status="unknown",
                detail=f"{rel}  sha={str(sha)[:12]}… (нет на Civitai/HF)",
            )
        return ResolveOutcome(
            status="api_error",
            detail=f"{rel}  sha={str(sha)[:12]}…  {msg}",
        )
    vid2, mid2 = version_ids_from_payload(version)
    if vid2 is None or mid2 is None:
        hf_out = _try_hf(str(sha), f"{rel}  sha={str(sha)[:12]}…")
        if hf_out is not None:
            return hf_out
        return ResolveOutcome(
            status="unknown",
            detail=f"{rel}  sha={str(sha)[:12]}… (пустой payload)",
        )
    name = str(version.get("name") or title)
    return _ok_civitai(vid2, mid2, name)


def _backup(path: Path) -> None:
    if path.is_file() and path.stat().st_size > 0:
        shutil.copy2(path, path.with_suffix(path.suffix + ".bak"))


def _keep_model_entry(it: dict) -> bool:
    if not isinstance(it, dict):
        return False
    url = it.get("url")
    if url:
        return True
    vid = it.get("version_id")
    return vid not in (None, "", 0, "0")


def _model_dedupe_key(kind: str, *, version_id: int | None, url: str | None) -> tuple:
    u = (url or "").rstrip("/").lower()
    if u and ("huggingface.co" in u or "hf.co/" in u):
        return ("hf", kind, u)
    if version_id is not None:
        return ("civitai", kind, int(version_id))
    return ("url", kind, u or "?")


def merge_models_yaml(
    path: Path,
    new_items: list[ModelCaptureItem],
    *,
    dry_run: bool,
) -> tuple[list[ModelCaptureItem], list[str]]:
    """Return (actually_new, skip_msgs). Dedupe by Civitai version_id or HF url."""
    existing = parse_models(path) if path.is_file() else []
    have: set[tuple] = set()
    for e in existing:
        vid = e.version_id
        if vid is None and e.url:
            vid = extract_version_id(e.url)
        have.add(_model_dedupe_key(e.kind, version_id=vid, url=e.url))

    added: list[ModelCaptureItem] = []
    skipped: list[str] = []
    seen_new: set[tuple] = set()
    for item in new_items:
        key = _model_dedupe_key(item.kind, version_id=item.version_id, url=item.url)
        if key in have or key in seen_new:
            label = (
                f"modelVersionId={item.version_id}"
                if item.version_id is not None
                else item.url
            )
            skipped.append(f"{item.kind} {item.title} {label}")
            continue
        seen_new.add(key)
        added.append(item)

    if dry_run or not added:
        return added, skipped

    data: dict[str, list[dict[str, str]]] = {k: [] for k in MODEL_TYPES}
    if path.is_file():
        raw = yaml.safe_load(path.read_text(encoding="utf-8")) or {}
        if isinstance(raw, dict):
            for kind in MODEL_TYPES:
                items = raw.get(kind) or []
                if isinstance(items, list):
                    for it in items:
                        if _keep_model_entry(it):
                            data[kind].append(dict(it))

    for item in added:
        data[item.kind].append({"url": item.url})

    out = {k: v for k, v in data.items() if v}
    _backup(path)
    path.parent.mkdir(parents=True, exist_ok=True)
    path.write_text(
        yaml.safe_dump(out, allow_unicode=True, default_flow_style=False, sort_keys=False),
        encoding="utf-8",
    )
    return added, skipped


def merge_extensions_yaml(
    path: Path,
    new_items: list[ExtCaptureItem],
    *,
    dry_run: bool,
) -> tuple[list[ExtCaptureItem], list[ExtCaptureItem], list[str]]:
    """Return (added, updated, skipped). Same dir + different URL → update url/ref."""
    data: dict[str, list[dict[str, Any]]] = {"swarmui": [], "comfy": []}
    if path.is_file():
        raw = yaml.safe_load(path.read_text(encoding="utf-8")) or {}
        if isinstance(raw, dict):
            for kind in ("swarmui", "comfy"):
                items = raw.get(kind) or []
                if isinstance(items, list):
                    for it in items:
                        if isinstance(it, dict) and it.get("url"):
                            data[kind].append(dict(it))

    def _dir_of(it: dict) -> str:
        d = it.get("dir")
        if d:
            return str(d).lower()
        url = strip_git_auth(str(it.get("url") or ""))
        name = url.rstrip("/").rsplit("/", 1)[-1]
        if name.endswith(".git"):
            name = name[:-4]
        return name.lower()

    added: list[ExtCaptureItem] = []
    updated: list[ExtCaptureItem] = []
    skipped: list[str] = []

    for item in new_items:
        clean = strip_git_auth(item.url)
        key_url = (item.kind, clean.rstrip("/").lower())
        key_dir = (item.kind, item.directory.lower())
        bucket = data.setdefault(item.kind, [])

        matched_url = False
        matched_dir_idx: int | None = None
        for idx, it in enumerate(bucket):
            it_url = strip_git_auth(str(it.get("url") or "")).rstrip("/").lower()
            if (item.kind, it_url) == key_url:
                matched_url = True
                break
            if (item.kind, _dir_of(it)) == key_dir:
                matched_dir_idx = idx

        if matched_url:
            skipped.append(f"{item.kind} {item.directory} {clean}")
            continue

        if matched_dir_idx is not None:
            old = bucket[matched_dir_idx]
            old_url = strip_git_auth(str(old.get("url") or ""))
            old_ref = str(old.get("ref") or "main")
            if old_url.rstrip("/").lower() == clean.rstrip("/").lower() and old_ref == item.ref:
                skipped.append(f"{item.kind} {item.directory} {clean}")
                continue
            old["url"] = clean
            old["ref"] = item.ref
            if not old.get("dir"):
                old["dir"] = item.directory
            updated.append(item)
            continue

        bucket.append({"url": clean, "ref": item.ref, "dir": item.directory})
        added.append(item)

    if dry_run or (not added and not updated):
        return added, updated, skipped

    out = {k: v for k, v in data.items() if v}
    _backup(path)
    path.parent.mkdir(parents=True, exist_ok=True)
    path.write_text(
        yaml.safe_dump(out, allow_unicode=True, default_flow_style=False, sort_keys=False),
        encoding="utf-8",
    )
    return added, updated, skipped


def capture_models(
    cfg: Config,
    host: str,
    inventory: dict[str, Any] | None,
    *,
    dry_run: bool,
    kind_filter: str | None,
    log: Log,
) -> CaptureReport:
    report = CaptureReport(models_path=cfg.models_manifest)
    inv = inventory if inventory is not None else fetch_inventory(cfg, host, log)
    raw_models = inv.get("models") or []
    if not isinstance(raw_models, list):
        raise CloudError("inventory.models: ожидался list")

    resolved: list[ModelCaptureItem] = []
    need_hash: list[dict] = []
    link_host = cfg.civitai_api_host or "civitai.red"
    token = cfg.civitai_api_token
    api_host = cfg.civitai_api_host
    hf_token = cfg.hf_token or None

    for raw in raw_models:
        if not isinstance(raw, dict):
            continue
        if kind_filter and str(raw.get("kind")) != kind_filter:
            continue
        vid = raw.get("version_id")
        mid = raw.get("model_id")
        try:
            vid_i = int(vid) if vid is not None else None
        except (TypeError, ValueError):
            vid_i = None
        try:
            mid_i = int(mid) if mid is not None else None
        except (TypeError, ValueError):
            mid_i = None
        sha = raw.get("sha256")

        # Full sidecar / ids → no API. Partial vid → GET version. Else batch by-hash.
        if vid_i is not None and mid_i is not None:
            outcome = resolve_model_item(
                raw,
                token=token,
                api_host=api_host,
                link_host=link_host,
                hf_token=hf_token,
            )
        elif vid_i is not None:
            outcome = resolve_model_item(
                raw,
                token=token,
                api_host=api_host,
                link_host=link_host,
                hf_token=hf_token,
            )
        elif sha:
            need_hash.append(raw)
            continue
        else:
            outcome = resolve_model_item(
                raw,
                token=token,
                api_host=api_host,
                link_host=link_host,
                hf_token=hf_token,
            )

        if outcome.status == "ok" and outcome.item is not None:
            resolved.append(outcome.item)
        elif outcome.status == "api_error":
            report.models_api_errors.append(outcome.detail or "?")
        else:
            report.models_unknown.append(outcome.detail or str(raw.get("rel") or "?"))

    if need_hash:
        digests = [str(r["sha256"]).strip().lower() for r in need_hash if r.get("sha256")]
        log(f"capture: by-hash batch {len(digests)} файл(ов)…")
        try:
            by_hash = fetch_model_versions_by_hashes(token or None, api_host, digests)
        except CloudError as exc:
            report.models_api_errors.append(f"by-hash batch: {exc}")
            by_hash = {}
            for raw in need_hash:
                rel = str(raw.get("rel") or "?")
                sha = str(raw.get("sha256") or "")[:12]
                report.models_api_errors.append(f"{rel}  sha={sha}… (batch failed)")
            need_hash = []

        hf_fallback = 0
        for raw in need_hash:
            sha = str(raw.get("sha256") or "").strip().lower()
            rel = str(raw.get("rel") or raw.get("name") or "?")
            version = by_hash.get(sha)
            if version:
                vid2, mid2 = version_ids_from_payload(version)
                if vid2 is not None and mid2 is not None:
                    kind = str(raw.get("kind") or "")
                    if kind not in MODEL_TYPES:
                        continue
                    title = str(
                        version.get("name") or Path(str(raw.get("name") or rel)).stem
                    )
                    resolved.append(
                        ModelCaptureItem(
                            kind=kind,
                            url=civitai_model_url(mid2, vid2, link_host),
                            title=title,
                            rel=rel,
                            version_id=vid2,
                            model_id=mid2,
                            source="civitai",
                        )
                    )
                    continue
            # Civitai miss → Hugging Face
            try:
                hit = lookup_by_sha256(
                    hf_token,
                    sha,
                    filename=str(raw.get("name") or rel),
                )
            except CloudError as exc:
                report.models_api_errors.append(f"{rel}  HF: {exc}")
                report.models_unknown.append(f"{rel}  sha={sha[:12]}…")
                continue
            if hit:
                kind = str(raw.get("kind") or "")
                if kind not in MODEL_TYPES:
                    continue
                hf_fallback += 1
                resolved.append(
                    ModelCaptureItem(
                        kind=kind,
                        url=hit.url,
                        title=hit.title or Path(str(raw.get("name") or rel)).stem,
                        rel=rel,
                        source="huggingface",
                    )
                )
            else:
                report.models_unknown.append(f"{rel}  sha={sha[:12]}… (нет на Civitai/HF)")

        if hf_fallback:
            log(f"capture: Hugging Face fallback — {hf_fallback} файл(ов)")

    added, skipped = merge_models_yaml(
        cfg.models_manifest, resolved, dry_run=dry_run
    )
    report.models_new = added
    report.models_skip = skipped
    report.wrote_models = bool(added) and not dry_run
    return report


def capture_extensions(
    cfg: Config,
    host: str,
    inventory: dict[str, Any] | None,
    *,
    dry_run: bool,
    log: Log,
) -> CaptureReport:
    report = CaptureReport(extensions_path=cfg.extensions_manifest)
    inv = inventory if inventory is not None else fetch_inventory(cfg, host, log)
    raw_ext = inv.get("extensions") or []
    if not isinstance(raw_ext, list):
        raise CloudError("inventory.extensions: ожидался list")

    resolved: list[ExtCaptureItem] = []
    for raw in raw_ext:
        if not isinstance(raw, dict):
            continue
        if raw.get("unknown") or not raw.get("url"):
            name = str(raw.get("dir") or "?")
            reason = str(raw.get("reason") or "unknown")
            report.ext_unknown.append(f"{raw.get('kind')}/{name} ({reason})")
            continue
        kind = str(raw.get("kind") or "")
        if kind not in ("swarmui", "comfy"):
            continue
        resolved.append(
            ExtCaptureItem(
                kind=kind,
                url=strip_git_auth(str(raw["url"])),
                ref=str(raw.get("ref") or "main"),
                directory=str(raw.get("dir") or "extension"),
            )
        )

    added, updated, skipped = merge_extensions_yaml(
        cfg.extensions_manifest, resolved, dry_run=dry_run
    )
    report.ext_new = added
    report.ext_updated = updated
    report.ext_skip = skipped
    report.wrote_extensions = (bool(added) or bool(updated)) and not dry_run
    return report


def merge_reports(a: CaptureReport, b: CaptureReport) -> CaptureReport:
    return CaptureReport(
        models_new=a.models_new + b.models_new,
        models_skip=a.models_skip + b.models_skip,
        models_unknown=a.models_unknown + b.models_unknown,
        models_api_errors=a.models_api_errors + b.models_api_errors,
        ext_new=a.ext_new + b.ext_new,
        ext_updated=a.ext_updated + b.ext_updated,
        ext_skip=a.ext_skip + b.ext_skip,
        ext_unknown=a.ext_unknown + b.ext_unknown,
        models_path=a.models_path or b.models_path,
        extensions_path=a.extensions_path or b.extensions_path,
        wrote_models=a.wrote_models or b.wrote_models,
        wrote_extensions=a.wrote_extensions or b.wrote_extensions,
    )


def capture_all(
    cfg: Config,
    host: str,
    *,
    dry_run: bool,
    kind_filter: str | None = None,
    log: Log,
) -> CaptureReport:
    inv = fetch_inventory(cfg, host, log)
    m = capture_models(
        cfg, host, inv, dry_run=dry_run, kind_filter=kind_filter, log=log
    )
    e = capture_extensions(cfg, host, inv, dry_run=dry_run, log=log)
    return merge_reports(m, e)


def print_report(
    report: CaptureReport,
    log: Log,
    *,
    dry_run: bool,
    show_models: bool = True,
    show_extensions: bool = True,
) -> None:
    prefix = "[dry-run] " if dry_run else ""
    if show_models:
        log(
            f"{prefix}models: +{len(report.models_new)} new, "
            f"{len(report.models_skip)} already in yaml, "
            f"{len(report.models_unknown)} unknown (no Civitai), "
            f"{len(report.models_api_errors)} api errors"
        )
        for item in report.models_new:
            log(f"  + {item.kind}  {item.title}  modelVersionId={item.version_id}")
        for line in report.models_unknown:
            log(f"  ? {line}")
        for line in report.models_api_errors:
            log(f"  ! {line}")

    if show_extensions:
        log(
            f"{prefix}extensions: +{len(report.ext_new)} new, "
            f"~{len(report.ext_updated)} updated, "
            f"{len(report.ext_skip)} already, "
            f"{len(report.ext_unknown)} unknown"
        )
        for item in report.ext_new:
            log(f"  + {item.kind}  {item.directory}  {item.url} @{item.ref}")
        for item in report.ext_updated:
            log(f"  ~ {item.kind}  {item.directory}  {item.url} @{item.ref}")
        for line in report.ext_unknown:
            log(f"  ? {line}")

    if dry_run:
        log("dry-run — файлы не записаны")
        return
    if report.wrote_models and report.models_path:
        log(f"wrote {report.models_path} (backup {report.models_path.name}.bak)")
    if report.wrote_extensions and report.extensions_path:
        log(
            f"wrote {report.extensions_path} "
            f"(backup {report.extensions_path.name}.bak)"
        )
    if not report.wrote_models and not report.wrote_extensions:
        log("нечего добавлять")