"""Optional LLM runtimes (Ollama / llama.cpp) beside SwarmUI."""

from __future__ import annotations

from dataclasses import dataclass
from pathlib import Path
from typing import Any
from urllib.parse import unquote, urlparse

import yaml

from gpu_rent.paths import (
    llamacpp_models_example_path,
    llamacpp_models_manifest_path,
    ollama_models_example_path,
    ollama_models_manifest_path,
)

VALID_RUNTIMES = frozenset({"none", "ollama", "llamacpp"})

OLLAMA_PRESETS: dict[str, list[str]] = {
    "recommended": ["huihui_ai/qwen2.5-abliterate:7b"],
    "light": ["qwen2.5:3b"],
    "stock": ["qwen2.5:7b"],
    "alt": ["richardyoung/qwen2.5-7b-instruct-abliterated"],
    "empty": [],
}

OLLAMA_PRESET_LABELS: dict[str, str] = {
    "recommended": "Qwen2.5 7B abliterate (RU/EN, мало отказов, ~5GB)",
    "light": "qwen2.5:3b (быстрее, слабее)",
    "stock": "официальный qwen2.5:7b (больше цензуры)",
    "alt": "другой abliterate-пак 7B",
    "empty": "только runtime, без pull",
    "keep": "не менять ollama-models.yaml",
}

# Deprecated text blob — prefer menu helpers below.
PRESET_HELP = "\n".join(
    f"{k} — {v}" for k, v in OLLAMA_PRESET_LABELS.items() if k != "keep"
)

LLAMACPP_PRESETS: dict[str, list[str]] = {
    "recommended": [
        "https://huggingface.co/bartowski/huihui-ai_Qwen2.5-7B-Instruct-abliterated-GGUF/resolve/main/huihui-ai_Qwen2.5-7B-Instruct-abliterated-Q4_K_M.gguf",
    ],
    "light": [
        "https://huggingface.co/bartowski/Qwen2.5-3B-Instruct-GGUF/resolve/main/Qwen2.5-3B-Instruct-Q4_K_M.gguf",
    ],
    "stock": [
        "https://huggingface.co/bartowski/Qwen2.5-7B-Instruct-GGUF/resolve/main/Qwen2.5-7B-Instruct-Q4_K_M.gguf",
    ],
    "empty": [],
}

LLAMACPP_PRESET_LABELS: dict[str, str] = {
    "recommended": "Qwen2.5 7B abliterate GGUF Q4_K_M (~4.7GB, мало отказов)",
    "light": "Qwen2.5 3B Instruct Q4_K_M (~2GB)",
    "stock": "официальный Qwen2.5 7B Instruct Q4_K_M",
    "empty": "только llama-server, GGUF вручную",
    "keep": "не менять llamacpp-models.yaml",
}

LLAMACPP_PRESET_HELP = "\n".join(
    f"{k} — {v}" for k, v in LLAMACPP_PRESET_LABELS.items() if k != "keep"
)

LLM_RUNTIME_LABELS: dict[str, str] = {
    "none": "только SwarmUI",
    "ollama": "Ollama (+ pull моделей)",
    "llamacpp": "llama.cpp server (+ GGUF)",
}

WORKLOAD_LABELS: dict[str, str] = {
    "swarm": "только SwarmUI",
    "both": "SwarmUI + LLM",
    "llm": "только LLM (без SwarmUI)",
}


def llm_runtime_menu() -> list:
    from gpu_rent.prompts import MenuItem

    return [MenuItem(k, f"{k} — {LLM_RUNTIME_LABELS[k]}") for k in ("none", "ollama", "llamacpp")]


def workload_menu() -> list:
    from gpu_rent.prompts import MenuItem

    return [MenuItem(k, WORKLOAD_LABELS[k]) for k in ("swarm", "both", "llm")]


def ollama_preset_menu(*, include_keep: bool = False) -> list:
    from gpu_rent.prompts import MenuItem

    keys = list(OLLAMA_PRESETS.keys())
    if include_keep:
        keys.append("keep")
    return [MenuItem(k, OLLAMA_PRESET_LABELS.get(k, k)) for k in keys]


def llamacpp_preset_menu(*, include_keep: bool = False) -> list:
    from gpu_rent.prompts import MenuItem

    keys = list(LLAMACPP_PRESETS.keys())
    if include_keep:
        keys.append("keep")
    return [MenuItem(k, LLAMACPP_PRESET_LABELS.get(k, k)) for k in keys]


@dataclass(frozen=True)
class OllamaModelEntry:
    name: str
    default: bool = False


@dataclass(frozen=True)
class LlamaCppModelEntry:
    url: str
    filename: str | None = None
    default: bool = False


def normalize_runtime(value: str | None) -> str:
    raw = (value or "none").strip().lower().replace("-", "").replace("_", "")
    if raw in {"", "none", "off", "no", "0"}:
        return "none"
    if raw in {"ollama"}:
        return "ollama"
    if raw in {"llamacpp", "llama", "llamacppserver"}:
        return "llamacpp"
    raise ValueError(f"неизвестный LLM_RUNTIME={value!r}; жду none|ollama|llamacpp")


def decide_runtime(
    *,
    flag: str | None,
    ollama_flag: bool,
    llamacpp_flag: bool,
    from_config: str,
) -> str:
    if ollama_flag and llamacpp_flag:
        raise ValueError("укажи только --ollama или --llamacpp, не оба")
    if ollama_flag:
        return "ollama"
    if llamacpp_flag:
        return "llamacpp"
    if flag is not None and str(flag).strip() != "":
        return normalize_runtime(flag)
    return normalize_runtime(from_config)


def parse_ollama_models(path: Path) -> list[OllamaModelEntry]:
    if not path.is_file():
        return []
    raw = yaml.safe_load(path.read_text(encoding="utf-8")) or {}
    if not isinstance(raw, dict):
        return []
    items = raw.get("models")
    if items is None:
        return []
    if not isinstance(items, list):
        raise ValueError(f"{path}: models должен быть списком")
    out: list[OllamaModelEntry] = []
    for item in items:
        if isinstance(item, str):
            name = item.strip()
            if name:
                out.append(OllamaModelEntry(name=name))
            continue
        if not isinstance(item, dict):
            continue
        name = str(item.get("name") or "").strip()
        if not name:
            continue
        out.append(OllamaModelEntry(name=name, default=bool(item.get("default"))))
    return out


def gguf_filename_from_url(url: str) -> str:
    path = unquote(urlparse(url).path)
    name = path.rsplit("/", 1)[-1] if path else ""
    if name.lower().endswith(".gguf"):
        return name
    return "model.gguf"


def parse_llamacpp_models(path: Path) -> list[LlamaCppModelEntry]:
    if not path.is_file():
        return []
    raw = yaml.safe_load(path.read_text(encoding="utf-8")) or {}
    if not isinstance(raw, dict):
        return []
    items = raw.get("models")
    if items is None:
        return []
    if not isinstance(items, list):
        raise ValueError(f"{path}: models должен быть списком")
    out: list[LlamaCppModelEntry] = []
    for item in items:
        if isinstance(item, str):
            url = item.strip()
            if url:
                out.append(LlamaCppModelEntry(url=url))
            continue
        if not isinstance(item, dict):
            continue
        url = str(item.get("url") or "").strip()
        if not url:
            continue
        fname = item.get("filename")
        filename = str(fname).strip() if fname else None
        out.append(
            LlamaCppModelEntry(
                url=url,
                filename=filename or None,
                default=bool(item.get("default")),
            )
        )
    return out


def write_ollama_models_preset(path: Path, preset: str) -> None:
    key = (preset or "recommended").strip().lower()
    if key not in OLLAMA_PRESETS:
        raise ValueError(f"пресет {preset!r}; варианты: {', '.join(OLLAMA_PRESETS)}")
    names = OLLAMA_PRESETS[key]
    lines = [
        "# Локальный манифест Ollama (не коммить). Пример: ollama-models.example.yaml",
        "# name = точный тег для `ollama pull`. Пустой models: [] — без pull.",
        "models:",
    ]
    if not names:
        lines.append("  []")
    else:
        for i, name in enumerate(names):
            lines.append(f"  - name: {name}")
            if i == 0:
                lines.append("    default: true")
    path.write_text("\n".join(lines) + "\n", encoding="utf-8")


def write_llamacpp_models_preset(path: Path, preset: str) -> None:
    key = (preset or "recommended").strip().lower()
    if key not in LLAMACPP_PRESETS:
        raise ValueError(f"пресет {preset!r}; варианты: {', '.join(LLAMACPP_PRESETS)}")
    urls = LLAMACPP_PRESETS[key]
    lines = [
        "# Локальный манифест llama.cpp GGUF (не коммить). Пример: llamacpp-models.example.yaml",
        "# url = прямой HTTPS на .gguf. Пустой models: [] — без скачивания.",
        "models:",
    ]
    if not urls:
        lines.append("  []")
    else:
        for i, url in enumerate(urls):
            lines.append(f"  - url: {url}")
            if i == 0:
                lines.append("    default: true")
    path.write_text("\n".join(lines) + "\n", encoding="utf-8")


def ensure_ollama_manifest_from_example() -> Path:
    dest = ollama_models_manifest_path()
    if dest.is_file():
        return dest
    example = ollama_models_example_path()
    if example.is_file():
        dest.write_text(example.read_text(encoding="utf-8"), encoding="utf-8")
    else:
        write_ollama_models_preset(dest, "recommended")
    return dest


def ensure_llamacpp_manifest_from_example() -> Path:
    dest = llamacpp_models_manifest_path()
    if dest.is_file():
        return dest
    example = llamacpp_models_example_path()
    if example.is_file():
        dest.write_text(example.read_text(encoding="utf-8"), encoding="utf-8")
    else:
        write_llamacpp_models_preset(dest, "recommended")
    return dest


def llm_local_port(cfg: Any) -> int | None:
    runtime = normalize_runtime(getattr(cfg, "llm_runtime", "none"))
    if runtime == "ollama":
        return int(getattr(cfg, "ollama_local_port", 17811))
    if runtime == "llamacpp":
        return int(getattr(cfg, "llamacpp_local_port", 17812))
    return None


def llm_remote_port(runtime: str) -> int | None:
    runtime = normalize_runtime(runtime)
    if runtime == "ollama":
        return 11434
    if runtime == "llamacpp":
        return 8080
    return None


def append_vars_llm_runtime(vars_file: Path, runtime: str) -> None:
    from gpu_rent.varsfile import upsert_vars

    upsert_vars(vars_file, {"LLM_RUNTIME": normalize_runtime(runtime)})