from pydantic import BaseModel, Field
from typing import List, Optional, Union, Any

import sys


from pydantic_settings import BaseSettings


class CliConfig(BaseSettings, cli_parse_args=True, cli_use_class_docs_for_groups=True):
    CONFIG_FILE: str = Field("./config.local.yaml", description="Config file path")


CLI_CONFIG = CliConfig(CONFIG_FILE="./config.local.yaml")


class SamplerConfig(BaseModel):
    """Default sampler configuration for each model."""

    max_tokens: int = Field(512, description="Maximum number of tokens to generate.")
    temperature: float = Field(1.0, description="Sampling temperature.")
    top_p: float = Field(0.3, description="Top-p sampling threshold.")
    presence_penalty: float = Field(0.5, description="Presence penalty.")
    count_penalty: float = Field(0.5, description="Count penalty.")
    penalty_decay: float = Field(0.996, description="Penalty decay factor.")
    stop: List[str] = Field(["\n\n"], description="List of stop sequences.")
    stop_tokens: List[int] = Field([0], description="List of stop tokens.")
    ALLOW_WEB_SEARCH: Optional[bool] = Field(None, description="Per-sampler override for allowing web search. If None, falls back to model/global.")
    ALLOW_FILE_TOOL: Optional[bool] = Field(None, description="Per-sampler override for allowing file tools (e.g., file_read). If None, falls back to model/global.")
    ALLOW_TOOLS: Optional[bool] = Field(None, description="Per-sampler override for allowing server-side tools. If None, falls back to model/global.")
    ALLOW_REASONING: Optional[bool] = Field(None, description="Per-sampler override for allowing built-in reasoning. If None, falls back to model/global.")
    # UI flags (non-functional in server, included so UI clients can show controls)
    SHOW_WEB_SEARCH_BUTTON: Optional[bool] = Field(None, description="Whether to show the web-search toggle in the client UI for this sampler")
    SHOW_FILE_UPLOAD_BUTTON: Optional[bool] = Field(None, description="Whether to show the file-upload control in the client UI for this sampler")
    SHOW_REASONING_TOGGLE: Optional[bool] = Field(None, description="Whether to show the reasoning (think) toggle in the client UI for this sampler")
    UI_STYLE: Optional[str] = Field(None, description="UI style hint that clients may use to render controls (example: 'whatsapp' or 'compact')")


class ModelConfig(BaseModel):
    """Configuration for each individual model."""

    SERVICE_NAME: str = Field(..., description="Service name of the model.")

    MODEL_FILE_PATH: Optional[str] = Field(None, description="Model file path.")

    DOWNLOAD_MODEL_FILE_NAME: Optional[str] = Field(
        None, description="Model name, should end with .pth"
    )
    DOWNLOAD_MODEL_REPO_ID: Optional[str] = Field(
        None, description="Model repository ID on Hugging Face Hub."
    )
    DOWNLOAD_MODEL_DIR: Optional[str] = Field(
        "./models", description="Directory to download the model to."
    )

    REASONING: bool = Field(
        False, description="Whether reasoning is enabled for this model."
    )

    DEFAULT_CHAT: bool = Field(False, description="Whether this model is the default chat model.")
    DEFAULT_REASONING: bool = Field(False, description="Whether this model is the default reasoning model.")
    DEFAULT_SAMPLER: SamplerConfig = Field(
        SamplerConfig(
            max_tokens=512,
            temperature=1.0,
            top_p=0.3,
            presence_penalty=0.5,
            count_penalty=0.5,
            penalty_decay=0.996,
            stop=["\n\n"],
            stop_tokens=[0],
            ALLOW_WEB_SEARCH=None,
            ALLOW_TOOLS=None,
            ALLOW_REASONING=None,
            ALLOW_FILE_TOOL=None,
            SHOW_WEB_SEARCH_BUTTON=None,
            SHOW_FILE_UPLOAD_BUTTON=None,
            SHOW_REASONING_TOGGLE=None,
            UI_STYLE=None,
        ),
        description="Default sampler configuration for this model."
    )
    VOCAB: str = Field("rwkv_vocab_v20230424", description="Vocab Name")
    # Allow or disallow server-side features on a per-model basis
    ALLOW_WEB_SEARCH: bool = Field(True, description="Whether this model supports web search injection")
    ALLOW_TOOLS: bool = Field(True, description="Whether this model supports server-side tools execution")
    ALLOW_REASONING: bool = Field(True, description="Whether this model supports built-in reasoning (in-process)")
    ALLOW_FILE_TOOL: bool = Field(True, description="Whether this model supports file-based tools (file_upload/file_read)")
    # UI flags for the model that the client may use to show/hide controls
    SHOW_WEB_SEARCH_BUTTON: bool = Field(True, description="Whether to show the web search toggle for this model in client UIs")
    SHOW_FILE_UPLOAD_BUTTON: bool = Field(True, description="Whether to show a file upload button for this model in client UIs")
    SHOW_REASONING_TOGGLE: bool = Field(True, description="Whether to show the reasoning toggle for this model in client UIs")


class RootConfig(BaseModel):
    """Root configuration for the RWKV service."""

    HOST: Optional[str] = Field("127.0.0.1", description="Host IP address to bind to.")
    PORT: Optional[int] = Field(8000, description="Port number to listen on.")
    STRATEGY: str = Field("cpu", description="Strategy for model execution (e.g., 'cuda fp16').")
    RWKV_CUDA_ON: bool = Field(False, description="Whether to enable RWKV CUDA kernel.")
    CHUNK_LEN: int = Field(256, description="Chunk length for processing.")
    MODELS: List[ModelConfig] = Field(..., description="List of model configurations.")
    # Additional defaults for auto behavior
    DEFAULT_STREAM: bool = Field(True, description="Whether streaming is enabled by default")
    AUTO_ENABLE_TOOLS: bool = Field(True, description="Whether to try auto-enabling tools based on intent")
    AUTO_ENABLE_REASONING: bool = Field(True, description="Whether to auto-enable reasoning when needed")
    AUTO_ENABLE_WEB_SEARCH: bool = Field(True, description="Whether to auto-enable web search based on intent")
    ENABLE_TOOLS_BY_DEFAULT: bool = Field(False, description="Whether tools are enabled by default (without explicit request)")
    ENABLE_WEB_SEARCH_BY_DEFAULT: bool = Field(True, description="Whether web search is enabled by default")
    ENABLE_REASONING_BY_DEFAULT: bool = Field(True, description="Whether model reasoning is enabled by default when requested/supported")
    # State store persistence
    STATE_STORE_PATH: str = Field("./state_store.json", description="Path to persist streaming/resume state store")
    STATE_STORE_FLUSH_INTERVAL: int = Field(5, description="Seconds between background flushes to the state store file")
    STATE_STORE_SAVE_ON_UPDATE: bool = Field(True, description="Whether to save the state store to disk immediately when updated")
    # File uploads / tools
    UPLOAD_DIR: str = Field("./uploads", description="Directory to store uploaded files")
    ALLOW_FILE_TOOL_BY_DEFAULT: bool = Field(True, description="Whether file-based tools are enabled by default")
    # UI flags for the root server. These flags are advisory only and do not enable functionality.
    SHOW_WEB_SEARCH_BUTTON_BY_DEFAULT: bool = Field(True, description="Whether to show web search toggle by default in clients")
    SHOW_FILE_UPLOAD_BUTTON_BY_DEFAULT: bool = Field(True, description="Whether to show file-upload control by default in clients")
    SHOW_REASONING_TOGGLE_BY_DEFAULT: bool = Field(True, description="Whether to show reasoning toggle by default in clients")


import yaml

try:
    with open(CLI_CONFIG.CONFIG_FILE, "r", encoding="utf-8") as f:
        CONFIG = RootConfig.model_validate(yaml.safe_load(f.read()))
except Exception as e:
    print(f"Pydantic Model Validation Failed: {e}")
    # Exit with non-zero to indicate error when config is invalid
    sys.exit(1)