"""Settings for the Chattr app."""

from enum import Enum
from logging import CRITICAL, DEBUG, ERROR, INFO, NOTSET, WARNING
from pathlib import Path
from typing import Self

from agno.utils.log import log_error, log_info
from dotenv import load_dotenv
from pydantic import (
    BaseModel,
    DirectoryPath,
    Field,
    FilePath,
    HttpUrl,
    SecretStr,
    computed_field,
    model_validator,
)
from pydantic_settings import BaseSettings, SettingsConfigDict

from chattr.app.scheme import MCPScheme

load_dotenv()


class MemorySettings(BaseModel):
    """Settings for memory configuration."""

    collection_name: str = Field(default="memories")
    embedding_dims: int = Field(default=384)


class VectorDatabaseSettings(BaseModel):
    """Settings for vector database configuration."""

    name: str = Field(default="chattr")
    url: HttpUrl = HttpUrl("http://localhost:6333")


class MCPSettings(BaseModel):
    """Settings for MCP configuration."""

    path: FilePath = Field(default_factory=lambda: Path.cwd() / "mcp.json")

    @model_validator(mode="after")
    def is_valid(self) -> Self:
        """Validate that the MCP config file is a valid JSON file."""
        if self.path:
            if self.path.suffix != ".json":
                msg = "MCP config file must be a JSON file"
                raise ValueError(msg)
            if self.path.stem != "mcp":
                msg = "MCP config file must be named 'mcp.json'"
                raise ValueError(msg)
        return self

    @model_validator(mode="after")
    def is_valid_scheme(self) -> Self:
        """Validate that the MCP config file has a valid scheme."""
        if self.path and self.path.exists():
            _ = MCPScheme.model_validate_json(self.path.read_text())
        return self


class DirectorySettings(BaseModel):
    """Settings for application directories."""

    base: DirectoryPath = Field(default_factory=Path.cwd, frozen=True)

    @computed_field
    @property
    def assets(self) -> DirectoryPath:
        """Path to the assets directory."""
        return self.base / "assets"

    @computed_field
    @property
    def audio(self) -> DirectoryPath:
        """Path to the audio directory."""
        return self.assets / "audio"

    @computed_field
    @property
    def video(self) -> DirectoryPath:
        """Path to the video directory."""
        return self.assets / "video"

    @computed_field
    @property
    def prompts(self) -> DirectoryPath:
        """Path to the prompts directory."""
        return self.assets / "prompts"

    @model_validator(mode="after")
    def create_missing_dirs(self) -> Self:
        """
        Ensure that all specified directories exist, creating them if necessary.

        Checks and creates any missing directories defined in the `DirectorySettings`.

        Returns:
            Self: The validated DirectorySettings instance.
        """
        for directory in [self.base, self.assets, self.audio, self.video, self.prompts]:
            if not directory.exists():
                try:
                    directory.mkdir(parents=True, exist_ok=True)
                    log_info(f"Created directory {directory}.")
                except OSError as e:
                    log_error(f"Error creating directory {directory}: {e}")
                    raise
        return self


class ModelSettings(BaseModel):
    """Settings related to model execution."""

    url: HttpUrl | None = Field(default=None)
    name: str | None = Field(default=None)
    api_key: SecretStr | None = Field(default=None)
    temperature: float = Field(default=0.0, ge=0.0, le=1.0)
    cache_response: bool = Field(default=True)

    @model_validator(mode="after")
    def check_param_exist(self) -> Self:
        """Validate the existence of required credentials for the model provider."""
        if self.url:
            if not self.api_key or not self.api_key.get_secret_value():
                _msg: str = (
                    "You need to provide API Key for the Model provider: Set via `MODEL__API_KEY`"
                )
                raise ValueError(_msg)
            if not self.name:
                _msg: str = (
                    "You need to provide Model name for the Model provider: Set via `MODEL__NAME`"
                )
                raise ValueError(_msg)
        return self


class CharacterSettings(BaseModel):
    """Settings related to character configuration."""

    name: str | None = Field(default=None)


class LogLevel(Enum):
    """Logging levels."""

    CRITICAL = CRITICAL
    ERROR = ERROR
    WARNING = WARNING
    INFO = INFO
    DEBUG = DEBUG
    NOTSET = NOTSET


class LoggerSettings(BaseModel):
    """Settings related to logger configuration."""

    name: str = Field(default="chattr", frozen=True)
    level: LogLevel = Field(default=LogLevel.INFO)
    propagate: bool = Field(default=False)
    format: str = Field(default="%(name)s | %(process)d | %(message)s")


class Settings(BaseSettings):
    """Configuration for the Chattr app."""

    model_config = SettingsConfigDict(
        env_nested_delimiter="__",
        env_parse_none_str="None",
        env_file=".env",
        extra="ignore",
    )

    directory: DirectorySettings = Field(default_factory=DirectorySettings, frozen=True)
    model: ModelSettings = Field(default_factory=ModelSettings)
    memory: MemorySettings = Field(default_factory=MemorySettings)
    vector_database: VectorDatabaseSettings = Field(
        default_factory=VectorDatabaseSettings,
    )
    mcp: MCPSettings = Field(default_factory=MCPSettings)
    character: CharacterSettings = Field(default_factory=CharacterSettings)
    log: LoggerSettings = Field(default_factory=LoggerSettings)
    debug: bool = Field(default=False)
    timezone: str = Field(default="Africa/Cairo")


if __name__ == "__main__":
    from rich import print as rprint

    rprint(Settings().model_dump_json(indent=4))