import re
from datetime import datetime, timezone
from typing import List, Optional
from pydantic import BaseModel, Field, field_validator


class PlayerCreate(BaseModel):
    name: str = Field(..., min_length=1, max_length=32, description="Display name of the player")
    color: str = Field(..., description="Hex color code (e.g. #FF5733) or valid CSS color name")

    @field_validator("name")
    @classmethod
    def validate_name(cls, v: str) -> str:
        cleaned = v.strip()
        if not cleaned:
            raise ValueError("Player name cannot be empty or only whitespace")
        return cleaned

    @field_validator("color")
    @classmethod
    def validate_color(cls, v: str) -> str:
        cleaned = v.strip()
        # Accept #RRGGBB, #RGB, or standard alphanumeric color names
        if re.match(r"^#(?:[0-9a-fA-F]{3}){1,2}$", cleaned):
            return cleaned.upper()
        if re.match(r"^[a-zA-Z]{3,20}$", cleaned):
            return cleaned.lower()
        raise ValueError("Color must be a valid hex code (e.g. #FF4444) or color name (e.g. crimson)")


class Player(BaseModel):
    id: str
    name: str
    color: str
    x: int
    y: int
    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))


class BoardConfig(BaseModel):
    min_x: int = 0
    max_x: int = 64
    min_y: int = 0
    max_y: int = 64
    grid_cells_x: int = 64
    grid_cells_y: int = 64


class BoardState(BaseModel):
    config: BoardConfig
    player_count: int
    players: List[Player]


class ApiResponse(BaseModel):
    success: bool
    message: str
    data: Optional[dict] = None