from pydantic import BaseModel, Field, computed_field, model_validator
from typing import Optional
from datetime import datetime, date
from decimal import Decimal
from enum import Enum


class SecurityLevel(str, Enum):
    PUBLIC = "public"
    DEPARTMENT = "department"
    CONFIDENTIAL = "confidential"


class ProjectBase(BaseModel):
    title: str = Field(..., min_length=1, max_length=500)
    description: Optional[str] = Field(None, max_length=10000)
    budget: Optional[Decimal] = Field(None, ge=0, le=99999999999)
    start_date: Optional[date] = None
    end_date: Optional[date] = None
    security_level: SecurityLevel = SecurityLevel.DEPARTMENT

    @model_validator(mode="before")
    @classmethod
    def apply_name_alias(cls, values):
        if isinstance(values, dict) and not values.get("title") and values.get("name"):
            values["title"] = values["name"]
        return values

    @computed_field
    @property
    def name(self) -> str:
        return self.title


class ProjectCreate(ProjectBase):
    department_id: Optional[str] = None
    template_id: Optional[str] = None


class ProjectUpdate(BaseModel):
    title: Optional[str] = Field(None, min_length=1, max_length=500)
    description: Optional[str] = Field(None, max_length=10000)
    budget: Optional[Decimal] = Field(None, ge=0, le=99999999999)
    start_date: Optional[date] = None
    end_date: Optional[date] = None
    security_level: Optional[SecurityLevel] = None
    status: Optional[str] = Field(None, max_length=50)
    department_id: Optional[str] = None

    @model_validator(mode="before")
    @classmethod
    def apply_name_alias(cls, values):
        if isinstance(values, dict) and not values.get("title") and values.get("name"):
            values["title"] = values["name"]
        return values


class ProjectResponse(ProjectBase):
    id: str
    space_id: str
    owner_id: str
    status: str
    department_id: Optional[str] = None
    created_at: datetime
    updated_at: datetime

    class Config:
        from_attributes = True


class ProjectWithDetails(ProjectResponse):
    owner_name: Optional[str] = None
    space_name: Optional[str] = None
    department_name: Optional[str] = None
    task_count: int = 0