# app/schemas/organizations.py
import re
from datetime import datetime
from typing import Optional, Dict, Any, List
from uuid import UUID

from pydantic import BaseModel, field_validator, ConfigDict, Field

from app.models.user_organization import OrganizationRole


# Organization Schemas
class OrganizationBase(BaseModel):
    """Base organization schema with common fields."""
    name: str = Field(..., min_length=1, max_length=255)
    slug: Optional[str] = Field(None, min_length=1, max_length=255)
    description: Optional[str] = None
    is_active: bool = True
    settings: Optional[Dict[str, Any]] = {}

    @field_validator('slug')
    @classmethod
    def validate_slug(cls, v: Optional[str]) -> Optional[str]:
        """Validate slug format: lowercase, alphanumeric, hyphens only."""
        if v is None:
            return v
        if not re.match(r'^[a-z0-9-]+$', v):
            raise ValueError('Slug must contain only lowercase letters, numbers, and hyphens')
        if v.startswith('-') or v.endswith('-'):
            raise ValueError('Slug cannot start or end with a hyphen')
        if '--' in v:
            raise ValueError('Slug cannot contain consecutive hyphens')
        return v

    @field_validator('name')
    @classmethod
    def validate_name(cls, v: str) -> str:
        """Validate organization name."""
        if not v or v.strip() == "":
            raise ValueError('Organization name cannot be empty')
        return v.strip()


class OrganizationCreate(OrganizationBase):
    """Schema for creating a new organization."""
    name: str = Field(..., min_length=1, max_length=255)
    slug: str = Field(..., min_length=1, max_length=255)


class OrganizationUpdate(BaseModel):
    """Schema for updating an organization."""
    name: Optional[str] = Field(None, min_length=1, max_length=255)
    slug: Optional[str] = Field(None, min_length=1, max_length=255)
    description: Optional[str] = None
    is_active: Optional[bool] = None
    settings: Optional[Dict[str, Any]] = None

    @field_validator('slug')
    @classmethod
    def validate_slug(cls, v: Optional[str]) -> Optional[str]:
        """Validate slug format."""
        if v is None:
            return v
        if not re.match(r'^[a-z0-9-]+$', v):
            raise ValueError('Slug must contain only lowercase letters, numbers, and hyphens')
        if v.startswith('-') or v.endswith('-'):
            raise ValueError('Slug cannot start or end with a hyphen')
        if '--' in v:
            raise ValueError('Slug cannot contain consecutive hyphens')
        return v

    @field_validator('name')
    @classmethod
    def validate_name(cls, v: Optional[str]) -> Optional[str]:
        """Validate organization name."""
        if v is not None and (not v or v.strip() == ""):
            raise ValueError('Organization name cannot be empty')
        return v.strip() if v else v


class OrganizationResponse(OrganizationBase):
    """Schema for organization API responses."""
    id: UUID
    created_at: datetime
    updated_at: Optional[datetime] = None
    member_count: Optional[int] = 0

    model_config = ConfigDict(from_attributes=True)


class OrganizationListResponse(BaseModel):
    """Schema for paginated organization list responses."""
    organizations: List[OrganizationResponse]
    total: int
    page: int
    page_size: int
    pages: int


# User-Organization Relationship Schemas
class UserOrganizationBase(BaseModel):
    """Base schema for user-organization relationship."""
    role: OrganizationRole = OrganizationRole.MEMBER
    is_active: bool = True
    custom_permissions: Optional[str] = None


class UserOrganizationCreate(BaseModel):
    """Schema for adding a user to an organization."""
    user_id: UUID
    role: OrganizationRole = OrganizationRole.MEMBER
    custom_permissions: Optional[str] = None


class UserOrganizationUpdate(BaseModel):
    """Schema for updating user's role in an organization."""
    role: Optional[OrganizationRole] = None
    is_active: Optional[bool] = None
    custom_permissions: Optional[str] = None


class UserOrganizationResponse(BaseModel):
    """Schema for user-organization relationship responses."""
    user_id: UUID
    organization_id: UUID
    role: OrganizationRole
    is_active: bool
    custom_permissions: Optional[str] = None
    created_at: datetime
    updated_at: Optional[datetime] = None

    model_config = ConfigDict(from_attributes=True)


class OrganizationMemberResponse(BaseModel):
    """Schema for organization member information."""
    user_id: UUID
    email: str
    first_name: str
    last_name: Optional[str] = None
    role: OrganizationRole
    is_active: bool
    joined_at: datetime

    model_config = ConfigDict(from_attributes=True)


class OrganizationMemberListResponse(BaseModel):
    """Schema for paginated organization member list."""
    members: List[OrganizationMemberResponse]
    total: int
    page: int
    page_size: int
    pages: int