"""
User and authentication models.
"""
import uuid
from datetime import datetime
from enum import Enum

from sqlalchemy import Boolean, DateTime, String, Text, func
from sqlalchemy.dialects.postgresql import JSONB, UUID
from sqlalchemy.orm import Mapped, mapped_column, relationship

from app.core.database import Base


class AuthProvider(str, Enum):
    LOCAL = "local"
    GOOGLE = "google"
    GITHUB = "github"


class UserRole(str, Enum):
    CANDIDATE = "candidate"
    EMPLOYER = "employer"
    ADMIN = "admin"


class User(Base):
    __tablename__ = "users"

    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    email: Mapped[str] = mapped_column(String(320), unique=True, index=True, nullable=False)
    hashed_password: Mapped[str | None] = mapped_column(String(256), nullable=True)
    full_name: Mapped[str] = mapped_column(String(256), nullable=False)
    avatar_url: Mapped[str | None] = mapped_column(String(512), nullable=True)
    role: Mapped[str] = mapped_column(String(20), default=UserRole.CANDIDATE, nullable=False)
    auth_provider: Mapped[str] = mapped_column(String(20), default=AuthProvider.LOCAL, nullable=False)
    auth_provider_id: Mapped[str | None] = mapped_column(String(256), nullable=True)
    is_active: Mapped[bool] = mapped_column(Boolean, default=True)
    is_verified: Mapped[bool] = mapped_column(Boolean, default=False)
    is_superuser: Mapped[bool] = mapped_column(Boolean, default=False)
    llm_preferences: Mapped[dict | None] = mapped_column(JSONB, nullable=True)
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())
    updated_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now(), onupdate=func.now())
    last_login_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)

    profile: Mapped["Profile"] = relationship(back_populates="user", uselist=False)
    applications: Mapped[list["Application"]] = relationship(back_populates="user")
    resume_versions: Mapped[list["ResumeVersion"]] = relationship(back_populates="user")
    saved_jobs: Mapped[list["SavedJob"]] = relationship(back_populates="user")
    api_keys: Mapped[list["UserAPIKey"]] = relationship(back_populates="user")


class UserAPIKey(Base):
    """Encrypted API keys for LLM providers. key_prefix/key_last4 stored for display without decryption."""
    __tablename__ = "user_api_keys"

    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    user_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), nullable=False, index=True)
    provider: Mapped[str] = mapped_column(String(50), nullable=False)
    encrypted_key: Mapped[str] = mapped_column(Text, nullable=False)
    key_prefix: Mapped[str | None] = mapped_column(String(8), nullable=True)  # e.g., "sk-p"
    key_last4: Mapped[str | None] = mapped_column(String(8), nullable=True)   # e.g., "ab4f"
    label: Mapped[str | None] = mapped_column(String(100), nullable=True)
    is_active: Mapped[bool] = mapped_column(Boolean, default=True)
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())

    user: Mapped["User"] = relationship(back_populates="api_keys")


class Profile(Base):
    __tablename__ = "profiles"

    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    user_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), unique=True, nullable=False)
    phone: Mapped[str | None] = mapped_column(String(30), nullable=True)
    location: Mapped[str | None] = mapped_column(String(200), nullable=True)
    linkedin_url: Mapped[str | None] = mapped_column(String(512), nullable=True)
    github_url: Mapped[str | None] = mapped_column(String(512), nullable=True)
    portfolio_url: Mapped[str | None] = mapped_column(String(512), nullable=True)
    website_url: Mapped[str | None] = mapped_column(String(512), nullable=True)
    headline: Mapped[str | None] = mapped_column(String(256), nullable=True)
    summary: Mapped[str | None] = mapped_column(Text, nullable=True)
    experience: Mapped[list | None] = mapped_column(JSONB, nullable=True)
    education: Mapped[list | None] = mapped_column(JSONB, nullable=True)
    skills: Mapped[list | None] = mapped_column(JSONB, nullable=True)
    certifications: Mapped[list | None] = mapped_column(JSONB, nullable=True)
    projects: Mapped[list | None] = mapped_column(JSONB, nullable=True)
    languages: Mapped[list | None] = mapped_column(JSONB, nullable=True)
    desired_roles: Mapped[list | None] = mapped_column(JSONB, nullable=True)
    desired_locations: Mapped[list | None] = mapped_column(JSONB, nullable=True)
    remote_preference: Mapped[str | None] = mapped_column(String(20), nullable=True)
    salary_min: Mapped[int | None] = mapped_column(nullable=True)
    salary_max: Mapped[int | None] = mapped_column(nullable=True)
    salary_currency: Mapped[str | None] = mapped_column(String(3), nullable=True)
    visa_required: Mapped[bool | None] = mapped_column(Boolean, nullable=True)
    open_to_work: Mapped[bool] = mapped_column(Boolean, default=False)
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())
    updated_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now(), onupdate=func.now())

    user: Mapped["User"] = relationship(back_populates="profile")