import uuid
from datetime import datetime

from sqlalchemy import String, Integer, DateTime, ForeignKey, Index, func, Text
from sqlalchemy import Uuid
from sqlalchemy.orm import Mapped, mapped_column, relationship

from app.database import Base, JSONType


class Content(Base):
    __tablename__ = "contents"

    id: Mapped[uuid.UUID] = mapped_column(
        Uuid(as_uuid=True),
        primary_key=True,
        default=uuid.uuid4,
    )
    organization_id: Mapped[uuid.UUID] = mapped_column(
        Uuid(as_uuid=True),
        ForeignKey("organizations.id", ondelete="CASCADE"),
        nullable=False,
    )
    project_id: Mapped[uuid.UUID | None] = mapped_column(
        Uuid(as_uuid=True),
        ForeignKey("lifecycle_projects.id", ondelete="SET NULL"),
        nullable=True,
    )
    title: Mapped[str] = mapped_column(String(500), nullable=False)
    content_type: Mapped[str] = mapped_column(String(50), nullable=False)
    body: Mapped[str | None] = mapped_column(Text, nullable=True)
    status: Mapped[str] = mapped_column(String(20), server_default="draft", nullable=False)
    target_platforms: Mapped[list | None] = mapped_column(JSONType, nullable=True)
    keywords: Mapped[list | None] = mapped_column(JSONType, nullable=True)
    extra_metadata: Mapped[dict | None] = mapped_column("metadata", JSONType, nullable=True)
    created_by: Mapped[str | None] = mapped_column(
        String(36),
        ForeignKey("users.id", ondelete="SET NULL"),
        nullable=True,
    )
    current_version: Mapped[int] = mapped_column(Integer, server_default="1", nullable=False)
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True),
        server_default=func.now(),
        nullable=False,
    )
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True),
        server_default=func.now(),
        onupdate=func.now(),
        nullable=False,
    )

    # Relationships
    organization: Mapped["Organization"] = relationship(
        "Organization", back_populates="contents"
    )
    project: Mapped["LifecycleProject | None"] = relationship(
        "LifecycleProject"
    )
    creator: Mapped["User | None"] = relationship(
        "User", foreign_keys=[created_by]
    )
    versions: Mapped[list["ContentVersion"]] = relationship(
        "ContentVersion", back_populates="content", cascade="all, delete-orphan"
    )
    reviews: Mapped[list["ContentReview"]] = relationship(
        "ContentReview", back_populates="content", cascade="all, delete-orphan"
    )

    __table_args__ = (
        Index("idx_contents_organization_id", "organization_id"),
        Index("idx_contents_project_id", "project_id"),
        Index("idx_contents_status", "status"),
        Index("idx_contents_content_type", "content_type"),
        Index("idx_contents_created_by", "created_by"),
    )


class ContentVersion(Base):
    __tablename__ = "content_versions"

    id: Mapped[uuid.UUID] = mapped_column(
        Uuid(as_uuid=True),
        primary_key=True,
        default=uuid.uuid4,
    )
    content_id: Mapped[uuid.UUID] = mapped_column(
        Uuid(as_uuid=True),
        ForeignKey("contents.id", ondelete="CASCADE"),
        nullable=False,
    )
    version_number: Mapped[int] = mapped_column(Integer, nullable=False)
    title: Mapped[str | None] = mapped_column(String(500), nullable=True)
    body: Mapped[str | None] = mapped_column(Text, nullable=True)
    change_summary: Mapped[str | None] = mapped_column(String(500), nullable=True)
    created_by: Mapped[str | None] = mapped_column(
        String(36),
        ForeignKey("users.id", ondelete="SET NULL"),
        nullable=True,
    )
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True),
        server_default=func.now(),
        nullable=False,
    )

    # Relationships
    content: Mapped["Content"] = relationship(
        "Content", back_populates="versions"
    )
    creator: Mapped["User | None"] = relationship(
        "User", foreign_keys=[created_by]
    )

    __table_args__ = (
        Index("idx_content_versions_content_id", "content_id"),
        Index("idx_content_versions_content_version", "content_id", "version_number", unique=True),
    )


class ContentReview(Base):
    __tablename__ = "content_reviews"

    id: Mapped[uuid.UUID] = mapped_column(
        Uuid(as_uuid=True),
        primary_key=True,
        default=uuid.uuid4,
    )
    content_id: Mapped[uuid.UUID] = mapped_column(
        Uuid(as_uuid=True),
        ForeignKey("contents.id", ondelete="CASCADE"),
        nullable=False,
    )
    reviewer_id: Mapped[str] = mapped_column(
        String(36),
        ForeignKey("users.id", ondelete="CASCADE"),
        nullable=False,
    )
    status: Mapped[str] = mapped_column(String(20), nullable=False)
    comments: Mapped[str | None] = mapped_column(Text, nullable=True)
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True),
        server_default=func.now(),
        nullable=False,
    )

    # Relationships
    content: Mapped["Content"] = relationship(
        "Content", back_populates="reviews"
    )
    reviewer: Mapped["User"] = relationship(
        "User", foreign_keys=[reviewer_id]
    )

    __table_args__ = (
        Index("idx_content_reviews_content_id", "content_id"),
        Index("idx_content_reviews_reviewer_id", "reviewer_id"),
    )