"""Create chats, messages, and context_files tables

Revision ID: 002
Revises: 001
Create Date: 2026-03-19

"""
from typing import Sequence, Union

from alembic import op
import sqlalchemy as sa
from sqlalchemy.dialects.postgresql import UUID, JSONB

revision: str = "002"
down_revision: Union[str, None] = "001"
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    op.create_table(
        "chats",
        sa.Column("id", UUID(as_uuid=True), primary_key=True, server_default=sa.text("gen_random_uuid()")),
        sa.Column("user_id", UUID(as_uuid=True), sa.ForeignKey("users.id", ondelete="CASCADE"), nullable=False, index=True),
        sa.Column("title", sa.String(255), nullable=False, server_default="New Chat"),
        sa.Column("skill_id", UUID(as_uuid=True), nullable=True),
        sa.Column("is_archived", sa.Boolean, nullable=False, server_default=sa.text("false")),
        sa.Column("created_at", sa.DateTime(timezone=True), server_default=sa.func.now(), nullable=False),
        sa.Column("updated_at", sa.DateTime(timezone=True), server_default=sa.func.now(), nullable=False),
    )

    op.create_table(
        "messages",
        sa.Column("id", UUID(as_uuid=True), primary_key=True, server_default=sa.text("gen_random_uuid()")),
        sa.Column("chat_id", UUID(as_uuid=True), sa.ForeignKey("chats.id", ondelete="CASCADE"), nullable=False, index=True),
        sa.Column("role", sa.String(20), nullable=False),
        sa.Column("content", sa.Text, nullable=False),
        sa.Column("metadata", JSONB, nullable=True),
        sa.Column("created_at", sa.DateTime(timezone=True), server_default=sa.func.now(), nullable=False),
    )

    op.create_table(
        "context_files",
        sa.Column("id", UUID(as_uuid=True), primary_key=True, server_default=sa.text("gen_random_uuid()")),
        sa.Column("type", sa.String(20), nullable=False),
        sa.Column("user_id", UUID(as_uuid=True), sa.ForeignKey("users.id", ondelete="CASCADE"), nullable=True),
        sa.Column("content", sa.Text, nullable=False, server_default=""),
        sa.Column("version", sa.Integer, nullable=False, server_default=sa.text("1")),
        sa.Column("updated_by", UUID(as_uuid=True), sa.ForeignKey("users.id", ondelete="SET NULL"), nullable=True),
        sa.Column("created_at", sa.DateTime(timezone=True), server_default=sa.func.now(), nullable=False),
        sa.Column("updated_at", sa.DateTime(timezone=True), server_default=sa.func.now(), nullable=False),
        sa.UniqueConstraint("type", "user_id", name="uq_context_files_type_user"),
    )


def downgrade() -> None:
    op.drop_table("context_files")
    op.drop_table("messages")
    op.drop_table("chats")