"""initial schema — images, tags, image_tags

Revision ID: 001
Revises:
Create Date: 2026-05-02

"""
from typing import Sequence, Union
import sqlalchemy as sa
from sqlalchemy.dialects import postgresql
from alembic import op

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


def upgrade() -> None:
    op.create_table(
        "images",
        sa.Column("id", postgresql.UUID(as_uuid=True), nullable=False),
        sa.Column("hash", sa.String(64), nullable=False),
        sa.Column("filename", sa.String(), nullable=False),
        sa.Column("mime_type", sa.String(20), nullable=False),
        sa.Column("size_bytes", sa.BigInteger(), nullable=False),
        sa.Column("width", sa.Integer(), nullable=False),
        sa.Column("height", sa.Integer(), nullable=False),
        sa.Column("storage_key", sa.String(64), nullable=False),
        sa.Column("created_at", sa.DateTime(timezone=True), nullable=False),
        sa.PrimaryKeyConstraint("id"),
        sa.UniqueConstraint("hash", name="uq_images_hash"),
    )
    op.create_index("ix_images_hash", "images", ["hash"])

    op.create_table(
        "tags",
        sa.Column("id", postgresql.UUID(as_uuid=True), nullable=False),
        sa.Column("name", sa.String(64), nullable=False),
        sa.Column("created_at", sa.DateTime(timezone=True), nullable=False),
        sa.PrimaryKeyConstraint("id"),
        sa.UniqueConstraint("name", name="uq_tags_name"),
    )
    op.create_index("ix_tags_name", "tags", ["name"])
    op.create_index("ix_tags_name_prefix", "tags", ["name"], postgresql_ops={"name": "varchar_pattern_ops"})

    op.create_table(
        "image_tags",
        sa.Column("image_id", postgresql.UUID(as_uuid=True), nullable=False),
        sa.Column("tag_id", postgresql.UUID(as_uuid=True), nullable=False),
        sa.ForeignKeyConstraint(["image_id"], ["images.id"], ondelete="CASCADE"),
        sa.ForeignKeyConstraint(["tag_id"], ["tags.id"], ondelete="RESTRICT"),
        sa.PrimaryKeyConstraint("image_id", "tag_id"),
        sa.UniqueConstraint("image_id", "tag_id", name="uq_image_tag"),
    )
    op.create_index("ix_image_tags_image_id", "image_tags", ["image_id"])
    op.create_index("ix_image_tags_tag_id", "image_tags", ["tag_id"])


def downgrade() -> None:
    op.drop_table("image_tags")
    op.drop_table("tags")
    op.drop_table("images")