"""init database with SQLite Block storage

Revision ID: 001_init_database
Revises:
Create Date: 2026-07-03

初始化数据库，包含 SQLite Block 存储方案的表结构
"""

from alembic import op
import sqlalchemy as sa

revision = "001_init_database"
down_revision = None
branch_labels = None
depends_on = None


def upgrade() -> None:
    # ========== documents 表 ==========
    op.create_table(
        "documents",
        sa.Column("id", sa.String(64), primary_key=True),
        sa.Column("content_db_path", sa.String(1024), nullable=False),
        sa.Column("session_id", sa.String(128), nullable=True),
        sa.Column("created_by", sa.String(128), 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(),
            onupdate=sa.func.now(),
            nullable=False,
        ),
    )
    op.create_index("ix_documents_session_id", "documents", ["session_id"])
    op.create_index("ix_documents_created_by", "documents", ["created_by"])

    # ========== export_records 表 ==========
    op.create_table(
        "export_records",
        sa.Column("id", sa.String(64), primary_key=True),
        sa.Column("user_id", sa.String(128), nullable=False),
        sa.Column("file_name", sa.String(512), nullable=False),
        sa.Column("file_path", sa.String(1024), nullable=False),
        sa.Column("file_size", sa.BigInteger(), nullable=False, server_default="0"),
        sa.Column("download_url", sa.String(1024), nullable=False),
        sa.Column("document_id", sa.String(64), nullable=True),
        sa.Column("style_id", sa.String(64), nullable=False, server_default="default"),
        sa.Column(
            "created_at",
            sa.DateTime(timezone=True),
            server_default=sa.func.now(),
            nullable=False,
        ),
    )
    op.create_index("ix_export_records_user_id", "export_records", ["user_id"])
    op.create_index("ix_export_records_document_id", "export_records", ["document_id"])


def downgrade() -> None:
    # 删除 export_records 表
    op.drop_index("ix_export_records_document_id", table_name="export_records")
    op.drop_index("ix_export_records_user_id", table_name="export_records")
    op.drop_table("export_records")
    
    # 删除 documents 表
    op.drop_index("ix_documents_created_by", table_name="documents")
    op.drop_index("ix_documents_session_id", table_name="documents")
    op.drop_table("documents")