"""Начальная схема базы данных.

Revision ID: 001
Revises:
Create Date: 2024-01-01 00:00:00.000000

Создаёт таблицы: users, tasks, documents, fingerprints, usage_logs
"""

from alembic import op
import sqlalchemy as sa

# revision identifiers
revision = "001"
down_revision = None
branch_labels = None
depends_on = None


def upgrade() -> None:
    """Создать все таблицы."""

    # ── users ──────────────────────────────────────────────────────────────────
    op.create_table(
        "users",
        sa.Column("id", sa.Integer(), primary_key=True, autoincrement=True),
        sa.Column("email", sa.String(255), nullable=False),
        sa.Column("hashed_password", sa.String(255), nullable=False),
        sa.Column("name", sa.String(255), nullable=False),
        sa.Column("is_verified", sa.Boolean(), nullable=False, server_default="false"),
        sa.Column("plan", sa.String(20), nullable=False, server_default="free"),
        sa.Column("verification_token", sa.String(255), nullable=True),
        sa.Column("created_at", sa.DateTime(timezone=True), server_default=sa.func.now()),
        sa.Column("updated_at", sa.DateTime(timezone=True), server_default=sa.func.now()),
    )
    op.create_index("ix_users_email", "users", ["email"], unique=True)

    # ── tasks ──────────────────────────────────────────────────────────────────
    op.create_table(
        "tasks",
        sa.Column("id", sa.String(36), primary_key=True),
        sa.Column("user_id", sa.Integer(), sa.ForeignKey("users.id", ondelete="CASCADE")),
        sa.Column("type", sa.String(20), nullable=False),
        sa.Column("status", sa.String(20), nullable=False, server_default="queued"),
        sa.Column("celery_task_id", sa.String(255), nullable=True),
        sa.Column("input_data", sa.JSON(), nullable=False, server_default="{}"),
        sa.Column("result", sa.JSON(), nullable=True),
        sa.Column("error", sa.Text(), nullable=True),
        sa.Column("queue_position", sa.Integer(), nullable=True),
        sa.Column("created_at", sa.DateTime(timezone=True), server_default=sa.func.now()),
        sa.Column("updated_at", sa.DateTime(timezone=True), nullable=True),
    )
    op.create_index("ix_tasks_user_id", "tasks", ["user_id"])
    op.create_index("ix_tasks_status", "tasks", ["status"])

    # ── documents ──────────────────────────────────────────────────────────────
    op.create_table(
        "documents",
        sa.Column("id", sa.Integer(), primary_key=True, autoincrement=True),
        sa.Column("source", sa.String(50), nullable=False),
        sa.Column("ext_id", sa.String(255), nullable=False),
        sa.Column("doi", sa.String(255), nullable=True),
        sa.Column("title", sa.Text(), nullable=False),
        sa.Column("authors", sa.JSON(), nullable=False, server_default="[]"),
        sa.Column("year", sa.Integer(), nullable=True),
        sa.Column("lang", sa.String(10), nullable=True),
        sa.Column("journal", sa.Text(), nullable=True),
        sa.Column("volume", sa.String(50), nullable=True),
        sa.Column("issue", sa.String(50), nullable=True),
        sa.Column("pages", sa.String(50), nullable=True),
        sa.Column("abstract", sa.Text(), nullable=True),
        sa.Column("url", sa.Text(), nullable=True),
        sa.Column("minio_key", sa.Text(), nullable=True),
        sa.Column("faiss_id", sa.Integer(), nullable=True),
        sa.Column("indexed_at", sa.DateTime(timezone=True), server_default=sa.func.now()),
    )
    op.create_index("ix_documents_ext_id", "documents", ["ext_id"], unique=True)
    op.create_index("ix_documents_doi", "documents", ["doi"])
    op.create_index("ix_documents_source", "documents", ["source"])
    op.create_index("ix_documents_year", "documents", ["year"])
    op.create_index("ix_documents_lang", "documents", ["lang"])
    op.create_index("ix_documents_faiss_id", "documents", ["faiss_id"])

    # ── fingerprints ───────────────────────────────────────────────────────────
    op.create_table(
        "fingerprints",
        sa.Column("id", sa.Integer(), primary_key=True, autoincrement=True),
        sa.Column("doc_id", sa.Integer(), sa.ForeignKey("documents.id", ondelete="CASCADE")),
        sa.Column("hash_value", sa.BigInteger(), nullable=False),
        sa.Column("position", sa.Integer(), nullable=False),
    )
    op.create_index("ix_fingerprints_doc_id", "fingerprints", ["doc_id"])
    op.create_index("ix_fingerprints_hash_value", "fingerprints", ["hash_value"])

    # ── usage_logs ─────────────────────────────────────────────────────────────
    op.create_table(
        "usage_logs",
        sa.Column("id", sa.Integer(), primary_key=True, autoincrement=True),
        sa.Column("user_id", sa.Integer(), sa.ForeignKey("users.id", ondelete="CASCADE")),
        sa.Column("action", sa.String(50), nullable=False),
        sa.Column("created_at", sa.DateTime(timezone=True), server_default=sa.func.now()),
    )
    op.create_index("ix_usage_logs_user_id", "usage_logs", ["user_id"])
    op.create_index("ix_usage_logs_created_at", "usage_logs", ["created_at"])


def downgrade() -> None:
    """Удалить все таблицы."""
    op.drop_table("usage_logs")
    op.drop_table("fingerprints")
    op.drop_table("documents")
    op.drop_table("tasks")
    op.drop_table("users")