"""API Push 短新闻来源

新增字段:
- articles.is_short_news     BOOL    NOT NULL DEFAULT false  (索引)
- articles.external_id       VARCHAR(128)  nullable           (索引)
- articles.source_ref        VARCHAR(64)   nullable           (索引)
- articles.content_hash      VARCHAR(40)   nullable UNIQUE    (索引,内容去重核心 key)
- articles.url               TEXT          nullable           (放宽 — 短新闻可合成 url)
- sources.kind               ENUM 加 'api_push' 值
- api_tokens.purpose         VARCHAR(16) NOT NULL DEFAULT 'mobile' (索引)
                              值域: mobile / ingest
- api_tokens.source_id       INTEGER NULL FK sources.id ON DELETE CASCADE (索引,
                              ingest token 绑定的 source)

Revision ID: 0008
Revises: 0007
Create Date: 2026-06-14
"""
from __future__ import annotations

from typing import Sequence, Union

import sqlalchemy as sa
from alembic import op


revision: str = "0008"
down_revision: Union[str, None] = "0007"
branch_labels = None
depends_on = None


def upgrade() -> None:
    # === 1) sources.kind 加 'api_push' ===
    # PG enum 加 value 必须用 ALTER TYPE,alembic 没有原生 op,直接 execute
    op.execute("ALTER TYPE source_kind ADD VALUE IF NOT EXISTS 'api_push'")

    # === 2) articles:5 个字段 ===
    # 2.1) is_short_news
    op.add_column(
        "articles",
        sa.Column(
            "is_short_news",
            sa.Boolean,
            nullable=False,
            server_default=sa.text("false"),
        ),
    )
    op.create_index("ix_articles_is_short_news", "articles", ["is_short_news"])

    # 2.2) external_id
    op.add_column(
        "articles",
        sa.Column("external_id", sa.String(128), nullable=True),
    )
    op.create_index("ix_articles_external_id", "articles", ["external_id"])

    # 2.3) source_ref
    op.add_column(
        "articles",
        sa.Column("source_ref", sa.String(64), nullable=True),
    )
    op.create_index("ix_articles_source_ref", "articles", ["source_ref"])

    # 2.4) content_hash (UNIQUE,核心去重 key)
    op.add_column(
        "articles",
        sa.Column("content_hash", sa.String(40), nullable=True),
    )
    op.create_index("ix_articles_content_hash", "articles", ["content_hash"], unique=True)

    # 注:articles.url 保持 NOT NULL。短新闻入库时会合成 "api-push://source-slug/content-hash"
    # 作为占位,避免改动下游 schema(ArticleDetail.url 等)引出更大爆炸半径。

    # === 3) api_tokens.purpose + source_id ===
    op.add_column(
        "api_tokens",
        sa.Column(
            "purpose",
            sa.String(16),
            nullable=False,
            server_default="mobile",
        ),
    )
    op.create_index("ix_api_tokens_purpose", "api_tokens", ["purpose"])
    op.add_column(
        "api_tokens",
        sa.Column(
            "source_id",
            sa.Integer,
            sa.ForeignKey("sources.id", ondelete="CASCADE"),
            nullable=True,
        ),
    )
    op.create_index("ix_api_tokens_source_id", "api_tokens", ["source_id"])


def downgrade() -> None:
    # === 反向顺序 ===
    op.drop_index("ix_api_tokens_source_id", table_name="api_tokens")
    op.drop_column("api_tokens", "source_id")
    op.drop_index("ix_api_tokens_purpose", table_name="api_tokens")
    op.drop_column("api_tokens", "purpose")

    op.drop_index("ix_articles_content_hash", table_name="articles")
    op.drop_column("articles", "content_hash")
    op.drop_index("ix_articles_source_ref", table_name="articles")
    op.drop_column("articles", "source_ref")
    op.drop_index("ix_articles_external_id", table_name="articles")
    op.drop_column("articles", "external_id")
    op.drop_index("ix_articles_is_short_news", table_name="articles")
    op.drop_column("articles", "is_short_news")

    # PG enum remove value 没有原生支持,需要重建类型。
    # 这里只保留注释,提醒运维:downgrade 后如需去掉 api_push enum 值,
    # 需手工 ALTER TYPE (CREATE TYPE ... + ALTER COLUMN + DROP TYPE)。