"""initial: users + user_skills

階段 1 的初始 migration:建立 users 和 user_skills 兩張表。

未來新增資料表的流程:
  1. 在 app/models/ 加新檔案,定義 Model
  2. 在 app/models/__init__.py import 它
  3. 跑 `docker compose exec api alembic revision --autogenerate -m "描述"`
  4. 檢查產生的 migration 檔有沒有怪東西
  5. 跑 `docker compose exec api alembic upgrade head`

Revision ID: 0001_initial_users
Revises:
Create Date: 2026-05-04
"""

from typing import Sequence, Union

import sqlalchemy as sa
from alembic import op
from sqlalchemy.dialects import postgresql


# revision identifiers, used by Alembic.
revision: str = "0001_initial_users"
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:
    # ---------- users ----------
    op.create_table(
        "users",
        sa.Column(
            "id",
            postgresql.UUID(as_uuid=True),
            primary_key=True,
            nullable=False,
        ),
        sa.Column("email", sa.String(length=255), nullable=False, unique=True),
        sa.Column("password_hash", sa.String(length=255), nullable=False),
        sa.Column("display_name", sa.String(length=100), nullable=False),
        sa.Column("avatar_url", sa.String(length=500), nullable=True),
        sa.Column("role", sa.String(length=20), nullable=False, server_default="member"),
        sa.Column("is_active", sa.Boolean(), nullable=False, server_default=sa.text("true")),
        sa.Column(
            "created_at",
            sa.DateTime(timezone=True),
            server_default=sa.text("now()"),
            nullable=False,
        ),
        sa.Column(
            "updated_at",
            sa.DateTime(timezone=True),
            server_default=sa.text("now()"),
            nullable=False,
        ),
        sa.Column("deleted_at", sa.DateTime(timezone=True), nullable=True),
    )
    op.create_index("ix_users_email", "users", ["email"], unique=True)
    op.create_index("ix_users_deleted_at", "users", ["deleted_at"], unique=False)

    # ---------- user_skills ----------
    op.create_table(
        "user_skills",
        sa.Column("id", postgresql.UUID(as_uuid=True), primary_key=True, nullable=False),
        sa.Column(
            "user_id",
            postgresql.UUID(as_uuid=True),
            sa.ForeignKey("users.id", ondelete="CASCADE"),
            nullable=False,
        ),
        sa.Column("skill_name", sa.String(length=100), nullable=False),
        sa.Column("proficiency", sa.Integer(), nullable=False, server_default="3"),
        sa.Column(
            "created_at",
            sa.DateTime(timezone=True),
            server_default=sa.text("now()"),
            nullable=False,
        ),
        sa.Column(
            "updated_at",
            sa.DateTime(timezone=True),
            server_default=sa.text("now()"),
            nullable=False,
        ),
        sa.Column("deleted_at", sa.DateTime(timezone=True), nullable=True),
    )
    op.create_index("ix_user_skills_user_id", "user_skills", ["user_id"], unique=False)
    op.create_index("ix_user_skills_deleted_at", "user_skills", ["deleted_at"], unique=False)
    op.create_index(
        "ux_user_skill_unique",
        "user_skills",
        ["user_id", "skill_name"],
        unique=True,
    )


def downgrade() -> None:
    op.drop_index("ux_user_skill_unique", table_name="user_skills")
    op.drop_index("ix_user_skills_deleted_at", table_name="user_skills")
    op.drop_index("ix_user_skills_user_id", table_name="user_skills")
    op.drop_table("user_skills")

    op.drop_index("ix_users_deleted_at", table_name="users")
    op.drop_index("ix_users_email", table_name="users")
    op.drop_table("users")