"""initial schema: users, access_tokens, lessons, student_progress

Revision ID: 0001
Revises:
Create Date: 2026-08-05
"""

from alembic import op
import sqlalchemy as sa

revision = "0001"
down_revision = None
branch_labels = None
depends_on = None


def upgrade() -> None:
    op.create_table(
        "users",
        sa.Column("id", sa.String(36), primary_key=True),
        sa.Column("display_name", sa.String(255), nullable=False),
        sa.Column("role", sa.String(10), nullable=False),
        sa.Column("is_active", sa.Boolean(), nullable=False, server_default=sa.true()),
        sa.Column(
            "created_at",
            sa.DateTime(timezone=True),
            nullable=False,
            server_default=sa.func.now(),
        ),
        sa.Column(
            "updated_at",
            sa.DateTime(timezone=True),
            nullable=False,
            server_default=sa.func.now(),
        ),
        sa.CheckConstraint("role IN ('teacher','student')", name="ck_users_role"),
    )
    op.create_table(
        "access_tokens",
        sa.Column("id", sa.String(36), primary_key=True),
        sa.Column("token_hash", sa.String(64), nullable=False),
        sa.Column(
            "user_id",
            sa.String(36),
            sa.ForeignKey("users.id", ondelete="CASCADE"),
            nullable=False,
        ),
        sa.Column("revoked_at", sa.DateTime(timezone=True), nullable=True),
        sa.Column("last_used_at", sa.DateTime(timezone=True), nullable=True),
        sa.Column(
            "created_at",
            sa.DateTime(timezone=True),
            nullable=False,
            server_default=sa.func.now(),
        ),
        sa.UniqueConstraint("token_hash", name="uq_access_tokens_token_hash"),
    )
    op.create_index("ix_access_tokens_token_hash", "access_tokens", ["token_hash"])
    op.create_index("ix_access_tokens_user_id", "access_tokens", ["user_id"])
    op.create_table(
        "lessons",
        sa.Column("id", sa.String(36), primary_key=True),
        sa.Column("slug", sa.String(255), nullable=False),
        sa.Column("title", sa.String(255), nullable=False),
        sa.Column("order_index", sa.Integer(), nullable=False, server_default="0"),
        sa.Column("is_active", sa.Boolean(), nullable=False, server_default=sa.true()),
        sa.Column(
            "created_at",
            sa.DateTime(timezone=True),
            nullable=False,
            server_default=sa.func.now(),
        ),
        sa.Column(
            "updated_at",
            sa.DateTime(timezone=True),
            nullable=False,
            server_default=sa.func.now(),
        ),
        sa.UniqueConstraint("slug", name="uq_lessons_slug"),
    )
    op.create_index("ix_lessons_slug", "lessons", ["slug"])
    op.create_table(
        "student_progress",
        sa.Column("id", sa.String(36), primary_key=True),
        sa.Column(
            "user_id",
            sa.String(36),
            sa.ForeignKey("users.id", ondelete="CASCADE"),
            nullable=False,
        ),
        sa.Column(
            "lesson_id",
            sa.String(36),
            sa.ForeignKey("lessons.id", ondelete="CASCADE"),
            nullable=False,
        ),
        sa.Column("state", sa.String(20), nullable=False, server_default="not_started"),
        sa.Column("score_earned", sa.Integer(), nullable=True),
        sa.Column("score_total", sa.Integer(), nullable=True),
        sa.Column(
            "updated_at",
            sa.DateTime(timezone=True),
            nullable=False,
            server_default=sa.func.now(),
        ),
        sa.CheckConstraint(
            "state IN ('not_started','completed','scored')", name="ck_student_progress_state"
        ),
        sa.UniqueConstraint("user_id", "lesson_id", name="uq_student_progress_user_lesson"),
    )
    op.create_index("ix_student_progress_user_id", "student_progress", ["user_id"])


def downgrade() -> None:
    op.drop_table("student_progress")
    op.drop_table("lessons")
    op.drop_table("access_tokens")
    op.drop_table("users")