"""Initial PostgreSQL/PostGIS schema"""

from __future__ import annotations

import sqlalchemy as sa
from alembic import op
from geoalchemy2.types import Geometry
from sqlalchemy.dialects import postgresql

# revision identifiers, used by Alembic.
revision = "20251011_01"
down_revision = None
branch_labels = None
depends_on = None


def upgrade() -> None:
    op.execute("CREATE EXTENSION IF NOT EXISTS postgis")
    op.execute("CREATE EXTENSION IF NOT EXISTS pgcrypto")

    op.create_table(
        "users",
        sa.Column("id", postgresql.UUID(as_uuid=True), primary_key=True, server_default=sa.text("gen_random_uuid()")),
        sa.Column("username", sa.String(length=64), nullable=False, unique=True),
        sa.Column("email", sa.String(length=255), nullable=True, unique=True),
        sa.Column("full_name", sa.String(length=128), nullable=True),
        sa.Column("password_hash", sa.String(length=256), nullable=False),
        sa.Column("role", sa.String(length=32), nullable=False, server_default="player"),
        sa.Column("preferences", sa.Text(), nullable=True),
        sa.Column("created_at", sa.DateTime(timezone=True), server_default=sa.text("timezone('utc', now())"), nullable=False),
        sa.Column("updated_at", sa.DateTime(timezone=True), server_default=sa.text("timezone('utc', now())"), nullable=False),
    )

    op.create_table(
        "stations",
        sa.Column("id", postgresql.UUID(as_uuid=True), primary_key=True, server_default=sa.text("gen_random_uuid()")),
        sa.Column("osm_id", sa.String(length=32), nullable=True),
        sa.Column("name", sa.String(length=128), nullable=False),
        sa.Column("code", sa.String(length=16), nullable=True),
        sa.Column("location", Geometry(geometry_type="POINT", srid=4326), nullable=False),
        sa.Column("elevation_m", sa.Float(), nullable=True),
        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("timezone('utc', now())"), nullable=False),
        sa.Column("updated_at", sa.DateTime(timezone=True), server_default=sa.text("timezone('utc', now())"), nullable=False),
    )
    op.create_index("ix_stations_location", "stations", ["location"], postgresql_using="gist")

    op.create_table(
        "tracks",
        sa.Column("id", postgresql.UUID(as_uuid=True), primary_key=True, server_default=sa.text("gen_random_uuid()")),
        sa.Column("name", sa.String(length=128), nullable=True),
        sa.Column("start_station_id", postgresql.UUID(as_uuid=True), nullable=False),
        sa.Column("end_station_id", postgresql.UUID(as_uuid=True), nullable=False),
        sa.Column("length_meters", sa.Numeric(10, 2), nullable=True),
        sa.Column("max_speed_kph", sa.Integer(), nullable=True),
        sa.Column("is_bidirectional", sa.Boolean(), nullable=False, server_default=sa.text("true")),
        sa.Column("status", sa.String(length=32), nullable=False, server_default="planned"),
        sa.Column("track_geometry", Geometry(geometry_type="LINESTRING", srid=4326), nullable=False),
        sa.Column("created_at", sa.DateTime(timezone=True), server_default=sa.text("timezone('utc', now())"), nullable=False),
        sa.Column("updated_at", sa.DateTime(timezone=True), server_default=sa.text("timezone('utc', now())"), nullable=False),
        sa.ForeignKeyConstraint(["start_station_id"], ["stations.id"], ondelete="RESTRICT"),
        sa.ForeignKeyConstraint(["end_station_id"], ["stations.id"], ondelete="RESTRICT"),
        sa.UniqueConstraint("start_station_id", "end_station_id", name="uq_tracks_station_pair"),
    )
    op.create_index("ix_tracks_geometry", "tracks", ["track_geometry"], postgresql_using="gist")

    op.create_table(
        "trains",
        sa.Column("id", postgresql.UUID(as_uuid=True), primary_key=True, server_default=sa.text("gen_random_uuid()")),
        sa.Column("designation", sa.String(length=64), nullable=False, unique=True),
        sa.Column("operator_id", postgresql.UUID(as_uuid=True), nullable=True),
        sa.Column("home_station_id", postgresql.UUID(as_uuid=True), nullable=True),
        sa.Column("capacity", sa.Integer(), nullable=False),
        sa.Column("max_speed_kph", sa.Integer(), nullable=False),
        sa.Column("consist", sa.Text(), nullable=True),
        sa.Column("created_at", sa.DateTime(timezone=True), server_default=sa.text("timezone('utc', now())"), nullable=False),
        sa.Column("updated_at", sa.DateTime(timezone=True), server_default=sa.text("timezone('utc', now())"), nullable=False),
        sa.ForeignKeyConstraint(["operator_id"], ["users.id"], ondelete="SET NULL"),
        sa.ForeignKeyConstraint(["home_station_id"], ["stations.id"], ondelete="SET NULL"),
    )

    op.create_table(
        "train_schedules",
        sa.Column("id", postgresql.UUID(as_uuid=True), primary_key=True, server_default=sa.text("gen_random_uuid()")),
        sa.Column("train_id", postgresql.UUID(as_uuid=True), nullable=False),
        sa.Column("sequence_index", sa.Integer(), nullable=False),
        sa.Column("station_id", postgresql.UUID(as_uuid=True), nullable=False),
        sa.Column("scheduled_arrival", sa.DateTime(timezone=True), nullable=True),
        sa.Column("scheduled_departure", sa.DateTime(timezone=True), nullable=True),
        sa.Column("dwell_seconds", sa.Integer(), nullable=True),
        sa.Column("created_at", sa.DateTime(timezone=True), server_default=sa.text("timezone('utc', now())"), nullable=False),
        sa.Column("updated_at", sa.DateTime(timezone=True), server_default=sa.text("timezone('utc', now())"), nullable=False),
        sa.ForeignKeyConstraint(["train_id"], ["trains.id"], ondelete="CASCADE"),
        sa.ForeignKeyConstraint(["station_id"], ["stations.id"], ondelete="CASCADE"),
        sa.UniqueConstraint("train_id", "sequence_index", name="uq_train_schedule_sequence"),
    )


def downgrade() -> None:
    op.drop_table("train_schedules")
    op.drop_table("trains")
    op.drop_index("ix_tracks_geometry", table_name="tracks")
    op.drop_table("tracks")
    op.drop_index("ix_stations_location", table_name="stations")
    op.drop_table("stations")
    op.drop_table("users")
    op.execute("DROP EXTENSION IF EXISTS pgcrypto")
    op.execute("DROP EXTENSION IF EXISTS postgis")