"""add conversation history

Revision ID: 20260710_0003
Revises: 20260710_0002
"""

from collections.abc import Sequence

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


revision: str = "20260710_0003"
down_revision: str | Sequence[str] | None = "20260710_0002"
branch_labels: str | Sequence[str] | None = None
depends_on: str | Sequence[str] | None = None


def upgrade() -> None:
    op.create_table(
        "conversation_sessions",
        sa.Column("id", sa.String(length=40), nullable=False),
        sa.Column("assistant_id", sa.String(length=40), nullable=True),
        sa.Column("assistant_name", sa.String(length=128), server_default="", nullable=False),
        sa.Column("channel", sa.String(length=24), nullable=False),
        sa.Column("runtime_mode", sa.String(length=16), server_default="pipeline", nullable=False),
        sa.Column("status", sa.String(length=16), server_default="active", nullable=False),
        sa.Column("message_count", sa.Integer(), server_default="0", nullable=False),
        sa.Column("started_at", sa.DateTime(timezone=True), server_default=sa.text("now()"), nullable=False),
        sa.Column("ended_at", sa.DateTime(timezone=True), nullable=True),
        sa.Column("extra", postgresql.JSONB(astext_type=sa.Text()), server_default=sa.text("'{}'::jsonb"), nullable=False),
        sa.ForeignKeyConstraint(["assistant_id"], ["assistants.id"], ondelete="SET NULL"),
        sa.PrimaryKeyConstraint("id"),
    )
    op.create_index("ix_conversation_sessions_assistant_id", "conversation_sessions", ["assistant_id"])
    op.create_index("ix_conversation_sessions_channel", "conversation_sessions", ["channel"])
    op.create_index("ix_conversation_sessions_status", "conversation_sessions", ["status"])
    op.create_index("ix_conversation_sessions_started_at", "conversation_sessions", ["started_at"])

    op.create_table(
        "conversation_messages",
        sa.Column("id", sa.String(length=40), nullable=False),
        sa.Column("session_id", sa.String(length=40), nullable=False),
        sa.Column("sequence", sa.Integer(), nullable=False),
        sa.Column("role", sa.String(length=16), nullable=False),
        sa.Column("content_type", sa.String(length=16), server_default="text", nullable=False),
        sa.Column("content", sa.Text(), server_default="", nullable=False),
        sa.Column("occurred_at", sa.DateTime(timezone=True), server_default=sa.text("now()"), nullable=False),
        sa.Column("extra", postgresql.JSONB(astext_type=sa.Text()), server_default=sa.text("'{}'::jsonb"), nullable=False),
        sa.ForeignKeyConstraint(["session_id"], ["conversation_sessions.id"], ondelete="CASCADE"),
        sa.PrimaryKeyConstraint("id"),
        sa.UniqueConstraint("session_id", "sequence", name="uq_conversation_message_sequence"),
    )
    op.create_index("ix_conversation_messages_session_id", "conversation_messages", ["session_id"])

    op.create_table(
        "conversation_artifacts",
        sa.Column("id", sa.String(length=40), nullable=False),
        sa.Column("session_id", sa.String(length=40), nullable=False),
        sa.Column("message_id", sa.String(length=40), nullable=True),
        sa.Column("kind", sa.String(length=16), nullable=False),
        sa.Column("storage_uri", sa.String(length=1024), nullable=False),
        sa.Column("mime_type", sa.String(length=128), server_default="", nullable=False),
        sa.Column("size_bytes", sa.Integer(), nullable=True),
        sa.Column("duration_ms", sa.Integer(), nullable=True),
        sa.Column("created_at", sa.DateTime(timezone=True), server_default=sa.text("now()"), nullable=False),
        sa.Column("extra", postgresql.JSONB(astext_type=sa.Text()), server_default=sa.text("'{}'::jsonb"), nullable=False),
        sa.ForeignKeyConstraint(["message_id"], ["conversation_messages.id"], ondelete="SET NULL"),
        sa.ForeignKeyConstraint(["session_id"], ["conversation_sessions.id"], ondelete="CASCADE"),
        sa.PrimaryKeyConstraint("id"),
    )
    op.create_index("ix_conversation_artifacts_session_id", "conversation_artifacts", ["session_id"])
    op.create_index("ix_conversation_artifacts_message_id", "conversation_artifacts", ["message_id"])
    op.create_index("ix_conversation_artifacts_kind", "conversation_artifacts", ["kind"])


def downgrade() -> None:
    op.drop_table("conversation_artifacts")
    op.drop_table("conversation_messages")
    op.drop_table("conversation_sessions")