"""add pmflow change review tables

Revision ID: 20260426_add_pmflow_change_review_tables
Revises: 20260425_add_pmflow_launch_tables
Create Date: 2026-04-26
"""

from __future__ import annotations

from alembic import op
import sqlalchemy as sa

try:
    from sqlalchemy.dialects.postgresql import JSONB
except Exception:  # pragma: no cover
    JSONB = sa.JSON


revision = "20260426_add_pmflow_change_review_tables"
down_revision = "20260425_add_pmflow_launch_tables"
branch_labels = None
depends_on = None


def _json_type(bind):
    return JSONB() if bind.dialect.name == "postgresql" else sa.JSON()


def _table_exists(bind, table_name: str) -> bool:
    return sa.inspect(bind).has_table(table_name)


def upgrade() -> None:
    bind = op.get_bind()
    json_type = _json_type(bind)

    if not _table_exists(bind, "pmflow_change_sets"):
        op.create_table(
            "pmflow_change_sets",
            sa.Column("id", sa.Integer(), primary_key=True, autoincrement=True),
            sa.Column("tenant_id", sa.BigInteger(), nullable=False),
            sa.Column("created_at", sa.TIMESTAMP(), server_default=sa.func.now(), nullable=False),
            sa.Column("updated_at", sa.TIMESTAMP(), server_default=sa.func.now(), nullable=False),
            sa.Column("project_id", sa.BigInteger(), sa.ForeignKey("projects.id"), nullable=False),
            sa.Column("thread_id", sa.BigInteger(), sa.ForeignKey("pmflow_threads.id"), nullable=False),
            sa.Column("source_message_id", sa.BigInteger(), sa.ForeignKey("pmflow_thread_messages.id"), nullable=False),
            sa.Column("status", sa.String(length=32), nullable=False, server_default="open"),
            sa.Column("summary", sa.Text(), nullable=False),
            sa.Column("headline", sa.String(length=255), nullable=False),
            sa.Column("extraction_scope", sa.String(length=64), nullable=False, server_default="latest_message"),
            sa.Column("routing_meta", json_type, nullable=False),
            sa.Column("llm_call_id", sa.String(length=128), nullable=True),
            sa.Column("created_by", sa.BigInteger(), sa.ForeignKey("users.id"), nullable=False),
            sa.Column("reviewed_at", sa.TIMESTAMP(), nullable=True),
            sa.Column("committed_at", sa.TIMESTAMP(), nullable=True),
        )
        op.create_index("ix_pmflow_change_sets_tenant_id", "pmflow_change_sets", ["tenant_id"], unique=False)
        op.create_index("ix_pmflow_change_sets_project_id", "pmflow_change_sets", ["project_id"], unique=False)
        op.create_index("ix_pmflow_change_sets_thread_id", "pmflow_change_sets", ["thread_id"], unique=False)
        op.create_index("ix_pmflow_change_sets_source_message_id", "pmflow_change_sets", ["source_message_id"], unique=False)
        op.create_index("ix_pmflow_change_sets_status", "pmflow_change_sets", ["status"], unique=False)
        op.create_index("ix_pmflow_change_sets_created_by", "pmflow_change_sets", ["created_by"], unique=False)

    if not _table_exists(bind, "pmflow_change_items"):
        op.create_table(
            "pmflow_change_items",
            sa.Column("id", sa.Integer(), primary_key=True, autoincrement=True),
            sa.Column("tenant_id", sa.BigInteger(), nullable=False),
            sa.Column("created_at", sa.TIMESTAMP(), server_default=sa.func.now(), nullable=False),
            sa.Column("updated_at", sa.TIMESTAMP(), server_default=sa.func.now(), nullable=False),
            sa.Column("change_set_id", sa.BigInteger(), sa.ForeignKey("pmflow_change_sets.id"), nullable=False),
            sa.Column("project_id", sa.BigInteger(), sa.ForeignKey("projects.id"), nullable=False),
            sa.Column("group", sa.String(length=32), nullable=False),
            sa.Column("object_type", sa.String(length=64), nullable=False),
            sa.Column("object_id", sa.String(length=128), nullable=True),
            sa.Column("title", sa.String(length=255), nullable=False),
            sa.Column("summary", sa.Text(), nullable=False),
            sa.Column("diff", sa.Text(), nullable=False),
            sa.Column("payload", json_type, nullable=False),
            sa.Column("edited_payload", json_type, nullable=True),
            sa.Column("confidence", sa.Float(), nullable=True),
            sa.Column("risk_level", sa.String(length=16), nullable=False, server_default="medium"),
            sa.Column("status", sa.String(length=32), nullable=False, server_default="pending_review"),
            sa.Column("reviewed_at", sa.TIMESTAMP(), nullable=True),
        )
        op.create_index("ix_pmflow_change_items_tenant_id", "pmflow_change_items", ["tenant_id"], unique=False)
        op.create_index("ix_pmflow_change_items_change_set_id", "pmflow_change_items", ["change_set_id"], unique=False)
        op.create_index("ix_pmflow_change_items_project_id", "pmflow_change_items", ["project_id"], unique=False)
        op.create_index("ix_pmflow_change_items_status", "pmflow_change_items", ["status"], unique=False)

    if not _table_exists(bind, "pmflow_approvals"):
        op.create_table(
            "pmflow_approvals",
            sa.Column("id", sa.Integer(), primary_key=True, autoincrement=True),
            sa.Column("tenant_id", sa.BigInteger(), nullable=False),
            sa.Column("created_at", sa.TIMESTAMP(), server_default=sa.func.now(), nullable=False),
            sa.Column("updated_at", sa.TIMESTAMP(), server_default=sa.func.now(), nullable=False),
            sa.Column("project_id", sa.BigInteger(), sa.ForeignKey("projects.id"), nullable=False),
            sa.Column("change_set_id", sa.BigInteger(), sa.ForeignKey("pmflow_change_sets.id"), nullable=False),
            sa.Column("change_item_id", sa.BigInteger(), sa.ForeignKey("pmflow_change_items.id"), nullable=False),
            sa.Column("actor_user_id", sa.BigInteger(), sa.ForeignKey("users.id"), nullable=False),
            sa.Column("action", sa.String(length=32), nullable=False),
            sa.Column("decision", sa.String(length=32), nullable=False),
            sa.Column("before_status", sa.String(length=32), nullable=False),
            sa.Column("after_status", sa.String(length=32), nullable=False),
            sa.Column("before_payload", json_type, nullable=False),
            sa.Column("after_payload", json_type, nullable=False),
            sa.Column("reason", sa.Text(), nullable=True),
        )
        op.create_index("ix_pmflow_approvals_tenant_id", "pmflow_approvals", ["tenant_id"], unique=False)
        op.create_index("ix_pmflow_approvals_project_id", "pmflow_approvals", ["project_id"], unique=False)
        op.create_index("ix_pmflow_approvals_change_set_id", "pmflow_approvals", ["change_set_id"], unique=False)
        op.create_index("ix_pmflow_approvals_change_item_id", "pmflow_approvals", ["change_item_id"], unique=False)
        op.create_index("ix_pmflow_approvals_actor_user_id", "pmflow_approvals", ["actor_user_id"], unique=False)

    if not _table_exists(bind, "pmflow_evidence_links"):
        op.create_table(
            "pmflow_evidence_links",
            sa.Column("id", sa.Integer(), primary_key=True, autoincrement=True),
            sa.Column("tenant_id", sa.BigInteger(), nullable=False),
            sa.Column("created_at", sa.TIMESTAMP(), server_default=sa.func.now(), nullable=False),
            sa.Column("updated_at", sa.TIMESTAMP(), server_default=sa.func.now(), nullable=False),
            sa.Column("project_id", sa.BigInteger(), sa.ForeignKey("projects.id"), nullable=False),
            sa.Column("change_set_id", sa.BigInteger(), sa.ForeignKey("pmflow_change_sets.id"), nullable=False),
            sa.Column("change_item_id", sa.BigInteger(), sa.ForeignKey("pmflow_change_items.id"), nullable=True),
            sa.Column("source_type", sa.String(length=64), nullable=False),
            sa.Column("source_id", sa.String(length=128), nullable=False),
            sa.Column("title", sa.String(length=255), nullable=False),
            sa.Column("excerpt", sa.Text(), nullable=False),
            sa.Column("display_label", sa.String(length=255), nullable=False),
            sa.Column("evidence_metadata", json_type, nullable=False),
        )
        op.create_index("ix_pmflow_evidence_links_tenant_id", "pmflow_evidence_links", ["tenant_id"], unique=False)
        op.create_index("ix_pmflow_evidence_links_project_id", "pmflow_evidence_links", ["project_id"], unique=False)
        op.create_index("ix_pmflow_evidence_links_change_set_id", "pmflow_evidence_links", ["change_set_id"], unique=False)
        op.create_index("ix_pmflow_evidence_links_change_item_id", "pmflow_evidence_links", ["change_item_id"], unique=False)
        op.create_index("ix_pmflow_evidence_links_source_type", "pmflow_evidence_links", ["source_type"], unique=False)
        op.create_index("ix_pmflow_evidence_links_source_id", "pmflow_evidence_links", ["source_id"], unique=False)


def downgrade() -> None:
    bind = op.get_bind()
    for index_name, table_name in (
        ("ix_pmflow_evidence_links_source_id", "pmflow_evidence_links"),
        ("ix_pmflow_evidence_links_source_type", "pmflow_evidence_links"),
        ("ix_pmflow_evidence_links_change_item_id", "pmflow_evidence_links"),
        ("ix_pmflow_evidence_links_change_set_id", "pmflow_evidence_links"),
        ("ix_pmflow_evidence_links_project_id", "pmflow_evidence_links"),
        ("ix_pmflow_evidence_links_tenant_id", "pmflow_evidence_links"),
        ("ix_pmflow_approvals_actor_user_id", "pmflow_approvals"),
        ("ix_pmflow_approvals_change_item_id", "pmflow_approvals"),
        ("ix_pmflow_approvals_change_set_id", "pmflow_approvals"),
        ("ix_pmflow_approvals_project_id", "pmflow_approvals"),
        ("ix_pmflow_approvals_tenant_id", "pmflow_approvals"),
        ("ix_pmflow_change_items_status", "pmflow_change_items"),
        ("ix_pmflow_change_items_project_id", "pmflow_change_items"),
        ("ix_pmflow_change_items_change_set_id", "pmflow_change_items"),
        ("ix_pmflow_change_items_tenant_id", "pmflow_change_items"),
        ("ix_pmflow_change_sets_created_by", "pmflow_change_sets"),
        ("ix_pmflow_change_sets_status", "pmflow_change_sets"),
        ("ix_pmflow_change_sets_source_message_id", "pmflow_change_sets"),
        ("ix_pmflow_change_sets_thread_id", "pmflow_change_sets"),
        ("ix_pmflow_change_sets_project_id", "pmflow_change_sets"),
        ("ix_pmflow_change_sets_tenant_id", "pmflow_change_sets"),
    ):
        if _table_exists(bind, table_name):
            try:
                op.drop_index(index_name, table_name=table_name)
            except Exception:
                pass
    for table_name in ("pmflow_evidence_links", "pmflow_approvals", "pmflow_change_items", "pmflow_change_sets"):
        if _table_exists(bind, table_name):
            op.drop_table(table_name)