"""Create independent detail presentation records for frontend pages.

Revision ID: 0021_detail_records
Revises: 0020_home_team_building_details
"""

from datetime import datetime

from alembic import context, op
import sqlalchemy as sa
from sqlalchemy import inspect
from sqlalchemy.dialects import postgresql

from app.migration_compat import baseline_table_names


revision = "0021_detail_records"
down_revision = "0020_home_team_building_details"
branch_labels = None
depends_on = None


DETAIL_RECORD_INDEXES = {
    "ix_DetailRecord_isActive": ["isActive"],
    "ix_DetailRecord_sortOrder": ["sortOrder"],
}


def missing_detail_record_indexes(existing_indexes: set[str]) -> set[str]:
    return set(DETAIL_RECORD_INDEXES).difference(existing_indexes)


def build_detail_seed_rows(routes, existing_keys: set[str], timestamp: datetime) -> list[dict]:
    return [
        {
            "id": f"detail-{route['id']}",
            "key": route["id"],
            "eyebrow": "玩法推荐",
            "duration": "5天4晚",
            "title": route["title"],
            "subtitle": route["subtitle"],
            "intro": route["subtitle"],
            "highlights": ["核心景观串联", "小团出行，按同行人的节奏灵活调整"],
            "included": ["行程内用车与接送服务"],
            "excluded": ["往返大交通及个人消费"],
            "notes": ["最终方案以出行日期、人数和资源确认结果为准。"],
            "gallery": [route["image"]],
            "isActive": True,
            "sortOrder": route["sortOrder"],
            "createdAt": timestamp,
            "updatedAt": timestamp,
        }
        for route in routes
        if route["id"] not in existing_keys
    ]


def is_offline_mode() -> bool:
    try:
        return context.is_offline_mode()
    except (NameError, AttributeError):
        return False


def _create_detail_table() -> None:
    op.create_table(
        "DetailRecord",
        sa.Column("id", sa.String(), nullable=False),
        sa.Column("key", sa.String(), nullable=False),
        sa.Column("eyebrow", sa.String(), nullable=False),
        sa.Column("duration", sa.String(), nullable=False),
        sa.Column("title", sa.String(), nullable=False),
        sa.Column("subtitle", sa.Text(), nullable=False),
        sa.Column("intro", sa.Text(), nullable=False),
        sa.Column("highlights", postgresql.JSONB(astext_type=sa.Text()), nullable=False, server_default=sa.text("'[]'::jsonb")),
        sa.Column("included", postgresql.JSONB(astext_type=sa.Text()), nullable=False, server_default=sa.text("'[]'::jsonb")),
        sa.Column("excluded", postgresql.JSONB(astext_type=sa.Text()), nullable=False, server_default=sa.text("'[]'::jsonb")),
        sa.Column("notes", postgresql.JSONB(astext_type=sa.Text()), nullable=False, server_default=sa.text("'[]'::jsonb")),
        sa.Column("gallery", postgresql.JSONB(astext_type=sa.Text()), nullable=False, server_default=sa.text("'[]'::jsonb")),
        sa.Column("isActive", sa.Boolean(), nullable=False, server_default=sa.text("true")),
        sa.Column("sortOrder", sa.Integer(), nullable=False, server_default="0"),
        sa.Column("createdAt", sa.DateTime(), nullable=False),
        sa.Column("updatedAt", sa.DateTime(), nullable=False),
        sa.PrimaryKeyConstraint("id"),
        sa.UniqueConstraint("key"),
    )


def upgrade() -> None:
    if is_offline_mode():
        table_exists = "DetailRecord" in baseline_table_names()
        existing_index_names = set()
    else:
        bind = op.get_bind()
        inspector = inspect(bind)
        table_exists = "DetailRecord" in set(inspector.get_table_names())
        existing_index_names = {
            index["name"]
            for index in inspector.get_indexes("DetailRecord")
        } if table_exists else set()

    created_table = not table_exists
    if created_table:
        _create_detail_table()
        existing_index_names = set()

    if created_table:
        for index_name in missing_detail_record_indexes(existing_index_names):
            op.create_index(index_name, "DetailRecord", DETAIL_RECORD_INDEXES[index_name])

    detail_table = sa.table(
        "DetailRecord",
        sa.column("id", sa.String()),
        sa.column("key", sa.String()),
        sa.column("eyebrow", sa.String()),
        sa.column("duration", sa.String()),
        sa.column("title", sa.String()),
        sa.column("subtitle", sa.Text()),
        sa.column("intro", sa.Text()),
        sa.column("highlights", postgresql.JSONB()),
        sa.column("included", postgresql.JSONB()),
        sa.column("excluded", postgresql.JSONB()),
        sa.column("notes", postgresql.JSONB()),
        sa.column("gallery", postgresql.JSONB()),
        sa.column("isActive", sa.Boolean()),
        sa.column("sortOrder", sa.Integer()),
        sa.column("createdAt", sa.DateTime()),
        sa.column("updatedAt", sa.DateTime()),
    )
    timestamp = datetime(2026, 1, 1)
    if is_offline_mode():
        return

    conn = op.get_bind()
    routes = conn.execute(
        sa.text('SELECT "id", "title", "subtitle", "image", "sortOrder" FROM "WanfaRoute" ORDER BY "sortOrder" ASC')
    ).mappings().all()
    existing_key_result = conn.execute(sa.text('SELECT "key" FROM "DetailRecord"'))
    if hasattr(existing_key_result, "scalars"):
        existing_key_values = existing_key_result.scalars()
    elif hasattr(existing_key_result, "all"):
        existing_key_values = [row[0] for row in existing_key_result.all()]
    else:
        existing_key_values = existing_key_result
    existing_keys = set(existing_key_values)
    seed_rows = build_detail_seed_rows(routes, existing_keys, timestamp)
    if seed_rows:
        op.bulk_insert(detail_table, seed_rows)


def downgrade() -> None:
    op.drop_index("ix_DetailRecord_sortOrder", table_name="DetailRecord")
    op.drop_index("ix_DetailRecord_isActive", table_name="DetailRecord")
    op.drop_table("DetailRecord")