"""供其他 Agent 复用的 NL2SQL 查询编排入口。"""
from __future__ import annotations

from collections.abc import Awaitable, Callable
from dataclasses import replace
from typing import Any

from nl2sql.contracts import DataQueryRequest
from nl2sql.executor import QueryExecutionError, execute_readonly_sql
from nl2sql.row_scope import RowScopeError, apply_row_scope
from nl2sql.result import build_chart_config, summarize_result
from nl2sql.query_experience import apply_query_options, build_query_explanation
from nl2sql.supervisor import UnsupportedIntent, ensure_query_intent
from nl2sql.sql_agent import generate_sql
from nl2sql.sql_security import SqlSecurityError, validate_select_sql


class QueryServiceError(RuntimeError):
    """查询编排失败或当前用户没有查询权限。"""


async def query(
    request: DataQueryRequest,
    *,
    permission_loader: Callable[[int], Awaitable[dict[str, Any]]],
    metadata_retriever: Callable[[str], Awaitable[list[dict[str, Any]]]] | None,
    schema_loader: Callable[[set[str], dict[str, Any]], Awaitable[dict[str, Any]]] | None,
    llm_client=None,
    few_shot_retriever: Callable[[str], Awaitable[list[dict[str, Any]]]] | None = None,
    conversation_context: str = "",
):
    """执行权限、召回、权威 Schema、生成和安全校验，返回可执行 SQL。"""
    try:
        ensure_query_intent(request.question)
    except UnsupportedIntent as exc:
        raise QueryServiceError(str(exc)) from exc
    permission = await permission_loader(request.user_id)
    if not permission.get("can_query", False):
        raise QueryServiceError("当前用户没有 NL2SQL 查询权限")
    if metadata_retriever is None or schema_loader is None:
        raise QueryServiceError("NL2SQL 查询依赖未配置")

    hits = await metadata_retriever(request.question)
    candidate_tables = {
        hit.get("table_name")
        for hit in hits
        if hit.get("table_name") in permission.get("tables", set())
    }
    if not candidate_tables:
        raise QueryServiceError("未找到有权限的业务表")
    schema = await schema_loader(candidate_tables, permission)
    if not schema.get("tables"):
        raise QueryServiceError("候选表未通过权威 Schema 校验")

    few_shot = []
    if few_shot_retriever is not None:
        try:
            few_shot = await few_shot_retriever(request.question)
        except Exception:  # noqa: BLE001 Few-shot 故障不阻断主查询
            few_shot = []
    generated = await generate_sql(
        request.question,
        schema,
        llm_client=llm_client,
        few_shot=few_shot,
        conversation_context=conversation_context,
    )
    max_rows = request.max_rows or permission.get("max_rows") or 1000
    try:
        validated = validate_select_sql(
            generated.sql,
            authorized_tables=permission.get("tables", set()),
            authorized_columns=permission.get("columns"),
            max_rows=max_rows,
        )
        try:
            scoped_sql = apply_row_scope(
                validated.sql,
                permission,
                request.data_scope,
            )
        except RowScopeError as exc:
            raise QueryServiceError("行级权限范围无效") from exc
        option_sql = apply_query_options(
            scoped_sql,
            page=request.page,
            page_size=request.page_size,
            sort_by=request.sort_by,
            sort_order=request.sort_order,
        )
        # columns 为 None 表示不做列级限制；仅当配置了列权限时才需要
        # 保证行级范围列可访问。保持 dict（含空 dict）行为不变。
        if permission.get("columns") is None:
            final_columns = None
        else:
            final_columns = {
                table: set(columns)
                for table, columns in permission["columns"].items()
            }
            for table, scope in (permission.get("row_scopes") or {}).items():
                if scope.get("column"):
                    final_columns.setdefault(table, set()).add(scope["column"])
        validated_option_sql = validate_select_sql(
            option_sql,
            authorized_tables=permission.get("tables", set()),
            authorized_columns=final_columns,
            max_rows=max_rows,
        )
        return validated_option_sql
    except SqlSecurityError as exc:
        raise QueryServiceError("生成的 SQL 未通过安全校验") from exc


async def execute_query(
    request: DataQueryRequest,
    *,
    session,
    query_id: str,
    permission_loader: Callable[[int], Awaitable[dict[str, Any]]],
    metadata_retriever: Callable[[str], Awaitable[list[dict[str, Any]]]] | None,
    schema_loader: Callable[[set[str], dict[str, Any]], Awaitable[dict[str, Any]]] | None,
    llm_client=None,
    masks: dict[tuple[str, str], str] | None = None,
    timeout_seconds: float | None = None,
    summary_llm=None,
    few_shot_retriever: Callable[[str], Awaitable[list[dict[str, Any]]]] | None = None,
    conversation_context: str = "",
):
    """完成 SQL 编排、只读执行和统一结果返回。"""
    validated = await query(
        request,
        permission_loader=permission_loader,
        metadata_retriever=metadata_retriever,
        schema_loader=schema_loader,
        llm_client=llm_client,
        few_shot_retriever=few_shot_retriever,
        conversation_context=conversation_context,
    )
    try:
        parameters = (
            {"advisor_id": request.user_id}
            if ":advisor_id" in validated.sql
            else None
        )
        result = await execute_readonly_sql(
            session,
            validated,
            query_id=query_id,
            trace_id=request.trace_id,
            user_id=request.user_id,
            masks=masks,
            max_rows=request.max_rows,
            parameters=parameters,
            timeout_seconds=timeout_seconds,
        )
    except QueryExecutionError as exc:
        raise QueryServiceError("查询执行失败") from exc
    result = replace(
        result,
        summary=(
            await summarize_result(
                request.question,
                result.columns,
                result.rows,
                llm_client=summary_llm,
            )
            if summary_llm is not None
            else None
        ),
        chart=build_chart_config(result.columns, result.rows),
        metric_definitions=build_query_explanation(request.question, validated.sql)["metrics"],
        query_plan={
            **build_query_explanation(request.question, validated.sql)["plan"],
            "page": request.page,
            "page_size": request.page_size,
            "sort_by": request.sort_by,
            "sort_order": request.sort_order,
        },
    )
    if not request.include_sql:
        result = replace(result, sql=None)
    return result