"""Governed control-plane endpoints for AI-authored data rules."""

from __future__ import annotations

from typing import Any

from flask import current_app, g, jsonify, request

from app import db
from app.api.data_rules import bp
from app.core.data_rules.authoring import (
    OpenAICompatibleRuleModel,
    RuleAuthoringAgent,
)
from app.core.data_rules.contracts import (
    dataflow_spec_hash,
    rule_spec_hash,
    standard_spec_hash,
    validate_dataflow_spec,
    validate_rule_spec,
    validate_standard_spec,
)
from app.core.data_rules.production_line import resolve_production_line
from app.core.data_rules.release import ProductionLineReleaseService
from app.core.data_rules.repository import DataRuleRepository
from app.core.data_rules.schema_resolver import (
    Neo4jSchemaMetadataCatalog,
    SchemaResolver,
)
from app.models.result import failed, success

_VALIDATORS = {
    "rule": (validate_rule_spec, rule_spec_hash),
    "standard": (validate_standard_spec, standard_spec_hash),
    "dataflow": (validate_dataflow_spec, dataflow_spec_hash),
}


def _body() -> dict[str, Any]:
    value = request.get_json(silent=True)
    if not isinstance(value, dict):
        raise ValueError("request body must be an object")
    return value


def _bad_request(message: str = "规则请求无效"):
    return jsonify(failed(message, code=400)), 400


def _closed_body(allowed: set[str]) -> dict[str, Any]:
    body = _body()
    if set(body) - allowed:
        raise ValueError("request contains unsupported fields")
    return body


def _repository() -> DataRuleRepository:
    configured = current_app.extensions.get("data_rule_repository")
    if configured is not None:
        return configured
    return DataRuleRepository(db.session)


def _release_service() -> ProductionLineReleaseService:
    configured = current_app.extensions.get("production_line_release_service")
    if configured is not None:
        return configured
    repository = _repository()
    resolver = current_app.extensions.get("data_rule_schema_resolver")
    if resolver is None:
        catalog = current_app.extensions.get("data_rule_metadata_catalog")
        resolver = SchemaResolver(catalog or Neo4jSchemaMetadataCatalog(), repository)
    return ProductionLineReleaseService(repository, schema_resolver=resolver)


@bp.get("/capabilities")
def capabilities():
    return jsonify(
        success(
            {
                "natural_language_authoring": True,
                "schema_constrained_candidates": True,
                "production_line_preview": True,
                "immutable_asset_versions": True,
                "server_side_publishing": True,
                "production_line_release": True,
                "data_factory_activation": False,
            }
        )
    )


@bp.post("/validate")
def validate_asset():
    try:
        body = _body()
        asset_type = body.get("asset_type")
        if asset_type not in _VALIDATORS:
            raise ValueError("unsupported asset type")
        validator, hasher = _VALIDATORS[asset_type]
        normalized = validator(body.get("spec"))
        return jsonify(
            success(
                {
                    "asset_type": asset_type,
                    "normalized": normalized,
                    "spec_hash": hasher(normalized),
                }
            )
        )
    except (TypeError, ValueError):
        return _bad_request("规则定义无效")


def _authoring_agent() -> RuleAuthoringAgent:
    configured = current_app.extensions.get("data_rule_authoring_agent")
    if configured is not None:
        return configured
    api_key = current_app.config.get("LLM_API_KEY") or current_app.config.get(
        "DEEPSEEK_API_KEY"
    )
    if not api_key:
        raise RuntimeError("rule authoring model is not configured")
    agent = RuleAuthoringAgent(model=OpenAICompatibleRuleModel())
    current_app.extensions["data_rule_authoring_agent"] = agent
    return agent


@bp.post("/interpret")
def interpret_rule():
    try:
        body = _body()
        result = _authoring_agent().interpret(
            source_text=body.get("source_text"),
            authoring_surface=body.get("authoring_surface"),
            context=body.get("context", {}),
        )
        audit = _repository().record_generation_run(evidence=result)
        db.session.commit()
        result = {
            **result,
            "generation_run_id": audit["id"],
            "correlation_id": audit["correlation_id"],
        }
        return jsonify(success(result))
    except (TypeError, ValueError):
        db.session.rollback()
        return _bad_request("自然语言规则描述无效")
    except RuntimeError:
        db.session.rollback()
        return jsonify(failed("AI 规则解析服务未配置", code=503)), 503
    except Exception:
        db.session.rollback()
        current_app.logger.exception("AI rule interpretation failed")
        return jsonify(failed("AI 规则解析暂时不可用", code=503)), 503


@bp.post("/rule-versions")
def create_rule_version():
    try:
        body = _closed_body(
            {
                "rule_spec",
                "source_text",
                "category",
                "source_language",
                "generated_kind",
            }
        )
        # Enforce V2 at the HTTP boundary even when a test/different
        # repository implementation is injected.
        rule_spec = validate_rule_spec(body.get("rule_spec"))
        result = _repository().create_rule_version(
            rule_spec=rule_spec,
            source_text=body.get("source_text"),
            category=body.get("category", "general"),
            source_language=body.get("source_language", "zh-CN"),
            generated_kind=body.get("generated_kind", "rulespec"),
            created_by=g.current_user["id"],
        )
        db.session.commit()
        return jsonify(success(result, "规则版本创建成功")), 201
    except (TypeError, ValueError):
        db.session.rollback()
        return _bad_request("规则版本定义无效")
    except Exception:
        db.session.rollback()
        current_app.logger.exception("create rule version failed")
        return jsonify(failed("规则版本创建失败", code=500)), 500


@bp.post("/rule-versions/<version_id>/publish")
def publish_rule_version(version_id: str):
    try:
        if request.get_data(cache=True) and request.get_json(silent=True) not in (
            None,
            {},
        ):
            raise ValueError("publish request must not contain fields")
        result = _repository().publish_rule_version(
            version_id=version_id,
            published_by=g.current_user["id"],
        )
        db.session.commit()
        return jsonify(success(result, "规则版本发布成功"))
    except (TypeError, ValueError):
        db.session.rollback()
        return jsonify(failed("规则版本无法发布", code=409)), 409
    except Exception:
        db.session.rollback()
        current_app.logger.exception("publish rule version failed")
        return jsonify(failed("规则版本发布失败", code=500)), 500


@bp.post("/standard-versions")
def create_standard_version():
    try:
        body = _closed_body({"standard_spec", "source_text"})
        result = _repository().create_standard_version(
            standard_spec=body.get("standard_spec"),
            source_text=body.get("source_text"),
            created_by=g.current_user["id"],
        )
        db.session.commit()
        return jsonify(success(result, "数据标准版本创建成功")), 201
    except (TypeError, ValueError):
        db.session.rollback()
        return _bad_request("数据标准版本定义无效")
    except Exception:
        db.session.rollback()
        current_app.logger.exception("create standard version failed")
        return jsonify(failed("数据标准版本创建失败", code=500)), 500


@bp.post("/standard-versions/<version_id>/publish")
def publish_standard_version(version_id: str):
    try:
        if request.get_data(cache=True) and request.get_json(silent=True) not in (
            None,
            {},
        ):
            raise ValueError("publish request must not contain fields")
        result = _repository().publish_standard_version(
            version_id=version_id,
            published_by=g.current_user["id"],
        )
        db.session.commit()
        return jsonify(success(result, "数据标准版本发布成功"))
    except (TypeError, ValueError):
        db.session.rollback()
        return jsonify(failed("数据标准版本无法发布", code=409)), 409
    except Exception:
        db.session.rollback()
        current_app.logger.exception("publish standard version failed")
        return jsonify(failed("数据标准版本发布失败", code=500)), 500


@bp.post("/production-lines/resolve")
def resolve_production_line_preview():
    try:
        body = _body()
        package = resolve_production_line(
            body.get("dataflow_spec"),
            body.get("standard_versions"),
            body.get("rule_versions"),
            component_binding_ids=body.get("component_binding_ids"),
        )
        return jsonify(
            success(
                {
                    "preview": True,
                    "release_ready": False,
                    "package": package,
                }
            )
        )
    except (TypeError, ValueError):
        return _bad_request("数据生产线定义无效")


@bp.post("/production-lines/<dataflow_uid>/release")
def release_production_line(dataflow_uid: str):
    try:
        body = _closed_body(
            {
                "dataflow_spec",
                "source_text",
            }
        )
        result = _release_service().release(
            dataflow_uid=dataflow_uid,
            dataflow_spec=body.get("dataflow_spec"),
            source_text=body.get("source_text"),
            created_by=g.current_user["id"],
        )
        db.session.commit()
        return jsonify(success(result, "数据生产线发布成功")), 201
    except (TypeError, ValueError):
        db.session.rollback()
        return jsonify(failed("数据生产线无法发布", code=409)), 409
    except Exception:
        db.session.rollback()
        current_app.logger.exception("release production line failed")
        return jsonify(failed("数据生产线发布失败", code=500)), 500