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// Licensed to the Apache Software Foundation (ASF) under one

// or more contributor license agreements. See the NOTICE file

// distributed with this work for additional information

// regarding copyright ownership. The ASF licenses this file

// to you under the Apache License, Version 2.0 (the

// "License"); you may not use this file except in compliance

// with the License. You may obtain a copy of the License at

//

// http://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing,

// software distributed under the License is distributed on an

// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY

// KIND, either express or implied. See the License for the

// specific language governing permissions and limitations

// under the License.

mod dialect;

use std::sync::Arc;

use datafusion::sql::unparser::Unparser;

use datafusion::sql::unparser::dialect::Dialect;

use dialect::PyDialect;

use pyo3::exceptions::PyValueError;

use pyo3::prelude::*;

use crate::sql::logical::PyLogicalPlan;

#[pyclass(

from_py_object,

frozen,

name = "Unparser",

module = "datafusion.unparser",

subclass

)]

#[derive(Clone)]

pub struct PyUnparser {

dialect: Arc<dyn Dialect>,

pretty: bool,

}

#[pymethods]

impl PyUnparser {

#[new]

pub fn new(dialect: PyDialect) -> Self {

Self {

dialect: dialect.dialect.clone(),

pretty: false,

}

}

pub fn plan_to_sql(&self, plan: &PyLogicalPlan) -> PyResult<String> {

let mut unparser = Unparser::new(self.dialect.as_ref());

unparser = unparser.with_pretty(self.pretty);

let sql = unparser

.plan_to_sql(&plan.plan())

.map_err(|e| PyValueError::new_err(e.to_string()))?;

Ok(sql.to_string())

}

pub fn with_pretty(&self, pretty: bool) -> Self {

Self {

dialect: self.dialect.clone(),

pretty,

}

}

}

pub(crate) fn init_module(m: &Bound<'_, PyModule>) -> PyResult<()> {

m.add_class::<PyUnparser>()?;

m.add_class::<PyDialect>()?;

Ok(())

}