// 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.

use std::sync::Arc;

use datafusion::logical_expr::{DdlStatement, LogicalPlan, Statement};
use datafusion_proto::logical_plan::{AsLogicalPlan, DefaultLogicalExtensionCodec};
use prost::Message;
use pyo3::exceptions::PyRuntimeError;
use pyo3::prelude::*;
use pyo3::types::PyBytes;

use crate::context::PySessionContext;
use crate::errors::PyDataFusionResult;
use crate::expr::aggregate::PyAggregate;
use crate::expr::analyze::PyAnalyze;
use crate::expr::copy_to::PyCopyTo;
use crate::expr::create_catalog::PyCreateCatalog;
use crate::expr::create_catalog_schema::PyCreateCatalogSchema;
use crate::expr::create_external_table::PyCreateExternalTable;
use crate::expr::create_function::PyCreateFunction;
use crate::expr::create_index::PyCreateIndex;
use crate::expr::create_memory_table::PyCreateMemoryTable;
use crate::expr::create_view::PyCreateView;
use crate::expr::describe_table::PyDescribeTable;
use crate::expr::distinct::PyDistinct;
use crate::expr::dml::PyDmlStatement;
use crate::expr::drop_catalog_schema::PyDropCatalogSchema;
use crate::expr::drop_function::PyDropFunction;
use crate::expr::drop_table::PyDropTable;
use crate::expr::drop_view::PyDropView;
use crate::expr::empty_relation::PyEmptyRelation;
use crate::expr::explain::PyExplain;
use crate::expr::extension::PyExtension;
use crate::expr::filter::PyFilter;
use crate::expr::join::PyJoin;
use crate::expr::limit::PyLimit;
use crate::expr::logical_node::LogicalNode;
use crate::expr::projection::PyProjection;
use crate::expr::recursive_query::PyRecursiveQuery;
use crate::expr::repartition::PyRepartition;
use crate::expr::sort::PySort;
use crate::expr::statement::{
    PyDeallocate, PyExecute, PyPrepare, PyResetVariable, PySetVariable, PyTransactionEnd,
    PyTransactionStart,
};
use crate::expr::subquery::PySubquery;
use crate::expr::subquery_alias::PySubqueryAlias;
use crate::expr::table_scan::PyTableScan;
use crate::expr::union::PyUnion;
use crate::expr::unnest::PyUnnest;
use crate::expr::values::PyValues;
use crate::expr::window::PyWindowExpr;

#[pyclass(
    from_py_object,
    frozen,
    name = "LogicalPlan",
    module = "datafusion",
    subclass,
    eq
)]
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct PyLogicalPlan {
    pub(crate) plan: Arc<LogicalPlan>,
}

impl PyLogicalPlan {
    /// creates a new PyLogicalPlan
    pub fn new(plan: LogicalPlan) -> Self {
        Self {
            plan: Arc::new(plan),
        }
    }

    pub fn plan(&self) -> Arc<LogicalPlan> {
        self.plan.clone()
    }
}

#[pymethods]
impl PyLogicalPlan {
    /// Return the specific logical operator
    pub fn to_variant<'py>(&self, py: Python<'py>) -> PyResult<Bound<'py, PyAny>> {
        match self.plan.as_ref() {
            LogicalPlan::Aggregate(plan) => PyAggregate::from(plan.clone()).to_variant(py),
            LogicalPlan::Analyze(plan) => PyAnalyze::from(plan.clone()).to_variant(py),
            LogicalPlan::Distinct(plan) => PyDistinct::from(plan.clone()).to_variant(py),
            LogicalPlan::EmptyRelation(plan) => PyEmptyRelation::from(plan.clone()).to_variant(py),
            LogicalPlan::Explain(plan) => PyExplain::from(plan.clone()).to_variant(py),
            LogicalPlan::Extension(plan) => PyExtension::from(plan.clone()).to_variant(py),
            LogicalPlan::Filter(plan) => PyFilter::from(plan.clone()).to_variant(py),
            LogicalPlan::Join(plan) => PyJoin::from(plan.clone()).to_variant(py),
            LogicalPlan::Limit(plan) => PyLimit::from(plan.clone()).to_variant(py),
            LogicalPlan::Projection(plan) => PyProjection::from(plan.clone()).to_variant(py),
            LogicalPlan::Sort(plan) => PySort::from(plan.clone()).to_variant(py),
            LogicalPlan::TableScan(plan) => PyTableScan::from(plan.clone()).to_variant(py),
            LogicalPlan::Subquery(plan) => PySubquery::from(plan.clone()).to_variant(py),
            LogicalPlan::SubqueryAlias(plan) => PySubqueryAlias::from(plan.clone()).to_variant(py),
            LogicalPlan::Unnest(plan) => PyUnnest::from(plan.clone()).to_variant(py),
            LogicalPlan::Window(plan) => PyWindowExpr::from(plan.clone()).to_variant(py),
            LogicalPlan::Repartition(plan) => PyRepartition::from(plan.clone()).to_variant(py),
            LogicalPlan::Union(plan) => PyUnion::from(plan.clone()).to_variant(py),
            LogicalPlan::Statement(plan) => match plan {
                Statement::TransactionStart(plan) => {
                    PyTransactionStart::from(plan.clone()).to_variant(py)
                }
                Statement::TransactionEnd(plan) => {
                    PyTransactionEnd::from(plan.clone()).to_variant(py)
                }
                Statement::SetVariable(plan) => PySetVariable::from(plan.clone()).to_variant(py),
                Statement::ResetVariable(plan) => {
                    PyResetVariable::from(plan.clone()).to_variant(py)
                }
                Statement::Prepare(plan) => PyPrepare::from(plan.clone()).to_variant(py),
                Statement::Execute(plan) => PyExecute::from(plan.clone()).to_variant(py),
                Statement::Deallocate(plan) => PyDeallocate::from(plan.clone()).to_variant(py),
            },
            LogicalPlan::Values(plan) => PyValues::from(plan.clone()).to_variant(py),
            LogicalPlan::Dml(plan) => PyDmlStatement::from(plan.clone()).to_variant(py),
            LogicalPlan::Ddl(plan) => match plan {
                DdlStatement::CreateExternalTable(plan) => {
                    PyCreateExternalTable::from(plan.clone()).to_variant(py)
                }
                DdlStatement::CreateMemoryTable(plan) => {
                    PyCreateMemoryTable::from(plan.clone()).to_variant(py)
                }
                DdlStatement::CreateView(plan) => PyCreateView::from(plan.clone()).to_variant(py),
                DdlStatement::CreateCatalogSchema(plan) => {
                    PyCreateCatalogSchema::from(plan.clone()).to_variant(py)
                }
                DdlStatement::CreateCatalog(plan) => {
                    PyCreateCatalog::from(plan.clone()).to_variant(py)
                }
                DdlStatement::CreateIndex(plan) => PyCreateIndex::from(plan.clone()).to_variant(py),
                DdlStatement::DropTable(plan) => PyDropTable::from(plan.clone()).to_variant(py),
                DdlStatement::DropView(plan) => PyDropView::from(plan.clone()).to_variant(py),
                DdlStatement::DropCatalogSchema(plan) => {
                    PyDropCatalogSchema::from(plan.clone()).to_variant(py)
                }
                DdlStatement::CreateFunction(plan) => {
                    PyCreateFunction::from(plan.clone()).to_variant(py)
                }
                DdlStatement::DropFunction(plan) => {
                    PyDropFunction::from(plan.clone()).to_variant(py)
                }
            },
            LogicalPlan::Copy(plan) => PyCopyTo::from(plan.clone()).to_variant(py),
            LogicalPlan::DescribeTable(plan) => PyDescribeTable::from(plan.clone()).to_variant(py),
            LogicalPlan::RecursiveQuery(plan) => {
                PyRecursiveQuery::from(plan.clone()).to_variant(py)
            }
        }
    }

    /// Get the inputs to this plan
    fn inputs(&self) -> Vec<PyLogicalPlan> {
        let mut inputs = vec![];
        for input in self.plan.inputs() {
            inputs.push(input.to_owned().into());
        }
        inputs
    }

    fn __repr__(&self) -> PyResult<String> {
        Ok(format!("{:?}", self.plan))
    }

    fn display(&self) -> String {
        format!("{}", self.plan.display())
    }

    fn display_indent(&self) -> String {
        format!("{}", self.plan.display_indent())
    }

    fn display_indent_schema(&self) -> String {
        format!("{}", self.plan.display_indent_schema())
    }

    fn display_graphviz(&self) -> String {
        format!("{}", self.plan.display_graphviz())
    }

    pub fn to_proto<'py>(&'py self, py: Python<'py>) -> PyDataFusionResult<Bound<'py, PyBytes>> {
        let codec = DefaultLogicalExtensionCodec {};
        let proto =
            datafusion_proto::protobuf::LogicalPlanNode::try_from_logical_plan(&self.plan, &codec)?;

        let bytes = proto.encode_to_vec();
        Ok(PyBytes::new(py, &bytes))
    }

    #[staticmethod]
    pub fn from_proto(
        ctx: PySessionContext,
        proto_msg: Bound<'_, PyBytes>,
    ) -> PyDataFusionResult<Self> {
        let bytes: &[u8] = proto_msg.extract().map_err(Into::<PyErr>::into)?;
        let proto_plan =
            datafusion_proto::protobuf::LogicalPlanNode::decode(bytes).map_err(|e| {
                PyRuntimeError::new_err(format!(
                    "Unable to decode logical node from serialized bytes: {e}"
                ))
            })?;

        let codec = DefaultLogicalExtensionCodec {};
        let plan = proto_plan.try_into_logical_plan(&ctx.ctx.task_ctx(), &codec)?;
        Ok(Self::new(plan))
    }
}

impl From<PyLogicalPlan> for LogicalPlan {
    fn from(logical_plan: PyLogicalPlan) -> LogicalPlan {
        logical_plan.plan.as_ref().clone()
    }
}

impl From<LogicalPlan> for PyLogicalPlan {
    fn from(logical_plan: LogicalPlan) -> PyLogicalPlan {
        PyLogicalPlan {
            plan: Arc::new(logical_plan),
        }
    }
}
