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// 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.

//! Benchmark derived from TPC-H. This is not an official TPC-H benchmark.

use arrow::datatypes::SchemaBuilder;
use datafusion::{
    arrow::datatypes::{DataType, Field, Schema},
    common::plan_err,
    error::Result,
};
use std::fs;
mod run;
pub use run::RunOpt;

pub const TPCH_TABLES: &[&str] = &[
    "part", "supplier", "partsupp", "customer", "orders", "lineitem", "nation", "region",
];

pub const TPCH_QUERY_START_ID: usize = 1;
pub const TPCH_QUERY_END_ID: usize = 22;

/// The `.tbl` file contains a trailing column
pub fn get_tbl_tpch_table_schema(table: &str) -> Schema {
    let mut schema = SchemaBuilder::from(get_tpch_table_schema(table).fields);
    schema.push(Field::new("__placeholder", DataType::Utf8, false));
    schema.finish()
}

/// Get the schema for the benchmarks derived from TPC-H
pub fn get_tpch_table_schema(table: &str) -> Schema {
    // note that the schema intentionally uses signed integers so that any generated Parquet
    // files can also be used to benchmark tools that only support signed integers, such as
    // Apache Spark

    match table {
        "part" => Schema::new(vec![
            Field::new("p_partkey", DataType::Int64, false),
            Field::new("p_name", DataType::Utf8, false),
            Field::new("p_mfgr", DataType::Utf8, false),
            Field::new("p_brand", DataType::Utf8, false),
            Field::new("p_type", DataType::Utf8, false),
            Field::new("p_size", DataType::Int32, false),
            Field::new("p_container", DataType::Utf8, false),
            Field::new("p_retailprice", DataType::Decimal128(15, 2), false),
            Field::new("p_comment", DataType::Utf8, false),
        ]),

        "supplier" => Schema::new(vec![
            Field::new("s_suppkey", DataType::Int64, false),
            Field::new("s_name", DataType::Utf8, false),
            Field::new("s_address", DataType::Utf8, false),
            Field::new("s_nationkey", DataType::Int64, false),
            Field::new("s_phone", DataType::Utf8, false),
            Field::new("s_acctbal", DataType::Decimal128(15, 2), false),
            Field::new("s_comment", DataType::Utf8, false),
        ]),

        "partsupp" => Schema::new(vec![
            Field::new("ps_partkey", DataType::Int64, false),
            Field::new("ps_suppkey", DataType::Int64, false),
            Field::new("ps_availqty", DataType::Int32, false),
            Field::new("ps_supplycost", DataType::Decimal128(15, 2), false),
            Field::new("ps_comment", DataType::Utf8, false),
        ]),

        "customer" => Schema::new(vec![
            Field::new("c_custkey", DataType::Int64, false),
            Field::new("c_name", DataType::Utf8, false),
            Field::new("c_address", DataType::Utf8, false),
            Field::new("c_nationkey", DataType::Int64, false),
            Field::new("c_phone", DataType::Utf8, false),
            Field::new("c_acctbal", DataType::Decimal128(15, 2), false),
            Field::new("c_mktsegment", DataType::Utf8, false),
            Field::new("c_comment", DataType::Utf8, false),
        ]),

        "orders" => Schema::new(vec![
            Field::new("o_orderkey", DataType::Int64, false),
            Field::new("o_custkey", DataType::Int64, false),
            Field::new("o_orderstatus", DataType::Utf8, false),
            Field::new("o_totalprice", DataType::Decimal128(15, 2), false),
            Field::new("o_orderdate", DataType::Date32, false),
            Field::new("o_orderpriority", DataType::Utf8, false),
            Field::new("o_clerk", DataType::Utf8, false),
            Field::new("o_shippriority", DataType::Int32, false),
            Field::new("o_comment", DataType::Utf8, false),
        ]),

        "lineitem" => Schema::new(vec![
            Field::new("l_orderkey", DataType::Int64, false),
            Field::new("l_partkey", DataType::Int64, false),
            Field::new("l_suppkey", DataType::Int64, false),
            Field::new("l_linenumber", DataType::Int32, false),
            Field::new("l_quantity", DataType::Decimal128(15, 2), false),
            Field::new("l_extendedprice", DataType::Decimal128(15, 2), false),
            Field::new("l_discount", DataType::Decimal128(15, 2), false),
            Field::new("l_tax", DataType::Decimal128(15, 2), false),
            Field::new("l_returnflag", DataType::Utf8, false),
            Field::new("l_linestatus", DataType::Utf8, false),
            Field::new("l_shipdate", DataType::Date32, false),
            Field::new("l_commitdate", DataType::Date32, false),
            Field::new("l_receiptdate", DataType::Date32, false),
            Field::new("l_shipinstruct", DataType::Utf8, false),
            Field::new("l_shipmode", DataType::Utf8, false),
            Field::new("l_comment", DataType::Utf8, false),
        ]),

        "nation" => Schema::new(vec![
            Field::new("n_nationkey", DataType::Int64, false),
            Field::new("n_name", DataType::Utf8, false),
            Field::new("n_regionkey", DataType::Int64, false),
            Field::new("n_comment", DataType::Utf8, false),
        ]),

        "region" => Schema::new(vec![
            Field::new("r_regionkey", DataType::Int64, false),
            Field::new("r_name", DataType::Utf8, false),
            Field::new("r_comment", DataType::Utf8, false),
        ]),

        _ => unimplemented!(),
    }
}

/// Get the SQL statements from the specified query file
pub fn get_query_sql(query: usize) -> Result<Vec<String>> {
    if query > 0 && query < 23 {
        let possibilities = vec![
            format!("queries/q{query}.sql"),
            format!("benchmarks/queries/q{query}.sql"),
        ];
        let mut errors = vec![];
        for filename in possibilities {
            match fs::read_to_string(&filename) {
                Ok(contents) => {
                    return Ok(contents
                        .split(';')
                        .map(|s| s.trim())
                        .filter(|s| !s.is_empty())
                        .map(|s| s.to_string())
                        .collect());
                }
                Err(e) => errors.push(format!("{filename}: {e}")),
            };
        }
        plan_err!("invalid query. Could not find query: {:?}", errors)
    } else {
        plan_err!("invalid query. Expected value between 1 and 22")
    }
}

pub const QUERY_LIMIT: [Option<usize>; 22] = [
    None,
    Some(100),
    Some(10),
    None,
    None,
    None,
    None,
    None,
    None,
    Some(20),
    None,
    None,
    None,
    None,
    None,
    None,
    None,
    Some(100),
    None,
    None,
    Some(100),
    None,
];
