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// 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
//
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// software distributed under the License is distributed on an
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// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

use crate::physical_plan::metrics::{
    Count, ExecutionPlanMetricsSet, MetricBuilder, Time,
};

/// Stores metrics about the parquet execution for a particular parquet file.
///
/// This component is a subject to **change** in near future and is exposed for low level integrations
/// through [ParquetFileReaderFactory].
#[derive(Debug, Clone)]
pub struct ParquetFileMetrics {
    /// Number of times the predicate could not be evaluated
    pub predicate_evaluation_errors: Count,
    /// Number of row groups pruned using
    pub row_groups_pruned: Count,
    /// Total number of bytes scanned
    pub bytes_scanned: Count,
    /// Total rows filtered out by predicates pushed into parquet scan
    pub pushdown_rows_filtered: Count,
    /// Total time spent evaluating pushdown filters
    pub pushdown_eval_time: Time,
    /// Total rows filtered out by parquet page index
    pub page_index_rows_filtered: Count,
    /// Total time spent evaluating parquet page index filters
    pub page_index_eval_time: Time,
}

impl ParquetFileMetrics {
    /// Create new metrics
    pub fn new(
        partition: usize,
        filename: &str,
        metrics: &ExecutionPlanMetricsSet,
    ) -> Self {
        let predicate_evaluation_errors = MetricBuilder::new(metrics)
            .with_new_label("filename", filename.to_string())
            .counter("predicate_evaluation_errors", partition);

        let row_groups_pruned = MetricBuilder::new(metrics)
            .with_new_label("filename", filename.to_string())
            .counter("row_groups_pruned", partition);

        let bytes_scanned = MetricBuilder::new(metrics)
            .with_new_label("filename", filename.to_string())
            .counter("bytes_scanned", partition);

        let pushdown_rows_filtered = MetricBuilder::new(metrics)
            .with_new_label("filename", filename.to_string())
            .counter("pushdown_rows_filtered", partition);

        let pushdown_eval_time = MetricBuilder::new(metrics)
            .with_new_label("filename", filename.to_string())
            .subset_time("pushdown_eval_time", partition);
        let page_index_rows_filtered = MetricBuilder::new(metrics)
            .with_new_label("filename", filename.to_string())
            .counter("page_index_rows_filtered", partition);

        let page_index_eval_time = MetricBuilder::new(metrics)
            .with_new_label("filename", filename.to_string())
            .subset_time("page_index_eval_time", partition);

        Self {
            predicate_evaluation_errors,
            row_groups_pruned,
            bytes_scanned,
            pushdown_rows_filtered,
            pushdown_eval_time,
            page_index_rows_filtered,
            page_index_eval_time,
        }
    }
}
