grafatui 0.1.7

A Grafana-like TUI for Prometheus
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/*
 * Copyright 2025 Federico D'Ambrosio
 *
 * Licensed 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 crate::app::{PanelState, YAxisMode};

pub(crate) fn calculate_y_bounds(p: &PanelState) -> [f64; 2] {
    let mut min = f64::MAX;
    let mut max = f64::MIN;
    let mut has_data = false;

    for s in &p.series {
        if !s.visible {
            continue;
        }
        for &(_, v) in &s.points {
            if !v.is_finite() {
                continue;
            }
            if v < min {
                min = v;
            }
            if v > max {
                max = v;
            }
            has_data = true;
        }
    }

    if !has_data {
        return [0.0, 1.0];
    }

    if min == max {
        min -= 1.0;
        max += 1.0;
    }

    if p.y_axis_mode == YAxisMode::ZeroBased {
        if min > 0.0 {
            min = 0.0;
        } else if max < 0.0 {
            max = 0.0;
        }
    }

    // Add some padding
    let range = max - min;
    [min - range * 0.05, max + range * 0.05]
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::app::SeriesView;

    fn create_test_panel() -> PanelState {
        PanelState {
            title: "test".to_string(),
            exprs: vec![],
            legends: vec![],
            series: vec![],
            last_error: None,
            last_url: None,
            last_samples: 0,
            grid: None,
            y_axis_mode: YAxisMode::Auto,
            panel_type: crate::app::PanelType::Graph,
            thresholds: None,
            min: None,
            max: None,
            autogrid: None,
        }
    }

    #[test]
    fn test_calculate_y_bounds_basic() {
        let mut p = create_test_panel();
        p.series.push(SeriesView {
            name: "test".to_string(),
            value: None,
            points: vec![(0.0, 10.0), (1.0, 20.0)],
            visible: true,
        });

        let bounds = calculate_y_bounds(&p);
        assert!(bounds[0] < 10.0);
        assert!(bounds[1] > 20.0);
    }

    #[test]
    fn test_calculate_y_bounds_nan() {
        let mut p = create_test_panel();
        p.series.push(SeriesView {
            name: "test".to_string(),
            value: None,
            points: vec![(0.0, 10.0), (1.0, f64::NAN), (2.0, 20.0)],
            visible: true,
        });

        let bounds = calculate_y_bounds(&p);
        assert!(bounds[0] < 10.0); // Should ignore NAN
        assert!(bounds[1] > 20.0);
    }

    #[test]
    fn test_calculate_y_bounds_infinity() {
        let mut p = create_test_panel();
        p.series.push(SeriesView {
            name: "test".to_string(),
            value: None,
            points: vec![(0.0, 10.0), (1.0, f64::INFINITY), (2.0, 20.0)],
            visible: true,
        });

        let bounds = calculate_y_bounds(&p);
        assert!(bounds[0] < 10.0); // Should ignore INFINITY
        assert!(bounds[1] > 20.0);
    }

    #[test]
    fn test_calculate_y_bounds_zero_based() {
        let mut p = create_test_panel();
        p.y_axis_mode = YAxisMode::ZeroBased;
        p.series.push(SeriesView {
            name: "test".to_string(),
            value: None,
            points: vec![(0.0, 10.0), (1.0, 20.0)],
            visible: true,
        });

        let bounds = calculate_y_bounds(&p);
        // Range is 0.0 to 20.0. Padding is 5% of 20.0 = 1.0.
        // So min should be 0.0 - 1.0 = -1.0.
        assert_eq!(bounds[0], -1.0);
        assert!(bounds[1] > 20.0);
    }
}