oxivgl 0.1.1

// SPDX-License-Identifier: MIT OR Apache-2.0
use core::{ops::Deref, ptr::null_mut};

use oxivgl_sys::*;

use super::{
    WidgetError,
    obj::{AsLvHandle, Obj},
};

/// Type-safe wrapper for `lv_chart_type_t`.
#[repr(u32)]
#[derive(Clone, Copy, Debug)]
pub enum ChartType {
    /// Don't draw the series.
    None = lv_chart_type_t_LV_CHART_TYPE_NONE,
    /// Connect points with lines.
    Line = lv_chart_type_t_LV_CHART_TYPE_LINE,
    /// Connect points with smooth curves.
    Curve = lv_chart_type_t_LV_CHART_TYPE_CURVE,
    /// Draw columns.
    Bar = lv_chart_type_t_LV_CHART_TYPE_BAR,
    /// Stacked bars.
    Stacked = lv_chart_type_t_LV_CHART_TYPE_STACKED,
    /// Draw points and lines in 2D (x,y coordinates).
    Scatter = lv_chart_type_t_LV_CHART_TYPE_SCATTER,
}

/// Chart data update mode.
#[repr(u32)]
#[derive(Clone, Copy, Debug)]
pub enum ChartUpdateMode {
    /// Shift old data left, add new at end.
    Shift = lv_chart_update_mode_t_LV_CHART_UPDATE_MODE_SHIFT,
    /// Circular — overwrite oldest points.
    Circular = lv_chart_update_mode_t_LV_CHART_UPDATE_MODE_CIRCULAR,
}

/// Type-safe wrapper for `lv_chart_axis_t`.
#[repr(u32)]
#[derive(Clone, Copy, Debug)]
pub enum ChartAxis {
    /// Primary Y axis.
    PrimaryY = 0x00,
    /// Secondary Y axis.
    SecondaryY = 0x01,
    /// Primary X axis.
    PrimaryX = 0x02,
    /// Secondary X axis.
    SecondaryX = 0x04,
}

/// Opaque handle to a chart data series.
///
/// Returned by [`Chart::add_series`]. The series is owned by LVGL and freed
/// when the parent chart is deleted.
#[derive(Debug)]
pub struct ChartSeries {
    ptr: *mut lv_chart_series_t,
}

/// Opaque handle to a chart cursor.
///
/// Returned by [`Chart::add_cursor`]. The cursor is owned by LVGL and freed
/// when the parent chart is deleted.
#[derive(Debug)]
pub struct ChartCursor {
    ptr: *mut lv_chart_cursor_t,
}

/// Sentinel value indicating "no point" (e.g., gap in data).
/// Equivalent to LVGL's `LV_CHART_POINT_NONE` (0x7FFFFFFF).
pub const CHART_POINT_NONE: u32 = 0x7FFF_FFFF;

/// LVGL chart widget — line, bar, or scatter plots.
#[derive(Debug)]
pub struct Chart<'p> {
    obj: Obj<'p>,
}

impl<'p> AsLvHandle for Chart<'p> {
    fn lv_handle(&self) -> *mut lv_obj_t {
        self.obj.lv_handle()
    }
}

impl<'p> Deref for Chart<'p> {
    type Target = Obj<'p>;
    fn deref(&self) -> &Obj<'p> {
        &self.obj
    }
}

impl<'p> Chart<'p> {
    /// Create a new chart widget.
    pub fn new(parent: &impl AsLvHandle) -> Result<Self, WidgetError> {
        let parent_ptr = parent.lv_handle();
        assert_ne!(parent_ptr, null_mut(), "Parent widget cannot be null");
        // SAFETY: parent_ptr non-null (asserted above); lv_init() called via
        // LvglDriver.
        let handle = unsafe { lv_chart_create(parent_ptr) };
        if handle.is_null() { Err(WidgetError::LvglNullPointer) } else { Ok(Chart { obj: Obj::from_raw(handle) }) }
    }

    /// Set the chart type (line, bar, scatter, or none).
    pub fn set_type(&self, t: ChartType) -> &Self {
        // SAFETY: lv_handle() is non-null (checked in new()).
        unsafe { lv_chart_set_type(self.lv_handle(), t as lv_chart_type_t) };
        self
    }

    /// Set the number of data points per series.
    pub fn set_point_count(&self, count: u32) -> &Self {
        // SAFETY: lv_handle() is non-null (checked in new()).
        unsafe { lv_chart_set_point_count(self.lv_handle(), count) };
        self
    }

    /// Set the value range for a given axis.
    pub fn set_axis_range(&self, axis: ChartAxis, min: i32, max: i32) -> &Self {
        // SAFETY: lv_handle() is non-null (checked in new()).
        unsafe { lv_chart_set_axis_range(self.lv_handle(), axis as lv_chart_axis_t, min, max) };
        self
    }

    /// Add a data series bound to the given axis. Returns a handle for
    /// subsequent value operations.
    pub fn add_series(&self, color: lv_color_t, axis: ChartAxis) -> ChartSeries {
        // SAFETY: lv_handle() is non-null (checked in new()).
        let ptr = unsafe { lv_chart_add_series(self.lv_handle(), color, axis as lv_chart_axis_t) };
        assert!(!ptr.is_null(), "lv_chart_add_series returned NULL");
        ChartSeries { ptr }
    }

    /// Set a specific point's x/y values by index (scatter plots).
    pub fn set_series_value_by_id2(&self, series: &ChartSeries, id: u32, x: i32, y: i32) -> &Self {
        // SAFETY: lv_handle() and series.ptr are non-null (created by LVGL).
        unsafe { lv_chart_set_series_value_by_id2(self.lv_handle(), series.ptr, id, x, y) };
        self
    }

    /// Append the next value to a series (shift mode).
    pub fn set_next_value(&self, series: &ChartSeries, value: i32) -> &Self {
        // SAFETY: lv_handle() and series.ptr are non-null (created by LVGL).
        unsafe { lv_chart_set_next_value(self.lv_handle(), series.ptr, value) };
        self
    }

    /// Append the next x/y value pair to a series (scatter, shift mode).
    pub fn set_next_value2(&self, series: &ChartSeries, x: i32, y: i32) -> &Self {
        // SAFETY: lv_handle() and series.ptr are non-null (created by LVGL).
        unsafe { lv_chart_set_next_value2(self.lv_handle(), series.ptr, x, y) };
        self
    }

    /// Set a specific point's Y value by index.
    pub fn set_series_value_by_id(&self, series: &ChartSeries, id: u32, value: i32) -> &Self {
        // SAFETY: lv_handle() and series.ptr are non-null (created by LVGL).
        unsafe { lv_chart_set_series_value_by_id(self.lv_handle(), series.ptr, id, value) };
        self
    }

    /// Get a mutable pointer to the Y data array for a series.
    ///
    /// # Safety
    /// The returned pointer is valid for `get_point_count()` elements. The
    /// caller must not write beyond the array bounds or use the pointer after
    /// the chart or series is freed.
    pub unsafe fn get_series_y_array(&self, series: &ChartSeries) -> *mut i32 {
        // SAFETY: lv_handle() and series.ptr are non-null (created by LVGL).
        unsafe { lv_chart_get_series_y_array(self.lv_handle(), series.ptr) }
    }

    /// Get the pixel offset of the first data point from the chart edge.
    pub fn get_first_point_center_offset(&self) -> i32 {
        // SAFETY: lv_handle() is non-null (checked in new()).
        unsafe { lv_chart_get_first_point_center_offset(self.lv_handle()) }
    }

    /// Get the current number of data points per series.
    pub fn get_point_count(&self) -> u32 {
        // SAFETY: lv_handle() is non-null (checked in new()).
        unsafe { lv_chart_get_point_count(self.lv_handle()) }
    }

    /// Set the number of horizontal and vertical division lines.
    pub fn set_div_line_count(&self, hdiv: u32, vdiv: u32) -> &Self {
        // SAFETY: lv_handle() is non-null (checked in new()).
        unsafe { lv_chart_set_div_line_count(self.lv_handle(), hdiv, vdiv) };
        self
    }

    /// Set the update mode (shift or circular).
    pub fn set_update_mode(&self, mode: ChartUpdateMode) -> &Self {
        // SAFETY: lv_handle() is non-null (checked in new()).
        unsafe { lv_chart_set_update_mode(self.lv_handle(), mode as lv_chart_update_mode_t) };
        self
    }

    /// Get the start-point index for a series (circular mode).
    pub fn get_x_start_point(&self, series: &ChartSeries) -> u32 {
        // SAFETY: lv_handle() and series.ptr are non-null.
        unsafe { lv_chart_get_x_start_point(self.lv_handle(), series.ptr) }
    }

    /// Add a cursor crosshair to the chart.
    pub fn add_cursor(&self, color: lv_color_t, dir: u32) -> ChartCursor {
        // SAFETY: lv_handle() is non-null.
        let ptr = unsafe { lv_chart_add_cursor(self.lv_handle(), color, dir) };
        assert!(!ptr.is_null(), "lv_chart_add_cursor returned NULL");
        ChartCursor { ptr }
    }

    /// Move a cursor to the given point index.
    ///
    /// Pass `series` as `None` to use the first series.
    pub fn set_cursor_point(&self, cursor: &ChartCursor, series: Option<&ChartSeries>, point_id: u32) -> &Self {
        let ser_ptr = match series {
            Some(s) => s.ptr,
            None => core::ptr::null_mut(),
        };
        // SAFETY: lv_handle() and cursor.ptr are non-null.
        unsafe { lv_chart_set_cursor_point(self.lv_handle(), cursor.ptr, ser_ptr, point_id) };
        self
    }

    /// Get the index of the last pressed data point.
    ///
    /// Returns `None` if no point is pressed (`LV_CHART_POINT_NONE`).
    pub fn get_pressed_point(&self) -> Option<u32> {
        // SAFETY: lv_handle() is non-null.
        let id = unsafe { lv_chart_get_pressed_point(self.lv_handle()) };
        if id == CHART_POINT_NONE { None } else { Some(id) }
    }

    /// Get the next series after `prev`, or the first series if `prev` is `None`.
    pub fn get_series_next(&self, prev: Option<&ChartSeries>) -> Option<ChartSeries> {
        let prev_ptr = match prev {
            Some(s) => s.ptr,
            None => core::ptr::null_mut(),
        };
        // SAFETY: lv_handle() is non-null.
        let ptr = unsafe { lv_chart_get_series_next(self.lv_handle(), prev_ptr) };
        if ptr.is_null() { None } else { Some(ChartSeries { ptr }) }
    }

    /// Get the current chart type.
    pub fn get_type(&self) -> ChartType {
        // SAFETY: lv_handle() is non-null (checked in new()).
        let raw = unsafe { lv_chart_get_type(self.lv_handle()) };
        match raw {
            x if x == lv_chart_type_t_LV_CHART_TYPE_LINE => ChartType::Line,
            x if x == lv_chart_type_t_LV_CHART_TYPE_CURVE => ChartType::Curve,
            x if x == lv_chart_type_t_LV_CHART_TYPE_BAR => ChartType::Bar,
            x if x == lv_chart_type_t_LV_CHART_TYPE_STACKED => ChartType::Stacked,
            x if x == lv_chart_type_t_LV_CHART_TYPE_SCATTER => ChartType::Scatter,
            _ => ChartType::None,
        }
    }

    /// Get the current data update mode.
    pub fn get_update_mode(&self) -> ChartUpdateMode {
        // SAFETY: lv_handle() is non-null (checked in new()).
        let raw = unsafe { lv_chart_get_update_mode(self.lv_handle()) };
        if raw == lv_chart_update_mode_t_LV_CHART_UPDATE_MODE_CIRCULAR {
            ChartUpdateMode::Circular
        } else {
            ChartUpdateMode::Shift
        }
    }

    /// Get the number of horizontal division lines.
    pub fn get_hor_div_line_count(&self) -> u32 {
        // SAFETY: lv_handle() is non-null (checked in new()).
        unsafe { lv_chart_get_hor_div_line_count(self.lv_handle()) }
    }

    /// Get the number of vertical division lines.
    pub fn get_ver_div_line_count(&self) -> u32 {
        // SAFETY: lv_handle() is non-null (checked in new()).
        unsafe { lv_chart_get_ver_div_line_count(self.lv_handle()) }
    }

    /// Refresh the chart — call after externally modifying series data.
    pub fn refresh(&self) -> &Self {
        // SAFETY: lv_handle() is non-null (checked in new()).
        unsafe { lv_chart_refresh(self.lv_handle()) };
        self
    }
}