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use crate::common::validate_inputs;
pub use crate::indicator_types::TIndicatorState;
use crate::types::{DisplayGroup, DisplayType, IndicatorError, IndicatorType, Info};
use serde::{Deserialize, Serialize};
/// Number of input price series required by this indicator.
pub const INPUTS_WIDTH: usize = 3;
/// Number of option parameters required by this indicator.
pub const OPTIONS_WIDTH: usize = 0;
/// SIMD-parallel variant that processes `N` assets with identical options simultaneously.
/// Requires the `simd_assets` Cargo feature. See [`by_assets`] for the module form.
#[cfg(feature = "simd_assets")]
pub use crate::indicators::simd_indicators::marketfi_simd::indicator_by_assets;
/// Convenience module that re-exports [`indicator_by_assets`] as `indicator`,
/// allowing SIMD multi-asset computation to be used as a drop-in replacement
/// for the standard single-asset [`indicator`] function.
/// Requires the `simd_assets` Cargo feature.
#[cfg(feature = "simd_assets")]
pub mod by_assets {
/// Processes `N` assets in parallel with shared options.
/// See the parent module's [`super::indicator_by_assets`] for full documentation.
pub use crate::indicators::simd_indicators::marketfi_simd::indicator_by_assets as indicator;
}
#[derive(Serialize, Deserialize, Clone)]
pub struct IndicatorState;
impl TIndicatorState<3> for IndicatorState {
fn batch_indicator(
&mut self,
inputs: &[&[f64]; INPUTS_WIDTH],
_optional_outputs: Option<&[bool]>,
) -> Result<Vec<Vec<f64>>, IndicatorError> {
process(inputs)
}
}
/// Returns information about the Market Facilitation Index (MarketFI) indicator.
///
/// # Returns
///
/// An `Info` struct containing metadata about the MarketFI indicator.
pub const INFO: Info = Info {
name: "marketfi",
indicator_type: IndicatorType::Volume,
full_name: "Market Facilitation Index",
inputs: &["high", "low", "volume"],
options: &[],
outputs: &["marketfi"],
optional_outputs: &[],
display_groups: &[DisplayGroup {
offset: None,
id: "marketfi",
label: "MARKETFI",
display_type: DisplayType::Indicator,
outputs: &["marketfi"],
}],
};
/// Returns the minimum amount of data required for the MarketFI indicator.
///
/// # Arguments
///
/// * `options` - A slice containing the options for the MarketFI calculation.
///
/// # Returns
///
/// The minimum amount of data required.
pub fn min_data(_options: &[f64]) -> usize {
1
}
/// Calculates the output length for the MarketFI indicator.
///
/// # Arguments
///
/// * `data_len` - The length of the input data.
/// * `options` - A slice containing the options for the MarketFI calculation.
///
/// # Returns
///
/// The output length.
pub fn output_length(data_len: usize, _options: &[f64]) -> usize {
data_len
}
/// Calculates the Market Facilitation Index (MarketFI) indicator over the full input dataset.
///
/// # Inputs
///
/// * `inputs[0]` — high prices
/// * `inputs[1]` — low prices
/// * `inputs[2]` — volume
///
/// # Arguments
///
/// * `inputs` - Array of input price slices (see Inputs above).
/// * `options` - Unused; pass `&[]` (this indicator has no options).
/// * `optional_outputs` - Unused; this indicator has no optional outputs.
///
/// # Returns
///
/// `Ok((outputs, state))` where:
/// - `outputs[0]` — `marketfi`
///
/// `state` can be passed to `IndicatorState::batch_indicator` for streaming.
/// Returns `Err(IndicatorError)` if inputs are too short.
pub fn indicator(
inputs: &[&[f64]; INPUTS_WIDTH],
_options: &[f64; OPTIONS_WIDTH],
_optional_outputs: Option<&[bool]>,
) -> Result<(Vec<Vec<f64>>, IndicatorState), IndicatorError> {
let outputs = process(inputs)?;
Ok((outputs, IndicatorState))
}
//#[inline(always)]
fn process(inputs: &[&[f64]; INPUTS_WIDTH]) -> Result<Vec<Vec<f64>>, IndicatorError> {
validate_inputs(inputs, 1)?;
let high = inputs[0];
let low = inputs[1];
let volume = inputs[2];
let mut marketfi_line = crate::uninit_vec!(f64, high.len());
// Perform the main MarketFI calculation
for i in 0..high.len() {
unsafe {
*marketfi_line.get_unchecked_mut(i) = calc(
high.get_unchecked(i),
low.get_unchecked(i),
volume.get_unchecked(i),
)
};
}
Ok(vec![marketfi_line])
}
#[inline(always)]
pub fn calc(high: &f64, low: &f64, volume: &f64) -> f64 {
(high - low) / volume.max(f64::EPSILON)
}