rustdx 0.4.4

受 pytdx 启发的 A 股数据获取库
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use crate::{
    file::gbbq::{Factor, Fq, Gbbq},
    Error::Custom,
    Result,
};
use std::path::Path;

/// 注意：成交量的单位为 “手”，而不是股。在通达信和交易所数据里，单位为股。
#[derive(Debug, Clone, serde::Serialize)]
pub struct Day {
    pub date: String,
    pub code: String,
    pub open: f32,
    pub high: f32,
    pub low: f32,
    pub close: f32,
    pub amount: f32,
    pub vol: f32,
    pub preclose: f64,
    pub factor: f64,
}

impl Day {
    pub fn new(code: u32, p: impl AsRef<Path>, gbbqs: Option<&[Gbbq]>) -> Result<Vec<Self>> {
        let raw = std::fs::read(p)?;
        let days = raw
            .chunks_exact(32)
            .map(|b| super::Day::from_bytes(code, b));
        let fq = gbbqs
            .map(|g| Fq::new(days.clone(), g))
            .unwrap_or(Fq::no_gbbq(days.clone()))
            .ok_or(Custom("复权失败"))?
            .into_iter()
            .filter(|d| d.trading);
        Ok(days
            .zip(fq)
            .map(|(d, f)| Self {
                date: crate::bytes_helper::date_string(d.date),
                code: format!("{:06}", d.code),
                open: d.open,
                high: d.high,
                low: d.low,
                close: d.close,
                amount: d.amount,
                vol: d.vol as f32 / 100.,
                preclose: f.preclose,
                factor: f.factor,
            })
            .collect())
    }

    pub fn concat(
        code: u32,
        p: impl AsRef<Path>,
        gbbqs: Option<&[Gbbq]>,
        f: Option<&Factor>,
    ) -> Result<Vec<Self>> {
        let raw = std::fs::read(p)?;
        let days = raw
            .chunks_exact(32)
            .map(|b| super::Day::from_bytes(code, b));
        let (preclose, factor) = f.map(|f| (f.preclose, f.factor)).unwrap_or((
            days.clone()
                .next()
                .ok_or(Custom("初始化前收盘价失败"))?
                .close as f64,
            1.,
        ));
        let fq = gbbqs
            .map(|g| Fq::concat(days.clone(), g, preclose, factor))
            .unwrap_or(Fq::no_gbbq(days.clone()))
            .ok_or(Custom("复权失败"))?
            .into_iter()
            .filter(|d| d.trading);
        Ok(days
            .zip(fq)
            .map(|(d, f)| Self {
                date: crate::bytes_helper::date_string(d.date),
                code: format!("{:06}", d.code),
                open: d.open,
                high: d.high,
                low: d.low,
                close: d.close,
                amount: d.amount,
                vol: d.vol as f32 / 100.,
                preclose: f.preclose,
                factor: f.factor,
            })
            .collect())
    }
}