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use crate::matrix::Matrix;
use crate::matrix::MatrixError;
use crate::number::c64;
use lapack::{dgetrf, zgetrf};

impl Matrix {
  /// # LU decomposition
  /// for f64
  pub fn getrf(self) -> Result<(Matrix, Vec<i32>), MatrixError> {
    let m = self.rows;
    let n = self.cols;
    let mut ipiv = vec![0; m.min(n)];
    let mut info = 0;

    let mut slf = self;
    let m = m as i32;
    let n = n as i32;

    unsafe {
      dgetrf(n, m, &mut slf.elems, n, &mut ipiv, &mut info);
    }

    match info {
      0 => Ok((slf, ipiv)),
      _ => Err(MatrixError::LapackRoutineError {
        routine: "dgetrf".to_owned(),
        info,
      }),
    }
  }
}

impl Matrix<c64> {
  /// # LU decomposition
  /// for c64
  pub fn getrf(self) -> Result<(Matrix<c64>, Vec<i32>), MatrixError> {
    let m = self.rows;
    let n = self.cols;
    let mut ipiv = vec![0; m.min(n)];
    let mut info = 0;

    let mut slf = self;
    let m = m as i32;
    let n = n as i32;

    unsafe {
      zgetrf(n, m, &mut slf.elems, n, &mut ipiv, &mut info);
    }

    match info {
      0 => Ok((slf, ipiv)),
      _ => Err(MatrixError::LapackRoutineError {
        routine: "zgetrf".to_owned(),
        info,
      }),
    }
  }
}