import matplotlib
import matplotlib.pyplot as plt
from SecondaryValue import SecondaryValue
from scipy.constants import hbar, c, electron_volt
import numpy as np

###############################################################################
#                                   Utility                                   #
###############################################################################

def gev_to_pb(xs):
    """Converts a cross section from 1/GeV^2 to pb."""
    return xs/(electron_volt**2)*(hbar*c)**2*1e22

def tex_value(val, unit='', prefix='', prec=10, err=None):
    """Generates LaTeX output of a value with units and error."""

    val = np.round(val, prec)
    return fr'\({prefix}\SI{{{val}}}{{{unit}}}\)'

###############################################################################
#                                  Plot Porn                                  #
###############################################################################

matplotlib.rcParams.update({
    'font.family': 'serif',
    'text.usetex': False,
    'pgf.rcfonts': False,
})

def pinmp_ticks(axis, ticks):
    axis.set_major_locator(ticker.MaxNLocator(ticks))
    axis.set_minor_locator(ticker.MaxNLocator(ticks*10))
    return axis

def set_up_plot(ticks=10, pimp_top=True, subplot=111, fig=None):
    if fig is None:
        fig = plt.figure()
    ax = fig.add_subplot(subplot)

    pinmp_ticks(ax.xaxis, ticks)
    pinmp_ticks(ax.yaxis, ticks)

    ax.grid(which='minor', alpha=.3)
    ax.grid(which='major', alpha=.5)


    if pimp_top:
        ax.tick_params(right=True, top=True, which='both')
    else:
        ax.tick_params(right=True, which='both')

    return fig, ax

def save_fig(fig, title, folder='unsorted', size=(5, 4)):
    fig.set_size_inches(*size)
    fig.tight_layout()
    try:
        os.makedirs(f'./figs/{folder}/')
    except OSError as exc:
        pass
    fig.savefig(f'./figs/{folder}/{title}.pdf')
    fig.savefig(f'./figs/{folder}/{title}.pgf')

    with open('./out/figlist.txt', 'a') as f:
        f.write(r'''
\begin{figure}[H]\centering
  \input{../auswertung/figs/'''
  + f'{folder}/{title}.pgf' +
  r'''}
  \caption{}
  \label{fig:''' + folder + '-' + title + r'''}
\end{figure}
    ''')