import pathlib
import argparse
import configparser
import logging
import sys

import numpy as np
import pandas as pd

try:
    import matplotlib.pyplot as plt
except ImportError:
    plt = None


parser = argparse.ArgumentParser(description="Pre-process bathymetry")
parser.add_argument("-v", "--verbose", action="count", default=0)
args = parser.parse_args()

logging.basicConfig(level=max((10, 20 - 10 * args.verbose)))
log = logging.getLogger("bathy")

log.info("Starting bathymetry pre-processing")
config = configparser.ConfigParser()
config.read("config.ini")

root = pathlib.Path(config.get("data", "root"))

log.info(f"Reading input data from '{root}'")
bathy_hires = np.loadtxt(root.joinpath(config.get("data", "hires")))
bathy_lores = np.loadtxt(root.joinpath(config.get("data", "bathy")))
hstru = np.loadtxt(root.joinpath(config.get("data", "hstru")))
poro = np.loadtxt(root.joinpath(config.get("data", "poro")))
psize = np.loadtxt(root.joinpath(config.get("data", "psize")))

log.info("Generating grid")
x_hires = np.arange(-0.5 * bathy_hires.size, 0, 0.5)
x_lores = np.arange(-1 * bathy_lores.size, 0, 1)
x_hstru = np.arange(-0.5 * hstru.size, 0, 0.5)

log.info("Generating output data")
bathy_hires_pd = pd.Series(bathy_hires.copy(), index=x_hires)
bathy_lores_pd = pd.Series(bathy_lores.copy(), index=x_lores)

bathy = pd.DataFrame(
    index=bathy_lores_pd.index.union(bathy_hires_pd.index),
    columns=("z", "hstru", "poro", "psize"),
    data=0,
)
bathy.z[bathy_lores_pd.index] = bathy_lores_pd
bathy.z[bathy_hires_pd.index] = bathy_hires_pd

bathy.loc[x_hstru, ("hstru", "poro", "psize")] = np.array(
    (hstru, poro, psize)
).T

bathy = bathy.reindex(bathy_lores_pd.index)
log.debug(f"Bathymetry:\n{bathy}")
log.info(
    f"xmin: {bathy.index.min()}, "
    f"xmax: {bathy.index.max()}, "
    f"n: {bathy.index.size}"
)

if config.has_section("out"):
    out = pathlib.Path(config.get("out", "root"))
    log.info(f"Writing output data to '{out}'")
    np.savetxt(out.joinpath("bathy.dat"), bathy.z, newline=" ")
    np.savetxt(out.joinpath("hstru.dat"), bathy.hstru, newline=" ")
    np.savetxt(out.joinpath("poro.dat"), bathy.poro, newline=" ")
    np.savetxt(out.joinpath("psize.dat"), bathy.psize, newline=" ")

    bathy.to_hdf(out.joinpath("bathy.h5"), "bathy", mode="w")

if config.getboolean("proc", "plot", fallback=False):
    if plt is None:
        log.error("Could not import PyPlot")
        sys.exit(1)

    log.info("Plotting data")

    fig, ax = plt.subplots()
    ax.plot(x_hires, bathy_hires, label="High-res")
    ax.plot(x_lores, bathy_lores, label="Low-res")
    ax.plot(bathy.index, bathy.z, ls="-.", c="k", label="Combined")
    ax.plot(bathy.index, bathy.hstru, label="Hstru")
    ax.plot(bathy.index, bathy.poro, label="Poro")
    ax.plot(bathy.index, bathy.psize, label="Psize")

    ax.grid()
    ax.legend()
    plt.show(block=True)

log.info("Processing finished")