from __future__ import print_function

import argparse
import os
import pwd
import datetime
import sys

import requests
import tables
import numpy as np
import pymzml

DEBUG = False


class Spectrum(tables.IsDescription):
    mz = tables.Float32Col(pos=0)
    rt = tables.Float32Col(pos=1)
    i = tables.Float32Col(pos=2)
    polarity = tables.UInt8Col(pos=3)
    ms_level = tables.UInt8Col(pos=4)
    precursor_MZ = tables.Float32Col(pos=5)
    precursor_intensity = tables.Float32Col(pos=6)
    collision_energy = tables.Float32Col(pos=7)


def read_spectrum(spectrum):
    """Read a single spectrum

    Parameters
    ----------
    spectrum : mzML spectrum
        The mzML spectrum to parse.

    Returns
    -------
    out : list of tuples
        List of values associated with each peak in the spectrum.
    """
    polarity = 'positive scan' in spectrum or 'MS:1000130' in spectrum
    ms_level = spectrum['ms level']
    rt = spectrum.get('scan start time', spectrum['MS:1000016'])[0]

    precursor_MZ = 0.0
    precursor_intensity = 0.0
    collision_energy = 0.0

    if ms_level == 2:
        collision_energy = spectrum.get('collision energy',
                                        spectrum['MS:1000045'])[1]
        if 'peak intensity' in spectrum or 'MS:1000042' in spectrum:
            precursor_intensity = spectrum.get('peak intensity',
                                               spectrum['MS:1000042'])[1]
        precursor_MZ = spectrum.get('selected ion m/z',
                                        spectrum['MS:1000744'])[0]

    return [(mz, rt, i, polarity, ms_level,
             precursor_MZ, precursor_intensity, collision_energy)
            for (mz, i) in spectrum.peaks]


def mzml_to_hdf(in_file_name, out_file_name=None, debug=False):
    """Converts in_file (mzml) to binary and stores it in out_file
    """
    if not out_file_name:
        out_file_name = in_file_name.replace('.mzML', '.h5')

    FILTERS = tables.Filters(complib='lzo', complevel=1)
    out_file = tables.open_file(out_file_name, "w", filters=FILTERS)

    table = out_file.create_table('/', 'spectra', description=Spectrum)

    debug = debug or DEBUG
    if debug:
        print("STATUS: Converting %s to %s (mzML to HDF)" %
              (in_file_name, out_file_name), end='')

    # Extra accessions for pymzml to read
    extraAccessions = [
        ('MS:1000016', ['value', 'unitName']),  # scan start time
        ('MS:1000129', ['name']),  # negative scan
        ('MS:1000130', ['name']),  # positive scan
        ('MS:1000744', ['name', 'value']),  # selected ion m/z
        ('MS:1000042', ['name', 'value']),  # peak intensity
        ('MS:1000045', ['name', 'value']),  # collision energy
    ]

    try:
        mzml_reader = pymzml.run.Reader(in_file_name,
                                        extraAccessions=extraAccessions)
    except Exception:
        raise TypeError('Not a valid mzML file: "%s"' % in_file_name)

    for (ind, spectrum) in enumerate(mzml_reader):
        try:
            rows = read_spectrum(spectrum)
        except (KeyError, TypeError):
            continue
        except Exception as e:
            print(e.message)
            continue

        table.append(rows)
        table.flush()

        if debug and not (ind % 100):
            sys.stdout.write('.')
            sys.stdout.flush()

    out_file.set_node_attr('/', "upload_date", datetime.datetime.utcnow())
    out_file.set_node_attr('/', "uploaded_by",
                           pwd.getpwuid(os.getuid())[0])

    if debug:
        print('\nSaving file')
    out_file.close()
    if debug:
        print("STATUS: Finished mzML to HDF conversion")

    return out_file_name


def get_test_data():
    dname = os.path.dirname(__file__)
    path = os.path.join(dname, 'test.mzML')

    # TODO: add tests for these other files
    url = ("https://www.dropbox.com/s/3w83p0gjpnghqzs/QExactive_FastPolaritySwitching_Mixture_of_32_and_64_bit.mzML.xml?dl=1")

    url = ("https://www.dropbox.com/s/wzq7ykc436cj4ic/QExactive_Targeted_MSMS_Pos.mzML.xml?dl=1")

    url = ("https://www.dropbox.com/s/59ypkfhjgvzplm4/QExactive_Wrong_FileFormat.mzXML.xml?dl=1")

    url = ("https://www.dropbox.com/s/j54q5amle7nyl5h/021715_QC_6_neg.mzML?dl=1")

    if not os.path.exists(path):
        # NOTE the stream=True parameter
        print('Downloading: %s\n' % url, file=sys.stderr)
        r = requests.get(url, stream=True)
        with open(path, 'wb') as f:
            for chunk in r.iter_content(chunk_size=1024):
                if chunk:  # filter out keep-alive new chunks
                    f.write(chunk)
                    f.flush()

        print('Download complete\n', file=sys.stderr)
    else:
        print("File already exists: %s" % path)

    return path


def main():
    parser = argparse.ArgumentParser(description="Load mzml files to HDF")
    parser.add_argument("-o", "--output", type=str,
                        help="Output file name", required=False)
    parser.add_argument("-i", "--input", type=str,
                        help="Input mzML file", required=True)
    parser.add_argument("-d", "--debug", help="Sets debug mode",
                        action="store_true")

    args = parser.parse_args()

    mzml_to_hdf(args.input, args.output, args.debug)


if __name__ == '__main__':  # pragma : no cover
    main()
    #get_test_data()

@@ -4161,32 +4161,129 @@
 XML.xml?dl=1%22)%0A%0A
+    url = (%22https://www.dropbox.com/s/lfm3tgajw26mos2/Agilent_MS1_64bit_encoded.mzML.xml?dl=1%22)%0A%0A
     url = (%22http

Add link to agilent dropbox