#!/usr/bin/env python
# Copyright 2015 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

"""Create a JSON file containing PCI ID-to-name mappings for Intel GPUs.

This script uses upstream Mesa to get the latest PCI ID list.
The list is used by get_gpu_family() in site_utils.py.
This script should be run occasionally to keep the list up-to-date.
"""

import json
import shutil
import subprocess as sp
import tempfile


def map_gpu_name(mesa_name):
    """Map Mesa GPU names to autotest names.
    """
    family_name_map = {
        'Pineview': 'pinetrail',
        'Ironlake': 'ironlake',
        'Sandybridge': 'sandybridge',
        'Ivybridge': 'ivybridge',
        'Haswell': 'haswell',
        'Bay Trail': 'baytrail',
        'Broadwell': 'broadwell',
        'Cherryview': 'braswell',
        'Skylake': 'skylake',
        'Broxton': 'broxton',
        'Kabylake': 'kabylake'
    }

    for name in family_name_map:
        if name in mesa_name:
            return family_name_map[name]
    return ''


def main():
    """Extract Intel GPU PCI IDs from upstream Mesa and write to JSON file.
    """

    in_files = ['i915_pci_ids.h', 'i965_pci_ids.h']
    out_file = 'intel_pci_ids.json'
    remote_repo = 'http://anongit.freedesktop.org/git/mesa/mesa.git'
    local_repo = tempfile.mkdtemp()

    pci_ids = {}

    cmd = 'git clone --no-checkout --depth 1 %s %s' % (remote_repo, local_repo)

    try:
        sp.check_call(cmd, shell=True)
    except sp.CalledProcessError as err:
        print 'Cannot clone Mesa repo (%d)' % err.returncode
        exit()

    chipsets = []
    cmd = 'cd %s; git show HEAD:include/pci_ids/' % local_repo
    for id_file in in_files:
        chipsets.extend(sp.check_output(cmd + id_file,
                                        shell=True).splitlines())
    shutil.rmtree(local_repo)

    for cset in chipsets:
        cset_attr = cset[len('CHIPSET('):-2].split(',')

        # Remove leading and trailing spaces and double quotes.
        for i in range(0, len(cset_attr)):
            cset_attr[i] = cset_attr[i].strip(' "').rstrip(' "')

        pci_id = cset_attr[0].lower()
        family_name = map_gpu_name(cset_attr[2])

        # Ignore GPU families not in family_name_map.
        if family_name:
            pci_ids[pci_id] = family_name

    with open(out_file, 'w') as out_f:
        json.dump(pci_ids, out_f, sort_keys=True, indent=4,
                  separators=(',', ': '))


if __name__ == '__main__':
    main()