#!/usr/bin/env python3

import argparse
import errno
import shutil
import subprocess
import sys
import os
from itertools import chain
from pathlib import Path

lvgl_test_dir = os.path.dirname(os.path.realpath(__file__))
lvgl_script_path = os.path.join(lvgl_test_dir, "../scripts")
sys.path.append(lvgl_script_path)

from LVGLImage import LVGLImage, ColorFormat, CompressMethod

# Key values must match variable names in CMakeLists.txt.
build_only_options = {
#    'OPTIONS_NORMAL_8BIT': 'Normal config, 8 bit color depth',
    'OPTIONS_16BIT': 'Minimal config, 16 bit color depth',
    'OPTIONS_24BIT': 'Normal config, 24 bit color depth',
    'OPTIONS_FULL_32BIT': 'Full config, 32 bit color depth',
    'OPTIONS_VG_LITE': 'VG-Lite simulator with full config, 32 bit color depth',
}

test_options = {
    'OPTIONS_TEST_SYSHEAP': 'Test config, system heap, 32 bit color depth',
    'OPTIONS_TEST_DEFHEAP': 'Test config, LVGL heap, 32 bit color depth',
}


def get_option_description(option_name):
    if option_name in build_only_options:
        return build_only_options[option_name]
    return test_options[option_name]


def delete_dir_ignore_missing(dir_path):
    '''Recursively delete a directory and ignore if missing.'''
    try:
        shutil.rmtree(dir_path)
    except FileNotFoundError:
        pass


def options_abbrev(options_name):
    '''Return an abbreviated version of the option name.'''
    prefix = 'OPTIONS_'
    assert options_name.startswith(prefix)
    return options_name[len(prefix):].lower()


def get_base_build_dir(options_name):
    '''Given the build options name, return the build directory name.

    Does not return the full path to the directory - just the base name.'''
    return 'build_%s' % options_abbrev(options_name)


def get_build_dir(options_name):
    '''Given the build options name, return the build directory name.

    Returns absolute path to the build directory.'''
    global lvgl_test_dir
    return os.path.join(lvgl_test_dir, get_base_build_dir(options_name))


def build_tests(options_name, build_type, clean):
    '''Build all tests for the specified options name.'''
    global lvgl_test_dir

    print()
    print()
    label = 'Building: %s: %s' % (options_abbrev(
        options_name), get_option_description(options_name))
    print('=' * len(label))
    print(label)
    print('=' * len(label))
    print(flush=True)

    build_dir = get_build_dir(options_name)
    if clean:
        delete_dir_ignore_missing(build_dir)

    os.chdir(lvgl_test_dir)
    created_build_dir = False
    if not os.path.isdir(build_dir):
        os.mkdir(build_dir)
        created_build_dir = True
    os.chdir(build_dir)
    if created_build_dir:
        subprocess.check_call(['cmake', '-GNinja', '-DCMAKE_BUILD_TYPE=%s' % build_type,
                               '-D%s=1' % options_name, '..'])
    subprocess.check_call(['cmake', '--build', build_dir,
                           '--parallel', str(os.cpu_count())])


def run_tests(options_name, test_suite):
    '''Run the tests for the given options name.'''

    print()
    print()
    label = 'Running tests for %s' % options_abbrev(options_name)
    print('=' * len(label))
    print(label)
    print('=' * len(label), flush=True)

    os.chdir(get_build_dir(options_name))
    args = [
        'ctest',
        '--timeout', '300',
        '--parallel', str(os.cpu_count()),
        '--output-on-failure',
    ]
    if test_suite is not None:
        args.extend(["--tests-regex", test_suite])
    subprocess.check_call(args)


def generate_code_coverage_report():
    '''Produce code coverage test reports for the test execution.'''
    global lvgl_test_dir

    print()
    print()
    label = 'Generating code coverage reports'
    print('=' * len(label))
    print(label)
    print('=' * len(label))
    print(flush=True)

    os.chdir(lvgl_test_dir)
    delete_dir_ignore_missing('report')
    os.mkdir('report')
    root_dir = os.pardir
    html_report_file = 'report/index.html'
    cmd = ['gcovr', '--root', root_dir, '--html-details', '--output',
           html_report_file, '--xml', 'report/coverage.xml',
           '-j', str(os.cpu_count()), '--print-summary',
           '--html-title', 'LVGL Test Coverage', '--filter', '../src/.*/lv_.*\.c']

    subprocess.check_call(cmd)
    print("Done: See %s" % html_report_file, flush=True)


def generate_test_images():
    invalids = (ColorFormat.UNKNOWN,)
    formats = [i for i in ColorFormat if i not in invalids]
    png_path = os.path.join(lvgl_test_dir, "test_images/pngs")
    pngs = list(Path(png_path).rglob("*.[pP][nN][gG]"))
    print(f"png files: {pngs}")

    align_options = [1, 64]

    for align in align_options:
        for compress in CompressMethod:
            compress_name = compress.name if compress != CompressMethod.NONE else "UNCOMPRESSED"
            outputs = os.path.join(lvgl_test_dir, f"test_images/stride_align{align}/{compress_name}/")
            os.makedirs(outputs, exist_ok=True)
            for fmt in formats:
                for png in pngs:
                    img = LVGLImage().from_png(png, cf=fmt, background=0xffffff)
                    img.adjust_stride(align=16)
                    output = os.path.join(outputs, f"{Path(png).stem}_{fmt.name}.bin")
                    img.to_bin(output, compress=compress)
                    output = os.path.join(outputs, f"{Path(png).stem}_{fmt.name}_{compress.name}_align{align}.c")
                    img.to_c_array(output, compress=compress)
                    print(f"converting {os.path.basename(png)}, format: {fmt.name}, compress: {compress_name}")


if __name__ == "__main__":
    epilog = '''This program builds and optionally runs the LVGL test programs.
    There are two types of LVGL tests: "build", and "test". The build-only
    tests, as their name suggests, only verify that the program successfully
    compiles and links (with various build options). There are also a set of
    tests that execute to verify correct LVGL library behavior.
    '''
    parser = argparse.ArgumentParser(
        description='Build and/or run LVGL tests.', epilog=epilog)
    parser.add_argument('--build-options', nargs=1,
                        choices=list(chain(build_only_options, test_options)),
                        help='''the build option name to build or run. When
                        omitted all build configurations are used.
                        ''')
    parser.add_argument('--clean', action='store_true', default=False,
                        help='clean existing build artifacts before operation.')
    parser.add_argument('--report', action='store_true',
                        help='generate code coverage report for tests.')
    parser.add_argument('actions', nargs='*', choices=['build', 'test'],
                        help='build: compile build tests, test: compile/run executable tests.')
    parser.add_argument('--test-suite', default=None,
                        help='select test suite to run')
    parser.add_argument('--update-image', action='store_true', default=False,
                        help='Update test image using LVGLImage.py script')

    args = parser.parse_args()

    if args.update_image:
        generate_test_images()

    if args.build_options:
        options_to_build = args.build_options
    else:
        if 'build' in args.actions:
            if 'test' in args.actions:
                options_to_build = {**build_only_options, **test_options}
            else:
                options_to_build = build_only_options
        else:
            options_to_build = test_options

    for options_name in options_to_build:
        is_test = options_name in test_options
        build_type = 'Debug'
        build_tests(options_name, build_type, args.clean)
        if is_test:
            try:
                run_tests(options_name, args.test_suite)
            except subprocess.CalledProcessError as e:
                sys.exit(e.returncode)

    if args.report:
        generate_code_coverage_report()
