#!/usr/bin/env python

"""
Contains functions used to test the ArduPilot build_options.py structures

AP_FLAKE8_CLEAN
"""

from __future__ import print_function


import os

from pysim import util


class TestBuildOptions(object):
    def __init__(self):
        self.sizes_nothing_disabled = None

    # swiped from app.py:
    def get_build_options_from_ardupilot_tree(self):
        '''return a list of build options'''
        import importlib.util
        spec = importlib.util.spec_from_file_location(
            "build_options.py",
            os.path.join(os.path.dirname(os.path.realpath(__file__)),
                         '..', 'scripts', 'build_options.py'))
        mod = importlib.util.module_from_spec(spec)
        spec.loader.exec_module(mod)
        return mod.BUILD_OPTIONS

    def write_defines_to_file(self, defines, filepath):
        lines = []
        lines.extend(["undef %s\n" % (a, ) for (a, b) in defines.items()])
        lines.extend(["define %s %s\n" % (a, b) for (a, b) in defines.items()])
        content = "".join(lines)
        with open(filepath, "w") as f:
            f.write(content)

    def get_defines(self, feature, options):
        '''returns a hash of (name, value) defines to turn feature off -
        recursively gets dependencies'''
        ret = {
            feature.define: 0,
        }
        if feature.dependency is None:
            return ret
        for depname in feature.dependency.split(','):
            dep = None
            for f in options:
                if f.label == depname:
                    dep = f
            if dep is None:
                raise ValueError("Invalid dep (%s)" % dep)
            ret.update(self.get_defines(dep, options))
        return ret

    def test_feature(self, feature, options):
        # defines = self.get_defines(feature, options)
        defines = {
            feature.define: 0,
        }
        self.test_compile_with_defines(defines)

    def build_targets(self):
        '''return a list of build targets'''
        return ['copter', 'plane', 'rover', 'antennatracker', 'sub', 'blimp']

    def board(self):
        '''returns board to build for'''
        return "CubeOrange"

    def test_compile_with_defines(self, defines):
        extra_hwdef_filepath = "/tmp/extra.hwdef"
        self.write_defines_to_file(defines, extra_hwdef_filepath)
        util.waf_configure(
            self.board(),
            extra_hwdef=extra_hwdef_filepath,
        )
        for t in self.build_targets():
            try:
                util.run_cmd([util.relwaf(), t])
            except Exception:
                print("Failed to build (%s) with things disabled" %
                      (t,))
                raise

    def find_build_sizes(self):
        '''returns a hash with size of all build targets'''
        ret = {}
        target_to_binpath = {
            "copter": "arducopter",
            "plane": "arduplane",
            "rover": "ardurover",
            "antennatracker": "antennatracker",
            "sub": "ardusub",
            "blimp": "blimp",
        }
        for target in self.build_targets():
            path = os.path.join("build", self.board(), "bin", "%s.bin" % target_to_binpath[target])
            ret[target] = os.path.getsize(path)
        return ret

    def disable_in_turn_check_sizes(self, feature, sizes_nothing_disabled):
        current_sizes = self.find_build_sizes()
        for (build, new_size) in current_sizes.items():
            old_size = sizes_nothing_disabled[build]
            print("Disabling %s(%s) on %s saves %u bytes" %
                  (feature.label, feature.define, build, old_size - new_size))

    def run_disable_in_turn(self):
        options = self.get_build_options_from_ardupilot_tree()
        count = 1
        for feature in options:
            print("##### Disabling feature %s(%s) (%u/%u)" %
                  (feature.label, feature.define, count, len(options)))
            self.test_feature(feature, options)
            count += 1
            self.disable_in_turn_check_sizes(feature, self.sizes_nothing_disabled)

    def run_disable_all(self):
        options = self.get_build_options_from_ardupilot_tree()
        defines = {}
        for feature in options:
            defines[feature.define] = 0
        self.test_compile_with_defines(defines)

    def run_disable_none(self):
        self.test_compile_with_defines({})
        self.sizes_nothing_disabled = self.find_build_sizes()

    def run(self):
        self.run_disable_all()
        self.run_disable_none()
        self.run_disable_in_turn()


if __name__ == '__main__':
    tbo = TestBuildOptions()
    tbo.run()