from __future__ import print_function
from __future__ import absolute_import

# System modules
import os

# Third-party modules

# LLDB modules
import lldb
from .lldbtest import *
from . import lldbutil

def source_type(filename):
    _, extension = os.path.splitext(filename)
    return {
        '.c' : 'C_SOURCES',
        '.cpp' : 'CXX_SOURCES',
        '.cxx' : 'CXX_SOURCES',
        '.cc' : 'CXX_SOURCES',
        '.m' : 'OBJC_SOURCES',
        '.mm' : 'OBJCXX_SOURCES'
    }.get(extension, None)


class CommandParser:
    def __init__(self):
        self.breakpoints = []

    def parse_one_command(self, line):
        parts = line.split('//%')

        command = None
        new_breakpoint = True

        if len(parts) == 2:
            command = parts[1].strip()  # take off whitespace
            new_breakpoint = parts[0].strip() != ""

        return (command, new_breakpoint)

    def parse_source_files(self, source_files):
        for source_file in source_files:
            file_handle = open(source_file)
            lines = file_handle.readlines()
            line_number = 0
            current_breakpoint = None # non-NULL means we're looking through whitespace to find additional commands
            for line in lines:
                line_number = line_number + 1 # 1-based, so we do this first
                (command, new_breakpoint) = self.parse_one_command(line)

                if new_breakpoint:
                    current_breakpoint = None

                if command != None:
                    if current_breakpoint == None:
                        current_breakpoint = {}
                        current_breakpoint['file_name'] = source_file
                        current_breakpoint['line_number'] = line_number
                        current_breakpoint['command'] = command
                        self.breakpoints.append(current_breakpoint)
                    else:
                        current_breakpoint['command'] = current_breakpoint['command'] + "\n" + command

    def set_breakpoints(self, target):
        for breakpoint in self.breakpoints:
            breakpoint['breakpoint'] = target.BreakpointCreateByLocation(breakpoint['file_name'], breakpoint['line_number'])

    def handle_breakpoint(self, test, breakpoint_id):
        for breakpoint in self.breakpoints:
            if breakpoint['breakpoint'].GetID() == breakpoint_id:
                test.execute_user_command(breakpoint['command'])
                return

class InlineTest(TestBase):
    # Internal implementation

    def getRerunArgs(self):
        # The -N option says to NOT run a if it matches the option argument, so
        # if we are using dSYM we say to NOT run dwarf (-N dwarf) and vice versa.
        if self.using_dsym is None:
            # The test was skipped altogether.
            return ""
        elif self.using_dsym:
            return "-N dwarf %s" % (self.mydir)
        else:
            return "-N dsym %s" % (self.mydir)

    def BuildMakefile(self):
        if os.path.exists("Makefile"):
            return

        categories = {}

        for f in os.listdir(os.getcwd()):
            t = source_type(f)
            if t:
                if t in list(categories.keys()):
                    categories[t].append(f)
                else:
                    categories[t] = [f]

        makefile = open("Makefile", 'w+')

        level = os.sep.join([".."] * len(self.mydir.split(os.sep))) + os.sep + "make"

        makefile.write("LEVEL = " + level + "\n")

        for t in list(categories.keys()):
            line = t + " := " + " ".join(categories[t])
            makefile.write(line + "\n")

        if ('OBJCXX_SOURCES' in list(categories.keys())) or ('OBJC_SOURCES' in list(categories.keys())):
            makefile.write("LDFLAGS = $(CFLAGS) -lobjc -framework Foundation\n")

        if ('CXX_SOURCES' in list(categories.keys())):
            makefile.write("CXXFLAGS += -std=c++11\n")

        makefile.write("\ncleanup:\n\trm -f Makefile *.d\n\n")
        makefile.write("include $(LEVEL)/Makefile.rules\n")
        makefile.flush()
        makefile.close()

    @skipUnlessDarwin
    def __test_with_dsym(self):
        self.using_dsym = True
        self.BuildMakefile()
        self.buildDsym()
        self.do_test()

    def __test_with_dwarf(self):
        self.using_dsym = False
        self.BuildMakefile()
        self.buildDwarf()
        self.do_test()

    def __test_with_dwo(self):
        self.using_dsym = False
        self.BuildMakefile()
        self.buildDwo()
        self.do_test()

    def execute_user_command(self, __command):
        exec(__command, globals(), locals())

    def do_test(self):
        exe_name = "a.out"
        exe = os.path.join(os.getcwd(), exe_name)
        source_files = [ f for f in os.listdir(os.getcwd()) if source_type(f) ]
        target = self.dbg.CreateTarget(exe)

        parser = CommandParser()
        parser.parse_source_files(source_files)
        parser.set_breakpoints(target)

        process = target.LaunchSimple(None, None, os.getcwd())

        while lldbutil.get_stopped_thread(process, lldb.eStopReasonBreakpoint):
            thread = lldbutil.get_stopped_thread(process, lldb.eStopReasonBreakpoint)
            breakpoint_id = thread.GetStopReasonDataAtIndex (0)
            parser.handle_breakpoint(self, breakpoint_id)
            process.Continue()


    # Utilities for testcases

    def check_expression (self, expression, expected_result, use_summary = True):
        value = self.frame().EvaluateExpression (expression)
        self.assertTrue(value.IsValid(), expression+"returned a valid value")
        if self.TraceOn():
            print(value.GetSummary())
            print(value.GetValue())
        if use_summary:
            answer = value.GetSummary()
        else:
            answer = value.GetValue()
        report_str = "%s expected: %s got: %s"%(expression, expected_result, answer)
        self.assertTrue(answer == expected_result, report_str)

def ApplyDecoratorsToFunction(func, decorators):
    tmp = func
    if type(decorators) == list:
        for decorator in decorators:
            tmp = decorator(tmp)
    elif hasattr(decorators, '__call__'):
        tmp = decorators(tmp)
    return tmp
    

def MakeInlineTest(__file, __globals, decorators=None):
    # Derive the test name from the current file name
    file_basename = os.path.basename(__file)
    InlineTest.mydir = TestBase.compute_mydir(__file)

    test_name, _ = os.path.splitext(file_basename)
    # Build the test case 
    test = type(test_name, (InlineTest,), {'using_dsym': None})
    test.name = test_name

    test.test_with_dsym = ApplyDecoratorsToFunction(test._InlineTest__test_with_dsym, decorators)
    test.test_with_dwarf = ApplyDecoratorsToFunction(test._InlineTest__test_with_dwarf, decorators)
    test.test_with_dwo = ApplyDecoratorsToFunction(test._InlineTest__test_with_dwo, decorators)

    # Add the test case to the globals, and hide InlineTest
    __globals.update({test_name : test})

    # Store the name of the originating file.o
    test.test_filename = __file
    return test

