import sys
import os
import shutil
import multiprocessing
import SCons.Util

## Configuration

opts = Variables('Local.sc')

opts.AddVariables(
    ("CC", "C Compiler"),
    ("CXX", "C++ Compiler"),
    ("AS", "Assembler"),
    ("LINK", "Linker"),
    ("AR", "Archiver"),
    ("RANLIB", "Archiver Indexer"),
    ("BUILDTYPE", "Build type (RELEASE, DEBUG, or PERF)", "RELEASE"),
    ("VERBOSE", "Show full build information (0 or 1)", "0"),
    ("NUMCPUS", "Number of CPUs to use for build (0 means auto).", "0"),
    ("WITH_GPROF", "Include gprof profiling (0 or 1).", "0"),
    ("PREFIX", "Installation target directory.", "#pxelinux"),
    ("ARCH", "Target Architecture", "amd64"),
    ("BOOTDISK", "Build boot disk (0 or 1)", "0"),
    ("BOOTDISK_SIZE", "Boot disk size", "128")
)

env = Environment(options = opts,
                  tools = ['default'],
                  ENV = os.environ)
Help(opts.GenerateHelpText(env))

# Copy environment variables
if os.environ.has_key('CC'):
    env["CC"] = os.getenv('CC')
if os.environ.has_key('CXX'):
    env["CXX"] = os.getenv('CXX')
if os.environ.has_key('AS'):
    env["AS"] = os.getenv('AS')
if os.environ.has_key('LD'):
    env["LINK"] = os.getenv('LD')
if os.environ.has_key('AR'):
    env["AR"] = os.getenv('AR')
if os.environ.has_key('RANLIB'):
    env["RANLIB"] = os.getenv('RANLIB')
if os.environ.has_key('CFLAGS'):
    env.Append(CCFLAGS = SCons.Util.CLVar(os.environ['CFLAGS']))
if os.environ.has_key('CPPFLAGS'):
    env.Append(CPPFLAGS = SCons.Util.CLVar(os.environ['CPPFLAGS']))
if os.environ.has_key('CXXFLAGS'):
    env.Append(CXXFLAGS = SCons.Util.CLVar(os.environ['CXXFLAGS']))
if os.environ.has_key('LDFLAGS'):
    env.Append(LINKFLAGS = SCons.Util.CLVar(os.environ['LDFLAGS']))

#env.Append(CPPFLAGS = [ "-Wall", "-Wformat=2", "-Wextra", "-Wwrite-strings",
#                        "-Wno-unused-parameter", "-Wmissing-format-attribute",
#                        "-Werror" ])
env.Append(CFLAGS = [ "-Wshadow", "-Wno-typedef-redefinition" ])
#env.Append(CXXFLAGS = [ "-Wno-non-template-friend", "-Woverloaded-virtual",
#                        "-Wcast-qual", "-Wcast-align", "-Wconversion",
#                        "-Weffc++", "-std=c++0x", "-Werror" ])

if env["WITH_GPROF"] == "1":
    env.Append(CPPFLAGS = [ "-pg" ])
    env.Append(LINKFLAGS = [ "-pg" ])

if env["BUILDTYPE"] == "DEBUG":
    env.Append(CPPFLAGS = [ "-g", "-DDEBUG", "-Wall", 
        "-Wno-deprecated-declarations" ])
    env.Append(LINKFLAGS = [ "-g", "-rdynamic" ])
elif env["BUILDTYPE"] == "PERF":
    env.Append(CPPFLAGS = [ "-g", "-DNDEBUG", "-Wall", "-O2"])
    env.Append(LDFLAGS = [ "-g", "-rdynamic" ])
elif env["BUILDTYPE"] == "RELEASE":
    env.Append(CPPFLAGS = ["-DNDEBUG", "-Wall", "-O2"])
else:
    print "Error BUILDTYPE must be RELEASE or DEBUG"
    sys.exit(-1)

if env["ARCH"] != "amd64":
    print "Unsupported architecture: " + env["ARCH"]
    sys.exit(-1)

try:
    hf = open(".git/HEAD", 'r')
    head = hf.read()
    if head.startswith("ref: "):
        if head.endswith("\n"):
            head = head[0:-1]
        with open(".git/" + head[5:]) as bf:
            branch = bf.read()
            if branch.endswith("\n"):
                branch = branch[0:-1]
            env.Append(CPPFLAGS = [ "-DGIT_VERSION=\\\"" + branch + "\\\""])
except IOError:
    pass

if env["VERBOSE"] == "0":
    env["CCCOMSTR"] = "Compiling $SOURCE"
    env["CXXCOMSTR"] = "Compiling $SOURCE"
    env["SHCCCOMSTR"] = "Compiling $SOURCE"
    env["SHCXXCOMSTR"] = "Compiling $SOURCE"
    env["ARCOMSTR"] = "Creating library $TARGET"
    env["RANLIBCOMSTR"] = "Indexing library $TARGET"
    env["LINKCOMSTR"] = "Linking $TARGET"
    env["ASCOMSTR"] = "Assembling $TARGET"
    env["ASPPCOMSTR"] = "Assembling $TARGET"
    env["ARCOMSTR"] = "Archiving $TARGET"
    env["RANLIBCOMSTR"] = "Indexing $TARGET"

def GetNumCPUs(env):
    if env["NUMCPUS"] != "0":
        return int(env["NUMCPUS"])
    return 2*multiprocessing.cpu_count()

env.SetOption('num_jobs', GetNumCPUs(env))

def CopyTree(dst, src, env):
    def DirCopyHelper(src, dst):
	for f in os.listdir(src):
	    srcPath = os.path.join(src, f)
	    dstPath = os.path.join(dst, f)
	    if os.path.isdir(srcPath):
		if not os.path.exists(dstPath):
		    os.makedirs(dstPath)
		DirCopyHelper(srcPath, dstPath)
	    else:
		env.Command(dstPath, srcPath, Copy("$TARGET", "$SOURCE"))
    if (not os.path.exists(dst)):
	os.makedirs(dst)
    DirCopyHelper(src, dst)

# XXX: Hack to support clang static analyzer
def CheckFailed():
    if os.getenv('CCC_ANALYZER_OUTPUT_FORMAT') != None:
        return
    Exit(1)

# Configuration
conf = env.Configure()

if not conf.CheckCC():
    print 'Your C compiler and/or environment is incorrectly configured.'
    CheckFailed()

if not conf.CheckCXX():
    print 'Your C++ compiler and/or environment is incorrectly configured.'
    CheckFailed()

conf.Finish()

Export('env')

# Debugging Tools

# Create include tree
CopyTree('build/include', 'include', env)
CopyTree('build/include/sys', 'sys/include', env)
CopyTree('build/include/machine', 'sys/' + env['ARCH'] + '/include', env)

# Build Targets
SConscript('sys/SConscript', variant_dir='build/sys')
SConscript('lib/libc/SConscript', variant_dir='build/lib/libc')
SConscript('bin/shell/SConscript', variant_dir='build/bin/shell')
SConscript('sbin/init/SConscript', variant_dir='build/sbin/init')
SConscript('tests/SConscript', variant_dir='build/tests')

# Build Tools
env["TOOLCHAINBUILD"] = "TRUE"
env["CC"] = "cc"
env["CXX"] = "c++"
env["LINK"] = "cc"
SConscript('sbin/newfs_o2fs/SConscript', variant_dir='build/tools/newfs_o2fs')

# Install Targets
env.Install('$PREFIX/','build/sys/castor')
env.Alias('install','$PREFIX')

# Boot Disk Target
if env["BOOTDISK"] == "1":
    newfs = Builder(action = 'build/tools/newfs_o2fs/newfs_o2fs -s $BOOTDISK_SIZE -m $SOURCE $TARGET')
    env.Append(BUILDERS = {'BuildImage' : newfs})
    bootdisk = env.BuildImage('#build/bootdisk.img', '#release/bootdisk.manifest')
    Depends(bootdisk, "#build/tools/newfs_o2fs/newfs_o2fs")
    Depends(bootdisk, "#build/bin/shell/shell")
    Depends(bootdisk, "#build/sbin/init/init")
    Depends(bootdisk, "#build/sys/castor")
    Depends(bootdisk, "#build/tests/threadtest")
    env.Alias('bootdisk', '#build/bootdisk.img')
    env.Install('$PREFIX/','#build/bootdisk.img')