"""
See BENTO_BUILD.txt.

Caveats:

    - no automatic detection for BLAS/LAPACK/etc... You need to set it up
      manually for now (except on Mac OS X and Debian/Ubuntu). The upside is
      that it is extremely easy to do so
    - bento is still in flux, and some things may changes between releases.
"""
    
import os
import sys
import subprocess

# Ugly but necessary hack: import numpy here so that wscript in sub directories
# will see this numpy and not an already installed one
import __builtin__
__builtin__.__NUMPY_SETUP__ = True

from bento.commands import hooks
from bento.utils.utils \
    import \
        cmd_is_runnable

import waflib

sys.path.insert(0, os.getcwd())
try:
    _SETUP_PY = __import__("setup")
finally:
    sys.path.pop(0)

def check_blas_lapack(conf):
    conf.env.HAS_CBLAS = False
    if sys.platform == "win32":
        mkl_libs = "mkl_lapack95,mkl_blas95,mkl_intel_c,mkl_intel_thread,mkl_core,libiomp5md".split(",")
        mkl_base = r"C:\Program Files\Intel\Compiler\11.1\051"
        conf.env.INCLUDES.append("%s\mkl\include" % mkl_base)
        conf.env.LIBPATH.extend(["%s\mkl\ia32\lib" % mkl_base,
                                 "%s\lib\ia32" % mkl_base])

        try:
            conf.check_cc(lib=mkl_libs, msg="Checking for MKL (CBLAS)",
                          uselib_store="CBLAS")
            conf.env.HAS_CBLAS = True
        except waflib.Errors.ConfigurationError:
            conf.env.HAS_LAPACK = False

        try:
            conf.check_cc(lib=mkl_libs, msg="Checking for MKL (LAPACK)",
                          uselib_store="LAPACK")
            conf.env.HAS_LAPACK = True
        except waflib.Errors.ConfigurationError:
            conf.env.HAS_LAPACK = False


    elif sys.platform == "darwin":
        try:
            conf.check(framework="Accelerate", msg="Checking for framework Accelerate (CBLAS)", uselib_store="CBLAS")
            conf.env.HAS_CBLAS = True
        except waflib.Errors.ConfigurationError:
            conf.env.HAS_CBLAS = False

        try:
            conf.check(framework="Accelerate", msg="Checking for framework Accelerate (LAPACK)", uselib_store="LAPACK")
            conf.env.HAS_LAPACK = True
        except waflib.Errors.ConfigurationError:
            conf.env.HAS_LAPACK = False
    else:
        try:
            conf.check_cc(lib=["cblas", "atlas"], uselib_store="CBLAS")
            conf.env.HAS_CBLAS = True
        except waflib.Errors.ConfigurationError:
            conf.env.HAS_CBLAS = False

        try:
            conf.check_cc(lib=["lapack", "f77blas", "cblas", "atlas"],
                          uselib_store="LAPACK")
            conf.env.HAS_LAPACK = True
        except waflib.Errors.ConfigurationError:
            conf.env.HAS_LAPACK = False

    # You can manually set up blas/lapack as follows:
    #conf.env.HAS_CBLAS = True
    #conf.env.LIB_CBLAS = ["cblas", "atlas"]
    #conf.env.HAS_LAPACK = True
    #conf.env.LIB_LAPACK = ["lapack", "f77blas", "cblas", "atlas"]

def compute_git_revision(top_node):
    git_repo_node = top_node.find_node(".git")
    if git_repo_node and cmd_is_runnable(["git", "--version"]):
        s = subprocess.Popen(["git", "rev-parse", "HEAD"],
                stdout=subprocess.PIPE, stderr=subprocess.STDOUT, cwd=top_node.abspath())
        out = s.communicate()[0]
        return out.decode().strip()
    else:
        return ""

def _register_metadata(context):
    git_revision = compute_git_revision(context.top_node)
    full_version = context.pkg.version
    if not _SETUP_PY.ISRELEASED:
        full_version += '.dev-' + git_revision[:7]

    context.register_metadata("git_revision", git_revision)
    context.register_metadata("is_released", _SETUP_PY.ISRELEASED)
    context.register_metadata("full_version", full_version)

@hooks.post_configure
def post_configure(context):
    conf = context.waf_context
    if conf.env["CC_NAME"] == "gcc":
        conf.env.CFLAGS_PYEXT.append("-Wfatal-errors")
    check_blas_lapack(conf)

@hooks.pre_build
def pre_build(context):
    _register_metadata(context)

@hooks.pre_sdist
def pre_sdist(context):
    _register_metadata(context)