#!/usr/bin/env python
import datetime
import glob
import os
import shutil
import subprocess
import sys

from waflib.extras import autowaf as autowaf
import waflib.Context as Context
import waflib.Logs as Logs
import waflib.Options as Options
import waflib.Scripting as Scripting

# Variables for 'waf dist'
APPNAME = 'lv2'
VERSION = '1.0.7'

# Mandatory variables
top = '.'
out = 'build'

def options(opt):
    opt.load('compiler_cc')
    opt.load('compiler_cxx')
    autowaf.set_options(opt)
    opt.add_option('--test', action='store_true', dest='build_tests',
                   help='Build unit tests')
    opt.add_option('--no-plugins', action='store_true', dest='no_plugins',
                   help='Do not build example plugins')
    opt.add_option('--copy-headers', action='store_true', dest='copy_headers',
                   help='Copy headers instead of linking to bundle')
    opt.recurse('lv2/lv2plug.in/ns/lv2core')

def configure(conf):
    try:
        conf.load('compiler_c')
        conf.load('compiler_cxx')
    except:
        Options.options.build_tests = False
        Options.options.no_plugins = True

    autowaf.configure(conf)
    autowaf.set_c99_mode(conf)

    if Options.platform == 'win32' or not hasattr(os.path, 'relpath'):
        Logs.warn('System does not support linking headers, copying')
        Options.options.copy_headers = True

    conf.env.BUILD_TESTS   = Options.options.build_tests
    conf.env.BUILD_PLUGINS = not Options.options.no_plugins
    conf.env.COPY_HEADERS  = Options.options.copy_headers

    # Check for gcov library (for test coverage)
    if conf.env.BUILD_TESTS and not conf.is_defined('HAVE_GCOV'):
        conf.check_cc(lib='gcov', define_name='HAVE_GCOV', mandatory=False)

    autowaf.set_recursive()

    conf.recurse('lv2/lv2plug.in/ns/lv2core')

    conf.env.LV2_BUILD = ['lv2/lv2plug.in/ns/lv2core']
    if conf.env.BUILD_PLUGINS:
        for i in conf.path.ant_glob('plugins/*', dir=True):
            try:
                conf.recurse(i.srcpath())
                conf.env.LV2_BUILD += [i.srcpath()]
            except:
                Logs.warn('Configuration failed, %s will not be built\n' % i)

    autowaf.configure(conf)
    autowaf.display_header('LV2 Configuration')
    autowaf.display_msg(conf, 'Bundle directory', conf.env.LV2DIR)
    autowaf.display_msg(conf, 'Copy (not link) headers', conf.env.COPY_HEADERS)
    autowaf.display_msg(conf, 'Version', VERSION)

def chop_lv2_prefix(s):
    if s.startswith('lv2/lv2plug.in/'):
        return s[len('lv2/lv2plug.in/'):]
    return s

# Rule for calling lv2specgen on a spec bundle
def specgen(task):
    import rdflib
    doap = rdflib.Namespace('http://usefulinc.com/ns/doap#')
    lv2  = rdflib.Namespace('http://lv2plug.in/ns/lv2core#')
    owl  = rdflib.Namespace('http://www.w3.org/2002/07/owl#')
    rdf  = rdflib.Namespace('http://www.w3.org/1999/02/22-rdf-syntax-ns#')

    sys.path.append('./lv2specgen')
    import lv2specgen

    spec   = task.inputs[0]
    path   = os.path.dirname(spec.srcpath())
    outdir = os.path.abspath(os.path.join(out, chop_lv2_prefix(path)))

    bundle = str(outdir)
    b = os.path.basename(outdir)

    if not os.access(spec.abspath(), os.R_OK):
        print('warning: extension %s has no %s.ttl file' % (b, b))
        return

    try:
        model = rdflib.ConjunctiveGraph()
        for i in glob.glob('%s/*.ttl' % bundle):
            model.parse(i, format='n3')
    except:
        e = sys.exc_info()[1]
        print('error parsing %s: %s' % (bundle, str(e)))
        return

    # Get extension URI
    ext_node = model.value(None, rdf.type, lv2.Specification)
    if not ext_node:
        print('no extension found in %s' % bundle)
        return
    
    ext = str(ext_node)

    # Get version
    minor = 0
    micro = 0
    try:
        minor = int(model.value(ext_node, lv2.minorVersion, None))
        micro = int(model.value(ext_node, lv2.microVersion, None))
    except:
        e = sys.exc_info()[1]
        print('warning: %s: failed to find version for %s' % (bundle, ext))

    # Get date
    date = None
    for r in model.triples([ext_node, doap.release, None]):
        revision = model.value(r[2], doap.revision, None)
        if revision == ('%d.%d' % (minor, micro)):
            date = model.value(r[2], doap.created, None)
            break

    # Verify that this date is the latest
    for r in model.triples([ext_node, doap.release, None]):
        revision = model.value(r[2], doap.revision, None)
        this_date = model.value(r[2], doap.created, None)
        if this_date > date:
            print('warning: %s revision %d.%d (%s) is not the latest release' % (
                ext_node, minor, micro, date))
            break
    
    # Get short description
    shortdesc = model.value(ext_node, doap.shortdesc, None)

    SPECGENDIR = 'lv2specgen'
    STYLEPATH  = 'build/aux/style.css'
    TAGFILE    = 'build/tags'

    specdoc = lv2specgen.specgen(
        spec.abspath(),
        SPECGENDIR,
        os.path.relpath(STYLEPATH, bundle),
        os.path.relpath('build/doc/html', bundle),
        TAGFILE,
        instances=True)

    lv2specgen.save(task.outputs[0].abspath(), specdoc)

    # Name (comment is to act as a sort key)
    row = '<tr><!-- %s --><td><a rel="rdfs:seeAlso" href="%s">%s</a></td>' % (
        b, path[len('lv2/lv2plug.in/ns/'):], b)

    # Description
    if shortdesc:
        row += '<td>' + str(shortdesc) + '</td>'
    else:
        row += '<td></td>'

    # Version
    version_str = '%s.%s' % (minor, micro)
    if minor == 0 or (micro % 2 != 0):
        row += '<td><span style="color: red">' + version_str + '</span></td>'
    else:
        row += '<td>' + version_str + '</td>'

    # Status
    deprecated = model.value(ext_node, owl.deprecated, None)
    if minor == 0:
        row += '<td><span class="error">Experimental</span></td>'
    elif deprecated and str(deprecated[2]) != "false":
        row += '<td><span class="warning">Deprecated</span></td>'
    elif micro % 2 == 0:
        row += '<td><span class="success">Stable</span></td>'

    row += '</tr>'

    index = open(os.path.join('build', 'index_rows', b), 'w')
    index.write(row)
    index.close()

def subst_file(template, output, dict):
    i = open(template, 'r')
    o = open(output, 'w')
    for line in i:
        for key in dict:
            line = line.replace(key, dict[key])
        o.write(line)
    i.close()
    o.close()

# Task to build extension index
def build_index(task):
    global index_lines
    rows = []
    for f in task.inputs:
        if not f.abspath().endswith('index.html.in'):
            rowfile = open(f.abspath(), 'r')
            rows += rowfile.readlines()
            rowfile.close()

    subst_file(task.inputs[0].abspath(), task.outputs[0].abspath(),
               { '@ROWS@': ''.join(rows),
                 '@TIME@': datetime.datetime.utcnow().strftime('%F %H:%M UTC') })

# Task for making a link in the build directory to a source file
def link(task):
    if hasattr(os, 'symlink'):
        func = os.symlink
    else:
        func = shutil.copy  # Symlinks unavailable, make a copy

    try:
        os.remove(task.outputs[0].abspath())  # Remove old target
    except:
        pass  # No old target, whatever

    func(task.inputs[0].abspath(), task.outputs[0].abspath())

def build_ext(bld, path):
    name        = os.path.basename(path)
    bundle_dir  = os.path.join(bld.env.LV2DIR, name + '.lv2')
    include_dir = os.path.join(bld.env.INCLUDEDIR, path)

    # Copy headers to URI-style include paths in build directory
    for i in bld.path.ant_glob(path + '/*.h'):
        bld(rule   = link,
            source = i,
            target = bld.path.get_bld().make_node('%s/%s' % (path, i)))

    # Build test program if applicable
    if bld.env.BUILD_TESTS and bld.path.find_node(path + '/%s-test.c' % name):
        test_lib    = []
        test_cflags = ['']
        if bld.is_defined('HAVE_GCOV'):
            test_lib    += ['gcov']
            test_cflags += ['-fprofile-arcs', '-ftest-coverage']

        # Unit test program
        bld(features     = 'c cprogram',
            source       = path + '/%s-test.c' % name,
            lib          = test_lib,
            target       = path + '/%s-test' % name,
            install_path = None,
            cflags       = test_cflags)

    # Install bundle
    bld.install_files(bundle_dir,
                      bld.path.ant_glob(path + '/?*.*', excl='*.in'))

    # Install URI-like includes
    headers = bld.path.ant_glob(path + '/*.h')
    if headers:
        if bld.env.COPY_HEADERS:
            bld.install_files(include_dir, headers)
        else:
            bld.symlink_as(include_dir,
                           os.path.relpath(bundle_dir,
                                           os.path.dirname(include_dir)))

def build(bld):
    exts = (bld.path.ant_glob('lv2/lv2plug.in/ns/ext/*', dir=True) +
            bld.path.ant_glob('lv2/lv2plug.in/ns/extensions/*', dir=True))

    # Copy lv2.h to URI-style include path in build directory
    lv2_h_path = 'lv2/lv2plug.in/ns/lv2core/lv2.h'
    bld(rule   = link,
        source = bld.path.find_node(lv2_h_path),
        target = bld.path.get_bld().make_node(lv2_h_path))

    # LV2 pkgconfig file
    bld(features     = 'subst',
        source       = 'lv2.pc.in',
        target       = 'lv2.pc',
        install_path = '${LIBDIR}/pkgconfig',
        PREFIX       = bld.env.PREFIX,
        INCLUDEDIR   = bld.env.INCLUDEDIR,
        VERSION      = VERSION)

    # Build extensions
    for i in exts:
        build_ext(bld, i.srcpath())

    # Build plugins
    for i in bld.env.LV2_BUILD:
        bld.recurse(i)

    if bld.env.DOCS:
        # Build Doxygen documentation (and tags file)
        autowaf.build_dox(bld, 'LV2', VERSION, top, out)

        # Copy stylesheet to build directory
        bld(features = 'subst',
            is_copy  = True,
            name     = 'copy',
            source   = 'doc/style.css',
            target   = 'aux/style.css')

        index_files = []

        # Prepare spec output directories
        specs = exts + [bld.path.find_node('lv2/lv2plug.in/ns/lv2core')]
        for i in specs:
            # Copy spec files to build dir
            for f in bld.path.ant_glob(i.srcpath() + '/*.*'):
                bld(features = 'subst',
                    is_copy  = True,
                    name     = 'copy',
                    source   = f,
                    target   = chop_lv2_prefix(f.srcpath()))

            base = i.srcpath()[len('lv2/lv2plug.in'):]
            name = os.path.basename(i.srcpath())
            
            # Generate .htaccess file
            bld(features     = 'subst',
                source       = 'doc/htaccess.in',
                target       = os.path.join(base, '.htaccess'),
                install_path = None,
                NAME         = name,
                BASE         = base)

        # Call lv2specgen for each spec
        for i in specs:
            name = os.path.basename(i.srcpath())
            index_file = os.path.join('index_rows', name)
            index_files += [index_file]

            bld.add_group()  # Barrier (don't call lv2specgen in parallel)

            # Call lv2specgen to generate spec docs
            bld(rule   = specgen,
                name   = 'specgen',
                source = os.path.join(i.srcpath(), name + '.ttl'),
                target = ['%s/%s.html' % (chop_lv2_prefix(i.srcpath()), name),
                          index_file])

        index_files.sort()
        bld.add_group()  # Barrier (wait for lv2specgen to build index)

        # Build extension index
        bld(rule   = build_index,
            name   = 'index',
            source = ['lv2/lv2plug.in/ns/index.html.in'] + index_files,
            target = 'ns/index.html')

    if bld.env.BUILD_TESTS:
        # Generate a compile test .c file that includes all headers
        def gen_build_test(task):
            out = open(task.outputs[0].abspath(), 'w')
            for i in task.inputs:
                out.write('#include "%s"\n' % i.bldpath())
            out.write('int main(void) { return 0; }\n')
            out.close()

        bld(rule         = gen_build_test,
            source       = bld.path.ant_glob('lv2/**/*.h'),
            target       = 'build-test.c',
            install_path = None)

        bld(features     = 'c cprogram',
            source       = bld.path.get_bld().make_node('build-test.c'),
            target       = 'build-test',
            install_path = None)

def lint(ctx):
    for i in ctx.path.ant_glob('lv2/**/*.h'):
        subprocess.call('cpplint.py --filter=+whitespace/comments,-whitespace/tab,-whitespace/braces,-whitespace/labels,-build/header_guard,-readability/casting,-build/include,-runtime/sizeof ' + i.abspath(), shell=True)

def test(ctx):
    autowaf.pre_test(ctx, APPNAME, dirs=['.'])
    for i in ctx.path.ant_glob('**/*-test'):
        name = os.path.basename(i.abspath())
        os.environ['PATH'] = '.' + os.pathsep + os.getenv('PATH')
        autowaf.run_tests(
            ctx, name, [i.path_from(ctx.path.find_node('build'))], dirs=['.'])
    autowaf.post_test(ctx, APPNAME, dirs=['.'])

class Dist(Scripting.Dist):
    def execute(self):
        'Execute but do not call archive() since dist() has already done so.'
        self.recurse([os.path.dirname(Context.g_module.root_path)])

    def get_tar_path(self, node):
        'Resolve symbolic links to avoid broken links in tarball.'
        return os.path.realpath(node.abspath())

class DistCheck(Dist, Scripting.DistCheck):
    def execute(self):
        Dist.execute(self)
        self.check()
    
    def archive(self):
        Dist.archive(self)

def dist(ctx):
    subdirs = ([ctx.path.find_node('lv2/lv2plug.in/ns/lv2core')] +
               ctx.path.ant_glob('plugins/*', dir=True) +
               ctx.path.ant_glob('lv2/lv2plug.in/ns/ext/*', dir=True) +
               ctx.path.ant_glob('lv2/lv2plug.in/ns/extension/*', dir=True))

    # Write NEWS files in source directory
    for i in subdirs:
        print '* ' + i.path_from(ctx.path)
        print ctx.path.ant_glob(i.path_from(ctx.path) + '/*.ttl')
        def abspath(node):
            return node.abspath()
        in_files = map(abspath,
                       ctx.path.ant_glob(i.path_from(ctx.path) + '/*.ttl'))
        autowaf.write_news(os.path.basename(i.abspath()),
                           in_files,
                           i.abspath() + '/NEWS')

    # Build archive
    ctx.archive()

    # Delete generated NEWS files from source directory
    for i in subdirs:
        try:
            os.remove(os.path.join(i.abspath(), 'NEWS'))
        except:
            pass