#!/usr/bin/env python

from __future__ import print_function

import argparse
import errno
import functools
import html
import io
from multiprocessing import cpu_count
import os.path
import re
import shutil
import sys

from pygments import highlight
from pygments.lexers.c_cpp import CppLexer
from pygments.formatters import HtmlFormatter

import optpmap
import optrecord


desc = '''Generate HTML output to visualize optimization records from the YAML files
generated with -fsave-optimization-record and -fdiagnostics-show-hotness.

The tools requires PyYAML and Pygments Python packages.'''


# This allows passing the global context to the child processes.
class Context:
    def __init__(self, caller_loc = dict()):
       # Map function names to their source location for function where inlining happened
       self.caller_loc = caller_loc

context = Context()

def suppress(remark):
    if remark.Name == 'sil.Specialized':
        return remark.getArgDict()['Function'][0].startswith('\"Swift.')
    elif remark.Name == 'sil.Inlined':
        return remark.getArgDict()['Callee'][0].startswith(('\"Swift.', '\"specialized Swift.'))
    return False

class SourceFileRenderer:
    def __init__(self, source_dir, output_dir, filename, no_highlight):
        self.filename = filename
        existing_filename = None
        if os.path.exists(filename):
            existing_filename = filename
        else:
            fn = os.path.join(source_dir, filename)
            if os.path.exists(fn):
                existing_filename = fn

        self.no_highlight = no_highlight
        self.stream = io.open(os.path.join(output_dir, optrecord.html_file_name(filename)), 'w', encoding='utf-8')
        if existing_filename:
            self.source_stream = io.open(existing_filename, encoding='utf-8')
        else:
            self.source_stream = None
            print(u'''
<html>
<h1>Unable to locate file {}</h1>
</html>
            '''.format(filename), file=self.stream)

        self.html_formatter = HtmlFormatter(encoding='utf-8')
        self.cpp_lexer = CppLexer(stripnl=False)

    def render_source_lines(self, stream, line_remarks):
        file_text = stream.read()

        if self.no_highlight:
            html_highlighted = file_text
        else:
            html_highlighted = highlight(
            file_text,
                self.cpp_lexer,
                self.html_formatter)

            # Note that the API is different between Python 2 and 3.  On
            # Python 3, pygments.highlight() returns a bytes object, so we
            # have to decode.  On Python 2, the output is str but since we
            # support unicode characters and the output streams is unicode we
            # decode too.
            html_highlighted = html_highlighted.decode('utf-8')

            # Take off the header and footer, these must be
            #   reapplied line-wise, within the page structure
            html_highlighted = html_highlighted.replace('<div class="highlight"><pre>', '')
            html_highlighted = html_highlighted.replace('</pre></div>', '')

        for (linenum, html_line) in enumerate(html_highlighted.split('\n'), start=1):
            print(u'''
<tr>
<td><a name=\"L{linenum}\">{linenum}</a></td>
<td></td>
<td></td>
<td><div class="highlight"><pre>{html_line}</pre></div></td>
</tr>'''.format(**locals()), file=self.stream)

            for remark in line_remarks.get(linenum, []):
                if not suppress(remark):
                    self.render_inline_remarks(remark, html_line)

    def render_inline_remarks(self, r, line):
        inlining_context = r.DemangledFunctionName
        dl = context.caller_loc.get(r.Function)
        if dl:
            dl_dict = dict(list(dl))
            link = optrecord.make_link(dl_dict['File'], dl_dict['Line'] - 2)
            inlining_context = "<a href={link}>{r.DemangledFunctionName}</a>".format(**locals())

        # Column is the number of characters *including* tabs, keep those and
        # replace everything else with spaces.
        indent = line[:max(r.Column, 1) - 1]
        indent = re.sub('\S', ' ', indent)

        # Create expanded message and link if we have a multiline message.
        lines = r.message.split('\n')
        if len(lines) > 1:
            expand_link = '<a style="text-decoration: none;" href="" onclick="toggleExpandedMessage(this); return false;">+</a>'
            message = lines[0]
            expand_message = u'''
<div class="full-info" style="display:none;">
  <div class="col-left"><pre style="display:inline">{}</pre></div>
  <div class="expanded col-left"><pre>{}</pre></div>
</div>'''.format(indent, '\n'.join(lines[1:]))
        else:
            expand_link = ''
            expand_message = ''
            message = r.message
        print(u'''
<tr>
<td></td>
<td>{r.RelativeHotness}</td>
<td class=\"column-entry-{r.color}\">{r.PassWithDiffPrefix}</td>
<td><pre style="display:inline">{indent}</pre><span class=\"column-entry-yellow\">{expand_link} {message}&nbsp;</span>{expand_message}</td>
<td class=\"column-entry-yellow\">{inlining_context}</td>
</tr>'''.format(**locals()), file=self.stream)

    def render(self, line_remarks):
        if not self.source_stream:
            return

        print(u'''
<html>
<title>{}</title>
<meta charset="utf-8" />
<head>
<link rel='stylesheet' type='text/css' href='style.css'>
<script type="text/javascript">
/* Simple helper to show/hide the expanded message of a remark. */
function toggleExpandedMessage(e) {{
  var FullTextElems = e.parentElement.parentElement.getElementsByClassName("full-info");
  if (!FullTextElems || FullTextElems.length < 1) {{
      return false;
  }}
  var FullText = FullTextElems[0];
  if (FullText.style.display == 'none') {{
    e.innerHTML = '-';
    FullText.style.display = 'block';
  }} else {{
    e.innerHTML = '+';
    FullText.style.display = 'none';
  }}
}}
</script>
</head>
<body>
<div class="centered">
<table class="source">
<thead>
<tr>
<th style="width: 2%">Line</td>
<th style="width: 3%">Hotness</td>
<th style="width: 10%">Optimization</td>
<th style="width: 70%">Source</td>
<th style="width: 15%">Inline Context</td>
</tr>
</thead>
<tbody>'''.format(os.path.basename(self.filename)), file=self.stream)
        self.render_source_lines(self.source_stream, line_remarks)

        print(u'''
</tbody>
</table>
</body>
</html>''', file=self.stream)


class IndexRenderer:
    def __init__(self, output_dir, should_display_hotness, max_hottest_remarks_on_index):
        self.stream = io.open(os.path.join(output_dir, 'index.html'), 'w', encoding='utf-8')
        self.should_display_hotness = should_display_hotness
        self.max_hottest_remarks_on_index = max_hottest_remarks_on_index

    def render_entry(self, r, odd):
        escaped_name = html.escape(r.DemangledFunctionName)
        print(u'''
<tr>
<td class=\"column-entry-{odd}\"><a href={r.Link}>{r.DebugLocString}</a></td>
<td class=\"column-entry-{odd}\">{r.RelativeHotness}</td>
<td class=\"column-entry-{odd}\">{escaped_name}</td>
<td class=\"column-entry-{r.color}\">{r.PassWithDiffPrefix}</td>
</tr>'''.format(**locals()), file=self.stream)

    def render(self, all_remarks):
        print(u'''
<html>
<meta charset="utf-8" />
<head>
<link rel='stylesheet' type='text/css' href='style.css'>
</head>
<body>
<div class="centered">
<table>
<tr>
<td>Source Location</td>
<td>Hotness</td>
<td>Function</td>
<td>Pass</td>
</tr>''', file=self.stream)

        max_entries = None
        if self.should_display_hotness:
            max_entries = self.max_hottest_remarks_on_index

        for i, remark in enumerate(all_remarks[:max_entries]):
            if not suppress(remark):
                self.render_entry(remark, i % 2)
        print(u'''
</table>
</body>
</html>''', file=self.stream)


def _render_file(source_dir, output_dir, ctx, no_highlight, entry, filter_):
    global context
    context = ctx
    filename, remarks = entry
    SourceFileRenderer(source_dir, output_dir, filename, no_highlight).render(remarks)


def map_remarks(all_remarks):
    # Set up a map between function names and their source location for
    # function where inlining happened
    for remark in optrecord.itervalues(all_remarks):
        if isinstance(remark, optrecord.Passed) and remark.Pass == "inline" and remark.Name == "Inlined":
            for arg in remark.Args:
                arg_dict = dict(list(arg))
                caller = arg_dict.get('Caller')
                if caller:
                    try:
                        context.caller_loc[caller] = arg_dict['DebugLoc']
                    except KeyError:
                        pass


def generate_report(all_remarks,
                    file_remarks,
                    source_dir,
                    output_dir,
                    no_highlight,
                    should_display_hotness,
                    max_hottest_remarks_on_index,
                    num_jobs,
                    should_print_progress):
    try:
        os.makedirs(output_dir)
    except OSError as e:
        if e.errno == errno.EEXIST and os.path.isdir(output_dir):
            pass
        else:
            raise

    if should_print_progress:
        print('Rendering index page...')
    if should_display_hotness:
        sorted_remarks = sorted(optrecord.itervalues(all_remarks), key=lambda r: (r.Hotness, r.File, r.Line, r.Column, r.PassWithDiffPrefix, r.yaml_tag, r.Function), reverse=True)
    else:
        sorted_remarks = sorted(optrecord.itervalues(all_remarks), key=lambda r: (r.File, r.Line, r.Column, r.PassWithDiffPrefix, r.yaml_tag, r.Function))
    IndexRenderer(output_dir, should_display_hotness, max_hottest_remarks_on_index).render(sorted_remarks)

    shutil.copy(os.path.join(os.path.dirname(os.path.realpath(__file__)),
            "style.css"), output_dir)

    _render_file_bound = functools.partial(_render_file, source_dir, output_dir, context, no_highlight)
    if should_print_progress:
        print('Rendering HTML files...')
    optpmap.pmap(_render_file_bound,
                 file_remarks.items(),
                 num_jobs,
                 should_print_progress)


def main():
    parser = argparse.ArgumentParser(description=desc)
    parser.add_argument(
        'yaml_dirs_or_files',
        nargs='+',
        help='List of optimization record files or directories searched '
             'for optimization record files.')
    parser.add_argument(
        '--output-dir',
        '-o',
        default='html',
        help='Path to a directory where generated HTML files will be output. '
             'If the directory does not already exist, it will be created. '
             '"%(default)s" by default.')
    parser.add_argument(
        '--jobs',
        '-j',
        default=None,
        type=int,
        help='Max job count (defaults to %(default)s, the current CPU count)')
    parser.add_argument(
        '--source-dir',
        '-s',
        default='',
        help='set source directory')
    parser.add_argument(
        '--no-progress-indicator',
        '-n',
        action='store_true',
        default=False,
        help='Do not display any indicator of how many YAML files were read '
             'or rendered into HTML.')
    parser.add_argument(
        '--max-hottest-remarks-on-index',
        default=1000,
        type=int,
        help='Maximum number of the hottest remarks to appear on the index page')
    parser.add_argument(
        '--no-highlight',
        action='store_true',
        default=False,
        help='Do not use a syntax highlighter when rendering the source code')
    parser.add_argument(
        '--demangler',
        help='Set the demangler to be used (defaults to %s)' % optrecord.Remark.default_demangler)

    parser.add_argument(
        '--filter',
        default='',
        help='Only display remarks from passes matching filter expression')

    # Do not make this a global variable.  Values needed to be propagated through
    # to individual classes and functions to be portable with multiprocessing across
    # Windows and non-Windows.
    args = parser.parse_args()

    print_progress = not args.no_progress_indicator
    if args.demangler:
        optrecord.Remark.set_demangler(args.demangler)

    files = optrecord.find_opt_files(*args.yaml_dirs_or_files)
    if not files:
        parser.error("No *.opt.yaml files found")
        sys.exit(1)

    all_remarks, file_remarks, should_display_hotness = \
        optrecord.gather_results(files, args.jobs, print_progress, args.filter)

    map_remarks(all_remarks)

    generate_report(all_remarks,
                    file_remarks,
                    args.source_dir,
                    args.output_dir,
                    args.no_highlight,
                    should_display_hotness,
                    args.max_hottest_remarks_on_index,
                    args.jobs,
                    print_progress)

if __name__ == '__main__':
    main()