# vim: set ts=8 sts=2 sw=2 tw=99 et:

#

# This file is part of AMBuild.

# 

# AMBuild is free software: you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation, either version 3 of the License, or

# (at your option) any later version.

# 

# AMBuild is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

# GNU General Public License for more details.

# 

# You should have received a copy of the GNU General Public License

# along with AMBuild. If not, see <http://www.gnu.org/licenses/>.

import os

from ambuild2 import util

from ambuild2 import nodetypes

from ambuild2.frontend.cpp import DetectCompiler

from ambuild2.frontend import base_gen

from ambuild2 import database

class CppNodes(object):

  def __init__(self, output, debug_outputs):

    self.binary = output

    self.debug = debug_outputs

class Generator(base_gen.Generator):

  def __init__(self, sourcePath, buildPath, originalCwd, options, args, db=None, refactoring=False):

    super(Generator, self).__init__(sourcePath, buildPath, originalCwd, options, args)

    self.cacheFolder = os.path.join(self.buildPath, '.ambuild2')

    self.old_scripts_ = set()

    self.old_folders_ = set()

    self.old_commands_ = set()

    self.old_groups_ = set()

    self.rm_list_ = []

    self.bad_outputs_ = set()

    self.db = db

    self.is_bootstrap = not self.db

    self.refactoring = refactoring

  @classmethod

  def FromVars(cls, vars, db, refactoring):

    # Backwards compatibility: for an automatic reconfigure on an older build,

    # just assume the source path is the cwd. If the AMBuildScript suddenly

    # has decided to depend on originalCwd, then the user may have to manually

    # run configure.py again, until we remove configure.py entirely.

    if 'originalCwd' in vars:

      originalCwd = vars['originalCwd']

    else:

      originalCwd = vars['sourcePath']

    gen = cls(

      sourcePath = vars['sourcePath'],

      buildPath = vars['buildPath'],

      originalCwd = originalCwd,

      options = vars['options'],

      args = vars['args'],

      db = db,

      refactoring = refactoring

    )

    return gen

  def preGenerate(self):

    if not os.path.isdir(self.cacheFolder):

      os.mkdir(self.cacheFolder)

    if not self.db:

      db_path = os.path.join(self.cacheFolder, 'graph')

      if not os.path.isfile(db_path):

        self.db = database.CreateDatabase(db_path)

      else:

        self.db = database.Database(db_path)

        self.db.connect()

    self.db.query_scripts(lambda id,path,stamp: self.old_scripts_.add(path))

    self.db.query_mkdir(lambda entry: self.old_folders_.add(entry))

    self.db.query_commands(lambda entry: self.old_commands_.add(entry))

    self.db.query_groups(lambda entry:self.old_groups_.add(entry))

  def cleanup(self):

    for path in self.rm_list_:

      util.rm_path(path)

    for cmd_entry in self.old_commands_:

      if self.refactoring:

        util.con_err(util.ConsoleRed, 'Command removed during refactoring: \n',

                     util.ConsoleBlue, cmd_entry.format(),

                     util.ConsoleNormal)

        raise Exception('Refactoring error: command removed')

      self.db.drop_command(cmd_entry)

    for path in self.old_scripts_:

      self.db.drop_script(path)

    for group in self.old_groups_:

      self.db.drop_group(group)

    self.db.query_dead_sources(lambda e: self.db.drop_source(e))

    self.db.query_dead_shared_outputs(lambda e: self.db.drop_output(e))

    class Node:

      def __init__(self):

        self.incoming = set()

        self.outgoing = set()

    # Build a tree of dead folders.

    tracker = {}

    for entry in self.old_folders_:

      if entry not in tracker:

        tracker[entry] = Node()

      if entry.folder is None:

        continue

      # If our parent is not a dead folder, don't create an edge. It should be

      # impossible for a/b to be dead, a/b/c to be alive, and a/b/c/d to be

      # dead, since a/b/c will implicitly keep a/b alive.

      if entry.folder not in self.old_folders_:

        continue

      if entry.folder not in tracker:

        tracker[entry.folder] = Node()

      parent = tracker[entry.folder]

      child = tracker[entry]

      parent.incoming.add(entry)

      child.outgoing.add(entry.folder)

    # Find the leaves. Sets start out >= 1 items. Remove them as they they

    # are empty.

    dead_folders = [entry for entry in self.old_folders_ if len(tracker[entry].incoming) == 0]

    while len(dead_folders):

      child_entry = dead_folders.pop()

      child_node = tracker[child_entry]

      if self.refactoring:

        util.con_err(util.ConsoleRed, 'Folder removed during refactoring: \n',

                     util.ConsoleBlue, child_entry.format(),

                     util.ConsoleNormal)

        raise Exception('Refactoring error: command removed')

      self.db.drop_folder(child_entry)

      for parent_entry in child_node.outgoing:

        parent_node = tracker[parent_entry]

        parent_node.incoming.remove(child_entry)

        if not len(parent_node.incoming):

          dead_folders.append(parent_entry)

  def postGenerate(self):

    self.cleanup()

    self.db.commit()

    self.db.vacuum()

    if self.is_bootstrap:

      self.saveVars()

      self.db.close()

  def saveVars(self):

    vars = {

      'sourcePath': self.sourcePath,

      'buildPath': self.buildPath,

      'originalCwd': self.originalCwd,

      'options': self.options,

      'args': self.args

    }

    with open(os.path.join(self.cacheFolder, 'vars'), 'wb') as fp:

      util.DiskPickle(vars, fp)

  def getLocalFolder(self, context):

    if type(context.localFolder_) is nodetypes.Entry or context.localFolder_ is None:

      return context.localFolder_

    if len(context.buildFolder):

      context.localFolder_ = self.generateFolder(None, context.buildFolder)

    else:

      context.localFolder_ = None

    return context.localFolder_

  def generateFolder(self, parent, folder):

    parent_path = ''

    if parent:

      parent_path = parent.path

    path = os.path.normpath(os.path.join(parent_path, folder))

    if path.startswith('..'):

      util.con_err(

        util.ConsoleRed,

        'Output path ',

        util.ConsoleBlue,

        path,

        util.ConsoleRed,

        ' is outside the build folder!',

        util.ConsoleNormal

      )

      raise Exception('Cannot generate folders outside the build folder')

    # Quick check. If this folder is not in our old folder list, and it's in

    # the DB, then we already have an entry for it that has already negotiated

    # its parent paths.

    old_entry = self.db.query_path(path)

    if old_entry and self.isValidFolderEntry(old_entry):

      return old_entry

    components = []

    while folder:

      folder, name = os.path.split(folder)

      if not name:

        break

      components.append(name)

    path = parent_path

    while len(components):

      name = components.pop()

      path = os.path.join(path, name)

      entry = self.db.query_path(path)

      if not entry:

        if self.refactoring:

          util.con_err(util.ConsoleRed, 'New folder introduced: ',

                       util.ConsoleBlue, path,

                       util.ConsoleNormal)

          raise Exception('Refactoring error: new folder')

        entry = self.db.add_folder(parent, path)

      elif entry.type == nodetypes.Output or entry.type == nodetypes.SharedOutput:

        if entry.type == nodetypes.Output:

          cmd_entries = [self.db.query_command_of(entry)]

        elif entry.type == nodetypes.SharedOutput:

          cmd_entries = self.db.query_shared_commands_of(entry)

        for cmd_entry in cmd_entries:

          if cmd_entry not in self.old_commands_:

            util.con_err(util.ConsoleRed, 'Folder has the same path as an output file generated by:\n',

                         util.ConsoleBlue, cmd_entry.format(),

                         util.ConsoleNormal)

            raise Exception('Output has been duplicated: {0}'.format(entry.path))

        if self.refactoring:

          util.con_err(util.ConsoleRed, 'Path "',

                       util.ConsoleBlue, entry.path,

                       util.ConsoleRed, '" has changed from a file to a folder.',

                       util.ConsoleNormal)

          raise Exception('Refactoring error: path changed from file to folder')

        self.rm_list_.append(entry.path)

        self.db.change_to_folder(entry)

      elif entry.type == nodetypes.Mkdir:

        # We let the same folder be generated twice, so use discard, not remove.

        self.old_folders_.discard(entry)

      else:

        util.con_err(util.ConsoleRed, 'Folder has the same node signature as: ',

                     util.ConsoleBlue, entry.format(),

                     util.ConsoleNormal)

        raise Exception('Output has been duplicated: {0}'.format(entry.path))

      parent = entry

    return entry

  def isValidFolderEntry(self, folder_entry):

    # If it's a mkdir and it's created, we're done.

    return folder_entry.type == nodetypes.Mkdir and folder_entry not in self.old_folders_

  def validateOutputFolder(self, path):

    # Empty path is the root folder, which is null.

    if not len(path):

      return None

    # The folder must already exist.

    folder_entry = self.db.query_path(path)

    if not folder_entry:

      util.con_err(util.ConsoleRed, 'Path "',

                   util.ConsoleBlue, path,

                   util.ConsoleRed, '" specifies a folder that does not exist.',

                   util.ConsoleNormal)

      raise Exception('path specifies a folder that does not exist')

    if self.isValidFolderEntry(folder_entry):

      return folder_entry

    # If it's a folder or an output, we can give a better error message.

    if folder_entry.type == nodetypes.Output or folder_entry.type == nodetypes.Mkdir:

      util.con_err(util.ConsoleRed, 'Folder "',

                   util.ConsoleBlue, folder_entry.path,

                   util.ConsoleRed, '" was never created.',

                   util.ConsoleNormal)

      raise Exception('path {0} was never created', folder_entry.path)

    util.con_err(util.ConsoleRed, 'Attempted to use node "',

                 util.ConsoleBlue, folder_entry.format(),

                 util.ConsoleRed, '" as a path component.',

                 util.ConsoleNormal)

    raise Exception('illegal path component')

  def parseOutput(self, cwd_entry, path, kind):

    if path[-1] == os.sep or path[-1] == os.altsep or path == '.' or path == '':

      util.con_err(util.ConsoleRed, 'Path "',

                   util.ConsoleBlue, path,

                   util.ConsoleRed, '" looks like a folder; a folder was not expected.',

                   util.ConsoleNormal)

      raise Exception('Expected folder, but path has a trailing slash')

    path = os.path.normpath(path)

    path, name = os.path.split(path)

    path = nodetypes.combine(cwd_entry, path)

    # We should have caught a case like 'x/' earlier.

    assert len(name)

    # If we resolved that there is no prefix path, then take this to mean the

    # root folder.

    if path:

      folder_entry = self.validateOutputFolder(path)

      output_path = os.path.join(path, name)

    else:

      folder_entry = None

      output_path = name

    entry = self.db.query_path(output_path)

    if not entry:

      if self.refactoring:

        util.con_err(util.ConsoleRed, 'New output file introduced: ',

                     util.ConsoleBlue, output_path,

                     util.ConsoleNormal)

        raise Exception('Refactoring error')

      return self.db.add_output(folder_entry, output_path, kind)

    if entry.type == kind:

      return entry

    if entry.type == nodetypes.Mkdir:

      if entry not in self.old_folders_:

        util.con_err(util.ConsoleRed, 'A folder is being re-used as an output file: "',

                     util.ConsoleBlue, entry.path,

                     util.ConsoleRed, '"',

                     util.ConsoleNormal)

        raise Exception('Attempted to re-use a folder as generated file')

      if self.refactoring:

        util.con_err(util.ConsoleRed, 'A generated folder has changed to a generated file: ',

                     util.ConsoleBlue, entry.path,

                     util.ConsoleNormal)

        raise Exception('Refactoring error')

      # We keep the node in old_folders_. This should be okay, since we've

      # changed the type to Output now. This way we can stick to one folder

      # deletion routine, since it's fairly complicated.

    elif entry.type == nodetypes.Output:

      # If we're asking for a shared output, make sure we can reuse this one.

      input_cmd = self.db.query_command_of(entry)

      if input_cmd and input_cmd not in self.old_commands_:

        util.con_err(util.ConsoleRed, 'First defined with command: ', input_cmd.format(), util.ConsoleNormal)

        raise Exception('Existing output cannot be a shared output: {0}'.format(entry.path))

      if self.refactoring:

        util.con_err(util.ConsoleRed, 'An output has changed to a shared output: ',

                     util.ConsoleBlue, entry.path,

                     util.ConsoleNormal)

        raise Exception('Refactoring error')

    elif entry.type == nodetypes.SharedOutput:

      input_cmds = self.db.query_shared_commands_of(entry)

      for input_cmd in input_cmds:

        if input_cmd not in self.old_commands_:

          util.con_err(util.ConsoleRed, 'A shared output cannot be specified as an normal output.',

                       util.ConsoleNormal)

          raise Exception('Existing shared output cannot be a normal output: {0}'.format(entry.path))

      if self.refactoring:

        util.con_err(util.ConsoleRed, 'A shared output has changed to a normal output: ',

                     util.ConsoleBlue, entry.path,

                     util.ConsoleNormal)

        raise Exception('Refactoring error')

    else:

      util.con_err(util.ConsoleRed, 'An existing node has been specified as an output file: "',

                   util.ConsoleBlue, entry.format(),

                   util.ConsoleRed, '"',

                   util.ConsoleNormal)

      raise Exception('Attempted to re-use an incompatible node as an output')

    self.db.change_to_output(entry, kind)

    return entry

  def parseInput(self, context, source):

    if util.IsString(source):

      if not os.path.isabs(source):

        source = os.path.join(context.currentSourcePath, source)

      source = os.path.normpath(source)

      entry = self.db.query_path(source)

      if not entry:

        return self.db.add_source(source)

      # Otherwise, we have to valid the node.

      source = entry

    if source.type == nodetypes.Source or source.type == nodetypes.Output:

      return source

    if source.type == nodetypes.Mkdir:

      if source not in self.bad_outputs_:

        util.con_err(util.ConsoleRed, 'Tried to use folder path ',

                     util.ConsoleBlue, source.path,

                     util.ConsoleRed, ' as a file path.',

                     util.ConsoleNormal)

        raise Exception('Tried to use folder path as a file path')

    util.con_err(util.ConsoleRed, 'Tried to use incompatible node "',

                 util.ConsoleBlue, source.format(),

                 util.ConsoleRed, '" as a file path.',

                 util.ConsoleNormal)

    raise Exception('Tried to use non-file node as a file path')

  def addCommand(self, context, node_type, folder, data, inputs, outputs,

                 weak_inputs=[], shared_outputs=[]):

    assert not folder or isinstance(folder, nodetypes.Entry)

    # Build the set of weak links.

    weak_links = set()

    for weak_input in weak_inputs:

      assert type(weak_input) is nodetypes.Entry

      assert weak_input.type != nodetypes.Source

      weak_links.add(weak_input)

    # Build the set of strong links.

    strong_links = set()

    for strong_input in inputs:

      strong_input = self.parseInput(context, strong_input)

      strong_links.add(strong_input)

    # Build the list of outputs.

    cmd_entry = None

    output_nodes = []

    for output in outputs:

      output_node = self.parseOutput(folder, output, nodetypes.Output)

      output_nodes.append(output_node)

      input_entry = self.db.query_command_of(output_node)

      if not input_entry:

        continue

      # Make sure this output won't be duplicated.

      if input_entry not in self.old_commands_:

        util.con_err(util.ConsoleRed, 'Command: ', input_entry.format(), util.ConsoleNormal)

        raise Exception('Output has been duplicated: {0}'.format(output_node.path))

      if not cmd_entry:

        cmd_entry = input_entry

    # end for

    # Build the list of shared outputs.

    shared_output_nodes = []

    for shared_output in shared_outputs:

      shared_output_node = self.parseOutput(folder, shared_output, nodetypes.SharedOutput)

      shared_output_nodes.append(shared_output_node)

    output_links = set(output_nodes)

    shared_links = set(shared_output_nodes)

    # There should be no duplicates in either output list. These error messages

    # could be better.

    if len(output_nodes) > len(output_links):

      util.con_err(util.ConsoleRed, 'The output list contains duplicate files.',

                   util.ConsoleNormal)

      raise Exception('Shared output list contains duplicate files.')

    if len(shared_output_nodes) > len(shared_links):

      util.con_err(util.ConsoleRed, 'The output list contains duplicate files.',

                   util.ConsoleNormal)

      raise Exception('Shared output list contains duplicate files.')

    # The intersection of output_links and shared_links should be the empty set.

    duplicates = output_links.intersection(shared_links)

    if len(duplicates):

      bad_entry = duplicates.pop()

      util.con_err(util.ConsoleRed, 'An output has been duplicated as a shared output: ',

                   util.ConsoleBlue, bad_entry.path,

                   util.ConsoleNormal)

      raise Exception('An output has been duplicated as a shared output.')

    if cmd_entry:

      # Update the entry in the database.

      self.db.update_command(cmd_entry, node_type, folder, data, self.refactoring)

      # Disconnect any outputs that are no longer connected to this output.

      # It's okay to use output_links since there should never be duplicate

      # outputs.

      for outgoing in self.db.query_strong_outgoing(cmd_entry):

        if outgoing not in output_links:

          self.db.drop_strong_edge(cmd_entry, outgoing)

          self.db.drop_output(outgoing)

        else:

          output_links.remove(outgoing)

      # Do the same for shared outputs. Since there is a many:1 relationship,

      # we can't drop shared outputs here. We save that for a cleanup step.

      for outgoing in self.db.query_shared_outputs(cmd_entry):

        if outgoing not in shared_links:

          self.db.drop_shared_output_edge(cmd_entry, outgoing)

        else:

          shared_links.remove(outgoing)

      # Remove us from the list of commands to delete.

      self.old_commands_.remove(cmd_entry)

    else:

      # Note that if there are no outputs, we will always add a new command,

      # and the old (identical) command will be deleted.

      cmd_entry = self.db.add_command(node_type, folder, data)

    # Local helper function to warn about refactoring problems.

    def refactoring_error(node):

      util.con_err(util.ConsoleRed, 'New input introduced: ',

                   util.ConsoleBlue, node.path + '\n',

                   util.ConsoleRed, 'Command: ',

                   util.ConsoleBlue, cmd_entry.format(),

                   util.ConsoleNormal)

      raise Exception('Refactoring error: new input introduced')

    if len(output_links) and self.refactoring:

      refactoring_error(output_links.pop())

    if len(shared_links) and self.refactoring:

      refactoring_error(shared_links.pop())

    # Connect each output.

    for output_node in output_links:

      self.db.add_strong_edge(cmd_entry, output_node)

    for shared_output_node in shared_links:

      self.db.add_shared_output_edge(cmd_entry, shared_output_node)

    # Connect/disconnect strong inputs.

    strong_inputs = self.db.query_strong_inputs(cmd_entry)

    strong_added = strong_links - strong_inputs

    strong_removed = strong_inputs - strong_links 

    if len(strong_added) and self.refactoring:

      refactoring_error(strong_added.pop())

    for strong_input in strong_added:

      self.db.add_strong_edge(strong_input, cmd_entry)

    for strong_input in strong_removed:

      self.db.drop_strong_edge(strong_input, cmd_entry)

    # Connect/disconnect weak inputs.

    weak_inputs = self.db.query_weak_inputs(cmd_entry)

    weak_added = weak_links - weak_inputs

    weak_removed = weak_inputs - weak_links 

    if len(weak_added) and self.refactoring:

      refactoring_error(weak_added.pop())

    for weak_input in weak_added:

      self.db.add_weak_edge(weak_input, cmd_entry)

    for weak_input in weak_removed:

      self.db.drop_weak_edge(weak_input, cmd_entry)

    # If we got new outputs or inputs, we need to re-run the command.

    changed = len(output_links) + len(strong_added) + len(weak_added)

    if changed and not cmd_entry.dirty:

      self.db.mark_dirty(cmd_entry)

    return cmd_entry, output_nodes

  def parseCxxDeps(self, context, binary, inputs, items):

    for val in items:

      if util.IsString(val):

        continue

      if type(val) is nodetypes.Entry:

        item = val

      elif util.IsLambda(val.node):

        item = val.node(context, binary)

      elif val.node is None:

        item = val.text

      else:

        item = val.node

      if type(item) is list:

        inputs.extend(item)

      else:

        inputs.append(item)

  def addCxxTasks(self, cx, binary):

    folder_node = self.generateFolder(cx.localFolder, binary.localFolder)

    # Find dependencies

    inputs = []

    self.parseCxxDeps(cx, binary, inputs, binary.compiler.linkflags)

    self.parseCxxDeps(cx, binary, inputs, binary.compiler.postlink)

    for objfile in binary.objects:

      cxxData = {

        'argv': objfile.argv,

        'type': binary.linker.behavior

      }

      cxxCmd, (cxxNode,) = self.addCommand(

        context = cx,