# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.

from collections import defaultdict
from operator import itemgetter

import mozpack.path as mozpath
from mozpack.manifests import InstallManifest

from mozbuild.backend.base import PartialBackend
from mozbuild.backend.make import MakeBackend
from mozbuild.frontend.context import ObjDirPath, Path
from mozbuild.frontend.data import (
    ChromeManifestEntry,
    FinalTargetFiles,
    FinalTargetPreprocessedFiles,
    GeneratedFile,
    JARManifest,
    LocalizedFiles,
    LocalizedPreprocessedFiles,
    XPIDLModule,
)
from mozbuild.makeutil import Makefile


class FasterMakeBackend(MakeBackend, PartialBackend):
    def _init(self):
        super()._init()

        self._manifest_entries = defaultdict(set)

        self._install_manifests = defaultdict(InstallManifest)

        self._dependencies = defaultdict(list)
        self._l10n_dependencies = defaultdict(list)

        self._has_xpidl = False

        self._generated_files_map = {}
        self._generated_files = []

    def _add_preprocess(self, obj, src, dest, f, **kwargs):
        basename = FinalTargetPreprocessedFiles.get_obj_basename(f)
        if basename.endswith(".css"):
            kwargs["marker"] = "%"
        depfile = mozpath.join(
            self.environment.topobjdir,
            "faster",
            ".deps",
            mozpath.join(obj.install_target, dest, basename).replace("/", "_"),
        )
        self._install_manifests[obj.install_target].add_preprocess(
            mozpath.join(obj.srcdir, src),
            mozpath.join(dest, basename),
            depfile,
            **kwargs,
        )

    def consume_object(self, obj):
        if isinstance(obj, JARManifest) and obj.install_target.startswith("dist/bin"):
            self._consume_jar_manifest(obj)

        elif isinstance(
            obj, (FinalTargetFiles, FinalTargetPreprocessedFiles)
        ) and obj.install_target.startswith("dist/bin"):
            ab_cd = self.environment.substs["MOZ_UI_LOCALE"]
            localized = isinstance(obj, (LocalizedFiles, LocalizedPreprocessedFiles))
            defines = obj.defines or {}
            if defines:
                defines = defines.defines
            for path, files in obj.files.walk():
                for f in files:
                    # For localized files we need to find the file from the locale directory.
                    if localized and not isinstance(f, ObjDirPath) and ab_cd != "en-US":
                        src = self.localized_path(obj.relsrcdir, f)

                        dep_target = "install-%s" % obj.install_target

                        if "*" not in src:
                            merge = mozpath.abspath(
                                mozpath.join(
                                    self.environment.topobjdir,
                                    "l10n_merge",
                                    obj.relsrcdir,
                                    f,
                                )
                            )
                            self._l10n_dependencies[dep_target].append((
                                merge,
                                f.full_path,
                                src,
                            ))
                            src = merge
                    else:
                        src = f.full_path

                    if isinstance(obj, FinalTargetPreprocessedFiles):
                        self._add_preprocess(obj, src, path, f, defines=defines)
                    elif "*" in f:

                        def _prefix(s):
                            for p in mozpath.split(s):
                                if "*" not in p:
                                    yield p + "/"

                        prefix = "".join(_prefix(src))

                        if "*" in f.target_basename:
                            target = path
                        else:
                            target = mozpath.join(path, f.target_basename)
                        self._install_manifests[obj.install_target].add_pattern_link(
                            prefix, src[len(prefix) :], target
                        )
                    else:
                        self._install_manifests[obj.install_target].add_link(
                            src, mozpath.join(path, f.target_basename)
                        )
                    if isinstance(f, ObjDirPath):
                        dep_target = "install-%s" % obj.install_target
                        dep = mozpath.relpath(f.full_path, self.environment.topobjdir)
                        if dep in self._generated_files_map:
                            # Only the first output file is specified as a
                            # dependency. If there are multiple output files
                            # from a single GENERATED_FILES invocation that are
                            # installed, we only want to run the command once.
                            dep = self._generated_files_map[dep]
                        self._dependencies[dep_target].append(dep)

        elif isinstance(obj, ChromeManifestEntry) and obj.install_target.startswith(
            "dist/bin"
        ):
            top_level = mozpath.join(obj.install_target, "chrome.manifest")
            if obj.path != top_level:
                entry = "manifest %s" % mozpath.relpath(obj.path, obj.install_target)
                self._manifest_entries[top_level].add(entry)
            self._manifest_entries[obj.path].add(str(obj.entry))

        elif isinstance(obj, GeneratedFile):
            if obj.outputs:
                first_output = mozpath.relpath(
                    mozpath.join(obj.objdir, obj.outputs[0]), self.environment.topobjdir
                )
                for o in obj.outputs[1:]:
                    fullpath = mozpath.join(obj.objdir, o)
                    self._generated_files_map[
                        mozpath.relpath(fullpath, self.environment.topobjdir)
                    ] = first_output
            self._generated_files.append(obj)
            return False

        elif isinstance(obj, XPIDLModule):
            self._has_xpidl = True
            # We're not actually handling XPIDL files.
            return False

        else:
            return False

        return True

    def consume_finished(self):
        mk = Makefile()
        # Add the default rule at the very beginning.
        mk.create_rule(["default"])
        mk.add_statement("TOPSRCDIR = %s" % self.environment.topsrcdir)
        mk.add_statement("TOPOBJDIR = %s" % self.environment.topobjdir)
        mk.add_statement("MDDEPDIR = .deps")
        mk.add_statement("TOUCH ?= touch")
        mk.add_statement("include $(TOPSRCDIR)/config/makefiles/functions.mk")
        mk.add_statement("include $(TOPSRCDIR)/config/AB_rCD.mk")
        mk.add_statement("AB_CD = en-US")
        if not self._has_xpidl:
            mk.add_statement("NO_XPIDL = 1")

        # Add a few necessary variables inherited from configure
        for var in (
            "PYTHON3",
            "ACDEFINES",
            "MOZ_BUILD_APP",
            "MOZ_WIDGET_TOOLKIT",
        ):
            value = self.environment.substs.get(var)
            if value is not None:
                mk.add_statement("%s = %s" % (var, value))

        install_manifests_bases = self._install_manifests.keys()

        # Add information for chrome manifest generation
        manifest_targets = []

        for target, entries in self._manifest_entries.items():
            manifest_targets.append(target)
            install_target = mozpath.basedir(target, install_manifests_bases)
            self._install_manifests[install_target].add_content(
                "".join("%s\n" % e for e in sorted(entries)),
                mozpath.relpath(target, install_target),
            )

        # Add information for install manifests.
        mk.add_statement(
            "INSTALL_MANIFESTS = %s" % " ".join(sorted(self._install_manifests.keys()))
        )

        # Add dependencies we inferred:
        for target, deps in sorted(self._dependencies.items()):
            mk.create_rule([target]).add_dependencies(
                "$(TOPOBJDIR)/%s" % d for d in sorted(deps)
            )

        # This is not great, but it's better to have some dependencies on this Python file.
        python_deps = [
            "$(TOPSRCDIR)/third_party/python/moz_l10n/moz/l10n/bin/build_file.py",
        ]
        # Add l10n dependencies we inferred:
        for target, deps in sorted(self._l10n_dependencies.items()):
            mk.create_rule([target]).add_dependencies(
                "%s" % d[0] for d in sorted(deps, key=itemgetter(0))
            )
            for merge, ref_file, l10n_file in deps:
                rule = mk.create_rule([merge]).add_dependencies(
                    [ref_file, l10n_file] + python_deps
                )
                rule.add_commands([
                    "$(PYTHON3) -m moz.l10n.bin.build_file "
                    f"--source {ref_file} --l10n {l10n_file} --target {merge}"
                ])
                # Add a dummy rule for the l10n file since it might not exist.
                mk.create_rule([l10n_file])

        mk.add_statement("include $(TOPSRCDIR)/config/faster/rules.mk")

        for base, install_manifest in self._install_manifests.items():
            with self._write_file(
                mozpath.join(
                    self.environment.topobjdir,
                    "faster",
                    "install_%s" % base.replace("/", "_"),
                )
            ) as fh:
                install_manifest.write(fileobj=fh)

        # Write a single unified manifest for consumption by |mach watch|.
        # Since this doesn't start 'install_', it's not processed by the build.
        unified_manifest = InstallManifest()
        for base, install_manifest in self._install_manifests.items():
            # Expect 'dist/bin/**', which includes 'dist/bin' with no trailing slash.
            assert base.startswith("dist/bin")
            base = base[len("dist/bin") :]
            if base and base[0] == "/":
                base = base[1:]
            unified_manifest.add_entries_from(install_manifest, base=base)

        with self._write_file(
            mozpath.join(
                self.environment.topobjdir, "faster", "unified_install_dist_bin"
            )
        ) as fh:
            unified_manifest.write(fileobj=fh)

        for obj in self._generated_files:
            for stmt in self._format_statements_for_generated_file(obj, "default"):
                mk.add_statement(stmt)

        with self._write_file(
            mozpath.join(self.environment.topobjdir, "faster", "Makefile")
        ) as fh:
            mk.dump(fh, removal_guard=False)

    def _pretty_path(self, path, obj):
        if path.startswith(self.environment.topobjdir):
            return mozpath.join(
                "$(TOPOBJDIR)", mozpath.relpath(path, self.environment.topobjdir)
            )
        elif path.startswith(self.environment.topsrcdir):
            return mozpath.join(
                "$(TOPSRCDIR)", mozpath.relpath(path, self.environment.topsrcdir)
            )
        else:
            return path

    def _format_generated_file_input_name(self, path, obj):
        return self._pretty_path(path.full_path, obj)

    def _format_generated_file_output_name(self, path, obj):
        if not isinstance(path, Path):
            path = ObjDirPath(obj._context, "!" + path)
        return self._pretty_path(path.full_path, obj)
