// Copyright (c) 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef TOOLS_GN_GYP_TARGET_WRITER_H_
#define TOOLS_GN_GYP_TARGET_WRITER_H_

#include <iosfwd>
#include <vector>

#include "base/basictypes.h"
#include "tools/gn/gyp_helper.h"
#include "tools/gn/path_output.h"

class BuilderRecord;
class Err;
class Settings;
class SourceFile;
class Target;
class Toolchain;

class GypTargetWriter {
 public:
  struct TargetGroup {
    TargetGroup();

    // Returns "a" record associated with this group. This is used when getting
    // general things like the sources list that should be the same across all
    // records in a group.
    const BuilderRecord* get() const {
      // We assume we always have either a host or a target debug build.
      return debug ? debug : host_debug;
    }

    const BuilderRecord* debug;
    const BuilderRecord* release;

    // When the main compile is targeting a different architecture, these will
    // contain the builds with the host system's toolchain. Only supported on
    // Linux.
    const BuilderRecord* host_debug;
    const BuilderRecord* host_release;

    // On Windows, we do both 32-bit and 64-bit builds. Null on non-Windows.
    const BuilderRecord* debug64;
    const BuilderRecord* release64;

    // On Mac/iOS, there are some nontrivial differences between the GYP Ninja
    // build and the GYP XCode build. In GYP, these are parameterized as
    // conditions using the generator flag. To emulate this, we have different
    // builds for the XCode and Ninja versions of the GYP file, and the
    // generator wraps everything in a big condition so that GYP does the right
    // thing.
    //
    // These refer to the GYP-XCode build. The "regular" debug and release
    // targets above refer to the GYP-Ninja build.
    const BuilderRecord* xcode_debug;
    const BuilderRecord* xcode_release;

    // Optional host versions of the xcode config when cross-compiling to iOS.
    const BuilderRecord* xcode_host_debug;
    const BuilderRecord* xcode_host_release;
  };

  GypTargetWriter(const Target* target,
                  const Toolchain* toolchain,
                  const SourceDir& gyp_dir,
                  std::ostream& out);
  virtual ~GypTargetWriter();

  static void WriteFile(const SourceFile& gyp_file,
                        const std::vector<TargetGroup>& targets,
                        const Toolchain* debug_toolchain,
                        Err* err);

  virtual void Run() = 0;

 protected:
  // Writes the given number of spaces to the output stream and returns it.
  std::ostream& Indent(int spaces);
  static std::ostream& Indent(std::ostream& out, int spaces);

  static const int kExtraIndent = 2;

  const Settings* settings_;  // Non-owning.
  const Target* target_;  // Non-owning.
  const Toolchain* toolchain_;  // Toolchain corresponding to target_.
  SourceDir gyp_dir_;  // Dir of GYP file.
  std::ostream& out_;

  GypHelper helper_;
  PathOutput path_output_;

 private:
  DISALLOW_COPY_AND_ASSIGN(GypTargetWriter);
};

#endif  // TOOLS_GN_GYP_TARGET_WRITER_H_