#include "MultiFileAllocationIterator.h"

#include <algorithm>
#include <iostream>

#include <cppunit/extensions/HelperMacros.h>

#include "File.h"
#include "MultiDiskAdaptor.h"
#include "FileEntry.h"
#include "Exception.h"
#include "array_fun.h"
#include "TestUtil.h"
#include "DiskWriter.h"

namespace aria2 {

class MultiFileAllocationIteratorTest:public CppUnit::TestFixture {

  CPPUNIT_TEST_SUITE(MultiFileAllocationIteratorTest);
  CPPUNIT_TEST(testAllocate);
  CPPUNIT_TEST(testMakeDiskWriterEntries);
  CPPUNIT_TEST_SUITE_END();
private:

public:
  void setUp() {}

  void testAllocate();
  void testMakeDiskWriterEntries();
};


CPPUNIT_TEST_SUITE_REGISTRATION( MultiFileAllocationIteratorTest );

void MultiFileAllocationIteratorTest::testMakeDiskWriterEntries()
{
  std::string storeDir = A2_TEST_OUT_DIR"/aria2_MultiFileAllocationIteratorTest"
    "_testMakeDiskWriterEntries";

  std::shared_ptr<FileEntry> fs[] = {
    std::shared_ptr<FileEntry>(new FileEntry(storeDir+"/file1", 1536, 0)),
    std::shared_ptr<FileEntry>(new FileEntry(storeDir+"/file2", 2048, 1536)),// req no
    std::shared_ptr<FileEntry>(new FileEntry(storeDir+"/file3", 1024, 3584)),
    std::shared_ptr<FileEntry>(new FileEntry(storeDir+"/file4", 1024, 4608)),// req no
    std::shared_ptr<FileEntry>(new FileEntry(storeDir+"/file5", 1024, 5632)),// req no
    std::shared_ptr<FileEntry>(new FileEntry(storeDir+"/file6", 1024, 6656)),// req no
    std::shared_ptr<FileEntry>(new FileEntry(storeDir+"/file7",  256, 7680)),// req no
    std::shared_ptr<FileEntry>(new FileEntry(storeDir+"/file8",  255, 7936)),
    std::shared_ptr<FileEntry>(new FileEntry(storeDir+"/file9", 1025, 8191)),// req no
    std::shared_ptr<FileEntry>(new FileEntry(storeDir+"/fileA", 1024, 9216)),// req no
    std::shared_ptr<FileEntry>(new FileEntry(storeDir+"/fileB", 1024, 10240)),
  };
  fs[1]->setRequested(false); // file2
  fs[3]->setRequested(false); // file4
  fs[4]->setRequested(false); // file5
  fs[5]->setRequested(false); // file6
  fs[6]->setRequested(false); // file7
  fs[8]->setRequested(false); // file9
  fs[9]->setRequested(false); // fileA


  // create empty file4
  createFile(storeDir+std::string("/file4"), 0);

  std::shared_ptr<MultiDiskAdaptor> diskAdaptor(new MultiDiskAdaptor());
  diskAdaptor->setFileEntries(vbegin(fs), vend(fs));
  diskAdaptor->setPieceLength(1024);
  diskAdaptor->openFile();

  auto itr = std::dynamic_pointer_cast<MultiFileAllocationIterator>
    (diskAdaptor->fileAllocationIterator());

  const std::deque<std::shared_ptr<DiskWriterEntry> >& entries =
    itr->getDiskWriterEntries();

  CPPUNIT_ASSERT_EQUAL((size_t)11, entries.size());

  // file1
  CPPUNIT_ASSERT_EQUAL(storeDir+std::string("/file1"),
                       entries[0]->getFilePath());
  CPPUNIT_ASSERT(entries[0]->needsFileAllocation());
  CPPUNIT_ASSERT(entries[0]->getDiskWriter());
  // file2
  CPPUNIT_ASSERT_EQUAL(storeDir+std::string("/file2"),
                       entries[1]->getFilePath());
  CPPUNIT_ASSERT(entries[1]->needsFileAllocation());
  CPPUNIT_ASSERT(entries[1]->getDiskWriter());
  // file3
  CPPUNIT_ASSERT_EQUAL(storeDir+std::string("/file3"),
                       entries[2]->getFilePath());
  CPPUNIT_ASSERT(entries[2]->needsFileAllocation());
  CPPUNIT_ASSERT(entries[2]->getDiskWriter());
  // file4, diskWriter is not null, because file exists.
  CPPUNIT_ASSERT_EQUAL(storeDir+std::string("/file4"),
                       entries[3]->getFilePath());
  CPPUNIT_ASSERT(!entries[3]->needsFileAllocation());
  CPPUNIT_ASSERT(entries[3]->getDiskWriter());
  // file5
  CPPUNIT_ASSERT_EQUAL(storeDir+std::string("/file5"),
                       entries[4]->getFilePath());
  CPPUNIT_ASSERT(!entries[4]->needsFileAllocation());
  CPPUNIT_ASSERT(!entries[4]->getDiskWriter());
  // file6
  CPPUNIT_ASSERT_EQUAL(storeDir+std::string("/file6"),
                       entries[5]->getFilePath());
  CPPUNIT_ASSERT(entries[5]->needsFileAllocation());
  CPPUNIT_ASSERT(entries[5]->getDiskWriter());
  // file7
  CPPUNIT_ASSERT_EQUAL(storeDir+std::string("/file7"),
                       entries[6]->getFilePath());
  CPPUNIT_ASSERT(entries[6]->needsFileAllocation());
  CPPUNIT_ASSERT(entries[6]->getDiskWriter());
  // file8
  CPPUNIT_ASSERT_EQUAL(storeDir+std::string("/file8"),
                       entries[7]->getFilePath());
  CPPUNIT_ASSERT(entries[7]->needsFileAllocation());
  CPPUNIT_ASSERT(entries[7]->getDiskWriter());
  // file9
  CPPUNIT_ASSERT_EQUAL(storeDir+std::string("/file9"),
                       entries[8]->getFilePath());
  CPPUNIT_ASSERT(!entries[8]->needsFileAllocation());
  CPPUNIT_ASSERT(entries[8]->getDiskWriter());
  // fileA
  CPPUNIT_ASSERT_EQUAL(storeDir+std::string("/fileA"),
                       entries[9]->getFilePath());
  CPPUNIT_ASSERT(!entries[9]->needsFileAllocation());
  CPPUNIT_ASSERT(!entries[9]->getDiskWriter());
  // fileB
  CPPUNIT_ASSERT_EQUAL(storeDir+std::string("/fileB"),
                       entries[10]->getFilePath());
  CPPUNIT_ASSERT(entries[10]->needsFileAllocation());
  CPPUNIT_ASSERT(entries[10]->getDiskWriter());
}

void MultiFileAllocationIteratorTest::testAllocate()
{
  std::string storeDir =
    A2_TEST_OUT_DIR"/aria2_MultiFileAllocationIteratorTest_testAllocate";

  std::string fname1 = "file1";
  std::string fname2 = "file2";
  std::string fname3 = "file3";
  std::string fname4 = "file4";
  std::string fname5 = "file5";
  std::string fname6 = "file6";
  int64_t length1 = 32769;
  int64_t length2 = 0;
  int64_t length3 = 8;
  int64_t length4 = 10;
  int64_t length5 = 20;
  int64_t length6 = 30;

  try {
    std::shared_ptr<MultiDiskAdaptor> diskAdaptor(new MultiDiskAdaptor());
    diskAdaptor->setPieceLength(1);

    int64_t offset = 0;
    std::shared_ptr<FileEntry> fileEntry1(new FileEntry(storeDir+"/"+fname1,
                                                     length1,
                                                     offset));
    offset += length1;
    std::shared_ptr<FileEntry> fileEntry2(new FileEntry(storeDir+"/"+fname2,
                                                     length2,
                                                     offset));

    offset += length2;
    std::shared_ptr<FileEntry> fileEntry3(new FileEntry(storeDir+"/"+fname3,
                                                     length3,
                                                     offset));

    offset += length3;
    std::shared_ptr<FileEntry> fileEntry4(new FileEntry(storeDir+"/"+fname4,
                                                     length4,
                                                     offset));
    fileEntry4->setRequested(false);

    offset += length4;
    std::shared_ptr<FileEntry> fileEntry5(new FileEntry(storeDir+"/"+fname5,
                                                     length5,
                                                     offset));

    offset += length5;
    std::shared_ptr<FileEntry> fileEntry6(new FileEntry(storeDir+"/"+fname6,
                                                     length6,
                                                     offset));
    fileEntry6->setRequested(false);

    std::vector<std::shared_ptr<FileEntry> > fs;
    fs.push_back(fileEntry1);
    fs.push_back(fileEntry2);
    fs.push_back(fileEntry3);
    fs.push_back(fileEntry4);
    fs.push_back(fileEntry5);
    fs.push_back(fileEntry6);
    diskAdaptor->setFileEntries(fs.begin(), fs.end());

    for(std::vector<std::shared_ptr<FileEntry> >::const_iterator i = fs.begin();
        i != fs.end(); ++i) {
      File((*i)->getPath()).remove();
    }

    // we have to open file first.
    diskAdaptor->initAndOpenFile();
    auto itr = std::dynamic_pointer_cast<MultiFileAllocationIterator>
      (diskAdaptor->fileAllocationIterator());
    while(!itr->finished()) {
      itr->allocateChunk();
    }
    CPPUNIT_ASSERT_EQUAL((int64_t)length1, File(fileEntry1->getPath()).size());
    CPPUNIT_ASSERT_EQUAL((int64_t)length2, File(fileEntry2->getPath()).size());
    CPPUNIT_ASSERT_EQUAL((int64_t)length3, File(fileEntry3->getPath()).size());
    CPPUNIT_ASSERT(!File(fileEntry4->getPath()).isFile());
    CPPUNIT_ASSERT_EQUAL((int64_t)length5, File(fileEntry5->getPath()).size());
    CPPUNIT_ASSERT(!File(fileEntry6->getPath()).isFile());
  } catch(Exception& e) {
    CPPUNIT_FAIL(e.stackTrace());
  }
}

} // namespace aria2