!Copyright (c) 2013 by tdem.org under guide of Xiu Li(lixiu@chd.edu.cn)
!written by Huaifeng Sun(sunhuaifeng@gmail.com) and Xushan Lu(luxushan@gmail.com)
!Code distribution @ tdem.org or sunhuaifeng.com

SUBROUTINE GETDATA
  USE CONSTANTPARAMETERS
  !this line is added by Huaifeng Sun to get the dir 2016-10-30
  USE IFPORT 
  IMPLICIT NONE
  LOGICAL ALIVE
  INTEGER TEMP_II,III
  !this following lines 10-21 are added by Huaifeng Sun to get the dir 2016-10-30
  CHARACTER(255) dir
  CHARACTER(255) InputFileName
  INTEGER(4) length
  length = GETDRIVEDIRQQ(dir)
  IF (length .GT. 0) THEN
      !WRITE (*,*) 'Current directory is: '
      !WRITE (*,*) dir
      InputFileName=trim(dir)//'//example//input.dat'
    ELSE
      WRITE (*,*) 'Failed to get current directory'
      pause
    END IF
    !the following inputfilename type are modified by HFSun 2016-10-30
  !INQUIRE(FILE='input.dat', EXIST=ALIVE)
  INQUIRE(FILE=InputFileName, EXIST=ALIVE)
  IF(.NOT. ALIVE) THEN
     WRITE(10005,*) "input.dat DOES NOT EXIST."
     STOP
  ELSE
     !OPEN(234,FILE='example/input.dat',STATUS='OLD')
     OPEN(234,FILE=InputFileName,STATUS='OLD')
     READ(234,'(a4)')CAL_TYPE   !This is the calculation type, possible values are shown below.
     IF(CAL_TYPE=='TUNNEL' .OR. CAL_TYPE=='tunnel')THEN
        WRITE(10005,*)'隧道模型计算开关设置正确！'
     ELSEIF(CAL_TYPE=='SEMI' .OR. CAL_TYPE=='semi')THEN
        WRITE(10005,*)'SEMI-AIRBORNE计算开关设置正确！'
     ELSEIF(CAL_TYPE=='GROUND' .OR. CAL_TYPE=='ground')THEN
        WRITE(10005,*)'地面模型计算开关设置正确！'
     ELSE
        WRITE(10005,*)'模型计算开关设置不正确，请确定采用地面模型还是隧道模型！'
        STOP
     ENDIF
     READ(234,*)SourceLength   
     !The length of source, unit of which is meter, and you are supposed to set SourceLengh/GridSize as an odd number for the consideration of there will exist a central point within the source loop.
     READ(234,*)NX,NY,NZ        !The value of Nx, Ny and Nz varies from model to model.
     READ(234,*)GridSize        !Most commonly used value is 10m
     READ(234,*)BACKGROUND_CONDUCTIVITY !Most commonly used value is 1e-2
     READ(234,*)TEMP_II                 !It depends on your model, and it should be set to 0 if you are doing homogeneous model calculation.
     ALLOCATE(TAR_X1(TEMP_II))
     ALLOCATE(TAR_X2(TEMP_II))
     ALLOCATE(TAR_Y1(TEMP_II))
     ALLOCATE(TAR_Y2(TEMP_II))
     ALLOCATE(TAR_Z1(TEMP_II))
     ALLOCATE(TAR_Z2(TEMP_II))
     ALLOCATE(TAR_CONDUCTIVITY(TEMP_II))
     DO III=1,TEMP_II
        READ(234,*)TAR_X1(III),TAR_X2(III)
        READ(234,*)TAR_Y1(III),TAR_Y2(III)
        READ(234,*)TAR_Z1(III),TAR_Z2(III)
        READ(234,*)TAR_CONDUCTIVITY(III)
     ENDDO
     READ(234,*)NSTOP           !The maximum iteration number.
     READ(234,*)MAX_OFF_TIME    !The maximum computation time, unit of which is ms
     READ(234,*)RAISETIME,RAISESTEP !Most commonly used value is: Raisetime=1e-6, Raisestep=1e-9
     READ(234,*)WAVE !,WAVESTEP
     READ(234,*)RAMP,RAMPSTEP   !Most commonly used value is: Ramp=1e-6, Rampstep=1e-9
     READ(234,*)TIMESTEP        !Most commonly used value is 1e-7
     READ(234,*)AMP             !It denotes the value of amplitude of transmitting source.
     read(234,*)NumRecHeights    !It is determined by your recording configuration
     allocate(FlightHeight(NumRecHeights),GridNumHeight(NumRecHeights),Nzs_Air(NumRecHeights))
     READ(234,*)(FlightHeight(iii),iii=1,NumRecHeights)
     READ(234,'(a12)')SOURCE_TYPE !Currently the only possible value of Source_type is 'TIXING_UPCOS'
     read(234,'(a2)')RecFlag      !Possible values are 'HE' and 'Hz'
     READ(234,*)NumRecLines
     read(234,*)RecPointMin,RecPointMax
     NumRecPoints=RecPointMax-RecPointMin+1
     IF(NumRecLines .EQ. 0)THEN
        WRITE(10005,*)'没有设置额外的接收点，程序继续运行！'
     ELSEIF(NumRecLines .GT. 0)THEN
        ALLOCATE(RecLine(NumRecLines),RecPoint(NumRecPoints))
        ELSE
        WRITE(10005,*)'额外接收点设置错误，请参阅输入数据文件格式说明，程序异常终止！'
        STOP
     ENDIF
     CLOSE(234)
  ENDIF
  do iii=1,NumRecHeights
     GridNumHeight(iii)=FlightHeight(iii)/GridSize  
  end do
  do iii=1,NumRecPoints,1
     RecPoint(iii)=iii+RecPointMin-1
  end do
  !计算CONSTANTPARAMETERS中的其他常数
  NXB=NX+1
  NYB=NY+1
  NZB=NZ+1 
  NXS=NX/2+1
  NYS=NY/2+1
  NZS=NZ/2
  do iii=1,NumRecHeights
     NZS_AIR(iii)=NZS-GridNumHeight(iii)
  end do
  do iii=1,NumRecLines,1
     RecLine(iii)=nxs-(NumRecLines-1)/2+iii-1
  end do
  !将电流转换成电流密度
  AMP=AMP/(GridSize*GridSize)
  SourceGridNum=int(SourceLength/GridSize)
  ALLOCATE(SOURCE(NSTOP))
ENDSUBROUTINE GETDATA