#######################  Assessment of product part 2 functions: mosaic and accuracy ##############################

#This part 2 of the product assessment focuses on graphics to explore the spatial patterns of raster times series as figures.

#The file contains functions to genrate figures and animation (movie).

#CREATED ON: 10/03/2016  

#MODIFIED ON: 10/22/2016            

#Version: 2

pre_process_raster_mosaic_fun <- function(i,list_param){

  ## Extract parameters

  lf <- list_param$lf

  python_bin <- list_param$python_bin

  infile_mask <- list_param$infile_mask

  scaling <- list_param$scaling

  mask_pred <- list_param$mask_pred

  matching <- list_param$matching

  NA_flag_val <- list_param$NA_flag_val

  out_suffix <- list_param$out_suffix

  out_dir <- list_param$out_dir

  raster_name_in <- lf[i]

  #Step 1: match extent and resolution

  if(matching==TRUE){

    lf_files <- c(raster_name_in) #match to mask

    rast_ref <- infile_mask

    ##Maching resolution is probably only necessary for the r mosaic function

    #Modify later to take into account option R or python...

    list_param_raster_match <- list(lf_files,rast_ref,file_format,python_bin,out_suffix,out_dir)

    names(list_param_raster_match) <- c("lf_files","rast_ref","file_format","python_bin","out_suffix","out_dir_str")

    r_pred_matched <- raster_match(1,list_param_raster_match)

    raster_name_in <- c(r_pred_matched)

  }

  #Step 2: mask

  if(mask_pred==TRUE){

    r_mask <- raster(infile_mask)

    extension_str <- extension(raster_name_in)

    raster_name_tmp <- gsub(extension_str,"",basename(raster_name_in))

    raster_name <- file.path(out_dir,paste(raster_name_tmp,"_masked.tif",sep = ""))

    r_pred <- mask(raster(raster_name_in),r_mask,filename = raster_name,overwrite = TRUE)

  }

  NAvalue(r_pred) <- NA_flag_val

  #r_pred <- setMinMax(r_pred)

  #Step 3: remove scaling factor

  raster_name_in <- filename(r_pred)

  extension_str <- extension(raster_name_in)

  raster_name_tmp <- gsub(extension_str,"",basename(filename(r_pred)))

  raster_name_out <- file.path(out_dir,paste(raster_name_tmp,"_rescaled.tif",sep = ""))

  #r_pred <- overlay(r_pred, fun=function(x){x*1/scaling},filename=raster_name,overwrite=T)

  #raster_name_in <- "comp_r_m_use_edge_weights_weighted_mean_gam_CAI_dailyTmax_19990102_reg4_1999_m_gam_CAI_dailyTmax_19990102_reg4_1999_m__meeting_NASA_reg4_04292016_masked.tif"

  python_cmd <- file.path(python_bin,"gdal_calc.py")

  cmd_str3 <- paste(python_cmd, 

                     paste("-A ", raster_name_in,sep=""),

                     paste("--outfile=",raster_name_out,sep=""),

                     #paste("--type=","Int32",sep=""),

                     "--co='COMPRESS=LZW'",

                     paste("--NoDataValue=",NA_flag_val,sep=""),

                     paste("--calc='(A)*",scaling,"'",sep=""),

                     "--overwrite",sep=" ") #division by zero is problematic...

  #system(cmd_str3)

  system(cmd_str3)

  #NAvalue(r_pred) <- NA_flag_val

  #r_pred <- 

  r_pred <- setMinMax(raster(raster_name_out))

  return(raster_name_out)

}

plot_raster_mosaic <- function(i,list_param){

  #Function to plot raster image

  #

  #INPUTS

  #1) l_dates

  #2) r_stack

  #3) NA_flag_val

  #4) out_dir,

  #5) out_suffix_str

  #6) region_name

  #7) variable_name

  #8) zlim_val

  #

  ############# Start script #########

  l_dates <- list_param$l_dates

  r_mosaiced_scaled <- list_param$r_mosaiced_scaled

  NA_flag_val <- list_param$NA_flag_val

  out_dir <- list_param$out_dir

  out_suffix <- list_param$out_suffix

  region_name <- list_param$region_name

  variable_name <- list_param$variable_name

  zlim_val <- list_param$zlim_val

  #for (i in 1:length(nlayers(r_mosaic_scaled))){

  date_proc <- l_dates[i]

  r_pred <- subset(r_mosaiced_scaled,i)

  NAvalue(r_pred)<- NA_flag_val 

  raster_name <- filename(r_pred)

  extension_str <- extension(raster_name)

  raster_name_tmp <- gsub(extension_str,"",basename(raster_name))

  date_proc <- l_dates[i]

  if(class(date_proc)!="Date"){

    date_val <- as.Date(strptime(date_proc,"%Y%m%d"))

    #month_name <- month.name(date_val)

  }else{

    date_val <- date_proc

  }

  month_str <- format(date_val, "%b") ## Month, char, abbreviated

  year_str <- format(date_val, "%Y") ## Year with century

  day_str <- as.numeric(format(date_val, "%d")) ## numeric month

  date_str <- paste(month_str," ",day_str,", ",year_str,sep="")

  res_pix <- 1200

  #res_pix <- 480

  col_mfrow <- 1

  row_mfrow <- 1

  if(is.null(zlim_val)){

    if(is.na(minValue(r_pred))){

      r_pred <- setMinMax(r_pred)

    }

    zlim_val_str <- paste(c(minValue(r_pred),maxValue(r_pred)),sep="_",collapse="_")

    #png_filename <-  file.path(out_dir,paste("Figure4_clim_mosaics_day_","_",date_proc,"_",region_name,"_zlim_",zlim_val_str,"_",out_suffix,".png",sep =""))

    #raster_name_tmp

    png_filename <-  file.path(out_dir,paste("Figure_",raster_name_tmp,"_zlim_",zlim_val_str,"_",out_suffix,".png",sep =""))

    title_str <-  paste("Predicted ",variable_name, " on ",date_str , " ", sep = "")

    #browser()

    png(filename=png_filename,width = col_mfrow * res_pix,height = row_mfrow * res_pix)

    plot(r_pred,main =title_str,cex.main =1.5,col=matlab.like(255),

       legend.shrink=0.8,legend.width=0.8)

       #axis.args = list(cex.axis = 1.6), #control size of legend z

       #legend.args=list(text='dNBR', side=4, line=2.5, cex=2.2))

       #legend.args=list(text='dNBR', side=4, line=2.49, cex=1.6))

    dev.off()

  }else{

    zlim_val_str <- paste(zlim_val,sep="_",collapse="_")

    #png_filename <-  file.path(out_dir,paste("Figure_mosaics_day_","_",date_proc,"_",region_name,"_",zlim_val_str,"_",out_suffix,".png",sep =""))

    png_filename <-  file.path(out_dir,paste("Figure_",raster_name_tmp,"_zlim_",zlim_val_str,"_",out_suffix,".png",sep =""))

    title_str <-  paste("Predicted ",variable_name, " on ",date_str , " ", sep = "")

    png(filename=png_filename,width = col_mfrow * res_pix,height = row_mfrow * res_pix)

    plot(r_pred,main =title_str,cex.main =1.5,col=matlab.like(255),zlim=zlim_val,

       legend.shrink=0.8,legend.width=0.8)

       #axis.args = list(cex.axis = 1.6), #control size of legend z

       #legend.args=list(text='dNBR', side=4, line=2.5, cex=2.2))

       #legend.args=list(text='dNBR', side=4, line=2.49, cex=1.6))

    dev.off()

  }

  return(png_filename)

}

extract_date <- function(i,x,item_no=NULL){

  y <- unlist(strsplit(x[[i]],"_"))

  if(is.null(item_no)){

    date_str <- y[length(y)-2] #count from end

  }else{

    date_str <- y[item_no]

  }

  return(date_str)

}

finding_missing_dates <- function(date_start,date_end,list_dates){

  #this assumes daily time steps!!

  #can be improved later on

  #date_start <- "19840101"

  #date_end <- "19991231"

  date1 <- as.Date(strptime(date_start,"%Y%m%d"))

  date2 <- as.Date(strptime(date_end,"%Y%m%d"))

  dates_range <- seq.Date(date1, date2, by="1 day") #sequence of dates

  missing_dates <- setdiff(as.character(dates_range),as.character(list_dates))

  #df_dates_missing <- data.frame(date=missing_dates)

  #which(df_dates$date%in%missing_dates)

  #df_dates_missing$missing <- 1

  df_dates <- data.frame(date=as.character(dates_range),missing = 0) 

  df_dates$missing[df_dates$date %in% missing_dates] <- 1

  #a$flag[a$id %in% temp] <- 1

  missing_dates_obj <- list(missing_dates,df_dates)

  names(missing_dates_obj) <- c("missing_dates","df_dates")

  return(missing_dates_obj)

}