# Usefull library
library(tools)
library(dplyr)
library(officer)


# General information on station
iStatut = c('0'='inconnu', 
            '1'='station avec signification hydrologique', 
            '2'='station sans signification hydrologique', 
            '3'="station d'essai")

iFinalite = c('0'='inconnue', 
              '1'="hydrométrie générale", 
              '2'='alerte de crue', 
              '3'="hydrométrie générale et alerte de crue",
              '4'="gestion d'ouvrage", 
              '5'='police des eaux', 
              '6'="suivi d'étiage", 
              '7'='bassin expérimental', 
              '8'='drainage')

iType = c('0'='inconnu',
          '1'='une échelle',
          '2'='deux échelles, station mère',
          '3'='deux échelles, station fille',
          '4'='débits mesurés',
          '5'='virtuelle')

iInfluence = c('0'='inconnue',
               '1'='nulle ou faible',
               '2'='en étiage seulement',
               '3'='forte en toute saison')

iDebit = c('0'='reconstitué',
           '1'="réel (prise en compte de l'eau rajoutée ou retirée du bassin selon aménagements)",
           '2'='naturel')

iQBE = c('0'='qualité basses eaux inconnue',
         '1'='qualité basses eaux bonne',
         '2'='qualité basses eaux douteuse')

iQME = c('0'='qualité moyennes eaux inconnue',
         '1'='qualité moyennes eaux bonne',
         '2'='qualité moyennes eaux douteuse')

iQHE = c('0'='qualité hautes eaux inconnue',
         '1'='qualité hautes eaux bonne',
         '2'='qualité hautes eaux douteuse')


# Get the selection of data from the 'Liste-station_RRSE' file and the BanqueHydro directory
get_selection = function (computer_data_path, listdir, listname,
                          cnames=c('code','station', 'BV_km2', 'axe_principal_concerne', 'longueur_serie', 'commentaires', 'choix'), 
                          c_num=c('BV_km2', 'longueur_serie')) {
    
    # Get the file path to the data
    list_path = file.path(computer_data_path, listdir, listname)
    
    sample_data = read_docx(list_path)
    content = docx_summary(sample_data)
    table_cells <- content %>% filter(content_type == "table cell")
    table_data <- table_cells %>% filter(!is_header) %>% select(row_id, cell_id, text)
    # Split data into individual columns
    splits <- split(table_data, table_data$cell_id)
    splits <- lapply(splits, function(x) x$text)
    
    # Combine columns back together in wide format
    df_selec <- bind_cols(splits)
    
    df_selec = df_selec[-1,]
    
    names(df_selec) = cnames

    for (c in c_num) {
        df_selec$c = as.numeric(sub(",", ".",
                                    pull(df_selec, c)))
    }
    
    selec = (df_selec$choix == 'A garder' | df_selec$choix == 'Ajout')
    
    df_selec = bind_cols(df_selec, 
                         filename=paste(df_selec$code, '_HYDRO_QJM.txt', sep=''),
                         ok=selec
                         )
    
    return (df_selec)
}

# Example
# df_selec = get_selection(
#     "/home/louis/Documents/bouleau/INRAE/CDD_stationnarite/data",
#     "",
#     "Liste-station_RRSE.docx",
#     cnames=c('code','station', 
#              'BV_km2',
#              'axe_principal_concerne',
#              'longueur_serie',
#              'commentaires',
#              'choix'), 
#     c_num=c('BV_km2',
#              'longueur_serie'))


# Extraction of information
extractBH_info = function (computer_data_path, filedir, filename, verbose=TRUE) {
    
    # Convert the filename in vector
    filename = c(filename)
    
    # If the filename is 'all' or regroup more than one filename
    if (all(filename == 'all') | length(filename) > 1) {

        # If the filename is 'all'
        if (all(filename == 'all')) {
            # Create a filelist to store all the filename
            filelist = c()
            # Get all the filename in the data directory selected
            filelist_tmp = list.files(file.path(computer_data_path,
                                                filedir))
            
            # For all the filename in the directory selected
            for (f in filelist_tmp) {
                # If the filename extention is 'txt'
                if (file_ext(f) == 'txt') {
                    # Store the filename in the filelist
                    filelist = c(filelist, f) 
                }
            }

            # If the filename regroup more than one filename
        } else if (length(filename > 1)) {
            # The filelist correspond to the filename
            filelist = filename
        }
        
        # Create a blank data frame
        df_info = data.frame()
        
        # For all the file in the filelist
        for (f in filelist) {
            
            # Concatenate by raw data frames created by this function when filename correspond to only one filename
            df_info = rbind(df_info,
                            extractBH_info(computer_data_path, 
                                           filedir, 
                                           f))
        }
        
        # Set the rownames by default (to avoid strange numbering)
        rownames(df_info) = NULL
        return (df_info)
    }

    # Get the filename from the vector
    filename = filename[1]
    
    # Print information if asked
    if (verbose) {
        print(paste("extraction of info for file :", filename))
    }

    # Get the file path to the data
    file_path = file.path(computer_data_path, filedir, filename)

    
    if (file.exists(file_path)) {
        
        # Extract all the header
        infotxt = c(readLines(file_path, n=41))
        
        # Create a tibble with all the information needed
        df_info =
            tibble(code=trimws(substr(infotxt[11], 38, nchar(infotxt[11]))),
                   nom=trimws(substr(infotxt[12], 39, nchar(infotxt[12]))),
                   territoire=trimws(substr(infotxt[13], 39, nchar(infotxt[13]))),
                   L93X=as.numeric(substr(infotxt[16], 38, 50)),
                   L93Y=as.numeric(substr(infotxt[16], 52, 63)),
                   surface_km2=as.numeric(substr(infotxt[19], 38, 50)),
                   statut=iStatut[trimws(substr(infotxt[26], 38, 50))],
                   finalite=iFinalite[trimws(substr(infotxt[26], 52, 56))],
                   type=iType[trimws(substr(infotxt[26], 58, 58))],
                   influence=iInfluence[trimws(substr(infotxt[26], 60, 60))],
                   debit=iDebit[trimws(substr(infotxt[26], 62, 62))],
                   QBE=iQBE[trimws(substr(infotxt[26], 72, 72))],
                   QME=iQME[trimws(substr(infotxt[26], 74, 74))],
                   QHE=iQHE[trimws(substr(infotxt[26], 76, 76))],
                   file_path=file_path
                   )

        return (df_info)

    } else {
        print(paste('filename', file_path, 'do not exist'))
        return (NULL)
    }
}

# Example
# df_info = extractBH_info(
    # "/home/louis/Documents/bouleau/INRAE/CDD_stationnarite/data",
    # '',
    # c('H5920011_HYDRO_QJM.txt', 'K4470010_HYDRO_QJM.txt'))


# Extraction of data
extractBH_data = function (computer_data_path, filedir, filename, verbose=TRUE) {
    
    # Convert the filename in vector
    filename = c(filename)

    # If the filename is 'all' or regroup more than one filename
    if (all(filename == 'all') | length(filename) > 1) {

        # If the filename is 'all'
        if (all(filename == 'all')) {
            # Create a filelist to store all the filename
            filelist = c()
             # Get all the filename in the data directory selected
            filelist_tmp = list.files(file.path(computer_data_path,
                                                filedir))

            # For all the filename in the directory selected
            for (f in filelist_tmp) {
                # If the filename extention is 'txt'
                if (file_ext(f) == 'txt') {
                    # Store the filename in the filelist
                    filelist = c(filelist, f) 
                }
            }
            # If the filename regroup more than one filename
        } else if (length(filename > 1)) {
             # The filelist correspond to the filename
            filelist = filename
        } 

        # Create a blank data frame
        df_data = data.frame()

        # For all the file in the filelist
        for (f in filelist) {

            # Concatenate by raw data frames created by this function when filename correspond to only one filename
            df_data = rbind(df_data,
                            extractBH_data(computer_data_path, 
                                           filedir, 
                                           f))
        }

        # Set the rownames by default (to avoid strange numbering)
        rownames(df_data) = NULL
        return (df_data)
    }

    # Get the filename from the vector
    filename = filename[1]
    
    # Print information if asked
    if (verbose) {
        print(paste("extraction of data for file :", filename))
    }

    # Get the file path to the data
    file_path = file.path(computer_data_path, filedir, filename)
    
    if (file.exists(file_path)) {

        # Extract the data as a data frame
        df_data = read.table(file_path,
                             header=TRUE,
                             na.strings=c('     -99', ' -99.000'),
                             sep=';',
                             skip=41)   

        # Extract all the information for the station
        df_info = extractBH_info(computer_data_path, filedir, filename, verbose=FALSE)
        # Get the code of the station
        code = df_info$code
        # Create a tibble with the date as Date class and the code of the station
        df_data = tibble(Date=as.Date(as.character(df_data$Date),
                                      format="%Y%m%d"),
                         Qm3s=df_data$Qls * 1E-3,
                         df_data[-1:-2],
                         code=code)

        return (df_data)

    } else {
        print(paste('filename', file_path, 'do not exist'))
        return (NULL)
    }
}

# Example
# df_data = extractBH_data(
#     "/home/louis/Documents/bouleau/INRAE/CDD_stationnarite/data",
#     '',
#     c('H5920011_HYDRO_QJM.txt', 'K4470010_HYDRO_QJM.txt'))