# filepath: c:\Users\timon\Resilience BV\4020 SCane ESA DEMO - Documenten\General\4020 SCDEMO Team\4020 TechnicalData\WP3\smartcane\r_app\mosaic_creation.R
#
# MOSAIC_CREATION.R
# ===============
# This script creates weekly mosaics from daily satellite imagery.
# It handles command-line arguments and initiates the mosaic creation process.
#
# Usage: Rscript mosaic_creation.R [end_date] [offset] [project_dir] [file_name]
#   - end_date: End date for processing (YYYY-MM-DD format)
#   - offset: Number of days to look back from end_date
#   - project_dir: Project directory name (e.g., "chemba")
#   - file_name: Optional custom output file name
#

# 1. Load required packages
# -----------------------
suppressPackageStartupMessages({
  library(sf)
  library(terra)
  library(tidyverse)
  library(lubridate)
  library(here)
})

# 2. Process command line arguments and run mosaic creation
# ------------------------------------------------------
main <- function() {
  # Capture command line arguments
  args <- commandArgs(trailingOnly = TRUE)
  
    # Process project_dir argument with default
  if (length(args) >= 3 && !is.na(args[3])) {
    project_dir <- as.character(args[3])
  } else {
    # Default project directory
    project_dir <- "simba"
    message("No project_dir provided. Using default:", project_dir)
  }
  
  # Make project_dir available globally so parameters_project.R can use it
  assign("project_dir", project_dir, envir = .GlobalEnv)
  
  # Process end_date argument with default
  if (length(args) >= 1 && !is.na(args[1])) {
    end_date <- as.Date(args[1])
    if (is.na(end_date)) {
      message("Invalid end_date provided. Using current date.")
      end_date <- Sys.Date()
      #end_date <- "2025-07-22"  # Default date for testing
    }
  } else {
    # Default to current date if no argument is provided
    end_date <- Sys.Date()
    #end_date <-  "2025-07-08"   # Default date for testing
    message("No end_date provided. Using current date: ", format(end_date))
  }
  
  # Process offset argument with default
  if (length(args) >= 2 && !is.na(args[2])) {
    offset <- as.numeric(args[2])
    if (is.na(offset) || offset <= 0) {
      message("Invalid offset provided. Using default (7 days).")
      offset <- 7
    }
  } else {
    # Default to 7 days if no argument is provided
    offset <- 7
    message("No offset provided. Using default:", offset, "days")
  }
  

  
  # 3. Initialize project configuration
  # --------------------------------
  tryCatch({
    source("parameters_project.R")
    source("mosaic_creation_utils.R")
    safe_log(paste("Successfully sourced files from default directory."))
  }, error = function(e) {
    warning("Default source files not found. Attempting to source from 'r_app' directory.")
    tryCatch({
      source(here::here("r_app", "parameters_project.R"))
      source(here::here("r_app", "mosaic_creation_utils.R"))
      warning(paste("Successfully sourced files from 'r_app' directory."))
    }, error = function(e) {
      stop("Failed to source required files from both default and 'r_app' directories.")
    })
  })
  
  # 4. Generate date range for processing
  # ---------------------------------
  dates <- date_list(end_date, offset)  
  safe_log(paste("Processing data for week", dates$week, "of", dates$year))
  
  # Create output filename
  file_name_tif <- if (length(args) >= 4 && !is.na(args[4])) {
    as.character(args[4])
  } else {
    paste0("week_", sprintf("%02d", dates$week), "_", dates$year, ".tif")
  }
  
  safe_log(paste("Output will be saved as:", file_name_tif))
  
  # 5. Create weekly mosaic using the function from utils
  # -------------------------------------------------
  create_weekly_mosaic(
    dates = dates,
    field_boundaries = field_boundaries,
    daily_vrt_dir = daily_vrt,
    merged_final_dir = merged_final,
    output_dir = weekly_CI_mosaic,
    file_name_tif = file_name_tif,
    create_plots = TRUE
  )
}

if (sys.nframe() == 0) {
  main()
}