#!/bin/bash

# Go trough all the files available in this folder.
commonFiles=();
for sourceFile in .*; do

	# Exclude some files.
	if [[ "$sourceFile" == "install_unattended.sh" || "$sourceFile" == "install.sh" ]] || [[ "$sourceFile" == "README.md" ]] || [[ "$sourceFile" == "." ]] || [[ "$sourceFile" == ".." ]] || [[ "$sourceFile" == ".git" ]]; then
		continue;
	fi;

	# Set the target path for the source file.
	# We'll port them to the ~/ (home) directory.
	targetFile="$HOME/$sourceFile";

	# The file already exists.
	if [ -e "$targetFile" ]; then

		# The source and target point to the same file, continue.
		[ "$sourceFile" -ef "$targetFile" ] && continue;

		# The content of the file is the same, continue.
		diff -rq "$sourceFile" "$targetFile" > /dev/null 2>&1 && continue;

		# The source file is another file than our dotfile.
		# Store it in the commonFiles array so we can back it up.
		commonFiles+=("$sourceFile");

	fi;
done;

# Show the files that will be overwritten.
conflictCount=${#commonFiles[@]};
if [ $conflictCount -gt 0 ]; then

	# Create a suffix with a timestamp so the user can see which
	# files and when they've been backupped.
	backupSuffix=".jsVimconfig-$(date +'%Y%m%d-%H%M%S')";

	# Print some information about the replacement.
	tput setaf 3;
	printf "Warning: there are some files that will be overwritten.";
	tput sgr0;
	echo " Your files will be given the suffix $backupSuffix and will be" \
			"replaced by symlinks to the Dotfiles:";

	# Print the conflict files.
	for sourceFile in "${commonFiles[@]}"; do
		targetFile="$HOME/$sourceFile";
		echo "Yours: $targetFile";
		echo "Dotfiles: $sourceFile";
	done;

	# Make sure the user knows that we'll be replacing the old files.
	read -p "Would you like to overwrite the current files? (yes|no): ";
	case "$(tr '[:upper:]' '[:lower:]' <<< "$REPLY")" in
		'yes'|'y')
			# The user is sure, continue.
			;;
		'no'|'n')
			# The user isn't sure, abort.
			echo 'Aborting.';
			exit 1;
			;;
		*)
			# The user didn't type yes/no.
			echo 'Invalid answer. Assumed "no". Installation aborted.';
			exit 1;
	esac;
fi;

# Rename the conflicting files as backup.
for sourceFile in "${commonFiles[@]}"; do
	targetFile="$HOME/$sourceFile";
	mv -v "$targetFile" "$targetFile$backupSuffix";
done;

# Symlink the files in the home dir by those in the dotfiles repo.
for sourceFile in .*; do

	# Exclude some files.
	if [[ "$sourceFile" == "dotfiles-002.png" || "$sourceFile" == "dotfiles-001.png" || "$sourceFile" == "install.sh" ]] || [[ "$sourceFile" == "README.md" ]] || [[ "$sourceFile" == "." ]] || [[ "$sourceFile" == ".." ]] || [[ "$sourceFile" == ".git" ]]; then
		continue;
	fi;

	targetFile="$HOME/$sourceFile";

	# Delete the old file and replace it by the symlink.
	rm -rf "$targetFile" &&
	ln -vs "$PWD/$sourceFile" "$targetFile";
done;

# This will add a tag to our prompt, so we know which environment we're in.
touch ~/.bash_environment;
read -p "Please, enter your environment: ";
echo -e "export __prompt_environment='[$REPLY] '" | tee ~/.bash_environment > /dev/null;

echo "Done.";