#ifndef SARAPP_H
#define SARAPP_H

#include <cstdio>

const size_t BUFFER_SIZE = 1024;


class SarApp
{
  private:
	/// True if search must ignore case
	bool caseSensitive;
	/// True if files must be overwritten after replace each search-text occurrence
	bool overwriteFiles;
	/// True if user wants to know each line in search results
	bool showLines;
	/// True if user asked only for help
	bool showHelp;
	/// Preservates the letter for a given unknown option
	char unknownParameter;
	/// The number of given filenames by user in parameters
	size_t fileCount;
	/// The text to search given by parameter. It is mandatory
	const char* searchText;
	/// The text to replace each occurence of searchText. NULL if user only wants to search
	const char* replacementText;
	/// Points to the replacement-text when it is not valid
	const char* badReplacementParameter;
	/// Name of the current file being processed
	const char* currentFilename;

  private:
	/// Analyzes each given parameter in main() and fills each data member of this object
	void processParams(int argc, char* argv[]);
	/// Analyzes if all parameters are a valid combination. Return 0 on success. On error
	/// prints a helpful message in stderr and returns an error value
	int validateParams();
	/// Searches or replaces in the given filename
	bool sarFile(const char* filename);
	/// Searches or replaces in the given open source file and target file
	bool sarFile(FILE* source, FILE* target);
	/// Searches or replaces in the given line from source file
	bool sarLine(const char* const line, FILE* target, size_t lineNumber);
	/// Returns true if two characters are equal considering the case chosen by user
	bool equals(char ch1, char ch2) const;
	/// This line has the search text, print it in stdout
	bool printOccurrence(const char* const line, FILE* target, size_t lineNumber);

  public:
	/// Constructor
	SarApp();
	/// Executes the search and replace and returns an error code
	int run(int argc, char* argv[]);
	/// Prints usage help in standard output
	static int printHelp();
};

#endif // SARAPP_H