/* valaccodefile.vala
 *
 * Copyright (C) 2009-2011  Jürg Billeter
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.

 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.

 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
 *
 * Author:
 * 	Jürg Billeter <j@bitron.ch>
 */


public class Vala.CCodeFile {
	public CCodeFileType file_type { get; private set; }

	public weak SourceFile? file { get; private set; }

	Set<string> features = new HashSet<string> (str_hash, str_equal);
	Set<string> declarations = new HashSet<string> (str_hash, str_equal);
	Set<string> definitions = new HashSet<string> (str_hash, str_equal);
	Set<string> includes = new HashSet<string> (str_hash, str_equal);
	CCodeFragment comments = new CCodeFragment ();
	CCodeFragment feature_test_macros = new CCodeFragment ();
	CCodeFragment define_directives = new CCodeFragment ();
	CCodeFragment include_directives = new CCodeFragment ();
	CCodeFragment type_declaration = new CCodeFragment ();
	CCodeFragment type_definition = new CCodeFragment ();
	CCodeFragment type_member_declaration = new CCodeFragment ();
	CCodeFragment constant_declaration = new CCodeFragment ();
	CCodeFragment type_member_definition = new CCodeFragment ();

	public CCodeFile (CCodeFileType type = CCodeFileType.SOURCE, SourceFile? source_file = null) {
		file = source_file;
		file_type = type;
	}

	public bool add_declaration (string name) {
		if (name in declarations) {
			return true;
		}
		declarations.add (name);
		return false;
	}

	public void add_comment (CCodeComment comment) {
		comments.append (comment);
	}

	public void add_feature_test_macro (string feature_test_macro) {
		if (!(feature_test_macro in features)) {
			feature_test_macros.append (new CCodeDefine (feature_test_macro));
			features.add (feature_test_macro);
		}
	}

	public void add_include (string filename, bool local = false) {
		if (!(filename in includes)) {
			include_directives.append (new CCodeIncludeDirective (filename, local));
			includes.add (filename);
		}
	}

	public void add_define (CCodeNode node) {
		define_directives.append (node);
	}

	public void add_type_declaration (CCodeNode node) {
		type_declaration.append (node);
	}

	public void add_type_definition (CCodeNode node) {
		type_definition.append (node);
	}

	public void add_type_member_declaration (CCodeNode node) {
		type_member_declaration.append (node);
	}

	public void add_constant_declaration (CCodeNode node) {
		constant_declaration.append (node);
	}

	public void add_type_member_definition (CCodeNode node) {
		type_member_definition.append (node);
	}

	public void add_function_declaration (CCodeFunction func) {
		declarations.add (func.name);

		var decl = func.copy ();
		decl.is_declaration = true;
		type_member_declaration.append (decl);
	}

	public void add_function (CCodeFunction func) {
		if (!definitions.add (func.name)) {
			Report.error (null, "internal: Redefinition of `%s'", func.name);
			return;
		}

		type_member_definition.append (func);
	}

	public List<string> get_symbols () {
		var symbols = new ArrayList<string> (str_equal);
		get_symbols_from_fragment (symbols, type_member_declaration);
		return symbols;
	}

	void get_symbols_from_fragment (List<string> symbols, CCodeFragment fragment) {
		foreach (CCodeNode node in fragment.get_children ()) {
			if (node is CCodeFragment) {
				get_symbols_from_fragment (symbols, (CCodeFragment) node);
			} else {
				var func = node as CCodeFunction;
				if (func != null) {
					symbols.add (func.name);
				}
			}
		}
	}

	static string get_define_for_filename (string filename) {
		var define = new StringBuilder ("__");

		var i = filename;
		while (i.length > 0) {
			var c = i.get_char ();
			if (c.isalnum  () && c < 0x80) {
				define.append_unichar (c.toupper ());
			} else {
				define.append_c ('_');
			}

			i = i.next_char ();
		}

		define.append ("__");

		return define.str;
	}

	public bool store (string filename, string? source_filename, bool write_version, bool line_directives, string? begin_decls = null, string? end_decls = null) {
		var writer = new CCodeWriter (filename, source_filename);
		if (!writer.open (write_version)) {
			return false;
		}

		if (file_type == CCodeFileType.SOURCE) {
			writer.line_directives = line_directives;

			comments.write (writer);
			writer.write_newline ();
			feature_test_macros.write (writer);
			writer.write_newline ();
			include_directives.write (writer);
			writer.write_newline ();
			define_directives.write (writer);
			writer.write_newline ();
			type_declaration.write_combined (writer);
			writer.write_newline ();
			type_definition.write_combined (writer);
			writer.write_newline ();
			type_member_declaration.write_declaration (writer);
			writer.write_newline ();
			type_member_declaration.write (writer);
			writer.write_newline ();
			constant_declaration.write_combined (writer);
			writer.write_newline ();
			type_member_definition.write (writer);
			writer.write_newline ();
		} else {
			writer.write_newline ();

			var once = new CCodeOnceSection (get_define_for_filename (writer.filename));
			once.append (new CCodeNewline ());
			once.append (include_directives);
			once.append (new CCodeNewline ());

			if (begin_decls != null) {
				once.append (new CCodeIdentifier (begin_decls));
				once.append (new CCodeNewline ());
			}

			once.append (new CCodeNewline ());
			once.append (define_directives);
			once.append (new CCodeNewline ());
			once.append (type_declaration);
			once.append (new CCodeNewline ());
			once.append (type_definition);
			once.append (new CCodeNewline ());
			once.append (type_member_declaration);
			once.append (new CCodeNewline ());
			once.append (constant_declaration);
			once.append (new CCodeNewline ());

			if (end_decls != null) {
				once.append (new CCodeIdentifier (end_decls));
				once.append (new CCodeNewline ());
			}

			once.append (new CCodeNewline ());
			once.write (writer);
		}

		writer.close ();

		return true;
	}
}

[Flags]
public enum CCodeFileType {
	SOURCE,
	PUBLIC_HEADER,
	INTERNAL_HEADER,
	HEADER = PUBLIC_HEADER | INTERNAL_HEADER
}