/*
  Copyright (c) 2022 Alex Diener
  
  This software is provided 'as-is', without any express or implied
  warranty. In no event will the authors be held liable for any damages
  arising from the use of this software.
  
  Permission is granted to anyone to use this software for any purpose,
  including commercial applications, and to alter it and redistribute it
  freely, subject to the following restrictions:
  
  1. The origin of this software must not be misrepresented; you must not
     claim that you wrote the original software. If you use this software
     in a product, an acknowledgment in the product documentation would be
     appreciated but is not required.
  2. Altered source versions must be plainly marked as such, and must not be
     misrepresented as being the original software.
  3. This notice may not be removed or altered from any source distribution.
  
  Alex Diener alex@ludobloom.com
*/

#include "document/DocumentFilesystemInterface.h"
#include "shell/Shell.h"
#include "utilities/AutoFreePool.h"
#include "utilities/IOUtilities.h"
#include <string.h>

#define stemobject_implementation DocumentFilesystemInterface

stemobject_vtable_begin();
stemobject_vtable_entry(dispose);
stemobject_vtable_end();

DocumentFilesystemInterface * DocumentFilesystemInterface_create(const char * typeDescription, const char * preferredExtension, ...) {
	va_list args;
	va_start(args, preferredExtension);
	DocumentFilesystemInterface * self = DocumentFilesystemInterface_vcreate(typeDescription, preferredExtension, args);
	va_end(args);
	return self;
}

DocumentFilesystemInterface * DocumentFilesystemInterface_vcreate(const char * typeDescription, const char * preferredExtension, va_list args) {
	stemobject_create_implementation(vinit, typeDescription, preferredExtension, args)
}

DocumentFilesystemInterface * DocumentFilesystemInterface_createWithSeparateTypes(const char * openTypeDescription, unsigned int openExtensionCount, const char ** openExtensions, const char * saveTypeDescription, unsigned int saveExtensionCount, const char ** saveExtensions) {
	stemobject_create_implementation(initWithSeparateTypes, openTypeDescription, openExtensionCount, openExtensions, saveTypeDescription, saveExtensionCount, saveExtensions)
}

bool DocumentFilesystemInterface_init(DocumentFilesystemInterface * self, const char * typeDescription, const char * preferredExtension, ...) {
	va_list args;
	va_start(args, preferredExtension);
	bool success = DocumentFilesystemInterface_vinit(self, typeDescription, preferredExtension, args);
	va_end(args);
	return success;
}

bool DocumentFilesystemInterface_vinit(DocumentFilesystemInterface * self, const char * typeDescription, const char * preferredExtension, va_list args) {
	call_super(init, self);
	unsigned int extensionCount = 1;
	va_list copy;
	va_copy(copy, args);
	while (va_arg(copy, const char *) != NULL) {
		extensionCount++;
	}
	va_end(copy);
	const char * extensions[extensionCount];
	extensions[0] = preferredExtension;
	for (unsigned int extensionIndex = 1; extensionIndex < extensionCount; extensionIndex++) {
		extensions[extensionIndex] = va_arg(args, const char *);
	}
	return DocumentFilesystemInterface_initWithSeparateTypes(self, typeDescription, extensionCount, extensions, typeDescription, extensionCount, extensions);
}

static char * createTypeDescriptionString(const char * typeDescription, unsigned int extensionCount, const char ** extensions) {
	size_t typeDescriptionLength = strlen(typeDescription);
	size_t extensionLength = strlen(extensions[0]);
	size_t typeDescriptionTotalLength = typeDescriptionLength + 5 + extensionLength;
	for (unsigned int extensionIndex = 1; extensionIndex < extensionCount; extensionIndex++) {
		typeDescriptionTotalLength += strlen(extensions[extensionIndex]) + 4;
	}
	char * string = malloc(typeDescriptionTotalLength + 1);
	memcpy(string, typeDescription, typeDescriptionLength);
	memcpy(string + typeDescriptionLength, " (*.", 4);
	memcpy(string + typeDescriptionLength + 4, extensions[0], extensionLength);
	typeDescriptionLength += 4 + extensionLength;
	for (unsigned int extensionIndex = 1; extensionIndex < extensionCount; extensionIndex++) {
		memcpy(string + typeDescriptionLength, ", *.", 4);
		extensionLength = strlen(extensions[extensionIndex]);
		memcpy(string + typeDescriptionLength + 4, extensions[extensionIndex], extensionLength);
		typeDescriptionLength += 4 + extensionLength;
	}
	string[typeDescriptionLength] = ')';
	string[typeDescriptionLength + 1] = 0;
	return string;
}

bool DocumentFilesystemInterface_initWithSeparateTypes(DocumentFilesystemInterface * self, const char * openTypeDescription, unsigned int openExtensionCount, const char ** openExtensions, const char * saveTypeDescription, unsigned int saveExtensionCount, const char ** saveExtensions) {
	call_super(init, self);
	self->openExtensionCount = openExtensionCount;
	self->openExtensions = malloc(openExtensionCount * sizeof(*self->openExtensions));
	for (unsigned int extensionIndex = 0; extensionIndex < openExtensionCount; extensionIndex++) {
		self->openExtensions[extensionIndex] = strdup(openExtensions[extensionIndex]);
	}
	self->openTypeDescriptionString = createTypeDescriptionString(openTypeDescription, openExtensionCount, openExtensions);
	
	if (saveExtensionCount == openExtensionCount && saveExtensions == openExtensions) {
		self->saveExtensionCount = self->openExtensionCount;
		self->saveExtensions = self->openExtensions;
		if (openTypeDescription == saveTypeDescription) {
			self->saveTypeDescriptionString = self->openTypeDescriptionString;
		} else {
			self->saveTypeDescriptionString = createTypeDescriptionString(saveTypeDescription, saveExtensionCount, saveExtensions);
		}
	} else {
		self->saveExtensionCount = saveExtensionCount;
		self->saveExtensions = malloc(saveExtensionCount * sizeof(*self->saveExtensions));
		for (unsigned int extensionIndex = 0; extensionIndex < saveExtensionCount; extensionIndex++) {
			self->saveExtensions[extensionIndex] = strdup(saveExtensions[extensionIndex]);
		}
		self->saveTypeDescriptionString = createTypeDescriptionString(saveTypeDescription, saveExtensionCount, saveExtensions);
	}
	self->fileName = NULL;
	self->directory = NULL;
	self->fileExists = false;
	self->preferredSaveExtensionIndex = 0;
	return true;
}

void DocumentFilesystemInterface_dispose(DocumentFilesystemInterface * self) {
	free(self->openTypeDescriptionString);
	for (unsigned int extensionIndex = 0; extensionIndex < self->openExtensionCount; extensionIndex++) {
		free(self->openExtensions[extensionIndex]);
	}
	free(self->openExtensions);
	if (self->saveTypeDescriptionString != self->openTypeDescriptionString) {
		free(self->saveTypeDescriptionString);
	}
	if (self->saveExtensions != self->openExtensions) {
		for (unsigned int extensionIndex = 0; extensionIndex < self->saveExtensionCount; extensionIndex++) {
			free(self->saveExtensions[extensionIndex]);
		}
		free(self->saveExtensions);
	}
	free(self->fileName);
	free(self->directory);
	call_super_virtual(dispose, self);
}

bool DocumentFilesystemInterface_showOpenFileDialog(DocumentFilesystemInterface * self, const char * title, const char ** outFilePath) {
	struct ShellFileDialogFilter filter = {self->openTypeDescriptionString, self->openExtensionCount, (const char **) self->openExtensions};
	return Shell_openFileDialog(title, self->directory, self->fileName, outFilePath, 1, &filter);
}

bool DocumentFilesystemInterface_showOpenFileDialogMultiple(DocumentFilesystemInterface * self, const char * title, unsigned int * outFilePathCount, const char *** outFilePaths) {
	struct ShellFileDialogFilter filter = {self->openTypeDescriptionString, self->openExtensionCount, (const char **) self->openExtensions};
	return Shell_openFileDialogMultiple(title, self->directory, (self->directory != NULL && self->fileName != NULL) ? 1 : 0, (const char **) &self->fileName, outFilePathCount, outFilePaths, 1, &filter);
}

bool DocumentFilesystemInterface_showSaveFileDialog(DocumentFilesystemInterface * self, const char * title, const char ** outFilePath) {
	char defaultFileName[256];
	if (self->fileName == NULL) {
		snprintf_safe(defaultFileName, sizeof(defaultFileName), "untitled.%s", self->saveExtensions[self->preferredSaveExtensionIndex]);
	} else {
		snprintf_safe(defaultFileName, sizeof(defaultFileName), "%s.%s", getBaseName(self->fileName), self->saveExtensions[self->preferredSaveExtensionIndex]);
	}
	struct ShellFileDialogFilter filter = {self->saveTypeDescriptionString, self->saveExtensionCount, (const char **) self->saveExtensions};
	return Shell_saveFileDialog(title, self->directory, defaultFileName, outFilePath, 1, &filter);
}

void DocumentFilesystemInterface_setFileName(DocumentFilesystemInterface * self, const char * fileName) {
	free(self->fileName);
	self->fileName = strdup_nullSafe(fileName);
}

void DocumentFilesystemInterface_setDirectory(DocumentFilesystemInterface * self, const char * directory) {
	free(self->directory);
	self->directory = strdup_nullSafe(directory);
}

void DocumentFilesystemInterface_setFilePath(DocumentFilesystemInterface * self, const char * filePath) {
	free(self->fileName);
	free(self->directory);
	if (filePath == NULL) {
		self->fileName = NULL;
		self->directory = NULL;
	} else {
		self->fileName = strdup(getLastPathComponent(filePath));
		self->directory = strdup(getDirectory(filePath));
	}
}

const char * DocumentFilesystemInterface_getFilePath(DocumentFilesystemInterface * self) {
	if (self->directory == NULL || self->fileName == NULL) {
		return NULL;
	}
	size_t directoryLength = strlen(self->directory);
	size_t fileNameLength = strlen(self->fileName);
	char filePath[directoryLength + 1 + fileNameLength + 1];
	memcpy(filePath, self->directory, directoryLength);
	if (self->directory[directoryLength - 1] != '/'
#ifdef WIN32
	 && self->directory[directoryLength - 1] != '\\'
#endif
	) {
		filePath[directoryLength++] = '/';
	}
	memcpy(filePath + directoryLength, self->fileName, fileNameLength);
	filePath[directoryLength + fileNameLength] = 0;
	return AutoFreePool_add(strdup(filePath));
}

void DocumentFilesystemInterface_resetFile(DocumentFilesystemInterface * self) {
	free(self->fileName);
	self->fileName = NULL;
	self->fileExists = false;
}

void DocumentFilesystemInterface_fileOnDisk(DocumentFilesystemInterface * self, const char * filePath) {
	free(self->fileName);
	free(self->directory);
	self->fileName = strdup(getLastPathComponent(filePath));
	self->directory = strdup(getDirectory(filePath));
	self->fileExists = true;
}

void DocumentFilesystemInterface_setPreferredExtension(DocumentFilesystemInterface * self, const char * extension) {
	for (unsigned int extensionIndex = 0; extensionIndex < self->saveExtensionCount; extensionIndex++) {
		if (!strcmp(self->saveExtensions[extensionIndex], extension)) {
			self->preferredSaveExtensionIndex = extensionIndex;
			break;
		}
	}
}