#pragma once
#include <bvr.h>
#include <stdio.h>
#include <stdlib.h>
#include <dirent.h>
#include <string.h>
#include <mkdirp.c>
#include <fopenmkdir.c>
#include <limits.h>
#include <randstring.c>
#include <bvrcommands.c>
#include <bvrvar.c>
int bvr_command_processor(FILE * page_source_file, FILE * temp_output_file) {
	char copy_buffer[COPY_BUFFER_SIZE];
	copy_buffer[(ftell(page_source_file))% COPY_BUFFER_SIZE] = fgetc(page_source_file);
	char command_entered = copy_buffer[(ftell(page_source_file))% COPY_BUFFER_SIZE];
	int command_handler_output = SUCCESS;;
	// argument_feed = fmemopen (argument_string, strlen (argument_string), "r");
	switch (command_entered) { // switch command
		case 'g': /* et */
			command_handler_output = bvr_handle_get(page_source_file, temp_output_file);
			break;
		case 's': /* et */
			command_handler_output = bvr_handle_set(page_source_file, temp_output_file);
			break;
		case 'i': /* nclude */
			command_handler_output = bvr_handle_include(page_source_file, temp_output_file);
			break;
		case 'm': /* ove */
			command_handler_output = bvr_handle_move(page_source_file, temp_output_file);
			break;
		case 'f': /* i_ */
			command_handler_output = bvr_handle_if(page_source_file, temp_output_file);
			break;
		case '=': /*  */
			command_handler_output = bvr_handle_equals(page_source_file, temp_output_file);
			break;
		case '"': /*  */
			command_handler_output = bvr_handle_string(page_source_file, temp_output_file);
			break;
		case 'u': /* s_bstring*/
			command_handler_output = bvr_handle_substring(page_source_file, temp_output_file);
			break;
		case 'w': /* hile */
			command_handler_output = bvr_handle_while(page_source_file, temp_output_file);
			break;
		case 'e': /* xplode */
			command_handler_output = bvr_handle_explode(page_source_file, temp_output_file);
			break;
		case 'r': /* ačunanje */
			command_handler_output = bvr_handle_math(page_source_file, temp_output_file);
			break;
		case 'j': /* oin */
			command_handler_output = bvr_handle_join(page_source_file, temp_output_file);
			break;
		case 'b': /* unden */
			// fprintf(stderr, "bunden %c\n", command_entered);
			command_handler_output = bvr_handle_info(page_source_file, temp_output_file);
			break;
		default:
			fprintf(stderr, "[tape.c] bvr_command_processor: unknown command %c (dec: %d)\n", command_entered, command_entered);
			fprintf(temp_output_file, "\nbVerbose unknown command %c\n", command_entered);
	}
	if(command_handler_output != SUCCESS) {
		fprintf(stderr, "[tape.c] bvr_inline_command_processor: command handler for %c returned an error code.\n", command_entered);
		fprintf(temp_output_file,  "\nbVerbose command handler for %c returned an error code.\n", command_entered);
		return FAILURE;
	}
	return SUCCESS;

}
int bvr_inline_command_processor(FILE * page_source_file, FILE * output_file, char copy_buffer[]) {
	FILE * temp_output_file = output_file;
	int what_to_return = SUCCESS;
	// for(int i = 1; i <= OPENING_COMMAND_TAG_LENGTH; i++) {
	// 	copy_buffer[ftell(page_source_file)% COPY_BUFFER_SIZE] = fgetc(page_source_file); // remove opening command tag characters
	// }
	int command_processor_status = WAITING_FOR_COMMAND;
	// int argument_length = 0;
	char command_entered;
	while(copy_buffer[(ftell(page_source_file)-1)% COPY_BUFFER_SIZE] != CLOSING_COMMAND_TAG_CHAR_1 ||
			copy_buffer[ftell(page_source_file)% COPY_BUFFER_SIZE] != CLOSING_COMMAND_TAG_CHAR_2 ||
			command_processor_status == PROCESSING_COMMAND) {
		copy_buffer[(ftell(page_source_file))% COPY_BUFFER_SIZE] = fgetc(page_source_file);
		if(copy_buffer[(ftell(page_source_file))% COPY_BUFFER_SIZE] == LINE_COMMENT_CHAR && command_processor_status == WAITING_FOR_COMMAND) {
			temp_output_file = fopen(THE_VOID, "w");
			continue;
		}
		if(copy_buffer[(ftell(page_source_file))% COPY_BUFFER_SIZE] == LINE_COMMAND_CHAR && command_processor_status == WAITING_FOR_COMMAND) {
			// command_entered = copy_buffer[(ftell(page_source_file)-1)% COPY_BUFFER_SIZE];
			if(bvr_command_processor(page_source_file, output_file) != SUCCESS) {
				fprintf(temp_output_file, "\nbVerbose command processor error.\n");
				fprintf(stderr, "[tape.c] bvr_inline_command_processor: bvr_command_processor returned a non-success status.\n");
			}
			copy_buffer[ftell(page_source_file)% COPY_BUFFER_SIZE] = '@'; // ker če command handler "poje" @ ne bomo izšli iz while. Nič pa ne
		}																																// moti ena dodatna @ v bufferju (hello, future self)

		if(copy_buffer[(ftell(page_source_file)-1)% COPY_BUFFER_SIZE] == EOF) {
			fprintf(temp_output_file, "\nbVerbose syntax error: EOF reached before closing command tag --- stopped with this bvr file\n");
			fprintf(stderr, "[tape.c] bvr_inline_command_processor: syntax error: EOF reached before @> --- stopped with this bvr file\n");
			return FAILURE;
		}
	}
	/* start collect garbage on success */
	bvr_var_remove_orphans();
	/* end collect garbage on success */
	// copy_buffer[(ftell(page_source_file)% COPY_BUFFER_SIZE)] = fgetc(page_source_file); // remove closing command tag character
	return what_to_return;
}

int init_tape_copy_buffer(char copy_buffer[], int buffer_size) {
	for(int i = 0; i <buffer_size; i++) { // da garbage vrednosti ne bodo slučajno ukazi!
		(copy_buffer)[i] = '\n'; // čeprav OS verjetno nastavi ram na \0\0\0\0\0\0 preden ga da procesu
	} // ampak kaj pa, ko funkcijo zaženemo drugič, pointer bo kazal na isto mesto! // nočemo \0
}

int bvr_compose_stream(FILE * page_source_file, FILE * temp_output_file) {
	int cycles = 0;
	char copy_buffer[COPY_BUFFER_SIZE];
	init_tape_copy_buffer(copy_buffer, COPY_BUFFER_SIZE);
 	// copy_buffer[ftell(page_source_file)% COPY_BUFFER_SIZE] = fgetc(page_source_file);
	// if(copy_buffer[ftell(page_source_file)% COPY_BUFFER_SIZE] == EOF) {
	// 	goto done_reading_write_file;
	// }
  while (1) {
  	copy_buffer[ftell(page_source_file)% COPY_BUFFER_SIZE] = fgetc(page_source_file);
		if(copy_buffer[(ftell(page_source_file)-1)% COPY_BUFFER_SIZE] == OPENING_COMMAND_TAG_CHAR_1 &&
				copy_buffer[ftell(page_source_file)% COPY_BUFFER_SIZE] == OPENING_COMMAND_TAG_CHAR_2) {
		 	if(bvr_inline_command_processor(page_source_file, temp_output_file, copy_buffer) == FAILURE) {
		 		fprintf(temp_output_file, "\nbvr_inline_command_processor returned an error status.\n");
				fprintf(stderr, "[tape.c] bvr_inline_command_processor returned an error status.\n");
		 	}
		  copy_buffer[ftell(page_source_file)% COPY_BUFFER_SIZE] = fgetc(page_source_file); // remove last > that just wants to be there... OB1
			continue;
		}
		if(copy_buffer[(ftell(page_source_file)-1)% COPY_BUFFER_SIZE] == '\n' && copy_buffer[ftell(page_source_file)% COPY_BUFFER_SIZE] == LINE_COMMENT_CHAR) {
			// copy_buffer[ftell(page_source_file)% COPY_BUFFER_SIZE] = fgetc(page_source_file); // idk, OB1 is a bitch
			while(copy_buffer[(ftell(page_source_file)-0)% COPY_BUFFER_SIZE] != '\n') { // idk, OB1 is a bitch
 				copy_buffer[ftell(page_source_file)% COPY_BUFFER_SIZE] = fgetc(page_source_file); // idk, OB1 is a bitch
			}
			continue;
		}
		// if(copy_buffer[(ftell(page_source_file)-1)% COPY_BUFFER_SIZE] == '\n' && copy_buffer[ftell(page_source_file)% COPY_BUFFER_SIZE] == LINE_COMMAND_CHAR) {
		// 	if(bvr_command_processor(page_source_file, temp_output_file, copy_buffer) == FAILURE) {
		//  		fprintf(temp_output_file, "\nbvr_command_processor returned an error status whilst composing %s\n", page_source_file_path);
		// 		fprintf(stderr, "[tape.c] bvr_command_processor returned an error status whilst composing %s\n", page_source_file_path);
		// 	}
		// 	continue;
		// }
		if(copy_buffer[ftell(page_source_file)% COPY_BUFFER_SIZE] == EOF) {
			fputc(' ', temp_output_file); // NO POMEGRANTES! NO! NO! NO! NO POMEGRANTES!
			break;
		}
		if (cycles++ != 0) { // da ne napišemo prvega znaka bufferja, preden je sploh kaj v bufferju.
			fputc(copy_buffer[(ftell(page_source_file)-1)% COPY_BUFFER_SIZE], temp_output_file);
		}
  }
	return SUCCESS;
}

int bvr_compose_page(char page_source_file_path[], int this_is_a_top_level_page, char * temp_output_path) {
	if(temp_output_path != NULL) {
		char * temp_output_filename = randstring(16);
		char temp_output_path[80] = "tmp/";
		strcat(temp_output_path, temp_output_filename);
	}
	FILE * temp_output_file = fopen_mkdir(temp_output_path, "w");
	FILE * page_source_file = fopen(page_source_file_path, "r");
	if(bvr_compose_stream(page_source_file, temp_output_file) != SUCCESS) {
		fprintf(stderr, "[tape.c] bvr_compose_page: bvr_compose_stream returned a non-successful response whilst composing %s. Nevertheless, we are continuing.\n",
			page_source_file_path);
	}


	done_reading_write_file:
	if(this_is_a_top_level_page) {
		char folder_of_file[PATH_MAX];
		strlcpy(folder_of_file, page_source_file_path, PATH_MAX);
		char * p;
		p = strrchr(folder_of_file, '/');
		if (!p) {
			printf("[fopenmkdir.c] filename contains no slash.\n");
			return FAILURE;
		} else {
			*p = '\0';
		}
		char *type_of_page = strrchr(folder_of_file, '/');
		if (type_of_page == NULL) {
  		printf("[tape.c] bvr_compose_page: folder of file contains no slash, hope %s is a page category.", folder_of_file);
			type_of_page = folder_of_file;
		} else {
			type_of_page++;
		}
		// type_of_page+1 is a page category (skip delimeter pointer.)
	}
	return SUCCESS;
}