/*
   +----------------------------------------------------------------------+
   | PHP Version 5                                                        |
   +----------------------------------------------------------------------+
   | Copyright (c) 1997-2013 The PHP Group                                |
   +----------------------------------------------------------------------+
   | This source file is subject to version 3.01 of the PHP license,      |
   | that is bundled with this package in the file LICENSE, and is        |
   | available through the world-wide-web at the following url:           |
   | http://www.php.net/license/3_01.txt                                  |
   | If you did not receive a copy of the PHP license and are unable to   |
   | obtain it through the world-wide-web, please send a note to          |
   | license@php.net so we can mail you a copy immediately.               |
   +----------------------------------------------------------------------+
   | Authors: Felipe Pena <felipe@php.net>                                |
   | Authors: Joe Watkins <joe.watkins@live.co.uk>                        |
   +----------------------------------------------------------------------+
*/

#include "phpdbg.h"
#include "phpdbg_cmd.h"
#include "phpdbg_utils.h"

ZEND_EXTERN_MODULE_GLOBALS(phpdbg);

const char *phpdbg_get_param_type(const phpdbg_param_t *param TSRMLS_DC) /* {{{ */
{
	switch (param->type) {
		case EMPTY_PARAM:
			return "empty";
		case ADDR_PARAM:
			return "address";
		case NUMERIC_PARAM:
			return "numeric";
		case METHOD_PARAM:
			return "method";
		case FILE_PARAM:
			return "file";
		case STR_PARAM:
			return "string";
		default: /* this is bad */
			return "unknown";
    }
}

phpdbg_param_type phpdbg_parse_param(const char *str, size_t len, phpdbg_param_t *param TSRMLS_DC) /* {{{ */
{
	char *class_name, *func_name;

	if (len == 0) {
		param->type = EMPTY_PARAM;
		goto parsed;
	}

	if (phpdbg_is_addr(str)) {

		param->addr = strtoul(str, 0, 16);
		param->type = ADDR_PARAM;
		goto parsed;

	} else if (phpdbg_is_numeric(str)) {

		param->num = strtol(str, NULL, 0);
		param->type = NUMERIC_PARAM;
        goto parsed;

	} else if (phpdbg_is_class_method(str, len+1, &class_name, &func_name)) {

		param->method.class = class_name;
		param->method.name = func_name;
		param->type = METHOD_PARAM;
		goto parsed;

	} else {
		const char *line_pos = strchr(str, ':');

		if (line_pos && phpdbg_is_numeric(line_pos+1)) {
			char path[MAXPATHLEN];

			memcpy(path, str, line_pos - str);
			path[line_pos - str] = 0;

			param->file.name = phpdbg_resolve_path(path TSRMLS_CC);
			param->file.line = strtol(line_pos+1, NULL, 0);
			param->type = FILE_PARAM;
			goto parsed;
		}
	}

	param->str = estrndup(str, len);
	param->len = len;
	param->type = STR_PARAM;

parsed:
    phpdbg_debug("phpdbg_parse_param(\"%s\", %lu): %s",
		str, len, phpdbg_get_param_type(param TSRMLS_CC));
	return param->type;
} /* }}} */

void phpdbg_clear_param(phpdbg_param_t *param TSRMLS_DC) /* {{{ */
{
	if (param) {
		switch (param->type) {
			case FILE_PARAM:
				efree(param->file.name);
				break;
			case METHOD_PARAM:
				efree(param->method.class);
				efree(param->method.name);
				break;
			case STR_PARAM:
				efree(param->str);
				break;
			default:
				break;
		}
	}
	
} /* }}} */

phpdbg_input_t* phpdbg_read_input(TSRMLS_D) /* {{{ */
{
	if (!(PHPDBG_G(flags) & PHPDBG_IS_QUITTING)) {
		phpdbg_input_t *buffer = NULL;
		size_t cmd_len = 0L;

#ifndef HAVE_LIBREADLINE
		char *cmd = NULL;
		char buf[PHPDBG_MAX_CMD];		
		if (!phpdbg_write(PROMPT) ||
			!fgets(buf, PHPDBG_MAX_CMD, stdin)) {
			return NULL;
		}
		
		cmd = buf;
#else
		char *cmd = readline(PROMPT);
		if (!cmd) {
			return NULL;
		}

		add_history(cmd);
#endif

		/* strip whitespace */
		while (cmd && isspace(*cmd))
			cmd++;
		cmd_len = strlen(cmd);
		while (*cmd && isspace(cmd[cmd_len-1]))
			cmd_len--;
		cmd[cmd_len] = '\0';
		
		/* allocate and sanitize buffer */
		buffer = (phpdbg_input_t*) emalloc(sizeof(phpdbg_input_t));
		if (buffer) {
			buffer->length = strlen(cmd);
			buffer->string = emalloc(buffer->length+1);
			if (buffer->string) {
				memcpy(
					buffer->string, cmd, buffer->length);
				buffer->string[buffer->length] = '\0';
				/* store constant pointer to start of buffer */
				buffer->start = (char* const*) buffer->string;
			}
		}

#ifdef HAVE_LIBREADLINE
		if (cmd) {
			free(cmd);
		}
#endif

		return buffer;
	}
	
	return NULL;
} /* }}} */

int phpdbg_do_cmd(const phpdbg_command_t *command, char *cmd_line, size_t cmd_len TSRMLS_DC) /* {{{ */
{
	int rc = FAILURE;
	char *expr = NULL;
#ifndef _WIN32
	const char *cmd = strtok_r(cmd_line, " ", &expr);
#else
	const char *cmd = strtok_s(cmd_line, " ", &expr);
#endif
	size_t expr_len = (cmd != NULL) ? strlen(cmd) : 0;

	while (command && command->name && command->handler) {
		if ((command->name_len == expr_len && memcmp(cmd, command->name, expr_len) == 0)
			|| (expr_len == 1 && command->alias && command->alias == cmd_line[0])) {
			phpdbg_param_t param = {0};

			phpdbg_parse_param(
				expr,
				(cmd_len - expr_len) ? (((cmd_len - expr_len) - sizeof(" "))+1) : 0,
				&param TSRMLS_CC);

			if (command->subs && param.type == STR_PARAM) {
				if (phpdbg_do_cmd(command->subs, param.str, param.len TSRMLS_CC) == SUCCESS) {
					rc = SUCCESS;
					goto done;
				}
			}

			if (command->arg_type == REQUIRED_ARG && param.type == EMPTY_PARAM) {
				phpdbg_error("This command requires argument!");
				rc = FAILURE;
			} else if (command->arg_type == NO_ARG && param.type != EMPTY_PARAM) {
				phpdbg_error("This command does not expect argument!");
				rc = FAILURE;
			} else {
				rc = command->handler(
					&param TSRMLS_CC);
				
				PHPDBG_G(lcmd) = (phpdbg_command_t*) command;
				PHPDBG_G(lparam) = param;
			}
			break;
		}
		++command;
	}

done:
	return rc;
} /* }}} */