/*
 * Copyright (C) 2011 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>

#include <linux/input.h>

#include "bootloader.h"
#include "common.h"
#include "extra-functions.h"
#include "data.h"
#include "variables.h"

void run_script(const char *str1, const char *str2, const char *str3, const char *str4, const char *str5, const char *str6, const char *str7, int request_confirm)
{
	ui_print("%s", str1);
	ui_print("%s", str2);
	pid_t pid = fork();
	if (pid == 0) {
		char *args[] = { "/sbin/sh", "-c", (char*)str3, "1>&2", NULL };
		execv("/sbin/sh", args);
		fprintf(stderr, str4, strerror(errno));
		_exit(-1);
	}
	int status;
	while (waitpid(pid, &status, WNOHANG) == 0) {
		ui_print(".");
		sleep(1);
	}
	ui_print("\n");
	if (!WIFEXITED(status) || (WEXITSTATUS(status) != 0)) {
		ui_print("%s", str5);
	} else {
		ui_print("%s", str6);
	}
}

void check_and_run_script(const char* script_file, const char* display_name)
{
	// Check for and run startup script if script exists
	struct stat st;
	if (stat(script_file, &st) == 0) {
		ui_print("Running %s script...\n", display_name);
		char command[255];
		strcpy(command, "chmod 755 ");
		strcat(command, script_file);
		system(command);
		system(script_file);
		ui_print("\nFinished running %s script.\n", display_name);
	}
}

int check_backup_name(int show_error) {
	// Check the backup name to ensure that it is the correct size and contains only valid characters
	// and that a backup with that name doesn't already exist
	char backup_name[MAX_BACKUP_NAME_LEN];
	char backup_loc[255], tw_image_dir[255];
	int copy_size = strlen(DataManager_GetStrValue(TW_BACKUP_NAME));
	int index, cur_char;
	struct stat st;

	// Check size
	if (copy_size > MAX_BACKUP_NAME_LEN) {
		if (show_error)
			LOGE("Backup name is too long.\n");
		return -2;
	}

	// Check characters
	strncpy(backup_name, DataManager_GetStrValue(TW_BACKUP_NAME), copy_size);
	if (strcmp(backup_name, "0") == 0)
		return 0; // A "0" (zero) means to use the current timestamp for the backup name
	for (index=0; index<copy_size; index++) {
		cur_char = (int)backup_name[index];
		if ((cur_char >= 48  && cur_char <= 57) || (cur_char >= 65 && cur_char <= 91) || cur_char == 93 || cur_char == 95 || (cur_char >= 97 && cur_char <= 123) || cur_char == 125 || cur_char == 45 || cur_char == 46) {
			// These are valid characters
			// Numbers
			// Upper case letters
			// Lower case letters
			// and -_.{}[]
		} else {
			if (show_error)
				LOGE("Backup name '%s' contains invalid character: '%c'\n", backup_name, (char)cur_char);
			return -3;
		}
	}

	// Check to make sure that a backup with this name doesn't already exist
	strcpy(backup_loc, DataManager_GetStrValue(TW_BACKUPS_FOLDER_VAR));
	sprintf(tw_image_dir,"%s/%s/.", backup_loc, backup_name);
    if (stat(tw_image_dir, &st) == 0) {
		if (show_error)
			LOGE("A backup with this name already exists.\n");
		return -4;
	}

	// No problems found, return 0
	return 0;
}

static const char *COMMAND_FILE = "/cache/recovery/command";
static const char *INTENT_FILE = "/cache/recovery/intent";
static const char *LOG_FILE = "/cache/recovery/log";
static const char *LAST_LOG_FILE = "/cache/recovery/last_log";
static const char *LAST_INSTALL_FILE = "/cache/recovery/last_install";
static const char *CACHE_ROOT = "/cache";
static const char *SDCARD_ROOT = "/sdcard";
static const char *TEMPORARY_LOG_FILE = "/tmp/recovery.log";
static const char *TEMPORARY_INSTALL_FILE = "/tmp/last_install";

// close a file, log an error if the error indicator is set
static void check_and_fclose(FILE *fp, const char *name) {
    fflush(fp);
    if (ferror(fp)) LOGE("Error in %s\n(%s)\n", name, strerror(errno));
    fclose(fp);
}

static void copy_log_file(const char* source, const char* destination, int append) {
    FILE *log = fopen_path(destination, append ? "a" : "w");
    if (log == NULL) {
        LOGE("Can't open %s\n", destination);
    } else {
        FILE *tmplog = fopen(source, "r");
        if (tmplog != NULL) {
            if (append) {
                fseek(tmplog, tmplog_offset, SEEK_SET);  // Since last write
            }
            char buf[4096];
            while (fgets(buf, sizeof(buf), tmplog)) fputs(buf, log);
            if (append) {
                tmplog_offset = ftell(tmplog);
            }
            check_and_fclose(tmplog, source);
        }
        check_and_fclose(log, destination);
    }
}

// clear the recovery command and prepare to boot a (hopefully working) system,
// copy our log file to cache as well (for the system to read), and
// record any intent we were asked to communicate back to the system.
// this function is idempotent: call it as many times as you like.
void twfinish_recovery(const char *send_intent) {
    // By this point, we're ready to return to the main system...
    if (send_intent != NULL) {
        FILE *fp = fopen_path(INTENT_FILE, "w");
        if (fp == NULL) {
            LOGE("Can't open %s\n", INTENT_FILE);
        } else {
            fputs(send_intent, fp);
            check_and_fclose(fp, INTENT_FILE);
        }
    }

    // Copy logs to cache so the system can find out what happened.
    copy_log_file(TEMPORARY_LOG_FILE, LOG_FILE, true);
    copy_log_file(TEMPORARY_LOG_FILE, LAST_LOG_FILE, false);
    copy_log_file(TEMPORARY_INSTALL_FILE, LAST_INSTALL_FILE, false);
    chmod(LOG_FILE, 0600);
    chown(LOG_FILE, 1000, 1000);   // system user
    chmod(LAST_LOG_FILE, 0640);
    chmod(LAST_INSTALL_FILE, 0644);

    // Reset to normal system boot so recovery won't cycle indefinitely.
    struct bootloader_message boot;
    memset(&boot, 0, sizeof(boot));
    set_bootloader_message(&boot);

    // Remove the command file, so recovery won't repeat indefinitely.
    if (system("mount /cache") != 0 ||
        (unlink(COMMAND_FILE) && errno != ENOENT)) {
        LOGW("Can't unlink %s\n", COMMAND_FILE);
    }

    system("umount /cache");
    sync();  // For good measure.
}