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#include <asm-generic/errno-base.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sqlite3.h>
#include <sys/stat.h>
#include <unistd.h>
#include "config.h"
#include "db.h"
/* return values:
0 -> success
1 -> failure
*/
int create_tables(const char *path);
// callback function prototypes
int group_count_callback(void *first_arg, int argc, char **argv, char **azColName);
int entry_count_callback(void *first_arg, int argc, char **argv, char **azColName);
int load_groups_callback(void *first_arg, int argc, char **argv, char **azColName);
int load_entries_callback(void *first_arg, int argc, char **argv, char **azColName);
// globals
static int callback_index; // keep track of index when filling arrays using callback functions
int db_init() {
int res;
char db_path[BUF_LEN];
// create USER_DATA_DIR if not exists
res = mkdir(USER_DATA_DIR, S_IRWXU);
//if(res != 0 && res != EEXIST) return 1; // TODO write a better check incase mkdir fails
// return if db already exists
res = access(USER_DATA_PATH, F_OK);
if(res == 0) return 0;
// create database with tables
res = create_tables(USER_DATA_PATH);
if(res != 0) return 2;
return 0;
}
Group *db_load_groups(int *group_count) {
Group *output;
sqlite3 *db;
const char *count_query = "SELECT COUNT(*) FROM 'Group'";
const char *query = "SELECT ROWID, * FROM 'Group'";
char *zErrMsg = NULL; // hold error from sqlite3_exec
int res;
res = sqlite3_open(USER_DATA_PATH, &db);
if(res) {
fprintf(stderr, "Can't open database: %s\n", sqlite3_errmsg(db));
sqlite3_close(db);
return NULL;
}
// count rows in table
res = sqlite3_exec(db, count_query, group_count_callback, &output, &zErrMsg);
if(res != SQLITE_OK) {
fprintf(stderr, "SQL error: %s\n", zErrMsg);
sqlite3_free(zErrMsg);
return NULL;
}
// do select query
callback_index = 0;
res = sqlite3_exec(db, query, load_groups_callback, &output, &zErrMsg);
if(res != SQLITE_OK) {
fprintf(stderr, "SQL error: %s\n", zErrMsg);
sqlite3_free(zErrMsg);
return NULL;
}
*group_count = callback_index;
sqlite3_close(db);
return output;
}
Entry *db_load_entries(int *entry_count) {
Entry *output;
sqlite3 *db;
const char *count_query = "SELECT COUNT(*) FROM 'Entry'";
const char *query = "SELECT ROWID, * FROM 'Entry'";
char *zErrMsg = NULL; // hold error from sqlite3_exec
int res;
res = sqlite3_open(USER_DATA_PATH, &db);
if(res) {
fprintf(stderr, "Can't open database: %s\n", sqlite3_errmsg(db));
sqlite3_close(db);
return NULL;
}
// count rows in table
res = sqlite3_exec(db, count_query, entry_count_callback, &output, &zErrMsg);
if(res != SQLITE_OK) {
fprintf(stderr, "SQL error: %s\n", zErrMsg);
sqlite3_free(zErrMsg);
return NULL;
}
// do select query
callback_index = 0;
res = sqlite3_exec(db, query, load_entries_callback, &output, &zErrMsg);
if(res != SQLITE_OK) {
fprintf(stderr, "SQL error: %s\n", zErrMsg);
sqlite3_free(zErrMsg);
return NULL;
}
*entry_count = callback_index;
sqlite3_close(db);
return output;
}
int create_tables(const char *path) {
sqlite3 *db;
char queries[2][BUF_LEN];
int num_queries = 2;
char *zErrMsg = NULL; // hold error from sqlite3_exec
int res;
int i;
// Group table - stores groups of entries
// note: in sqlite, use rowid, don't create id column
sprintf(queries[0],
"CREATE TABLE IF NOT EXISTS 'Group' ("
"'Name' varchar(%d) NOT NULL, "
"'Desc' varchar(%d) DEFAULT NULL, "
"'Url' varchar(%d) DEFAULT NULL);",
BUF_LEN, BUF_LEN, BUF_LEN);
// Entry table - stores individual entries
sprintf(queries[1],
"CREATE TABLE IF NOT EXISTS 'Entry' ("
"'Group_ID' int NOT NULL, " // FIXME might want foreign key constraint
"'Due_date' date DEFAULT NULL, "
"'Alt_due_date' varchar(%d) DEFAULT NULL, "
"'Title' varchar(%d) NOT NULL, "
"'Color' varchar(%d) DEFAULT NULL, "
"'Highlight' varchar(%d) DEFAULT NULL, "
"'Done' boolean DEFAULT NULL, "
"'Url' varchar(%d) DEFAULT NULL);",
BUF_LEN, BUF_LEN, BUF_LEN, BUF_LEN, BUF_LEN);
// open the database and run each query
res = sqlite3_open(path, &db);
if(res) {
fprintf(stderr, "Can't open database: %s\n", sqlite3_errmsg(db));
sqlite3_close(db);
return 1;
}
for(i = 0; i < num_queries; ++i) {
res = sqlite3_exec(db, queries[i], NULL, NULL, &zErrMsg);
if(res != SQLITE_OK) {
fprintf(stderr, "SQL error: %s\n", zErrMsg);
sqlite3_free(zErrMsg);
}
}
// wrap-up
sqlite3_close(db);
return 0;
}
// callback functions
int group_count_callback(void *first_arg, int argc, char **argv, char **azColName) {
Group **groups = (Group **) first_arg;
*groups = calloc(atoi(argv[0]), sizeof(Group));
return 0;
}
int entry_count_callback(void *first_arg, int argc, char **argv, char **azColName) {
Entry **entries = (Entry **) first_arg;
*entries = calloc(atoi(argv[0]), sizeof(Entry));
return 0;
}
int load_groups_callback(void *first_arg, int argc, char **argv, char **azColName) {
Group **groups = (Group **) first_arg;
// check that enough arguments were passed
if(argc < 4) {
fprintf(stderr, "Error: not enough rows returned in 'Group' table\n");
return 1;
}
group_set_id(&((*groups)[callback_index]), (argv[0] ? atoi(argv[0]) : 0));
group_set_name(&((*groups)[callback_index]), (argv[1] ? argv[1] : ""));
group_set_desc(&((*groups)[callback_index]), (argv[2] ? argv[2] : ""));
group_set_url(&((*groups)[callback_index]), (argv[3] ? argv[3] : ""));
++callback_index;
return 0;
}
int load_entries_callback(void *first_arg, int argc, char **argv, char **azColName) {
Entry **entries = (Entry **) first_arg;
struct tm due_date = {0};
// check that enough arguments were passed
if(argc < 8) {
fprintf(stderr, "Error: not enough rows returned in 'Entry' table\n");
return 1;
}
entry_set_id(&((*entries)[callback_index]), (argv[0] ? atoi(argv[0]) : 0));
entry_set_group_id(&((*entries)[callback_index]), (argv[1] ? atoi(argv[1]) : 0));
if(argv[2] && strlen(argv[2])) {
strptime(argv[2], "%F", &due_date);
printf("DEBUG: %s\n", argv[2]);
printf("DEBUG: %d\n", due_date.tm_year);
entry_set_due_date(&((*entries)[callback_index]), &due_date);
}
else entry_set_due_date(&((*entries)[callback_index]), NULL);
entry_set_alt_due_date(&((*entries)[callback_index]), (argv[3] ? argv[3] : ""));
entry_set_title(&((*entries)[callback_index]), (argv[4] ? argv[4] : ""));
entry_set_color(&((*entries)[callback_index]), (argv[5] ? argv[5] : ""));
entry_set_highlight(&((*entries)[callback_index]), (argv[6] ? argv[6] : ""));
entry_set_done(&((*entries)[callback_index]), (argv[7] ? argv[7] : false));
entry_set_url(&((*entries)[callback_index]), (argv[8] ? argv[8] : ""));
++callback_index;
return 0;
}
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