382 lines
12 KiB
Go
382 lines
12 KiB
Go
package db
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/*
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Stores the database functions related to tasks like
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GetTaskByID(id int)
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GetTasks(status string)
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DeleteAll()
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*/
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import (
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"database/sql"
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"log"
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"strings"
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"time"
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_ "github.com/mattn/go-sqlite3" //we want to use sqlite natively
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md "github.com/shurcooL/github_flavored_markdown"
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"github.com/thewhitetulip/Tasks/types"
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)
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var database Database
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var taskStatus map[string]int
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var err error
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//Database encapsulates database
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type Database struct {
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db *sql.DB
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}
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//Begins a transaction
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func (db Database) begin() (tx *sql.Tx) {
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tx, err := db.db.Begin()
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if err != nil {
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log.Println(err)
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return nil
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}
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return tx
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}
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func (db Database) prepare(q string) (stmt *sql.Stmt) {
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stmt, err := db.db.Prepare(q)
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if err != nil {
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log.Println(err)
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return nil
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}
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return stmt
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}
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func (db Database) query(q string, args ...interface{}) (rows *sql.Rows) {
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rows, err := db.db.Query(q, args...)
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if err != nil {
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log.Println(err)
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return nil
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}
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return rows
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}
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func init() {
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database.db, err = sql.Open("sqlite3", "./tasks.db")
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taskStatus = map[string]int{"COMPLETE": 1, "PENDING": 2, "DELETED": 3}
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if err != nil {
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log.Fatal(err)
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}
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}
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//Close function closes this database connection
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func Close() {
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database.db.Close()
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}
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//GetTasks retrieves all the tasks depending on the
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//status pending or trashed or completed
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func GetTasks(username, status, category string) (types.Context, error) {
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log.Println("getting tasks for ", status)
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var tasks []types.Task
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var task types.Task
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var TaskCreated time.Time
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var context types.Context
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var getTaskSQL string
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var rows *sql.Rows
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comments, err := GetComments(username)
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if err != nil {
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return context, err
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}
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basicSQL := "select t.id, title, content, created_date, priority, case when c.name is null then 'NA' else c.name end from task t, status s, user u left outer join category c on c.id=t.cat_id where u.username=? and s.id=t.task_status_id and u.id=t.user_id "
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if category == "" {
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switch status {
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case "pending":
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getTaskSQL = basicSQL + " and s.status='PENDING' and t.hide!=1"
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case "deleted":
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getTaskSQL = basicSQL + " and s.status='DELETED' and t.hide!=1"
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case "completed":
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getTaskSQL = basicSQL + " and s.status='COMPLETE' and t.hide!=1"
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}
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getTaskSQL += " order by t.created_date asc"
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rows = database.query(getTaskSQL, username, username)
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} else {
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status = category
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//This is a special case for showing tasks with null categories, we do a union query
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if category == "UNCATEGORIZED" {
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getTaskSQL = "select t.id, title, content, created_date, priority, 'UNCATEGORIZED' from task t, status s, user u where u.username=? and s.id=t.task_status_id and u.id=t.user_id and t.cat_id=0 and s.status='PENDING' order by priority desc, created_date asc, finish_date asc"
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rows, err = database.db.Query(getTaskSQL, username)
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} else {
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getTaskSQL = basicSQL + " and name = ? and s.status='PENDING' order by priority desc, created_date asc, finish_date asc"
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rows, err = database.db.Query(getTaskSQL, username, category)
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}
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if err != nil {
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log.Println("tasks.go: something went wrong while getting query fetch tasks by category")
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}
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}
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defer rows.Close()
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for rows.Next() {
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task = types.Task{}
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err = rows.Scan(&task.Id, &task.Title, &task.Content, &TaskCreated, &task.Priority, &task.Category)
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task.Content = string(md.Markdown([]byte(task.Content)))
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// TaskContent = strings.Replace(TaskContent, "\n", "<br>", -1)
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if err != nil {
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log.Println(err)
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}
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if comments[task.Id] != nil {
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task.Comments = comments[task.Id]
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}
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TaskCreated = TaskCreated.Local()
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// if task.Priority != "1" { // if priority is not 1 then calculate, else why bother?
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// CurrentTime := time.Now().Local()
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// diff := CurrentTime.Sub(TaskCreated).Hours()
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// if diff > 168 {
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// task.IsOverdue = true // If one week then overdue by default
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// }
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// }
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task.Created = TaskCreated.Format("Jan 2 2006")
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tasks = append(tasks, task)
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}
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context = types.Context{Tasks: tasks, Navigation: status}
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return context, nil
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}
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//GetTaskByID function gets the tasks from the ID passed to the function, used to populate EditTask
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func GetTaskByID(username string, id int) (types.Context, error) {
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var tasks []types.Task
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var task types.Task
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getTaskSQL := "select t.id, t.title, t.content, t.priority, t.hide, 'UNCATEGORIZED' from task t join user u where t.user_id=u.id and t.cat_id=0 union select t.id, t.title, t.content, t.priority, c.name from task t join user u left outer join category c where c.id = t.cat_id and t.user_id=u.id and t.id=? and u.username=?;"
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rows := database.query(getTaskSQL, id, username)
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defer rows.Close()
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if rows.Next() {
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err := rows.Scan(&task.Id, &task.Title, &task.Content, &task.Priority, &task.IsHidden, &task.Category)
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if err != nil {
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log.Println(err)
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//send email to respective people
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}
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}
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tasks = append(tasks, task)
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context := types.Context{Tasks: tasks, Navigation: "edit"}
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return context, nil
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}
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//TrashTask is used to delete the task
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func TrashTask(username string, id int) error {
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err := taskQuery("update task set task_status_id=?,last_modified_at=datetime() where user_id=(select id from user where username=?) and id=?", taskStatus["DELETED"], username, id)
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return err
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}
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//CompleteTask is used to mark tasks as complete
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func CompleteTask(username string, id int) error {
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err := taskQuery("update task set task_status_id=?, finish_date=datetime(),last_modified_at=datetime() where id=? and user_id=(select id from user where username=?) ", taskStatus["COMPLETE"], id, username)
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return err
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}
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//DeleteAll is used to empty the trash
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func DeleteAll(username string) error {
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err := taskQuery("delete from task where task_status_id=? where user_id=(select id from user where username=?)", taskStatus["DELETED"], username)
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return err
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}
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//RestoreTask is used to restore tasks from the Trash
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func RestoreTask(username string, id int) error {
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err := taskQuery("update task set task_status_id=?,last_modified_at=datetime(),finish_date=null where id=? and user_id=(select id from user where username=?)", taskStatus["PENDING"], id, username)
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return err
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}
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//RestoreTaskFromComplete is used to restore tasks from the Trash
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func RestoreTaskFromComplete(username string, id int) error {
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err := taskQuery("update task set finish_date=null,last_modified_at=datetime(), task_status_id=? where id=? and user_id=(select id from user where username=?)", taskStatus["PENDING"], id, username)
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return err
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}
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//DeleteTask is used to delete the task from the database
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func DeleteTask(username string, id int) error {
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err := taskQuery("delete from task where id = ? and user_id=(select id from user where username=?)", id, username)
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return err
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}
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//AddTask is used to add the task in the database
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//TODO: add dueDate feature later
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func AddTask(title, content, category string, taskPriority int, username string, hidden int) error {
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log.Println("AddTask: started function")
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var err error
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// var timeDueDate time.Time
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// if dueDate != "" {
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// timeDueDate, err = time.Parse("31/12/2016", dueDate)
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// if err != nil {
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// log.Fatal(err)
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// }
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// }
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userID, err := GetUserID(username)
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if err != nil && (title != "" || content != "") {
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return err
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}
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if category == "" {
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err = taskQuery("insert into task(title, content, priority, task_status_id, created_date, last_modified_at, user_id,hide) values(?,?,?,?,datetime(), datetime(),?,?)", title, content, taskPriority, taskStatus["PENDING"], userID, hidden)
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} else {
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categoryID := GetCategoryByName(username, category)
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err = taskQuery("insert into task(title, content, priority, created_date, last_modified_at, cat_id, task_status_id, user_id,hide) values(?,?,?,datetime(), datetime(), ?,?,?,?)", title, content, taskPriority, categoryID, taskStatus["PENDING"], userID, hidden)
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}
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return err
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}
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//GetCategoryIDByName will return the category ID for the category, used in the edit task
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//function where we need to be able to update the categoryID of the task
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func GetCategoryIDByName(username string, category string) int {
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var categoryID int
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getTaskSQL := "select c.id from category c , user u where u.id = c.user_id and name=? and u.username=?"
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rows := database.query(getTaskSQL, category, username)
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defer rows.Close()
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if rows.Next() {
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err := rows.Scan(&categoryID)
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if err != nil {
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log.Println(err)
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//send email to respective people
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}
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}
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return categoryID
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}
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//UpdateTask is used to update the tasks in the database
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func UpdateTask(id int, title, content, category string, priority int, username string) error {
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categoryID := GetCategoryIDByName(username, category)
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userID, err := GetUserID(username)
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if err != nil {
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return err
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}
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err = taskQuery("update task set title=?, content=?, cat_id=?, priority = ? where id=? and user_id=?", title, content, categoryID, priority, id, userID)
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return err
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}
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//taskQuery encapsulates running multiple queries which don't do much things
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func taskQuery(sql string, args ...interface{}) error {
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log.Print("inside task query")
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SQL := database.prepare(sql)
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tx := database.begin()
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_, err = tx.Stmt(SQL).Exec(args...)
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if err != nil {
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log.Println("taskQuery: ", err)
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tx.Rollback()
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} else {
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err = tx.Commit()
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if err != nil {
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log.Println(err)
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return err
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}
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log.Println("Commit successful")
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}
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return err
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}
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//SearchTask is used to return the search results depending on the query
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func SearchTask(username, query string) (types.Context, error) {
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var tasks []types.Task
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var task types.Task
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var TaskCreated time.Time
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var context types.Context
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comments, err := GetComments(username)
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if err != nil {
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log.Println("SearchTask: something went wrong in finding comments")
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}
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userID, err := GetUserID(username)
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if err != nil {
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return context, err
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}
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stmt := "select t.id, title, content, created_date, priority, c.name from task t, category c where t.user_id=? and c.id = t.cat_id and (title like '%" + query + "%' or content like '%" + query + "%') order by created_date desc"
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rows := database.query(stmt, userID, query, query)
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defer rows.Close()
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for rows.Next() {
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err := rows.Scan(&task.Id, &task.Title, &task.Content, &TaskCreated, &task.Priority, &task.Category)
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if err != nil {
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log.Println(err)
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}
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if comments[task.Id] != nil {
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task.Comments = comments[task.Id]
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}
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task.Title = strings.Replace(task.Title, query, "<span class='highlight'>"+query+"</span>", -1)
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task.Content = strings.Replace(task.Content, query, "<span class='highlight'>"+query+"</span>", -1)
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task.Content = string(md.Markdown([]byte(task.Content)))
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TaskCreated = TaskCreated.Local()
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CurrentTime := time.Now().Local()
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week := TaskCreated.AddDate(0, 0, 7)
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if (week.String() < CurrentTime.String()) && (task.Priority != "1") {
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task.IsOverdue = true // If one week then overdue by default
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}
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task.Created = TaskCreated.Format("Jan 2 2006")
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tasks = append(tasks, task)
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}
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context = types.Context{Tasks: tasks, Search: query, Navigation: "search"}
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return context, nil
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}
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//GetComments is used to get comments, all of them.
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//We do not want 100 different pages to show tasks, we want to use as few pages as possible
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//so we are going to populate everything on the damn home pages
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func GetComments(username string) (map[int][]types.Comment, error) {
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commentMap := make(map[int][]types.Comment)
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var taskID int
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var comment types.Comment
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var created time.Time
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userID, err := GetUserID(username)
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if err != nil {
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return commentMap, err
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}
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stmt := "select c.id, c.taskID, c.content, c.created, u.username from comments c, task t, user u where t.id=c.taskID and c.user_id=t.user_id and t.user_id=u.id and u.id=?"
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rows := database.query(stmt, userID)
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defer rows.Close()
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for rows.Next() {
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err := rows.Scan(&comment.ID, &taskID, &comment.Content, &created, &comment.Username)
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comment.Content = string(md.Markdown([]byte(comment.Content)))
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if err != nil {
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return commentMap, err
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}
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// comment.Content = string(md.Markdown([]byte(comment.Content))) ## have to fix the <p> issue markdown support
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created = created.Local()
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comment.Created = created.Format("Jan 2 2006 15:04:05")
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commentMap[taskID] = append(commentMap[taskID], comment)
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}
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return commentMap, nil
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}
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//AddComments will be used to add comments in the database
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func AddComments(username string, id int, comment string) error {
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userID, err := GetUserID(username)
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if err != nil {
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return err
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}
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stmt := "insert into comments(taskID, content, created, user_id) values (?,?,datetime(),?)"
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err = taskQuery(stmt, id, comment, userID)
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if err != nil {
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return err
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}
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log.Println("added comment to task ID ", id)
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return nil
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}
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