package main

import (
	"database/sql"
	"fmt"
	"html/template"
	"log"
	"net/http"
	"time"

	_ "github.com/mattn/go-sqlite3"
)

func CreateTasklist(title string, db *sql.DB) Tasklist {
	tasks := []Task{
		{
			Name: "Promotion",
			Description: `
			(make a post on the website to promote openings times and for each film event, posting description and announcement on telegram channel, forwarding it to telegram groups, making a fb event, making a post about fb event on the fb page, sharing the event to fb groups)
			`,
		},
		{
			Name:        "Opening",
			Description: `(checking toilet if there is toilet paper and fresh towel, refill fridge, sorting deposit bottles, quickly tidy up the place)`,
		},
		{
			Name:        "Entering",
			Description: `(checking if there are new books to be entered into the library catalogue, categorizing them, stamping them, putting them into the book shelf)`,
		},
		{
			Name:        "CleanUp",
			Description: `(includes cleaning up, tidying up, rearranging chairs,  closing or arranging somebody to lock the front and back doors)`,
		},
		{
			Name:        "Weekly Toilet & Kitchen",
			Description: `(whiping the floor in kitchen and bathroom, clean toilet, clean sink, check soap and menstruation supplies)`,
		},
	}

	stmt, err := db.Prepare("select promotion, opening, entering, cleanup, weeklytoilet from tasklists where name = ?")
	if err != nil {
		fmt.Println(err)
	}
	defer stmt.Close()
	var promotion, opening, entering, cleanup, weeklytoilet string
	err = stmt.QueryRow(title).Scan(&promotion, &opening, &entering, &cleanup, &weeklytoilet)

	if err == nil {
		tasks[0].Value = promotion
		tasks[1].Value = opening
		tasks[2].Value = entering
		tasks[3].Value = cleanup
		tasks[4].Value = weeklytoilet
	}

	return Tasklist{
		Title:   title,
		Tasks:   tasks,
		Updated: false,
	}
}

func InsertToDB(tasklist Tasklist, db *sql.DB) {
	stmt, err := db.Prepare("select name from tasklists where name = ?")
	if err != nil {
		log.Fatal(err)
	}
	defer stmt.Close()
	var name string
	err = stmt.QueryRow(tasklist.Title).Scan(&name)
	if err != nil {
		db.Exec("insert into tasklists(name, promotion, opening, entering, cleanup, weeklytoilet) values(?, ?, ?, ?, ?, ?)", tasklist.Title, tasklist.Tasks[0].Value, tasklist.Tasks[1].Value, tasklist.Tasks[2].Value, tasklist.Tasks[3].Value, tasklist.Tasks[4].Value)
	} else {
		_, err := db.Exec("update tasklists set promotion = ?,opening = ?,entering = ?,cleanup = ?,weeklytoilet = ? where name = ?", tasklist.Tasks[0].Value, tasklist.Tasks[1].Value, tasklist.Tasks[2].Value, tasklist.Tasks[3].Value, tasklist.Tasks[4].Value, tasklist.Title)
		if err != nil {
			fmt.Println("Error during update: ", err)
		}
	}
}

type Task struct {
	Name        string
	Description string
	Value       string
}

type Tasklist struct {
	Title   string
	Tasks   []Task
	Updated bool
}

type Tasklists struct {
	Tasklists []Tasklist
}

type QueryResult struct {
	Tasklists []Tasklist
}

func (n *Tasklist) Print() {
	fmt.Println(n.Title)

	for _, task := range n.Tasks {
		fmt.Println("\t Name: ", task.Name)
		fmt.Println("\t Descr: ", task.Description)
		fmt.Println("\t Value: ", task.Value)
	}
}

func GetNextNDaysOfName(n int, name time.Weekday, current time.Time) []time.Time {
	result := make([]time.Time, n)

	for index := 0; index < n; {
		if current.Weekday() == name {
			result[index] = current
			index++
		}

		current = current.AddDate(0, 0, 1)
	}

	return result
}

const DB_NAME = "./tasklist.db"
const TASK_DAY = time.Tuesday
const AMOUNT_DAYS = 4

func main() {
	db, err := sql.Open("sqlite3", DB_NAME)
	if err != nil {
		log.Fatal(err)
	}
	defer db.Close()

	sqlStmt := `
	create table if not exists tasklists (name test not null primary key, promotion text, opening text, entering text, cleanup text, weeklytoilet text);
	`
	_, err = db.Exec(sqlStmt)
	if err != nil {
		log.Printf("%q: %s\n", err, sqlStmt)
		return
	}

	tmpl := template.Must(template.ParseFiles("forms.html"))
	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
		days := GetNextNDaysOfName(AMOUNT_DAYS, TASK_DAY, time.Now())
		tasklist_arr := QueryResult{make([]Tasklist, AMOUNT_DAYS)}

		for idx, day := range days {
			tasklist_arr.Tasklists[idx] = CreateTasklist(day.Format("Jan 2, 2006"), db)
		}

		if r.Method != http.MethodPost {
			tmpl.Execute(w, tasklist_arr)
			return
		}

		for idx, task := range tasklist_arr.Tasklists {
			if task.Title == r.FormValue("Name") {
				for idx2 := range task.Tasks {
					task.Tasks[idx2].Value = r.FormValue(task.Tasks[idx2].Name)
				}
				tasklist_arr.Tasklists[idx].Updated = true
				InsertToDB(tasklist_arr.Tasklists[idx], db)
			}
		}

		tmpl.Execute(w, tasklist_arr)

	})

	http.ListenAndServe(":8080", nil)
}