package models

import (
	"database/sql"
	"errors"
	"log"
	"time"
)

type WorkWeek struct {
	Id        int
	WorkDays  []WorkDay
	User      User
	WeekStart time.Time
	WorkHours time.Duration
}

type WeekStatus int8

const (
	None WeekStatus = iota
	Sent
	Accepted
)

func (w *WorkWeek) GetWeek(user User, tsMonday time.Time, populateDays bool) WorkWeek {
	var week WorkWeek
	if populateDays {
		week.WorkDays = (*WorkDay).GetWorkDays(nil, user.CardUID, tsMonday, tsMonday.Add(7*24*time.Hour))
		week.WorkHours = aggregateWorkTime(week.WorkDays)
	}
	week.User = user
	week.WeekStart = tsMonday
	return week
}

func (w *WorkWeek) CheckStatus() WeekStatus {
	weekStatus := None
	qStr, err := DB.Prepare(`SELECT bestaetigt FROM wochen_report WHERE woche_start = $1::DATE AND personal_nummer = $2;`)
	if err != nil {
		log.Println("Error preparing SQL statement", err)
		return weekStatus
	}
	defer qStr.Close()
	var beastatigt bool
	err = qStr.QueryRow(w.WeekStart, w.User.PersonalNummer).Scan(&beastatigt)
	if err == sql.ErrNoRows {
		return weekStatus
	}
	if err != nil {
		log.Println("Error querying database", err)
		return weekStatus
	}
	if beastatigt {
		weekStatus = Accepted
	} else {
		weekStatus = Sent
	}
	return weekStatus
}

func (w *WorkWeek) GetWorkHourString() string {
	return formatDuration(w.WorkHours)
}

func aggregateWorkTime(days []WorkDay) time.Duration {
	var workTime time.Duration
	for _, day := range days {
		workTime += day.workTime
	}
	return workTime
}

func (w *WorkWeek) GetSendWeeks(user User) []WorkWeek {
	var weeks []WorkWeek
	qStr, err := DB.Prepare(`SELECT id, woche_start::DATE FROM wochen_report WHERE bestaetigt = FALSE AND personal_nummer = $1;`)
	if err != nil {
		log.Println("Error preparing SQL statement", err)
		return weeks
	}
	defer qStr.Close()

	rows, err := qStr.Query(user.PersonalNummer)
	if err != nil {
		log.Println("Error querining db!", err)
		return weeks
	}
	defer rows.Close()
	for rows.Next() {
		var week WorkWeek
		week.User = user
		if err := rows.Scan(&week.Id, &week.WeekStart); err != nil {
			log.Println("Error scanning row!", err)
			return weeks
		}
		week.WorkDays = (*WorkDay).GetWorkDays(nil, user.CardUID, week.WeekStart, week.WeekStart.Add(7*24*time.Hour))
		week.WorkHours = aggregateWorkTime(week.WorkDays)
		weeks = append(weeks, week)
	}
	if err = rows.Err(); err != nil {
		return weeks
	}

	return weeks
}

var ErrRunningWeek = errors.New("Week is in running week")

// creates a new entry in the woche_report table with the given workweek
func (w *WorkWeek) Send() error {
	var qStr *sql.Stmt
	var err error
	if time.Since(w.WeekStart) < 5*24*time.Hour {
		log.Println("Cannot send week, because it's the running week!")
		return ErrRunningWeek
	}
	if w.CheckStatus() != None {
		qStr, err = DB.Prepare(`UPDATE "wochen_report" SET bestaetigt = FALSE WHERE personal_nummer = $1 AND woche_start = $2;`)
		if err != nil {
			log.Println("Error preparing SQL statement", err)
			return err
		}
	} else {
		qStr, err = DB.Prepare(`INSERT INTO wochen_report (personal_nummer, woche_start) VALUES ($1, $2);`)
		if err != nil {
			log.Println("Error preparing SQL statement", err)
			return err
		}
	}
	_, err = qStr.Exec(w.User.PersonalNummer, w.WeekStart)
	if err != nil {
		log.Println("Error executing query!", err)
		return err
	}
	return nil

}

func (w *WorkWeek) Accept() error {
	qStr, err := DB.Prepare(`UPDATE "wochen_report" SET bestaetigt = TRUE WHERE personal_nummer = $1 AND woche_start = $2;`)
	if err != nil {
		log.Println("Error preparing SQL statement", err)
		return err
	}
	_, err = qStr.Exec(w.User.PersonalNummer, w.WeekStart)
	if err != nil {
		log.Println("Error executing query!", err)
		return err
	}
	return nil
}