package main

import (
	// External
	werr "git.gibonuddevalla.se/go/wrappederror"

	// Standard
	"encoding/json"
	"fmt"
	"regexp"
	"strconv"
	"strings"
	"time"
)

func init() {
	fmt.Printf("")
}

type Schedule struct {
	ID            int
	UserID        int `json:"user_id" db:"user_id"`
	Node          Node
	ScheduleUUID  string `db:"schedule_uuid"`
	Time          time.Time
	RemindMinutes int `db:"remind_minutes"`
	Description   string
	Acknowledged  bool
}

func ScanForSchedules(timeOffset int, content string) (schedules []Schedule) { // {{{
	schedules = []Schedule{}

	rxp := regexp.MustCompile(`\{\s*([0-9]{4}-[0-9]{2}-[0-9]{2}\s+[0-9]{2}:[0-9]{2}(?::[0-9]{2})?)\s*\,\s*(?:(\d+)\s*(h|min)\s*,)?\s*([^\]]+?)\s*\}`)
	foundSchedules := rxp.FindAllStringSubmatch(content, -1)

	for _, data := range foundSchedules {
		// Missing seconds
		if strings.Count(data[1], ":") == 1 {
			data[1] = data[1] + ":00"
		}

		// Timezone calculations
		var timeTZ string
		if timeOffset < 0 {
			hours := (-timeOffset) / 60
			mins := (-timeOffset) % 60
			timeTZ = fmt.Sprintf("%s -%02d%02d", data[1], hours, mins)
		} else {
			hours := timeOffset / 60
			mins := timeOffset % 60
			timeTZ = fmt.Sprintf("%s +%02d%02d", data[1], hours, mins)
		}

		timestamp, err := time.Parse("2006-01-02 15:04:05 -0700", timeTZ)
		if err != nil {
			continue
		}

		// Reminder
		var remindMinutes int
		if data[2] != "" && data[3] != "" {
			value, _ := strconv.Atoi(data[2])
			unit := strings.ToLower(data[3])
			switch unit {
			case "min":
				remindMinutes = value
			case "h":
				remindMinutes = value * 60
			}
		}

		schedule := Schedule{
			Time:          timestamp,
			RemindMinutes: remindMinutes,
			Description:   data[4],
		}
		schedules = append(schedules, schedule)
	}

	return
} // }}}
func RetrieveSchedules(userID int, nodeID int) (schedules []Schedule, err error) { // {{{
	schedules = []Schedule{}

	res := service.Db.Conn.QueryRow(`
		WITH schedule_events AS (
			SELECT
				id,
				user_id,
				json_build_object('id', node_id) AS node,
				schedule_uuid,
				time - MAKE_INTERVAL(mins => remind_minutes) AS time,
				description,
				acknowledged
			FROM schedule
			WHERE
				user_id=$1 AND
				CASE
				WHEN $2 > 0 THEN node_id = $2
				ELSE true
				END
		)
		SELECT
			COALESCE(jsonb_agg(s.*), '[]'::jsonb)
		FROM schedule_events s
		`,
		userID,
		nodeID,
	)

	var data []byte
	err = res.Scan(&data)
	if err != nil {
		return
	}

	err = json.Unmarshal(data, &schedules)
	return
} // }}}

func (a Schedule) IsEqual(b Schedule) bool { // {{{
	return a.UserID == b.UserID &&
		a.Node.ID == b.Node.ID &&
		a.Time.Equal(b.Time) &&
		a.Description == b.Description
} // }}}
func (s *Schedule) Insert(queryable Queryable) error { // {{{
	res := queryable.QueryRow(`
		INSERT INTO schedule(user_id, node_id, time, remind_minutes, description)
		VALUES($1, $2, $3, $4, $5)
		RETURNING id
		`,
		s.UserID,
		s.Node.ID,
		s.Time,
		s.RemindMinutes,
		s.Description,
	)

	return res.Scan(&s.ID)
} // }}}
func (s *Schedule) Delete(queryable Queryable) error { // {{{
	_, err := queryable.Exec(`
		DELETE FROM schedule
		WHERE
			user_id = $1 AND
			id = $2
		`,
		s.UserID,
		s.ID,
	)
	return err
} // }}}

func ExpiredSchedules() (schedules []Schedule) { // {{{
	schedules = []Schedule{}

	res, err := service.Db.Conn.Queryx(`
		SELECT
			id,
			user_id,
			node_id,
			schedule_uuid,
			time - MAKE_INTERVAL(mins => remind_minutes) AS time,
			description
		FROM schedule
		WHERE
			(time - MAKE_INTERVAL(mins => remind_minutes)) < NOW() AND
			NOT acknowledged
		ORDER BY
			time ASC
	`)
	if err != nil {
		err = werr.Wrap(err).WithCode("002-0009")
		return
	}
	defer res.Close()

	for res.Next() {
		s := Schedule{}
		if err = res.Scan(&s.ID, &s.UserID, &s.Node.ID, &s.ScheduleUUID, &s.Time, &s.Description); err != nil {
			werr.Wrap(err).WithCode("002-000a")
			continue
		}
		schedules = append(schedules, s)
	}
	return
} // }}}