package primary

import (
	"blackforestbytes.com/simplecloudnotifier/models"
	"database/sql"
	"gogs.mikescher.com/BlackForestBytes/goext/sq"
	"time"
)

func (db *Database) GetChannelByName(ctx TxContext, userid models.UserID, chanName string) (*models.Channel, error) {
	tx, err := ctx.GetOrCreateTransaction(db)
	if err != nil {
		return nil, err
	}

	rows, err := tx.Query(ctx, "SELECT * FROM channels WHERE owner_user_id = :uid AND internal_name = :nam LIMIT 1", sq.PP{
		"uid": userid,
		"nam": chanName,
	})
	if err != nil {
		return nil, err
	}

	channel, err := models.DecodeChannel(rows)
	if err == sql.ErrNoRows {
		return nil, nil
	}
	if err != nil {
		return nil, err
	}

	return &channel, nil
}

func (db *Database) GetChannelByID(ctx TxContext, chanid models.ChannelID) (*models.Channel, error) {
	tx, err := ctx.GetOrCreateTransaction(db)
	if err != nil {
		return nil, err
	}

	rows, err := tx.Query(ctx, "SELECT * FROM channels WHERE channel_id = :cid LIMIT 1", sq.PP{
		"cid": chanid,
	})
	if err != nil {
		return nil, err
	}

	channel, err := models.DecodeChannel(rows)
	if err == sql.ErrNoRows {
		return nil, nil
	}
	if err != nil {
		return nil, err
	}

	return &channel, nil
}

func (db *Database) CreateChannel(ctx TxContext, userid models.UserID, dispName string, intName string, subscribeKey string) (models.Channel, error) {
	tx, err := ctx.GetOrCreateTransaction(db)
	if err != nil {
		return models.Channel{}, err
	}

	now := time.Now().UTC()

	channelid := models.NewChannelID()

	_, err = tx.Exec(ctx, "INSERT INTO channels (channel_id, owner_user_id, display_name, internal_name, description_name, subscribe_key, timestamp_created) VALUES (:cid, :ouid, :dnam, :inam, :hnam, :subkey, :ts)", sq.PP{
		"cid":    channelid,
		"ouid":   userid,
		"dnam":   dispName,
		"inam":   intName,
		"hnam":   nil,
		"subkey": subscribeKey,
		"ts":     time2DB(now),
	})
	if err != nil {
		return models.Channel{}, err
	}

	return models.Channel{
		ChannelID:         channelid,
		OwnerUserID:       userid,
		DisplayName:       dispName,
		InternalName:      intName,
		SubscribeKey:      subscribeKey,
		TimestampCreated:  now,
		TimestampLastSent: nil,
		MessagesSent:      0,
	}, nil
}

func (db *Database) ListChannelsByOwner(ctx TxContext, userid models.UserID, subUserID models.UserID) ([]models.ChannelWithSubscription, error) {
	tx, err := ctx.GetOrCreateTransaction(db)
	if err != nil {
		return nil, err
	}

	order := " ORDER BY channels.timestamp_created ASC, channels.channel_id ASC "

	rows, err := tx.Query(ctx, "SELECT channels.*, sub.* FROM channels LEFT JOIN subscriptions AS sub ON channels.channel_id = sub.channel_id AND sub.subscriber_user_id = :subuid WHERE owner_user_id = :ouid"+order, sq.PP{
		"ouid":   userid,
		"subuid": subUserID,
	})
	if err != nil {
		return nil, err
	}

	data, err := models.DecodeChannelsWithSubscription(rows)
	if err != nil {
		return nil, err
	}

	return data, nil
}

func (db *Database) ListChannelsBySubscriber(ctx TxContext, userid models.UserID, confirmed *bool) ([]models.ChannelWithSubscription, error) {
	tx, err := ctx.GetOrCreateTransaction(db)
	if err != nil {
		return nil, err
	}

	confCond := ""
	if confirmed != nil && *confirmed {
		confCond = " AND sub.confirmed = 1"
	} else if confirmed != nil && !*confirmed {
		confCond = " AND sub.confirmed = 0"
	}

	order := " ORDER BY channels.timestamp_created ASC, channels.channel_id ASC "

	rows, err := tx.Query(ctx, "SELECT channels.*, sub.* FROM channels LEFT JOIN subscriptions AS sub on channels.channel_id = sub.channel_id AND sub.subscriber_user_id = :subuid WHERE sub.subscription_id IS NOT NULL "+confCond+order, sq.PP{
		"subuid": userid,
	})
	if err != nil {
		return nil, err
	}

	data, err := models.DecodeChannelsWithSubscription(rows)
	if err != nil {
		return nil, err
	}

	return data, nil
}

func (db *Database) ListChannelsByAccess(ctx TxContext, userid models.UserID, confirmed *bool) ([]models.ChannelWithSubscription, error) {
	tx, err := ctx.GetOrCreateTransaction(db)
	if err != nil {
		return nil, err
	}

	confCond := "OR (sub.subscription_id IS NOT NULL)"
	if confirmed != nil && *confirmed {
		confCond = "OR (sub.subscription_id IS NOT NULL AND sub.confirmed = 1)"
	} else if confirmed != nil && !*confirmed {
		confCond = "OR (sub.subscription_id IS NOT NULL AND sub.confirmed = 0)"
	}

	order := " ORDER BY channels.timestamp_created ASC, channels.channel_id ASC "

	rows, err := tx.Query(ctx, "SELECT channels.*, sub.* FROM channels LEFT JOIN subscriptions AS sub on channels.channel_id = sub.channel_id AND sub.subscriber_user_id = :subuid WHERE owner_user_id = :ouid "+confCond+order, sq.PP{
		"ouid":   userid,
		"subuid": userid,
	})
	if err != nil {
		return nil, err
	}

	data, err := models.DecodeChannelsWithSubscription(rows)
	if err != nil {
		return nil, err
	}

	return data, nil
}

func (db *Database) GetChannel(ctx TxContext, userid models.UserID, channelid models.ChannelID, enforceOwner bool) (models.ChannelWithSubscription, error) {
	tx, err := ctx.GetOrCreateTransaction(db)
	if err != nil {
		return models.ChannelWithSubscription{}, err
	}

	params := sq.PP{
		"cid":    channelid,
		"subuid": userid,
	}

	selectors := "channels.*, sub.*"

	join := "LEFT JOIN subscriptions AS sub on channels.channel_id = sub.channel_id AND sub.subscriber_user_id = :subuid"

	cond := "channels.channel_id = :cid"
	if enforceOwner {
		cond = "owner_user_id = :ouid AND channels.channel_id = :cid"
		params["ouid"] = userid
	}

	rows, err := tx.Query(ctx, "SELECT "+selectors+" FROM channels "+join+" WHERE "+cond+" LIMIT 1", params)
	if err != nil {
		return models.ChannelWithSubscription{}, err
	}

	channel, err := models.DecodeChannelWithSubscription(rows)
	if err != nil {
		return models.ChannelWithSubscription{}, err
	}

	return channel, nil
}

func (db *Database) IncChannelMessageCounter(ctx TxContext, channel models.Channel) error {
	tx, err := ctx.GetOrCreateTransaction(db)
	if err != nil {
		return err
	}

	_, err = tx.Exec(ctx, "UPDATE channels SET messages_sent = :ctr, timestamp_lastsent = :ts WHERE channel_id = :cid", sq.PP{
		"ctr": channel.MessagesSent + 1,
		"cid": time2DB(time.Now()),
		"ts":  channel.ChannelID,
	})
	if err != nil {
		return err
	}

	return nil
}

func (db *Database) UpdateChannelSubscribeKey(ctx TxContext, channelid models.ChannelID, newkey string) error {
	tx, err := ctx.GetOrCreateTransaction(db)
	if err != nil {
		return err
	}

	_, err = tx.Exec(ctx, "UPDATE channels SET subscribe_key = :key WHERE channel_id = :cid", sq.PP{
		"key": newkey,
		"cid": channelid,
	})
	if err != nil {
		return err
	}

	return nil
}

func (db *Database) UpdateChannelDisplayName(ctx TxContext, channelid models.ChannelID, dispname string) error {
	tx, err := ctx.GetOrCreateTransaction(db)
	if err != nil {
		return err
	}

	_, err = tx.Exec(ctx, "UPDATE channels SET display_name = :nam WHERE channel_id = :cid", sq.PP{
		"nam": dispname,
		"cid": channelid,
	})
	if err != nil {
		return err
	}

	return nil
}

func (db *Database) UpdateChannelDescriptionName(ctx TxContext, channelid models.ChannelID, descname *string) error {
	tx, err := ctx.GetOrCreateTransaction(db)
	if err != nil {
		return err
	}

	_, err = tx.Exec(ctx, "UPDATE channels SET description_name = :nam WHERE channel_id = :cid", sq.PP{
		"nam": descname,
		"cid": channelid,
	})
	if err != nil {
		return err
	}

	return nil
}