package public

import (
	"database/sql"
	"dorisbot/models"
	"errors"
	"time"
)

// FacebookPageModel -
type FacebookPageModel struct {
	ID       string    `db:"id"`
	LastPost string    `db:"lastpost"`
	Ctime    time.Time `db:"ctime"`
	Mtime    time.Time `db:"mtime"`
}

// NewFacebookPage -
func NewFacebookPage(id string) (page *FacebookPageModel, err error) {
	if len(id) == 0 {
		return nil, errors.New("id is empty")
	}
	page = &FacebookPageModel{
		ID: id,
	}
	return
}

// GetFacebookPageByID -
func GetFacebookPageByID(id string) (page *FacebookPageModel, err error) {
	if len(id) == 0 {
		return nil, errors.New("id is empty")
	}
	page = &FacebookPageModel{}
	db := models.GetConn()
	query := `select id, lastpost, ctime, mtime from public.facebook_page where id = $1`
	err = db.Get(page, query, id)
	if err != nil && err != sql.ErrNoRows {
		return
	}
	if err == sql.ErrNoRows {
		page = nil
	}
	return page, nil
}

// GetFacebookPageListByChannel -
func GetFacebookPageListByChannel(channel string) (pages []*FacebookPageModel, err error) {
	if len(channel) == 0 {
		return nil, errors.New("channel is empty")
	}
	db := models.GetConn()
	query := `
		select 
			fb.id, fb.lastpost, fb.ctime, fb.mtime 
		from public.facebook_page fb
		left join "discord"."channel_facebook_rt" rt
			on rt.facebook = fb.id
		left join "discord"."channel" ch
			on ch.id = rt.channel
		where ch.channel = $1`
	err = db.Select(&pages, query, channel)
	if err != nil {
		return nil, err
	}
	return
}

// GetFacebookPageByChannelAndID -
func GetFacebookPageByChannelAndID(id, channel string) (page *FacebookPageModel, err error) {
	if len(channel) == 0 || len(id) == 0 {
		return nil, errors.New("channel or id is empty")
	}
	db := models.GetConn()
	query := `
		select
			fb.id, fb.lastpost, fb.ctime, fb.mtime 
		from public.facebook_page fb
		left join "discord"."channel_facebook_rt" rt
			on rt.facebook = fb.id
		where fb.id = $1 and rt.channel = $2`
	result, err := db.Queryx(query, id, channel)
	if err != nil {
		return nil, err
	}

	if result.Next() {
		page = &FacebookPageModel{}
		err = result.StructScan(page)
		if err != nil && err != sql.ErrNoRows {
			return nil, err
		}
	}

	return
}

// GetAllFacebookPage -
func GetAllFacebookPage() (pages []*FacebookPageModel, err error) {
	db := models.GetConn()
	query := `select id, lastpost, ctime, mtime from public.facebook_page order by ctime`
	err = db.Select(&pages, query)
	if err != nil && err == sql.ErrNoRows {
		return nil, nil
	}
	return
}

// GetFacebookPageRange -
func GetFacebookPageRange(limit, offset int) (pages []*FacebookPageModel, err error) {
	if limit < 1 || offset < 0 {
		return nil, errors.New("input arg format error")
	}
	db := models.GetConn()
	query := `select id, lastpost, ctime, mtime from public.facebook_page order by ctime limit $1 offset $2`
	err = db.Select(&pages, query, limit, offset)
	if err != nil && err == sql.ErrNoRows {
		return nil, nil
	}
	return
}

// Write -
func (p *FacebookPageModel) Write() (err error) {
	db := models.GetConn()
	query := `insert into public.facebook_page (id) values (:id) returning *`
	rows, err := db.NamedQuery(query, p)
	if err != nil {
		return err
	}
	defer rows.Close()

	if rows.Next() {
		err = rows.StructScan(p)
		if err != nil {
			return err
		}
	}

	return
}

// UpdatePost -
func (p *FacebookPageModel) UpdatePost(post string) (err error) {
	db := models.GetConn()
	query := `update public.facebook_page set lastpost = $1, mtime = now() where id = $2`
	_, err = db.Exec(query, post, p.ID)
	if err != nil {
		return err
	}
	p.LastPost = post
	return
}