package store

import (
	"time"

	"daili/internal/domain"
)

// Stats 大屏统计数据。
type Stats struct {
	Customers    int
	ActiveSubs   int
	PausedSubs   int
	DueToday     int
	Due7         int
	DueTodaySubs []Subscription
	Heat         map[string]int // 结束日 -> 该日到期数量
	MonthDue     int
	Top          []Subscription
	TodayTasks   int
	TodayDone    int
}

// Badges 顶栏常驻徽标。
func (db *DB) Badges(today time.Time) (dueToday, due3, due7 int, err error) {
	t := domain.Date(today)
	const notArchived = ` AND IFNULL((SELECT archived FROM customers c WHERE c.id=customer_id),0)=0`
	if err = db.sql.QueryRow(`SELECT COUNT(*) FROM subscriptions WHERE status<>'closed' AND end_date=?`+notArchived, t).Scan(&dueToday); err != nil {
		return
	}
	if err = db.sql.QueryRow(`SELECT COUNT(*) FROM subscriptions WHERE status<>'closed' AND end_date BETWEEN ? AND ?`+notArchived,
		t, domain.Date(domain.AddDays(today, 2))).Scan(&due3); err != nil {
		return
	}
	err = db.sql.QueryRow(`SELECT COUNT(*) FROM subscriptions WHERE status<>'closed' AND end_date BETWEEN ? AND ?`+notArchived,
		t, domain.Date(domain.AddDays(today, 6))).Scan(&due7)
	return
}

// ScreenStats 汇总大屏所需数据。
func (db *DB) ScreenStats(today time.Time, warnDays int) (*Stats, error) {
	st := &Stats{Heat: map[string]int{}}
	var err error
	if st.Customers, err = db.CustomerCount(); err != nil {
		return nil, err
	}
	if st.ActiveSubs, err = db.CountActiveSubs(domain.Date(today)); err != nil {
		return nil, err
	}
	if err = db.sql.QueryRow(`SELECT COUNT(*) FROM subscriptions WHERE status='paused'
		AND IFNULL((SELECT archived FROM customers c WHERE c.id=customer_id),0)=0`).Scan(&st.PausedSubs); err != nil {
		return nil, err
	}
	if err = db.sql.QueryRow(`SELECT COUNT(*) FROM subscriptions WHERE status<>'closed' AND end_date=?
		AND IFNULL((SELECT archived FROM customers c WHERE c.id=customer_id),0)=0`,
		domain.Date(today)).Scan(&st.DueToday); err != nil {
		return nil, err
	}
	if err = db.sql.QueryRow(`SELECT COUNT(*) FROM subscriptions WHERE status<>'closed' AND end_date BETWEEN ? AND ?
		AND IFNULL((SELECT archived FROM customers c WHERE c.id=customer_id),0)=0`,
		domain.Date(today), domain.Date(domain.AddDays(today, 6))).Scan(&st.Due7); err != nil {
		return nil, err
	}
	if st.DueTodaySubs, err = db.DueOn(domain.Date(today)); err != nil {
		return nil, err
	}

	// 本月到期热力
	ms := domain.MonthStart(today.Year(), today.Month())
	me := domain.MonthEnd(today.Year(), today.Month())
	rows, err := db.sql.Query(`SELECT end_date, COUNT(*) FROM subscriptions s
		JOIN customers c ON c.id=s.customer_id
		WHERE s.status<>'closed' AND IFNULL(c.archived,0)=0 AND s.end_date BETWEEN ? AND ? GROUP BY s.end_date`,
		domain.Date(ms), domain.Date(me))
	if err != nil {
		return nil, err
	}
	for rows.Next() {
		var d string
		var n int
		if err := rows.Scan(&d, &n); err != nil {
			rows.Close()
			return nil, err
		}
		st.Heat[d] = n
		st.MonthDue += n
	}
	rows.Close()

	// TOP：按日按剩余天数、按次按剩余次数，各自排序后交替取前 10
	t := domain.Date(today)
	daySubs, err := db.querySubs(subSelect+` WHERE s.status<>'closed' AND IFNULL(c.archived,0)=0 AND s.unit='day' AND s.end_date>=?
		ORDER BY s.end_date ASC LIMIT 12`, t)
	if err != nil {
		return nil, err
	}
	cntSubs, err := db.querySubs(subSelect+` WHERE s.status<>'closed' AND IFNULL(c.archived,0)=0 AND s.unit='count' AND s.used_count < s.total_count
		AND (IFNULL(s.end_date,'')='' OR s.end_date>=?)
		ORDER BY (s.total_count - s.used_count) ASC LIMIT 12`, t)
	if err != nil {
		return nil, err
	}
	for i := 0; i < 10 && len(st.Top) < 10; i++ {
		if i < len(daySubs) {
			st.Top = append(st.Top, daySubs[i])
		}
		if len(st.Top) < 10 && i < len(cntSubs) {
			st.Top = append(st.Top, cntSubs[i])
		}
		if i >= len(daySubs) && i >= len(cntSubs) {
			break
		}
	}
	_ = warnDays
	return st, nil
}

// RecentDue 返回未来 n 天内到期的订阅（按到期日排序）。
func (db *DB) RecentDue(from string, days int) ([]Subscription, error) {
	to := domain.Date(domain.AddDays(domain.ParseDateOr(from, domain.Today()), days-1))
	return db.querySubs(subSelect+` WHERE s.status<>'closed' AND IFNULL(c.archived,0)=0 AND s.end_date BETWEEN ? AND ?
		ORDER BY s.end_date, s.id`, from, to)
}