package probe

import (
	"database/sql"
	"strings"
)

// Meta is one agent's probe display/operations metadata (hub node row's
// operator-owned half, ITEM7-SCOPE §5.2): what the public page shows
// beyond the machine's own reports — price/expiry/plan figures, the
// public switch and ordering, grouping and the public remark, the
// notify opt-in and the hand-set address/country pins. Rows are
// ensured with hub defaults on the agent's first report; the editing
// surface (B3) reads and writes them here.
type Meta struct {
	AgentID         int64
	Price           float64
	Currency        string
	BillingCycle    string
	ExpiresAt       *string // "2006-01-02" or nil
	TrafficLimit    int64
	TrafficMode     string
	TrafficResetDay int64
	Public          bool
	Sort            int64
	GroupName       string
	PublicRemark    string
	Notify          bool
	CountryPin      string
	IPv4Pin         string
	IPv6Pin         string
}

// DefaultMeta returns the metadata of an agent that has no row yet —
// the same values the row would carry once ensured (the probe_meta
// DDL defaults).
func DefaultMeta(agentID int64) Meta {
	return Meta{
		AgentID:         agentID,
		Currency:        "USD",
		BillingCycle:    "monthly",
		TrafficMode:     "sum",
		TrafficResetDay: 1,
		Public:          true,
	}
}

const metaColumns = `agent_id, price, currency, billing_cycle, expires_at,
	traffic_limit, traffic_mode, traffic_reset_day, public, sort,
	group_name, public_remark, notify, country_pin, ipv4_pin, ipv6_pin`

func scanMeta(sc interface{ Scan(...any) error }) (Meta, error) {
	var m Meta
	var expires sql.NullString
	var public, notify int64
	if err := sc.Scan(&m.AgentID, &m.Price, &m.Currency, &m.BillingCycle, &expires,
		&m.TrafficLimit, &m.TrafficMode, &m.TrafficResetDay, &public, &m.Sort,
		&m.GroupName, &m.PublicRemark, &notify, &m.CountryPin, &m.IPv4Pin, &m.IPv6Pin); err != nil {
		return Meta{}, err
	}
	if expires.Valid && strings.TrimSpace(expires.String) != "" {
		v := expires.String
		m.ExpiresAt = &v
	}
	m.Public = public != 0
	m.Notify = notify != 0
	return m, nil
}

// Meta reads one agent's metadata row. ok is false when the agent has
// no row yet (it never reported); callers then use DefaultMeta.
func (s *Store) Meta(agentID int64) (Meta, bool, error) {
	row := s.db.QueryRow(`SELECT `+metaColumns+` FROM probe_meta WHERE agent_id = ?`, agentID)
	m, err := scanMeta(row)
	if err == sql.ErrNoRows {
		return Meta{}, false, nil
	}
	if err != nil {
		return Meta{}, false, err
	}
	return m, true, nil
}

// AllMeta reads every metadata row, keyed by agent id.
func (s *Store) AllMeta() (map[int64]Meta, error) {
	rows, err := s.db.Query(`SELECT ` + metaColumns + ` FROM probe_meta`)
	if err != nil {
		return nil, err
	}
	defer rows.Close()
	out := make(map[int64]Meta)
	for rows.Next() {
		m, err := scanMeta(rows)
		if err != nil {
			return nil, err
		}
		out[m.AgentID] = m
	}
	return out, rows.Err()
}

// UpsertMeta writes one agent's metadata row (insert or full replace).
func (s *Store) UpsertMeta(m Meta) error {
	var expires any
	if m.ExpiresAt != nil && strings.TrimSpace(*m.ExpiresAt) != "" {
		expires = *m.ExpiresAt
	}
	_, err := s.db.Exec(
		`INSERT INTO probe_meta (`+metaColumns+`) VALUES (?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)
		 ON CONFLICT(agent_id) DO UPDATE SET
		   price=excluded.price, currency=excluded.currency,
		   billing_cycle=excluded.billing_cycle, expires_at=excluded.expires_at,
		   traffic_limit=excluded.traffic_limit, traffic_mode=excluded.traffic_mode,
		   traffic_reset_day=excluded.traffic_reset_day, public=excluded.public,
		   sort=excluded.sort, group_name=excluded.group_name,
		   public_remark=excluded.public_remark, notify=excluded.notify,
		   country_pin=excluded.country_pin, ipv4_pin=excluded.ipv4_pin,
		   ipv6_pin=excluded.ipv6_pin`,
		m.AgentID, m.Price, m.Currency, m.BillingCycle, expires,
		m.TrafficLimit, m.TrafficMode, m.TrafficResetDay, boolToInt(m.Public), m.Sort,
		m.GroupName, m.PublicRemark, boolToInt(m.Notify), m.CountryPin, m.IPv4Pin, m.IPv6Pin)
	return err
}

func boolToInt(b bool) int64 {
	if b {
		return 1
	}
	return 0
}

// DeleteAgentData removes every probe row of an agent that no longer
// exists: metadata, the traffic ledger and both history tiers. The
// hub keeps history inside its own node table; here probe.db is a
// separate file, so the panel-side agent deletion calls this to keep
// the two stores in step (B2 report §6 cleanup point).
func (s *Store) DeleteAgentData(agentID int64) error {
	tx, err := s.db.Begin()
	if err != nil {
		return err
	}
	defer tx.Rollback()
	for _, table := range []string{
		"probe_meta", "probe_traffic", "probe_metric",
		"probe_metric_hour", "probe_ping_record", "probe_ping_hour",
		"probe_ping_node",
	} {
		if _, err := tx.Exec(`DELETE FROM `+table+` WHERE agent_id = ?`, agentID); err != nil {
			return err
		}
	}
	return tx.Commit()
}