// rules.go：域名策略规则表（match_type=suffix|glob，action=direct|pool:<name>|deny）。
// gateway policy 与 proxymanager 共享本表 + 热载（design-arch §5.3）。
package store

import (
	"fmt"
)

// Rule 单条域名规则。
type Rule struct {
	ID        int64
	MatchType string // suffix | glob
	Value     string // 如 .onesvm.com / *.github.com
	Action    string // direct | pool:<name> | deny
	Sort      int    // 越小越优先（由具体到一般）
}

// RulesAll 按 sort 升序取全部规则。
func (d *DB) RulesAll() ([]Rule, error) {
	rows, err := d.raw.Query(
		`SELECT id, match_type, value, action, sort FROM rules ORDER BY sort ASC, id ASC`)
	if err != nil {
		return nil, fmt.Errorf("store: RulesAll: %w", err)
	}
	defer rows.Close()
	var out []Rule
	for rows.Next() {
		var r Rule
		if err := rows.Scan(&r.ID, &r.MatchType, &r.Value, &r.Action, &r.Sort); err != nil {
			return nil, fmt.Errorf("store: RulesAll scan: %w", err)
		}
		out = append(out, r)
	}
	if err := rows.Err(); err != nil {
		return nil, fmt.Errorf("store: RulesAll rows: %w", err)
	}
	return out, nil
}

// RuleUpsert 按唯一键(match_type,value)插入或更新 action/sort。
func (d *DB) RuleUpsert(matchType, value, action string, sort int) error {
	if matchType != "suffix" && matchType != "glob" {
		return fmt.Errorf("store: RuleUpsert 非法 match_type %q", matchType)
	}
	_, err := d.raw.Exec(
		`INSERT INTO rules(match_type, value, action, sort) VALUES(?, ?, ?, ?)
		 ON CONFLICT(match_type, value) DO UPDATE SET action = excluded.action, sort = excluded.sort`,
		matchType, value, action, sort)
	if err != nil {
		return fmt.Errorf("store: RuleUpsert: %w", err)
	}
	return nil
}

// RuleDelete 删除单条规则。
func (d *DB) RuleDelete(matchType, value string) error {
	res, err := d.raw.Exec(
		`DELETE FROM rules WHERE match_type = ? AND value = ?`, matchType, value)
	if err != nil {
		return fmt.Errorf("store: RuleDelete: %w", err)
	}
	if n, _ := res.RowsAffected(); n == 0 {
		return ErrNotFound
	}
	return nil
}