package db

import (
	"context"
	"database/sql"
	"time"
)

type BlacklistedUser struct {
	ID            int64
	DiscordID     string
	Reason        sql.NullString
	BlacklistedBy string
	CreatedAt     time.Time
}

type UserBlacklistRepo struct{ db *sql.DB }

func NewUserBlacklistRepo(db *sql.DB) *UserBlacklistRepo { return &UserBlacklistRepo{db: db} }

func (r *UserBlacklistRepo) Add(ctx context.Context, discordID, reason, blacklistedBy string) error {
	_, err := r.db.ExecContext(ctx,
		`INSERT OR REPLACE INTO user_blacklist(discord_id,reason,blacklisted_by,created_at) VALUES(?,?,?,?)`,
		discordID, NullStr(reason), blacklistedBy, time.Now().UTC())
	return err
}

func (r *UserBlacklistRepo) Remove(ctx context.Context, discordID string) error {
	_, err := r.db.ExecContext(ctx, `DELETE FROM user_blacklist WHERE discord_id=?`, discordID)
	return err
}

func (r *UserBlacklistRepo) IsBlacklisted(ctx context.Context, discordID string) (bool, error) {
	var count int
	err := r.db.QueryRowContext(ctx, `SELECT COUNT(*) FROM user_blacklist WHERE discord_id=?`, discordID).Scan(&count)
	return count > 0, err
}

func (r *UserBlacklistRepo) List(ctx context.Context) ([]*BlacklistedUser, error) {
	rows, err := r.db.QueryContext(ctx,
		`SELECT id,discord_id,reason,blacklisted_by,created_at FROM user_blacklist ORDER BY created_at DESC`)
	if err != nil {
		return nil, err
	}
	defer rows.Close()
	var out []*BlacklistedUser
	for rows.Next() {
		var u BlacklistedUser
		if err := rows.Scan(&u.ID, &u.DiscordID, &u.Reason, &u.BlacklistedBy, &u.CreatedAt); err != nil {
			return nil, err
		}
		out = append(out, &u)
	}
	return out, rows.Err()
}