package main

import (
	"fmt"
	"log"
)

type PlayerService struct {
	db *DB
}
type PlayerServiceQuery struct {
	Name *string `db:"name"`
	ID   *int64  `db:"id"`
}

func (ps *PlayerService) Query(query PlayerServiceQuery) ([]Player, error) {
	res := []Player{}
	sqlQuery := "SELECT id, name, guild FROM player"
	whereQuery := BuildWhereQuery(query)
	if whereQuery != "" {
		sqlQuery += " " + whereQuery
	}

	rows, err := ps.db.readConn.Query(sqlQuery)
	if err != nil {
		return res, fmt.Errorf("failed getting players for query %q: %v", sqlQuery, err)
	}
	defer rows.Close()

	for rows.Next() {
		player := Player{}
		err := rows.Scan(&player.ID, &player.Name, &player.Guild.ID)
		if err != nil {
			return res, fmt.Errorf("failed scanning player: %v", err)
		}
		res = append(res, player)
	}

	return res, nil
}

func (ps *PlayerService) Create(name string, guild Guild) (Player, error) {
	log.Printf("Creating player %s in guild %s", name, guild.Name)
	player := Player{}
	res, err := ps.db.writeConn.Exec("insert into player (name, guild) values (?, ?)", name, guild.ID)
	if err != nil {
		return player, fmt.Errorf("failed to insert player: %v", err)
	}

	id, err := res.LastInsertId()
	if err != nil {
		return player, fmt.Errorf("failed to get last insert id: %v", err)
	}
	log.Printf("Created player %s in guild %s with id %d", name, guild.Name, id)

	qres, err := ps.Query(PlayerServiceQuery{ID: &id})
	if err != nil {
		return player, fmt.Errorf("failed getting player for id %d: %v", id, err)
	}
	if len(qres) > 1 {
		return player, fmt.Errorf("more than one player found for id %d", id)
	}

	return qres[0], nil
}

func (ps *PlayerService) GetOrCreate(name string, guild Guild) (Player, error) {
	player := Player{}
	players, err := ps.Query(PlayerServiceQuery{Name: &name})
	if len(players) > 1 {
		return player, fmt.Errorf("more than one player found for name %s", name)
	}
	if err != nil || len(players) == 0 {
		player, err = ps.Create(name, guild)
		if err != nil {
			return player, fmt.Errorf("failed creating player: %v", err)
		}
	}
	if len(players) == 1 {
		player = players[0]
	}
	return player, nil
}