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
}

type (
	FullPlayer struct {
		ID    int64  `json:"id"`
		Name  string `json:"name"`
		Guild struct {
			ID   int64  `json:"id"`
			Name string `json:"name"`
		} `json:"guild"`
		Associations []FullPlayerAssociation `json:"associations"`
		Notes        []FullPlayerNote        `json:"notes"`
	}

	FullPlayerAssociation struct {
		ID   int64  `json:"id"`
		Name string `json:"name"`
		Note string `json:"note"`
	}

	FullPlayerNote struct {
		ID        int64  `json:"id"`
		Content   string `json:"content"`
		Timestamp string `json:"timestamp"`
	}
)

func (ps *PlayerService) GetAllPlayerInfo(name string, nnotes int) (FullPlayer, error) {
	res := FullPlayer{}

	err := ps.db.readConn.QueryRow(selectPlayer, name).Scan(&res.ID, &res.Name, &res.Guild.ID, &res.Guild.Name)
	if err != nil {
		return res, fmt.Errorf("failed getting player info: %v", err)
	}

	rows, err := ps.db.readConn.Query(selectAssociation, res.ID)
	if err != nil {
		return res, fmt.Errorf("failed getting player associations: %v", err)
	}

	for rows.Next() {
		assoc := FullPlayerAssociation{}
		err := rows.Scan(&assoc.ID, &assoc.Name, &assoc.Note)
		if err != nil {
			return res, fmt.Errorf("failed scanning association: %v", err)
		}
		res.Associations = append(res.Associations, assoc)
	}
	rows.Close()

	rows, err = ps.db.readConn.Query(selectNotes, res.ID, nnotes)
	if err != nil {
		return res, fmt.Errorf("failed getting player notes: %v", err)
	}

	for rows.Next() {
		note := FullPlayerNote{}
		err := rows.Scan(&note.ID, &note.Content, &note.Timestamp)
		if err != nil {
			return res, fmt.Errorf("failed scanning note: %v", err)
		}
		res.Notes = append(res.Notes, note)
	}
	rows.Close()

	return res, nil
}

func (ps *PlayerService) GetAllPlayers() ([]Player, error) {
	res := []Player{}

	rows, err := ps.db.readConn.Query(selectPlayers)
	if err != nil {
		return res, fmt.Errorf("failed getting players: %v", err)
	}

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

	return res, nil
}