// NGnius 2020-02-12

package main

import (
	"encoding/json"
	"strconv"
)

type Jsonable interface {
	Json() ([]byte, error)
	JsonPretty() ([]byte, error)
	Unjson([]byte) error
	JsonObject() (interface{}, error)
}

type Rower interface {
	Intake() []interface{}
	Output() []interface{}
}

type Board struct {
	ID          int64
	Name        string
	Description string
}

func LoadBoard(id int64) *Board {
	b := &Board{ID: id}
	b.Load()
	return b
}

func (b *Board) Load() error {
	return db.QueryRow("SELECT * FROM Boards WHERE id=?", b.ID).Scan(b.Intake()...)
}

func (b *Board) Commit() error {
	tx, _ := db.Begin()
	statement, _ := tx.Prepare("INSERT OR REPLACE INTO Boards(id, name, description) VALUES (?, ?, ?);")
	_, err := statement.Exec(b.Output()...)
	if err != nil {
		tx.Rollback()
		return err
	}
	return tx.Commit()
}

func (b *Board) Entries() ([]*Entry, error) {
	var entries []*Entry
	rows, err := db.Query("SELECT * FROM Entries WHERE board=?", b.ID)
	if err != nil {
		return entries, err
	}
	count := 0
	for rows.Next() {
		entries = append(entries, &Entry{})
		rows.Scan(entries[count].Intake()...)
		count++
	}
	return entries, nil
}

func (b *Board) SomeEntries(start, end int64) ([]*Entry, error) {
	var entries []*Entry
	rows, err := db.Query("SELECT * FROM Entries WHERE board=? and rank >= ? and rank <= ? ORDER BY rank ASC;", b.ID, start, end)
	if err != nil {
		return entries, err
	}
	count := 0
	for rows.Next() {
		entries = append(entries, &Entry{})
		rows.Scan(entries[count].Intake()...)
		count++
	}
	return entries, nil
}

func (b *Board) Intake() []interface{} {
	return []interface{}{&b.ID, &b.Name, &b.Description}
}

func (b *Board) Output() []interface{} {
	return []interface{}{b.ID, b.Name, b.Description}
}

type Player struct {
	ID   int64
	Name string
}

func LoadPlayer(id int64) *Player {
	p := &Player{ID: id}
	p.Load()
	return p
}

func (p *Player) Load() error {
	return db.QueryRow("SELECT * FROM Players WHERE id=? LIMIT 1;", p.ID).Scan(p.Intake()...)
}

func (p *Player) Commit() error {
	tx, _ := db.Begin()
	statement, _ := tx.Prepare("INSERT OR REPLACE INTO Players(id, name) VALUES (?, ?);")
	_, err := statement.Exec(p.Output()...)
	if err != nil {
		tx.Rollback()
		return err
	}
	return tx.Commit()
}

func (p *Player) Entries() ([]*Entry, error) {
	var entries []*Entry
	rows, err := db.Query("SELECT * FROM Entries WHERE player=?", p.ID)
	if err != nil {
		return entries, err
	}
	count := 0
	for rows.Next() {
		entries = append(entries, &Entry{})
		rows.Scan(entries[count].Intake()...)
		count++
	}
	return entries, nil
}

func (p *Player) SomeEntries(limit int64) ([]*Entry, error) {
	var entries []*Entry
	rows, err := db.Query("SELECT * FROM Entries WHERE player=? ORDER BY rank ASC LIMIT ?;", p.ID, limit)
	if err != nil {
		return entries, err
	}
	count := 0
	for rows.Next() {
		entries = append(entries, &Entry{})
		rows.Scan(entries[count].Intake()...)
		count++
	}
	return entries, nil
}

func (p *Player) Url() string {
	return "/player/" + strconv.Itoa(int(p.ID))
}

// implementation of Rower
func (p *Player) Intake() []interface{} {
	return []interface{}{&p.ID, &p.Name}
}

func (p *Player) Output() []interface{} {
	return []interface{}{p.ID, p.Name}
}

type Entry struct {
	ID     int64
	Rank   int64
	Score  int64
	Player int64
	Board  int64
}

func LoadEntry(id int64) *Entry {
	e := &Entry{ID: id}
	e.Load()
	return e
}

func (e *Entry) Load() error {
	return db.QueryRow("SELECT * FROM Entries WHERE id=? LIMIT 1;", e.ID).Scan(e.Intake()...)
}

func (e *Entry) Commit() error {
	tx, _ := db.Begin()
	statement, _ := tx.Prepare("INSERT OR REPLACE INTO Entries(id, rank, score, player, board) VALUES (?, ?, ?, ?, ?);")
	_, err := statement.Exec(e.Output()...)
	if err != nil {
		tx.Rollback()
		return err
	}
	return tx.Commit()
}

// implementation of Jsonable
func (e *Entry) Json() ([]byte, error) {
	var data []byte
	jsonObj, err := e.JsonObject()
	if err != nil {
		return data, err
	}
	return json.Marshal(jsonObj)
}

func (e *Entry) JsonPretty() ([]byte, error) {
	var data []byte
	jsonObj, err := e.JsonObject()
	if err != nil {
		return data, err
	}
	return json.MarshalIndent(jsonObj, "", "  ")
}

func (e *Entry) JsonObject() (interface{}, error) {
	jsonObj := EntryJSON{ID: e.ID, Rank: e.Rank, Score: e.Score}
	ePlayer := &Player{ID: e.Player}
	err := ePlayer.Load()
	if err != nil {
		return jsonObj, err
	}
	jsonObj.PlayerName = ePlayer.Name
	jsonObj.PlayerURL = ePlayer.Url()
	return jsonObj, nil
}

// implementation of Rower
func (e *Entry) Intake() []interface{} {
	return []interface{}{&e.ID, &e.Rank, &e.Score, &e.Player, &e.Board}
}

func (e *Entry) Output() []interface{} {
	return []interface{}{e.ID, e.Rank, e.Score, e.Player, e.Board}
}