package data

import (
	"encoding/json"
	"fmt"
	"net/url"
	"os"
	"sync"
)

var sessionMu sync.RWMutex

func ReadSessionData() (Session, error) {
	var session Session

	sessionMu.RLock()
	data, err := os.ReadFile("players.json")
	sessionMu.RUnlock()

	if err != nil {
		return session, err
	}
	err = json.Unmarshal(data, &session)

	if err == nil {
		for i, p := range session.Players {
			session.Players[i].ToggleUrl = "/sessioninfo?playerName=" + url.QueryEscape(p.Name) + "&playerAttending=toggle"
		}
	}

	return session, err
}

func PersistSession(session Session) error {
	jsonData, err := json.MarshalIndent(session, "", "  ")
	if err != nil {
		return err
	}

	sessionMu.Lock()
	err = os.WriteFile("players.json", jsonData, 0644)
	sessionMu.Unlock()
	return err
}

func AddPlayer(session Session, p Player) error {
	session.Players = append(session.Players, p)
	return PersistSession(session)
}

func DeletePlayer(session Session, name string) error {
	players := make([]Player, 0, len(session.Players))
	for _, p := range session.Players {
		if p.Name != name {
			players = append(players, p)
		}
	}
	session.Players = players
	return PersistSession(session)
}

func UpdatePlayer(session Session, originalName string, updated Player) error {
	for i, p := range session.Players {
		if p.Name == originalName {
			session.Players[i] = updated
			return PersistSession(session)
		}
	}
	return fmt.Errorf("player %q not found", originalName)
}