package me.viper.teamplugin.manager;

import me.viper.teamplugin.Main;
import me.viper.teamplugin.util.Utils;
import org.bukkit.configuration.file.FileConfiguration;
import org.bukkit.configuration.file.YamlConfiguration;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

/**
 * Writes and reads audit entries in log.yml.
 *
 * Entry format:
 *   2026-03-08T12:00:00Z | ADD | by:AdminName | Steve → Owner
 *
 * Supported action strings (use the constants below for consistency):
 *   ADD, REMOVE, MOVE, APPLY_ACCEPT, APPLY_DENY
 */
public class AuditLog {

    public static final String ADD           = "ADD";
    public static final String REMOVE        = "REMOVE";
    public static final String MOVE          = "MOVE";
    public static final String APPLY_ACCEPT  = "APPLY_ACCEPT";
    public static final String APPLY_DENY    = "APPLY_DENY";

    private static File file;
    private static FileConfiguration cfg;

    // ── File management ───────────────────────────────────────────────

    private static void ensureLoaded() {
        if (cfg != null) return;
        file = new File(Main.getInstance().getDataFolder(), "log.yml");
        try { if (!file.exists()) file.createNewFile(); }
        catch (IOException e) { e.printStackTrace(); }
        cfg = YamlConfiguration.loadConfiguration(file);
    }

    private static void save() {
        try { if (cfg != null && file != null) cfg.save(file); }
        catch (IOException e) { e.printStackTrace(); }
    }

    public static void reload() { cfg = null; }

    // ── API ───────────────────────────────────────────────────────────

    /**
     * Appends an audit entry.
     *
     * @param action      one of the constants above, e.g. AuditLog.ADD
     * @param performedBy name of the command sender (player or "CONSOLE")
     * @param detail      human-readable summary, e.g. "Steve → Owner"
     */
    public static void log(String action, String performedBy, String detail) {
        ensureLoaded();
        String entry = Utils.formatIsoNow()
                + " | " + action
                + " | by:" + performedBy
                + " | " + detail;

        List<String> entries = new ArrayList<>(cfg.getStringList("entries"));
        entries.add(entry);

        int max = Main.getInstance().getConfig().getInt("audit.keep", 500);
        if (entries.size() > max) entries = entries.subList(entries.size() - max, entries.size());

        cfg.set("entries", entries);
        save();
    }

    /**
     * Returns the last {@code limit} entries, most recent last.
     */
    public static List<String> getEntries(int limit) {
        ensureLoaded();
        List<String> all = cfg.getStringList("entries");
        int from = Math.max(0, all.size() - limit);
        return new ArrayList<>(all.subList(from, all.size()));
    }
}