package com.earth2me.essentials.perm;

import org.bukkit.Bukkit;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.server.ServiceRegisterEvent;
import org.bukkit.plugin.Plugin;
import org.tyrannyofheaven.bukkit.zPermissions.ZPermissionsService;

import java.util.ArrayList;
import java.util.List;
import java.util.Set;
import java.util.UUID;


public class ZPermissionsHandler extends SuperpermsHandler implements Listener {
    private ZPermissionsService service = null;
    private boolean hasGetPlayerPrimaryGroup = false; // This is a post-1.0 addition

    public ZPermissionsHandler(Plugin plugin) {
        acquireZPermissionsService();
        if (!isReady()) {
            // Shouldn't get to this point, since caller checks if zPerms
            // is enabled. But for the sake of correctness...
            Bukkit.getPluginManager().registerEvents(this, plugin);
        }
    }

    @EventHandler
    public void onServiceRegister(ServiceRegisterEvent event) {
        if (ZPermissionsService.class.equals(event.getProvider().getService())) {
            acquireZPermissionsService();
        }
    }

    @Override
    public String getGroup(Player base) {
        if (!isReady()) {
            return super.getGroup(base);
        } else {
            return getPrimaryGroup(base.getUniqueId());
        }
    }

    @Override
    public List<String> getGroups(Player base) {
        if (!isReady()) {
            return super.getGroups(base);
        } else {
            return new ArrayList<String>(service.getPlayerGroups(base.getUniqueId()));
        }
    }

    @Override
    public boolean inGroup(Player base, String group) {
        if (!isReady()) {
            return super.inGroup(base, group);
        } else {
            Set<String> groups = service.getPlayerGroups(base.getUniqueId());
            for (String test : groups) {
                if (test.equalsIgnoreCase(group)) {
                    return true;
                }
            }
            return false;
        }
    }

    @Override
    public String getPrefix(Player base) {
        if (!isReady()) {
            return super.getPrefix(base);
        } else {
            return getPrefixSuffix(base, "prefix");
        }
    }

    @Override
    public String getSuffix(Player base) {
        if (!isReady()) {
            return super.getSuffix(base);
        } else {
            return getPrefixSuffix(base, "suffix");
        }
    }

    private String getPrefixSuffix(Player base, String metadataName) {
        String playerPrefixSuffix;
        try {
            playerPrefixSuffix = service.getPlayerMetadata(base.getUniqueId(), metadataName, String.class);
        } catch (IllegalStateException e) {
            // User error. They set prefix to a non-string.
            playerPrefixSuffix = null;
        }
        if (playerPrefixSuffix == null) {
            // Try prefix/suffix of their "primary group"
            try {
                return service.getGroupMetadata(getPrimaryGroup(base.getUniqueId()), metadataName, String.class);
            } catch (IllegalStateException e) {
                // User error, again
                return null;
            }
        } else {
            return playerPrefixSuffix;
        }
    }

    private void acquireZPermissionsService() {
        service = Bukkit.getServicesManager().load(ZPermissionsService.class);
        if (isReady()) {
            // getPlayerPrimaryGroup(String) was added in an unreleased version
            // Check if it exists.
            try {
                service.getClass().getMethod("getPlayerPrimaryGroup", String.class);
                hasGetPlayerPrimaryGroup = true;
            } catch (NoSuchMethodException e) {
                hasGetPlayerPrimaryGroup = false;
            } catch (SecurityException e) {
                hasGetPlayerPrimaryGroup = false;
            }
        }
    }

    private boolean isReady() {
        return service != null;
    }

    private String getPrimaryGroup(UUID playerId) {
        if (hasGetPlayerPrimaryGroup) {
            return service.getPlayerPrimaryGroup(playerId);
        } else {
            // Fall back to using highest-weight assigned group
            List<String> groups = service.getPlayerAssignedGroups(playerId);
            return groups.get(0);
        }
    }
}