2 files changed, 151 insertions, 0 deletions
diff --git a/core/src/command/util/Command.kt b/core/src/command/util/Command.kt
new file mode 100644
index 0000000..734305a
--- /dev/null
+++ b/core/src/command/util/Command.kt
@@ -0,0 +1,17 @@
+package cat.freya.khs.command.util
+
+import cat.freya.khs.Khs
+import cat.freya.khs.player.Player
+
+interface CommandPart {
+    val label: String
+}
+
+interface Command : CommandPart {
+    val usage: List<String>
+    val description: String
+
+    fun execute(plugin: Khs, player: Player, args: List<String>)
+
+    fun autoComplete(plugin: Khs, parameter: String, typed: String): List<String>
+}
diff --git a/core/src/command/util/CommandGroup.kt b/core/src/command/util/CommandGroup.kt
new file mode 100644
index 0000000..72659d5
--- /dev/null
+++ b/core/src/command/util/CommandGroup.kt
@@ -0,0 +1,134 @@
+package cat.freya.khs.command.util
+
+import cat.freya.khs.Khs
+import cat.freya.khs.player.Player
+
+private data class CommandData(val command: Command, val permission: String, val args: List<String>)
+
+class CommandGroup(val plugin: Khs, override val label: String, vararg commands: CommandPart) :
+    CommandPart {
+    // set of commands to run in this group
+    private final val REGISTRY: Map<String, CommandPart> =
+        commands.associate { it.label.lowercase() to it }
+
+    private fun getCommand(args: List<String>, permission: String): CommandData? {
+        val invoke = args.firstOrNull()?.lowercase() ?: return null
+        val command = REGISTRY.get(invoke) ?: return null
+
+        return when (command) {
+            is Command -> CommandData(command, "$permission.$invoke", args.drop(1))
+            is CommandGroup -> command.getCommand(args.drop(1), "$permission.$invoke")
+            else -> null
+        }
+    }
+
+    private fun messageAbout(player: Player) {
+        val version = plugin.shim.pluginVersion
+        player.message(
+            "&b&lKenshin's Hide and Seek &7(&f$version&7)\n" +
+                "&7Author: &f[KenshinEto]\n" +
+                "&7Help Command: &b/hs &fhelp"
+        )
+    }
+
+    fun handleCommand(player: Player, args: List<String>) {
+        val data = getCommand(args, label) ?: return messageAbout(player)
+
+        if (plugin.saving) {
+            player.message(plugin.locale.prefix.error + plugin.locale.command.notAllowedTemp)
+            return
+        }
+
+        if (plugin.config.permissionsRequired && !player.hasPermission(data.permission)) {
+            player.message(plugin.locale.prefix.error + plugin.locale.command.notAllowed)
+            return
+        }
+
+        val paramCount = data.command.usage.filter { it.firstOrNull() != '*' }.count()
+        if (data.args.size < paramCount) {
+            player.message(plugin.locale.prefix.error + plugin.locale.command.notEnoughArguments)
+            return
+        }
+
+        runCatching { data.command.execute(plugin, player, data.args) }
+            .onFailure {
+                player.message(
+                    plugin.locale.prefix.error + (it.message ?: plugin.locale.command.unknownError)
+                )
+
+                if (plugin.config.debug) {
+                    plugin.shim.logger.warning("=== KHS BEGIN DEBUG TRACE ===")
+                    plugin.shim.logger.warning(it.stackTraceToString())
+                    plugin.shim.logger.warning("=== KHS END DEBUG TRACE ===")
+                }
+            }
+    }
+
+    private fun handleTabComplete(
+        player: Player,
+        args: List<String>,
+        permission: String,
+    ): List<String> {
+        val invoke = args.firstOrNull()?.lowercase() ?: return listOf()
+        val command = REGISTRY.get(invoke)
+        return when {
+            command is Command -> {
+                if (
+                    plugin.config.permissionsRequired &&
+                        !player.hasPermission("$permission.$invoke")
+                )
+                    return listOf()
+
+                var index = maxOf(args.size - 1, 1)
+                val typed = args.getOrNull(index) ?: return listOf()
+
+                // handle last argument of usage being a varadic (...)
+                if (
+                    index >= command.usage.size &&
+                        command.usage.lastOrNull()?.endsWith("...") == true
+                )
+                    index = command.usage.size
+
+                val parameter = command.usage.getOrNull(index - 1) ?: return listOf()
+
+                command.autoComplete(plugin, parameter, typed)
+            }
+            command is CommandGroup ->
+                command.handleTabComplete(player, args.drop(1), "$permission.$invoke")
+            args.size == 1 -> REGISTRY.keys.filter { it.startsWith(invoke) }
+            else -> listOf()
+        }
+    }
+
+    fun handleTabComplete(player: Player, args: List<String>): List<String> {
+        return handleTabComplete(player, args, label)
+    }
+
+    private fun commandsFor(
+        player: Player,
+        label: String,
+        permission: String,
+        res: MutableList<Pair<String, Command>>,
+    ) {
+        for ((invoke, command) in REGISTRY) {
+            when (command) {
+                is Command -> {
+                    if (
+                        plugin.config.permissionsRequired &&
+                            !player.hasPermission("$permission.$invoke")
+                    )
+                        continue
+                    res.add("$label $invoke" to command)
+                }
+                is CommandGroup ->
+                    command.commandsFor(player, "$label $invoke", "$permission.$invoke", res)
+            }
+        }
+    }
+
+    fun commandsFor(player: Player): List<Pair<String, Command>> {
+        val commands = mutableListOf<Pair<String, Command>>()
+        commandsFor(player, label, label, commands)
+        return commands
+    }
+}