using System;

using Server.Accounting;
using Server.Commands;
using Server.Mobiles;

namespace Server.Custom.Bridge
{
    /// <summary>
    ///     Forwards IN-GAME uses of the write-plane verbs to the website as admin.audit
    ///     (origin=in-game), so the site's moderation log is complete regardless of whether an action
    ///     came from the website or a staff member in the game client. See docs/ADMIN_CONTROLS.md §5.5.
    ///
    ///     Two sources, mirroring how the shard records each:
    ///       - ban / kick: resolved with their target inside the stock generic command, which logs a
    ///         line via CommandLogging.WriteLine. We tap the new CommandLogging.OnWrite event and
    ///         parse the "... banning|kicking &lt;target&gt; ('acct')" line for action and target.
    ///       - broadcast: [bcast carries its message as command args and hits no target, so
    ///         EventSink.Command already sees it whole; we reshape it.
    ///
    ///     Not in overlay/: it references CommandLogging.OnWrite, which exists only after
    ///     patches/commandlogging-event.patch is applied. Shipping it in overlay/ would break the
    ///     build on an unpatched install — the same reason BridgeVendorSale.cs lives in patches/.
    ///
    ///     Runs on the Core thread (both sources raise synchronously in the command path). Every body
    ///     is wrapped: a bridge exception must never escape into a staff command.
    /// </summary>
    public static class BridgeModerationAudit
    {
        public static void Initialize()
        {
            if (!BridgeConfig.Enabled)
                return;

            CommandLogging.OnWrite += OnCommandLog; // ban / kick (resolved, with target)
            EventSink.Command += OnStaffCommand;    // broadcast (carries its message)

            Console.WriteLine("[Bridge] in-game moderation audit attached");
        }

        /// <summary>
        ///     The stock ban/kick commands log "&lt;level&gt; &lt;from&gt; ('acct') banning|kicking
        ///     &lt;target&gt; ('acct')" (Commands.cs KickCommand). Match the verb, take the target's
        ///     account from the trailing "('acct')", and forward. Non-moderation lines are ignored.
        /// </summary>
        private static void OnCommandLog(Mobile from, string text)
        {
            try
            {
                if (from == null || text == null)
                    return;

                string action;
                int at;

                if ((at = text.IndexOf(" banning ", StringComparison.Ordinal)) >= 0)
                    action = "ban";
                else if ((at = text.IndexOf(" kicking ", StringComparison.Ordinal)) >= 0)
                    action = "kick";
                else
                    return;

                var tail = text.Substring(at + 9); // past " banning " / " kicking "
                Emit(action, from, ExtractAccount(tail), text);
            }
            catch (Exception ex)
            {
                Console.WriteLine("[Bridge] mod-audit log parse threw: {0}", ex.Message);
            }
        }

        /// <summary>[bcast / [bc / [b — a staff broadcast. Its message is the command args.</summary>
        private static void OnStaffCommand(CommandEventArgs e)
        {
            try
            {
                if (e == null || e.Mobile == null || e.Mobile.AccessLevel <= AccessLevel.Player)
                    return;

                var cmd = e.Command;
                if (cmd == null)
                    return;

                cmd = cmd.ToLowerInvariant();
                if (cmd != "bcast" && cmd != "bc" && cmd != "b")
                    return;

                Emit("broadcast", e.Mobile, null, e.ArgString);
            }
            catch (Exception ex)
            {
                Console.WriteLine("[Bridge] mod-audit command threw: {0}", ex.Message);
            }
        }

        /// <summary>Pulls the account from a CommandLogging.Format rendering's trailing "('account')".</summary>
        private static string ExtractAccount(string formatted)
        {
            if (formatted == null)
                return null;

            int open = formatted.LastIndexOf("('", StringComparison.Ordinal);
            if (open < 0)
                return null;

            int close = formatted.IndexOf("')", open, StringComparison.Ordinal);
            if (close < 0)
                return null;

            return formatted.Substring(open + 2, close - (open + 2));
        }

        /// <summary>
        ///     Emits admin.audit with origin=in-game. The actor is the staff member's account name
        ///     (no "web:" prefix — that, plus the origin field, is how the website tells the two
        ///     sources apart). `detail` carries the raw context so nothing is lost if a target could
        ///     not be parsed.
        /// </summary>
        private static void Emit(string action, Mobile actor, string target, string detail)
        {
            var acct = actor.Account as Account;
            var actorName = acct != null ? acct.Username : actor.Name;

            BridgeLink.Emit(BridgeJson.Begin("admin.audit")
                .Str("origin", "in-game")
                .Str("action", action)
                .Str("actor", actorName)
                .Str("target", target)
                .Str("detail", detail)
                .End());
        }
    }
}