using System;

namespace Server.Custom.Bridge
{
    /// <summary>
    ///     Which side may mint game accounts. Governs the bridge's inbound account.create verb;
    ///     the in-game first-login auto-create is a separate core setting (Accounts.AutoCreateAccounts)
    ///     the operator pairs with this (https://gitea.whitlocktech.com/RunicGateway/docs/src/branch/main/link/PROTOCOL_2.md §2).
    /// </summary>
    public enum SignupMode
    {
        Website, // website is the account authority; in-game auto-create should be off
        Game,    // game server is the authority; account.create is refused
        Hybrid   // either side may create
    }

    /// <summary>
    ///     Tunables from Config/Bridge.cfg. Key scope is the filename, so `Port=7788` there
    ///     reads as "Bridge.Port" here.
    ///
    ///     Loaded in Configure(), which ScriptCompiler invokes before World.Load.
    /// </summary>
    public static class BridgeConfig
    {
        public static string Host { get; private set; }
        public static int Port { get; private set; }
        public static int QueueCap { get; private set; }

        public static int StatSweepSeconds { get; private set; }
        public static int DecaySweepSeconds { get; private set; }
        public static int EconomySweepSeconds { get; private set; }
        public static int PageSweepSeconds { get; private set; }
        public static int ChampSweepSeconds { get; private set; }
        public static int GuildSweepSeconds { get; private set; }
        public static int CitySweepSeconds { get; private set; }
        public static int PresenceSweepSeconds { get; private set; }
        public static int HousingSweepSeconds { get; private set; }
        public static int PointsSweepSeconds { get; private set; }
        public static int MarketSweepSeconds { get; private set; }

        // ---- player-vendor market index (https://gitea.whitlocktech.com/RunicGateway/docs/src/branch/main/link/v3.md §8) ----
        public static bool MarketEnabled { get; private set; }
        public static int MarketSweepBatch { get; private set; }
        public static int MarketMaxListings { get; private set; }

        // ---- points / loyalty leaderboards (https://gitea.whitlocktech.com/RunicGateway/docs/src/branch/main/link/v3.md §7) ----
        public static bool PointsLeaderboardEnabled { get; private set; }
        public static int PointsTopN { get; private set; }
        public static string PointsSystems { get; private set; }
        public static bool PointsProfileEnabled { get; private set; }
        public static bool PointsProfileRank { get; private set; }

        // ---- shard ruleset (https://gitea.whitlocktech.com/RunicGateway/docs/src/branch/main/link/v3.md §5) ----
        public static bool RulesetEnabled { get; private set; }
        public static string PublicConnectAddress { get; private set; }
        public static bool RulesetIncludeSchedule { get; private set; }

        public static string LinkUrl { get; private set; }

        public static int TownCrierMaxLines { get; private set; }
        public static int TownCrierMaxLineLength { get; private set; }
        public static int TownCrierMaxActive { get; private set; }
        public static int TownCrierMaxDurationSec { get; private set; }

        // Town Cryer news gump (https://gitea.whitlocktech.com/RunicGateway/docs/src/branch/main/link/PROTOCOL_2.md §16).
        public static int NewsMaxTitleLength { get; private set; }
        public static int NewsMaxBodyLength { get; private set; }
        public static int NewsMaxExternal { get; private set; }
        public static int NewsAnnounceDurationSec { get; private set; }

        public static bool AdminWriteEnabled { get; private set; }
        public static AccessLevel AdminAccessFloor { get; private set; }
        public static int AdminBroadcastMaxLength { get; private set; }
        public static int AdminReasonMaxLength { get; private set; }
        public static int AdminBanMaxDurationSec { get; private set; }

        // ---- account provisioning (https://gitea.whitlocktech.com/RunicGateway/docs/src/branch/main/link/PROTOCOL_2.md Part A) ----
        public static SignupMode Signup { get; private set; }
        public static bool AccountCreateEnabled { get; private set; }
        public static bool RequireIpForCreate { get; private set; }
        public static int AccountNameMaxLength { get; private set; }
        public static int AccountPasswordMaxLength { get; private set; }

        public static bool Enabled { get; private set; }

        public static void Configure()
        {
            Load();
        }

        /// <summary>Re-readable at runtime via `[bridge reload`.</summary>
        public static void Load()
        {
            Enabled = Config.Get("Bridge.Enabled", true);

            Host = Config.Get("Bridge.Host", "127.0.0.1");
            Port = Config.Get("Bridge.Port", 7788);
            QueueCap = Config.Get("Bridge.QueueCap", 10000);

            StatSweepSeconds = Config.Get("Bridge.StatSweepSeconds", 30);
            DecaySweepSeconds = Config.Get("Bridge.DecaySweepSeconds", 60);
            EconomySweepSeconds = Config.Get("Bridge.EconomySweepSeconds", 300);
            PageSweepSeconds = Config.Get("Bridge.PageSweepSeconds", 5);
            if (PageSweepSeconds < 1)
                PageSweepSeconds = 1;

            ChampSweepSeconds = Config.Get("Bridge.ChampSweepSeconds", 10);
            if (ChampSweepSeconds < 1)
                ChampSweepSeconds = 1;

            // Social/political sweeps (https://gitea.whitlocktech.com/RunicGateway/docs/src/branch/main/link/PROTOCOL_2.md Part B). Both change slowly, so the
            // defaults are unhurried; the pass is a handful of field reads over a small set.
            GuildSweepSeconds = Config.Get("Bridge.GuildSweepSeconds", 60);
            if (GuildSweepSeconds < 1)
                GuildSweepSeconds = 1;

            CitySweepSeconds = Config.Get("Bridge.CitySweepSeconds", 300);
            if (CitySweepSeconds < 1)
                CitySweepSeconds = 1;

            PresenceSweepSeconds = Config.Get("Bridge.PresenceSweepSeconds", 30);
            if (PresenceSweepSeconds < 1)
                PresenceSweepSeconds = 1;

            HousingSweepSeconds = Config.Get("Bridge.HousingSweepSeconds", 300);
            if (HousingSweepSeconds < 1)
                HousingSweepSeconds = 1;

            // Points/loyalty boards. The sweep touches every point entry on the shard, and ten of
            // the ~25 systems keep a row per character ever created, so the default interval is
            // deliberately slow — these are month-scale standings, not live state.
            PointsSweepSeconds = Config.Get("Bridge.PointsSweepSeconds", 300);
            if (PointsSweepSeconds < 1)
                PointsSweepSeconds = 1;

            PointsLeaderboardEnabled = Config.Get("Bridge.PointsLeaderboardEnabled", true);

            // Board size. Bounded below at 1 because the selection indexes the Nth slot directly,
            // and above at 100 because the frame is emitted per system — a large N multiplied by
            // ~25 systems is how a "board" turns into a bandwidth problem.
            PointsTopN = Config.Get("Bridge.PointsTopN", 10);
            if (PointsTopN < 1)
                PointsTopN = 1;
            if (PointsTopN > 100)
                PointsTopN = 100;

            // Blank (the default) means "publish whatever the shard itself shows on the loyalty
            // gump", so a shard that adds a subsystem gets its board without an edit here.
            PointsSystems = Config.Get("Bridge.PointsSystems", "");

            PointsProfileEnabled = Config.Get("Bridge.PointsProfileEnabled", true);

            // Off by default, and the default is the point: a rank cannot early-exit the way a
            // points lookup can — it must count every row that beats the player, in every system,
            // on every profile build. See BridgeProfile.WritePoints.
            PointsProfileRank = Config.Get("Bridge.PointsProfileRank", false);

            // Player-vendor market index. Unlike every other sweep, this one does NOT walk its whole
            // collection per tick: MarketSweepBatch caps how many vendors are inventoried, and a
            // persistent cursor round-robins through the rest, so the per-tick cost is bounded by
            // the batch rather than by how many vendors the world holds.
            MarketEnabled = Config.Get("Bridge.MarketEnabled", true);

            MarketSweepSeconds = Config.Get("Bridge.MarketSweepSeconds", 60);
            if (MarketSweepSeconds < 1)
                MarketSweepSeconds = 1;

            // Bounded below at 1 (a batch of 0 would advance the cursor nowhere and publish nothing,
            // silently) and above at 500, past which the batch stops bounding anything on any
            // realistic shard and the tick is a whole-world pass by another name.
            MarketSweepBatch = Config.Get("Bridge.MarketSweepBatch", 25);
            if (MarketSweepBatch < 1)
                MarketSweepBatch = 1;
            if (MarketSweepBatch > 500)
                MarketSweepBatch = 500;

            // Per-vendor listing cap. BridgeJson.Parse caps INBOUND frames at 1 MB; outbound is
            // uncapped and the sidecar's read_line will allocate whatever arrives, so the cap here
            // is what keeps one commodity reseller with 8,000 stacked resources from emitting a
            // multi-megabyte frame. Over the cap the frame carries "truncated": true and the site
            // says so.
            MarketMaxListings = Config.Get("Bridge.MarketMaxListings", 250);
            if (MarketMaxListings < 1)
                MarketMaxListings = 1;
            if (MarketMaxListings > 5000)
                MarketMaxListings = 5000;

            // The ruleset frame is not a sweep — it is emitted once per sidecar connect (and on
            // `[bridge reload`), so it has no interval. PublicConnectAddress is the ONE connection
            // detail the bridge will publish, and only because an operator typed it here for that
            // purpose; Server.cfg's Address/Port are never read (see BridgeRuleset's allowlist note).
            RulesetEnabled = Config.Get("Bridge.RulesetEnabled", true);
            PublicConnectAddress = Config.Get("Bridge.PublicConnectAddress", "");
            RulesetIncludeSchedule = Config.Get("Bridge.RulesetIncludeSchedule", true);

            LinkUrl = Config.Get("Bridge.LinkUrl", "https://yoursite/link");

            TownCrierMaxLines = Config.Get("Bridge.TownCrierMaxLines", 6);
            TownCrierMaxLineLength = Config.Get("Bridge.TownCrierMaxLineLength", 200);
            TownCrierMaxActive = Config.Get("Bridge.TownCrierMaxActive", 20);
            TownCrierMaxDurationSec = Config.Get("Bridge.TownCrierMaxDurationSec", 86400);

            NewsMaxTitleLength = Config.Get("Bridge.NewsMaxTitleLength", 100);
            NewsMaxBodyLength = Config.Get("Bridge.NewsMaxBodyLength", 2000);
            NewsMaxExternal = Config.Get("Bridge.NewsMaxExternal", 20);
            NewsAnnounceDurationSec = Config.Get("Bridge.NewsAnnounceDurationSec", 300);
            if (NewsAnnounceDurationSec < 1)
                NewsAnnounceDurationSec = 1;

            AdminWriteEnabled = Config.Get("Bridge.AdminWriteEnabled", false);
            AdminAccessFloor = ParseAccessLevel(Config.Get("Bridge.AdminAccessFloor", "CoOwner"), AccessLevel.CoOwner);
            AdminBroadcastMaxLength = Config.Get("Bridge.AdminBroadcastMaxLength", 300);
            AdminReasonMaxLength = Config.Get("Bridge.AdminReasonMaxLength", 400);
            AdminBanMaxDurationSec = Config.Get("Bridge.AdminBanMaxDurationSec", 31536000);

            // Account provisioning. An absent SignupMode defaults to Hybrid; a *present but
            // unrecognized* value falls back to Game (the safest — no website creation), so a
            // typo can never accidentally open provisioning.
            Signup = ParseSignupMode(Config.Get("Bridge.SignupMode", "hybrid"), SignupMode.Game);
            // Default follows the mode: creation is on unless the shard is game-authority.
            AccountCreateEnabled = Config.Get("Bridge.AccountCreateEnabled", Signup != SignupMode.Game);
            RequireIpForCreate = Config.Get("Bridge.RequireIpForCreate", true);
            AccountNameMaxLength = Config.Get("Bridge.AccountNameMaxLength", 16);
            AccountPasswordMaxLength = Config.Get("Bridge.AccountPasswordMaxLength", 30);
            if (AccountNameMaxLength < 1)
                AccountNameMaxLength = 1;
            if (AccountPasswordMaxLength < 1)
                AccountPasswordMaxLength = 1;

            if (QueueCap < 16)
                QueueCap = 16;

            WarnOnSignupMismatch();
        }

        /// <summary>
        ///     The bridge governs only the account.create verb; ServUO's in-game first-login
        ///     auto-create is the core Accounts.AutoCreateAccounts setting. A shard whose two halves
        ///     disagree is quietly broken (website-only that still auto-creates in game, or a mode
        ///     that expects in-game creation with it switched off), so surface the contradiction
        ///     loudly rather than silently doing the permissive thing.
        /// </summary>
        private static void WarnOnSignupMismatch()
        {
            var autoCreate = Config.Get("Accounts.AutoCreateAccounts", true);

            if (Signup == SignupMode.Website && autoCreate)
                Console.WriteLine(
                    "[Bridge] WARNING: SignupMode=website but Accounts.AutoCreateAccounts=true; "
                    + "an in-game login of any new name still mints an account. Set it false for website-only.");
            else if (Signup == SignupMode.Game && !autoCreate)
                Console.WriteLine(
                    "[Bridge] WARNING: SignupMode=game but Accounts.AutoCreateAccounts=false; "
                    + "in-game creation is off and account.create is refused, so no account can be created.");
            else if (Signup == SignupMode.Hybrid && !autoCreate)
                Console.WriteLine(
                    "[Bridge] WARNING: SignupMode=hybrid but Accounts.AutoCreateAccounts=false; "
                    + "in-game first-login creation is off. Only website account.create will work.");
        }

        /// <summary>
        ///     Parses a SignupMode name, case-insensitively, falling back to <paramref name="fallback"/>
        ///     on anything unrecognized so a typo can never open provisioning wider than intended.
        /// </summary>
        private static SignupMode ParseSignupMode(string value, SignupMode fallback)
        {
            SignupMode parsed;
            if (!String.IsNullOrEmpty(value) && Enum.TryParse(value.Trim(), true, out parsed) &&
                Enum.IsDefined(typeof(SignupMode), parsed))
                return parsed;

            Console.WriteLine("[Bridge] unrecognized SignupMode '{0}', using {1}", value, fallback);
            return fallback;
        }

        /// <summary>
        ///     Parses an AccessLevel name from config, case-insensitively, falling back to the given
        ///     default on anything unrecognized so a typo can never open the floor wider than intended.
        /// </summary>
        private static AccessLevel ParseAccessLevel(string value, AccessLevel fallback)
        {
            AccessLevel parsed;
            if (!String.IsNullOrEmpty(value) && Enum.TryParse(value.Trim(), true, out parsed) &&
                Enum.IsDefined(typeof(AccessLevel), parsed))
                return parsed;

            Console.WriteLine("[Bridge] unrecognized AdminAccessFloor '{0}', using {1}", value, fallback);
            return fallback;
        }

        public static string Describe()
        {
            return String.Format(
                "enabled={0} endpoint={1}:{2} queueCap={3} sweeps(stat={4}s decay={5}s econ={6}s champ={7}s) adminWrite={8}(floor={9}) signup={10}(create={11})",
                Enabled, Host, Port, QueueCap, StatSweepSeconds, DecaySweepSeconds, EconomySweepSeconds,
                ChampSweepSeconds, AdminWriteEnabled, AdminAccessFloor, Signup, AccountCreateEnabled);
        }
    }
}