using CounterStrikeSharp.API;
using CounterStrikeSharp.API.Core;
using CounterStrikeSharp.API.Modules.Menu;
using CounterStrikeSharp.API.Modules.Utils;
using Outnumbered.Data;
using Outnumbered.Domain;

namespace Outnumbered;

// XP -> levels -> points -> prestige, plus the !skills menu that spends points. The XP/level/prestige CURVES
// live in Outnumbered.Domain.ProgressionModel; these are zero-math accessors. The stateful level-up loop + its side
// effects (chat/sound/clan) stay engine-side below.
public sealed partial class OutnumberedPlugin
{
    private long XpToNext(int level) => ProgressionModel.XpToNext(level, Config.Progression);

    private double PrestigeXpMultiplier(PlayerData pd) => ProgressionModel.PrestigeXpMultiplier(pd.Prestige, Config.Progression);

    // Award XP (per-hit damage, kill bonus, or dev). Applies the XP-Boost stat + cumulative prestige boost +
    // handicap rate; handles level-ups. The fractional remainder is carried so tiny per-hit grants aren't lost.
    private void GrantXp(PlayerData pd, double baseAmount, CCSPlayerController? p)
    {
        if (baseAmount <= 0 || pd.Level >= Config.Progression.LevelCap) return;

        double scaled = baseAmount
            * (1.0 + Eff(pd, StatKeys.XpBoost) / 100.0)
            * PrestigeXpMultiplier(pd)
            * HandicapXpMult(pd)
            + pd.XpCarry;
        long gain = (long)Math.Floor(scaled);
        pd.XpCarry = scaled - gain; // keep the sub-1 remainder for the next hit
        if (gain <= 0) return;

        pd.Xp += gain;
        pd.Dirty = true;
        ApplyXpToLevel(pd, p);
    }

    // Resolve any pending level-ups from pd.Xp (awarding a point + firing the level-up cascade each), then clamp at
    // the cap. Shared by per-hit XP (GrantXp) and the survival per-wave grant (AddConvertedXp) so both behave alike.
    private void ApplyXpToLevel(PlayerData pd, CCSPlayerController? p)
    {
        long need;
        while (pd.Level < Config.Progression.LevelCap && pd.Xp >= (need = XpToNext(pd.Level)))
        {
            pd.Xp -= need; // same XpToNext(pd.Level) the condition just computed (pd.Level unchanged until ++ below)
            pd.Level++;
            pd.Points++;
            OnLevelUp(pd, p);
        }
        if (pd.Level >= Config.Progression.LevelCap) { pd.Xp = 0; pd.XpCarry = 0; } // clamp at cap
    }

    // Route combat XP. In survival it's banked RAW into the CURRENT wave's accumulator (granted at wave clear x prestige
    // x waveMult; the handicap XP-mult is deliberately excluded there). In every other mode it grants now.
    internal void GrantCombatXp(PlayerData pd, double baseAmount, CCSPlayerController? p)
    {
        if (Draft is { } d) d.AccumulateWaveXp(pd, baseAmount); // survival: banked raw into THIS wave's accumulator
        else GrantXp(pd, baseAmount, p);
    }

    // Add a pre-computed XP lump straight to the main table and resolve level-ups — NO per-hit multipliers re-applied
    // (the survival per-wave grant has already applied prestige x waveMult and deliberately excluded the handicap mult).
    internal void AddConvertedXp(PlayerData pd, long lump, CCSPlayerController? p)
    {
        if (lump <= 0 || pd.Level >= Config.Progression.LevelCap) return;
        pd.Xp += lump;
        pd.Dirty = true;
        ApplyXpToLevel(pd, p);
    }

    private void OnLevelUp(PlayerData pd, CCSPlayerController? p)
    {
        if (p is not { IsValid: true }) return;
        if (pd.Level >= Config.Progression.LevelCap)
            p.PrintToChat($"[Outnumbered] MAX LEVEL! Type !prestige to reset for a permanent boost.");
        else
            p.PrintToChat($"[Outnumbered] Level {pd.Level}! +1 point — !skills to spend ({pd.Points} available).");
        ApplyClan(p, pd); // rank tag may have changed
        PlaySound(p, Config.Sounds.LevelUp);
        AnnounceUnlocks(p, pd.Level); // shout any weapon(s) that unlock at this exact level
    }

    // Flat kill bonus on the lethal blow (the bulk of XP comes per-hit from damage; see OnPlayerHurt_Stats).
    private void GrantKillXp(CCSPlayerController attacker)
    {
        if (PdOf(attacker) is { } pd)
            GrantCombatXp(pd, Config.Progression.KillXpBonus, attacker); // survival: into the run accumulator
    }

    // ---- !skills ----
    // Flat numbered legend (no menu): buy any stat directly with !s<n>, repeatable, no pagination.
    // (!1-!9 are reserved by CSSharp's menu key system, so skill commands use the 's' prefix.)
    private void OpenSkillMenu(CCSPlayerController p)
    {
        var pd = PdOf(p);
        if (pd is null) return;

        p.PrintToChat($" {ChatColors.Gold}[Outnumbered] Skills — {pd.Points} pt | L{pd.Level} P {Roman(pd.Prestige)}  (buy: !s1-!s{StatList.Length})");
        for (int i = 0; i < StatList.Length; i++)
            p.PrintToChat($" {ChatColors.Lime}  " + SkillLegendSeg(pd, i));
    }

    private string SkillLegendSeg(PlayerData pd, int i)
    {
        var (key, display) = StatList[i];
        return $"!s{i + 1} {display} [{LevelOf(pd, key)}/{DefFor(key).MaxLevel}]";
    }

    // Registered from Load: !s1..!sN each buy the matching stat (BuyStat enforces points/cap).
    private void RegisterSkillCommands()
    {
        for (int i = 0; i < StatList.Length; i++)
        {
            int idx = i;
            AddCommand($"css_s{i + 1}", $"Buy skill #{i + 1}", (player, _) =>
            {
                if (player is { IsValid: true }) BuyStat(player, StatList[idx].Key);
            });
        }
    }

    private void BuyStat(CCSPlayerController p, string key)
    {
        var pd = PdOf(p);
        if (pd is null) return;

        int lvl = LevelOf(pd, key);
        int max = DefFor(key).MaxLevel;
        if (pd.Points <= 0 || lvl >= max) return;

        pd.Upgrades[key] = lvl + 1;
        pd.Points--;
        pd.Dirty = true;
        DeferReapplyCaps(p); // re-apply the new max HP/armor next frame (slot+SteamID-pinned)
        p.PrintToChat($"[Outnumbered] {key} -> {lvl + 1}/{max} ({pd.Points} point(s) left).");
    }

    // ---- !prestige ----
    private void OpenPrestige(CCSPlayerController p)
    {
        var pd = PdOf(p);
        if (pd is null) return;

        if (pd.Level < Config.Progression.LevelCap)
        {
            p.PrintToChat($"[Outnumbered] Reach level {Config.Progression.LevelCap} to prestige (you're {pd.Level}).");
            return;
        }
        if (pd.Prestige >= Config.Progression.PrestigeCap)
        {
            p.PrintToChat($"[Outnumbered] Max prestige ({Roman(pd.Prestige)}) — 100% complete!");
            return;
        }

        var menu = new ChatMenu($"Prestige {Roman(pd.Prestige + 1)}? FULL RESET (level/points/stats)");
        menu.AddMenuOption("YES — prestige now", (player, _) => DoPrestige(player));
        menu.AddMenuOption("Cancel", (_, _) => { });
        menu.Open(p);
    }

    private void DoPrestige(CCSPlayerController p)
    {
        var pd = PdOf(p);
        if (pd is null) return;
        if (pd.Level < Config.Progression.LevelCap || pd.Prestige >= Config.Progression.PrestigeCap) return;

        pd.Prestige++;
        pd.Level = 1;
        pd.Xp = 0;
        pd.Points = 1;
        pd.Upgrades.Clear();
        pd.Dirty = true;

        // Re-apply the default loadout (level 1 re-locks the high-tier guns) and reset HP/armor to base on the live pawn.
        DeferReapplyCaps(p, relockLoadout: true); // slot+SteamID-pinned so a within-frame slot-reuse can't inherit this reset
        ApplyClan(p, pd); // prestige + reset to L1 changes the tag
        PlaySound(p, Config.Sounds.Prestige);
        Server.PrintToChatAll($"[Outnumbered] {p.PlayerName} reached Prestige {Roman(pd.Prestige)}!");
    }
}