local squad
local nameDistance, haloDistance

function SquadMenu:RemoveMembersHUD()
    if self.membersPanel then
        self.membersPanel:Remove()
    end

    self.membersPanel = nil

    hook.Remove( "PrePlayerDraw", "SquadMenu.DrawRing" )
    hook.Remove( "PreDrawHalos", "SquadMenu.DrawHalos" )
    hook.Remove( "HUDPaint", "SquadMenu.DrawHUD" )
    hook.Remove( "HUDDrawTargetID", "SquadMenu.HideTargetInfo" )
    hook.Remove( "PlayerButtonDown", "SquadMenu.PingKey" )
end

function SquadMenu:UpdateMembersHUD()
    local config = self.Config

    squad = self.mySquad
    nameDistance = config.nameDistance * config.nameDistance
    haloDistance = config.haloDistance * config.haloDistance

    if config.showRings and self.mySquad.enableRings then
        hook.Add( "PrePlayerDraw", "SquadMenu.DrawRing", self.DrawRing )
    else
        hook.Remove( "PrePlayerDraw", "SquadMenu.DrawRing" )
    end

    if config.showHalos then
        hook.Add( "PreDrawHalos", "SquadMenu.DrawHalos", self.DrawHalos )
    else
        hook.Remove( "PreDrawHalos", "SquadMenu.DrawHalos" )
    end

    hook.Add( "HUDPaint", "SquadMenu.DrawHUD", self.DrawHUD )
    hook.Add( "HUDDrawTargetID", "SquadMenu.HideTargetInfo", self.HideTargetInfo )
    hook.Add( "PlayerButtonDown", "SquadMenu.PingKey", self.PingKey )

    if self.membersPanel then
        self.membersPanel:SetVisible( config.showMembers )
        return
    end

    local panel = vgui.Create( "DPanel" )
    panel:SetVisible( config.showMembers )
    panel:SetPaintBackground( false )
    panel:ParentToHUD()
    panel._OriginalInvalidateLayout = panel.InvalidateLayout

    panel.InvalidateLayout = function( s, layoutNow )
        local screenW, screenH = ScrW(), ScrH()

        local childCount = #s:GetChildren()
        local childH = math.Round( screenH * 0.04 )
        local childOffset = math.max( 1, math.Round( screenH * 0.002 ) )

        local w = screenH * 0.22
        local h = ( childH + childOffset ) * childCount

        s.childH = childH
        s.childOffset = childOffset
        s:SetSize( w, h )

        local position = math.Clamp( SquadMenu.GetMembersPosition(), 1, 9 )
        local offset = screenH * 0.02
        local x, y

        if position == 1 or position == 4 or position == 7 then
            -- left
            x = offset

        elseif position == 2 or position == 5 or position == 8 then
            -- center
            x = ( screenW * 0.5 ) - ( w * 0.5 )
        else
            -- right
            x = screenW - w - offset
        end

        if position == 7 or position == 8 or position == 9 then
            -- top
            y = offset

        elseif position == 4 or position == 5 or position == 6 then
            -- center
            y = ( screenH * 0.5 ) - ( h * 0.5 )
        else
            -- bottom
            y = screenH - h - offset
        end

        s:SetPos( x, y )
        s:_OriginalInvalidateLayout( layoutNow )
    end

    panel.PerformLayout = function( s, w )
        local children = s:GetChildren()
        if #children == 0 then return end

        local offset = s.childOffset or 1
        local height = s.childH or 24
        local y = 0

        for _, p in ipairs( children ) do
            p:SetSize( w, height )
            p:SetPos( 0, y )

            y = y + height + offset
        end
    end

    self.membersPanel = panel
end

function SquadMenu:AddMemberToHUD( member )
    member.panel = vgui.Create( "Squad_MemberInfo", self.membersPanel )
    member.panel:SetPlayer( member.id, member.name, squad )

    self.membersPanel:InvalidateLayout()
end

function SquadMenu:RemoveMemberFromHUD( member )
    if member.panel then
        member.panel:Remove()
        member.panel = nil
    end
end

----------

local COLORS = {
    WHITE = Color( 255, 255, 255, 255 ),
    HEALTH = Color( 94, 253, 255, 255 ),
    LOW_HEALTH = Color( 250, 20, 20, 255 ),
    BOX_BG = Color( 0, 0, 0, 200 )
}

local SetColor = surface.SetDrawColor
local DrawRect = surface.DrawRect
local DrawOutlinedRect = surface.DrawOutlinedRect

local DrawHealthBar = function( x, y, w, h, health, armor )
    if armor > 0 then
        SetColor( 255, 255, 255, 255 )
        DrawOutlinedRect( x - 1, y - 1, ( w + 2 ) * armor, h + 2, 1 )
    end

    SetColor( 20, 20, 20, 255 )
    DrawRect( x, y, w, h )

    x, y = x + 1, y + 1
    w, h = w - 2, h - 2

    local color = health < 0.3 and COLORS.LOW_HEALTH or COLORS.HEALTH

    SetColor( color:Unpack() )
    DrawRect( x, y, w * health, h )
end

SquadMenu.DrawHealthBar = DrawHealthBar

----------

local EyePos = EyePos
local Clamp = math.Clamp
local SetMaterial = surface.SetMaterial
local DrawTexturedRect = surface.DrawTexturedRect
local LocalPlayer = LocalPlayer
local PID = SquadMenu.GetPlayerId

do
    local Start3D2D = cam.Start3D2D
    local End3D2D = cam.End3D2D

    local ringMaxDist = 3000 * 3000
    local ringAngle = Angle( 0, 0, 0 )
    local ringOffset = Vector( 0, 0, 5 )
    local ringMat = Material( "squad_menu/ring.png" )

    SquadMenu.DrawRing = function( ply, flags )
        if flags == 1 then return end
        if ply == LocalPlayer() then return end
        if not squad.membersById[PID( ply )] then return end

        local pos = ply:GetPos()
        local mult = Clamp( pos:DistToSqr( EyePos() ) / ringMaxDist, 0, 1 )
        local size = 300 + 1000 * mult

        Start3D2D( pos + ringOffset * mult, ringAngle, 0.08 )

        SetMaterial( ringMat )
        SetColor( squad.color:Unpack() )
        DrawTexturedRect( -size * 0.5, -size * 0.5, size, size )

        End3D2D()
    end
end

----------

local AllPlayersById = SquadMenu.AllPlayersById

SquadMenu.DrawHalos = function()
    local origin = EyePos()
    local me = LocalPlayer()
    local byId = AllPlayersById()
    local i, t, dist = 0, {}

    for _, member in ipairs( squad.members ) do
        local ply = byId[member.id]

        if ply and ply ~= me and ply:Alive() and not ply:IsDormant() then
            dist = origin:DistToSqr( ply:EyePos() )

            if dist < haloDistance then
                i = i + 1
                t[i] = ply
            end
        end
    end

    if i > 0 then
        halo.Add( t, squad.color, 2, 2, 1, true, true )
    end
end

----------

SquadMenu.HideTargetInfo = function()
    local trace = util.TraceLine( util.GetPlayerTrace( LocalPlayer() ) )
    if not trace.Hit or not trace.HitNonWorld then return end

    local ply = trace.Entity
    if not ply:IsPlayer() then return end

    if squad.membersById[PID( ply )] and EyePos():DistToSqr( ply:EyePos() ) < nameDistance then
        return false
    end
end

----------

local DrawSimpleText = draw.SimpleText
local GetTextSize = surface.GetTextSize
local SetAlphaMultiplier = surface.SetAlphaMultiplier

local function DrawTag( ply )
    local nick = ply:Nick()
    local isAlive = ply:Alive()

    local pos = ply:EyePos():ToScreen()
    local boxW, boxH = GetTextSize( nick )

    local x = pos.x - boxW * 0.5
    local y = pos.y - boxH

    SetColor( COLORS.BOX_BG:Unpack() )
    DrawRect( x - 2, y - 2, boxW + 4, boxH + 6 )

    if isAlive then
        DrawSimpleText( nick, "SquadMenuInfo", pos.x, y, COLORS.WHITE, 1, 0 )
        DrawHealthBar( x - 2, y + boxH + 4, boxW + 4, 4, Clamp( ply:Health() / 100, 0, 1 ), ply:Armor() / 100 )
    else
        DrawSimpleText( nick, "SquadMenuInfo", pos.x, y, COLORS.LOW_HEALTH, 1, 0 )
    end
end

local DrawOutlinedText = draw.SimpleTextOutlined
local pingMat = Material( "squad_menu/ping.png", "smooth ignorez nocull" )
local pings = SquadMenu.pings or {}

SquadMenu.pings = pings

SquadMenu.DrawHUD = function()
    surface.SetFont( "SquadMenuInfo" )

    -- Draw player tags
    local origin = EyePos()
    local me = LocalPlayer()
    local byId = AllPlayersById()
    local dist

    for _, member in ipairs( squad.members ) do
        local ply = byId[member.id]

        if ply and ply ~= me and not ply:IsDormant() then
            dist = origin:DistToSqr( ply:EyePos() )

            if dist < nameDistance then
                SetAlphaMultiplier( 1 - dist / nameDistance )
                DrawTag( ply )
            end
        end
    end

    -- Draw pings
    local t = RealTime()
    local sw, sh = ScrW(), ScrH()
    local r, g, b = squad.color:Unpack()
    local size = sh * 0.025
    local border = sh * 0.01

    SetMaterial( pingMat )

    for id, p in pairs( pings ) do
        if t > p.start + p.lifetime then
            pings[id] = nil
        else
            local showAnim = Clamp( ( t - p.start ) * 6, 0, 1 )
            local hideAnim = Clamp( p.start + p.lifetime - t, 0, 1 )

            SetAlphaMultiplier( showAnim * hideAnim )

            local pos = p.pos:ToScreen()
            local x = Clamp( pos.x, border, sw - border )
            local y = Clamp( pos.y, sh * 0.05, sh - border )
            local iconY = y - size - ( size * ( 1 - showAnim ) )

            SetColor( 0, 0, 0 )
            DrawTexturedRect( 1 + x - size * 0.5, 1 + iconY, size, size )

            SetColor( r, g, b )
            DrawTexturedRect( x - size * 0.5, iconY, size, size )
            DrawOutlinedText( p.label, "SquadMenuInfo", x, y - size - sh * 0.006, squad.color, 1, 4, 1, color_black )
        end
    end

    SetAlphaMultiplier( 1 )
end

SquadMenu.PingKey = function( ply, button )
    if ply ~= LocalPlayer() then return end
    if not IsFirstTimePredicted() then return end
    if button ~= SquadMenu.Config.pingKey then return end

    local tr = ply:GetEyeTrace()
    if not tr.Hit then return end

    SquadMenu.StartCommand( SquadMenu.PING )
    net.WriteVector( tr.HitPos )
    net.SendToServer()
end