-- [ PREVIEW ANIMATOR ]------------------------------------------------------------------------------
-- Drives animated bars, death/OOR transitions, and healer aura randomization on preview frames.
local _, Orbit = ...

Orbit.PreviewAnimator = {}
local PA = Orbit.PreviewAnimator
-- Per-owner enable table: animations only run for explicitly enabled plugins.
local enabledOwners = {}

-- [ CONSTANTS ]-------------------------------------------------------------------------------------
local TICK_INTERVAL = 0.10
local PHASE_SPEED = 0.03
local HEALTH_AMPLITUDE = 0.18
local SHIELD_AMPLITUDE = 0.15
local SHIELD_BASE = 0.25
local SHIELD_FREQUENCY = 0.4
local NECROTIC_AMPLITUDE = 0.12
local NECROTIC_BASE = 0.20
local NECROTIC_FREQUENCY = 0.3
local DAMAGE_BAR_DECAY = 0.08
local TWO_PI = math.pi * 2
local OFFLINE_ALPHA = 0.35
local OOR_ALPHA = 0.55
local DEATH_FADE_RATE = 0.016
local REVIVE_RATE = 0.024
local RESHUFFLE_INTERVAL = 12
local AURA_TICK_INTERVAL = 1
local AURA_DURATION_MIN = 8
local AURA_DURATION_MAX = 20
local AURA_RESPAWN_MIN = 6
local AURA_RESPAWN_MAX = 15
local HEALER_TICK_INTERVAL = 3.0
local HEALER_SHOW_CHANCE = 0.6
local RAIDBUFF_SHOW_CHANCE = 0.7
local DEFENSIVE_SHOW_CHANCE = 0.15
local CC_SHOW_CHANCE = 0.12
local DISPEL_DURATION = 6
local DISPEL_TYPES = { "Magic", "Curse", "Disease", "Poison" }
local DYING_DELAY_BASE = 3
local DYING_DELAY_RANGE = 5
local SHIELD_CHANCE = 0.55
local NECROTIC_CHANCE = 0.35
local HEALTH_AMP_BASE = 0.10
local HEALTH_AMP_RANGE = 0.15
local CHUNK_DAMAGE_CHANCE = 0.30
local CHUNK_NEXT_BASE = 2
local CHUNK_NEXT_RANGE = 4
local DEAD_DURATION_BASE = 5
local DEAD_DURATION_RANGE = 5
local OOR_DURATION_BASE = 3
local OOR_DURATION_RANGE = 4
local CHUNK_DROP_BASE = 0.20
local CHUNK_DROP_RANGE = 0.20
local CHUNK_MIN_HEALTH = 0.10
local CHUNK_REGEN_RATE = 0.003
local CHUNK_REFIRE_BASE = 3
local CHUNK_REFIRE_RANGE = 5
local DEFAULT_BASE_HEALTH = 0.75
local DEFAULT_SHIELD_CHANCE = 0.4
local DEFAULT_NECROTIC_CHANCE = 0.2

-- [ BEHAVIOR TYPES ]--------------------------------------------------------------------------------
local B_NORMAL = 1
local B_DYING = 2
local B_DEAD = 3
local B_REVIVING = 4
local B_OOR = 5
local B_EXIT = 6
local EXIT_RATE = 0.05
local EXIT_ALPHA_RATE = 0.03
local EXIT_MIN_HEALTH = 0.01

-- [ SESSION REGISTRY ]------------------------------------------------------------------------------
-- Keyed by owner (plugin self), so Party/Raid/Boss can animate concurrently.
local sessions = {}
local ticker
local phase = 0
local globalElapsed = 0

local auraSessions = {}
local auraTicker

local healerSessions = {}
local healerTicker

local dispelSessions = {}
local dispelTicker

-- [ BEHAVIOR ASSIGNMENT ]---------------------------------------------------------------------------
local function AssignRandomBehaviors(activeCfg)
    local candidates = {}
    for i, cfg in ipairs(activeCfg) do
        if cfg.behavior == B_NORMAL and not cfg.dead then candidates[#candidates + 1] = i end
    end
    if #candidates < 2 then return end
    for j = #candidates, 2, -1 do
        local k = math.random(1, j)
        candidates[j], candidates[k] = candidates[k], candidates[j]
    end
    local assigned = 0
    for _, idx in ipairs(candidates) do
        local cfg = activeCfg[idx]
        assigned = assigned + 1
        if assigned == 1 then
            cfg.canDie = true; cfg.dyingDelay = DYING_DELAY_BASE + math.random() * DYING_DELAY_RANGE; cfg.canOOR = false
        else
            cfg.canDie = false; cfg.canOOR = false
        end
        cfg.showShield = (math.random() < SHIELD_CHANCE)
        cfg.showNecrotic = (math.random() < NECROTIC_CHANCE)
        cfg.healthAmplitude = HEALTH_AMP_BASE + math.random() * HEALTH_AMP_RANGE
        cfg.chunkyDamage = (math.random() < CHUNK_DAMAGE_CHANCE)
        if cfg.chunkyDamage then
            cfg.nextChunkAt = cfg.elapsed + CHUNK_NEXT_BASE + math.random() * CHUNK_NEXT_RANGE
        end
    end
end

-- [ BEHAVIOR TRANSITIONS ]--------------------------------------------------------------------------
local function TransitionBehavior(cfg, frame)
    local b = cfg.behavior
    if b == B_NORMAL then
        cfg.elapsed = cfg.elapsed + TICK_INTERVAL
        if cfg.canDie and cfg.elapsed > cfg.dyingDelay then
            cfg.behavior = B_DYING; cfg.elapsed = 0
        elseif cfg.canOOR and cfg.elapsed > cfg.oorDelay then
            cfg.behavior = B_OOR; cfg.oorDuration = OOR_DURATION_BASE + math.random() * OOR_DURATION_RANGE; cfg.elapsed = 0
        end
    elseif b == B_DYING then
        cfg.currentHealth = math.max(0, cfg.currentHealth - DEATH_FADE_RATE)
        frame.Health:SetMinMaxValues(0, 1)
        frame.Health:SetValue(cfg.currentHealth)
        if frame.HealthText and frame.HealthText:IsShown() then
            frame.HealthText:SetFormattedText("%.0f%%", cfg.currentHealth * 100)
        end
        if cfg.currentHealth <= 0 then
            cfg.currentHealth = 0
            cfg.behavior = B_DEAD; cfg.deadDuration = DEAD_DURATION_BASE + math.random() * DEAD_DURATION_RANGE; cfg.elapsed = 0
            frame.Health:SetValue(0)
            if frame.HealthText and frame.HealthText:IsShown() then frame.HealthText:SetText("Dead") end
            cfg.alpha = OFFLINE_ALPHA; frame:SetAlpha(OFFLINE_ALPHA)
            if frame.ResIcon then frame.ResIcon:SetAtlas("RaidFrame-Icon-Rez"); frame.ResIcon:Show() end
            Orbit.AuraPreview:HideFrameAuras(frame)
            frame._previewDead = true
        end
        return true
    elseif b == B_DEAD then
        cfg.elapsed = cfg.elapsed + TICK_INTERVAL
        if cfg.elapsed > cfg.deadDuration then
            cfg.behavior = B_REVIVING; cfg.elapsed = 0
            if frame.ResIcon then frame.ResIcon:Hide() end
        end
        return true
    elseif b == B_REVIVING then
        cfg.currentHealth = math.min(cfg.baseHealth, cfg.currentHealth + REVIVE_RATE)
        frame.Health:SetMinMaxValues(0, 1)
        frame.Health:SetValue(cfg.currentHealth)
        if frame.HealthText and frame.HealthText:IsShown() then
            frame.HealthText:SetFormattedText("%.0f%%", cfg.currentHealth * 100)
        end
        if cfg.alpha < 1 then cfg.alpha = math.min(1, cfg.alpha + 0.02); frame:SetAlpha(cfg.alpha) end
        if cfg.currentHealth >= cfg.baseHealth then
            cfg.behavior = B_NORMAL; cfg.elapsed = 0; cfg.canDie = false; cfg.canOOR = false
            cfg.alpha = 1; frame:SetAlpha(1)
            frame._previewDead = nil
        end
        return true
    elseif b == B_OOR then
        cfg.elapsed = cfg.elapsed + TICK_INTERVAL
        if cfg.elapsed < cfg.oorDuration then
            if cfg.alpha > OOR_ALPHA then cfg.alpha = math.max(OOR_ALPHA, cfg.alpha - 0.02); frame:SetAlpha(cfg.alpha) end
        else
            if cfg.alpha < 1 then cfg.alpha = math.min(1, cfg.alpha + 0.02); frame:SetAlpha(cfg.alpha) end
            if cfg.alpha >= 0.99 then
                cfg.behavior = B_NORMAL; cfg.elapsed = 0; cfg.canOOR = false; cfg.canDie = false
                cfg.alpha = 1; frame:SetAlpha(1)
            end
        end
    elseif b == B_EXIT then
        local done = true
        -- Lerp health to 1.0
        if cfg.currentHealth < 1.0 then
            cfg.currentHealth = math.min(1.0, cfg.currentHealth + EXIT_RATE)
            done = false
        end
        frame.Health:SetMinMaxValues(0, 1)
        frame.Health:SetValue(cfg.currentHealth)
        if frame.HealthText and frame.HealthText:IsShown() then
            frame.HealthText:SetFormattedText("%.0f%%", cfg.currentHealth * 100)
        end
        -- Fade alpha to 1
        if cfg.alpha < 1 then cfg.alpha = math.min(1, cfg.alpha + EXIT_ALPHA_RATE); frame:SetAlpha(cfg.alpha); done = false end
        -- Hide overlay bars
        if frame.TotalAbsorbBar then frame.TotalAbsorbBar:Hide(); if frame.TotalAbsorbOverlay then frame.TotalAbsorbOverlay:Hide() end end
        if frame.HealAbsorbBar then frame.HealAbsorbBar:Hide() end
        if frame.HealthDamageBar then frame.HealthDamageBar:Hide(); if frame.HealthDamageTexture then frame.HealthDamageTexture:Hide() end end
        if frame.ResIcon then frame.ResIcon:Hide() end
        frame._previewDead = nil
        if done then cfg.exitDone = true end
        return true
    end
    return false
end

-- [ ANIMATE OVERLAY BARS ]--------------------------------------------------------------------------
local function AnimateOverlayBars(frame, cfg, curPhase, offset)
    local healthTex = frame.Health:GetStatusBarTexture()
    local totalW = frame.Health:GetWidth()
    if frame.TotalAbsorbBar and cfg.showShield then
        local shieldWave = math.sin((curPhase + offset) * TWO_PI * SHIELD_FREQUENCY + 1.5)
        local shield = math.max(0, SHIELD_BASE + shieldWave * SHIELD_AMPLITUDE)
        frame.TotalAbsorbBar:SetMinMaxValues(0, 1)
        frame.TotalAbsorbBar:SetValue(shield)
        frame.TotalAbsorbBar:ClearAllPoints()
        frame.TotalAbsorbBar:SetWidth(totalW)
        frame.TotalAbsorbBar:SetPoint("TOPLEFT", healthTex, "TOPRIGHT", 0, 0)
        frame.TotalAbsorbBar:SetPoint("BOTTOMLEFT", healthTex, "BOTTOMRIGHT", 0, 0)
        frame.TotalAbsorbBar:Show()
        if frame.TotalAbsorbOverlay then
            frame.TotalAbsorbOverlay:Show()
            frame.TotalAbsorbOverlay:SetAllPoints(frame.TotalAbsorbBar:GetStatusBarTexture())
        end
    elseif frame.TotalAbsorbBar then
        frame.TotalAbsorbBar:Hide()
        if frame.TotalAbsorbOverlay then frame.TotalAbsorbOverlay:Hide() end
    end
    if frame.HealAbsorbBar and cfg.showNecrotic then
        local necWave = math.sin((curPhase + offset) * TWO_PI * NECROTIC_FREQUENCY + 3.0)
        local nec = math.max(0, NECROTIC_BASE + necWave * NECROTIC_AMPLITUDE)
        frame.HealAbsorbBar:SetMinMaxValues(0, 1)
        frame.HealAbsorbBar:SetValue(nec)
        frame.HealAbsorbBar:ClearAllPoints()
        frame.HealAbsorbBar:SetWidth(totalW)
        frame.HealAbsorbBar:SetPoint("TOPRIGHT", healthTex, "TOPRIGHT", 0, 0)
        frame.HealAbsorbBar:SetPoint("BOTTOMRIGHT", healthTex, "BOTTOMRIGHT", 0, 0)
        frame.HealAbsorbBar:Show()
    elseif frame.HealAbsorbBar then
        frame.HealAbsorbBar:Hide()
    end
end

-- [ CORE TICK ]-------------------------------------------------------------------------------------
local function AnimateTick()
    phase = (phase + PHASE_SPEED) % 1
    globalElapsed = globalElapsed + TICK_INTERVAL
    local shouldReshuffle = globalElapsed > RESHUFFLE_INTERVAL
    if shouldReshuffle then globalElapsed = 0 end

    for owner, session in pairs(sessions) do
        if shouldReshuffle and not session.exitPlugin then AssignRandomBehaviors(session.cfg) end
        for i, frame in ipairs(session.frames) do
            if frame:IsShown() then
                local cfg = session.cfg[i]
                if cfg then
                    local skipNormal = TransitionBehavior(cfg, frame)
                    if not skipNormal and cfg.behavior ~= B_DEAD then
                        local offset = (i * 0.17) % 1
                        local hp
                        if cfg.chunkyDamage then
                            cfg.elapsed = cfg.elapsed + TICK_INTERVAL
                            if cfg.elapsed >= (cfg.nextChunkAt or 999) then
                                local drop = CHUNK_DROP_BASE + math.random() * CHUNK_DROP_RANGE
                                cfg.currentHealth = math.max(CHUNK_MIN_HEALTH, cfg.currentHealth - drop)
                                cfg.nextChunkAt = cfg.elapsed + CHUNK_REFIRE_BASE + math.random() * CHUNK_REFIRE_RANGE
                            else
                                cfg.currentHealth = math.min(cfg.baseHealth or DEFAULT_BASE_HEALTH, cfg.currentHealth + CHUNK_REGEN_RATE)
                            end
                            hp = cfg.currentHealth
                        else
                            local wave = math.sin((phase + offset) * TWO_PI)
                            hp = math.max(0.05, math.min(1.0, (cfg.baseHealth or 0.75) + wave * (cfg.healthAmplitude or HEALTH_AMPLITUDE)))
                        end
                        local prevHP = cfg.prevHealth
                        cfg.currentHealth = hp
                        frame.Health:SetMinMaxValues(0, 1)
                        frame.Health:SetValue(hp)
                        if frame.HealthDamageBar then
                            frame.HealthDamageBar:SetMinMaxValues(0, 1)
                            if hp < prevHP then
                                cfg.dmgBarVal = prevHP
                                frame.HealthDamageBar:SetValue(prevHP)
                                frame.HealthDamageBar:Show()
                                if frame.HealthDamageTexture then frame.HealthDamageTexture:Show() end
                            else
                                local decay = cfg.dmgBarVal - DAMAGE_BAR_DECAY
                                if decay <= hp then
                                    cfg.dmgBarVal = hp
                                    frame.HealthDamageBar:SetValue(hp)
                                    if frame.HealthDamageTexture then frame.HealthDamageTexture:Hide() end
                                else
                                    cfg.dmgBarVal = decay
                                    frame.HealthDamageBar:SetValue(decay)
                                end
                            end
                        end
                        AnimateOverlayBars(frame, cfg, phase, offset)
                        if frame.HealthText and frame.HealthText:IsShown() then
                            frame.HealthText:SetFormattedText("%.0f%%", hp * 100)
                        end
                        cfg.prevHealth = hp
                    end
                end
            end
        end

        -- Check if exit transition completed for all frames
        if session.exitPlugin then
            local allDone = true
            for _, cfg in ipairs(session.cfg) do
                if not cfg.exitDone then allDone = false; break end
            end
            if allDone then
                local p = session.exitPlugin
                sessions[owner] = nil
                PA:StopAuras(p)
                PA:StopHealerAuras(p)
                PA:StopDispels(p)
                if p.ApplyPreviewVisuals then p:ApplyPreviewVisuals() end
            end
        end
    end

    if not next(sessions) then ticker:Cancel(); ticker = nil end
end

-- [ AURA TICK ]-------------------------------------------------------------------------------------
local function RelayoutGroup(group)
    local c = group.container
    local col, row = 0, 0
    local visibleCount = 0
    for _, icon in ipairs(group.icons) do if icon:IsShown() then visibleCount = visibleCount + 1 end end
    for _, icon in ipairs(group.icons) do
        if icon:IsShown() then
            icon:ClearAllPoints()
            col, row = Orbit.AuraLayout:PositionIcon(icon, c, c._justifyH, c._anchorY, col, row, c._iconSize, c._iconsPerRow, visibleCount)
        end
    end
end

local function AuraTick()
    local now = GetTime()
    local AP = Orbit.AuraPreview
    for _, session in pairs(auraSessions) do
        for i, frame in ipairs(session.frames) do
            if frame:IsShown() and not frame._previewDead then
                local cfg = session.cfg[i]
                if cfg and cfg.groups then
                    for _, group in ipairs(cfg.groups) do
                        local changed = false
                        for j, slot in ipairs(group.slots) do
                            local icon = group.icons[j]
                            if icon and now >= slot.nextEvent then
                                if slot.active then
                                    icon:Hide()
                                    slot.active = false
                                    slot.nextEvent = now + math.random(AURA_RESPAWN_MIN, AURA_RESPAWN_MAX)
                                else
                                    -- Skip spawning new auras when draining
                                    if session.draining then slot.nextEvent = now + 9999
                                    else
                                    local activeCount = 0
                                    for _, s in ipairs(group.slots) do if s.active then activeCount = activeCount + 1 end end
                                    local spawnChance = (1 - (activeCount / #group.icons)) ^ 2
                                    if math.random() < spawnChance then
                                        local dur = math.random(AURA_DURATION_MIN, AURA_DURATION_MAX)
                                        icon.Icon:SetTexture(AP.GetSpellbookIcon())
                                        icon.Cooldown:SetCooldown(now, dur)
                                        icon:Show()
                                        slot.active = true
                                        slot.nextEvent = now + dur
                                    else
                                        slot.nextEvent = now + math.random(2, 5)
                                    end
                                    end
                                end
                                changed = true
                            end
                        end
                        if changed then RelayoutGroup(group) end
                    end
                end
            end
        end
    end
    if not next(auraSessions) then auraTicker:Cancel(); auraTicker = nil end
end

-- [ HEALER AURA TICK ]------------------------------------------------------------------------------
local function HealerAuraTick()
    for _, session in pairs(healerSessions) do
        if session.draining then break end
        for i, frame in ipairs(session.frames) do
            if frame:IsShown() then
                local cfg = session.cfg[i]
                if cfg and cfg.healerSlots then
                    for _, slot in ipairs(cfg.healerSlots) do
                        local icon = frame[slot.key]
                        if icon then icon:SetShown(math.random() < HEALER_SHOW_CHANCE) end
                    end
                end
                if cfg and cfg.raidBuffKey and frame[cfg.raidBuffKey] then
                    frame[cfg.raidBuffKey]:SetShown(math.random() < RAIDBUFF_SHOW_CHANCE)
                end
                -- Rare defensive/CC icon toggling
                if frame.DefensiveIcon and not cfg.defensiveDisabled then
                    frame.DefensiveIcon:SetShown(math.random() < DEFENSIVE_SHOW_CHANCE)
                end
                if frame.CrowdControlIcon and not cfg.ccDisabled then
                    frame.CrowdControlIcon:SetShown(math.random() < CC_SHOW_CHANCE)
                end
            end
        end
    end
    if not next(healerSessions) then healerTicker:Cancel(); healerTicker = nil end
end

-- [ PUBLIC API ]------------------------------------------------------------------------------------
function PA:Start(owner, frames, cfgList)
    if not enabledOwners[owner] then return end
    self:Stop(owner)
    for _, cfg in ipairs(cfgList) do
        cfg.prevHealth = cfg.baseHealth or DEFAULT_BASE_HEALTH
        cfg.currentHealth = cfg.baseHealth or DEFAULT_BASE_HEALTH
        cfg.dmgBarVal = cfg.baseHealth or DEFAULT_BASE_HEALTH
        cfg.elapsed = 0; cfg.alpha = 1
        cfg.behavior = cfg.behavior or B_NORMAL
        if cfg.showShield == nil then cfg.showShield = (math.random() < DEFAULT_SHIELD_CHANCE) end
        if cfg.showNecrotic == nil then cfg.showNecrotic = (math.random() < DEFAULT_NECROTIC_CHANCE) end
        cfg.healthAmplitude = cfg.healthAmplitude or (HEALTH_AMP_BASE + math.random() * HEALTH_AMP_RANGE)
    end
    AssignRandomBehaviors(cfgList)
    sessions[owner] = { frames = frames, cfg = cfgList }
    if not ticker then phase = 0; globalElapsed = 0; ticker = C_Timer.NewTicker(TICK_INTERVAL, AnimateTick) end
end

function PA:Stop(owner)
    local session = sessions[owner]
    if session then
        for _, frame in ipairs(session.frames) do
            if frame.HealthDamageBar then
                frame.HealthDamageBar:Hide()
                if frame.HealthDamageTexture then frame.HealthDamageTexture:Hide() end
            end
            if frame.TotalAbsorbBar then
                frame.TotalAbsorbBar:Hide()
                if frame.TotalAbsorbOverlay then frame.TotalAbsorbOverlay:Hide() end
            end
            if frame.HealAbsorbBar then frame.HealAbsorbBar:Hide() end
            if frame.ResIcon then frame.ResIcon:Hide() end
            frame:SetAlpha(1)
        end
        sessions[owner] = nil
    end
end

function PA:IsRunning() return ticker ~= nil end

function PA:SetEnabled(owner, enabled) enabledOwners[owner] = enabled or nil end
function PA:IsEnabled(owner) return enabledOwners[owner] == true end

-- [ AURA ANIMATION API ]---------------------------------------------------------------------------
function PA:StartAuras(owner, frames, cfgList)
    if not enabledOwners[owner] then return end
    self:StopAuras(owner)
    local now = GetTime()
    local frameCount = #frames
    local offsetScale = math.min(1, frameCount / 20)
    for i, cfg in ipairs(cfgList) do
        local frame = frames[i]
        if frame:IsShown() and cfg.initAuras then
            cfg.groups = cfg.initAuras(frame)
            local offset = math.random() * 15 * offsetScale
            for _, group in ipairs(cfg.groups) do
                -- Shuffle icons so positions aren't predictable
                for k = #group.icons, 2, -1 do
                    local m = math.random(1, k)
                    group.icons[k], group.icons[m] = group.icons[m], group.icons[k]
                end
                group.slots = {}
                for j = 1, #group.icons do
                    group.slots[j] = { active = false, nextEvent = now + offset + math.random() * 12 * offsetScale }
                end
            end
        end
    end
    auraSessions[owner] = { frames = frames, cfg = cfgList }
    if not auraTicker then auraTicker = C_Timer.NewTicker(AURA_TICK_INTERVAL, AuraTick) end
end

function PA:StopAuras(owner)
    local session = auraSessions[owner]
    if session then
        for _, frame in ipairs(session.frames) do Orbit.AuraPreview:HideFrameAuras(frame) end
    end
    auraSessions[owner] = nil
end

-- [ HEALER AURA ANIMATION API ]---------------------------------------------------------------------
function PA:StartHealerAuras(owner, frames, cfgList)
    if not enabledOwners[owner] then return end
    self:StopHealerAuras(owner)
    healerSessions[owner] = { frames = frames, cfg = cfgList }
    -- Fire immediately
    for i, frame in ipairs(frames) do
        if frame:IsShown() then
            local cfg = cfgList[i]
            if cfg and cfg.healerSlots then
                for _, slot in ipairs(cfg.healerSlots) do
                    local icon = frame[slot.key]
                    if icon then icon:SetShown(math.random() < HEALER_SHOW_CHANCE) end
                end
            end
        end
    end
    if not healerTicker then healerTicker = C_Timer.NewTicker(HEALER_TICK_INTERVAL, HealerAuraTick) end
end

function PA:StopHealerAuras(owner)
    healerSessions[owner] = nil
end

-- [ DISPEL ANIMATION ]------------------------------------------------------------------------------
local LCG = LibStub("LibCustomGlow-1.0", true)

local function DispelTick()
    if not LCG then return end
    local now = GetTime()
    for _, session in pairs(dispelSessions) do
        local frames = session.frames
        local numFrames = #frames
        if numFrames == 0 then break end
        for _, slot in ipairs(session.slots) do
            if now >= slot.expiresAt then
                if slot.frame then LCG.PixelGlow_Stop(slot.frame, "dispelPreview") end
                local alive = {}
                for _, f in ipairs(frames) do if not f._previewDead then alive[#alive + 1] = f end end
                if #alive == 0 then
                    slot.frame = nil; slot.expiresAt = now + 2
                else
                    local pick
                    repeat pick = alive[math.random(1, #alive)] until #alive < 2 or pick ~= slot.frame
                    slot.frame = pick
                    slot.expiresAt = now + DISPEL_DURATION + math.random() * 4
                    local c = session.colors[slot.dispelType]
                    LCG.PixelGlow_Start(slot.frame, { c.r, c.g, c.b, c.a }, session.numLines, session.frequency, nil, session.thickness, 0, 0, true, "dispelPreview", Orbit.Constants.Levels.Border)
                end
            end
        end
    end
    if not next(dispelSessions) then dispelTicker:Cancel(); dispelTicker = nil end
end

function PA:StartDispels(owner, frames, cfg)
    if not enabledOwners[owner] then return end
    self:StopDispels(owner)
    local now = GetTime()
    local slots = {}
    for i, dt in ipairs(DISPEL_TYPES) do
        slots[i] = { dispelType = dt, frame = nil, expiresAt = now + (i - 1) * 1.5 }
    end
    dispelSessions[owner] = { frames = frames, slots = slots, colors = cfg.colors, thickness = cfg.thickness, frequency = cfg.frequency, numLines = cfg.numLines }
    if not dispelTicker then dispelTicker = C_Timer.NewTicker(1, DispelTick) end
end

function PA:StopDispels(owner)
    local session = dispelSessions[owner]
    if session and LCG then
        for _, slot in ipairs(session.slots) do
            if slot.frame then LCG.PixelGlow_Stop(slot.frame, "dispelPreview") end
        end
    end
    dispelSessions[owner] = nil
end

-- [ CONSOLIDATED START ]----------------------------------------------------------------------------
-- desc = { frames, getHelpers, getHealth(i), getDead(i), healerSlots?, raidBuffKey?, dispelSettings? }
function PA:StartAll(plugin, desc)
    if not enabledOwners[plugin] then return end
    local isDisabled = plugin.IsComponentDisabled and function(k) return plugin:IsComponentDisabled(k) end or function() return false end
    local buffsEnabled = not isDisabled("Buffs")
    local debuffsEnabled = not isDisabled("Debuffs")
    local animFrames, animCfg = {}, {}
    local auraFrames, auraCfg = {}, {}
    local healerFrames, healerCfg = {}, {}
    for i, frame in ipairs(desc.frames) do
        if frame.preview and frame:IsShown() then
            animFrames[#animFrames + 1] = frame
            animCfg[#animCfg + 1] = { baseHealth = desc.getHealth(i), dead = desc.getDead and desc.getDead(i) }
            if buffsEnabled or debuffsEnabled then
                auraFrames[#auraFrames + 1] = frame
                auraCfg[#auraCfg + 1] = { initAuras = function(f) return Orbit.AuraPreview:InitAnimatedAuras(plugin, f, desc.getHelpers) end }
            end
            if desc.healerSlots then
                healerFrames[#healerFrames + 1] = frame
                healerCfg[#healerCfg + 1] = {
                    healerSlots = desc.healerSlots,
                    raidBuffKey = desc.raidBuffKey,
                    defensiveDisabled = isDisabled("DefensiveIcon"),
                    ccDisabled = isDisabled("CrowdControlIcon"),
                }
            end
        end
    end
    if #animFrames > 0 then self:Start(plugin, animFrames, animCfg) end
    if #auraFrames > 0 then self:StartAuras(plugin, auraFrames, auraCfg) end
    if #healerFrames > 0 then self:StartHealerAuras(plugin, healerFrames, healerCfg) end
    if desc.dispelSettings and #animFrames > 0 then self:StartDispels(plugin, animFrames, desc.dispelSettings) end
end

function PA:StopAll(plugin)
    self:Stop(plugin)
    self:StopAuras(plugin)
    self:StopHealerAuras(plugin)
    self:StopDispels(plugin)
    self:SetEnabled(plugin, false)
end

function PA:ExitAll(plugin)
    -- Mark secondary systems as draining (no new spawns, existing ones stay visible)
    self:SetEnabled(plugin, false)
    if auraSessions[plugin] then auraSessions[plugin].draining = true end
    if healerSessions[plugin] then healerSessions[plugin].draining = true end
    if dispelSessions[plugin] then dispelSessions[plugin].draining = true end
    -- Switch health bar session to exit mode (lerp back to static state)
    local session = sessions[plugin]
    if session then
        for _, cfg in ipairs(session.cfg) do
            cfg.behavior = B_EXIT
            cfg.canDie = false; cfg.canOOR = false; cfg.exitDone = false
            if cfg.currentHealth <= 0 then cfg.currentHealth = EXIT_MIN_HEALTH end
        end
        session.exitPlugin = plugin
    else
        -- No active bar session, clean up and apply immediately
        self:StopAuras(plugin)
        self:StopHealerAuras(plugin)
        self:StopDispels(plugin)
        if plugin.ApplyPreviewVisuals then plugin:ApplyPreviewVisuals() end
    end
end
function PA:WatchCanvas(plugin)
    if not plugin._canvasSettingsCallback then
        plugin._canvasSettingsCallback = function(targetPlugin)
            if targetPlugin ~= plugin then return end
            if plugin.SchedulePreviewUpdate then plugin:SchedulePreviewUpdate() end
        end
    end
    Orbit.EventBus:On("CANVAS_SETTINGS_CHANGED", plugin._canvasSettingsCallback)
end

function PA:UnwatchCanvas(plugin)
    if plugin._canvasSettingsCallback then
        Orbit.EventBus:Off("CANVAS_SETTINGS_CHANGED", plugin._canvasSettingsCallback)
    end
end
