-- boss.lua
local _, addon = ...;
local unpack = unpack;
local format = string.format;
local CFrame = CreateFrame("Frame", "kehysBossInit", UIParent);
local CTimerAfter = C_Timer.After;

local barTexture = "Interface\\AddOns\\kehys\\images\\minimalist";

local function showTooltip(frame)
    GameTooltip_SetDefaultAnchor(GameTooltip, frame);
    GameTooltip:SetUnit(frame:GetAttribute("unit"));
end

local function hideTooltip()
    GameTooltip:FadeOut();
end

local id = 1;
local updaters = {};
local function initBoss(parent, y, width, height, update, event)
    assert(type(parent) == "table", "Boss frame creation missing parent!");
    assert(type(y) == "number", "Boss frame creation missing Y offset!");
    assert(type(width) == "number", "Boss frame creation missing width!");
    assert(type(height) == "number", "Boss frame creation missing height!");
    assert(type(update) == "function",
           "Boss frame creation missing update function!");
    assert(type(event) == "function",
           "Boss frame creation missing event function!");

    local unit = "boss"..id;
    local f = CreateFrame("Button", "kehysBoss"..id, parent,
                          "SecureUnitButtonTemplate,SecureHandlerStateTemplate");
    id = id + 1;
    f:Hide();
    f:SetPoint("CENTER", parent, "CENTER", 540, y+200);
    f:SetWidth(width);
    f:SetHeight(height);
    f.barwidth = width - 2; -- 1px padding
    f:SetAttribute("unit", unit);
    f:SetAttribute("displayed", unit);
    f.unit = unit;
    f.displayed = unit;
    f.boss = true;
    f.prev = {};

    updaters[f] = function()
        if f.updating then
            CTimerAfter(0.1, updaters[f]);
            return update(f);
        end
    end
    f:SetScript("OnEvent", event);
    f:SetScript("OnHide", function()
        f:UnregisterAllEvents();
        f.updating = false;
        f.prev = {};
    end);
    f:SetScript("OnShow", function()
        addon.RegisterEvents(f);
        addon.RegisterUnitEvents(f);
        event(f, "UPDATE_ALL_BARS");
        f.updating = true;
        updaters[f]();
    end);
    f:SetScript("OnEnter", showTooltip);
    f:SetScript("OnLeave", hideTooltip);
    f:RegisterForClicks("AnyDown");
    f:SetAttribute("*type1", "target");
    f:SetAttribute("*type2", "togglemenu");
    f:SetAttribute("toggleForVehicle", false);

    -- create visuals
    f.base = f:CreateTexture(nil, "BACKGROUND");
    f.base:SetAllPoints();
    f.base:SetColorTexture(0, 0, 0, 0.5);
    f.background = f:CreateTexture(nil, "BACKGROUND", nil, 1);
    f.background:SetPoint("TOPLEFT", f, "TOPLEFT", 1, -1);
    f.background:SetPoint("BOTTOMRIGHT", f, "BOTTOMRIGHT", -1, 1);
    f.health = f:CreateTexture(nil, "BORDER");
    f.health:SetPoint("TOPLEFT", f.background, "TOPLEFT");
    f.health:SetPoint("BOTTOMLEFT", f.background, "LEFT", 0, -height/8);
    f.health:SetTexture(barTexture);
    f.health:SetVertexColor(0.7, 0.7, 0.7);
    f.health:Hide();
    f.mana = f:CreateTexture(nil, "BORDER");
    f.mana:SetPoint("TOPLEFT", f.background, "LEFT", 0, -height/8);
    f.mana:SetPoint("BOTTOMLEFT", f.background, "BOTTOMLEFT");
    f.mana:SetTexture(barTexture);
    f.mana:SetVertexColor(0.1, 0.5, 0.9);
    f.mana:Hide();
    f.manatext = f:CreateFontString(nil, "ARTWORK", "GameFontHighlight");
    f.manatext:SetPoint("BOTTOMRIGHT", f.background, "BOTTOMRIGHT", -2, 1);
    f.manatext:SetFont(STANDARD_TEXT_FONT, 10);
    f.manatext:Hide();
    f.shield = f:CreateTexture(nil, "BORDER");
    f.shield:SetPoint("TOPLEFT", f.health, "TOPRIGHT");
    f.shield:SetPoint("BOTTOMLEFT", f.health, "BOTTOMRIGHT");
    f.shield:SetTexture(barTexture);
    f.shield:SetVertexColor(0, 0.7, 1);
    f.shield:Hide();
    f.shieldhl = f:CreateTexture(nil, "ARTWORK");
    f.shieldhl:SetPoint("TOPLEFT", f, "TOPRIGHT", -2, 0);
    f.shieldhl:SetPoint("BOTTOMRIGHT", f, "RIGHT", 0, -height/8);
    f.shieldhl:SetColorTexture(0.5, 0.8, 1);
    f.shieldhl:Hide();
    f.healpred = f:CreateTexture(nil, "ARTWORK");
    f.healpred:SetPoint("TOPLEFT", f.health, "TOPRIGHT");
    f.healpred:SetPoint("BOTTOMLEFT", f.health, "BOTTOMRIGHT");
    f.healpred:SetColorTexture(0.5, 0.6, 0.5);
    f.healpred:Hide();
    f.healabsorb = f:CreateTexture(nil, "ARTWORK");
    f.healabsorb:SetPoint("TOPRIGHT", f.health, "TOPRIGHT");
    f.healabsorb:SetPoint("BOTTOMRIGHT", f.health, "BOTTOMRIGHT");
    f.healabsorb:SetColorTexture(0.1, 0.1, 0.1);
    f.healabsorb:Hide();
    f.name = f:CreateFontString(nil, "OVERLAY", "GameFontHighlight");
    f.name:SetPoint("LEFT", f, "LEFT", 2, 6);
    f.text = f:CreateFontString(nil, "OVERLAY", "GameFontHighlight");
    f.text:SetPoint("RIGHT", f, "RIGHT", -2, 6);
    f.text:SetFont(STANDARD_TEXT_FONT, 13);
    f.text:Hide();
    f.targeticon = f:CreateTexture(nil, "OVERLAY");
    f.targeticon:SetPoint("CENTER", f, "TOP", 0, -1);
    f.targeticon:SetWidth(12);
    f.targeticon:SetHeight(12);
    f.targeticon:SetTexture("Interface\\TARGETINGFRAME\\UI-RaidTargetingIcons");
    f.targeticon:Hide();
    -- Use Blizzard Alt Power Bar
    local powerbar = _G[format("Boss%iTargetFramePowerBarAlt", string.sub(unit, 5, 5))];
    powerbar:SetParent(f);
    powerbar:ClearAllPoints();
    powerbar:SetPoint("RIGHT", f, "LEFT");

    RegisterUnitWatch(f);
    f:Show();
    return f;
end

CFrame:SetScript("OnEvent", function(self)
    self:UnregisterAllEvents();
    CFrame:SetFrameStrata("LOW");
    CFrame:SetPoint("CENTER", nil, "CENTER");
    CFrame:SetWidth(2);
    CFrame:SetHeight(2);
    for i =1,MAX_BOSS_FRAMES do
        initBoss(self, -(i*36), 160, 32, addon.FrameUpdate, addon.UnitEvent);
    end
end);
CFrame:RegisterEvent("PLAYER_LOGIN");