local media = LibStub:GetLibrary("LibSharedMedia-3.0");
local f = RaidFrameCustomization.frames;
local positions = RaidFrameCustomization.positions;
local pad = 2;
local paddings = {
    TOPLEFT = {pad, -pad},
    TOPRIGHT = {-pad, -pad},
    CENTER = {0, 0},
    BOTTOMLEFT = {pad, pad},
    BOTTOMRIGHT = {-pad, pad}
};
local watchedAuras; -- all watched auras
local auraFilters = {"HELPFUL", "HARMFUL"};
local DEFAULT_ICON = "Interface\\AddOns\\RaidFrameCustomization\\images\\rhomb";
local _;

-- global functions used every update
local GetTime = GetTime;
local UnitAura = UnitAura;
local UnitIsPlayer = UnitIsPlayer;
local UnitIsConnected = UnitIsConnected;
local UnitIsDeadOrGhost = UnitIsDeadOrGhost;
local CompactRaidFrameContainer_ApplyToFrames = CompactRaidFrameContainer_ApplyToFrames;

-- list of important auras TODO try to use spellIDs
local centerAuras = {
    "Power Word: Shield"
};

local function configureIndicators(frame, name)
    local frameName = name or frame:GetName();
    if not f[frameName] then return end

    local config = RaidFrameCustomization.db.profile;
    local font = media and media:Fetch('font', config.indicatorFont) or STANDARD_TEXT_FONT;
    for pos, ind in pairs(f[frameName]) do
        ind.text:SetFont(font, config[pos]["textSize"]);
        ind.text:SetTextColor(unpack(config[pos]["textColor"]));
        ind.icon:SetWidth(config[pos]["iconSize"]);
        ind.icon:SetHeight(config[pos]["iconSize"]);
        ind.icon:SetTexture(DEFAULT_ICON);
        ind.icon:SetVertexColor(unpack(config[pos]["iconColor"]));
        if config[pos]["showIcon"] then
            ind.icon:Show();
        else
            ind.icon:Hide();
        end
    end
end

-- Create the FontStrings used for indicators
local function setupCompactUnitFrame(frame, name)
    f[name] = {};
    for _, pos in ipairs(positions) do
        f[name][pos] = {};
        f[name][pos].text = frame:CreateFontString(nil, "OVERLAY", "GameFontHighlightSmall");
        f[name][pos].text:SetPoint(pos, frame, pos, paddings[pos][1], paddings[pos][2]);
        f[name][pos].icon = frame:CreateTexture(nil, "OVERLAY");
        f[name][pos].icon:SetPoint(pos, frame, pos, paddings[pos][1], paddings[pos][2]);
    end
    configureIndicators(frame, name);
end

-- Check the indicators on a frame and update the times on them
local function updateIndicators(frame)
    local frameName = frame:GetName();
    local unit = frame.unit;

    -- Create indicators if needed
    if not f[frameName] then setupCompactUnitFrame(frame, frameName) end
    -- Reset current
    for _, ind in pairs(f[frameName]) do
        ind.text:SetText("");
        ind.icon:SetTexture("");
    end
    -- Hide if unit is dead/disconnected
    if (not UnitIsConnected(unit)) or UnitIsDeadOrGhost(frame.displayedUnit) then
        return;
    end

    local name, icon, count, debuff, expires, caster, id;
    local current = GetTime();
    for _, filter in ipairs(auraFilters) do
        local i = 1;
        while true do
            name, _, icon, count, debuff, _, expires, caster, _, _, id = UnitAura(unit, i, filter);
            if not id then break end
            local pos = watchedAuras[name] or watchedAuras[id] or watchedAuras[debuff];
            if pos then
                local config = RaidFrameCustomization.db.profile[pos];
                if not config.mine or UnitIsPlayer(caster) then
                    if config.showIcon and not config.useDefaultIcon then
                        -- show icon TODO coloring
                        ind.icon:SetTexture(icon);
                    end
                    if config.showText then
                        -- show text
                        local text;
                        local remaining = expires - current;
                        if remaining > 60 then
                            text = string.format("%dm", ceil(remaining/60));
                        else
                            text = string.format("%d", floor(remaining+0.5));
                        end
                        if count > 1 and config.stack then
                            if text then
                                text = count.."-"..text;
                            else
                                text = count;
                            end
                        end

                        ind.text:SetText(text);
                    end
                end
            end
            i = i + 1;
        end
    end
end

-- Update all indicators
function RaidFrameCustomization:UpdateAllIndicators()
    CompactRaidFrameContainer_ApplyToFrames(CompactRaidFrameContainer, "normal", updateIndicators);
end

-- Used to update everything that is affected by the configuration
function RaidFrameCustomization:RefreshConfig()
    self:OnDisable(); -- clear everything
    if self.db.profile.enabled then
        CompactRaidFrameContainer_ApplyToFrames(CompactRaidFrameContainer, "normal", configureIndicators);
        -- Format aura strings
        watchedAuras = {};
        for _, pos in ipairs(positions) do
            for _, aura in ipairs(self.db.profile[pos]["auras"]) do
                watchedAuras[aura] = pos; -- TODO single aura only in one position
            end
        end

        if next(watchedAuras) ~= nil then
            self.updateTimer = self:ScheduleRepeatingTimer("UpdateAllIndicators", 0.15);
        end
    end
end