local T = ShaguTweaks.T

local module = ShaguTweaks:register({
  title = T["Enlarged Minimap"],
  description = T["Increases the minimap size and shifts buff icons left to prevent overlap."],
  expansions = { ["vanilla"] = true },
  category = T["Minimap & World Map"],
  enabled = false,
  order = 73,
  config = {
    ["minimap.scale"] = 1.2,
  }
})

local function EnsurePoint(frame, point, relativeTo, relativePoint, x, y)
  if not frame then return end

  local currentPoint, currentRelative, currentRelativePoint, currentX, currentY = frame:GetPoint(1)
  if currentPoint == point and currentRelative == relativeTo
    and currentRelativePoint == relativePoint and currentX == x and currentY == y then
    return
  end

  frame:ClearAllPoints()
  frame:SetPoint(point, relativeTo, relativePoint, x, y)
end

local function GetMoverState(group)
  local state = ShaguTweaks.MovableUnitFramesState
  if not state then return false, false end

  local manual = state.manual and state.manual[group] and true or false
  local dragging = state.dragging and state.dragging[group] and true or false
  return manual, dragging
end

local function GetMovedPosition(key)
  local config = ShaguTweaks_config and ShaguTweaks_config["MoveUnitframes"]
  return config and config[key]
end

local function EnsureMovedPosition(frame, key)
  local pos = GetMovedPosition(key)
  if not frame or not pos or not pos[1] or not pos[2] then return end

  EnsurePoint(frame, "TOPLEFT", UIParent, "BOTTOMLEFT", pos[1], pos[2])
end

module.enable = function(self)
  local scale = module.config["minimap.scale"]
  if scale < 1.0 then scale = 1.0 end
  if scale > 2.0 then scale = 2.0 end

  MinimapCluster:SetScale(scale)

  -- BuffFrame is anchored to UIParent TOPRIGHT/TOPRIGHT x=-205 y=-13 by vanilla.
  -- The C engine can restore these anchors after aura layout updates, so keep a
  -- lightweight per-frame verifier and only write when an anchor actually moved.
  local extra = MinimapCluster:GetWidth() * (scale - 1.0)
  local targetX = -205 - extra
  local targetY = -13

  -- BuffButton16 is the anchor for the player debuff row in vanilla 1.12.
  local debuffX = -205 - extra
  local debuffY = -13 - 70

  -- BuffButton8 ends the top buff row and can overlap an enlarged minimap.
  local buffRowX = -205 - extra
  local buffRowY = debuffY + 26

  -- Reuse a single verifier if enable() is called again. This prevents stacked
  -- OnUpdate frames from fighting over the same anchors.
  if not self.enforcer then
    self.enforcer = CreateFrame("Frame")
  end
  local enforcer = self.enforcer

  enforcer:SetScript("OnUpdate", function()
    local buffsManual, buffsDragging = GetMoverState("buffs")
    local debuffsManual, debuffsDragging = GetMoverState("debuffs")
    local weaponManual, weaponDragging = GetMoverState("weapon")

    -- Manually moved aura groups always win. While a group is actively being
    -- dragged, do not write any anchor for it; once released, enforce the
    -- saved user position instead of the Enlarged Minimap default.
    if buffsManual then
      if not buffsDragging then
        EnsureMovedPosition(BuffButton0, "BuffButton0")
      end
    else
      EnsurePoint(BuffFrame, "TOPRIGHT", UIParent, "TOPRIGHT", targetX, targetY)

      if BuffButton8 then
        EnsurePoint(BuffButton8, "TOPRIGHT", UIParent, "TOPRIGHT", buffRowX, buffRowY)
      end
    end

    if debuffsManual then
      if not debuffsDragging then
        EnsureMovedPosition(BuffButton32, "BuffButton32")
      end
    elseif BuffButton16 then
      EnsurePoint(BuffButton16, "TOPRIGHT", UIParent, "TOPRIGHT", debuffX, debuffY)
    end

    if weaponManual then
      if not weaponDragging then
        EnsureMovedPosition(TempEnchant1, "TempEnchant1")

        if TempEnchant2 and TempEnchant1 then
          EnsurePoint(TempEnchant2, "TOP", TempEnchant1, "BOTTOM", 0, -2)
        end
      end
    else
      -- Temporary enchant buttons are also restored by the stock aura layout.
      -- Verify their anchors like the buff rows instead of clearing and setting
      -- them unconditionally every frame.
      if TempEnchant1 then
        EnsurePoint(TempEnchant1, "TOPLEFT", BuffFrame, "TOPRIGHT", 5, 0)
      end

      if TempEnchant2 and TempEnchant1 then
        EnsurePoint(TempEnchant2, "TOP", TempEnchant1, "BOTTOM", 0, -2)
      end
    end
  end)
end

module.disable = function(self)
  if self.enforcer then
    self.enforcer:SetScript("OnUpdate", nil)
  end
end