importer for skins now w file picker

tests/engine/skin_import_picker_test.lua

@@ -0,0 +1,118 @@
+-- Skins tab Import button: picker plumbing + path/drop install (SKINIMP-01..05).
+package.path = "./?.lua;./?/init.lua;" .. package.path
+if not _G.love then _G.love = require("tests.love_stub") end
+
+local S = require("tests.harness").suite("skin import picker")
+local eq = S.eq
+local check = S.check
+
+local RomImporter = require("src.import.RomImporter")
+local TouchSkin = require("src.core.TouchSkin")
+
+love.system = love.system or {}
+local saved = {
+  pickFile = love.system.pickFile,
+  getPickedFile = love.system.getPickedFile,
+  getPickError = love.system.getPickError,
+  installArchive = TouchSkin.installArchive,
+}
+
+local installed
+TouchSkin.installArchive = function(name, data)
+  installed = { name = name, data = data }
+  if not data or data == "" then return nil, "empty archive" end
+  return (name:match("([^/\\]+)$") or name):gsub("%.[Zz][Ii][Pp]$", "")
+end
+
+local function freshImporter(fields)
+  local imp = RomImporter.new(function() end, { launcher = true })
+  imp.tab = "skins"
+  imp._skins = {}
+  imp._ensureSkins = function(self) return self._skins end
+  for k, v in pairs(fields or {}) do imp[k] = v end
+  return imp
+end
+
+-- SKINIMP-01: a picker path installs as a skin, not a mod
+installed = nil
+local imp = freshImporter()
+local tmp = os.tmpname() .. ".zip"
+local f = assert(io.open(tmp, "wb"))
+f:write("PK\3\4skin-archive")
+f:close()
+imp:_installSkinZip(tmp)
+os.remove(tmp)
+check(installed ~= nil, "an absolute picker path reaches TouchSkin.installArchive")
+eq(installed.data, "PK\3\4skin-archive", "the picked file's bytes are installed")
+check(imp._skinNotice and imp._skinNotice.ok, "a good pick reports success")
+
+-- SKINIMP-02: a dropped file still installs, and both paths land on the tab
+installed = nil
+imp = freshImporter({ tab = "red" })
+imp:filedropped({
+  getFilename = function() return "/tmp/dropped_skin.zip" end,
+  getSize = function() return 4 end,
+  open = function() return true end,
+  read = function() return "PKZP" end,
+  close = function() return true end,
+})
+check(installed == nil, "a zip dropped off the skins tab is still a mod")
+installed = nil
+imp = freshImporter()
+imp:filedropped({
+  getFilename = function() return "/tmp/dropped_skin.zip" end,
+  getSize = function() return 4 end,
+  open = function() return true end,
+  read = function() return "PKZP" end,
+  close = function() return true end,
+})
+eq(installed and installed.name, "/tmp/dropped_skin.zip",
+  "a zip dropped on the skins tab installs as a skin")
+eq(imp.tab, "skins", "the skin install stays on the skins tab")
+
+-- SKINIMP-03: the mobile bridge borrows the mod picker kind
+local requestedKind
+love.system.pickFile = function(kind)
+  requestedKind = kind
+  return true
+end
+love.system.getPickedFile = function() return nil end
+love.system.getPickError = function() return nil end
+imp = freshImporter({ nativePicker = true })
+imp:chooseSkin()
+eq(requestedKind, "mod", "chooseSkin opens the .zip picker")
+eq(imp.pickerPendingKind, "skin", "the pending pick is routed to the skins tab")
+
+-- SKINIMP-04: the picked file comes back through update() as a skin
+installed = nil
+love.system.getPickedFile = function()
+  love.system.getPickedFile = function() return nil end
+  return "/picked/from_bridge.zip"
+end
+imp._installSkinZip = function(self, source)
+  self.installedSource = source
+  self._skinNotice = { ok = true, text = "Imported from_bridge" }
+end
+imp:update(0)
+eq(imp.installedSource, "/picked/from_bridge.zip",
+  "update() hands the picked path to the skin installer")
+eq(imp.pickerPendingKind, nil, "the pending kind clears once consumed")
+
+-- SKINIMP-05: a picker error lands on the skins notice, not the mods one
+love.system.getPickedFile = function() return nil end
+love.system.getPickError = function()
+  love.system.getPickError = function() return nil end
+  return "picker refused"
+end
+imp = freshImporter({ nativePicker = true, pickerPendingKind = "skin" })
+imp:update(0)
+check(imp._skinNotice and not imp._skinNotice.ok,
+  "a failed skin pick reports on the skins tab")
+eq(imp.modNotice, nil, "a failed skin pick leaves the mods notice alone")
+
+love.system.pickFile = saved.pickFile
+love.system.getPickedFile = saved.getPickedFile
+love.system.getPickError = saved.getPickError
+TouchSkin.installArchive = saved.installArchive
+
+S.finish()