-- The per-version import metadata (symbol table + ROM hash) that drives
-- RomExtractor.  Split out of RomImporter so the extraction worker thread can
-- decode it itself: shipping the decoded table across a love.thread channel
-- would deep-copy every symbol for nothing.

local GameVersion = require("src.core.GameVersion")

local RomManifest = {}

function RomManifest.decode(version)
  local info = GameVersion.info(version)
  local raw, readError = love.filesystem.read(info.manifest)
  if not raw then
    error("ROM import metadata is missing: " .. tostring(readError))
  end
  local Json = require("src.link.Json")
  local manifest, decodeError = Json.decode(raw)
  if not manifest then
    error("ROM import metadata is invalid: " .. tostring(decodeError))
  end
  assert(manifest.romSha1 == info.sha1, "ROM import metadata version mismatch")
  return manifest
end

return RomManifest