-- Live placement editing: save a file, watch it change in game.
--
-- Sourced on top of your own config with `-c luafile`, never with `-u`, so
-- nothing here sets an option or steals a mapping - it only adds the reload.
--
-- Saving any module JSON rebuilds the mod, copies it into whichever instance is
-- running, and tells that game to re-read the half of the jar the file belongs
-- to: `/reload` for module placement under `packs/`, F3+T for models and
-- textures under `assets/`. The build is async, so a save never blocks.
--
--   :Reload      rebuild and reload now, without saving
--   :ReloadLog   open the build log after a failure
--   :ReloadOff   stop reloading on save   (:ReloadOn to resume)

local REPO = '/home/themiro/code.dev/create-mekanism-modular'
local SCRIPT = REPO .. '/tools/live-reload.sh'
local running, enabled = false, true

local function reload(file)
  if running then
    vim.notify('[live] a reload is already in flight', vim.log.levels.WARN)
    return
  end
  running = true
  vim.notify('[live] building ' .. vim.fn.fnamemodify(file, ':t') .. ' ...')
  local out = {}
  local function grab(_, d)
    for _, l in ipairs(d or {}) do if l ~= '' then table.insert(out, l) end end
  end
  vim.fn.jobstart({ SCRIPT, file }, {
    stdout_buffered = true, stderr_buffered = true,
    on_stdout = grab, on_stderr = grab,
    on_exit = function(_, code)
      running = false
      local msg = '[live] ' .. table.concat(out, ' | ')
      vim.notify(code == 0 and msg or (msg .. '  (:ReloadLog)'),
                 code == 0 and vim.log.levels.INFO or vim.log.levels.ERROR)
    end,
  })
end

-- Only the files that actually feed placement, so an unrelated save never
-- kicks off a build.
vim.api.nvim_create_autocmd('BufWritePost', {
  group = vim.api.nvim_create_augroup('CmmodularLive', { clear = true }),
  pattern = { REPO .. '/src/main/resources/packs/*.json',
              REPO .. '/src/main/resources/assets/*.json' },
  callback = function(a) if enabled then reload(a.match) end end,
})

vim.api.nvim_create_user_command('Reload', function()
  reload(vim.api.nvim_buf_get_name(0))
end, { desc = 'rebuild, deploy, and reload in game' })
vim.api.nvim_create_user_command('ReloadLog', function()
  vim.cmd('split /tmp/live-reload-build.log')
end, { desc = 'build log from the last live reload' })
vim.api.nvim_create_user_command('ReloadOff', function()
  enabled = false; vim.notify('[live] reload-on-save off')
end, {})
vim.api.nvim_create_user_command('ReloadOn', function()
  enabled = true; vim.notify('[live] reload-on-save on')
end, {})