--- RinneScript Neovim plugin — native LSP integration.
---
--- Usage:
---   require('rinne').setup({ bin = '/path/to/rinne' })
---   -- or just require('rinne') — resolves bin from g:rinne_path or PATH.
local M = {}

local function find_bin(opts)
  local bin = opts.bin or vim.g.rinne_path or 'rinne'

  -- Resolve to absolute path; if it contains a slash, treat as explicit path.
  if bin:find('/') then
    if vim.fn.executable(bin) == 1 then
      return bin
    end
    error(('rinne LSP binary not found or not executable: %s'):format(bin))
  end

  -- Bare name: search PATH.
  local resolved = vim.fn.executable(bin)
  if resolved == 1 then
    return bin
  end
  error(
    ('rinne LSP binary %q not found on PATH. '
      .. 'Set g:rinne_path or pass opts.bin to require("rinne").setup().'):format(bin)
  )
end

--- Configure and enable the RinneScript LSP client.
--- Never throws for a missing binary: warns once and leaves startup intact
--- (the editor must not break when the server isn't installed yet).
--- @param opts? {bin?: string}
function M.setup(opts)
  opts = opts or {}
  local ok, bin = pcall(find_bin, opts)
  if not ok then
    vim.notify(tostring(bin), vim.log.levels.WARN, { title = 'rinne.nvim' })
    return M
  end

  vim.lsp.config('rinne', {
    cmd = { bin, 'lsp' },
    filetypes = { 'rinne' },
    root_markers = { 'build.zig.zon', '.git' },
  })

  vim.lsp.enable('rinne')
  return M
end

return M