local fs = require('muwiki.fs')

local M = {}

local function command_exists(cmd)
  if type(cmd) == 'function' then
    return true
  end
  return vim.fn.executable(cmd) == 1
end

M.check = function()
  vim.health.start('Wiki Setup')

  local ok, config = pcall(require, 'muwiki.config')
  if not ok then
    vim.health.error('Failed to load muwiki.config module')
    return
  end

  local cfg = config.options

  if not cfg.dirs or #cfg.dirs == 0 then
    vim.health.error('No wiki directories configured')
    vim.health.info('Add to your config: dirs = {{name = "default", path = "~/wiki"}}')
  else
    for _, dir in ipairs(cfg.dirs) do
      if fs.dir_exists(dir.path) then
        vim.health.ok(string.format("Wiki '%s': %s", dir.name, dir.path))
      else
        vim.health.warn(string.format("Wiki '%s': %s (not found)", dir.name, dir.path))
      end
    end
  end

  vim.health.start('External Handlers')

  if cfg.use_external_handlers then
    vim.health.ok('External handlers are enabled')

    for _, handler in ipairs(cfg.external_handlers) do
      if type(handler.cmd) == 'function' then
        vim.health.ok(string.format("Handler '%s': <Lua function>", handler.name))
      elseif command_exists(handler.cmd) then
        vim.health.ok(string.format("Handler '%s': %s", handler.name, handler.cmd))
      else
        vim.health.error(
          string.format("Handler '%s': command not found (%s)", handler.name, handler.cmd)
        )
      end
    end
  else
    vim.health.info('External handlers are disabled')
  end

  vim.health.start('Treesitter (Required)')

  local has_ts_parser = pcall(vim.treesitter.get_parser, 0, 'markdown')
  if has_ts_parser then
    vim.health.ok('Treesitter markdown parser is installed')
  else
    vim.health.error('Treesitter markdown parser not installed')
    vim.health.info('Install with: :TSInstall markdown')
    vim.health.info('Link detection requires treesitter')
  end
end

return M