local util = require('user.util')

vim.diagnostic.config({
  -- only show virtual text for WARN and higher
  virtual_text = { severity = { min = vim.diagnostic.severity.WARN } },
})

vim.lsp.config('*', {
  flags = {
    debounce_text_changes = 250,
  }
})

vim.lsp.enable('bashls');
vim.lsp.enable('eslint');

if vim.fn.executable('dprint') == 1 then
  local version = vim.version.parse(vim.fn.system('dprint --version'))
  if vim.version.cmp(version, { 0, 45, 0 }) >= 0 then
    vim.lsp.enable('dprint')
  end
end

if vim.fn.executable('deno') == 1 then
  vim.lsp.enable('deno');
else
  local preferences = {
    importModuleSpecifierPreference = 'non-relative',
    -- this prevents renames from aliasing when destructuring
    providePrefixAndSuffixTextForRename = false,
  }

  local helix_preferences = vim.tbl_get(
    util.read_helix_config(),
    'language-server',
    'typescript-language-server',
    'config',
    'preferences'
  )
  if helix_preferences ~= nil then
    preferences = vim.tbl_deep_extend('force', preferences, helix_preferences)
  end

  local function make_settings()
    -- we disable formatting but these are still used when performing some code
    -- actions
    local format = {
      indentSize = vim.bo.shiftwidth,
      convertTabsToSpaces = vim.o.expandtab,
    }
    return {
      javascript = { format = format },
      typescript = { format = format },
    }
  end

  vim.lsp.config('ts_ls', {
    init_options = {
      completionDisableFilterText = true,
      preferences = preferences,
    },
    settings = make_settings(),
    handlers = {
      ['$/typescriptVersion'] = function(err, result, ctx, config)
        vim.notify(string.format('Typescript %s', result.version))
      end,
    },
    on_init = function(client)
      -- mark tsserver as not having formatting available as we rely on
      -- eslint and dprint for that
      client.server_capabilities.documentFormattingProvider = false
      client.server_capabilities.documentRangeFormattingProvider = false

      -- we only really know our settings once we've opened a file so report
      -- the new formatting settings
      client:notify(vim.lsp.protocol.Methods.workspace_didChangeConfiguration, {
        settings = make_settings(),
      })
    end,
  })
  vim.lsp.enable('ts_ls')
end

vim.lsp.enable('gopls')

vim.lsp.config('ruby_lsp', {
  init_options = {
    enabledFeatures = {
      formatting = false,
    },
  }
})
vim.lsp.enable('ruby_lsp')

vim.lsp.enable('nil_ls')

vim.lsp.config('jdtls', {
  handlers = {
    ['$/progress'] = function()
      -- this is quite noisy so just disable it
    end
  },
})
vim.lsp.enable('jdtls')

vim.lsp.enable('lua_ls')

-- custom LSP servers
vim.lsp.config('elvish', {
  cmd = { 'elvish', '--lsp' },
  filetypes = { 'elvish' },
  settings = {},
})
vim.lsp.enable('elvish')

-- diagnostics
vim.keymap.set('n', '<space>e', function() vim.diagnostic.open_float() end)
vim.keymap.set('n', '[d',
  function() vim.diagnostic.jump({ count = -1, float = true, severity = vim.diagnostic.severity.ERROR }) end)
vim.keymap.set('n', ']d',
  function() vim.diagnostic.jump({ count = 1, float = true, severity = vim.diagnostic.severity.ERROR }) end)
vim.keymap.set('n', '[D', function() vim.diagnostic.jump({ count = -1, float = true }) end)
vim.keymap.set('n', ']D', function() vim.diagnostic.jump({ count = 1, float = true }) end)
vim.keymap.set('n', '<space>qe', function() vim.diagnostic.setqflist({ severity = vim.diagnostic.severity.ERROR }) end)
vim.keymap.set('n', '<space>qw',
  function() vim.diagnostic.setqflist({ severity = { min = vim.diagnostic.severity.WARN } }) end)
vim.keymap.set('n', '<space>qd', function() vim.diagnostic.setqflist({}) end)
vim.keymap.set('n', '<space>qc', '<cmd>cclose<CR>')

-- LSP-specific
vim.api.nvim_create_autocmd('LspAttach', {
  callback = function(args)
    local client = vim.lsp.get_client_by_id(args.data.client_id)

    if client.name == 'dprint' or client.name == 'eslint' then
      -- mappings should have been attached by typescript and re-attaching can
      -- overwrite the typescript specific overrides
      return
    end

    local opts = { buffer = args.buf }

    vim.keymap.set('n', 'gD', '<cmd>lua vim.lsp.buf.declaration()<CR>', opts)
    vim.keymap.set('n', 'gd', '<cmd>Telescope lsp_definitions<CR>', opts)
    vim.keymap.set('n', '<space>D', '<cmd>Telescope lsp_type_definitions<CR>', opts)
    -- as much as possible we try to use the default bindings, replacing them
    -- with Telescope if appropriate
    vim.keymap.set('n', 'gri', '<cmd>Telescope lsp_implementations<CR>', opts)
    vim.keymap.set('n', 'grr', '<cmd>Telescope lsp_references<CR>', opts)
    vim.keymap.set('n', 'gO', '<cmd>Telescope lsp_document_symbols<CR>', opts)

    if client.name == 'ts_ls' then
      -- exclude import statements from reference search (may have false positives)
      vim.keymap.set('n', 'grr', '<cmd>Telescope lsp_references default_text=!import\\ <CR>', opts)
      vim.keymap.set('n', 'grA', '<cmd>LspTypescriptSourceAction<CR>', opts)
    end
  end,
})

-- handle file renames
vim.api.nvim_create_autocmd('User', {
  pattern = 'MiniFilesActionRename',
  callback = function(opts)
    local params = {
      files = { {
        oldUri = vim.uri_from_fname(opts.data.from),
        newUri = vim.uri_from_fname(opts.data.to),
      } }
    }
    local bufnr = vim.fn.bufadd(opts.data.to)

    local clients = vim.lsp.get_clients({ bufnr = bufnr })
    for _, client in ipairs(clients) do
      if client:supports_method('workspace/willRenameFiles') then
        local resp = client:request_sync('workspace/willRenameFiles', params, 5000, bufnr)
        if resp and resp.result ~= nil then
          vim.lsp.util.apply_workspace_edit(resp.result, client.offset_encoding)
        end
      end
    end

    for _, client in ipairs(clients) do
      if client:supports_method('workspace/didRenameFiles') then
        client:notify('workspace/didRenameFiles', params)
      end
    end
  end,
  nested = true,
})