local M = {}

-- lsp_signature
M.signature = function()
   cfg = {
      Gse_lspsaga = true
   }
end

-- lspinstall
M.lspinstall = function()
   local function setup_servers()
      require'lspinstall'.setup()
      local servers = require'lspinstall'.installed_servers()
      for _, server in pairs(servers) do
         require'lspconfig'[server].setup{}
      end
   end

   setup_servers()

   -- Automatically reload after `:LspInstall <server>` so we don't have to restart neovim
   require'lspinstall'.post_install_hook = function ()
      setup_servers() -- reload installed servers
      vim.cmd("bufdo e") -- this triggers the FileType autocmd that starts the server
   end
end

-- treesitter
M.treesitter = function ()
   require'nvim-treesitter.configs'.setup {
      ensure_installed = "maintained", -- one of "all", "maintained" (parsers with maintainers), or a list of languages
      --ignore_install = { "javascript", "java" }, -- List of parsers to ignore installing
      highlight = {
         enable = true,                     -- false will disable the whole extension
         -- disable = { "c", "rust" },   -- list of language that will be disabled
         -- Setting this to true will run `:h syntax` and tree-sitter at the same time.
         -- Set this to `true` if you depend on 'syntax' being enabled (like for indentation).
         -- Using this option may slow down your editor, and you may see some duplicate highlights.
         -- Instead of true it can also be a list of languages
         additional_vim_regex_highlighting = false,
      },
      indent = {
         enable = true
      }
   }
end

-- lspkind
M.lspkind = function()
   require('lspkind').init({
      -- enables text annotations
      --
      -- default: true
      with_text = true,

      -- default symbol map
      -- can be either 'default' (requires nerd-fonts font) or
      -- 'codicons' for codicon preset (requires vscode-codicons font)
      --
      -- default: 'default'
      preset = 'codicons',

      -- override preset symbols
      --
      -- default: {}
      symbol_map = {
         Text = "",
         Method = "",
         Function = "",
         Constructor = "",
         Field = "ﰠ",
         Variable = "",
         Class = "ﴯ",
         Interface = "",
         Module = "",
         Property = "ﰠ",
         Unit = "塞",
         Value = "",
         Enum = "",
         Keyword = "",
         Snippet = "",
         Color = "",
         File = "",
         Reference = "",
         Folder = "",
         EnumMember = "",
         Constant = "",
         Struct = "פּ",
         Event = "",
         Operator = "",
         TypeParameter = ""
      },
   })
end

-- lspconfig
M.lspconfig = function()
   local nvim_lsp = require('lspconfig')

   -- Use an on_attach function to only map the following keys
   -- after the language server attaches to the current buffer
   local on_attach = function(client, bufnr)
      local function buf_set_keymap(...) vim.api.nvim_buf_set_keymap(bufnr, ...) end
      local function buf_set_option(...) vim.api.nvim_buf_set_option(bufnr, ...) end

      -- Enable completion triggered by <c-x><c-o>
      buf_set_option('omnifunc', 'v:lua.vim.lsp.omnifunc')

      -- Mappings.
      local opts = { noremap=true, silent=true }

      -- See `:help vim.lsp.*` for documentation on any of the below functions
      buf_set_keymap('n', 'gD', '<cmd>lua vim.lsp.buf.declaration()<CR>', opts)
      buf_set_keymap('n', 'gd', '<cmd>lua vim.lsp.buf.definition()<CR>', opts)
      buf_set_keymap('n', 'K', '<cmd>lua vim.lsp.buf.hover()<CR>', opts)
      buf_set_keymap('n', 'gi', '<cmd>lua vim.lsp.buf.implementation()<CR>', opts)
      buf_set_keymap('n', '<C-k>', '<cmd>lua vim.lsp.buf.signature_help()<CR>', opts)
      buf_set_keymap('n', '<space>wa', '<cmd>lua vim.lsp.buf.add_workspace_folder()<CR>', opts)
      buf_set_keymap('n', '<space>wr', '<cmd>lua vim.lsp.buf.remove_workspace_folder()<CR>', opts)
      buf_set_keymap('n', '<space>wl', '<cmd>lua print(vim.inspect(vim.lsp.buf.list_workspace_folders()))<CR>', opts)
      buf_set_keymap('n', '<space>D', '<cmd>lua vim.lsp.buf.type_definition()<CR>', opts)
      buf_set_keymap('n', '<space>rn', '<cmd>lua vim.lsp.buf.rename()<CR>', opts)
      buf_set_keymap('n', '<space>ca', '<cmd>lua vim.lsp.buf.code_action()<CR>', opts)
      buf_set_keymap('n', 'gr', '<cmd>lua vim.lsp.buf.references()<CR>', opts)
      buf_set_keymap('n', '<space>e', '<cmd>lua vim.lsp.diagnostic.show_line_diagnostics()<CR>', opts)
      buf_set_keymap('n', '[d', '<cmd>lua vim.lsp.diagnostic.goto_prev()<CR>', opts)
      buf_set_keymap('n', ']d', '<cmd>lua vim.lsp.diagnostic.goto_next()<CR>', opts)
      buf_set_keymap('n', '<space>q', '<cmd>lua vim.lsp.diagnostic.set_loclist()<CR>', opts)
      buf_set_keymap('n', '<space>f', '<cmd>lua vim.lsp.buf.formatting()<CR>', opts)

   end

   -- Use a loop to conveniently call 'setup' on multiple servers and
   -- map buffer local keybindings when the language server attaches
   local servers = { 'pyright', 'rust_analyzer', 'tsserver' }
   for _, lsp in ipairs(servers) do
      nvim_lsp[lsp].setup {
         on_attach = on_attach,
         flags = {
            debounce_text_changes = 150,
         }
      }
   end
end

return M

-- vim:expandtab:tabstop=3:sw=3