-- Mason Setup
require("mason").setup({
    ui = {
        icons = {
            package_installed = "",
            package_pending = "",
            package_uninstalled = "",
        },
    }
})
require("mason-lspconfig").setup({
    ensure_installed = { "rust_analyzer", "tsserver", "clangd", "intelephense", "pyright", "ltex", "jdtls" }
})
require("mason-lspconfig").setup_handlers {
    function (server_name) -- default handler (optional)
        require("lspconfig")[server_name].setup {}
    end,

    ["rust_analyzer"] = function ()
        require("rust-tools").setup {}
    end
}

-- LSP Diagnostics Options Setup
local sign = function(opts)
  vim.fn.sign_define(opts.name, {
    texthl = opts.name,
    text = opts.text,
    numhl = ''
  })
end

sign({name = 'DiagnosticSignError', text = ''})
sign({name = 'DiagnosticSignWarn', text = ''})
sign({name = 'DiagnosticSignHint', text = ''})
sign({name = 'DiagnosticSignInfo', text = ''})

vim.diagnostic.config({
    virtual_text = false,
    signs = true,
    update_in_insert = true,
    underline = true,
    severity_sort = false,
    float = {
        border = 'rounded',
        source = 'always',
        header = '',
        prefix = '',
    },
})

vim.cmd([[
set signcolumn=yes
autocmd CursorHold * lua vim.diagnostic.open_float(nil, { focusable = false })
]])

--Set completeopt to have a better completion experience
-- :help completeopt
-- menuone: popup even when there's only one match
-- noinsert: Do not insert text until a selection is made
-- noselect: Do not select, force to select one from the menu
-- shortness: avoid showing extra messages when using completion
-- updatetime: set updatetime for CursorHold
vim.opt.completeopt = {'menuone', 'noselect', 'noinsert'}
vim.opt.shortmess = vim.opt.shortmess + { c = true}
vim.api.nvim_set_option('updatetime', 300)

-- Fixed column for diagnostics to appear
-- Show autodiagnostic popup on cursor hover_range
-- Goto previous / next diagnostic warning / error
-- Show inlay_hints more frequently
vim.cmd([[
set signcolumn=yes
autocmd CursorHold * lua vim.diagnostic.open_float(nil, { focusable = false })
]])

-- Completion Plugin Setup
local cmp = require'cmp'
cmp.setup({
  -- Enable LSP snippets
  snippet = {
    expand = function(args)
        vim.fn["vsnip#anonymous"](args.body)
    end,
  },
  mapping = {
    ['<C-p>'] = cmp.mapping.select_prev_item(),
    ['<C-n>'] = cmp.mapping.select_next_item(),
    -- Add tab support
    ['<S-Tab>'] = cmp.mapping.select_prev_item(),
    ['<Tab>'] = cmp.mapping.select_next_item(),
    ['<C-S-f>'] = cmp.mapping.scroll_docs(-4),
    ['<C-f>'] = cmp.mapping.scroll_docs(4),
    ['<C-Space>'] = cmp.mapping.complete(),
    ['<C-e>'] = cmp.mapping.close(),
    ['<CR>'] = cmp.mapping.confirm({
      behavior = cmp.ConfirmBehavior.Insert,
      select = true,
    })
  },
  -- Installed sources:
  sources = {
    { name = 'path' },                              -- file paths
    { name = 'nvim_lsp', keyword_length = 3 },      -- from language server
    { name = 'nvim_lsp_signature_help'},            -- display function signatures with current parameter emphasized
    { name = 'nvim_lua', keyword_length = 2},       -- complete neovim's Lua runtime API such vim.lsp.*
    { name = 'buffer', keyword_length = 2 },        -- source current buffer
    { name = 'vsnip', keyword_length = 2 },         -- nvim-cmp source for vim-vsnip
    { name = 'calc'},                               -- source for math calculation
  },
  window = {
      completion = cmp.config.window.bordered(),
      documentation = cmp.config.window.bordered(),
  },
  formatting = {
      fields = {'menu', 'abbr', 'kind'},
      format = function(entry, item)
          local menu_icon ={
              nvim_lsp = 'λ',
              vsnip = '⋗',
              buffer = 'Ω',
              path = '🖫',
          }
          item.menu = menu_icon[entry.source.name]
          return item
      end,
  },
})