local lsp = require("lsp-zero")
local lsp_config = require('lspconfig')

lsp.preset("recommended")

lsp.ensure_installed({
  dart
})

-- set client offset encoding for clang
lsp.configure('clangd', {
  init_options = {
    offsetEncoding = { "utf-8" }
  },
  -- ignore protobuf files
  filetypes = { "c", "cpp", "objc", "objcpp", "hpp" },
})

-- Fix Undefined global 'vim'
lsp.configure('sumneko_lua', {
  settings = {
    Lua = {
      diagnostics = {
        globals = { 'vim' }
      }
    }
  }
})

local cmp = require('cmp')
local cmp_select = { behavior = cmp.SelectBehavior.Select }
local cmp_mappings = lsp.defaults.cmp_mappings({
  ['<C-p>'] = cmp.mapping.select_prev_item(cmp_select),
  ['<C-n>'] = cmp.mapping.select_next_item(cmp_select),
  ['<C-y>'] = cmp.mapping.confirm({ select = true }),
  ["<C-Space>"] = cmp.mapping.complete(),
})

cmp_mappings['<Tab>'] = nil
cmp_mappings['<S-Tab>'] = nil

lsp.setup_nvim_cmp({
  mapping = cmp_mappings
})

lsp.set_preferences({
  suggest_lsp_servers = true,
  sign_icons = {
    error = 'E',
    warn = 'W',
    hint = 'H',
    info = 'I'
  }
})

local on_attach = function(client, bufnr)
  local opts = { buffer = bufnr, remap = false }

  vim.keymap.set("n", "gd", function() vim.lsp.buf.definition() end, opts)
  vim.keymap.set("n", "K", function() vim.lsp.buf.hover() end, opts)
  vim.keymap.set("n", "<leader>vws", function() vim.lsp.buf.workspace_symbol() end, opts)
  vim.keymap.set("n", "<leader>lg", function() vim.diagnostic.open_float() end, opts)
  vim.keymap.set("n", "[d", function() vim.diagnostic.goto_next() end, opts)
  vim.keymap.set("n", "]d", function() vim.diagnostic.goto_prev() end, opts)
  vim.keymap.set("n", "<leader>la", function() vim.lsp.buf.code_action() end, opts)
  vim.keymap.set("n", "<leader>lf", function() vim.lsp.buf.format() end, opts)
  vim.keymap.set("n", "<leader>gr", function() vim.lsp.buf.references() end, opts)
  vim.keymap.set("n", "<leader>vrn", function() vim.lsp.buf.rename() end, opts)
  vim.keymap.set("i", "<C-h>", function() vim.lsp.buf.signature_help() end, opts)
end


lsp.on_attach(on_attach)

lsp_config["dartls"].setup({
  on_attach = on_attach,
  root_dir = lsp_config.util.root_pattern('.git'),
  settings = {
    dart = {
      analysisExcludedFolders = {
        vim.fn.expand("$HOME/AppData/Local/Pub/Cache"),
        vim.fn.expand("$HOME/.pub-cache"),
        vim.fn.expand("/opt/homebrew/"),
        vim.fn.expand("$HOME/tools/flutter/"),
      },
      updateImportsOnRename = true,
      completeFunctionCalls = true,
      showTodos = true,
    }
  },
})

lsp.skip_server_setup({ 'rust_analyzer' })
lsp.setup()

vim.diagnostic.config({
  virtual_text = true,
  update_in_insert = false,
  underline = true,
  severity_sort = false,
  float = true,
})

-- RUST SETUP
local rt = require("rust-tools")

-- Set up lspconfig.
local capabilities = require('cmp_nvim_lsp').default_capabilities()
-- Replace <YOUR_LSP_SERVER> with each lsp server you've enabled.
require('lspconfig')['rust_analyzer'].setup {
  capabilities = capabilities
}

-- Configure LSP through rust-tools.nvim plugin.
-- rust-tools will configure and enable certain LSP features for us.
-- See https://github.com/simrat39/rust-tools.nvim#configuration
rt.setup({
  server = {
    capabilities = capabilities,

    on_attach = function(_, bufnr)
      -- Hover actions
      vim.keymap.set("n", "K", rt.hover_actions.hover_actions, { buffer = bufnr })
      -- Code action groups
      vim.keymap.set("n", "<leader>la", rt.code_action_group.code_action_group, { buffer = bufnr })
      vim.keymap.set("n", "<leader>lg", vim.diagnostic.open_float, { buffer = bufnr })
      vim.keymap.set("n", "<leader>lf", vim.lsp.buf.format, { buffer = bufnr })
    end,

    settings = {
      -- to enable rust-analyzer settings visit:
      -- https://github.com/rust-analyzer/rust-analyzer/blob/master/docs/user/generated_config.adoc
      ["rust-analyzer"] = {
        diagnostics = {
          enable = true,
          experimental = {
            enable = true
          }
        },
        -- -- enable clippy on save
        checkOnSave = {
          command = "clippy",
        },
        cargo = {
          -- to enable include! macro being read
          -- loadOutDirsFromCheck = true,
          buildScripts = {
            -- to enable build scripts being read
            enable = true
          },
        },
      },
    },
  },
})