local nvim_lsp = require('lspconfig')
local on_attach = function(client, bufnr)
  -- TODO: use vim.api.nvim_create_autocmd
  vim.api.nvim_exec2([[autocmd User LspDiagnosticsChanged call lightline#update()]], { output = false })

  local opts = { noremap=true, silent=false }
  vim.api.nvim_buf_set_keymap(bufnr, 'n', 'gd', '<Cmd>lua vim.lsp.buf.definition()<CR>', opts)
  vim.api.nvim_buf_set_keymap(bufnr, 'n', 'gD', '<Cmd>lua vim.lsp.buf.type_definition()<CR>', opts)
  vim.api.nvim_buf_set_keymap(bufnr, 'n', '<leader>gd', '<Cmd>lua vim.lsp.buf.definition()<CR>', opts)
  vim.api.nvim_buf_set_keymap(bufnr, 'n', '<leader>gD', '<Cmd>lua vim.lsp.buf.type_definition()<CR>', opts)
  vim.api.nvim_buf_set_keymap(bufnr, 'n', '<leader>e', '<Cmd>lua vim.lsp.buf.rename()<CR>', opts)
  vim.api.nvim_buf_set_keymap(bufnr, 'n', '<leader>r', '<Cmd>lua vim.lsp.buf.references()<CR>', opts)
  vim.api.nvim_buf_set_keymap(bufnr, 'n', '<leader>i', '<Cmd>lua vim.lsp.buf.implementation()<CR>', opts)
  vim.api.nvim_buf_set_keymap(bufnr, 'n', '<leader>ca', '<Cmd>lua vim.lsp.buf.code_action()<CR>', opts)
  vim.api.nvim_buf_set_keymap(bufnr, 'n', '<leader>ci', '<Cmd>lua vim.lsp.buf.incoming_calls()<CR>', opts)
  vim.api.nvim_buf_set_keymap(bufnr, 'n', '<leader>co', '<Cmd>lua vim.lsp.buf.outgoing_calls()<CR>', opts)
  vim.api.nvim_buf_set_keymap(bufnr, 'n', 'K', '<Cmd>lua vim.lsp.buf.hover()<CR>', opts)
  vim.api.nvim_buf_set_keymap(bufnr, 'n', ']e', '<Cmd>lua vim.diagnostic.goto_next({severity="Error"})<CR>', opts)
  vim.api.nvim_buf_set_keymap(bufnr, 'n', '[e', '<Cmd>lua vim.diagnostic.goto_prev({severity="Error"})<CR>', opts)
  vim.api.nvim_buf_set_keymap(bufnr, 'n', ']d', '<Cmd>lua vim.diagnostic.goto_next()<CR>', opts)
  vim.api.nvim_buf_set_keymap(bufnr, 'n', '[d', '<Cmd>lua vim.diagnostic.goto_prev()<CR>', opts)
  vim.api.nvim_buf_set_keymap(bufnr, 'n', 'cd', '<Cmd>lua vim.diagnostic.hide(nil, 0)<CR>', opts)

  -- fzf triggers:
  vim.api.nvim_buf_set_keymap(bufnr, 'n', '<leader>fr', '<Cmd>References<CR>', opts)
  vim.api.nvim_buf_set_keymap(bufnr, 'n', '<leader>fi', '<Cmd>Implementations<CR>', opts)
  vim.api.nvim_buf_set_keymap(bufnr, 'n', '<leader>fs', '<Cmd>DocumentSymbols<CR>', opts)
  vim.api.nvim_buf_set_keymap(bufnr, 'n', '<leader>fw', '<Cmd>WorkspaceSymbols<CR>', opts)
  vim.api.nvim_buf_set_keymap(bufnr, 'n', '<leader>fc', '<Cmd>CodeActions<CR>', opts)
  vim.api.nvim_buf_set_keymap(bufnr, 'n', '<leader>fci', '<Cmd>IncomingCalls<CR>', opts)
  vim.api.nvim_buf_set_keymap(bufnr, 'n', '<leader>fco', '<Cmd>OutgoingCalls<CR>', opts)

  require 'lsp_signature'.on_attach({
    hint_enable = false,
  })

  require 'copilot_cmp'.setup();
end

-- Go

local capabilities = require('cmp_nvim_lsp').default_capabilities()
capabilities.textDocument.completion.completionItem.snippetSupport = true
capabilities.textDocument.completion.completionItem.resolveSupport = {
  properties = {
    'documentation',
    'detail',
    'additionalTextEdits',
  }
}

nvim_lsp.gopls.setup{
  settings = {
    gopls = {
      staticcheck = true,
      -- Disalbing linksInHover may not be working as expected:
      linksInHover = false,
      usePlaceholders = true,
      analyses = {
        unusedparams = true,
        shadow = true,
        unusedwrite = true,
        unusedresult = true,
        nilness = true,
      },
    },
  },
  capabilities = capabilities,
  on_attach = on_attach,
}

-- Rust
nvim_lsp.rust_analyzer.setup{
  capabilities = capabilities,
  on_attach = on_attach,
    settings = {
        ["rust-analyzer"] = {
            imports = {
                granularity = {
                    group = "module",
                },
                prefix = "self",
            },
            cargo = {
                buildScripts = {
                    enable = true,
                },
            },
            procMacro = {
                enable = false,
            },
            diagnostics = {
              disabled = { "unresolved-proc-macro" },
            }
        }
    }
}

-- Ruby

nvim_lsp.solargraph.setup{
  on_attach = on_attach,
}

-- Typescript
-- https://jose-elias-alvarez.medium.com/configuring-neovims-lsp-client-for-typescript-development-5789d58ea9c

nvim_lsp.tsserver.setup{
  on_attach = on_attach,
}

local filetypes = {
  typescript = "eslint",
  typescriptreact = "eslint",
}

-- diagnosticls

local linters = {
  eslint = {
    sourceName = "eslint",
    -- fallback to global eslint if the local is not found?
    -- https://github.com/creativenull/diagnosticls-configs-nvim/blob/e7d6f7e99f6b416d2aeee89314bc46fc36df7b22/lua/diagnosticls-configs/fs.lua#L20
    command = "./node_modules/.bin/eslint",
    rootPatterns = {".eslintrc", ".eslintrc.js"},
    debounce = 100,
    args = {"--stdin", "--stdin-filename", "%filepath", "--format", "json"},
    parseJson = {
      errorsRoot = "[0].messages",
      line = "line",
      column = "column",
      endLine = "endLine",
      endColumn = "endColumn",
      message = "${message} [${ruleId}]",
      security = "severity"
    },
    securities = {[1] = "error", [2] = "warning"}
  }
}

nvim_lsp.diagnosticls.setup{
  on_attach = on_attach,
  filetypes = vim.tbl_keys(filetypes),
  init_options = {
    linters = linters,
    filetypes = filetypes,
  }
}

-- Lua

local lua_ls_root_path = os.getenv("HOME").."/dev/lua-language-server"
local lua_ls_binary = lua_ls_root_path.."/bin/lua-language-server"

local runtime_path = vim.split(package.path, ';')
table.insert(runtime_path, "lua/?.lua")
table.insert(runtime_path, "lua/?/init.lua")

nvim_lsp.lua_ls.setup {
  cmd = {lua_ls_binary, "-E", lua_ls_root_path .. "/main.lua"};
  settings = {
    Lua = {
      runtime = {
        version = 'LuaJIT',
        path = runtime_path,
      },
      diagnostics = {
        globals = {'vim'},
      },
      workspace = {
        library = vim.api.nvim_get_runtime_file("", true),
      },
      telemetry = {
        enable = false,
      },
    },
  },
  on_attach = on_attach,
}