-- Install packer
local install_path = vim.fn.stdpath("data") .. "/site/pack/packer/start/packer.nvim"
local is_bootstrap = false
if vim.fn.empty(vim.fn.glob(install_path)) > 0 then
  is_bootstrap = true
  vim.fn.system({ "git", "clone", "--depth", "1", "https://github.com/wbthomason/packer.nvim", install_path })
  vim.cmd([[packadd packer.nvim]])
end

require("packer").startup(function(use)
  -- Package manager
  use("wbthomason/packer.nvim")

  use({ -- LSP Configuration & Plugins
    "neovim/nvim-lspconfig",
    requires = {
      -- Automatically install LSPs to stdpath for neovim
      "williamboman/mason.nvim",
      "williamboman/mason-lspconfig.nvim",

      -- Useful status updates for LSP
      "j-hui/fidget.nvim",

      -- Additional lua configuration, makes nvim stuff amazing
      "folke/neodev.nvim",
    },
  })

  use({ -- Autocompletion
    "hrsh7th/nvim-cmp",
    requires = {
      "hrsh7th/cmp-nvim-lsp",
      "L3MON4D3/LuaSnip",
      "saadparwaiz1/cmp_luasnip",
      "hrsh7th/cmp-buffer",
      "hrsh7th/cmp-path",
      "hrsh7th/cmp-cmdline",
      "hrsh7th/cmp-nvim-lua",
      "hrsh7th/cmp-nvim-lsp-signature-help",
    },
  })

  use({ -- Highlight, edit, and navigate code
    "nvim-treesitter/nvim-treesitter",
    run = function()
      pcall(require("nvim-treesitter.install").update({ with_sync = true }))
    end,
  })

  use({ -- Additional text objects via treesitter
    "nvim-treesitter/nvim-treesitter-textobjects",
    after = "nvim-treesitter",
  })

  -- Git related plugins
  use("tpope/vim-fugitive")
  use("tpope/vim-rhubarb")
  use("lewis6991/gitsigns.nvim")

  use("folke/tokyonight.nvim") -- Theme
  use("nvim-lualine/lualine.nvim") -- Fancier statusline
  use("lukas-reineke/indent-blankline.nvim") -- Add indentation guides even on blank lines
  use("numToStr/Comment.nvim") -- "gc" to comment visual regions/lines
  use("tpope/vim-sleuth") -- Detect tabstop and shiftwidth automatically

  -- Fuzzy Finder (files, lsp, etc)
  use({ "nvim-telescope/telescope.nvim", branch = "0.1.x", requires = { "nvim-lua/plenary.nvim" } })

  -- Fuzzy Finder Algorithm which requires local dependencies to be built. Only load if `make` is available
  use({ "nvim-telescope/telescope-fzf-native.nvim", run = "make", cond = vim.fn.executable("make") == 1 })

  -- Add custom plugins to packer from ~/.config/nvim/lua/plugins.lua
  local has_plugins, plugins = pcall(require, "plugins")
  if has_plugins then
    plugins(use)
  end

  if is_bootstrap then
    require("packer").sync()
  end
end)

-- When we are bootstrapping a configuration, it doesn't
-- make sense to execute the rest of the init.lua.
--
-- You'll need to restart nvim, and then it will work.
if is_bootstrap then
  print("==================================")
  print("    Plugins are being installed")
  print("    Wait until Packer completes,")
  print("       then restart nvim")
  print("==================================")
  return
end

-- Automatically source and re-compile packer whenever you save this init.lua
local packer_group = vim.api.nvim_create_augroup("Packer", { clear = true })
vim.api.nvim_create_autocmd("BufWritePost", {
  command = "source <afile> | silent! LspStop | silent! LspStart | PackerCompile",
  group = packer_group,
  pattern = vim.fn.expand("$MYVIMRC"),
})

-- [[ Setting options ]]
-- See `:help vim.o`

-- Set highlight on search
vim.o.hlsearch = false
vim.o.incsearch = true

-- clipboard
vim.o.clipboard = "unnamedplus"

-- Make line numbers default
vim.wo.number = true

-- Enable mouse mode
vim.o.mouse = "a"

-- Enable break indent
vim.o.breakindent = true

-- Save undo history
vim.o.undofile = true

-- Case insensitive searching UNLESS /C or capital in search
vim.o.ignorecase = true
vim.o.smartcase = true

-- Decrease update time
vim.o.updatetime = 250
vim.wo.signcolumn = "yes"

-- Set colorscheme
vim.g.tokyonight_style = "night"
vim.g.tokyonight_italic_functions = true
vim.o.termguicolors = true
vim.cmd([[colorscheme tokyonight]])

-- Set completeopt to have a better completion experience
vim.o.completeopt = "menuone,noselect"

-- [[ Basic Keymaps ]]
-- Set <space> as the leader key
-- See `:help mapleader`
--  NOTE: Must happen before plugins are required (otherwise wrong leader will be used)
vim.g.mapleader = " "
vim.g.maplocalleader = " "

-- Keymaps for better default experience
-- See `:help vim.keymap.set()`
vim.keymap.set({ "n", "v" }, "<Space>", "<Nop>", { silent = true })

-- Remap for dealing with word wrap
vim.keymap.set("n", "k", "v:count == 0 ? 'gk' : 'k'", { expr = true, silent = true })
vim.keymap.set("n", "j", "v:count == 0 ? 'gj' : 'j'", { expr = true, silent = true })

-- [[ Highlight on yank ]]
-- See `:help vim.highlight.on_yank()`
local highlight_group = vim.api.nvim_create_augroup("YankHighlight", { clear = true })
vim.api.nvim_create_autocmd("TextYankPost", {
  callback = function()
    vim.highlight.on_yank()
  end,
  group = highlight_group,
  pattern = "*",
})

-- Enable Comment.nvim
require("Comment").setup()

-- Enable `lukas-reineke/indent-blankline.nvim`
-- See `:help indent_blankline.txt`
require("indent_blankline").setup({
  char = "┊",
  show_trailing_blankline_indent = false,
})

require("trouble").setup()

-- nvim-autopairs
require("nvim-autopairs").setup()

-- Diagnostic keymaps
vim.keymap.set("n", "[d", vim.diagnostic.goto_prev)
vim.keymap.set("n", "]d", vim.diagnostic.goto_next)
vim.keymap.set("n", "<leader>e", vim.diagnostic.open_float)
vim.keymap.set("n", "<leader>q", vim.diagnostic.setloclist)

-- LSP settings.
--  This function gets run when an LSP connects to a particular buffer.
local on_attach = function(_, bufnr)
  -- NOTE: Remember that lua is a real programming language, and as such it is possible
  -- to define small helper and utility functions so you don't have to repeat yourself
  -- many times.
  --
  -- In this case, we create a function that lets us more easily define mappings specific
  -- for LSP related items. It sets the mode, buffer and description for us each time.
  local nmap = function(keys, func, desc)
    if desc then
      desc = "LSP: " .. desc
    end

    vim.keymap.set("n", keys, func, { buffer = bufnr, desc = desc })
  end

  nmap("<leader>rn", vim.lsp.buf.rename, "[R]e[n]ame")
  nmap("<leader>ca", vim.lsp.buf.code_action, "[C]ode [A]ction")

  nmap("gd", vim.lsp.buf.definition, "[G]oto [D]efinition")
  nmap("gr", require("telescope.builtin").lsp_references, "[G]oto [R]eferences")
  nmap("gI", vim.lsp.buf.implementation, "[G]oto [I]mplementation")
  nmap("<leader>D", vim.lsp.buf.type_definition, "Type [D]efinition")
  nmap("<leader>ds", require("telescope.builtin").lsp_document_symbols, "[D]ocument [S]ymbols")
  nmap("<leader>ws", require("telescope.builtin").lsp_dynamic_workspace_symbols, "[W]orkspace [S]ymbols")

  -- See `:help K` for why this keymap
  nmap("K", vim.lsp.buf.hover, "Hover Documentation")
  nmap("<C-k>", vim.lsp.buf.signature_help, "Signature Documentation")

  -- Lesser used LSP functionality
  nmap("gD", vim.lsp.buf.declaration, "[G]oto [D]eclaration")
  nmap("<leader>wa", vim.lsp.buf.add_workspace_folder, "[W]orkspace [A]dd Folder")
  nmap("<leader>wr", vim.lsp.buf.remove_workspace_folder, "[W]orkspace [R]emove Folder")
  nmap("<leader>wl", function()
    print(vim.inspect(vim.lsp.buf.list_workspace_folders()))
  end, "[W]orkspace [L]ist Folders")

  -- Create a command `:Format` local to the LSP buffer
  vim.api.nvim_buf_create_user_command(bufnr, "Format", function(_)
    vim.lsp.buf.format()
  end, { desc = "Format current buffer with LSP" })
end

-- Enable the following language servers
--  Feel free to add/remove any LSPs that you want here. They will automatically be installed.
--
--  Add any additional override configuration in the following tables. They will be passed to
--  the `settings` field of the server config. You must look up that documentation yourself.
local servers = {
  -- clangd = {},
  -- gopls = {},
  -- pyright = {},
  -- rust_analyzer = {},
  -- tsserver = {},

  sumneko_lua = {
    Lua = {
      workspace = { checkThirdParty = false },
      telemetry = { enable = false },
    },
  },
}

-- Setup neovim lua configuration
require("neodev").setup()
--
-- nvim-cmp supports additional completion capabilities, so broadcast that to servers
local capabilities = vim.lsp.protocol.make_client_capabilities()
capabilities = require("cmp_nvim_lsp").default_capabilities(capabilities)

-- Setup mason so it can manage external tooling
require("mason").setup()

-- Ensure the servers above are installed
local mason_lspconfig = require("mason-lspconfig")

mason_lspconfig.setup({
  ensure_installed = vim.tbl_keys(servers),
})

mason_lspconfig.setup_handlers({
  function(server_name)
    require("lspconfig")[server_name].setup({
      capabilities = capabilities,
      on_attach = on_attach,
      settings = servers[server_name],
    })
  end,
})

-- Turn on lsp status information
require("fidget").setup()

-- nvim-cmp setup
local cmp = require("cmp")
local luasnip = require("luasnip")

cmp.setup({
  snippet = {
    expand = function(args)
      luasnip.lsp_expand(args.body)
    end,
  },
  mapping = cmp.mapping.preset.insert({
    ["<C-d>"] = cmp.mapping.scroll_docs(-4),
    ["<C-f>"] = cmp.mapping.scroll_docs(4),
    ["<C-Space>"] = cmp.mapping.complete(),
    ["<CR>"] = cmp.mapping.confirm({
      behavior = cmp.ConfirmBehavior.Replace,
      select = true,
    }),
    ["<Tab>"] = cmp.mapping(function(fallback)
      if cmp.visible() then
        cmp.select_next_item()
      elseif luasnip.expand_or_jumpable() then
        luasnip.expand_or_jump()
      else
        fallback()
      end
    end, { "i", "s" }),
    ["<S-Tab>"] = cmp.mapping(function(fallback)
      if cmp.visible() then
        cmp.select_prev_item()
      elseif luasnip.jumpable(-1) then
        luasnip.jump(-1)
      else
        fallback()
      end
    end, { "i", "s" }),
  }),
  sources = {
    { name = "nvim_lsp" },
    { name = "luasnip" },
    { name = "buffer" },
    { name = "path" },
    { name = "nvim_lua" },
    { name = "nvim_lsp_signature_help" },
  },
})

local cmp_autopairs = require("nvim-autopairs.completion.cmp")
cmp.event:on("confirm_done", cmp_autopairs.on_confirm_done())

-- The line beneath this is called `modeline`. See `:help modeline`
-- vim: ts=2 sts=2 sw=2 et