-- install packer if not already there
local is_bootstrap = false
local install_path = vim.fn.stdpath 'data' .. '/site/pack/packer/start/packer.nvim'
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

-- Install Plugins
require('packer').startup(function(use)
  use 'wbthomason/packer.nvim'
  use 'neovim/nvim-lspconfig'
  use 'nvim-treesitter/nvim-treesitter'
  use 'folke/neodev.nvim'
  use { "catppuccin/nvim", as = "catppuccin" }
  use {
    'hrsh7th/nvim-cmp',
    requires = { 'hrsh7th/cmp-nvim-lsp', 'hrsh7th/cmp-buffer', 'hrsh7th/cmp-cmdline', 'hrsh7th/cmp-path', 'hrsh7th/cmp-nvim-lua', 'onsails/lspkind.nvim', 'L3MON4D3/LuaSnip', 'saadparwaiz1/cmp_luasnip' }
  }
  use {
    'j-morano/buffer_manager.nvim',
    requires = { 'nvim-lua/plenary.nvim'}
  }
  if is_bootstrap then
    require('packer').sync()
  end
end)

-- Don't run additional config if installing packer
if is_bootstrap then
  print '=================================='
  print '    Plugins are being installed'
  print '    Wait until Packer completes,'
  print '       then restart nvim'
  print '=================================='
  return
end

-- load plugins
local bufferManager = require('buffer_manager.ui')

-- colorscheme
require("catppuccin").setup({
  flavour = "frappe",
  transparent_background = true,
})

vim.cmd.colorscheme 'catppuccin'

-- Some basic settings
vim.wo.number = true
vim.wo.relativenumber = true
vim.o.pumheight = 20

-- Netrw
vim.g.netrw_banner = 0
vim.g.netrw_liststyle = 3

-- leader
vim.g.mapleader = ' '

-- keybinds
vim.keymap.set('n', '<leader>bs', bufferManager.toggle_quick_menu, {})
vim.keymap.set('n', '<leader>ps', require('packer').sync, {})

-- Additional keybinds if lsp running
local on_attach = function(client, bufnr)
  local bufopts = { noremap=true, silent=true, buffer=bufnr }
  vim.keymap.set('n', 'gD', vim.lsp.buf.declaration, bufopts)
  vim.keymap.set('n', 'gd', vim.lsp.buf.definition, bufopts)
end

local lsp_flags = {
  
}

local capabilities = vim.lsp.protocol.make_client_capabilities()
-- capabilities.textDocument.completion.completionItem.snippetSupport = true
capabilities = require('cmp_nvim_lsp').default_capabilities(capabilities)

require("neodev").setup({
  -- add any options here, or leave empty to use the default settings
})

local lspconfig = require('lspconfig')

-- lsp configs
lspconfig.tsserver.setup{
  on_attach = on_attach,
  flags = lsp_flags
}

lspconfig.lua_ls.setup{
  on_attach = on_attach,
  flags = lsp_flags,
  capabilities = capabilities,
  settings = {
    Lua = {
      completion = {
        callSnippet = "Replace"
      },
      workspace = { checkThirdParty = false },
      diagnostics = {
        globals = {'vim'},
      }
    }
  }
}

lspconfig.gopls.setup{
  on_attach = on_attach,
  flags = lsp_flags
}

lspconfig.emmet_ls.setup{
  on_attach = on_attach,
  flags = lsp_flags,
  capabilities = capabilities
}

lspconfig.cssls.setup{
  on_attach = on_attach,
  flags = lsp_flags,
  capabilities = capabilities
}

lspconfig.docker_compose_language_service.setup{
  on_attach = on_attach,
  flags = lsp_flags,
  capabilities = capabilities
}

-- TreeSitter Config
require('nvim-treesitter.configs').setup{
  ensure_installed = {'go', 'toml', 'json', 'yaml', 'vim', 'typescript', 'help', 'lua', 'javascript', 'python'},
  highlight = {
    enable = true
  }
}

-- autocompletion
local cmp = require 'cmp'
local lspkind = require 'lspkind'
local luasnip = require 'luasnip'

luasnip.config.setup {}

cmp.setup {
  formatting = {
    format = lspkind.cmp_format()
  },
  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' },
  },
}