-- plugins
require('packer').startup(function(use)
  use 'wbthomason/packer.nvim'
  use 'ii14/onedark.nvim'
  use {
    'mengelbrecht/lightline-bufferline',
    requires = {
      'itchyny/lightline.vim'
    }
  }
  use 'kyazdani42/nvim-web-devicons'
  use 'sheerun/vim-polyglot'
  use 'editorconfig/editorconfig-vim'
  use {
    'williamboman/mason-lspconfig.nvim',
    requires = {
      'williamboman/mason.nvim',
      'neovim/nvim-lspconfig'
    }
  }
  use {
    'hrsh7th/nvim-cmp',
    requires = {
      'hrsh7th/cmp-nvim-lsp',
      'saadparwaiz1/cmp_luasnip',
      'L3MON4D3/LuaSnip'
    }
  }
end)

-- basics
vim.opt.number = true
vim.opt.showmode = true
vim.opt.showtabline = 2
vim.opt.tabstop = 4
vim.opt.shiftwidth = 4
vim.opt.softtabstop = 0
vim.opt.expandtab = true
vim.opt.termguicolors = true
vim.opt.completeopt = { 'menu', 'menuone', 'noselect', 'noinsert' }
vim.cmd.syntax('on')
vim.cmd.colorscheme('onedark')

-- settings for specific filetypes
vim.api.nvim_create_autocmd('FileType', {
  pattern = { 'html', 'css', 'scss', 'lua', 'json', 'yaml', 'yaml.*' },
  callback = function()
    vim.opt_local.tabstop = 2
    vim.opt_local.shiftwidth = 2
  end
})
vim.api.nvim_create_autocmd({ 'BufNewFile', 'BufRead' }, {
  pattern = { 'zsh*', '.zsh*', '*.zsh' },
  callback = function()
    vim.opt.filetype = 'sh'
  end
})

-- appearance
vim.cmd.highlight { 'Normal', 'guibg=NONE', 'ctermbg=NONE' }
vim.g.background = 'dark'

-- lightline config
vim.g.lightline = {
  colorscheme = 'one',
  tabline = {
    left = { { 'buffers' } },
    right = { { 'close' } }
  },
  component_expand = {
    buffers = 'lightline#bufferline#buffers'
  },
  component_type = {
    buffers = 'tabsel'
  }
}

-- lightline-bufferline config
vim.g['lightline#bufferline#show_number'] = 2
vim.g['lightline#bufferline#shorten_path'] = 0
vim.g['lightline#bufferline#smart_path'] = 1
vim.g['lightline#bufferline#enable_devicons'] = 1
vim.g['lightline#bufferline#unnamed'] = '[No Name]'
vim.g['lightline#bufferline#icon_position'] = 'right'

-- autocompletion config
local cmp = require('cmp')
local luasnip = require('luasnip')

luasnip.config.setup {}

cmp.setup {
  snippet = {
    expand = function(args)
      luasnip.lsp_expand(args.body)
    end
  },
  mapping = {
    ['<C-d>'] = cmp.mapping.scroll_docs(-4),
    ['<C-f>'] = cmp.mapping.scroll_docs(4),
    ['<C-Space>'] = cmp.mapping.complete(),
    ['<C-e>'] = cmp.mapping.abort(),
    ['<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' }
  }
}

cmp.setup.cmdline('/', {
  sources = {
    { name = 'buffer' }
  }
})

cmp.setup.cmdline(':', {
  sources = cmp.config.sources({
    { name = 'path' }
  },
  {
    { name = 'cmdline' }
  })
})

-- lsp config
require('mason').setup {}
require("mason-registry").refresh()
require('mason-lspconfig').setup {
  automatic_installation = true
}

local lsp = require('lspconfig')
local capabilities = require('cmp_nvim_lsp').default_capabilities()

lsp.ansiblels.setup {
  capabilities = capabilities
}
lsp.bashls.setup {
  capabilities = capabilities
}
lsp.clangd.setup {
  capabilities = capabilities
}
lsp.dockerls.setup {
  capabilities = capabilities
}
lsp.gopls.setup {
  capabilities = capabilities
}
lsp.lua_ls.setup {
  capabilities = capabilities,
  settings = {
    Lua = {
      runtime = {
        version = 'LuaJIT'
      },
      diagnostics = {
        globals = { 'vim' }
      },
      telemetry = {
        enable = false
      }
    }
  }
}
lsp.pylsp.setup {
  capabilities = capabilities
}
lsp.vimls.setup {
  capabilities = capabilities,
  init_options = {
    diagnostic = {
      enable = false
    },
    isNeovim = true
  }
}
lsp.yamlls.setup {
  capabilities = capabilities,
  settings = {
    redhat = {
      telemetry = {
        enabled = false
      }
    },
    yaml = {
      keyOrdering = false
    }
  }
}

-- keyboard mappings
vim.g.mapleader = ';'

-- buffer navigation
vim.keymap.set('n', '<Leader>1', '<Plug>lightline#bufferline#go(1)')
vim.keymap.set('n', '<Leader>2', '<Plug>lightline#bufferline#go(2)')
vim.keymap.set('n', '<Leader>3', '<Plug>lightline#bufferline#go(3)')
vim.keymap.set('n', '<Leader>4', '<Plug>lightline#bufferline#go(4)')
vim.keymap.set('n', '<Leader>5', '<Plug>lightline#bufferline#go(5)')
vim.keymap.set('n', '<Leader>6', '<Plug>lightline#bufferline#go(6)')
vim.keymap.set('n', '<Leader>7', '<Plug>lightline#bufferline#go(7)')
vim.keymap.set('n', '<Leader>8', '<Plug>lightline#bufferline#go(8)')
vim.keymap.set('n', '<Leader>9', '<Plug>lightline#bufferline#go(9)')
vim.keymap.set('n', '<Leader>0', '<Plug>lightline#bufferline#go(10)')

-- buffer deletion
vim.keymap.set('n', '<Leader>d1', '<Plug>lightline#bufferline#delete(1)')
vim.keymap.set('n', '<Leader>d2', '<Plug>lightline#bufferline#delete(2)')
vim.keymap.set('n', '<Leader>d3', '<Plug>lightline#bufferline#delete(3)')
vim.keymap.set('n', '<Leader>d4', '<Plug>lightline#bufferline#delete(4)')
vim.keymap.set('n', '<Leader>d5', '<Plug>lightline#bufferline#delete(5)')
vim.keymap.set('n', '<Leader>d6', '<Plug>lightline#bufferline#delete(6)')
vim.keymap.set('n', '<Leader>d7', '<Plug>lightline#bufferline#delete(7)')
vim.keymap.set('n', '<Leader>d8', '<Plug>lightline#bufferline#delete(8)')
vim.keymap.set('n', '<Leader>d9', '<Plug>lightline#bufferline#delete(9)')
vim.keymap.set('n', '<Leader>d0', '<Plug>lightline#bufferline#delete(10)')

-- Navigating splits
vim.keymap.set('n', '<C-J>', '<C-W><C-J>')
vim.keymap.set('n', '<C-K>', '<C-W><C-K>')
vim.keymap.set('n', '<C-L>', '<C-W><C-L>')
vim.keymap.set('n', '<C-H>', '<C-W><C-H>')