local Plugin = { "hrsh7th/nvim-cmp" }

Plugin.dependencies = {
  -- Completion sources
  { "hrsh7th/cmp-buffer" },
  { "hrsh7th/cmp-path" },
  { "saadparwaiz1/cmp_luasnip" },
  { "hrsh7th/cmp-nvim-lsp" },

  -- Snippets
  { "L3MON4D3/LuaSnip" },
  { "rafamadriz/friendly-snippets" },
}

Plugin.event = "InsertEnter"

function Plugin.config()
  local cmp = require("cmp")
  local luasnip = require("luasnip")

  require("luasnip.loaders.from_vscode").lazy_load()

  local select_opts = { behavior = cmp.SelectBehavior.Select }

  -- See :help cmp-config
  cmp.setup({
    snippet = {
      expand = function(args)
        luasnip.lsp_expand(args.body)
      end,
    },
    sources = {
      { name = "path" },
      { name = "nvim_lsp" },
      { name = "buffer", keyword_length = 3 },
      { name = "luasnip", keyword_length = 2 },
    },
    window = {
      completion = cmp.config.window.bordered(),
      documentation = cmp.config.window.bordered(),
    },
    -- See :help cmp-mapping
    mapping = {
      ["<Up>"] = cmp.mapping.select_prev_item(select_opts),
      ["<Down>"] = cmp.mapping.select_next_item(select_opts),

      ["<C-p>"] = cmp.mapping.select_prev_item(select_opts),
      ["<C-n>"] = cmp.mapping.select_next_item(select_opts),

      ["<C-u>"] = cmp.mapping.scroll_docs(-4),
      ["<C-d>"] = cmp.mapping.scroll_docs(4),

      ["<C-e>"] = cmp.mapping.abort(),
      ["<C-y>"] = cmp.mapping.confirm({ select = true }),
      ["<CR>"] = cmp.mapping.confirm({ select = false }),

      ["<C-f>"] = cmp.mapping(function(fallback)
        if luasnip.jumpable(1) then
          luasnip.jump(1)
        else
          fallback()
        end
      end, { "i", "s" }),

      ["<C-b>"] = cmp.mapping(function(fallback)
        if luasnip.jumpable(-1) then
          luasnip.jump(-1)
        else
          fallback()
        end
      end, { "i", "s" }),

      ["<Tab>"] = cmp.mapping(function(fallback)
        local col = vim.fn.col(".") - 1

        if cmp.visible() then
          cmp.select_next_item(select_opts)
        elseif col == 0 or vim.fn.getline("."):sub(col, col):match("%s") then
          fallback()
        else
          cmp.complete()
        end
      end, { "i", "s" }),

      ["<S-Tab>"] = cmp.mapping.select_prev_item(select_opts),
    },
  })
end

return Plugin