-- Install and configure nvim-cmp to provide completion

--  Install nvim-cmp and dependencies
return {
  "hrsh7th/nvim-cmp",
  event = { "InsertEnter", "CmdlineEnter" },
  dependencies = {
    -- Adds completion capabilities for text in buffers
    "hrsh7th/cmp-buffer",
   -- Adds path completion capabilities
    "hrsh7th/cmp-path",
   -- Adds vim cmdline completion capabilities
    "hrsh7th/cmp-cmdline",

    -- Snippet Engine & its associated nvim-cmp source
    {
      "L3MON4D3/LuaSnip",
      -- Follow latest release
      version = "v2.*",
      -- Install jsregexp (optional)
      build = "make install_jsregexp",
    },
    "saadparwaiz1/cmp_luasnip",
    -- Adds a number of user-friendly snippets
    "rafamadriz/friendly-snippets",

    -- Adds emoji completion after ':' (to be evaluated)
    "hrsh7th/cmp-emoji",
    -- vs-code pictrograms
    "onsails/lspkind.nvim",
  },

  -- Configure nvim-cmp
  config = function()
    local cmp = require("cmp")

    local luasnip = require("luasnip")

    local lspkind = require("lspkind")

    luasnip.config.setup {
      -- Extend markdown snippets to pandoc filetype
      --   https://github.com/L3MON4D3/LuaSnip/issues/132#issuecomment-1101710309
      snippets = {
        markdown = {},
      },
      luasnip.filetype_extend("pandoc", {"markdown"}),
    }

    -- Load snippets from ~/.config/nvim/my_snippets/
    require("luasnip.loaders.from_lua").lazy_load(
      {paths = "~/.config/nvim/my_snippets/"}
    )
    require("luasnip.loaders.from_vscode").lazy_load()

    cmp.setup({
      completion = {
        completeopt = "menu,menuone,preview,noselect",
      },
      snippet = { -- on utilise luasnip comme moteur de snippets
        expand = function(args)
          luasnip.lsp_expand(args.body)
        end,
      },
      mapping = {
        ["<C-p>"] = cmp.mapping.select_prev_item(),
        ["<C-n>"] = cmp.mapping.select_next_item(),
        ["<C-d>"] = cmp.mapping.scroll_docs(-1),
        ["<C-f>"] = cmp.mapping.scroll_docs(1),
        ["<C-Space>"] = cmp.mapping.complete(),
        ["<C-e>"] = cmp.mapping.abort(),
        -- Insert current selection.
        -- `false` insert only explicitly selected items
        ["<CR>"] = cmp.mapping.confirm({ select = true }),
        ['<Tab>'] = cmp.mapping(function(fallback)
          if cmp.visible() then
            cmp.select_next_item()
          elseif luasnip.expand_or_locally_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.locally_jumpable(-1) then
            luasnip.jump(-1)
          else
            fallback()
          end
        end, { 'i', 's' }),
      },

      -- Autocompletion sources
      sources = cmp.config.sources({
        { name = "nvim_lsp" },
        { name = "nvim_lua" },
        { name = "lazydev" },
        { name = "luasnip" }, -- snippets
        {
          name = "buffer",
          option = {
            keyword_length = 4,
            keyword_pattern = [[\k\+]],
          },
        },
        { name = "path" },
        { name = "emoji" },
        { name = "cmp_zotcite"}
      }),

      formatting = {
        -- Default behavior 
        expandable_indicator = true,
        -- Default display fields 
        fields = { "abbr", "kind", "menu" },
        format = lspkind.cmp_format({
          mode = "symbol_text",
          -- Each entry is prefixed by it's type 
          menu = {
            nvim_lsp = "[LSP]",
            buffer = "[Buffer]",
            luasnip = "[LuaSnip]",
            nvim_lua = "[Lua]",
            lazydev = "[Lazydev]",
            path = "[Path]",
            emoji = "[Emoji]",
          },
        }),
      },
    })

  end,
}