-- Completion menu.

-- Icons to display.
local icons = {
  Text = "  ",
  Method = "  ",
  Function = "  ",
  Constructor = "  ",
  Field = " ﰠ ",
  Variable = "  ",
  Class = " ﴯ ",
  Interface = "  ",
  Module = "  ",
  Property = " ﰠ ",
  Unit = " 塞 ",
  Value = "  ",
  Enum = "  ",
  Keyword = "  ",
  Snippet = "  ",
  Color = "  ",
  File = "  ",
  Reference = "  ",
  Folder = "  ",
  EnumMember = "  ",
  Constant = "  ",
  Struct = " פּ ",
  Event = "  ",
  Operator = "  ",
  TypeParameter = " T ",
  Book = "  ",
}

-- Load loaders from VSCode.
--require("luasnip.loaders.from_vscode").lazy_load({
--  paths = { "~/.local/share/lazy/friendly-snippets" }
--})

return {
  "hrsh7th/nvim-cmp",
  dependencies = {
    { "octaltree/cmp-look" },
    --
    { "hrsh7th/cmp-nvim-lsp" },
    --
    { "hrsh7th/cmp-nvim-lua" },
    -- Buffer words.
    { "hrsh7th/cmp-buffer" },
    -- Path autocompletion.
    { "hrsh7th/cmp-path" },
    --
    { "hrsh7th/cmp-cmdline" },
    --
    { "saadparwaiz1/cmp_luasnip" },
    --
    { "hrsh7th/vim-vsnip" },
    --
    { "rafamadriz/friendly-snippets" },
    -- Snippets for lua.
    { "L3MON4D3/LuaSnip" }, --config = "luasnip" },
    --
    { "hrsh7th/cmp-vsnip" },
    --
    -- Signature for functions.
    --{ 'hrsh7th/cmp-nvim-lsp-signature-help' },
    --
    { "hrsh7th/vim-vsnip-integ" },
    -- Make arimathetic operations.
    { "hrsh7th/cmp-calc" },
    -- Emoji.
    { "hrsh7th/cmp-emoji" },
  },
  config = function()
    local cmp = require("cmp")
    local luasnip = require("luasnip")
    require("luasnip.loaders.from_vscode").lazy_load()
    luasnip.config.setup({})

    -- Load specialities from LuaSnip.
    -- Set it with VSCode-like mode.
    luasnip.config.set_config({
      history = true,
      updateevents = "TextChanged,TextChangedI",
    })

    cmp.setup({

      -- Window documentation, for defining its dimensions.
      window = {
        -- Max 10 items on display for documentation.
        max_height = 10,
        completion = {
          side_padding = 0,
          col_offset = 1,
        },
      },

      -- Snippet support.
      snippet = {
        expand = function(args) require("luasnip").lsp_expand(args.body) end,
      },

      -- How the match works based on the input.
      matching = {
        -- Whethever we allow fuzzy matching or not.
        disallow_fuzzy_matching = false,
      },

      -- Mapping each keybind.
      mapping = {
        ["<C-n>"] = cmp.mapping.select_next_item(),
        ["<C-p>"] = cmp.mapping.select_prev_item(),

        ["<C-d>"] = cmp.mapping.scroll_docs(-4),
        ["<C-f>"] = cmp.mapping.scroll_docs(4),
        ["<C-Space>"] = cmp.mapping.complete(),
        ["<C-e>"] = cmp.mapping.close(),
        ["<CR>"] = cmp.mapping.confirm({
          behavior = cmp.ConfirmBehavior.Replace,
          select = true,
        }),
        ["<Tab>"] = function(fallback)
          if cmp.visible() then
            cmp.select_next_item()
          elseif require("luasnip").expand_or_jumpable() then
            vim.fn.feedkeys(vim.api.nvim_replace_termcodes("<Plug>luasnip-expand-or-jump", true, true, true), "")
          else
            fallback()
          end
        end,
        ["<S-Tab>"] = function(fallback)
          if cmp.visible() then
            cmp.select_prev_item()
          elseif require("luasnip").jumpable(-1) then
            vim.fn.feedkeys(vim.api.nvim_replace_termcodes("<Plug>luasnip-jump-prev", true, true, true), "")
          else
            fallback()
          end
        end,
      },

      -- Formatting the menu display.
      formatting = {
        fields = { "kind", "abbr", "menu" },
        format = function(_, vim_item)
          vim_item.menu = vim_item.kind

          -- load lspkind icons
          --vim_item.kind = string.format(
          --  "%s %s",
          --  icons[vim_item.kind],
          --  vim_item.kind
          --)
          vim_item.kind = icons[vim_item.kind]

          --vim_item.menu = string.format(
          --  "%s %s",
          --  ({
          --      nvim_lsp = "力",
          --      nvim_lua = "",
          --      luasnip  = icons.Color,
          --      path     = "﫶",
          --      buffer   = "﬘ ",
          --      look     = icons.Book,
          --      emoji    = "😎",
          --  })[entry.source.name],
          --  name
          --)

          return vim_item
        end,
      },

      -- Experimental features.
      experimental = {

        -- It will type a shadow text of the intended completion.
        ghost_text = { hl_group = "Comment" },
      },

      -- Sources for completion, since it is modular; cmp accepts
      -- Multiple modules.
      sources = {

        -- Simple signature, normally outside an object.
        --{ name = 'nvim_lsp_signature_help', priority = 15 },

        -- More snippets.
        -- For all types of languages.
        {
          name = "friendly-snippets",
          priority = 11,
        },

        -- For the Nvim lua specifics commands.
        {
          name = "nvim_lua",
          priority = 8,
        },

        -- Support with the current active LSP.
        -- Anything that LSP supports and can share with CMP.
        {
          name = "nvim_lsp",
          priority = 11,
          --max_item_count = 10,
        },

        -- Snippets in general to facilitate life.
        -- Type a often typed methods, like for in C.
        -- { name = "luasnip",  priority = 6 },

        -- Show path based on the backslashes.
        -- Type any path, relatively or globally.
        {
          name = "path",
          priority = 9,
        },

        -- Words from buffer.
        {
          name = "buffer",
          priority = 4,
        },

        -- Max item count.

        -- Dictionary for words.
        -- Type any word that is on the /usr/share/dict/words
        --{
        --  name           = 'look',
        --  priority       = 1,
        --  keyword_length = 3,
        --  max_item_count = 4,
        --  option = {
        --    convert_case = true,
        --    loud = true,
        --    dict = '/usr/share/dict/words'
        --  },
        --},

        -- Emoji.
        -- Activate with ":".
        { name = "emoji", priority = 2, option = { insert = true } },

        -- Calculate expressions based on the current line.
        -- Activate with something like "4 + 5".
        {
          name = "calc",
          priority = 10,
        },
      },
    })
  end,
}

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