local cmp_status_ok, cmp = pcall(require, "cmp")
if not cmp_status_ok then
    return
end

local snip_status_ok, luasnip = pcall(require, "luasnip")
if not snip_status_ok then
    return
end

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

local check_backspace = function()
    local col = vim.fn.col "." - 1
    return col == 0 or vim.fn.getline("."):sub(col, col):match "%s"
end

--   פּ ﯟ   some other good icons
local kind_icons = {
    Text = "",
    Method = "m",
    Function = "",
    Constructor = "",
    Field = "",
    Variable = "",
    Class = "",
    Interface = "",
    Module = "",
    Property = "",
    Unit = "",
    Value = "",
    Enum = "",
    Keyword = "",
    Snippet = "",
    Color = "",
    File = "",
    Reference = "",
    Folder = "",
    EnumMember = "",
    Constant = "",
    Struct = "",
    Event = "",
    Operator = "",
    TypeParameter = "",
}
-- find more here: https://www.nerdfonts.com/cheat-sheet

cmp.setup {
    --snippet = {
    --    expand = function(args)
    --        luasnip.lsp_expand(args.body) -- For `luasnip` users.
    --    end,
    --},

    snippet = {
        expand = function(args)
            vim.fn["vsnip#anonymous"](args.body)
        end,
    },
    mapping = {
        ["<C-p>"] = cmp.mapping.select_prev_item(),
        ["<C-n>"] = cmp.mapping.select_next_item(),
        ['<C-S-f>'] = cmp.mapping.scroll_docs(-4),
        ['<C-f>'] = cmp.mapping.scroll_docs(4),
        ["<C-Space>"] = cmp.mapping(cmp.mapping.complete(), { "i", "c" }),
        ["<C-y>"] = cmp.config.disable, -- Specify `cmp.config.disable` if you want to remove the default `<C-y>` mapping.
        ["<C-e>"] = cmp.mapping {
            i = cmp.mapping.abort(),
            c = cmp.mapping.close(),
        },
        -- Accept currently selected item. If none selected, `select` first item.
        -- Set `select` to `false` to only confirm explicitly selected items.
        ["<CR>"] = cmp.mapping.confirm { select = true },
        ["<Tab>"] = cmp.mapping(function(fallback)
            if cmp.visible() then
                cmp.select_next_item()
            elseif luasnip.expandable() then
                luasnip.expand()
            elseif luasnip.expand_or_jumpable() then
                luasnip.expand_or_jump()
            elseif check_backspace() then
                fallback()
            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",
        }),
    },
    formatting = {
        fields = { "kind", "abbr", "menu" },
        format = function(entry, vim_item)
            -- Kind icons
            vim_item.kind = string.format("%s", kind_icons[vim_item.kind])
            -- vim_item.kind = string.format('%s %s', kind_icons[vim_item.kind], vim_item.kind) -- This concatonates the icons with the name of the item kind
            vim_item.menu = ({
                nvim_lsp = "[LSP]",
                luasnip = "[Snip]",
                buffer = "[Buff]",
                path = "[Path]",
                vsnip = "[VSnip]",
            })[entry.source.name]
            return vim_item
        end,
    },
    sources = {
            { name = 'path' },                              -- file paths
            { name = 'nvim_lsp', keyword_length = 3 },      -- from language server
            { name = 'nvim_lsp_signature_help'},            -- display function signatures with current parameter emphasized
            { name = 'nvim_lua', keyword_length = 2},       -- complete neovim's Lua runtime API such vim.lsp.*
    { name = 'buffer', keyword_length = 2 },        -- source current buffer
    { name = 'vsnip', keyword_length = 2 },         -- nvim-cmp source for vim-vsnip 
    { name = 'calc'},                               -- source for math calculation
  },
    confirm_opts = {
        behavior = cmp.ConfirmBehavior.Replace,
        select = false,
    },
    experimental = {
        ghost_text = false,
        native_menu = false,
    },
}