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 = "󰉺",
}

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

return {
    { "hrsh7th/cmp-nvim-lsp" },
    {
        "L3MON4D3/LuaSnip",
        dependencies = {
            "saadparwaiz1/cmp_luasnip",
            "rafamadriz/friendly-snippets",
        },
    },
    {
        "hrsh7th/nvim-cmp",
        config = function()
            local cmp = require("cmp")
            local luasnip = require("luasnip")
            require("luasnip.loaders.from_vscode").lazy_load()

            vim.opt.completeopt = { "menu", "menuone", "noselect" }
            cmp.setup({
                snippet = {
                    expand = function(args)
                        luasnip.lsp_expand(args.body)
                    end,
                },
                formatting = {
                    fields = { "kind", "abbr", "menu" },
                    format = function(entry, vim_item)
                        vim_item.kind = string.format("%s", kind_icons[vim_item.kind])
                        vim_item.menu = ({
                            nvim_lsp = "[LSP]",
                            nvim_lua = "[LUA]",
                            luasnip = "[Snippet]",
                            buffer = "[Buffer]",
                            path = "[Path]",
                        })[entry.source.name]
                        return vim_item
                    end,
                },
                preselect = "item",
                completion = {
                    completeopt = "menu,menuone,noinsert",
                },
                window = {
                    documentation = cmp.config.window.bordered(),
                },
                sources = {
                    { name = "path" },
                    { name = "nvim_lsp" },
                    { name = "nvim_lua" },
                    { name = "buffer",  keyword_length = 3 },
                    { name = "luasnip", keyword_length = 2 },
                },
                mapping = {
                    ["<C-k>"] = cmp.mapping.select_prev_item(),
                    ["<C-j>"] = cmp.mapping.select_next_item(),
                    ["<C-b>"] = cmp.mapping(cmp.mapping.scroll_docs(-1), { "i", "c" }),
                    ["<C-f>"] = cmp.mapping(cmp.mapping.scroll_docs(1), { "i", "c" }),
                    ["<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",
                    }),
                },
            })
        end,
    },
}
