-- lua/plugins/cmp.lua

local cmp = require("cmp")
local luasnip = require("luasnip")

-- Setup nvim-cmp.
cmp.setup({
    snippet = {
        -- REQUIRED - you must specify a snippet engine
        expand = function(args)
            luasnip.lsp_expand(args.body) -- Use LuaSnip to expand snippets
        end,
    },

    mapping = cmp.mapping.preset.insert({
        ['<C-k>'] = cmp.mapping.select_prev_item(),    -- Move up on suggestion list
        ['<C-j>'] = cmp.mapping.select_next_item(),    -- Move down on suggestion list
        ['<C-b>'] = cmp.mapping.scroll_docs(-4),       -- Scroll docs up
        ['<C-f>'] = cmp.mapping.scroll_docs(4),        -- Scroll docs down
        ['<C-Space>'] = cmp.mapping.complete(),        -- Trigger completion menu
        ['<C-e>'] = cmp.mapping.abort(),               -- Close completion window
        ['<CR>'] = cmp.mapping.confirm({ select = true }), -- Enter to confirm selection
        ['<Tab>'] = cmp.mapping(function(fallback)
            if cmp.visible() then
                cmp.select_next_item()
            elseif luasnip.expand_or_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.jumpable(-1) then
                luasnip.jump(-1)
            else
                fallback()
            end
        end, { "i", "s" }),
    }),

    sources = cmp.config.sources({
        { name = 'nvim_lsp' }, -- LSP suggestions (your language servers)
        { name = 'luasnip' }, -- Snippets suggestions
        { name = 'buffer' }, -- Words from open buffers
        { name = 'path' }, -- File paths
    }),
})