-- Author        : swytch
-- Created       : Sunday Jan. 29, 00:03:53 CET
-- License       : GPLv3
-- Description   : completion plugin config file

return {
    {
        "L3MON4D3/LuaSnip",
        opts = function()
            local types = require("luasnip.util.types")
            return {
                history = true,
                -- Update more often, :h events for more info.
                updateevents = "TextChanged,TextChangedI",
                ext_opts = {
                    [types.choiceNode] = {
                        active = {
                            virt_text = { { "●", "LuaSnipChoice" } },
                        },
                        inactive = {
                            virt_text = { { "●", "LuaSnipInactive" } },
                        },
                    },
                    [types.functionNode] = {
                        active = {
                            virt_text = { { "●", "LuaSnipFunction" } },
                        },
                        inactive = {
                            virt_text = { { "●", "LuaSnipInactive" } },
                        },
                    },
                    [types.insertNode] = {
                        active = {
                            virt_text = { { "●", "LuaSnipInsert" } },
                        },
                        inactive = {
                            virt_text = { { "●", "LuaSnipInactive" } },
                        },
                    },
                },
                -- treesitter-hl has 100, use something higher (default is 200).
                ext_base_prio = 200,
                -- minimal increase in priority.
                ext_prio_increase = 1,
                enable_autosnippets = true,
            }
        end,
    },
    {
        "hrsh7th/nvim-cmp",
        dependencies = {
            "saadparwaiz1/cmp_luasnip",
            "hrsh7th/cmp-nvim-lsp",
            "hrsh7th/cmp-nvim-lua",
            "hrsh7th/cmp-buffer",
            "hrsh7th/cmp-path",
            "hrsh7th/cmp-calc",
            "ray-x/cmp-treesitter",
            "f3fora/cmp-spell",
        },
        opts = function()
            local cmp = require("cmp")
            local luasnip = require("luasnip")

            local has_words_before = function()
                local line, col = unpack(vim.api.nvim_win_get_cursor(0))
                return col ~= 0 and
                    vim.api.nvim_buf_get_lines(0, line - 1, line, true)[1]:
                    sub(col, col):match('%s') == nil
            end

            return {
                completion = {
                    autocomplete = true
                },
                sources = {
                    { name = "path" },
                    { name = "luasnip" },
                    { name = "nvim_lsp" },
                    { name = "buffer" },
                    { name = "nvim_lua" },
                    { name = "calc" },
                    { name = "spell" },
                    { name = "treesitter" },
                },
                formatting = {
                    format = function(entry, vim_item)
                        vim_item.menu = ({
                            nvim_lsp   = "[lsp]",
                            nvim_lua   = "[nvim]",
                            luasnip    = "[snip]",
                            path       = "[path]",
                            buffer     = "[buff]",
                            calc       = "[calc]",
                            spell      = "[spel]",
                            treesitter = "[tree]",
                        })[entry.source.name]
                        return vim_item
                    end,
                },
                snippet = {
                    expand = function(args)
                        luasnip.lsp_expand(args.body)
                    end,
                },
                mapping = {
                    ["<C-d>"] = cmp.mapping.scroll_docs(-4),
                    ["<C-f>"] = cmp.mapping.scroll_docs(4),
                    ["<C-e>"] = cmp.mapping.close(),
                    ["<CR>"] = cmp.mapping.confirm({
                        behavior = cmp.ConfirmBehavior.Replace,
                        select = true,
                    }),
                    ["<Tab>"] = cmp.mapping(function(fallback)
                        if luasnip.expand_or_locally_jumpable() then
                            luasnip.expand_or_jump()
                        else
                            fallback()
                        end
                    end, { "i", "s" }),
                    ["<S-Tab>"] = cmp.mapping(function(fallback)
                        if luasnip.jumpable(-1) then
                            luasnip.jump(-1)
                        else
                            fallback()
                        end
                    end, { "i", "s" }),
                    ["<C-n>"] = cmp.mapping(function(fallback)
                        if cmp.visible() then
                            cmp.select_next_item()
                        elseif has_words_before() then
                            cmp.complete()
                        else
                            fallback()
                        end
                    end, { "i", "s" }),
                    ["<C-p>"] = cmp.mapping(function(fallback)
                        if cmp.visible() then
                            cmp.select_prev_item()
                        else
                            fallback()
                        end
                    end, { "i", "s" }),
                },
                view = {
                    entries = { name = 'custom', selection_order = 'near_cursor' }
                },
            }
        end,
    }
}