-- completion config (nvim-cmp) --
local cmp = require("cmp")
local luasnip = require("luasnip")

cmp.setup({
    snippet = {
        -- REQUIRED - you must specify a snippet engine
        expand = function(args)
            require('luasnip').lsp_expand(args.body) -- For `luasnip` users.
        end,
        },

        window = {
            -- completion = cmp.config.window.bordered(),
            -- documentation = cmp.config.window.bordered(),
        },

        mapping = cmp.mapping.preset.insert({
            ['<C-b>'] = cmp.mapping.scroll_docs(-4),
            ['<C-f>'] = cmp.mapping.scroll_docs(4),
            ['<C-Space>'] = cmp.mapping.complete(),
            ['<C-e>'] = cmp.mapping.abort(),
            -- ['<CR>'] = cmp.mapping.confirm({ select = true }), -- Accept currently selected item. Set `select` to `false` to only confirm explicitly selected items.
            -- https://github.com/hrsh7th/nvim-cmp/wiki/Example-mappings
            ['<CR>'] = cmp.mapping(function(fallback)
                if cmp.visible() then
                    if luasnip.expandable() then
                        luasnip.expand()
                    else
                        cmp.confirm({ select = true })
                    end
                else
                    fallback()
                end
            end),

            ["<Tab>"] = cmp.mapping(function(fallback)
                if cmp.visible() then
                    cmp.select_next_item()
                elseif luasnip.locally_jumpable() then
                    luasnip.jump()
                else
                    fallback()
                end
            end, { "i", "s" }),

            ["<S-Tab>"] = cmp.mapping(function(fallback)
                if cmp.visible() then
                    cmp.select_prev_item()
                elseif luasnip.locally_jumpable(-1) then
                    luasnip.jump(-1)
                else
                    fallback()
                end
            end, { "i", "s" }),
        }),

        sources = cmp.config.sources({
            { name = 'nvim_lsp' },
            -- { name = 'vsnip' }, -- For vsnip users.
            { name = 'luasnip' }, -- For luasnip users.
            -- { name = 'ultisnips' }, -- For ultisnips users.
            -- { name = 'snippy' }, -- For snippy users.
        }, {
            { name = 'buffer' },
        })
    })

-- Set configuration for specific filetype.
cmp.setup.filetype('gitcommit', {
    sources = cmp.config.sources({
    { name = 'git' }, -- You can specify the `git` source if [you were installed it](https://github.com/petertriho/cmp-git).
    }, {
        { name = 'buffer' },
    })
    })

-- Use buffer source for `/` and `?` (if you enabled `native_menu`, this won't work anymore).
cmp.setup.cmdline({ '/', '?' }, {
    mapping = cmp.mapping.preset.cmdline(),
    sources = {
        { name = 'buffer' }
    }
    })

-- Use cmdline & path source for ':' (if you enabled `native_menu`, this won't work anymore).
cmp.setup.cmdline(':', {
    mapping = cmp.mapping.preset.cmdline(),
    sources = cmp.config.sources({
    { name = 'path' }
    }, {
        { name = 'cmdline' }
        }),
        matching = { disallow_symbol_nonprefix_matching = false }
})

-- Set up lspconfig.
local capabilities = require('cmp_nvim_lsp').default_capabilities()

-- Setup language servers.
local lspconfig = require('lspconfig')
lspconfig.clangd.setup {
    capabilities = capabilities
}
lspconfig.pyright.setup {
    capabilities = capabilities
}
-- lspconfig.tsserver.setup {}
lspconfig.rust_analyzer.setup {
    -- Server-specific settings. See `:help lspconfig-setup`
    settings = {
        ['rust-analyzer'] = {},
        },
        capabilities = capabilities
}

-- LSP signature --
local lsp_sig_cfg = {}
require('lsp_signature').setup(lsp_sig_cfg)

-- Lualine --
require("lualine").setup {
    options = {
        icons_enabled = false,
        theme = "base16"
    },
}