-- Set completeopt to have a better completion experience
-- :help completeopt
-- menuone: popup even when there's only one match
-- noinsert: Do not insert text until a selection is made
-- noselect: Do not select, force to select one from the menu
-- shortness: avoid showing extra messages when using completion
-- updatetime: set updatetime for CursorHold
vim.opt.completeopt = {'menuone', 'noselect', 'noinsert'}
vim.opt.shortmess = vim.opt.shortmess + {c = true}
vim.api.nvim_set_option('updatetime', 300)

-- Fixed column for diagnostics to appear
-- Show autodiagnostic popup on cursor hover_range
-- Goto previous / next diagnostic warning / error 
-- Show inlay_hints more frequently 
vim.cmd([[
set signcolumn=yes
autocmd CursorHold * lua vim.diagnostic.open_float(nil, { focusable = false })
]])

vim.opt.spell = true
vim.opt.spelllang = {'en_us'}
vim.lsp.handlers["textDocument/publishDiagnostics"] =
    vim.lsp.with(
    vim.lsp.diagnostic.on_publish_diagnostics,
    {
        virtual_text = true,
    }
)
-- Completion Plugin Setup
local cmp = require 'cmp'
cmp.setup({
    -- Enable LSP snippets
    snippet = {expand = function(args) vim.fn["vsnip#anonymous"](args.body) end},
    -- <C> = CTRL
    -- <S> = SHIFT
    mapping = {
        ['<C-p>'] = cmp.mapping.select_prev_item(),
        ['<C-n>'] = cmp.mapping.select_next_item(),
        -- Add tab support
        ['<S-Tab>'] = cmp.mapping.select_prev_item(),
        ['<Tab>'] = cmp.mapping.select_next_item(),
        ['<C-S-f>'] = cmp.mapping.scroll_docs(-4),
        ['<C-f>'] = cmp.mapping.scroll_docs(4),
        ['<C-Space>'] = cmp.mapping.complete(),
        ['<C-e>'] = cmp.mapping.close(),
        ['<CR>'] = cmp.mapping.confirm({
            behavior = cmp.ConfirmBehavior.Insert,
            select = true
        })
    },
    -- Installed sources:
    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 = 'calc'}, -- source for math calculation
        {
            name = 'spell',
            option = {
                keep_all_entries = false,
                enable_in_context = function() return true end
            }
        }, {name = 'conventionalcommits', keyword_length = 1}, {name = 'crates'}
    },
    window = {
        completion = cmp.config.window.bordered(),
        documentation = cmp.config.window.bordered()
    },
    formatting = {
        fields = {'menu', 'abbr' --[[ 'kind' ]] },
        format = function(entry, item)
            local menu_icon = {
                nvim_lsp = 'λ',
                vsnip = '⋗',
                buffer = '',
                path = '',
                spell = '¶',
                calc = '√',
                crates = ''
            }
            item.menu = menu_icon[entry.source.name]
            if entry.source.name == "calc" then item.kind = "Math" end
            return item
        end
    }
})
cmp.setup.cmdline('/', {sources = {{name = 'buffer'}}})
cmp.setup.cmdline(':', {
    mapping = cmp.mapping.preset.cmdline(),
    sources = cmp.config.sources({{name = 'path'}}, {
        {name = 'cmdline', option = {ignore_cmds = {'Man', '!'}}}
    })
})