-----------------------------------------------------------
-- basic configurations
vim.o.number = true
vim.o.relativenumber = true
vim.cmd([[
highlight LineNr cterm=none ctermfg=256 
]])
vim.o.tabstop = 4
vim.o.shiftwidth = 4
vim.o.autoindent = true
vim.o.cursorcolumn = true
vim.o.cursorline = true
vim.cmd([[
highlight cursorline term=reverse cterm=none ctermbg=239
highlight cursorcolumn ctermbg=235
]])
vim.o.mouse = 'a'
vim.o.signcolumn = 'yes'
vim.o.ignorecase = true
vim.o.smartcase = true

-----------------------------------------------------------
-- to use PowerShell on Windows
-- original code from :h powershell
-- vim script func returns 1/0, while lua evals false only if gets false or nil
-- so be sure to compare with 1/0
if vim.fn.has('win32') == 1 then
	if vim.fn.executable('pwsh') == 1 then
		vim.opt.shell = 'pwsh'
	else
		vim.opt.shell = 'powershell'
	end
	vim.opt.shellcmdflag = '-NoLogo -NoProfile -ExecutionPolicy RemoteSigned -Command [Console]::InputEncoding=[Console]::OutputEncoding=[System.Text.Encoding]::UTF8;'
	vim.opt.shellredir = '-RedirectStandardOutput %s -NoNewWindow -Wait'
	vim.opt.shellpipe = '2>&1 | Out-File -Encoding UTF8 %s; exit $LastExitCode'
	vim.opt.shellquote = ''
	vim.opt.shellxquote = ''
end


-----------------------------------------------------------
-- Plugins
require 'plugins'
vim.cmd [[autocmd BufWritePost plugins.lua PackerCompile]]


-- LSP
-- https://zenn.dev/botamotch/articles/21073d78bc68bf
-- 1. LSP Sever management
require('mason').setup()
require('mason-lspconfig').setup_handlers({ function(server)
	local opt = {
		-- -- Function executed when the LSP server startup
		-- on_attach = function(client, bufnr)
		--   local opts = { noremap=true, silent=true }
		--   vim.api.nvim_buf_set_keymap(bufnr, 'n', 'K', '<cmd>lua vim.lsp.buf.hover()<CR>', opts)
		--   vim.cmd 'autocmd BufWritePre * lua vim.lsp.buf.formatting_sync(nil, 1000)'
		-- end,
		capabilities = require('cmp_nvim_lsp').update_capabilities(
			vim.lsp.protocol.make_client_capabilities()
		)
	}
	require('lspconfig')[server].setup(opt)
end })

-- 2. build-in LSP function
-- keyboard shortcut
vim.keymap.set('n', 'K', '<cmd>lua vim.lsp.buf.hover()<CR>')
vim.keymap.set('n', 'gf', '<cmd>lua vim.lsp.buf.formatting()<CR>')
vim.keymap.set('n', 'gr', '<cmd>lua vim.lsp.buf.references()<CR>')
vim.keymap.set('n', 'gd', '<cmd>lua vim.lsp.buf.definition()<CR>')
vim.keymap.set('n', 'gD', '<cmd>lua vim.lsp.buf.declaration()<CR>')
vim.keymap.set('n', 'gi', '<cmd>lua vim.lsp.buf.implementation()<CR>')
vim.keymap.set('n', 'gt', '<cmd>lua vim.lsp.buf.type_definition()<CR>')
vim.keymap.set('n', 'gn', '<cmd>lua vim.lsp.buf.rename()<CR>')
vim.keymap.set('n', 'ga', '<cmd>lua vim.lsp.buf.code_action()<CR>')
vim.keymap.set('n', 'ge', '<cmd>lua vim.diagnostic.open_float()<CR>')
vim.keymap.set('n', 'g]', '<cmd>lua vim.diagnostic.goto_next()<CR>')
vim.keymap.set('n', 'g[', '<cmd>lua vim.diagnostic.goto_prev()<CR>')
-- LSP handlers
vim.lsp.handlers["textDocument/publishDiagnostics"] = vim.lsp.with(
	vim.lsp.diagnostic.on_publish_diagnostics, { virtual_text = false }
)
-- Reference highlight
vim.cmd [[
set updatetime=500
highlight LspReferenceText  cterm=underline ctermfg=1 ctermbg=8 gui=underline guifg=#A00000 guibg=#104040
highlight LspReferenceRead  cterm=underline ctermfg=1 ctermbg=8 gui=underline guifg=#A00000 guibg=#104040
highlight LspReferenceWrite cterm=underline ctermfg=1 ctermbg=8 gui=underline guifg=#A00000 guibg=#104040
augroup lsp_document_highlight
  autocmd!
  autocmd CursorHold,CursorHoldI * lua vim.lsp.buf.document_highlight()
  autocmd CursorMoved,CursorMovedI * lua vim.lsp.buf.clear_references()
augroup END
]]

-- 3. completion (hrsh7th/nvim-cmp)
local cmp = require("cmp")
cmp.setup({
	snippet = {
		expand = function(args)
			vim.fn["vsnip#anonymous"](args.body)
		end,
	},
	sources = {
		{ name = "nvim_lsp" },
		-- { name = "buffer" },
		-- { name = "path" },
	},
	mapping = cmp.mapping.preset.insert({
		["<C-p>"] = cmp.mapping.select_prev_item(),
		["<C-n>"] = cmp.mapping.select_next_item(),
		['<C-l>'] = cmp.mapping.complete(),
		['<C-e>'] = cmp.mapping.abort(),
		["<CR>"] = cmp.mapping.confirm { select = true },
	}),
	experimental = {
		ghost_text = true,
	},
})
-- cmp.setup.cmdline('/', {
--   mapping = cmp.mapping.preset.cmdline(),
--   sources = {
--     { name = 'buffer' }
--   }
-- })
-- cmp.setup.cmdline(":", {
--   mapping = cmp.mapping.preset.cmdline(),
--   sources = {
--     { name = "path" },
--     { name = "cmdline" },
--   },
-- })


-----------------------------------------------------------
-- Ctrl + P to invoke fzf file search
vim.api.nvim_set_keymap('n', '<c-P>',
	"<cmd>lua require('fzf-lua').files()<CR>",
	{ noremap = true, silent = true })