local function map(mode, lhs, rhs, opts)
	local options = {noremap = false}
	if opts then options = vim.tbl_extend('force', options, opts) end
	vim.api.nvim_set_keymap(mode, lhs, rhs, options)
end

local function noremap(mode, lhs, rhs, opts)
	local options = {noremap = true}
	if opts then options = vim.tbl_extend('force', options, opts) end
	vim.api.nvim_set_keymap(mode, lhs, rhs, options)
end

-- leader
vim.g.mapleader = ' '

-- visual block indenting
noremap('v', '<', '<gv')
noremap('v', '>', '>gv')

-- centered cursor
noremap('n', 'n', 'nzz')
noremap('n', 'N', 'Nzz')
noremap('n', 'J', 'mzJ`z')

-- escape terminal mode
noremap('t', '<Esc>', '<C-\\><C-n>')

-- newline without entering insert mode
noremap('n', '<C-J>', 'o<Esc>')
noremap('n', '<C-K>', 'O<Esc>')

-- movement
noremap('n', '<leader>h',	':wincmd h<cr>')
noremap('n', '<leader>j',	':wincmd j<cr>')
noremap('n', '<leader>k',	':wincmd k<cr>')
noremap('n', '<leader>l',	':wincmd l<cr>')

-- splits and buffers
noremap('n', '<leader>sv',	':vsplit<CR>')
noremap('n', '<leader>sz',	':split<CR>')
noremap('n', '<leader>st',	':tabnew<CR>')
noremap('n', '<leader>sb',	':Telescope buffers<CR>')
noremap('n', '<leader>sh',	':tabprevious<cr>')
noremap('n', '<leader>sl',	':tabnext<cr>')

-- basics
noremap('n', '<leader>q',	':q<CR>')
noremap('n', '<leader>Q',	':qa<CR>')
noremap('n', '<leader>x',	':q!<CR>')
noremap('n', '<leader>X',	':qa!<CR>')
noremap('n', '<leader>w',	':w<CR>')
noremap('n', '<leader>W',	':wa<CR>')
noremap('n', '<leader>f',	':NvimTreeToggle<CR>')
noremap('n', '<leader>F',	':Telescope find_files<CR>')

-- toggle term
noremap('n', '<leader>c',	':ToggleTermToggleAll<CR>')
noremap('n', '<leader>C',	':ToggleTerm<CR>')

-- frequent actions
noremap('n', '<leader>ar',	':source ~/.config/nvim/init.lua<CR>')
noremap('n', '<leader>ac',	':cd ~/.config/nvim/<CR>')

-- keymap switches
noremap('n', '<leader>me',	':set keymap=<CR>')
noremap('n', '<leader>mh',	':set keymap=hebrew<CR>')

-- telescope
noremap('n', '<leader>tt',	':Telescope<CR>')
noremap('n', '<leader>tl',  ':Telescope lsp_dynamic_workspace_symbols<CR>')
noremap('n', '<leader>to',	':Telescope oldfiles<CR>')
noremap('n', '<leader>tg',	':Telescope live_grep<CR>')
noremap('n', '<leader>ts',  ':Telescope treesitter<CR>')
noremap('n', '<leader>tm',  ':Telescope git_status<CR>')
noremap('n', '<leader>tb',  ':Telescope git_branches<CR>')
noremap('n', '<leader>tc',  ':Telescope git_commits<CR>')
noremap('n', '<leader>tf',  ':Telescope git_files<CR>')

-- code
noremap('n', '<leader>gf',	':Neoformat<CR>')
noremap('n', '<leader>gd',  ':Telescope lsp_definitions<CR>')
noremap('n', '<leader>gi',  ':Telescope lsp_implementations<CR>')
noremap('n', '<leader>gr',  ':Telescope lsp_references<CR>')
noremap('n', '<leader>ga',  ':Telescope lsp_code_actions<CR>')
noremap('n', '<leader>gq',  ':Telescope lsp_workspace_diagnostics<CR>')
noremap('n', '<leader>gD',  ':lua vim.lsp.buf.declaration()<CR>')
noremap('n', '<leader>gk',  ':lua vim.lsp.buf.hover()<CR>')
noremap('n', '<leader>gt',  ':lua vim.lsp.buf.type_definition()<CR>')
noremap('n', '<leader>gn',  ':lua vim.lsp.buf.rename()<CR>')
noremap('n', '<leader>ge',  ':lua vim.lsp.diagnostic.show_line_diagnostics()<CR>')
noremap('n', '[d',          ':lua vim.lsp.diagnostic.goto_prev()<CR>')
noremap('n', ']d',          ':lua vim.lsp.diagnostic.goto_next()<CR>')

-- debug mappings
noremap('n', '<leader>dc',  ":lua require'dap'.continue()<CR>")
noremap('n', '<leader>dn',  ":lua require'dap'.step_over()<CR>")
noremap('n', '<leader>di',  ":lua require'dap'.step_into()<CR>")
noremap('n', '<leader>do',  ":lua require'dap'.step_out()<CR>")
noremap('n', '<leader>db',  ":lua require'dap'.toggle_breakpoint()<CR>")
noremap('n', '<leader>dl',  ":lua require'dap'.run_last()<CR>")
noremap('n', '<leader>dq',  ":lua require'dap'.close()<CR>")
noremap('n', '<leader>dv',  ':Telescope dap variables<CR>')
noremap('n', '<leader>dh',  ':Telescope dap commands<CR>')
noremap('n', '<leader>dp',  ':Telescope dap list_breakpoints<CR>')
noremap('n', '<leader>du',  ":lua require'dapui'.toggle()<CR>")

-- vsnip jumpable mappings
map('i', '<Tab>',   "vsnip#jumpable(1)  ? '<Plug>(vsnip-jump-next)' : '<Tab>'",   {expr = true})
map('s', '<Tab>',   "vsnip#jumpable(1)  ? '<Plug>(vsnip-jump-next)' : '<Tab>'",   {expr = true})
map('i', '<S-Tab>', "vsnip#jumpable(-1) ? '<Plug>(vsnip-jump-next)' : '<S-Tab>'", {expr = true})
map('s', '<S-Tab>', "vsnip#jumpable(-1) ? '<Plug>(vsnip-jump-next)' : '<S-Tab>'", {expr = true})