-- Config shortcuts
local o = vim.o
local keymap = vim.keymap

-- Autocommand group for this file to allow config reloading
local augroup = vim.api.nvim_create_augroup('init', { clear = true })


------------------
-- GENERAL OPTIONS
------------------

-- Line numbers
o.number = true
o.relativenumber = true

-- Highlight the cursor line
o.cursorline = true

-- Amount of screen lines that should be visible above/below the cursor
o.scrolloff = 8

-- Show tabs and trailing spaces
o.list = true

-- Wrap lines at word boundaries
o.linebreak = true

-- Case insensitive search (except when explicitly using uppercase letters)
o.ignorecase = true
o.smartcase = true

-- Indentation settings
o.smartindent = true
o.expandtab = true
o.shiftwidth = 4
o.softtabstop = -1

-- Don't auto-insert comment leader when entering insert mode with o/O
vim.api.nvim_create_autocmd('FileType', {
    group = augroup,
    command = 'set formatoptions-=o',
})

-- Open new split windows at the bottom / right side
o.splitbelow = true
o.splitright = true

-- Pseudo-transparency for floating windows
o.winblend = 10

-- Show inline diagnostics (LSP)
vim.diagnostic.config { virtual_text = true }


-------------
-- FILE TYPES
-------------

vim.filetype.add {
    extension = {
        gitconfig = 'gitconfig',
    },
}

-- HTML formatting
vim.g.html_indent_autotags = 'html,body'
vim.g.html_indent_inctags = 'p'

-- In filetypes that use tab indentation, render tabs as 4 spaces
vim.api.nvim_create_autocmd('FileType', {
    group = augroup,
    pattern = 'go',
    command = 'setlocal tabstop=4',
})


-----------
-- MAPPINGS
-----------

-- For keys that are safe to be mapped, see: https://vim.fandom.com/wiki/Unused_keys

-- Exit insert/command mode with jk
keymap.set('i', 'jk', '<Esc>')
keymap.set('c', 'jk', '<Esc>')

-- Quick exit (:qall) with Ctrl-q
keymap.set('n', '<C-q>', '<Cmd>qall<CR>')

-- Close current buffer (:q) with Alt-q
keymap.set('n', '<A-q>', '<Cmd>q<CR>')

-- Quick save all open buffers with Ctrl-s
keymap.set('n', '<C-s>', '<Cmd>wall<CR>')
keymap.set('i', '<C-s>', '<C-o><Cmd>wall<CR>')

-- Simple copy and paste to/from system clipboard with Ctrl-c in visual mode
-- and Ctrl-v in insert mode
keymap.set('v', '<C-c>', '"+y')
keymap.set('i', '<C-v>', '<C-\\><C-o>"+P')

-- Navigate between windows in normal mode with Alt and hjkl
keymap.set('n', '<A-h>', '<C-w>h')
keymap.set('n', '<A-j>', '<C-w>j')
keymap.set('n', '<A-k>', '<C-w>k')
keymap.set('n', '<A-l>', '<C-w>l')

-- Resize windows with Alt and arrow keys
keymap.set('n', '<A-Up>',    '<C-w>2-')
keymap.set('n', '<A-Down>',  '<C-w>2+')
keymap.set('n', '<A-Left>',  '<C-w>4<')
keymap.set('n', '<A-Right>', '<C-w>4>')

-- Shortcuts for jumping to start of line (H) or end of line (L)
keymap.set({'n', 'x'}, 'H', '^')
keymap.set({'n', 'x'}, 'L', '$')

-- Move cursor in insert mode with Alt and hjkl
keymap.set('i', '<A-h>', '<Left>')
keymap.set('i', '<A-j>', '<Down>')
keymap.set('i', '<A-k>', '<Up>')
keymap.set('i', '<A-l>', '<Right>')

-- Visual mode: Extend selection to parent node with "."
-- ("an" will be remapped to "around next" by mini.ai)
local _an_keymap = vim.fn.maparg('an', 'x', false, true)
keymap.set('x', '.', _an_keymap.callback, { desc = 'Extend selection to parent node' })

-- Visual mode: Move selected lines upwards/downwards with Alt-j/k
keymap.set('x', '<A-j>', ":m '>+1<CR>gv=gv")
keymap.set('x', '<A-k>', ":m '<-2<CR>gv=gv")

-- Visual mode: Stay in visual mode when indenting
keymap.set('v', '<', '<gv')
keymap.set('v', '>', '>gv')

-- Use space as a "modifier prefix" for alternative functions of regular commands
-- (e.g. yank to system clipboard) or for random shortcuts.
keymap.set({'n', 'x'}, ' ', '<Nop>')

-- Prefix yank/delete/change/paste commands to use system clipboard
keymap.set({'n', 'x'}, ' y', '"+y', { desc = 'Yank (clipboard)' })
keymap.set({'n', 'x'}, ' Y', '"+y$', { desc = 'Yank rest of line (clipboard)' })
keymap.set({'n', 'x'}, ' d', '"+d', { desc = 'Delete (clipboard)' })
keymap.set({'n', 'x'}, ' D', '"+D', { desc = 'Delete rest of line (clipboard)' })
keymap.set({'n', 'x'}, ' c', '"+c', { desc = 'Change (clipboard)' })
keymap.set({'n', 'x'}, ' C', '"+C', { desc = 'Change rest of line (clipboard)' })
keymap.set({'n', 'x'}, ' p', '"+p', { desc = 'Paste after cursor (clipboard)' })
keymap.set({'n', 'x'}, ' P', '"+P', { desc = 'Paste before cursor (clipboard)' })

-- Paste from system clipboard on a new line (before/after the current line)
keymap.set('n', ' lp', '<Cmd>:put +<CR>', { desc = 'Paste on new line below cursor (clipboard)' })
keymap.set('n', ' lP', '<Cmd>:put! +<CR>', { desc = 'Paste on new line above cursor (clipboard)' })

-- Select previously changed or yanked text (e.g. pasted text) in visual mode
keymap.set('n', ' v', '`[v`]', { desc = 'Select previously changed/yanked text' })

-- Insert empty line(s) below or above current line without moving the cursor
keymap.set('n', ' o', function()
    local line = vim.api.nvim_win_get_cursor(0)[1]
    local repeated = vim.fn['repeat']({''}, vim.v.count1)
    vim.api.nvim_buf_set_lines(0, line, line, true, repeated)
end, { desc = 'Insert empty line below cursor' })
keymap.set('n', ' O', function()
    local line = vim.api.nvim_win_get_cursor(0)[1] - 1
    local repeated = vim.fn['repeat']({''}, vim.v.count1)
    vim.api.nvim_buf_set_lines(0, line, line, true, repeated)
end, { desc = 'Insert empty line above cursor' })

-- LSP mappings (more in plugins.lua)
keymap.set('n', 'K', vim.lsp.buf.hover)
keymap.set('n', 'gq', vim.lsp.buf.format, { desc = 'Auto-format file (LSP)' })


----------
-- PLUGINS
----------

require('init.theme')
require('init.plugins')