------------------------------------------------------------
-- Filip's neovim config
------------------------------------------------------------

------------------------------------------------------------
-- General / UI settings
------------------------------------------------------------
vim.opt.number         = true
vim.opt.relativenumber = true
vim.opt.title          = true
vim.opt.background     = "dark"
vim.opt.laststatus     = 2
vim.opt.showmode       = true
vim.opt.showcmd        = false
vim.opt.ruler          = true
vim.opt.cursorline     = true

-- Modern / visual quality
vim.opt.termguicolors  = true
vim.opt.signcolumn     = "yes"
vim.opt.pumblend       = 10
vim.opt.winblend       = 10

------------------------------------------------------------
-- Window / split behavior
------------------------------------------------------------
vim.opt.splitbelow     = true
vim.opt.splitright     = true

------------------------------------------------------------
-- Timing & performance related
------------------------------------------------------------
vim.opt.updatetime     = 50
vim.opt.timeoutlen     = 400
vim.opt.ttimeoutlen    = 10

------------------------------------------------------------
-- Backup, swap, undo
------------------------------------------------------------
vim.opt.undofile       = true
vim.opt.swapfile       = false
vim.opt.backup         = false
vim.opt.writebackup    = false

------------------------------------------------------------
-- Search and highlighting
------------------------------------------------------------
vim.opt.hlsearch       = false
vim.opt.ignorecase     = true
vim.opt.smartcase      = true
vim.opt.incsearch      = true
vim.opt.wildignore     = { "*.o", "*.obj", "*.bak", "*.exe" }

------------------------------------------------------------
-- Indentation and formatting
------------------------------------------------------------
vim.opt.autoindent     = true
vim.opt.cindent        = true
vim.opt.smartindent    = true
vim.opt.wrap           = false
vim.opt.scrolloff      = 5
vim.opt.completeopt    = { "menuone", "noinsert" }

------------------------------------------------------------
-- Clipboard and mouse
------------------------------------------------------------
vim.opt.clipboard:append("unnamedplus")
vim.opt.mouse          = "a"

------------------------------------------------------------
-- Session and history (shada = viminfo replacement)
------------------------------------------------------------
vim.opt.shada          = "'100,<50,s10,h"
vim.opt.shadafile      = vim.fn.expand("~/.local/state/nvim/shada/main.shada")

------------------------------------------------------------
-- Miscellaneous
------------------------------------------------------------
vim.opt.spelllang = { "en", "pl" }
vim.cmd("syntax on")
vim.opt.termguicolors = true
vim.cmd.colorscheme("pablo")

-- Transparency
vim.api.nvim_set_hl(0, "Normal",     { bg = "none", ctermbg = "none" })
vim.api.nvim_set_hl(0, "NormalFloat",{ bg = "none", ctermbg = "none" })
vim.api.nvim_set_hl(0, "SignColumn", { bg = "none" })
vim.api.nvim_set_hl(0, "FoldColumn", { bg = "none" })

------------------------------------------------------------
-- Autocommands
------------------------------------------------------------
local augroup = vim.api.nvim_create_augroup("UserAutocmds", { clear = true })

-- Reload any .lua file on save
vim.api.nvim_create_autocmd("BufWritePost", {
  group = augroup,
  pattern = vim.fn.stdpath("config") .. "/**/*.lua",
  callback = function()
    vim.cmd("source %")
    vim.notify("Lua config reloaded", vim.log.levels.INFO)
  end,
})

-- Remove trailing whitespace & final newlines, keep cursor
vim.api.nvim_create_autocmd("BufWritePre", {
  group = augroup,
  pattern = "*",
  callback = function()
    local pos = vim.fn.getpos(".")
    vim.cmd([[%s/\s\+$//e]])
    vim.cmd([[%s/\n\+\%$//e]])
    vim.fn.setpos(".", pos)
  end,
})

vim.api.nvim_create_autocmd("BufWritePost", {
  pattern = "*.tex",
  callback = function()
    -- Run tex-fmt on the current file
    vim.cmd("silent !tex-fmt %")
    -- Reload the buffer to reflect formatting changes
    vim.cmd("edit!")
  end,
})

------------------------------------------------------------
-- Key mappings
------------------------------------------------------------
vim.g.mapleader = " "

-- Helper function for cleaner keymap definitions
-- Defaults: noremap = true, silent = true
local function map(mode, lhs, rhs, opts)
  opts = opts or {}
  opts.noremap = opts.noremap ~= false   -- default true
  opts.silent  = opts.silent  ~= false   -- default true
  opts.desc    = opts.desc or nil        -- optional description

  vim.keymap.set(mode, lhs, rhs, opts)
end

-- Delete char before cursor + char under cursor
map('n', '<BS>', 'dBx', { desc = "Delete char before + under cursor" })

-- Insert blank line below current line and center view
map('n', 's', 'o<Esc>kzz', { desc = "Insert blank line below + center" })

-- Start substitute on current line (pre-filled :%s//g)
map('n', 'S', ':%s//g<Left><Left>', { silent = false, desc = "Substitute on current line" })
-- Note: silent = false because it enters command-line mode

-- Yank to end of line (consistent with D and C behavior)
map('n', 'Y', 'y$', { desc = "Yank to end of line" })

-- Swap current line with the one below
map('n', '-', 'ddp', { desc = "Swap line with next" })

-- Swap current line with the one above
map('n', '_', 'ddkP', { desc = "Swap line with previous" })

-- System clipboard yank & paste (line / WORD)
map('n', '<C-j>', '"+yy', { desc = "Yank line to system clipboard" })
map('n', '<C-c>', '"+yW', { desc = "Yank WORD to system clipboard" })
map('n', '<C-k>', '"+p',  { desc = "Paste from system clipboard after cursor" })

-- Yank selection to system clipboard
map('v', '<C-j>', '"+y', { desc = "Yank selection to system clipboard" })

-- Toggle buffers
map('n', '<Tab><Tab>', '<C-^>', { desc = "Toggle last / alternate buffer" })

------------------------------------------------------------
-- Tabs & indentation
------------------------------------------------------------
vim.opt.tabstop = 4
vim.opt.shiftwidth = 4
vim.opt.expandtab = true

------------------------------------------------------------
-- Filetype-specific mappings
------------------------------------------------------------
vim.api.nvim_create_autocmd("FileType", {
  group = augroup,
  pattern = "python",
  command = "map <F5> :w<CR>:!python3 %<CR>",
})

------------------------------------------------------------
-- lazy.nvim
------------------------------------------------------------
require("config.lazy")

------------------------------------------------------------
-- luasnip
------------------------------------------------------------
require("luasnip").config.set_config({ -- Setting LuaSnip config

  -- Enable autotriggered snippets
  enable_autosnippets = true,

  -- Use Tab (or some other key if you prefer) to trigger visual selection
  store_selection_keys = "<Tab>",
})

vim.cmd[[
" Use Tab to expand and jump through snippets
imap <silent><expr> <Tab> luasnip#expand_or_jumpable() ? '<Plug>luasnip-expand-or-jump' : '<Tab>'
smap <silent><expr> <Tab> luasnip#jumpable(1) ? '<Plug>luasnip-jump-next' : '<Tab>'

" Use Shift-Tab to jump backwards through snippets
imap <silent><expr> <S-Tab> luasnip#jumpable(-1) ? '<Plug>luasnip-jump-prev' : '<S-Tab>'
smap <silent><expr> <S-Tab> luasnip#jumpable(-1) ? '<Plug>luasnip-jump-prev' : '<S-Tab>'
]]

-- Load snippets from fiadra/chadsnips
require("luasnip.loaders.from_vscode").lazy_load()