-- general settings
local vim = vim
vim.opt.number = true                       -- show line numbers
vim.opt.relativenumber = true               -- relative line numbers for navigation
vim.opt.clipboard:append { 'unnamedplus' }  -- use clipboard
vim.opt.mouse = "a"                         -- enable mouse support
vim.opt.updatetime = 250                    -- Faster updates (e.g., for LSP diagnostics)
vim.opt.timeoutlen = 500                    -- Shorter timeout for key sequences
vim.opt.splitright = true                   -- vsplit opens new buffer on the right side

-- tab and indentation settings
vim.opt.expandtab = true            -- tabs are converted to spaces
vim.opt.shiftwidth = 4              -- 4 spaces for indentation
vim.opt.tabstop = 4                 -- 4 spaces for tabs
vim.opt.softtabstop = 4             -- 4 spaces for tab key
vim.opt.autoindent = true           -- Copy indent from previous line
vim.opt.cindent = true
vim.opt.cino = ":0l1(0"

-- plugin preparation
vim.opt.signcolumn = "yes"                              -- LSP diagnostics
vim.opt.termguicolors = true                            -- enable true colors
vim.opt.completeopt = { "menu", "menuone", "noselect" } -- required for nvim-cmp
vim.g.mapleader = " "               -- Set leader to space
vim.g.maplocalleader = "\\"         -- Set local leader to backslash


-- keymap
vim.keymap.set('n', '<leader>gd', vim.lsp.buf.definition, { desc = 'Go to definition' })


-- packages 
vim.pack.add({
    -- colorscheme
    { src = 'https://github.com/sainnhe/gruvbox-material' },

    -- status line
    { src = 'https://github.com/nvim-tree/nvim-web-devicons' },
    { src = 'https://github.com/nvim-lualine/lualine.nvim' },

    -- enhance language server capabilities (i guess)
    { src = 'https://github.com/nvim-treesitter/nvim-treesitter', version = 'main' },

    -- autoconfigure language servers
    { src = 'https://github.com/neovim/nvim-lspconfig' },

    -- install language servers
    { src = 'https://github.com/mason-org/mason.nvim' },
    { src = 'https://github.com/mason-org/mason-lspconfig.nvim' },

    -- autocomplete
    { src = 'https://github.com/hrsh7th/cmp-nvim-lsp' },
    { src = 'https://github.com/hrsh7th/cmp-buffer' },
    { src = 'https://github.com/hrsh7th/cmp-path' },
    { src = 'https://github.com/hrsh7th/cmp-cmdline' },
    { src = 'https://github.com/hrsh7th/nvim-cmp' },
    { src = 'https://github.com/hrsh7th/cmp-vsnip' },
    { src = 'https://github.com/hrsh7th/vim-vsnip' },

    -- telescope
    { src = 'https://github.com/nvim-lua/plenary.nvim' },
    { src = 'https://github.com/nvim-telescope/telescope.nvim', tag = 'v0.1.9' },

    -- latex support
    { src = 'https://github.com/lervag/vimtex' },
})



-- init plugin gruvbox-material
vim.g.gruvbox_material_background             = 'hard'
vim.g.gruvbox_material_foreground             = 'material'
vim.g.gruvbox_material_enable_italic          = true
vim.g.gruvbox_material_disable_italic_comment = false
vim.g.gruvbox_material_better_performance     = 1
vim.cmd.colorscheme('gruvbox-material')


-- init plugin lualine
require('lualine').setup({
  options = {
    icons_enabled = true,
    theme = 'auto',
    component_separators = { left = '', right = ''},
    section_separators = { left = '', right = ''},
    disabled_filetypes = {
      statusline = {},
      winbar = {},
    },
    ignore_focus = {},
    always_divide_middle = true,
    always_show_tabline = true,
    globalstatus = false,
    refresh = {
      statusline = 1000,
      tabline = 1000,
      winbar = 1000,
      refresh_time = 16, -- ~60fps
      events = {
        'WinEnter',
        'BufEnter',
        'BufWritePost',
        'SessionLoadPost',
        'FileChangedShellPost',
        'VimResized',
        'Filetype',
        'CursorMoved',
        'CursorMovedI',
        'ModeChanged',
      },
    }
  },
  sections = {
    lualine_a = {'mode'},
    lualine_b = {'branch', 'diff', 'diagnostics'},
    lualine_c = {'filename'},
    lualine_x = {'encoding', 'fileformat', 'filetype'},
    lualine_y = {'progress'},
    lualine_z = {'location'}
  },
  inactive_sections = {
    lualine_a = {},
    lualine_b = {},
    lualine_c = {'filename'},
    lualine_x = {'location'},
    lualine_y = {},
    lualine_z = {}
  },
  tabline = {},
  winbar = {},
  inactive_winbar = {},
  extensions = {}
})


-- treesitter
require'nvim-treesitter'.install { 'cpp' }


-- cmp
local cmp = require("cmp")
cmp.setup({
    snippet = {
        expand = function(args)
            vim.fn["vsnip#anonymous"](args.body)
        end,
    },
    window = {
        -- completion = cmp.config.window.bordered(),
        -- documentation = cmp.config.window.bordered(),
    },
    mapping = cmp.mapping.preset.insert({
        ['<C-b>'] = cmp.mapping.scroll_docs(-4),
        ['<C-f>'] = cmp.mapping.scroll_docs(4),
        ['<C-Space>'] = cmp.mapping.complete(),
        ['<C-e>'] = cmp.mapping.abort(),
        ['<CR>'] = cmp.mapping.confirm({ select = true }), -- Accept currently selected item. Set `select` to `false` to only confirm explicitly selected items.
    }),
    sources = cmp.config.sources({
        { name = 'nvim_lsp' },
        { name = 'vsnip' },
    }, {
        { name = 'buffer' },
    })
})

-- Use buffer source for `/` and `?` (if you enabled `native_menu`, this won't work anymore).
cmp.setup.cmdline({ '/', '?' }, {
    mapping = cmp.mapping.preset.cmdline(),
    sources = {
        { name = 'buffer' }
    }
})

-- Use cmdline & path source for ':' (if you enabled `native_menu`, this won't work anymore).
cmp.setup.cmdline(':', {
    mapping = cmp.mapping.preset.cmdline(),
    sources = cmp.config.sources(
    {
        { name = 'path' }
    },
    {
        { name = 'cmdline' }
    }
    ),
    matching = { disallow_symbol_nonprefix_matching = false }
})


-- language server installation (via mason)
local capabilities = require('cmp_nvim_lsp').default_capabilities()
require("mason").setup()
require("mason-lspconfig").setup({
    ensure_installed = { "lua_ls", "clangd", "pyright", "djlsp" },
    automatic_installation = true,
    handlers = {
        function(server_name)
            require("lspconfig")[server_name].setup({
                capabilities = capabilities,
                -- on_attach = your_on_attach,  -- if you have one
                -- settings = {...},            -- per-server overrides go here if needed
            })
        end,
    },
    -- Optional: override specific servers if you really need something special
    -- ["rust_analyzer"] = function()
        --   require("rust-tools").setup({})
        -- end,
})


-- language server enabling
vim.lsp.enable({
    'lua_ls',
    'clangd',
    'pyright',
    'djlsp'
})



local builtin = require('telescope.builtin')
vim.keymap.set('n', '<leader>ff', builtin.find_files, { desc = 'Telescope find files' })
vim.keymap.set('n', '<leader>fg', builtin.live_grep, { desc = 'Telescope live grep' })
vim.keymap.set('n', '<leader>fb', builtin.buffers, { desc = 'Telescope buffers' })
vim.keymap.set('n', '<leader>fh', builtin.help_tags, { desc = 'Telescope help tags' })



-- vimtex (latex support)
require('lualine').setup({
    ft = { "tex", "bib" },
    dependencies = { "nvim-treesitter/nvim-treesitter" },
    config = function()
        vim.g.vimtex_view_method = "mupdf"
    end
})