vim.g.mapleader = " "
vim.g.maplocalleader = ","

-- FIX to create spell dir if not existent
local spelldir = vim.fn.stdpath("data") .. "/site/spell"
if not vim.loop.fs_stat(spelldir) then
  vim.fn.mkdir(spelldir, "p")
end

vim.opt.autoindent = true
vim.opt.backupdir = { vim.fn.stdpath("state") .. "/nvim/backup//" } -- don't store backup in files dir
vim.opt.clipboard = "unnamedplus" -- sync with system clipboard
vim.opt.conceallevel = 2
vim.opt.expandtab = true -- spaces instead of tabs
vim.opt.guifont = "Fira Code Nerd Font:h1"
vim.opt.ignorecase = true
vim.opt.mouse = "a" -- mouse for all modes
vim.opt.number = true
vim.opt.relativenumber = true
vim.opt.scrolloff = 4 -- lines of context
vim.opt.shiftround = true -- round indent
vim.opt.shiftwidth = 0 -- use tabstop value
vim.opt.shortmess:append({ c = true })
vim.opt.signcolumn = "yes"
vim.opt.smartcase = true
vim.opt.splitbelow = true
vim.opt.splitright = true
vim.opt.tabstop = 2
vim.opt.termguicolors = true
vim.opt.undofile = true
vim.opt.undolevels = 10000
vim.opt.updatetime = 300
vim.opt_local.spell = true
vim.opt_local.spelllang = { "en", "de_20" } -- all English regions and new German spelling

require("catppuccin").setup({
  compile_path = vim.fn.stdpath("cache") .. "/catppuccin", -- fix issue of writing to nix store
  integrations = {
    which_key = true,
  },
})
vim.cmd.colorscheme("catppuccin-macchiato")

vim.o.timeout = true
vim.o.timeoutlen = 500
local wk = require("which-key")

require("noice").setup({
  lsp = {
    -- override markdown rendering so that **cmp** and other plugins use **Treesitter**
    override = {
      ["vim.lsp.util.convert_input_to_markdown_lines"] = true,
      ["vim.lsp.util.stylize_markdown"] = true,
      ["cmp.entry.get_documentation"] = true,
    },
    progress = {
      enabled = false,
    },
  },
  -- you can enable a preset for easier configuration
  presets = {
    bottom_search = true, -- use a classic bottom cmdline for search
    command_palette = true, -- position the cmdline and popupmenu together
    long_message_to_split = true, -- long messages will be sent to a split
    inc_rename = false, -- enables an input dialog for inc-rename.nvim
    lsp_doc_border = false, -- add a border to hover docs and signature help
  },
})

wk.register({
  f = {
    name = "find",
    f = { "<cmd>Telescope find_files<cr>", "find file" },
    g = { "<cmd>Telescope live_grep<cr>", "live grep" },
    b = { "<cmd>Telescope buffers<cr>", "find buffer" },
  },
}, { prefix = "<leader>" })

require("neogit").setup({
  disable_commit_confirmation = true,
})
wk.register({
  g = { "<cmd>Neogit<cr>", "git" },
}, { prefix = "<leader>" })

require("nvim-treesitter.configs").setup({
  sync_install = false,
  auto_install = false,
  highlight = {
    enable = true,
    additional_vim_regex_highlighting = true,
  },
})

local cmp = require("cmp")
local luasnip = require("luasnip")
cmp.setup({
  snippet = {
    -- REQUIRED - you must specify a snippet engine
    expand = function(args)
      require("luasnip").lsp_expand(args.body)
    end,
  },
  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.
    ["<Tab>"] = cmp.mapping(function(fallback)
      if cmp.visible() then
        cmp.select_next_item()
      elseif luasnip.expand_or_jumpable() then
        luasnip.expand_or_jump()
      else
        fallback()
      end
    end, { "i", "s" }),
    ["<S-Tab>"] = cmp.mapping(function(fallback)
      if cmp.visible() then
        cmp.select_prev_item()
      elseif luasnip.jumpable(-1) then
        luasnip.jump(-1)
      else
        fallback()
      end
    end, { "i", "s" }),
  }),
  sources = {
    { name = "nvim_lsp" },
    { name = "luasnip" },
    { name = "buffer" },
  },
})

-- The nvim-cmp almost supports LSP's capabilities so You should advertise it to LSP servers..
local capabilities = require("cmp_nvim_lsp").default_capabilities()

local lspconfig = require("lspconfig")
local on_attach_def = function(_, bufnr)
  wk.register({
    K = { vim.lsp.buf.hover, "show info" },
    ["<leader>l"] = {
      name = "lsp",
      d = { vim.diagnostic.open_float, "open diagnostic window" },
      n = { vim.diagnostic.goto_next, "next error" },
      p = { vim.diagnostic.goto_prev, "prev error" },
      c = { vim.lsp.buf.code_action, "code action" },
      r = { vim.lsp.buf.rename, "rename" },
      f = {
        function()
          vim.lsp.buf.format({ async = true })
        end,
        "format",
      },
    },
    g = {
      name = "goto",
      r = { vim.lsp.buf.references, "references" },
      d = { vim.lsp.buf.definition, "definition" },
      D = { vim.lsp.buf.declaration, "declaration" },
      i = { vim.lsp.buf.implementation, "implementation" },
      t = { vim.lsp.buf.type_definition, "type defininition" },
    },
  }, { noremap = true, silent = true, buffer = bufnr })
end

---merge tables
---@param ... table[]
---@return table
local function table_merge(...)
  local tables_to_merge = { ... }
  assert(#tables_to_merge > 1, "There should be at least two tables to merge them")

  for k, t in ipairs(tables_to_merge) do
    assert(type(t) == "table", string.format("Expected a table as function parameter %d", k))
  end

  local result = tables_to_merge[1]

  for i = 2, #tables_to_merge do
    local from = tables_to_merge[i]
    for k, v in pairs(from) do
      if type(v) == "table" then
        result[k] = result[k] or {}
        result[k] = table_merge(result[k], v)
      else
        result[k] = v
      end
    end
  end

  return result
end

local lspconfig_default_options = {
  on_attach = on_attach_def,
  capabilities = capabilities,
  flags = {
    debounce_text_changes = 100,
  },
}

---function to add default options to lspconfig
---@param lsp string
---@param options table
---@return nil
local function lspconfig_setup(lsp, options)
  local final_options = table_merge(lspconfig_default_options, options)
  lspconfig[lsp].setup(final_options)
end

local servers = { "nil_ls", "pylsp" }
for _, lsp in ipairs(servers) do
  lspconfig_setup(lsp, {})
end

lspconfig_setup("lua_ls", {
  on_attach = on_attach_def,
  capabilities = capabilities,
  settings = {
    Lua = {
      runtime = {
        -- Tell the language server which version of Lua you're using (most likely LuaJIT in the case of Neovim)
        version = "LuaJIT",
      },
      diagnostics = {
        -- Get the language server to recognize the `vim` global
        globals = { "vim" },
      },
      workspace = {
        -- Make the server aware of Neovim runtime files
        library = vim.api.nvim_get_runtime_file("", true),
        checkThirdParty = false,
      },
      -- Do not send telemetry data containing a randomized but unique identifier
      telemetry = {
        enable = false,
      },
      format = {
        enable = false,
      },
    },
  },
})

local lsp_lines = require("lsp_lines")
lsp_lines.setup()
-- Disable virtual_text since it's redundant due to lsp_lines.
vim.diagnostic.config({
  virtual_text = false,
})
wk.register({
  t = {
    name = "toggle",
    l = { lsp_lines.toggle, "lsp lines" },
  },
  { prefix = "<leader>" },
})

require("dashboard").setup({
  theme = "hyper",
  config = {
    packages = { enable = true },
    week_header = {
      enable = true,
    },
  },
})

require("lualine").setup({
  options = {
    icons_enabled = true,
    theme = "auto",
    component_separators = "|",
    section_separators = { left = "", right = "" },
    disabled_filetypes = {
      statusline = {},
      winbar = {},
    },
    ignore_focus = {},
    always_divide_middle = true,
    globalstatus = false,
    refresh = {
      statusline = 1000,
      tabline = 1000,
      winbar = 1000,
    },
  },
  sections = {
    lualine_a = {
      { "mode", separator = { left = "" }, right_padding = 2 },
    },
    lualine_b = { "branch", "diff", "diagnostics" },
    lualine_c = { "filename", "lsp_progress" },
    lualine_x = { "encoding", "fileformat", "filetype" },
    lualine_y = { "progress" },
    lualine_z = {
      { "location", separator = { right = "" }, left_padding = 2 },
    },
  },
  inactive_sections = {
    lualine_a = {},
    lualine_b = {},
    lualine_c = { "filename" },
    lualine_x = { "location" },
    lualine_y = {},
    lualine_z = {},
  },
  tabline = {},
  winbar = {},
  inactive_winbar = {},
  extensions = {},
})

require("Comment").setup()

require("nvim-treesitter.configs").setup({
  context_commentstring = {
    enable = true,
  },
})

require("nvim-surround").setup({})