-- Automatically install packer
local fn = vim.fn
local install_path = fn.stdpath('data') .. '/site/pack/packer/start/packer.nvim'

if fn.empty(fn.glob(install_path)) > 0 then
  packer_bootstrap = fn.system({
    'git',
    'clone',
    '--depth',
    '1',
    'https://github.com/wbthomason/packer.nvim',
    install_path
  })
  vim.o.runtimepath = vim.fn.stdpath('data') .. '/site/pack/*/start/*,' .. vim.o.runtimepath
end

-- Use a protected call so we don't error out on first use
local status_ok, packer = pcall(require, 'packer')
if not status_ok then
  return
end

return require('packer').startup(function(use)
    -- Plugin/package manager.
    use 'wbthomason/packer.nvim'

    -- Required for a number of Lua plugins.
    use 'nvim-lua/plenary.nvim'

    -- Color schemes
    use 'sainnhe/gruvbox-material'
    use 'rebelot/kanagawa.nvim'
    use 'marko-cerovac/material.nvim'

    -- Telescope: fuzzy finder
    use {
        'nvim-telescope/telescope.nvim',
        requires = { 
            { 'nvim-lua/plenary.nvim' } 
        }
    }

    -- Native Telescope implementation based on FZF for performance.
    use {
        'nvim-telescope/telescope-fzf-native.nvim', 
        run = 'cmake -S. -Bbuild -DCMAKE_BUILD_TYPE=Release && cmake --build build --config Release && cmake --install build --prefix build' 
    }

    -- A pretty list for showing diagnostics, references, telescope results, 
    -- quickfix and location lists to help you solve all the trouble your code 
    -- is causing.
    use {
        'folke/trouble.nvim',
        requires = 'kyazdani42/nvim-web-devicons',
        config = function()
            require('trouble').setup()
        end
    }

    -- Treesitter: Neovim bindings for the Tree-sitter parser generator tool and 
    -- incremental parsing library.
    use {
        'nvim-treesitter/nvim-treesitter',
        run = ':TSUpdate'
    }

    -- Neovim-native LSP Implementation
    use 'neovim/nvim-lspconfig'

    -- nvim-cmp - completion plugin, used for LSP and Metals
    use {
        'hrsh7th/nvim-cmp',
        requires = {
            'hrsh7th/cmp-nvim-lsp', -- add once LSP is supported
            'hrsh7th/cmp-path',
            'hrsh7th/cmp-buffer'
        }
    }

    -- Metals, for Scala development.
    use {
        'scalameta/nvim-metals', 
        requires = { 'nvim-lua/plenary.nvim' },
        --ft = { 'scala', 'sbt' } -- this is busted for some reason.
    }

    -- Lualine (configures the bottom bars)
    use {
        'nvim-lualine/lualine.nvim',
        requires = 'kyazdani42/nvim-web-devicons'
    }

    -- bufferline - shows a bar at the top with open buffers
    -- using packer.nvim
    use {
        'akinsho/bufferline.nvim', 
        requires = 'kyazdani42/nvim-web-devicons',
        config = function()
            require('bufferline').setup()
        end
    }

    -- Floating terminal
    use 'voldikss/vim-floaterm'

    -- Show signs for Git
    use {
        'lewis6991/gitsigns.nvim',
        config = function()
            require('gitsigns').setup()
        end
    }

    -- Show unobtrusive indentation guides
    use {
        'lukas-reineke/indent-blankline.nvim',
        config = function()
            require('indent_blankline').setup()
        end
    }

    -- File manager for Neovim (backed by nnn)
    use {
        'luukvbaal/nnn.nvim',
        config = function() 
            require('nnn').setup()
        end
    }

    -- Improve startup time by replacing default filetype autocmds
    use 'nathom/filetype.nvim'

    -- Improve the core vim.ui
    use 'stevearc/dressing.nvim'

    -- Special highlighting and tracking for certain notable words
    use {
        'folke/todo-comments.nvim',
        requires = 'nvim-lua/plenary.nvim',
        config = function()
            require('todo-comments').setup()
        end
    }

end)