local fn = vim.fn

-- boostrap packer
local install_path = fn.stdpath('data') .. '/site/pack/packer/opt/packer.nvim'
local packer_bootstrap
if fn.empty(fn.glob(install_path)) > 0 then
    packer_bootstrap = fn.system({
        'git', 'clone', 'https://github.com/wbthomason/packer.nvim',
        install_path
    })
end

-- run PackerSync everytime plugins.lua is updated
vim.cmd([[
  augroup packer_user_config
    autocmd!
    autocmd BufWritePost plugins.lua source <afile> | PackerSync
  augroup end
]])

vim.cmd([[packadd packer.nvim]])

-- initialize plugins
return require('packer').startup(function(use)
    -- let packer manage itself
    use({ 'wbthomason/packer.nvim', opt = true })

    -- theme
    use("ishan9299/nvim-solarized-lua")

    -- commenting
    use {
        'numToStr/Comment.nvim',
        config = function() require('Comment').setup({}) end
    }

    -- session handling
    use('tpope/vim-obsession')
    use('dhruvasagar/vim-prosession')

    -- tabline
    use {
        'kdheepak/tabline.nvim',
        config = function()
            require 'tabline'.setup {
                enable = true,
                options = { show_bufnr = true, show_filename_only = true }
            }
        end,
        requires = {
            { 'hoob3rt/lualine.nvim' },
            { 'kyazdani42/nvim-web-devicons', opt = true }
        }
    }

    -- status line
    use {
        'nvim-lualine/lualine.nvim',
        requires = { 'kyazdani42/nvim-web-devicons', opt = true },
        config = function()
            require('lualine').setup({
                options = { globalstatus = true },
                sections = {
                    lualine_c = { { "filename", path = 1 }, "require('lsp-status').status()" }
                },
                extensions = { "toggleterm" }
            })
        end
    }

    -- blankline
    use({
        "lukas-reineke/indent-blankline.nvim",
        config = function()
            require("indent_blankline").setup {
                char = "┊",
                buftype_exclude = { "terminal", "help", "nofile" },
                filetype_exclude = { 'help', 'packer' },
                show_trailing_blankline_indent = false
            }
        end
    })

    -- git
    use('tpope/vim-fugitive')
    use({
        'lewis6991/gitsigns.nvim',
        requires = { 'nvim-lua/plenary.nvim' },
        config = function() require('gitsigns').setup() end
    })
    use("junegunn/gv.vim")

    -- autocompletion
    use({
        "L3MON4D3/LuaSnip",
        requires = { "rafamadriz/friendly-snippets" },
        config = function()
            require("luasnip.loaders.from_vscode").lazy_load()
        end
    })
    use({
        "hrsh7th/nvim-cmp",
        requires = {
            "hrsh7th/cmp-nvim-lsp", "hrsh7th/cmp-buffer", "hrsh7th/cmp-path",
            "hrsh7th/cmp-cmdline", "hrsh7th/cmp-git", "hrsh7th/cmp-nvim-lua",
            "saadparwaiz1/cmp_luasnip", "hrsh7th/cmp-nvim-lsp-signature-help",
            "davidsierradz/cmp-conventionalcommits", "hrsh7th/cmp-nvim-lua",
            "hrsh7th/cmp-calc"
        },
        config = function() require('plugins.nvim-cmp') end,
    })

    -- language server
    use {
        'junnplus/nvim-lsp-setup',
        requires = {
            'neovim/nvim-lspconfig',
            'williamboman/nvim-lsp-installer',

            -- additional rust tools
            "simrat39/rust-tools.nvim",

            -- highlight current symbol
            "RRethy/vim-illuminate",

            -- lua plugin development
            "folke/lua-dev.nvim",

            -- lsp status
            "nvim-lua/lsp-status.nvim",
        },
        config = function() require('plugins.nvim-lsp-setup') end,
    }

    -- null-ls
    use {
        "jose-elias-alvarez/null-ls.nvim",
        requres = {
            { "nvim-lua/plenary.nvim" },
        },
        config = function()
            require("null-ls").setup({
                sources = {
                    require("null-ls").builtins.formatting.prettier,
                },
                on_attach = function(client)
                    local utils = require("nvim-lsp-setup.utils")
                    utils.format_on_save(client)
                end,
            })
        end,
    }

    -- treesitter
    use({
        'nvim-treesitter/nvim-treesitter',
        config = function() require('plugins.treesitter') end,
        run = ':TSUpdate'
    })

    -- Telescope
    use({
        "nvim-telescope/telescope.nvim",
        requires = {
            { "nvim-lua/plenary.nvim" },
            { "nvim-telescope/telescope-fzf-native.nvim", run = "make" },
            { "nvim-telescope/telescope-ui-select.nvim" },
        },
        config = function() require("plugins.telescope") end
    })

    -- automatic pairs
    use({ "Raimondi/delimitMate" })

    -- markdown preview
    use({ "iamcco/markdown-preview.nvim", run = ":call mkdp#util#install()" })

    -- terminal
    use({
        "akinsho/nvim-toggleterm.lua",
        config = function()
            require("toggleterm").setup({ size = 32, open_mapping = [[<F4>]] })
        end
    })

    -- buffer closing
    use({ "sar/bbye.nvim" })

    -- ansible filetype
    use({ "pearofducks/ansible-vim" })

    -- nvim-notify
    use({ "rcarriga/nvim-notify",
        config = function()
            require("notify").setup({
                stages = "fade",
            })
            vim.notify = require("notify")
        end
    })

    if packer_bootstrap then require('packer').sync() end
end)