local fn,api = vim.fn,vim.api
local packer_dir = fn.stdpath('data') .. '/site/pack/packer/opt/packer.nvim'

if fn.empty(fn.glob(packer_dir)) > 0 then
    fn.system({'git', 'clone', 'https://github.com/wbthomason/packer.nvim', packer_dir})
    api.nvim_command('packadd packer.nvim')
end

-- Require since we use 'packer' as opt
api.nvim_command [[packadd packer.nvim]]

return require('packer').startup(
    function(use)
        use {'wbthomason/packer.nvim', opt = true}

        ---------------------------------
        -- Plugins used by many others --
        ---------------------------------
        use {'kyazdani42/nvim-web-devicons', module = 'nvim-web-devicons'}
        use {'nvim-lua/plenary.nvim', module = 'plenary'}
        use {'nvim-lua/popup.nvim', module = 'popup'}

        --------
        -- UI --
        --------
        local ui = require('modules.ui')
        use {
            'goolord/alpha-nvim',
            event = 'VimEnter',
            config = ui.dashboard_conf
        }
        use {
            'famiu/feline.nvim',
            wants = 'nvim-web-devicons',
            config = ui.statusline_conf
        }
        use {
            'akinsho/bufferline.nvim',
            event = {'BufRead', 'BufNewFile'},
            config = ui.bufferline_conf
        }
        use {
            'kyazdani42/nvim-tree.lua',
            cmd = 'NvimTreeToggle',
            setup = ui.nvimtree_conf,
            -- FIX: when all the options are migrated to setup()
            config = function()
                require('nvim-tree').setup {
                    open_on_setup = false,
                    auto_close = true,
                    hijack_cursor = true,
                    update_cwd = true,
                    lsp_diagnostics = true,
                    view = {
                        auto_resize = false
                    }
                }
            end
        }
        use {
            'folke/which-key.nvim',
            event = 'VimEnter',
            config = ui.whichkey_conf
        }
        use {
            'lewis6991/gitsigns.nvim',
            event = {'BufRead', 'BufNewFile'},
            wants = 'plenary.nvim',
            config = ui.gitsigns_conf
        }

        ------------
        -- Editor --
        ------------
        local editor = require('modules.editor')
        use {
            'norcalli/nvim-colorizer.lua',
            cmd = 'ColorizerToggle',
            config = editor.colorizer_conf
        }
        use {
            'RRethy/vim-illuminate',
            event = {'BufReadPre', 'BufNewFile'}
        }
        use {
            'lukas-reineke/indent-blankline.nvim',
            after = 'nvim-treesitter',
            config = editor.blankline_conf
        }
        use { -- TODO: config (lua -> fennel) + learn clojure, fennel, guile scheme
            'Olical/conjure',
            ft = {'clojure', 'fennel', 'scheme'},
            requires = {{'Olical/aniseed', config = editor.aniseed_conf}}
        }
        use {
            'nvim-treesitter/nvim-treesitter',
            run = ':TSUpdate',
            event = 'BufRead',
            config = editor.treesitter_conf
        }
        use {
            'p00f/nvim-ts-rainbow',
            after = 'nvim-treesitter',
             -- Putting config into `treesitter_conf` doesn't work for some reason
            config = editor.rainbow_conf
        }
        use {
            'romgrk/nvim-treesitter-context',
            after = 'nvim-treesitter'
        }
        use {
            'nvim-treesitter/nvim-treesitter-textobjects',
            after = 'nvim-treesitter'
        }
        use {
            'andymass/vim-matchup',
            after = 'nvim-treesitter',
            config = editor.matchup_conf
        }
        use {
            'machakann/vim-sandwich',
            keys = 's'
        }
        use {
            'phaazon/hop.nvim',
            cmd = {'HopChar1', 'HopChar2', 'HopWord', 'HopPattern', 'HopLine'},
            config = editor.hop_conf
        }
        use {
            'hrsh7th/vim-eft',
            event = {'BufRead', 'BufNewFile'},
            setup = editor.eft_conf
        }
        use {
            'junegunn/vim-easy-align',
            cmd = 'EasyAlign'
        }
        use {
            'terrortylor/nvim-comment',
            keys = 'gc',
            config = editor.comment_conf
        }
        use {
            'editorconfig/editorconfig-vim',
            ft = {'go', 'rust', 'python', 'c', 'cpp', 'javascript', 'typescript', 'vim', 'zig'}
        }
        use { -- TODO: move to nvim-parinfer (lua)
            'eraserhd/parinfer-rust',
            run = 'cargo build --release',
            ft = {'clojure', 'lisp', 'scheme', 'fennel'}
        }
        use {
            'ahmedkhalf/project.nvim',
            event = 'BufEnter',
            config = editor.project_conf
        }

        ---------
        -- LSP --
        ---------
        local lsp = require('modules.lsp')
        use { -- TODO: scripts to install/update lsp servers
            'neovim/nvim-lspconfig',
            event = 'BufReadPre',
            wants = 'lsp_signature.nvim',
            requires = {{'ray-x/lsp_signature.nvim', opt = true}},
            config = lsp.lsp_conf
        }
        use {
            'nanotee/sqls.nvim',
            ft = {'sql', 'mysql', 'plsql'},
            wants = 'nvim-lspconfig',
            config = lsp.sqls_conf
        }
        use {
            'folke/trouble.nvim',
            cmd = {'Trouble', 'TroubleToggle', 'TroubleRefresh'},
            config = lsp.trouble_conf
        }
        -- use { -- FIX: conflict highlights with hop.nvim
        --     'folke/todo-comments.nvim',
        --     wants = 'plenary.nvim',
        --     event = 'BufRead',
        --     config = lsp.comments_conf
        -- }
        use {
            'simrat39/symbols-outline.nvim',
            cmd = {'SymbolsOutline', 'SymbolsOutlineOpen'},
            setup = lsp.outline_conf
        }
        use { -- TODO: scripts to install/update linters
            'mfussenegger/nvim-lint',
            event = 'BufRead',
            config = lsp.lint_conf
        }
        use { -- TODO: config, scripts to install/update dap servers
            'rcarriga/nvim-dap-ui',
            event = 'BufReadPre',
            wants = 'nvim-dap',
            requires = {{'mfussenegger/nvim-dap', config = lsp.dap_conf, opt = true}},
            config = lsp.dapui_conf
        }

        ----------------
        -- Completion --
        ----------------
        local completion = require('modules.completion')
        use {
            'hrsh7th/nvim-cmp',
            event = 'InsertEnter',
            wants = 'LuaSnip',
            requires = {{
                'L3MON4D3/LuaSnip',
                wants = 'friendly-snippets',
                requires = {{'rafamadriz/friendly-snippets', opt = true}},
                config = completion.snippets_conf,
                opt = true
            }},
            config = completion.cmp_conf
        }
        use {'saadparwaiz1/cmp_luasnip', after = 'nvim-cmp'}
        use {'hrsh7th/cmp-path', after = 'nvim-cmp'}
        use {'hrsh7th/cmp-buffer', after = 'nvim-cmp'}
        -- use {'hrsh7th/cmp-calc', after = 'nvim-cmp'}
        -- use {'f3fora/cmp-nuspell', after = 'nvim-cmp', rocks={'lua-nuspell'}}
        use {'f3fora/cmp-spell', after = 'nvim-cmp'}
        use {'hrsh7th/cmp-emoji', after = 'nvim-cmp'}
        -- use {'ray-x/cmp-treesitter', after = {'nvim-cmp', 'nvim-treesitter'}}
        use {'hrsh7th/cmp-nvim-lsp', after = {'nvim-cmp', 'nvim-lspconfig'}}
        -- use {
        --     'tzachar/cmp-tabnine',
        --     after = 'nvim-cmp',
        --     run = './install.sh',
        --     config = completion.tabnine_conf
        -- }
        use {'kdheepak/cmp-latex-symbols', after = {'nvim-cmp', 'vimtex'}}
        use {'andersevenrud/compe-tmux', after = 'nvim-cmp', branch = 'cmp'}
        use {'PaterJason/cmp-conjure', after = {'conjure', 'nvim-cmp'}}
        use {
            'windwp/nvim-autopairs',
            after = 'nvim-cmp',
            config = completion.autopairs_conf
        }
        -- use {
        --     'ms-jpq/coq_nvim',
        --     branch = 'coq',
        --     event = 'InsertEnter',
        --     run = ':COQdeps',
        --     wants = 'coq.artifacts',
        --     requires = {{'ms-jpq/coq.artifacts', branch = 'artifacts', opt = true}},
        --     setup = completion.coq_conf
        -- }
        use {
            'windwp/nvim-ts-autotag',
            ft = {
                'html', 'javascript', 'javascriptreact', 'typescript',
                'typescriptreact', 'vue', 'svelte'
            },
            wants = 'nvim-treesitter',
            config = completion.autotag_conf
        }

        -----------
        -- Tools --
        -----------
        local tools = require('modules.tools')
        use { -- TODO: watch out for fzf-lua
            'nvim-telescope/telescope.nvim',
            cmd = 'Telescope',
            wants = {
                'popup.nvim',
                'plenary.nvim',
                'telescope-symbols.nvim',
                'telescope-project.nvim',
                'telescope-fzf-native.nvim'
            },
            requires = {
                {'nvim-telescope/telescope-symbols.nvim', opt = true},
                {'nvim-telescope/telescope-project.nvim', opt = true},
                {'nvim-telescope/telescope-fzf-native.nvim', run = 'make', opt = true}
            },
            config = tools.telescope_conf
        }
        use { -- TODO: colors + config
            'pwntester/octo.nvim',
            cmd = 'Octo',
            wants = 'telescope.nvim',
            config = tools.octo_conf
        }
        use {
            'TimUntersberger/neogit',
            cmd = 'Neogit',
            wants = {'diffview.nvim', 'plenary.nvim'},
            requires = {{
                'sindrets/diffview.nvim',
                config = tools.diffview_conf,
                opt = true
            }},
            config = tools.neogit_conf
        }
        use { -- TODO: replace with code_runner.nvim
            'skywind3000/asynctasks.vim',
            cmd = {
                'AsyncTask',
                'AsyncTaskEdit',
                'AsyncTaskList',
                'AsyncTaskMacro'
            },
            wants = 'asyncrun.vim',
            requires = {{
                'skywind3000/asyncrun.vim',
                setup = tools.asynctasks_conf,
                opt = true
            }}
        }
        use {
            'iamcco/markdown-preview.nvim',
            run = 'cd app && yarn install',
            ft = {'markdown', 'rmd'},
            config = tools.markdown_preview_conf
        }
        use {
            'turbio/bracey.vim',
            run = 'npm install --prefix server',
            cmd = 'Bracey'
        }
        use {
            'folke/zen-mode.nvim',
            cmd = 'ZenMode',
            wants = 'twilight.nvim',
            requires = {{'folke/twilight.nvim', opt = true}},
            config = tools.zenmode_conf
        }
        use { -- shouldn't be lazy-loaded (global bindings don't work)
            'kristijanhusak/orgmode.nvim',
            ft = 'org',
            config = tools.orgmode_conf
        }
        use { -- TODO: config
            'lervag/vimtex',
            ft = 'tex',
            setup = tools.vimtext_conf
        }
        use {
            'windwp/nvim-spectre',
            event = {'BufRead', 'BufNewFile'},
            wants = 'plenary.nvim',
            config = tools.spectre_conf
        }
        use {
            'echuraev/translate-shell.vim',
            cmd = {'Trans', 'TransSelectDirection'},
            config = tools.translate_conf
        }
        use {
            'mbbill/undotree',
            cmd = 'UndotreeToggle',
            setup = tools.undotree_conf
        }
        use {
            'akinsho/toggleterm.nvim',
            cmd = 'ToggleTerm',
            config = tools.toggleterm_conf
        }
        -- use {
        --     'gelguy/wilder.nvim',
        --     run = ':UpdateRemotePlugins',
        --     event = 'CmdlineEnter',
        --     config = tools.wilder_conf
        -- }
        use {
            'karb94/neoscroll.nvim',
            event = 'WinScrolled',
            config = tools.neoscroll_conf
        }
        use {
            'michaelb/sniprun',
            run = 'bash ./install.sh 1',
            cmd = 'SnipRun',
            config = tools.sniprun_conf
        }
        use {
            'NTBBloodbath/rest.nvim',
            keys = {'<Plug>RestNvim', '<Plug>RestNvimPreview', '<Plug>RestNvimLast'},
            wants = {'plenary.nvim', 'nvim-treesitter'},
            run = ':TSInstall http',
            config = tools.rest_conf
        }
        use { -- TODO: move to formater.nvim
            'sbdchd/neoformat',
            cmd = 'Neoformat'
        }
        use {
            'folke/persistence.nvim',
            event = 'BufEnter',
            config = tools.session_conf
        }
        -- use {'dstein64/vim-startuptime', cmd = 'StartupTime'} -- Just for benchmarking

        -- TODO: dial.nvim, rust-tools.nvim, crates.nvim, go.nvim, clojure-vim/*,
        -- nvim-bqf, nvim-comment-frame, nvim-revJ.lua
    end
)