-- Install packer
local install_path = vim.fn.stdpath 'data' .. '/site/pack/packer/start/packer.nvim'

if vim.fn.empty(vim.fn.glob(install_path)) > 0 then
    vim.fn.execute('!git clone https://github.com/wbthomason/packer.nvim ' .. install_path)
end

vim.api.nvim_exec(
[[
augroup Packer
autocmd!
autocmd BufWritePost init.lua PackerCompile
augroup end
]],
false
)

local use = require('packer').use
require('packer').startup(function()
    -- Package manager
    use 'wbthomason/packer.nvim'

    -- UI to select things (files, grep results, open buffers...)
    use {
        'nvim-telescope/telescope.nvim',
        requires = {
            { 'nvim-lua/popup.nvim' },
            { 'nvim-lua/plenary.nvim' },
            { 'nvim-telescope/telescope-fzf-native.nvim', run = "make" },
            { 'nvim-telescope/telescope-media-files.nvim' }
        }
    }

    -- Add indentation guides even on blank lines
    use 'lukas-reineke/indent-blankline.nvim'

    -- Add git related info in the signs columns and popups
    use {
        'lewis6991/gitsigns.nvim',
        requires = { 'nvim-lua/plenary.nvim' }
    }

    -- Highlight, edit, and navigate code using a fast incremental parsing library
    use 'nvim-treesitter/nvim-treesitter'

    -- LSP
    use 'neovim/nvim-lspconfig'

    -- Autocompletion
    use 'hrsh7th/nvim-compe'

    -- Snippets
    use 'L3MON4D3/LuaSnip'

    -- Bufferline for tabs
    use { 'akinsho/nvim-bufferline.lua', requires = 'kyazdani42/nvim-web-devicons'}

    -- Remember last edit location in file
    use 'ethanholz/nvim-lastplace'

    -- Colorize hex color codes
    use 'norcalli/nvim-colorizer.lua'

    -- File manager
    use {
        'kyazdani42/nvim-tree.lua',
        requires = {
            'kyazdani42/nvim-web-devicons',
        },
        config = function() require'nvim-tree'.setup{} end
    }

    -- dhall syntax
    use 'vmchale/dhall-vim'

	-- lualine
	use {
		'nvim-lualine/lualine.nvim',
		requires = { 'kyazdan42/nvim-web-devicons', opt = true }
	}

	-- Embark color theme
    -- use 'embark-theme/vim'

    -- Editorconfig
    use 'editorconfig/editorconfig-vim'

    -- nvim-commenter
    use 'terrortylor/nvim-comment'

    -- sloum/gemini-vim-syntax
    use 'https://tildegit.org/sloum/gemini-vim-syntax'

    -- dracula-pro/vim
    -- use '~/.config/nvim/draculapro'

    -- catppuccin theme
    use {
        'catppuccin/nvim',
        as = 'catppuccin'
    }

    -- go.nvim
    use 'ray-x/go.nvim'

    -- fish syntax
    use 'khaveesh/vim-fish-syntax'

    -- Nim syntax
    use 'alaviss/nim.nvim'

end)

-- Local map function
local function map(mode, lhs, rhs, opts)
    local options = { noremap = true, silent = true }
    if opts then
        options = vim.tbl_extend("force", options, opts)
    end
    vim.api.nvim_set_keymap(mode, lhs, rhs, options)
end

local opt = {}

--Remap space as leader key
map('', '<Space>', '<Nop>', { noremap = true, silent = true })
vim.g.mapleader = ' '
vim.g.maplocalleader = ' '

--Incremental live completion
vim.o.inccommand = 'split'

--Set highlight on search
vim.o.hlsearch = true

--Make line numbers default
vim.wo.number = true

-- Relative line numbers
vim.wo.relativenumber = true

--Do not save when switching buffers
vim.o.hidden = true

--Enable mouse mode
vim.o.mouse = 'a'

--Enable break indent
vim.o.breakindent = true

--Save undo history
vim.cmd [[set undofile]]

--Case insensitive searching UNLESS /C or capital in search
vim.o.ignorecase = true
vim.o.smartcase = true

--Decrease update time
vim.o.updatetime = 250
vim.wo.signcolumn = 'yes'

--Set colorscheme (order is important here)
vim.o.termguicolors = true
vim.g.catppuccin_flavor = "mocha"
vim.cmd [[colorscheme catppuccin]]

--Highlight column 88
vim.cmd [[set colorcolumn=88]]

--Set splits
vim.o.splitbelow = true
vim.o.splitright = true

--Clipboard
vim.o.clipboard = "unnamedplus"

-- Press ESC to turn off search highlight
map("n", "<Esc>", ":noh<CR>", opt)

--Tabs and indents
vim.o.shiftwidth = 4
vim.o.smartindent = true
vim.o.softtabstop = 4
vim.o.tabstop = 4
vim.o.autoindent = true

-- Lualine
require('lualine').setup{
    options = {
        theme = "catppuccin"
    }
}

-- Sometimes I don't let go of the shift key in time
vim.cmd [[command! WQ wq]]
vim.cmd [[command! Wq wq]]
vim.cmd [[command! Wqa wqa]]
vim.cmd [[command! WQa wqa]]
vim.cmd [[command! W w]]
vim.cmd [[command! Q q]]

-- Sometimes I accidentally undo a change when trying to enter INSERT mode
map("n", "u", "<Nop>", opt)

-- Don't copy deleted text
map("n", "dd", [=[ "_dd ]=], opt)
map("v", "dd", [=[ "_dd ]=], opt)
map("v", "x", [=[ "_x ]=], opt)

-- Copy whole file content
map("n", "<C-a>", [[ <Cmd> %y+<CR>]], opt)

-- Commenter keybinding
require('nvim_comment').setup()
map("n", "<leader>/", ":CommentToggle<CR>", opt)
map("v", "<leader>/", ":CommentToggle<CR>", opt)

--Remap for dealing with word wrap
map('n', 'k', "v:count == 0 ? 'gk' : 'k'", { noremap = true, expr = true, silent = true })
map('n', 'j', "v:count == 0 ? 'gj' : 'j'", { noremap = true, expr = true, silent = true })

--Map blankline
vim.g.indent_blankline_char = '┊'
vim.g.indent_blankline_filetype_exclude = { 'help', 'packer' }
vim.g.indent_blankline_buftype_exclude = { 'terminal', 'nofile' }
vim.g.indent_blankline_char_highlight = 'LineNr'
vim.g.indent_blankline_show_trailing_blankline_indent = false

-- Ansible-flavorited YAML
vim.g.ansible_unindent_after_newline = true

-- nvim-lastplace
require'nvim-lastplace'.setup{}

-- nvim-bufferline.lua
require("bufferline").setup{
    options = {
        separator_style = "slant"
    }
}

map("n", "<S-t>", ":enew<CR>", opt) -- new buffer
map("n", "<C-t>b", ":tabnew<CR>", opt) -- new tab
map("n", "<S-x>", ":bd!<CR>", opt) -- close tab
map("n", "<TAB>", ":BufferLineCycleNext<CR>", opt)
map("n", "<S-TAB>", ":BufferLineCyclePrev<CR>", opt)

-- Gitsigns
require('gitsigns').setup {
    signs = {
        add = { hl = 'GitGutterAdd', text = '+' },
        change = { hl = 'GitGutterChange', text = '~' },
        delete = { hl = 'GitGutterDelete', text = '_' },
        topdelete = { hl = 'GitGutterDelete', text = '‾' },
        changedelete = { hl = 'GitGutterChange', text = '~' },
    },
}

-- Telescope
require('telescope').setup {
    defaults = {
        mappings = {
            i = {
                ['<C-u>'] = false,
                ['<C-d>'] = false,
            },
        },
    },
}
--Add leader shortcuts
map('n', '<leader><space>', [[<cmd>lua require('telescope.builtin').buffers()<CR>]], { noremap = true, silent = true })
map('n', '<leader>sf', [[<cmd>lua require('telescope.builtin').find_files({previewer = false})<CR>]], { noremap = true, silent = true })
map('n', '<leader>sb', [[<cmd>lua require('telescope.builtin').current_buffer_fuzzy_find()<CR>]], { noremap = true, silent = true })
map('n', '<leader>sh', [[<cmd>lua require('telescope.builtin').help_tags()<CR>]], { noremap = true, silent = true })
map('n', '<leader>st', [[<cmd>lua require('telescope.builtin').tags()<CR>]], { noremap = true, silent = true })
map('n', '<leader>sd', [[<cmd>lua require('telescope.builtin').grep_string()<CR>]], { noremap = true, silent = true })
map('n', '<leader>sp', [[<cmd>lua require('telescope.builtin').live_grep()<CR>]], { noremap = true, silent = true })
map('n', '<leader>so', [[<cmd>lua require('telescope.builtin').tags{ only_current_buffer = true }<CR>]], { noremap = true, silent = true })
map('n', '<leader>?', [[<cmd>lua require('telescope.builtin').oldfiles()<CR>]], { noremap = true, silent = true })

-- Highlight on yank
vim.api.nvim_exec(
[[
augroup YankHighlight
autocmd!
autocmd TextYankPost * silent! lua vim.highlight.on_yank()
augroup end
]],
false
)

-- Y yank until the end of line
map('n', 'Y', 'y$', { noremap = true })

-- Nvim Tree
map('n', '<C-n>', ':NvimTreeToggle<CR>', opt)
map('n', '<leader>r', ':NvimTreeRefresh<CR>', opt)
map('n', '<leader>n', ':NvimTreeFindFile<CR>', opt)

-- go.nvim settings
vim.api.nvim_exec(
[[
autocmd BufWritePre *.go :silent! lua require('go.format').goimport()
]],
false
)
require('go').setup()

-- LSP settings
local nvim_lsp = require 'lspconfig'
local on_attach = function(_, bufnr)
    vim.api.nvim_buf_set_option(bufnr, 'omnifunc', 'v:lua.vim.lsp.omnifunc')

    local opts = { noremap = true, silent = true }
    vim.api.nvim_buf_set_keymap(bufnr, 'n', 'gD', '<Cmd>lua vim.lsp.buf.declaration()<CR>', opts)
    vim.api.nvim_buf_set_keymap(bufnr, 'n', 'gd', '<Cmd>lua vim.lsp.buf.definition()<CR>', opts)
    vim.api.nvim_buf_set_keymap(bufnr, 'n', 'K', '<Cmd>lua vim.lsp.buf.hover()<CR>', opts)
    vim.api.nvim_buf_set_keymap(bufnr, 'n', 'gi', '<cmd>lua vim.lsp.buf.implementation()<CR>', opts)
    vim.api.nvim_buf_set_keymap(bufnr, 'n', '<C-k>', '<cmd>lua vim.lsp.buf.signature_help()<CR>', opts)
    vim.api.nvim_buf_set_keymap(bufnr, 'n', '<leader>wa', '<cmd>lua vim.lsp.buf.add_workspace_folder()<CR>', opts)
    vim.api.nvim_buf_set_keymap(bufnr, 'n', '<leader>wr', '<cmd>lua vim.lsp.buf.remove_workspace_folder()<CR>', opts)
    vim.api.nvim_buf_set_keymap(bufnr, 'n', '<leader>wl', '<cmd>lua print(vim.inspect(vim.lsp.buf.list_workspace_folders()))<CR>', opts)
    vim.api.nvim_buf_set_keymap(bufnr, 'n', '<leader>D', '<cmd>lua vim.lsp.buf.type_definition()<CR>', opts)
    vim.api.nvim_buf_set_keymap(bufnr, 'n', '<leader>rn', '<cmd>lua vim.lsp.buf.rename()<CR>', opts)
    vim.api.nvim_buf_set_keymap(bufnr, 'n', 'gr', '<cmd>lua vim.lsp.buf.references()<CR>', opts)
    vim.api.nvim_buf_set_keymap(bufnr, 'n', '<leader>ca', '<cmd>lua vim.lsp.buf.code_action()<CR>', opts)
    -- vim.api.nvim_buf_set_keymap(bufnr, 'v', '<leader>ca', '<cmd>lua vim.lsp.buf.range_code_action()<CR>', opts)
    vim.api.nvim_buf_set_keymap(bufnr, 'n', '<leader>e', '<cmd>lua vim.lsp.diagnostic.show_line_diagnostics()<CR>', opts)
    vim.api.nvim_buf_set_keymap(bufnr, 'n', '[d', '<cmd>lua vim.lsp.diagnostic.goto_prev()<CR>', opts)
    vim.api.nvim_buf_set_keymap(bufnr, 'n', ']d', '<cmd>lua vim.lsp.diagnostic.goto_next()<CR>', opts)
    vim.api.nvim_buf_set_keymap(bufnr, 'n', '<leader>q', '<cmd>lua vim.lsp.diagnostic.set_loclist()<CR>', opts)
    vim.api.nvim_buf_set_keymap(bufnr, 'n', '<leader>so', [[<cmd>lua require('telescope.builtin').lsp_document_symbols()<CR>]], opts)
    vim.cmd [[ command! Format execute 'lua vim.lsp.buf.formatting()' ]]
end

local capabilities = vim.lsp.protocol.make_client_capabilities()
capabilities.textDocument.completion.completionItem.snippetSupport = true

-- Enable the following language servers
local servers = { 'bashls', 'dockerls', 'gopls', 'pyright', 'yamlls' }
for _, lsp in ipairs(servers) do
    nvim_lsp[lsp].setup {
        on_attach = on_attach,
        capabilities = capabilities,
    }
end

-- Sumneko Lua Language Server
local sumneko_root_path
local sumneko_binary
sumneko_root_path = vim.fn.getenv("HOME").."/.local/share/lua-language-server"
sumneko_binary = sumneko_root_path .. "/bin/lua-language-server"

-- Make runtime files discoverable to the server
local runtime_path = vim.split(package.path, ';')
table.insert(runtime_path, 'lua/?.lua')
table.insert(runtime_path, 'lua/?/init.lua')

require('lspconfig').sumneko_lua.setup {
    cmd = { sumneko_binary, '-E', sumneko_root_path .. '/main.lua' },
    on_attach = on_attach,
    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',
                -- Setup your lua path
                path = runtime_path,
            },
            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),
                preloadFileSize = 1000,
            },
            -- Do not send telemetry data containing a randomized but unique identifier
            telemetry = {
                enable = false,
            },
        },
    },
}

-- Bash LSP
require('lspconfig').bashls.setup{}

-- Docker LSP
require('lspconfig').dockerls.setup{}

-- JSON LSP
require('lspconfig').jsonls.setup{}

-- Nim LSP
require('lspconfig').nimls.setup{}

-- Pyright (Python) LSP
require('lspconfig').pyright.setup{}

-- Treesitter configuration
-- Parsers must be installed manually via :TSInstall
require('nvim-treesitter.configs').setup {
    highlight = {
        enable = true, -- false will disable the whole extension
    },
    incremental_selection = {
        enable = true,
        keymaps = {
            init_selection = 'gnn',
            node_incremental = 'grn',
            scope_incremental = 'grc',
            node_decremental = 'grm',
        },
    },
    indent = {
        enable = true,
    },
    textobjects = {
        select = {
            enable = true,
            lookahead = true, -- Automatically jump forward to textobj, similar to targets.vim
            keymaps = {
                -- You can use the capture groups defined in textobjects.scm
                ['af'] = '@function.outer',
                ['if'] = '@function.inner',
                ['ac'] = '@class.outer',
                ['ic'] = '@class.inner',
            },
        },
        move = {
            enable = true,
            set_jumps = true, -- whether to set jumps in the jumplist
            goto_next_start = {
                [']m'] = '@function.outer',
                [']]'] = '@class.outer',
            },
            goto_next_end = {
                [']M'] = '@function.outer',
                [']['] = '@class.outer',
            },
            goto_previous_start = {
                ['[m'] = '@function.outer',
                ['[['] = '@class.outer',
            },
            goto_previous_end = {
                ['[M'] = '@function.outer',
                ['[]'] = '@class.outer',
            },
        },
    },
}

-- Set completeopt to have a better completion experience
vim.o.completeopt = 'menuone,noinsert'

-- Compe setup
require('compe').setup {
    source = {
        path = true,
        nvim_lsp = true,
        luasnip = true,
        buffer = false,
        calc = false,
        nvim_lua = false,
        vsnip = false,
        ultisnips = false,
    },
}

-- Utility functions for compe and luasnip
local t = function(str)
    return vim.api.nvim_replace_termcodes(str, true, true, true)
end

local check_back_space = function()
    local col = vim.fn.col '.' - 1
    if col == 0 or vim.fn.getline('.'):sub(col, col):match '%s' then
        return true
    else
        return false
    end
end

-- Use (s-)tab to:
--- move to prev/next item in completion menuone
--- jump to prev/next snippet's placeholder
local luasnip = require 'luasnip'

_G.tab_complete = function()
    if vim.fn.pumvisible() == 1 then
        return t '<C-n>'
    elseif luasnip.expand_or_jumpable() then
        return t '<Plug>luasnip-expand-or-jump'
    elseif check_back_space() then
        return t '<Tab>'
    else
        return vim.fn['compe#complete']()
    end
end

_G.s_tab_complete = function()
    if vim.fn.pumvisible() == 1 then
        return t '<C-p>'
    elseif luasnip.jumpable(-1) then
        return t '<Plug>luasnip-jump-prev'
    else
        return t '<S-Tab>'
    end
end

-- Map tab to the above tab complete functiones
map('i', '<Tab>', 'v:lua.tab_complete()', { expr = true })
map('s', '<Tab>', 'v:lua.tab_complete()', { expr = true })
map('i', '<S-Tab>', 'v:lua.s_tab_complete()', { expr = true })
map('s', '<S-Tab>', 'v:lua.s_tab_complete()', { expr = true })

-- Map compe confirm and complete functions
map('i', '<cr>', 'compe#confirm("<cr>")', { expr = true })
map('i', '<c-space>', 'compe#complete()', { expr = true })