-- lua/plugins/extras/diffview.lua
-- Side-by-side diff view for staged/unstaged changes across all files
-- https://github.com/sindrets/diffview.nvim
--
-- Keymaps:
--   <leader>ds  — staged changes   (git diff --cached)
--   <leader>du  — unstaged changes (git diff)
--   <leader>dh  — diff against HEAD
--   <leader>dq  — close diffview
--
-- Inside diffview:
--   <Tab> / <S-Tab>  — next/prev changed file
--   [c / ]c          — prev/next hunk in file
--   s                — stage/unstage file (in file panel)
--   q / <leader>dq   — close

return {
  'sindrets/diffview.nvim',
  lazy = true,
  dependencies = { 'nvim-tree/nvim-web-devicons' },
  cmd = { 'DiffviewOpen', 'DiffviewClose', 'DiffviewFileHistory' },
  keys = {
    { '<leader>ds', '<cmd>DiffviewOpen --staged<cr>', desc = 'git [d]iff [s]taged' },
    { '<leader>du', '<cmd>DiffviewOpen<cr>', desc = 'git [d]iff [u]nstaged' },
    { '<leader>dh', '<cmd>DiffviewOpen HEAD<cr>', desc = 'git [d]iff [h]ead' },
    { '<leader>dq', '<cmd>DiffviewClose<cr>', desc = 'git [d]iff [q]uit' },
  },
  opts = {
    enhanced_diff_hl = true,
    view = {
      default = {
        layout = 'diff2_horizontal', -- side by side
        winbar_info = true,
      },
      merge_tool = {
        layout = 'diff3_horizontal',
        disable_diagnostics = true,
      },
    },
    file_panel = {
      listing_style = 'tree',
      win_config = { width = 35 },
    },
    hooks = {
      -- close diffview with q in any diffview buffer
      view_opened = function()
        vim.keymap.set('n', 'q', '<cmd>DiffviewClose<cr>', { buffer = true, silent = true })
      end,
    },
  },
}