-- jj-mini.diff Neovim plugin

local M = {}

-- Helper function to run jj commands
local function _run_jj_command(args)
  local cmd = "jj " .. table.concat(args, " ")
  local handle = io.popen(cmd)
  if not handle then
    return nil, "Failed to run command: " .. cmd
  end
  local output = handle:read("*a")
  local status = handle:close()
  if not status then
    return nil, "Command failed: " .. cmd
  end
  return output
end

-- Define Neovim signs for diff
local function _define_signs()
  vim.fn.sign_define("JjDiffAdd", { text = "│", texthl = "JjDiffAdd", numhl = "JjDiffAdd" })
  vim.fn.sign_define("JjDiffChange", { text = "│", texthl = "JjDiffChange", numhl = "JjDiffChange" })
  vim.fn.sign_define("JjDiffDelete", { text = "─", texthl = "JjDiffDelete", numhl = "JjDiffDelete" })
end

-- Get jj diff output for the current buffer
local function _get_jj_diff_for_buffer()
  local file_path = vim.api.nvim_buf_get_name(0)
  if file_path == "" then
    return nil, "Current buffer is not associated with a file."
  end

  -- Run 'jj diff' for the specific file
  local diff_output, err = _run_jj_command({ "diff", "--color=never", file_path })
  if err then
    return nil, err
  end
  return diff_output
end

function M.setup(opts)
  opts = opts or {}
  _define_signs() -- Call to define signs
  -- TODO: Implement configuration options
end

-- TODO: Implement core logic for Git signs

return M