-- Copilot Chat (UI + prompts for Copilot)
return {
  'CopilotC-Nvim/CopilotChat.nvim',
  cmd = {
    'CopilotChat',
    'CopilotChatClose',
    'CopilotChatExplain',
    'CopilotChatReview',
    'CopilotChatTests',
    'CopilotChatRefactor',
    'CopilotChatOptimize',
    'CopilotChatDocs',
    'CopilotChatToggle',
  },
  keys = {
    { '<leader>C', '<cmd>CopilotChat<cr>', desc = 'Open CopilotChat' },
    { '<leader>Cq', '<cmd>CopilotChatClose<cr>', desc = 'Close CopilotChat' },
    { '<leader>Ce', '<cmd>CopilotChatExplain<cr>', desc = 'Explain code', mode = { 'n', 'v' } },
    { '<leader>Cr', '<cmd>CopilotChatReview<cr>', desc = 'Review code', mode = { 'n', 'v' } },
    { '<leader>Ct', '<cmd>CopilotChatTests<cr>', desc = 'Generate tests', mode = { 'n', 'v' } },
    { '<leader>Cf', '<cmd>CopilotChatRefactor<cr>', desc = 'Refactor code', mode = { 'n', 'v' } },
    { '<leader>Co', '<cmd>CopilotChatOptimize<cr>', desc = 'Optimize code', mode = { 'n', 'v' } },
    { '<leader>Cd', '<cmd>CopilotChatDocs<cr>', desc = 'Generate docs', mode = { 'n', 'v' } },
    { '<leader>Cp', '<cmd>CopilotChatToggle<cr>', desc = 'Toggle CopilotChat' },
  },
  build = 'make tiktoken',
  opts = {
    debug = false,
    show_help = true,
    prompts = {
      Explain = 'Please explain how the following code works.',
      Review = 'Please review the following code and provide suggestions for improvement.',
      Tests = 'Please explain how the selected code works, then generate unit tests for it.',
      Refactor = 'Please refactor the following code to improve its clarity and readability.',
      Optimize = 'Please optimize the following code for efficiency and performance.',
      Docs = 'Please generate documentation for the following code.',
    },
  },
  dependencies = {
    'nvim-lua/plenary.nvim',
    'zbirenbaum/copilot.lua', -- make sure copilot is available
  },
}