local Window = require("jjannotate.window")
local backend = require("jjannotate.backend")
local cache = require("jjannotate.cache")
local util = require("jjannotate.util")

--- Attach to an annotate buffer created/restored externally
---@param buf integer
local function attach(buf)
  if vim.b[buf].jjannotate then return end
  local ref = util.parse_uri("annotate", vim.api.nvim_buf_get_name(buf))
  if not ref or cache:get_by_revision(ref) then return end

  local b = backend.detect(ref.repo)
  if not b then return end

  ---@type jjannotate.Revision
  local revision = vim.tbl_extend("force", ref, { backend = b })

  vim.b[buf].jjannotate = true
  Window.open(revision, false)
end

local M = {}

local augroup = vim.api.nvim_create_augroup("jjannotate_attach", { clear = true })

function M.setup()
  vim.api.nvim_create_autocmd("BufReadCmd", {
    desc = "Load a jjannotate buffer",
    group = augroup,
    pattern = "jjannotate://annotate/*",
    callback = function(args) attach(args.buf) end,
  })
  vim.api.nvim_create_autocmd("BufFilePost", {
    desc = "Attach to a renamed jjannotate buffer",
    group = augroup,
    pattern = "jjannotate://*",
    callback = function(args) attach(args.buf) end,
  })
end

return M