local u = require("gitlab.utils")
local state = require("gitlab.state")
local reviewer = require("gitlab.reviewer")
local List = require("gitlab.utils.list")

local M = {}

---Filter all discussions which are relevant for currently visible signs and diagnostics.
---@return Discussion[]
M.filter_placeable_discussions = function(all_discussions)
  if type(all_discussions) ~= "table" then
    return {}
  end
  local file = reviewer.get_current_file()
  if not file then
    return {}
  end
  return List.new(all_discussions):filter(function(discussion)
    local first_note = discussion.notes[1]
    return type(first_note.position) == "table"
      --Do not include unlinked notes
      and (first_note.position.new_path == file or first_note.position.old_path == file)
      --Skip resolved discussions if user wants to
      and not (state.settings.discussion_signs.skip_resolved_discussion and first_note.resolvable and first_note.resolved)
      --Skip discussions from old revisions
      and not (
        state.settings.discussion_signs.skip_old_revision_discussion
        and u.from_iso_format_date_to_timestamp(first_note.created_at)
          <= u.from_iso_format_date_to_timestamp(state.MR_REVISIONS[1].created_at)
      )
  end)
end

M.parse_line_code = function(line_code)
  local line_code_regex = "%w+_(%d+)_(%d+)"
  local old_line, new_line = line_code:match(line_code_regex)
  return tonumber(old_line), tonumber(new_line)
end

---@param discussion Discussion
---@return boolean
M.is_old_sha = function(discussion)
  local first_note = discussion.notes[1]
  return first_note.position.old_line ~= nil
end

---@param discussion Discussion
---@return boolean
M.is_new_sha = function(discussion)
  return not M.is_old_sha(discussion)
end

---@param discussion Discussion
---@return boolean
M.is_single_line = function(discussion)
  local first_note = discussion.notes[1]
  local line_range = first_note.position.line_range
  return line_range == nil
end

---@param discussion Discussion
---@return boolean
M.is_multi_line = function(discussion)
  return not M.is_single_line(discussion)
end

---@param discussion Discussion
---@return Note
M.get_first_note = function(discussion)
  return discussion.notes[1]
end

return M