-- This module is responsible for the assignment of reviewers
-- and assignees in Gitlab, those who must review an MR.
local u = require("gitlab.utils")
local job = require("gitlab.job")
local List = require("gitlab.utils.list")
local state = require("gitlab.state")
local M = {}

M.add_assignee = function()
  M.add_popup("assignee")
end

M.delete_assignee = function()
  M.delete_popup("assignee")
end

M.add_reviewer = function()
  M.add_popup("reviewer")
end

M.delete_reviewer = function()
  M.delete_popup("reviewer")
end

M.add_popup = function(type)
  local plural = type .. "s"
  local current = state.INFO[plural]
  local eligible = M.filter_eligible(state.PROJECT_MEMBERS, current)
  vim.ui.select(eligible, {
    prompt = "Choose " .. type .. " to add",
    format_item = function(user)
      return user.username .. " (" .. user.name .. ")"
    end,
  }, function(choice)
    if not choice then
      return
    end
    local current_ids = u.extract(current, "id")
    table.insert(current_ids, choice.id)
    local body = { ids = current_ids }
    job.run_job("/mr/" .. type, "PUT", body, function(data)
      u.notify(data.message, vim.log.levels.INFO)
      state.INFO[plural] = data[plural]
    end)
  end)
end

M.delete_popup = function(type)
  local plural = type .. "s"
  local current = state.INFO[plural]
  vim.ui.select(current, {
    prompt = "Choose " .. type .. " to delete",
    format_item = function(user)
      return user.username .. " (" .. user.name .. ")"
    end,
  }, function(choice)
    if not choice then
      return
    end
    local ids = u.extract(M.filter_eligible(current, { choice }), "id")
    local body = { ids = ids }
    job.run_job("/mr/" .. type, "PUT", body, function(data)
      u.notify(data.message, vim.log.levels.INFO)
      state.INFO[plural] = data[plural]
    end)
  end)
end

M.filter_eligible = function(current, to_remove)
  local ids = u.extract(to_remove, "id")
  return List.new(current):filter(function(member)
    if not u.contains(ids, member.id) then
      return true
    end
  end)
end

return M