-- This module is responsible for CRUD operations for the draft notes in the discussion tree.
-- That includes things like editing existing draft notes in the tree, and
-- and deleting them. Normal notes and comments are managed separately,
-- under lua/gitlab/actions/discussions/init.lua
local winbar = require("gitlab.actions.discussions.winbar")
local diagnostics = require("gitlab.indicators.diagnostics")
local common = require("gitlab.actions.common")
local discussion_tree = require("gitlab.actions.discussions.tree")
local job = require("gitlab.job")
local NuiTree = require("nui.tree")
local List = require("gitlab.utils.list")
local u = require("gitlab.utils")
local state = require("gitlab.state")

local M = {}

---@class AddDraftNoteOpts table
---@field draft_note DraftNote
---@field unlinked boolean

---Adds a draft note to the draft notes state, then rebuilds the view
---@param opts AddDraftNoteOpts
M.add_draft_note = function(opts)
  local new_draft_notes = u.ensure_table(state.DRAFT_NOTES)
  table.insert(new_draft_notes, opts.draft_note)
  state.DRAFT_NOTES = new_draft_notes
  local discussions = require("gitlab.actions.discussions")
  if opts.unlinked then
    discussions.rebuild_unlinked_discussion_tree()
  else
    discussions.rebuild_discussion_tree()
  end
  winbar.update_winbar()
end

---Tells whether a draft note was left on a particular diff or is an unlinked note
---@param note DraftNote
M.has_position = function(note)
  return note.position.new_path ~= nil or note.position.old_path ~= nil
end

---Returns a list of nodes to add to the discussion tree. Can filter and return only unlinked (note) nodes.
---@param unlinked boolean
---@return NuiTree.Node[]
M.add_draft_notes_to_table = function(unlinked)
  local draft_notes = List.new(state.DRAFT_NOTES)

  local draft_note_nodes = draft_notes
    ---@param note DraftNote
    :filter(function(note)
      if unlinked then
        return not M.has_position(note)
      end
      return M.has_position(note)
    end)
    ---@param note DraftNote
    :map(function(note)
      local _, root_text, root_text_nodes = discussion_tree.build_note(note)
      return NuiTree.Node({
        range = (type(note.position) == "table" and note.position.line_range or nil),
        text = root_text,
        type = "note",
        is_root = true,
        is_draft = true,
        id = note.id,
        root_note_id = note.id,
        file_name = (type(note.position) == "table" and note.position.new_path or nil),
        new_line = (type(note.position) == "table" and note.position.new_line or nil),
        old_line = (type(note.position) == "table" and note.position.old_line or nil),
        resolvable = false,
        resolved = false,
        url = state.INFO.web_url .. "#note_" .. note.id,
      }, root_text_nodes)
    end)

  return draft_note_nodes

  -- TODO: Combine draft_notes and normal discussion nodes in the complex discussion
  -- tree. The code for that feature is a clusterfuck so this is difficult
  -- if state.settings.discussion_tree.tree_type == "simple" then
  --   return draft_note_nodes
  -- end
end

---Send edits will actually send the edits to Gitlab and refresh the draft_notes tree
M.send_edits = function(note_id)
  return function(text)
    local all_notes = List.new(state.DRAFT_NOTES)
    local the_note = all_notes:find(function(note)
      return note.id == note_id
    end)
    local body = { note = text, position = the_note.position }
    job.run_job(string.format("/mr/draft_notes/%d", note_id), "PATCH", body, function(data)
      u.notify(data.message, vim.log.levels.INFO)
      local has_position = false
      local new_draft_notes = all_notes:map(function(note)
        if note.id == note_id then
          has_position = M.has_position(note)
          note.note = text
        end
        return note
      end)
      state.DRAFT_NOTES = new_draft_notes
      local discussions = require("gitlab.actions.discussions")
      if has_position then
        discussions.rebuild_discussion_tree()
      else
        discussions.rebuild_unlinked_discussion_tree()
      end
      winbar.update_winbar()
    end)
  end
end

-- This function will actually send the deletion to Gitlab when you make a selection, and re-render the tree
M.send_deletion = function(tree)
  local current_node = tree:get_node()
  local note_node = common.get_note_node(tree, current_node)
  local root_node = common.get_root_node(tree, current_node)

  if note_node == nil or root_node == nil then
    u.notify("Could not get note or root node", vim.log.levels.ERROR)
    return
  end

  ---@type integer
  local note_id = note_node.is_root and root_node.id or note_node.id

  job.run_job(string.format("/mr/draft_notes/%d", note_id), "DELETE", nil, function(data)
    u.notify(data.message, vim.log.levels.INFO)

    local has_position = false
    local new_draft_notes = List.new(state.DRAFT_NOTES):filter(function(note)
      if note.id ~= note_id then
        return true
      else
        has_position = M.has_position(note)
        return false
      end
    end)

    state.DRAFT_NOTES = new_draft_notes
    local discussions = require("gitlab.actions.discussions")
    if has_position then
      discussions.rebuild_discussion_tree()
    else
      discussions.rebuild_unlinked_discussion_tree()
    end

    if state.settings.discussion_signs.enabled and state.DISCUSSION_DATA then
      diagnostics.refresh_diagnostics()
    end

    winbar.update_winbar()
    common.add_empty_titles()
  end)
end

-- This function will trigger a popup prompting you to publish the current draft comment
M.publish_draft = function(tree)
  vim.ui.select({ "Confirm", "Cancel" }, {
    prompt = "Publish current draft comment?",
  }, function(choice)
    if choice == "Confirm" then
      M.confirm_publish_draft(tree)
    end
  end)
end

-- This function will trigger a popup prompting you to publish all draft notes
M.publish_all_drafts = function()
  vim.ui.select({ "Confirm", "Cancel" }, {
    prompt = "Publish all drafts?",
  }, function(choice)
    if choice == "Confirm" then
      M.confirm_publish_all_drafts()
    end
  end)
end

---Publishes all draft notes and comments. Re-renders all discussion views.
M.confirm_publish_all_drafts = function()
  local body = { publish_all = true }
  job.run_job("/mr/draft_notes/publish", "POST", body, function(data)
    u.notify(data.message, vim.log.levels.INFO)
    state.DRAFT_NOTES = {}
    local discussions = require("gitlab.actions.discussions")
    discussions.refresh(function()
      discussions.rebuild_discussion_tree()
      discussions.rebuild_unlinked_discussion_tree()
      winbar.update_winbar()
    end)
  end)
end

---Publishes the current draft note that is being hovered over in the tree,
---and then makes an API call to refresh the relevant data for that tree
---and re-render it.
---@param tree NuiTree
M.confirm_publish_draft = function(tree)
  local current_node = tree:get_node()
  local note_node = common.get_note_node(tree, current_node)
  local root_node = common.get_root_node(tree, current_node)

  if note_node == nil or root_node == nil then
    u.notify("Could not get note or root node", vim.log.levels.ERROR)
    return
  end

  ---@type integer
  local note_id = note_node.is_root and root_node.id or note_node.id
  local body = { note = note_id, publish_all = false }
  job.run_job("/mr/draft_notes/publish", "POST", body, function(data)
    u.notify(data.message, vim.log.levels.INFO)

    local has_position = false
    local new_draft_notes = List.new(state.DRAFT_NOTES):filter(function(note)
      if note.id ~= note_id then
        return true
      else
        has_position = M.has_position(note)
        return false
      end
    end)

    state.DRAFT_NOTES = new_draft_notes
    local discussions = require("gitlab.actions.discussions")
    discussions.refresh(function()
      if has_position then
        discussions.rebuild_discussion_tree()
      else
        discussions.rebuild_unlinked_discussion_tree()
      end
      winbar.update_winbar()
    end)
  end)
end

return M