local Menu               = require("nui.menu")
local NuiTree            = require("nui.tree")
local job                = require("gitlab.job")
local state              = require("gitlab.state")
local u                  = require("gitlab.utils")
local keymaps            = require("gitlab.keymaps")
local Popup              = require("nui.popup")
local M                  = {}

local commentPopup       = Popup(u.create_popup_state("Comment", "40%", "60%"))
local editPopup          = Popup(u.create_popup_state("Edit Comment", "80%", "80%"))

M.line_status            = nil

M.create_comment         = function()
  if u.base_invalid() then return end
  commentPopup:mount()
  keymaps.set_popup_keymaps(commentPopup, M.confirm_create_comment)
end

M.find_deletion_commit   = function(file)
  local current_line = vim.api.nvim_get_current_line()
  local command = string.format("git log -S '%s' %s", current_line, file)
  local handle = io.popen(command)
  local output = handle:read("*line")
  if output == nil then
    vim.notify("Error reading SHA of deletion commit", vim.log.levels.ERROR)
    return ""
  end
  handle:close()
  local words = {}
  for word in output:gmatch("%S+") do
    table.insert(words, word)
  end

  return words[2]
end

-- Sends the comment to Gitlab
M.confirm_create_comment = function(text)
  if u.base_invalid() then return end
  local relative_file_path = u.get_relative_file_path()
  local current_line_number = u.get_current_line_number()
  if relative_file_path == nil then return end

  -- If leaving a comment on a deleted line, get hash value + proper filename
  local sha = ""
  local is_base_file = relative_file_path:find(".git")
  if is_base_file then -- We are looking at a deletion.
    local _, path = u.split_diff_view_filename(relative_file_path)
    relative_file_path = path
    sha = M.find_deletion_commit(path)
    if sha == "" then
      return
    end
  end

  local json = string.format('{ "line_number": %d, "file_name": "%s", "comment": "%s" }', current_line_number,
    relative_file_path, text)
  job.run_job("comment", "POST", json)
end

M.delete_comment         = function()
  local menu = Menu({
    position = "50%",
    size = {
      width = 25,
    },
    border = {
      style = "single",
      text = {
        top = "Delete Comment?",
        top_align = "center",
      },
    },
    win_options = {
      winhighlight = "Normal:Normal,FloatBorder:Normal",
    },
  }, {
    lines = {
      Menu.item("Confirm"),
      Menu.item("Cancel"),
    },
    max_width = 20,
    keymap = {
      focus_next = state.keymaps.dialogue.focus_next,
      focus_prev = state.keymaps.dialogue.focus_prev,
      close = state.keymaps.dialogue.close,
      submit = state.keymaps.dialogue.submit,
    },
    on_submit = function(item)
      if item.text == "Confirm" then
        local note_id
        local node = state.tree:get_node()
        if node.is_note then
          note_id = node:get_id()
        end
        local parentId = node:get_parent_id()
        while (parentId ~= nil) do
          node = state.tree:get_node(parentId)
          parentId = node:get_parent_id()
          if node.is_note then
            note_id = node:get_id()
          end
        end
        local discussion_id = node:get_id()
        discussion_id = string.sub(discussion_id, 2) -- Remove the "-" at the start
        note_id = string.sub(note_id, 2)             -- Remove the "-" at the start


        local json = string.format('{"discussion_id": "%s", "note_id": %d}', discussion_id, note_id)
        job.run_job("comment", "DELETE", json, function(data)
          vim.notify(data.message, vim.log.levels.INFO)
          state.tree:remove_node("-" .. note_id)
          local discussion_node = state.tree:get_node("-" .. discussion_id)
          if not discussion_node:has_children() then
            state.tree:remove_node("-" .. discussion_id)
          end
          state.tree:render()
        end)
      end
    end,
  })
  menu:mount()
end


M.edit_comment = function()
  if u.base_invalid() then return end
  local node = state.tree:get_node()
  if node.is_discussion then return end
  if node.is_body then
    local parentId = node:get_parent_id()
    node = state.tree:get_node(parentId) -- Get the node for the comment
  end

  editPopup:mount()

  local note_id = string.sub(node:get_id(), 2) -- Remove the "-" at the start
  local discussion_id = node:get_parent_id()
  discussion_id = string.sub(discussion_id, 2) -- Remove the "-" at the start

  state.ACTIVE_DISCUSSION = discussion_id
  state.ACTIVE_NOTE = note_id

  local lines = {}
  local childrenIds = node:get_child_ids()
  for _, value in ipairs(childrenIds) do
    local line = state.tree:get_node(value).text
    table.insert(lines, line)
  end

  local currentBuffer = vim.api.nvim_get_current_buf()
  vim.api.nvim_buf_set_lines(currentBuffer, 0, -1, false, lines)
  keymaps.set_popup_keymaps(editPopup, M.send_edits)
end

M.send_edits   = function(text)
  local escapedText = string.gsub(text, "\n", "\\n")
  local json = string.format('{"discussion_id": "%s", "note_id": %s, "comment": "%s"}', state.ACTIVE_DISCUSSION,
    state.ACTIVE_NOTE, escapedText)

  job.run_job("comment", "PATCH", json, function()
    vim.schedule(function()
      local node = state.tree:get_node("-" .. state.ACTIVE_NOTE)
      local childrenIds = node:get_child_ids()
      for _, value in ipairs(childrenIds) do
        state.tree:remove_node(value)
      end

      local newNoteTextNodes = {}
      for bodyLine in text:gmatch("[^\n]+") do
        table.insert(newNoteTextNodes, NuiTree.Node({ text = bodyLine, is_body = true }, {}))
      end

      state.tree:set_nodes(newNoteTextNodes, "-" .. state.ACTIVE_NOTE)

      state.tree:render()
      local buf = vim.api.nvim_get_current_buf()
      u.darken_metadata(buf, '')
      vim.notify("Edited comment!", vim.log.levels.INFO)
    end)
  end)
end

return M