local gui = require('navigator.gui')
local util = require('navigator.util')
local log = util.log
local partial = util.partial
local lsphelper = require('navigator.lspwrapper')
local cwd = vim.loop.cwd()

local path_sep = require('navigator.util').path_sep()
local path_cur = require('navigator.util').path_cur()
local M = {}

local function call_hierarchy_handler(direction, err, result, ctx, cfg, error_message)
  log('call_hierarchy')
  log('call_hierarchy', direction, err, result, ctx, cfg)

  assert(next(vim.lsp.get_active_clients()), 'Must have a client running to use lsp_tags')
  if err ~= nil then
    log('hierarchy error', ctx, 'dir', direction, 'result', result, 'err', err)
    vim.notify('ERROR: ' .. error_message, vim.lsp.log_levels.WARN)
    return
  end
  -- log(funcs)
  local items = {}
  for _, call_hierarchy in pairs(result) do
    local kind = ' '
    local range = call_hierarchy.range
    local filename = assert(vim.uri_to_fname(call_hierarchy.uri))

    local display_filename = filename:gsub(cwd .. path_sep, path_cur, 1)

    local bufnr = vim.uri_to_bufnr(call_hierarchy.uri)
    local row = range.start.line
    local line = (vim.api.nvim_buf_get_lines(bufnr, row, row + 1, false) or { '' })[1]
    local fn = ''
    if line ~= nil then
      fn = line:sub(range.start.character, range['end'].character + 1)
    end
    table.insert(items, {
      uri = call_hierarchy.uri,
      filename = filename,
      display_filename = display_filename,
      text = kind .. fn,
      range = range,
      lnum = range.start.line + 1,
      col = range.start.character,
    })
  end
  return items
end

local call_hierarchy_handler_from = partial(call_hierarchy_handler, 'from')
local call_hierarchy_handler_to = partial(call_hierarchy_handler, 'to')

local function incoming_calls_handler(_, err, result, ctx, cfg)
  local bufnr = vim.api.nvim_get_current_buf()
  assert(next(vim.lsp.get_active_clients({buffer = bufnr})), 'Must have a client running to use lsp_tags' )

  local results = call_hierarchy_handler_from(err, result, ctx, cfg, 'Incoming calls not found')

  local ft = vim.api.nvim_buf_get_option(ctx.bufnr or 0, 'ft')
  gui.new_list_view({ items = results, ft = ft or 'cpp', api = ' ' })
end
--  err, method, result, client_id, bufnr
local function outgoing_calls_handler(_, err, result, ctx, cfg)
  local results = call_hierarchy_handler_to(err, result, ctx, cfg, 'Outgoing calls not found')

  local ft = vim.api.nvim_buf_get_option(ctx.bufnr or 0, 'ft')
  gui.new_list_view({ items = results, ft = ft or 'cpp', api = ' ' })
  -- fzf_locations(bang, "", "Outgoing Calls", results, false)
end

function M.incoming_calls(bang, opts)
  local bufnr = vim.api.nvim_get_current_buf()
  assert(next(vim.lsp.get_active_clients({buffer = bufnr})), 'Must have a client running to use lsp_tags' )
  -- if not lsphelper.check_capabilities("call_hierarchy") then
  --   return
  -- end

  local params = vim.lsp.util.make_position_params()
  -- params['hierarchy'] = true
  params['levels'] = 2
  params['callee'] = false
  -- params['callee'] = true
  log(params)
  log(opts)
  lsphelper.call_sync('$ccls/call', params, opts, partial(incoming_calls_handler, bang))
end

function M.outgoing_calls(bang, opts)
  local bufnr = vim.api.nvim_get_current_buf()
  assert(next(vim.lsp.get_active_clients({buffer = bufnr})), 'Must have a client running to use lsp_tags')
  local params = vim.lsp.util.make_position_params()
  params['levels'] = 2
  params['callee'] = true
  log(params)
  lsphelper.call_sync('$ccls/call', params, opts, partial(outgoing_calls_handler, bang))
end

M.incoming_calls_call = partial(M.incoming_calls, 0)
M.outgoing_calls_call = partial(M.outgoing_calls, 0)

M.incoming_calls_handler = partial(incoming_calls_handler, 0)
M.outgoing_calls_handler = partial(outgoing_calls_handler, 0)

return M