local log = require "navigator.util".log
local function set_keymap(...)
  vim.api.nvim_set_keymap(...)
end

local event_hdlrs = {
  {ev = "BufWritePre", func = "diagnostic.set_loclist({open_loclist = false})"},
  {ev = "CursorHold", func = "document_highlight()"},
  {ev = "CursorHoldI", func = "document_highlight()"},
  {ev = "CursorMoved", func = "clear_references()"}
}

local key_maps = {
  {key = "gr", func = "references()"},
  {mode = "i", key = "<M-k>", func = "signature_help()"},
  {key = "gs", func = "signature_help()"},
  {key = "g0", func = "document_symbol()"},
  {key = "gW", func = "workspace_symbol()"},
  {key = "<c-]>", func = "definition()"},
  {key = "gD", func = "declaration()"},
  {key = "gp", func = "require('navigator.definition').definition_preview()"},
  {key = "gT", func = "require('navigator.treesitter').buf_ts()"},
  {key = "GT", func = "require('navigator.treesitter').bufs_ts()"},

  {key = "K", func = "hover()"},
  {key = "ga", mode = 'n', func = "code_action()"},
  {key = "ga", mode = 'v', func = "range_code_action()"},

  {key = "<Leader>re", func = "rename()"},
  {key = "<Leader>gi", func = "incoming_calls()"},
  {key = "<Leader>go", func = "outgoing_calls()"},
  {key = "gi", func = "implementation()"},
  {key = "gt", func = "type_definition()"},
  {key = "gL", func = "diagnostic.show_line_diagnostics()"},
  {key = "gG", func = "require('navigator.diagnostics').show_diagnostic()"},
  {key = "]d", func = "diagnostic.goto_next()"},
  {key = "[d", func = "diagnostic.goto_prev()"},

  {key = "<C-LeftMouse>", func = "definition()"},
  {key = "g<LeftMouse>", func = "implementation()"}
}

local function set_mapping(user_opts)
  local opts = {noremap = true, silent = true}
  user_opts = user_opts or {}

  local user_key = user_opts.keymaps or {}
  local bufnr = user_opts.bufnr or 0

  local function buf_set_keymap(...)
    vim.api.nvim_buf_set_keymap(bufnr, ...)
  end

  -- local function buf_set_option(...)
  --   vim.api.nvim_buf_set_option(bufnr, ...)
  -- end
  for _, v in pairs(user_key) do
    local exists = false
    for _, default in pairs(key_maps) do
      if v.func == default.func then
        default.key, exists = v.key, true
        break
      end
    end
    if not exists then
      table.insert(key_maps, v)
    end
  end

  -- local key_opts = {vim.tbl_deep_extend("force", key_maps, unpack(result))}
  for _, value in pairs(key_maps) do
    local f = "<Cmd>lua vim.lsp.buf." .. value.func .. "<CR>"
    if string.find(value.func, 'require') then
      f = "<Cmd>lua " .. value.func .. "<CR>"
    elseif string.find(value.func, 'diagnostic') then
      f = "<Cmd>lua vim.lsp." .. value.func .. "<CR>"
    end
    local k = value.key
    local m = value.mode or "n"
    buf_set_keymap(m, k, f, opts)
  end

  -- format setup

  if user_opts.cap.document_formatting then
    buf_set_keymap("n", "<space>f", "<cmd>lua vim.lsp.buf.formatting()<CR>", opts)
    vim.cmd([[autocmd BufWritePre <buffer> lua vim.lsp.buf.formatting()]])
  end
  if user_opts.cap.document_range_formatting then
    buf_set_keymap("v", "<space>f", "<cmd>lua vim.lsp.buf.range_formatting()<CR>", opts)
  end
end

local function set_event_handler(user_opts)
  user_opts = user_opts or {}
  local file_types = "c,cpp,h,go,python,vim,sh,javascript,html,css,lua,typescript,rust"
  -- local format_files = "c,cpp,h,go,python,vim,javascript,typescript" --html,css,
  vim.api.nvim_command [[augroup nvim_lsp_autos]]
  vim.api.nvim_command [[autocmd!]]

  for _, value in pairs(event_hdlrs) do
    local f = ""
    if string.find(value.func, "diagnostic") then
      f = "lua vim.lsp." .. value.func
    else
      f = "lua vim.lsp.buf." .. value.func
    end
    local cmd = "autocmd FileType " .. file_types .. " autocmd nvim_lsp_autos " .. value.ev .. " <buffer> silent! " .. f
    vim.api.nvim_command(cmd)
  end
  vim.api.nvim_command([[augroup END]])
end

local M = {}

function M.setup(user_opts)
  set_mapping(user_opts)
  set_event_handler(user_opts)
  local cap = user_opts.cap or {}
  if cap.call_hierarchy then
    vim.lsp.handlers["callHierarchy/incomingCalls"] = require "navigator.hierarchy".incoming_calls_handler
    vim.lsp.handlers["callHierarchy/outgoingCalls"] = require "navigator.hierarchy".outgoing_calls_handler
  end

  vim.lsp.handlers["textDocument/references"] = require "navigator.reference".reference_handler
  vim.lsp.handlers["textDocument/codeAction"] = require "navigator.codeAction".code_action_handler
  vim.lsp.handlers["textDocument/definition"] = require "navigator.definition".definition_handler

  if cap.declaration then
    vim.lsp.handlers["textDocument/declaration"] = require "navigator.definition".declaration_handler
  end

  vim.lsp.handlers["textDocument/typeDefinition"] = require "navigator.definition".typeDefinition_handler
  vim.lsp.handlers["textDocument/implementation"] = require "navigator.implementation".implementation_handler

  vim.lsp.handlers["textDocument/documentSymbol"] = require "navigator.symbols".document_symbol_handler
  vim.lsp.handlers["workspace/symbol"] = require "navigator.symbols".workspace_symbol_handler
  vim.lsp.handlers["textDocument/publishDiagnostics"] = require'navigator.diagnostics'.diagnostic_handler
  vim.lsp.handlers["textDocument/publishDiagnostics"] = require'navigator.diagnostics'.diagnostic_handler

  local hassig, sig = pcall(require, "lsp_signature")
  if not hassig then
    vim.lsp.handlers["textDocument/signatureHelp"] = require'navigator.signature'.signature_handler
  end
  -- vim.lsp.handlers["textDocument/hover"]  = require 'navigator.hover'.hover_handler
end

return M