local util = require('navigator.util')
local log = util.log
local trace = util.trace
local api = vim.api

if vim.lsp.buf.format == nil then
  vim.lsp.buf.format = vim.lsp.buf.formatting
end

if vim.diagnostic == nil then
  util.error('Please update nvim to 0.6.1+')
end
local double = { '╔', '═', '╗', '║', '╝', '═', '╚', '║' }
local single = { '╭', '─', '╮', '│', '╯', '─', '╰', '│' }
-- TODO https://github.com/neovim/neovim/pull/16591 use vimkeymap.set/del
-- LuaFormatter off
local key_maps = {
  { key = 'gr', func = require('navigator.reference').async_ref, desc = 'async_ref' },
  { key = '<Leader>gr', func = require('navigator.reference').reference, desc = 'reference' }, -- reference deprecated
  { mode = 'i', key = '<M-k>', func = vim.lsp.signature_help, desc = 'signature_help' },
  { key = '<c-k>', func = vim.lsp.buf.signature_help, desc = 'signature_help' },
  { key = 'g0', func = require('navigator.symbols').document_symbols, desc = 'document_symbols' },
  { key = 'gW', func = require('navigator.workspace').workspace_symbol_live, desc = 'workspace_symbol_live' },
  { key = '<c-]>', func = require('navigator.definition').definition, desc = 'definition' },
  { key = 'gd', func = require('navigator.definition').definition, desc = 'definition' },
  { key = 'gD', func = vim.lsp.buf.declaration, desc = 'declaration' },
  { key = 'gp', func = require('navigator.definition').definition_preview, desc = 'definition_preview' },
  { key = '<Leader>gt', func = require('navigator.treesitter').buf_ts, desc = 'buf_ts' },
  { key = '<Leader>gT', func = require('navigator.treesitter').bufs_ts, desc = 'bufs_ts' },
  { key = '<Leader>ct', func = require('navigator.ctags').ctags, desc = 'ctags' },
  { key = 'K', func = vim.lsp.buf.hover, desc = 'hover' },
  { key = '<Space>ca', mode = 'n', func = require('navigator.codeAction').code_action, desc = 'code_action' },
  {
    key = '<Space>ca',
    mode = 'v',
    func = require('navigator.codeAction').range_code_action,
    desc = 'range_code_action',
  },
  -- { key = '<Leader>re', func = 'rename()' },
  { key = '<Space>rn', func = require('navigator.rename').rename, desc = 'rename' },
  { key = '<Leader>gi', func = vim.lsp.buf.incoming_calls, desc = 'incoming_calls' },
  { key = '<Leader>go', func = vim.lsp.buf.outgoing_calls, desc = 'outgoing_calls' },
  { key = 'gi', func = vim.lsp.buf.implementation, desc = 'implementation' },
  { key = '<Space>D', func = vim.lsp.buf.type_definition, desc = 'type_definition' },
  { key = 'gL', func = require('navigator.diagnostics').show_diagnostics, desc = 'show_diagnostics' },
  { key = 'gG', func = require('navigator.diagnostics').show_buf_diagnostics, desc = 'show_buf_diagnostics' },
  { key = '<Leader>dt', func = require('navigator.diagnostics').toggle_diagnostics, desc = 'toggle_diagnostics' },
  { key = ']d', func = vim.diagnostic.goto_next, desc = 'next diagnostics' },
  { key = '[d', func = vim.diagnostic.goto_prev, desc = 'prev diagnostics' },
  { key = ']O', func = vim.diagnostic.set_loclist, desc = 'diagnostics set loclist' },
  { key = ']r', func = require('navigator.treesitter').goto_next_usage, desc = 'goto_next_usage' },
  { key = '[r', func = require('navigator.treesitter').goto_previous_usage, desc = 'goto_previous_usage' },
  { key = '<C-LeftMouse>', func = vim.lsp.buf.definition, desc = 'definition' },
  { key = 'g<LeftMouse>', func = vim.lsp.buf.implementation, desc = 'implementation' },
  { key = '<Leader>k', func = require('navigator.dochighlight').hi_symbol, desc = 'hi_symbol' },
  { key = '<Space>wa', func = require('navigator.workspace').add_workspace_folder, desc = 'add_workspace_folder' },
  {
    key = '<Space>wr',
    func = require('navigator.workspace').remove_workspace_folder,
    desc = 'remove_workspace_folder',
  },
  { key = '<Space>ff', func = vim.lsp.buf.format, mode = 'n', desc = 'format' },
  { key = '<Space>ff', func = vim.lsp.buf.range_formatting, mode = 'v', desc = 'range format' },
  {
    key = '<Space>gm',
    func = require('navigator.formatting').range_format,
    mode = 'n',
    desc = 'range format operator e.g gmip',
  },
  { key = '<Space>wl', func = require('navigator.workspace').list_workspace_folders, desc = 'list_workspace_folders' },
  { key = '<Space>la', mode = 'n', func = require('navigator.codelens').run_action, desc = 'run code lens action' },
}

local key_maps_help = {}
-- LuaFormatter on
local M = {}

local ccls_mappings = {
  { key = '<Leader>gi', func = require('navigator.cclshierarchy').incoming_calls, desc = 'incoming_calls' },
  { key = '<Leader>go', func = require('navigator.cclshierarchy').outgoing_calls, desc = 'outgoing_calls' },
}

local check_cap = function(opts)
  -- log(vim.lsp.buf_get_clients(0))
  local fmt, rfmt, ccls
  local cap = opts.cap
  if cap == nil then
    if opts.client and opts.client.server_capabilities then
      cap = opts.client.server_capabilities
    end
  end
  if cap and cap.documentFormattingProvider then
    fmt = true
  end
  if cap and cap.documentRangeFormattingProvider then
    rfmt = true
  end
  for _, value in pairs(vim.lsp.buf_get_clients(0)) do
    trace(value)
    if value ~= nil and value.server_capabilities == nil then
      if value.server_capabilities.documentFormattingProvider then
        fmt = true
      end
      if value.server_capabilities.documentRangeFormattingProvider then
        rfmt = true
      end

      log('override ccls', value.config)
      if value.config.name == 'ccls' then
        ccls = true
      end
    end
  end
  return fmt, rfmt, ccls
end

local function set_cmds(_)
  local commands = {
    [[command!  -nargs=* Nctags lua require("navigator.ctags").ctags(<f-args>)]],
    "command! -nargs=0 LspLog lua require'navigator.lspclient.config'.open_lsp_log()",
    "command! -nargs=0 LspRestart lua require'navigator.lspclient.config'.reload_lsp()",
    "command! -nargs=0 LspToggleFmt lua require'navigator.lspclient.mapping'.toggle_lspformat()<CR>",
    "command! -nargs=0 LspKeymaps lua require'navigator.lspclient.mapping'.get_keymaps_help()<CR>",
    "command! -nargs=0 LspSymbols lua require'navigator.symbols'.side_panel()<CR>",
    "command! -nargs=0 TSymbols lua require'navigator.treesitter'.side_panel()<CR>",
    "command! -nargs=0 NRefPanel lua require'navigator.reference'.side_panel()<CR>",
    "command! -nargs=* Calltree lua require'navigator.hierarchy'.calltree(<f-args>)<CR>",
  }

  for _, value in pairs(commands) do
    vim.cmd(value)
  end
end

-- should works for both 1)attach from known lsp client or from a disabled lsp client
-- executed in on_attach context
local function set_mapping(lsp_attach_info)
  local opts = { noremap = true, silent = true }
  vim.validate({
    lsp_attach_info = { lsp_attach_info, 'table' },
  })
  if _NgConfigValues.debug then
    log('setup mapping for client', lsp_attach_info.client.name, lsp_attach_info.client.cmd)
  end
  local user_key = _NgConfigValues.keymaps or {}
  local bufnr = lsp_attach_info.bufnr or 0

  local function del_keymap(mode, key, ...)
    local ks = vim.api.nvim_buf_get_keymap(bufnr, mode)
    if vim.tbl_contains(ks, key) then
      vim.api.nvim_buf_del_keymap(bufnr, mode, key, ...)
    end
  end

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

  -- local function buf_set_option(...)
  --   vim.api.nvim_buf_set_option(bufnr, ...)
  -- end
  local doc_fmt, range_fmt, ccls = check_cap(lsp_attach_info)

  if ccls then
    vim.list_extend(key_maps, ccls_mappings)
  end

  if _NgConfigValues.default_mapping ~= false then
    for _, v in pairs(user_key) do
      trace('binding', v)
      local exists = false
      for _, default in pairs(key_maps) do
        if v.func == default.func and (v.mode or 'n') == (default.mode or 'n') and not default.override then
          default.key, default.override, exists = v.key, true, true
          break
        end
      end
      if not exists then
        table.insert(key_maps, v)
      end
    end
  else
    key_maps = _NgConfigValues.keymaps or {}
    log('setting maps to ', key_maps)
  end
  local fmtkey, rfmtkey, nrfmtkey
  require('navigator.formatting')
  for _, value in pairs(key_maps) do
    if value.doc then
      vim.notify('doc field no longer supported in navigator mapping, use desc instead')
    end
    if type(value.func) == 'string' then -- deprecated will remove when 0.8 is out
      vim.notify('keymap config updated: ' .. value.key .. ' func ' .. value.func .. ' should be a function')
      local f = '<Cmd>lua vim.lsp.buf.' .. value.func .. '<CR>'
      if string.find(value.func, 'require') or string.find(value.func, 'vim.') then
        f = '<Cmd>lua ' .. value.func .. '<CR>'
      elseif string.find(value.func, 'diagnostic') then
        local diagnostic = '<Cmd>lua vim.'
        diagnostic = '<Cmd>lua vim.'
        f = diagnostic .. value.func .. '<CR>'
      end

      local k = value.key
      local m = value.mode or 'n'
      if string.find(value.func, 'range_formatting') then
        rfmtkey = value.key
      elseif string.find(value.func, 'format') then
        fmtkey = value.key
      end
      trace('binding', k, f)
      set_keymap(m, k, f, opts)
    end
    if type(value.func) == 'function' then -- new from 0.7.x
      -- neovim 0.7.0

      opts.buffer = key_maps.buffer or value.buffer
      if value.desc then
        opts.desc = value.desc
      end
      opts.buffer = bufnr
      vim.keymap.set(value.mode or 'n', value.key, value.func, opts)
      if string.find(value.desc, 'range format') and value.mode == 'v' then
        rfmtkey = value.key
        if string.find(value.desc, 'range format') and value.mode == 'n' then
          nrfmtkey = value.key
        elseif string.find(value.desc, 'format') then
          fmtkey = value.key
        end
      end
    end
  end
  for _, val in pairs(key_maps) do
    local helper_msg = ''
    if val.desc then
      helper_msg = val.desc
    elseif type(val.func) == 'string' then
      helper_msg = val.func
    end

    local item = (val.mode or 'n') .. '|' .. val.key .. '|' .. helper_msg
    if not vim.tbl_contains(key_maps_help, item) then
      table.insert(key_maps_help, (val.mode or 'n') .. '|' .. val.key .. '|' .. helper_msg)
    end
  end

  -- if user_opts.cap.document_formatting then

  if doc_fmt and _NgConfigValues.lsp.format_on_save then
    local gn = api.nvim_create_augroup('NavAuGroupFormat', {})

    local fopts = _NgConfigValues.lsp.format_options

    if not fopts.async and vim.api.nvim_buf_line_count(0) > 4000 then
      fopts.async = true
    end

    api.nvim_create_autocmd({ 'BufWritePre' }, {
      group = gn,
      buffer = bufnr,
      callback = function()
        trace('format' .. vim.inspect(fopts))
        vim.lsp.buf.format(fopts)
      end,
    })
  elseif fmtkey then
    del_keymap('n', fmtkey)
  end

  if lsp_attach_info.cap and lsp_attach_info.cap.document_range_formatting then
    log('formatting enabled', lsp_attach_info.cap)
  end

  if not range_fmt and rfmtkey then
    del_keymap('v', rfmtkey)
  end

  if not range_fmt and nrfmtkey then
    del_keymap('n', nrfmtkey)
  end
  log('enable format ', doc_fmt, range_fmt, _NgConfigValues.lsp.format_on_save)
end

local function autocmd()
  local gn = api.nvim_create_augroup('NavAuGroupDocHlAu', {})

  api.nvim_create_autocmd({ 'BufWritePre' }, {
    group = gn,
    callback = require('navigator.dochighlight').cmd_nohl,
  })
end

M.toggle_lspformat = function(on)
  if on == nil then
    _NgConfigValues.lsp.format_on_save = not _NgConfigValues.lsp.format_on_save
  else
    _NgConfigValues.lsp.format_on_save = on
  end
  if _NgConfigValues.lsp.format_on_save then
    if on == nil then
      vim.notify('format on save true', vim.lsp.log_levels.INFO)
    end
    vim.cmd([[set eventignore-=BufWritePre]])
  else
    if on == nil then
      vim.notify('format on save false', vim.lsp.log_levels.INFO)
    end
    vim.cmd([[set eventignore+=BufWritePre]])
  end
end

function M.setup(attach_opts)
  if not attach_opts or not attach_opts.client then
    vim.notify(
      'please call require"navigator.mapping".setup({bufnr=bufnr, client=client}) inside on_attach(client,bufnr)',
      vim.lsp.log_levels.WARN
    )
  end
  attach_opts = attach_opts or { bufnr = 0, client = {}, cap = {} }
  set_mapping(attach_opts)
  set_cmds(attach_opts)

  autocmd()

  local client = attach_opts.client or {}
  local cap = client.server_capabilities or vim.lsp.protocol.make_client_capabilities()

  log('lsp cap:', cap.codeActionProvider)

  if cap.call_hierarchy or cap.callHierarchyProvider 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.declarationProvider 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

  -- TODO: when active signature merge to neovim, remove this setup:

  if
    _NgConfigValues.signature_help_cfg and #_NgConfigValues.signature_help_cfg > 0 or _NgConfigValues.lsp_signature_help
  then
    log('setup signature from navigator')
    local hassig, sig = pcall(require, 'lsp_signature')
    if hassig then
      sig.setup(_NgConfigValues.signature_help_cfg or {})
    end
  else
    vim.lsp.handlers['textDocument/signatureHelp'] = vim.lsp.with(require('navigator.signature').signature_handler, {
      border = { '╭', '─', '╮', '│', '╯', '─', '╰', '│' },
    })
  end

  api.nvim_create_autocmd({ 'BufWritePre' }, {
    group = api.nvim_create_augroup('nvim_nv_event_autos', {}),
    buffer = attach_opts.bufnr,
    callback = function()
      require('navigator.diagnostics').set_diag_loclist(attach_opts.bufnr)
    end,
  })

  local border_style = single
  if _NgConfigValues.border == 'double' then
    border_style = double
  end
  vim.lsp.handlers['textDocument/hover'] = vim.lsp.with(vim.lsp.handlers.hover, { border = border_style })
  if cap.documentFormattingProvider then
    log('formatting enabled setup hdl')
    vim.lsp.handlers['textDocument/formatting'] = require('navigator.formatting').format_hdl
  end
end

M.get_keymaps_help = function()
  local ListView = require('guihua.listview')
  local win = ListView:new({
    loc = 'top_center',
    border = 'none',
    prompt = true,
    enter = true,
    rect = { height = 24, width = 50 },
    data = key_maps_help,
  })

  return win
end

return M