local bind = require('go.keybind')
local utils = require('go.utils')
local log = utils.log
local sep = '.' .. utils.sep()
local getopt = require('go.alt_getopt')
local dapui_setuped
local keys = {}
local long_opts = {
  compile = 'c',
  run = 'r',
  attach = 'a',
  test = 't',
  restart = 'R',
  stop = 's',
  help = 'h',
  nearest = 'n',
  package = 'p',
  file = 'f',
  breakpoint = 'b',
  tag = 'T',
}
local opts = 'tcraRsnpfsbhT:'
local function help()
  return 'Usage: GoDebug [OPTION]\n'
    .. 'Options:\n'
    .. '  -c, --compile         compile\n'
    .. '  -r, --run             run\n'
    .. '  -t, --test            run tests\n'
    .. '  -R, --restart         restart\n'
    .. '  -s, --stop            stop\n'
    .. '  -h, --help            display this help and exit\n'
    .. '  -n, --nearest         debug nearest file\n'
    .. '  -p, --package         debug package\n'
    .. '  -f, --file            display file\n'
    .. '  -b, --breakpoint      set breakpoint'
end

-- not sure if anyone still use telescope for debug
local function setup_telescope()
  require('telescope').setup()
  require('telescope').load_extension('dap')
  local ts_keys = {
    ['n|lb'] = '<cmd>lua require"telescope".extensions.dap.list_breakpoints{}',
    ['n|tv'] = '<cmd>lua require"telescope".extensions.dap.variables{}',
    ['n|bt'] = '<cmd>lua require"telescope".extensions.dap.frames{}',
  }
  bind.nvim_load_mapping(ts_keys)
end

local keymaps_backup
local function keybind()
  if not _GO_NVIM_CFG.dap_debug_keymap then
    return
  end
  -- TODO: put keymaps back
  keymaps_backup = vim.api.nvim_get_keymap('n')
  keys = {
    -- DAP --
    -- run
    ['r'] = { f = require('go.dap').run, desc = 'run' },
    ['c'] = { f = require('dap').continue, desc = 'continue' },
    ['n'] = { f = require('dap').step_over, desc = 'step_over' },
    ['s'] = { f = require('dap').step_into, desc = 'step_into' },
    ['o'] = { f = require('dap').step_out, desc = 'step_out' },
    ['S'] = {
      f = function()
        require('go.dap').stop(true)
      end,
      desc = 'stop debug session',
    },
    ['u'] = { f = require('dap').up, desc = 'up' },
    ['D'] = { f = require('dap').down, desc = 'down' },
    ['C'] = { f = require('dap').run_to_cursor, desc = 'run_to_cursor' },
    ['b'] = { f = require('dap').toggle_breakpoint, desc = 'toggle_breakpoint' },
    ['P'] = { f = require('dap').pause, desc = 'pause' },
    --
  }
  if _GO_NVIM_CFG.dap_debug_gui then
    keys['p'] = { f = require('dapui').eval, m = { 'n', 'v' }, desc = 'eval' }
    keys['K'] = { f = require('dapui').float_element, desc = 'float_element' }
    keys['B'] = {
      f = function()
        require('dapui').float_element('breakpoints')
      end,
      desc = "float_element('breakpoints')",
    }
    keys['R'] = {
      f = function()
        require('dapui').float_element('repl')
      end,
      desc = "float_element('repl')",
    }
    keys['O'] = {
      f = function()
        require('dapui').float_element('scopes')
      end,
      desc = "float_element('scopes')",
    }
    keys['a'] = {
      f = function()
        require('dapui').float_element('stacks')
      end,
      desc = "float_element('stacks')",
    }
    keys['w'] = {
      f = function()
        require('dapui').float_element('watches')
      end,
      desc = "float_element('watches')",
    }
  else
    keys['p'] = { f = require('dap.ui.widgets').hover, m = { 'n', 'v' }, desc = 'hover' }
  end
  bind.nvim_load_mapping(keys)
end

local function get_test_build_tags()
  local get_build_tags = require('go.gotest').get_build_tags
  local tags = get_build_tags({})
  if tags then
    return tags
  else
    return ''
  end
end

local M = {}

function M.debug_keys()
  local keymap_help = {}
  for key, val in pairs(keys) do
    -- local m = vim.fn.matchlist(val, [[\v(\p+)\.(\p+\(\p*\))]]) -- match last function e.g.float_element("repl")

    table.insert(keymap_help, key .. ' -> ' .. val.desc)
  end

  local guihua = utils.load_plugin('guihua.lua', 'guihua.listview')

  if guihua then
    local ListView = require('guihua.listview')
    return ListView:new({
      loc = 'top_center',
      border = 'none',
      prompt = true,
      enter = true,
      rect = { height = 20, width = 50 },
      data = keymap_help,
    })
  end

  local close_events = { 'CursorMoved', 'CursorMovedI', 'BufHidden', 'InsertCharPre' }
  local config = { close_events = close_events, focusable = true, border = 'single' }
  vim.lsp.util.open_floating_preview(keymap_help, 'lua', config)
end

M.prepare = function()
  utils.load_plugin('nvim-dap', 'dap')
  if _GO_NVIM_CFG.icons ~= false then
    vim.fn.sign_define('DapBreakpoint', {
      text = _GO_NVIM_CFG.icons.breakpoint,
      texthl = '',
      linehl = '',
      numhl = '',
    })
    vim.fn.sign_define('DapStopped', {
      text = _GO_NVIM_CFG.icons.currentpos,
      texthl = '',
      linehl = '',
      numhl = '',
    })
  end
  local dapui_cfg = _GO_NVIM_CFG.dap_debug_gui
  if dapui_cfg then
    utils.load_plugin('nvim-dap-ui', 'dapui')
    if dapui_setuped ~= true then
      if dapui_cfg == true then
        dapui_cfg = {}
      end
      require('dapui').setup(dapui_cfg)
      dapui_setuped = true
    end
  end
  if _GO_NVIM_CFG.dap_debug_vt then
    if _GO_NVIM_CFG.dap_debug_vt == true then
      _GO_NVIM_CFG.dap_debug_vt = { enabled_commands = true, all_frames = true }
    end
    local vt = utils.load_plugin('nvim-dap-virtual-text')
    vt.setup(_GO_NVIM_CFG.dap_debug_vt)
  end
end

M.breakpt = function()
  M.prepare()
  require('dap').toggle_breakpoint()
end

M.save_brks = function()
  M.prepare()
  local bks = require('dap.breakpoints').get()
  local all_bks = {}
  if bks and next(bks) then
    local _, fld = require('go.project').setup()
    for bufnr, bk in pairs(bks) do
      local uri = vim.uri_from_bufnr(bufnr)
      local _bk = {}
      for _, value in pairs(bk) do
        table.insert(_bk, { line = value.line })
      end
      all_bks[uri] = _bk
    end
    local bkfile = fld .. utils.sep() .. 'breakpoints.lua'
    local writeStr = 'return ' .. vim.inspect(all_bks)

    local writeLst = vim.split(writeStr, '\n')

    vim.fn.writefile(writeLst, bkfile, 'b')
  end
end

M.load_brks = function()
  M.prepare()
  local _, brkfile = require('go.project').project_existed()
  if vim.fn.filereadable(brkfile) == 0 then
    return
  end
  local f = assert(loadfile(brkfile))
  local brks = f()
  for uri, brk in pairs(brks) do
    local bufnr = vim.uri_to_bufnr(uri)
    if not vim.api.nvim_buf_is_loaded(bufnr) then
      vim.fn.bufload(bufnr)
    end
    for index, lnum in ipairs(brk) do
      require('dap.breakpoints').set({}, bufnr, lnum.line)
    end
  end
end

M.clear_bks = function()
  utils.load_plugin('nvim-dap', 'dap')

  require('dap.breakpoints').clear()
  M.save_bks()
  local _, brkfile = require('go.project').project_existed()
  if vim.fn.filereadable(brkfile) == 0 then
    return
  end
  local f = assert(loadfile(brkfile))
  local brks = f()
  for uri, brk in pairs(brks) do
    local bufnr = vim.uri_to_bufnr(uri)
    if not vim.api.nvim_buf_is_loaded(bufnr) then
      vim.fn.bufload(bufnr)
    end
    for _, lnum in ipairs(brk) do
      require('dap.breakpoints').set({}, bufnr, lnum.line)
    end
  end
end

local function dapui_opened()
  local lys = require('dapui.windows').layouts or {}
  local opened = false
  for _, ly in ipairs(lys) do
    if ly:is_open() == true then
      opened = true
    end
  end
  return opened
end

local stdout, stderr, handle
M.run = function(...)
  local args = { ... }
  local mode = 'test'

  local optarg, optind = getopt.get_opts(args, opts, long_opts)
  log(optarg, optind)

  if optarg['h'] then
    return utils.info(help())
  end

  if optarg['c'] then
    local fpath = vim.fn.expand('%:p:h')
    local out = vim.fn.systemlist(table.concat({
      'go',
      'test',
      '-v',
      '-cover',
      '-covermode=atomic',
      '-coverprofile=cover.out',
      '-tags ' .. _GO_NVIM_CFG.build_tags,
      '-c',
      fpath,
    }, ' '))
    if #out ~= 0 then
      utils.info('building ' .. vim.inspect(out))
    end
    return
  end

  if optarg['b'] then
    return require('dap').toggle_breakpoint()
  end

  local guihua = utils.load_plugin('guihua.lua', 'guihua.gui')

  local original_select = vim.ui.select
  if guihua then
    vim.ui.select = require('guihua.gui').select
  end

  -- testopts = {"test", "nearest", "file", "stop", "restart"}
  log('plugin loaded', mode, optarg)

  if optarg['s'] and (optarg['t'] or optarg['r']) then
    M.stop(false)
  elseif optarg['s'] then
    return M.stop(true)
  end

  -- restart
  if optarg['R'] then
    M.stop(false)
    if optarg['t'] then
      mode = 'test'
    else
      mode = M.pre_mode or 'file'
    end
  else
    M.pre_mode = mode
  end

  M.prepare()
  local session = require('dap').session()
  if session ~= nil and session.initialized == true then
    if not optarg['R'] then
      utils.info('debug session already started, press c to continue')
      return
    else
      utils.info('debug session already started, press c to restart and stop the session')
    end
  end

  local run_cur = optarg['r'] -- undocumented mode, smartrun current program in interactive mode
  -- e.g. edit and run
  local testfunc

  if not run_cur then
    keybind()
  else
    M.stop() -- rerun
    testfunc = require('go.gotest').get_test_func_name()
    if testfunc and not string.find(testfunc.name, '[T|t]est') then
      log('no test func found', testfunc.name)
      testfunc = nil -- no test func avalible, run main
    end
  end

  if _GO_NVIM_CFG.dap_debug_gui and not run_cur then
    if not dapui_opened() then
      require('dapui').open()
    end
  end

  local port = _GO_NVIM_CFG.dap_port
  if _GO_NVIM_CFG.dap_port == -1 then
    math.randomseed(os.time())
    port = 38000 + math.random(1, 1000)
  end
  local dap = require('dap')

  local con_options = {
    max_retries = _GO_NVIM_CFG.dap_retries,
    initialize_timeout_sec = _GO_NVIM_CFG.dap_timeout,
  }
  dap.adapters.go = function(callback, config)
    stdout = vim.loop.new_pipe(false)
    stderr = vim.loop.new_pipe(false)
    local pid_or_err
    port = config.port or port

    local host = config.host or '127.0.0.1'

    local addr = string.format('%s:%d', host, port)
    local function onread(err, data)
      if err then
        log(err, data)
        -- print('ERROR: ', err)
        vim.notify('dlv exited with code ' + tostring(err), vim.log.levels.WARN)
      end
      if not data or data == '' then
        return
      end
      if data:find("couldn't start") then
        vim.schedule(function()
          utils.error(data)
        end)
      end

      vim.schedule(function()
        require('dap.repl').append(data)
      end)
    end

    handle, pid_or_err = vim.loop.spawn('dlv', {
      stdio = { nil, stdout, stderr },
      args = { 'dap', '-l', addr },
      initialize_timeout_sec = con_options.initialize_timeout_sec,
      detached = true,
    }, function(code)
      if code ~= 0 then
        vim.schedule(function()
          log('Dlv exited', code)
          vim.notify(string.format('Delve exited with exit code: %d', code), vim.log.levels.WARN)
          _GO_NVIM_CFG.dap_port = _GO_NVIM_CFG.dap_port + 1
        end)
      end

      _ = stdout and stdout:close()
      _ = stderr and stderr:close()
      _ = handle and handle:close()
      stdout = nil
      stderr = nil
      handle = nil
    end)
    assert(handle, 'Error running dlv: ' .. tostring(pid_or_err))
    stdout:read_start(onread)
    stderr:read_start(onread)

    vim.defer_fn(function()
      callback({ type = 'server', host = host, port = port, options = con_options })
    end, 1000)
  end

  log(get_test_build_tags())
  local dap_cfg = {
    type = 'go',
    name = 'Debug',
    request = 'launch',
    dlvToolPath = vim.fn.exepath('dlv'),
    buildFlags = get_test_build_tags(),
    options = con_options,
  }

  local empty = utils.empty

  local launch = require('go.launch')
  local cfg_exist, cfg_file = launch.vs_launch()
  log(mode, cfg_exist, cfg_file)

  -- if breakpoint is not set add breakpoint at current pos
  local pts = require('dap.breakpoints').get()
  if utils.empty(pts) then
    vim.notify('no breakpoint set, add breakpoint at current line', vim.log.levels.INFO)
    require('dap').set_breakpoint()
  end

  testfunc = require('go.gotest').get_test_func_name()
  log(testfunc)

  local tblcase_ns = require('go.gotest').get_testcase_name()

  log(tblcase_ns)
  if empty(tblcase_ns) then
    vim.notify('put cursor on test case name string')
  end

  local tbl_name = ''
  if tblcase_ns and tblcase_ns.name then
    vim.notify('running test case: ' .. tblcase_ns.name)
    tbl_name = tblcase_ns.name
    tbl_name = tbl_name:gsub('"', '') -- remove "
    tbl_name = tbl_name:gsub(' ', '_') -- remove space
    tbl_name = tbl_name:gsub('/', '//')
    tbl_name = tbl_name:gsub('%(', '\\(')
    tbl_name = tbl_name:gsub('%)', '\\)')
    tbl_name = '/' .. tbl_name
  end

  log(tblcase_ns)

  if testfunc then
    if testfunc.name ~= 'main' then
      optarg['t'] = true
    end
  end
  if optarg['t'] then
    dap_cfg.name = dap_cfg.name .. ' test'
    dap_cfg.mode = 'test'
    dap_cfg.request = 'launch'
    dap_cfg.program = sep .. '${relativeFileDirname}'

    if testfunc then
      if testfunc.name:lower():find('bench') then
        dap_cfg.args = { '-test.bench', '^' .. testfunc.name .. '$' }
      else
        dap_cfg.args = { '-test.run=^' .. testfunc.name .. '$' .. tbl_name }
        -- dap_cfg.args = { [[-test.run=^TestTransactionCheckEngine_Check$/should_process]]}
      end
    end
    dap.configurations.go = { dap_cfg }
    dap.continue()
  elseif optarg['n'] then
    local ns = require('go.ts.go').get_func_method_node_at_pos()
    if empty(ns) then
      log('ts not not found, debug while file')
    end
    dap_cfg.name = dap_cfg.name .. ' test_nearest'
    dap_cfg.mode = 'test'
    dap_cfg.request = 'launch'
    dap_cfg.program = sep .. '${relativeFileDirname}'
    if not empty(ns) then
      dap_cfg.args = { '-test.run', '^' .. ns.name }
    end
    dap.configurations.go = { dap_cfg }
    dap.continue()
  elseif optarg['a'] then
    dap_cfg.name = dap_cfg.name .. ' attach'
    dap_cfg.mode = 'local'
    dap_cfg.request = 'attach'
    dap_cfg.processId = require('dap.utils').pick_process
    dap.configurations.go = { dap_cfg }
    dap.continue()
  elseif optarg['p'] then
    dap_cfg.name = dap_cfg.name .. ' package'
    dap_cfg.mode = 'test'
    dap_cfg.request = 'launch'
    dap_cfg.program = sep .. '${fileDirname}'
    dap.configurations.go = { dap_cfg }
    dap.continue()
  elseif run_cur then
    dap_cfg.name = dap_cfg.name .. ' run current'
    dap_cfg.request = 'launch'
    dap_cfg.mode = 'debug'
    dap_cfg.request = 'launch'
    if testfunc then
      dap_cfg.args = { '-test.run', '^' .. testfunc.name .. '$' }
      dap_cfg.mode = 'test'
    end
    dap_cfg.program = sep .. '${relativeFileDirname}'
    dap.configurations.go = { dap_cfg }
    dap.continue()
    -- dap.run_to_cursor()
  elseif cfg_exist then
    log('using launch cfg')
    launch.load()
    log(dap.configurations.go)
    for _, cfg in ipairs(dap.configurations.go) do
      cfg.dlvToolPath = vim.fn.exepath('dlv')
    end
    dap.continue()
  else -- no args
    log('debug main')
    dap_cfg.program = sep .. '${relativeFileDirname}'
    dap_cfg.args = args
    dap_cfg.mode = 'debug'
    dap_cfg.request = 'launch'
    dap.configurations.go = { dap_cfg }
    dap.continue()
  end
  log(dap_cfg, args, optarg)

  M.pre_mode = dap_cfg.mode or M.pre_mode

  vim.ui.select = original_select
end

local unmap = function()
  if not _GO_NVIM_CFG.dap_debug_keymap then
    return
  end
  local unmap_keys = {
    'r',
    'c',
    'n',
    's',
    'o',
    'S',
    'u',
    'D',
    'C',
    'b',
    'P',
    'p',
    'K',
    'B',
    'R',
    'O',
    'a',
    'w',
  }
  for _, value in pairs(unmap_keys) do
    local cmd = 'silent! unmap ' .. value
    vim.cmd(cmd)
  end

  vim.cmd([[silent! vunmap p]])

  for _, k in pairs(unmap_keys) do
    for _, v in pairs(keymaps_backup or {}) do
      if v.lhs == k then
        local nr = (v.noremap == 1)
        local sl = (v.slient == 1)
        local exp = (v.expr == 1)
        local mode = v.mode
        local desc = v.desc or 'go-dap'
        if v.mode == ' ' then
          mode = { 'n', 'v' }
        end

        log(v)
        vim.keymap.set(mode, v.lhs, v.rhs or v.callback, { noremap = nr, silent = sl, expr = exp, desc = desc })
        -- vim.api.nvim_set_keymap('n', v.lhs, v.rhs, {noremap=nr, silent=sl, expr=exp})
      end
    end
  end
  keymaps_backup = {}
end

M.disconnect_dap = function()
  local has_dap, dap = pcall(require, 'dap')
  if has_dap then
    dap.disconnect()
    vim.cmd('sleep 100m') -- allow cleanup
  else
    vim.notify('dap not found')
  end
end

M.stop = function(unm)
  if unm then
    unmap()
  end
  M.disconnect_dap()

  local has_dapui, dapui = pcall(require, 'dapui')
  if has_dapui then
    if dapui_opened() then
      log('closing dapui')
      dapui.close()
    end
  end

  if stdout then
    stdout:close()
    stdout = nil
  end
  if stderr then
    stderr:close()
    stderr = nil
  end
  if handle then
    handle:close()
    handle = nil
  end
end

function M.ultest_post()
  vim.g.ultest_use_pty = 1
  local builders = {
    ['go#richgo'] = function(cmd)
      local args = {}
      for i = 3, #cmd, 1 do
        local arg = cmd[i]
        if vim.startswith(arg, '-') then
          arg = '-test.' .. string.sub(arg, 2)
        end
        args[#args + 1] = arg
      end

      return {
        dap = {
          type = 'go',
          request = 'launch',
          mode = 'test',
          program = sep .. '${relativeFileDirname}',
          dlvToolPath = vim.fn.exepath('dlv'),
          args = args,
          buildFlags = get_test_build_tags(),
        },
        parse_result = function(lines)
          return lines[#lines] == 'FAIL' and 1 or 0
        end,
      }
    end,
  }

  local ul = utils.load_plugin('vim-ultest', 'ultest')
  if ul then
    ul.setup({ builders = builders })
  end
end

return M