local bind = require("go.keybind")
local map_cr = bind.map_cr
local utils = require("go.utils")
local log = utils.log
local sep = "." .. utils.sep()
local getopt = require("go.alt_getopt")

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 and run\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\n"
    .. "  -T, --tag             set tag"
end

local function setup_telescope()
  require("telescope").setup()
  require("telescope").load_extension("dap")
  local ts_keys = {
    ["n|lb"] = map_cr('<cmd>lua require"telescope".extensions.dap.list_breakpoints{}'):with_noremap():with_silent(),
    ["n|tv"] = map_cr('<cmd>lua require"telescope".extensions.dap.variables{}'):with_noremap():with_silent(),
    ["n|bt"] = map_cr('<cmd>lua require"telescope".extensions.dap.frames{}'):with_noremap():with_silent(),
  }
  bind.nvim_load_mapping(ts_keys)
end

local function keybind()
  if not _GO_NVIM_CFG.dap_debug_keymap then
    return
  end
  local keys = {
    -- DAP --
    -- run
    ["n|r"] = map_cr('<cmd>lua require"go.dap".run()<CR>'):with_noremap():with_silent(),
    ["n|c"] = map_cr('<cmd>lua require"dap".continue()<CR>'):with_noremap():with_silent(),
    ["n|n"] = map_cr('<cmd>lua require"dap".step_over()<CR>'):with_noremap():with_silent(),
    ["n|s"] = map_cr('<cmd>lua require"dap".step_into()<CR>'):with_noremap():with_silent(),
    ["n|o"] = map_cr('<cmd>lua require"dap".step_out()<CR>'):with_noremap():with_silent(),
    ["n|S"] = map_cr('<cmd>lua require"go.dap".stop()<CR>'):with_noremap():with_silent(),
    ["n|u"] = map_cr('<cmd>lua require"dap".up()<CR>'):with_noremap():with_silent(),
    ["n|D"] = map_cr('<cmd>lua require"dap".down()<CR>'):with_noremap():with_silent(),
    ["n|C"] = map_cr('<cmd>lua require"dap".run_to_cursor()<CR>'):with_noremap():with_silent(),
    ["n|b"] = map_cr('<cmd>lua require"dap".toggle_breakpoint()<CR>'):with_noremap():with_silent(),
    ["n|P"] = map_cr('<cmd>lua require"dap".pause()<CR>'):with_noremap():with_silent(),
    --
  }
  if _GO_NVIM_CFG.dap_debug_gui then
    keys["n|p"] = map_cr('<cmd>lua require("dapui").eval()'):with_noremap():with_silent()
    keys["v|p"] = map_cr('<cmd>lua require("dapui").eval()'):with_noremap():with_silent()
    keys["n|K"] = map_cr('<cmd>lua require("dapui").float_element()'):with_noremap():with_silent()
    keys["n|B"] = map_cr('<cmd>lua require("dapui").float_element("breakpoints")'):with_noremap():with_silent()
    keys["n|R"] = map_cr('<cmd>lua require("dapui").float_element("repl")'):with_noremap():with_silent()
    keys["n|O"] = map_cr('<cmd>lua require("dapui").float_element("scopes")'):with_noremap():with_silent()
    keys["n|a"] = map_cr('<cmd>lua require("dapui").float_element("stacks")'):with_noremap():with_silent()
    keys["n|w"] = map_cr('<cmd>lua require("dapui").float_element("watches")'):with_noremap():with_silent()
  else
    keys["n|p"] = map_cr('<cmd>lua require"dap.ui.widgets".hover()<CR>'):with_noremap():with_silent()
    keys["v|p"] = map_cr('<cmd>lua require"dap.ui.widgets".hover()<CR>'):with_noremap():with_silent()
  end
  bind.nvim_load_mapping(keys)
end

local function get_build_flags()
  if _GO_NVIM_CFG.build_tags ~= "" then
    return "-tags " .. _GO_NVIM_CFG.build_tags
  else
    return ""
  end
end

local M = {}

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
  if _GO_NVIM_CFG.dap_debug_gui then
    utils.load_plugin("nvim-dap-ui", "dapui")
  end
  if _GO_NVIM_CFG.dap_debug_vt then
    local vt = utils.load_plugin("nvim-dap-virtual-text")
    vt.setup({ enabled_commands = true, all_frames = true })
  end
end

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

M.run = function(...)
  local args = { ... }
  local mode = select(1, ...)
  if mode == "test" or mode == "nearest" then
    utils.warn("option test is deprecated, options are " .. opts .. " ")
    return utils.info(help())
  end

  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

  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
    require("go.dap").stop()
    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
    vim.notify("debug session already start, press c to continue", vim.lsp.log_levels.INFO)
    return
  end
  local run_cur = optarg["r"]
  if not run_cur then
    keybind()
  else
    M.stop()
  end

  if _GO_NVIM_CFG.dap_debug_gui and not run_cur then
    require("dapui").setup()
    if not require("dapui.windows").sidebar:is_open() then
      require("dapui").open()
    end
  end

  local port = _GO_NVIM_CFG.dap_port
  if _GO_NVIM_CFG.dap_port == nil or _GO_NVIM_CFG.dap_port == -1 then
    math.randomseed(os.time())
    port = 38000 + math.random(1, 1000)
  end
  local dap = require("dap")
  dap.adapters.go = function(callback, config)
    local stdout = vim.loop.new_pipe(false)
    local handle
    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)

    handle, pid_or_err = vim.loop.spawn("dlv", {
      stdio = { nil, stdout },
      args = { "dap", "-l", addr },
      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.lsp.log_levels.WARN)
          if _GO_NVIM_CFG.dap_port ~= nil then
            _GO_NVIM_CFG.dap_port = _GO_NVIM_CFG.dap_port + 1
          end
        end)
      end

      stdout:close()
      handle:close()
    end)
    assert(handle, "Error running dlv: " .. tostring(pid_or_err))
    stdout:read_start(function(err, chunk)
      assert(not err, err)
      if chunk then
        vim.schedule(function()
          require("dap.repl").append(chunk)
        end)
        log(chunk)
        if chunk:find("couldn't start") then
          utils.error(chunk)
        end
      end
    end)
    -- Wait 500ms for delve to start

    if not optarg["r"] then
      dap.repl.open()
    end
    vim.defer_fn(function()
      callback({ type = "server", host = host, port = port })
    end, 500)
  end

  local dap_cfg = {
    type = "go",
    name = "Debug",
    request = "launch",
    dlvToolPath = vim.fn.exepath("dlv"),
    buildFlags = get_build_flags(),
  }

  local row, col = unpack(vim.api.nvim_win_get_cursor(0))
  row, col = row, col + 1

  local empty = utils.empty
  local ns = require("go.ts.go").get_func_method_node_at_pos(row, col)
  if empty(ns) then
    log("ts not not found, debug while file")
  end

  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 #pts == 0 then
    require("dap").toggle_breakpoint()
  end

  if optarg["t"] then
    dap_cfg.name = dap_cfg.name .. " test"
    dap_cfg.mode = "test"
    dap_cfg.request = "launch"
    -- dap_cfg.program = "${workspaceFolder}"
    -- dap_cfg.program = "${file}"
    dap_cfg.program = sep .. "${relativeFileDirname}"
    dap.configurations.go = { dap_cfg }

    log(dap_cfg)

    dap.continue()
  elseif optarg["n"] then
    dap_cfg.name = dap_cfg.name .. " test_nearest"
    dap_cfg.mode = "test"
    dap_cfg.request = "launch"
    dap_cfg.program = sep .. "${relativeFileDirname}"
    dap_cfg.args = { "-test.run", "^" .. ns.name }
    log(dap_cfg)
    dap.configurations.go = { dap_cfg }
    dap.continue()
  elseif optarg["a"] then
    dap_cfg.name = dap_cfg.name .. " attach"
    dap_cfg.mode = "local"
    dap_cfg.request = "attach"
    dap_cfg.processId = require("dap.utils").pick_process
    log(dap_cfg)
    dap.configurations.go = { dap_cfg }
    dap.continue()
  elseif optarg["p"] then
    dap_cfg.name = dap_cfg.name .. " package"
    dap_cfg.request = "launch"
    dap_cfg.program = sep .. "${fileDirname}"
    log(dap_cfg)
    dap.configurations.go = { dap_cfg }
    dap.continue()
  elseif run_cur then
    dap_cfg.name = dap_cfg.name .. " run current"
    -- dap_cfg.mode = "test"
    dap_cfg.request = "launch"
    dap_cfg.program = sep .. "${relativeFileDirname}"
    log(dap_cfg)
    dap.configurations.go = { dap_cfg }
    dap.continue()
  elseif cfg_exist then
    log("using cfg")
    launch.load()
    for _, cfg in ipairs(dap.configurations.go) do
      cfg.dlvToolPath = vim.fn.exepath("dlv")
    end
    dap.continue()
  else
    dap_cfg.program = sep .. "${relativeFileDirname}"
    dap_cfg.args = args
    dap_cfg.request = "launch"
    dap.configurations.go = { dap_cfg }
    dap.continue()
  end
  log(dap_cfg, args)

  vim.ui.select = original_select
end

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

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

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

  local has_dap, dap = pcall(require, "dap")
  if has_dap then
    require("dap").disconnect()
    require("dap").repl.close()
  end
  local has_dapui, dapui = pcall(require, "dapui")
  if has_dapui then
    if require("dapui.windows").sidebar ~= nil then
      dapui.close()
    end
  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_build_flags(),
        },
        parse_result = function(lines)
          return lines[#lines] == "FAIL" and 1 or 0
        end,
      }
    end,
  }

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

return M