local Util = require("lazy.core.util")

local M = {}

M.root_patterns = { ".git", "lua" }

---@param on_attach fun(client, buffer)
function M.on_attach(on_attach)
  vim.api.nvim_create_autocmd("LspAttach", {
    callback = function(args)
      local buffer = args.buf
      local client = vim.lsp.get_client_by_id(args.data.client_id)
      on_attach(client, buffer)
    end,
  })
end

---@param plugin string
function M.has(plugin)
  return require("lazy.core.config").spec.plugins[plugin] ~= nil
end

function M.fg(name)
  ---@type {foreground?:number}?
  local hl = vim.api.nvim_get_hl and vim.api.nvim_get_hl(0, { name = name }) or vim.api.nvim_get_hl_by_name(name, true)
  local fg = hl and hl.fg or hl.foreground
  return fg and { fg = string.format("#%06x", fg) }
end

---@param fn fun()
function M.on_very_lazy(fn)
  vim.api.nvim_create_autocmd("User", {
    pattern = "VeryLazy",
    callback = function()
      fn()
    end,
  })
end

---@param name string
function M.opts(name)
  local plugin = require("lazy.core.config").plugins[name]
  if not plugin then
    return {}
  end
  local Plugin = require("lazy.core.plugin")
  return Plugin.values(plugin, "opts", false)
end

-- returns the root directory based on:
-- * lsp workspace folders
-- * lsp root_dir
-- * root pattern of filename of the current buffer
-- * root pattern of cwd
---@return string
function M.get_root()
  ---@type string?
  local path = vim.api.nvim_buf_get_name(0)
  path = path ~= "" and vim.loop.fs_realpath(path) or nil
  ---@type string[]
  local roots = {}
  if path then
    for _, client in pairs(vim.lsp.get_active_clients({ bufnr = 0 })) do
      local workspace = client.config.workspace_folders
      local paths = workspace and vim.tbl_map(function(ws)
        return vim.uri_to_fname(ws.uri)
      end, workspace) or client.config.root_dir and { client.config.root_dir } or {}
      for _, p in ipairs(paths) do
        local r = vim.loop.fs_realpath(p)
        if path:find(r, 1, true) then
          roots[#roots + 1] = r
        end
      end
    end
  end
  table.sort(roots, function(a, b)
    return #a > #b
  end)
  ---@type string?
  local root = roots[1]
  if not root then
    path = path and vim.fs.dirname(path) or vim.loop.cwd()
    ---@type string?
    root = vim.fs.find(M.root_patterns, { path = path, upward = true })[1]
    root = root and vim.fs.dirname(root) or vim.loop.cwd()
  end
  ---@cast root string
  return root
end

-- this will return a function that calls telescope.
-- cwd will default to lazyvim.util.get_root
-- for `files`, git_files or find_files will be chosen depending on .git
function M.telescope(builtin, opts)
  local params = { builtin = builtin, opts = opts }
  return function()
    builtin = params.builtin
    opts = params.opts
    opts = vim.tbl_deep_extend("force", { cwd = M.get_root() }, opts or {})
    if builtin == "files" then
      if vim.loop.fs_stat((opts.cwd or vim.loop.cwd()) .. "/.git") then
        opts.show_untracked = true
        builtin = "git_files"
      else
        builtin = "find_files"
      end
    end
    if opts.cwd and opts.cwd ~= vim.loop.cwd() then
      opts.attach_mappings = function(_, map)
        map("i", "<a-c>", function()
          local action_state = require("telescope.actions.state")
          local line = action_state.get_current_line()
          M.telescope(
            params.builtin,
            vim.tbl_deep_extend("force", {}, params.opts or {}, { cwd = false, default_text = line })
          )()
        end)
        return true
      end
    end

    require("telescope.builtin")[builtin](opts)
  end
end

---@type table<string,LazyFloat>
local terminals = {}

-- Opens a floating terminal (interactive by default)
---@param cmd? string[]|string
---@param opts? LazyCmdOptions|{interactive?:boolean, esc_esc?:false, ctrl_hjkl?:false}
function M.float_term(cmd, opts)
  opts = vim.tbl_deep_extend("force", {
    ft = "lazyterm",
    size = { width = 0.9, height = 0.9 },
  }, opts or {}, { persistent = true })
  ---@cast opts LazyCmdOptions|{interactive?:boolean, esc_esc?:false}

  local termkey = vim.inspect({ cmd = cmd or "shell", cwd = opts.cwd, env = opts.env, count = vim.v.count1 })

  if terminals[termkey] and terminals[termkey]:buf_valid() then
    terminals[termkey]:toggle()
  else
    terminals[termkey] = require("lazy.util").float_term(cmd, opts)
    local buf = terminals[termkey].buf
    vim.b[buf].lazyterm_cmd = cmd
    if opts.esc_esc == false then
      vim.keymap.set("t", "<esc>", "<esc>", { buffer = buf, nowait = true })
    end
    if opts.ctrl_hjkl == false then
      vim.keymap.set("t", "<c-h>", "<c-h>", { buffer = buf, nowait = true })
      vim.keymap.set("t", "<c-j>", "<c-j>", { buffer = buf, nowait = true })
      vim.keymap.set("t", "<c-k>", "<c-k>", { buffer = buf, nowait = true })
      vim.keymap.set("t", "<c-l>", "<c-l>", { buffer = buf, nowait = true })
    end

    vim.api.nvim_create_autocmd("BufEnter", {
      buffer = buf,
      callback = function()
        vim.cmd.startinsert()
      end,
    })
  end

  return terminals[termkey]
end

---@param silent boolean?
---@param values? {[1]:any, [2]:any}
function M.toggle(option, silent, values)
  if values then
    if vim.opt_local[option]:get() == values[1] then
      vim.opt_local[option] = values[2]
    else
      vim.opt_local[option] = values[1]
    end
    return Util.info("Set " .. option .. " to " .. vim.opt_local[option]:get(), { title = "Option" })
  end
  vim.opt_local[option] = not vim.opt_local[option]:get()
  if not silent then
    if vim.opt_local[option]:get() then
      Util.info("Enabled " .. option, { title = "Option" })
    else
      Util.warn("Disabled " .. option, { title = "Option" })
    end
  end
end

local enabled = true
function M.toggle_diagnostics()
  enabled = not enabled
  if enabled then
    vim.diagnostic.enable()
    Util.info("Enabled diagnostics", { title = "Diagnostics" })
  else
    vim.diagnostic.disable()
    Util.warn("Disabled diagnostics", { title = "Diagnostics" })
  end
end

function M.deprecate(old, new)
  Util.warn(("`%s` is deprecated. Please use `%s` instead"):format(old, new), { title = "LazyVim" })
end

-- delay notifications till vim.notify was replaced or after 500ms
function M.lazy_notify()
  local notifs = {}
  local function temp(...)
    table.insert(notifs, vim.F.pack_len(...))
  end

  local orig = vim.notify
  vim.notify = temp

  local timer = vim.loop.new_timer()
  local check = vim.loop.new_check()

  local replay = function()
    timer:stop()
    check:stop()
    if vim.notify == temp then
      vim.notify = orig -- put back the original notify if needed
    end
    vim.schedule(function()
      ---@diagnostic disable-next-line: no-unknown
      for _, notif in ipairs(notifs) do
        vim.notify(vim.F.unpack_len(notif))
      end
    end)
  end

  -- wait till vim.notify has been replaced
  check:start(function()
    if vim.notify ~= temp then
      replay()
    end
  end)
  -- or if it took more than 500ms, then something went wrong
  timer:start(500, 0, replay)
end

function M.lsp_get_config(server)
  local configs = require("lspconfig.configs")
  return rawget(configs, server)
end

---@param server string
---@param cond fun( root_dir, config): boolean
function M.lsp_disable(server, cond)
  local util = require("lspconfig.util")
  local def = M.lsp_get_config(server)
  def.document_config.on_new_config = util.add_hook_before(def.document_config.on_new_config, function(config, root_dir)
    if cond(root_dir, config) then
      config.enabled = false
    end
  end)
end

---@param name string
---@param fn fun(name:string)
function M.on_load(name, fn)
  local Config = require("lazy.core.config")
  if Config.plugins[name] and Config.plugins[name]._.loaded then
    vim.schedule(function()
      fn(name)
    end)
  else
    vim.api.nvim_create_autocmd("User", {
      pattern = "LazyLoad",
      callback = function(event)
        if event.data == name then
          fn(name)
          return true
        end
      end,
    })
  end
end

function M.changelog()
  local lv = require("lazy.core.config").plugins.LazyVim
  local float = require("lazy.util").open(lv.dir .. "/CHANGELOG.md")
  vim.wo[float.win].spell = false
  vim.wo[float.win].wrap = false
  vim.diagnostic.disable(float.buf)
end

return M