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local M = {}

---@alias telescope_themes
---| "cursor"   # see `telescope.themes.get_cursor()`
---| "dropdown" # see `telescope.themes.get_dropdown()`
---| "ivy"      # see `telescope.themes.get_ivy()`
---| "center"   # retain the default telescope theme

function M.config()
  local actions = require("lvim.utils.modules").require_on_exported_call "telescope.actions"
  local config = {
    theme = "dropdown", ---@type telescope_themes
    opts = {
      defaults = {
        prompt_prefix = lvim.icons.ui.Telescope .. " ",
        selection_caret = lvim.icons.ui.Forward .. " ",
        entry_prefix = "  ",
        initial_mode = "insert",
        selection_strategy = "reset",
        sorting_strategy = nil,
        layout_strategy = nil,
        layout_config = {},
        vimgrep_arguments = {
          "rg",
          "--color=never",
          "--no-heading",
          "--with-filename",
          "--line-number",
          "--column",
          "--smart-case",
          "--hidden",
          "--glob=!.git/",
        },
        ---@usage Mappings are fully customizable. Many familiar mapping patterns are setup as defaults.
        mappings = {
          i = {
            ["<C-n>"] = actions.move_selection_next,
            ["<C-p>"] = actions.move_selection_previous,
            ["<C-c>"] = actions.close,
            ["<C-j>"] = actions.cycle_history_next,
            ["<C-k>"] = actions.cycle_history_prev,
            ["<C-q>"] = function(...)
              actions.smart_send_to_qflist(...)
              actions.open_qflist(...)
            end,
            ["<CR>"] = actions.select_default,
          },
          n = {
            ["<C-n>"] = actions.move_selection_next,
            ["<C-p>"] = actions.move_selection_previous,
            ["<C-q>"] = function(...)
              actions.smart_send_to_qflist(...)
              actions.open_qflist(...)
            end,
          },
        },
        file_ignore_patterns = {},
        path_display = { "smart" },
        winblend = 0,
        border = {},
        borderchars = nil,
        color_devicons = true,
        set_env = { ["COLORTERM"] = "truecolor" }, -- default = nil,
      },
      pickers = {
        find_files = {
          hidden = true,
        },
        live_grep = {
          --@usage don't include the filename in the search results
          only_sort_text = true,
        },
        grep_string = {
          only_sort_text = true,
        },
        buffers = {
          initial_mode = "normal",
          mappings = {
            i = {
              ["<C-d>"] = actions.delete_buffer,
            },
            n = {
              ["dd"] = actions.delete_buffer,
            },
          },
        },
        planets = {
          show_pluto = true,
          show_moon = true,
        },
        git_files = {
          hidden = true,
          show_untracked = true,
        },
        colorscheme = {
          enable_preview = true,
        },
      },
      extensions = {
        fzf = {
          fuzzy = true, -- false will only do exact matching
          override_generic_sorter = true, -- override the generic sorter
          override_file_sorter = true, -- override the file sorter
          case_mode = "smart_case", -- or "ignore_case" or "respect_case"
        },
      },
    },
  }
  ---@cast config +LvimBuiltin
  require("lvim.core.builtins").extend_defaults(config)
  lvim.builtin.telescope = config
end

function M.setup()
  local previewers = require "telescope.previewers"
  local sorters = require "telescope.sorters"

  lvim.builtin.telescope.opts = vim.tbl_extend("keep", {
    file_previewer = previewers.vim_buffer_cat.new,
    grep_previewer = previewers.vim_buffer_vimgrep.new,
    qflist_previewer = previewers.vim_buffer_qflist.new,
    file_sorter = sorters.get_fuzzy_file,
    generic_sorter = sorters.get_generic_fuzzy_sorter,
  }, lvim.builtin.telescope.opts)

  local telescope = require "telescope"

  local theme = require("telescope.themes")["get_" .. (lvim.builtin.telescope.opts.theme or "")]
  if theme then
    lvim.builtin.telescope.opts.defaults = theme(lvim.builtin.telescope.opts.defaults)
  end

  telescope.setup(lvim.builtin.telescope.setup)

  if lvim.builtin.project.active then
    pcall(function()
      require("telescope").load_extension "projects"
    end)
  end

  if lvim.builtin.telescope.setup.extensions and lvim.builtin.telescope.setup.extensions.fzf then
    pcall(function()
      require("telescope").load_extension "fzf"
    end)
  end
end

return M