local telescope = require('telescope')

telescope.setup({
    defaults = {
        file_ignore_patterns = { '.git' },
        mappings = {
            i = {
                ['<C-o>'] = { '<Esc>', type = 'command' },
                ['<Esc>'] = 'close',
                ['<C-s>'] = 'select_horizontal',
            },
            n = {
                q = 'close',
                ['<C-o>'] = { '<Nop>', type = 'command' },
                ['<C-s>'] = 'select_horizontal',
            },
        },
        sorting_strategy = 'ascending',
        layout_config = {
            prompt_position = 'top',
        },
        prompt_prefix = '❯ ',
        selection_caret = '❯ ',
        multi_icon = '●',
    },
    pickers = {
        buffers = {
            mappings = {
                n = {
                    dd = 'delete_buffer',
                },
            },
        },
        find_files = {
            hidden = true,
        },
        lsp_code_actions = {
            initial_mode = 'normal',
        },
        lsp_range_code_actions = {
            initial_mode = 'normal',
        },
    },
})

telescope.load_extension('fzf')

-- taken from https://github.com/nvim-telescope/telescope-ui-select.nvim for code actions
telescope.register_extension {
    setup = function(topts)
        local specific_opts = vim.F.if_nil(topts.specific_opts, {})
        topts.specific_opts = nil

        if #topts == 1 and topts[1] ~= nil then
            topts = topts[1]
        end

        local pickers = require "telescope.pickers"
        local finders = require "telescope.finders"
        local conf = require("telescope.config").values
        local actions = require "telescope.actions"
        local action_state = require "telescope.actions.state"
        local strings = require "plenary.strings"
        local entry_display = require "telescope.pickers.entry_display"
        local utils = require "telescope.utils"

        __TelescopeUISelectSpecificOpts = vim.F.if_nil(
            __TelescopeUISelectSpecificOpts,
            vim.tbl_extend("keep", specific_opts, {
                ["codeaction"] = {
                    make_indexed = function(items)
                        local indexed_items = {}
                        local widths = {
                            idx = 0,
                            command_title = 0,
                            client_name = 0,
                        }
                        for idx, item in ipairs(items) do
                            local client = vim.lsp.get_client_by_id(item[1])
                            local entry = {
                                idx = idx,
                                ["add"] = {
                                    command_title = item[2].title:gsub("\r\n", "\\r\\n"):gsub("\n", "\\n"),
                                    client_name = client and client.name or "",
                                },
                                text = item,
                            }
                            table.insert(indexed_items, entry)
                            widths.idx = math.max(widths.idx, strings.strdisplaywidth(entry.idx))
                            widths.command_title = math.max(widths.command_title,
                                strings.strdisplaywidth(entry.add.command_title))
                            widths.client_name = math.max(widths.client_name,
                                strings.strdisplaywidth(entry.add.client_name))
                        end
                        return indexed_items, widths
                    end,
                    make_displayer = function(widths)
                        return entry_display.create {
                            separator = " ",
                            items = {
                                { width = widths.idx + 1 }, -- +1 for ":" suffix
                                { width = widths.command_title },
                                { width = widths.client_name },
                            },
                        }
                    end,
                    make_display = function(displayer)
                        return function(e)
                            return displayer {
                                { e.value.idx .. ":",       "TelescopePromptPrefix" },
                                { e.value.add.command_title },
                                { e.value.add.client_name,  "TelescopeResultsComment" },
                            }
                        end
                    end,
                    make_ordinal = function(e)
                        return e.idx .. e.add["command_title"]
                    end,
                },
            })
        )

        vim.ui.select = function(items, opts, on_choice)
            opts = opts or {}
            local prompt = vim.F.if_nil(opts.prompt, "Select one of")
            if prompt:sub(-1, -1) == ":" then
                prompt = prompt:sub(1, -2)
            end
            opts.format_item = vim.F.if_nil(opts.format_item, function(e)
                return tostring(e)
            end)

            -- We want or here because __TelescopeUISelectSpecificOpts[x] can be either nil or even false -> {}
            local sopts = __TelescopeUISelectSpecificOpts[vim.F.if_nil(opts.kind, "")] or {}
            local indexed_items, widths = vim.F.if_nil(sopts.make_indexed, function(items_)
                local indexed_items = {}
                for idx, item in ipairs(items_) do
                    table.insert(indexed_items, { idx = idx, text = item })
                end
                return indexed_items
            end)(items)
            local displayer = vim.F.if_nil(sopts.make_displayer, function()
            end)(widths)
            local make_display = vim.F.if_nil(sopts.make_display, function(_)
                return function(e)
                    local x, _ = opts.format_item(e.value.text)
                    return x
                end
            end)(displayer)
            local make_ordinal = vim.F.if_nil(sopts.make_ordinal, function(e)
                return opts.format_item(e.text)
            end)
            pickers.new(topts, {
                prompt_title = prompt,
                finder = finders.new_table {
                    results = indexed_items,
                    entry_maker = function(e)
                        return {
                            value = e,
                            display = make_display,
                            ordinal = make_ordinal(e),
                        }
                    end,
                },
                attach_mappings = function(prompt_bufnr)
                    actions.select_default:replace(function()
                        local selection = action_state.get_selected_entry()
                        if selection == nil then
                            utils.__warn_no_selection "ui-select"
                            return
                        end
                        actions.close(prompt_bufnr)
                        on_choice(selection.value.text, selection.value.idx)
                    end)
                    return true
                end,
                sorter = conf.generic_sorter(topts),
            }):find()
        end
    end,
}

local map = vim.api.nvim_set_keymap

map('n', '<Leader>pf', '<Cmd>Telescope find_files<CR>', { noremap = true })
map('n', '<Leader>pb', '<Cmd>Telescope buffers<CR>', { noremap = true })
map('n', '<Leader>po', '<Cmd>Telescope lsp_document_symbols<CR>', { noremap = true })
map('n', '<Leader>ps', '<Cmd>Telescope lsp_workspace_symbols<CR>', { noremap = true })
map('n', '<Leader>pd', '<Cmd>Telescope lsp_definitions<CR>', { noremap = true })
map('n', '<Leader>pr', '<Cmd>Telescope lsp_references<CR>', { noremap = true })
map('n', '<Leader>pp', '<C-^>', { noremap = true })
map('n', '<Leader>p', ':Telescope ', { noremap = true })
map('n', '<Leader>p ', ':Telescope ', { noremap = true })

map('n', '<Leader>.', ':lua vim.lsp.buf.code_action()<CR>', { noremap = true })
map('n', '<Leader>pn', '<Cmd>lua vim.lsp.buf.rename()<CR>', { noremap = true })

-- vim.cmd [[
-- 	function! s:telescope_hlsetup() abort
-- 		highlight link TelescopeBorder NonText
-- 		highlight link TelescopeTitle NonText
-- 	endfunction
-- 	call s:telescope_hlsetup()
-- 	augroup telescope_hlsetup
-- 		au!
-- 		au ColorScheme * call s:telescope_hlsetup()
-- 	augroup END
-- ]]