/*
 * Copyright 2018 The NATS Authors
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package cliprompts

import (
	"fmt"
	"strings"
)

type TestPrompts struct {
	count  int
	inputs []interface{}
}

func NewTestPrompts(inputs []interface{}) PromptLib {
	return &TestPrompts{
		count:  0,
		inputs: inputs,
	}
}

func (t *TestPrompts) logInputs(kind string, label string, value interface{}) {
	if LogFn == nil {
		return
	}
	LogFn(fmt.Sprintf("[%s %d] %s = %v\n", kind, t.count, label, value))
}

func (t *TestPrompts) Prompt(label string, value string, edit bool, validator Validator) (string, error) {
	t.logInputs("prompt", label, t.inputs[t.count])
	return t.prompt(label, value, edit, validator)
}

func (t *TestPrompts) PromptWithHelp(label string, value string, edit bool, validator Validator, help string) (string, error) {
	t.logInputs("promptWithHelp", label, t.inputs[t.count])
	return t.prompt(label, value, edit, validator)
}

func (t *TestPrompts) PromptYN(m string, defaultValue bool) (bool, error) {
	t.logInputs("yn", m, t.inputs[t.count])
	val := t.inputs[t.count].(bool)
	t.count = t.count + 1
	return val, nil
}

func (t *TestPrompts) PromptSecret(m string) (string, error) {
	t.logInputs("secret", m, t.inputs[t.count])
	val := t.inputs[t.count].(string)
	t.count = t.count + 1
	return val, nil
}

func (t *TestPrompts) PromptChoices(m string, value string, choices []string) (int, error) {
	t.logInputs("choices", m, fmt.Sprintf("[%s]", strings.Join(choices, ",\n\t")))
	val := t.inputs[t.count].(int)
	t.logInputs("choices", "   selection", fmt.Sprintf("%d (%s)", val, choices[val]))
	t.count = t.count + 1
	return val, nil
}

func (t *TestPrompts) PromptMultipleChoices(m string, choices []string) ([]int, error) {
	t.logInputs("multiple-choice", m, t.inputs[t.count])
	val := t.inputs[t.count].([]int)
	t.count = t.count + 1
	return val, nil
}

func (t *TestPrompts) prompt(label string, value string, edit bool, validator Validator) (string, error) {
	val, ok := t.inputs[t.count].(string)
	if !ok {
		val = fmt.Sprintf("%v", val)
	}
	t.count = t.count + 1

	if validator != nil {
		err := validator(val)
		if err != nil {
			return Prompt(label, value, edit, validator)
		}
	}
	return val, nil
}