// Copyright 2013-2023 The Cobra 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 cobra

import (
	"fmt"
	"strings"
)

// InvalidArgCountError is the error returned when the wrong number of arguments
// are supplied to a command.
type InvalidArgCountError struct {
	cmd     *Command
	args    []string
	atLeast int
	atMost  int
}

// Error implements error.
func (e *InvalidArgCountError) Error() string {
	if e.atMost == -1 && e.atLeast >= 0 { // MinimumNArgs
		return fmt.Sprintf("requires at least %d arg(s), only received %d", e.atLeast, len(e.args))
	}

	if e.atLeast == -1 && e.atMost >= 0 { // MaximumNArgs
		return fmt.Sprintf("accepts at most %d arg(s), received %d", e.atMost, len(e.args))
	}

	if e.atLeast == e.atMost && e.atLeast != -1 { // ExactArgs
		return fmt.Sprintf("accepts %d arg(s), received %d", e.atLeast, len(e.args))
	}

	// RangeArgs
	return fmt.Sprintf("accepts between %d and %d arg(s), received %d", e.atLeast, e.atMost, len(e.args))
}

// InvalidArgCountError is the error returned an invalid argument is present.
type InvalidArgValueError struct {
	cmd         *Command
	arg         string
	suggestions string
}

// Error implements error.
func (e *InvalidArgValueError) Error() string {
	return fmt.Sprintf("invalid argument %q for %q%s", e.arg, e.cmd.CommandPath(), e.suggestions)
}

// UnknownSubcommandError is the error returned when a subcommand can not be
// found.
type UnknownSubcommandError struct {
	cmd         *Command
	subcmd      string
	suggestions string
}

// Error implements error.
func (e *UnknownSubcommandError) Error() string {
	return fmt.Sprintf("unknown command %q for %q%s", e.subcmd, e.cmd.CommandPath(), e.suggestions)
}

// RequiredFlagError is the error returned when a required flag is not set.
type RequiredFlagError struct {
	missingFlagNames []string
}

// Error implements error.
func (e *RequiredFlagError) Error() string {
	return fmt.Sprintf(`required flag(s) "%s" not set`, strings.Join(e.missingFlagNames, `", "`))
}

// FlagGroupError is the error returned when mutually-required or
// mutually-exclusive flags are not properly specified.
type FlagGroupError struct {
	flagList      string
	flagGroupType flagGroupType
	problemFlags  []string
}

// flagGroupType identifies which failed validation caused a FlagGroupError.
type flagGroupType string

const (
	flagGroupIsExclusive   flagGroupType = "if any is set, none of the others can be"
	flagGroupIsRequired    flagGroupType = "if any is set, they must all be set"
	flagGroupIsOneRequired flagGroupType = "at least one of the flags is required"
)

// Error implements error.
func (e *FlagGroupError) Error() string {
	switch e.flagGroupType {
	case flagGroupIsRequired:
		return fmt.Sprintf("if any flags in the group [%v] are set they must all be set; missing %v", e.flagList, e.problemFlags)
	case flagGroupIsOneRequired:
		return fmt.Sprintf("at least one of the flags in the group [%v] is required", e.flagList)
	case flagGroupIsExclusive:
		return fmt.Sprintf("if any flags in the group [%v] are set none of the others can be; %v were all set", e.flagList, e.problemFlags)
	}

	panic("invalid flagGroupType")
}