// Copyright 2022 Harness Inc. All rights reserved.
// Use of this source code is governed by the Polyform Free Trial License
// that can be found in the LICENSE.md file for this repository.

package enum

import (
	"sort"
	"strings"
)

// PullReqState defines pull request state.
type PullReqState string

// PullReqState enumeration.
const (
	PullReqStateOpen     PullReqState = "open"
	PullReqStateMerged   PullReqState = "merged"
	PullReqStateClosed   PullReqState = "closed"
	PullReqStateRejected PullReqState = "rejected"
)

// PullReqSort defines pull request attribute that can be used for sorting.
type PullReqSort int

// PullReqAttr enumeration.
const (
	PullReqSortNone PullReqSort = iota
	PullReqSortNumber
	PullReqSortCreated
	PullReqSortUpdated
)

// ParsePullReqSort parses the pull request attribute string
// and returns the equivalent enumeration.
func ParsePullReqSort(s string) PullReqSort {
	switch strings.ToLower(s) {
	case number:
		return PullReqSortNumber
	case created, createdAt:
		return PullReqSortCreated
	case updated, updatedAt:
		return PullReqSortUpdated
	default:
		return PullReqSortNone
	}
}

// String returns the string representation of the attribute.
func (a PullReqSort) String() string {
	switch a {
	case PullReqSortNumber:
		return number
	case PullReqSortCreated:
		return created
	case PullReqSortUpdated:
		return updated
	case PullReqSortNone:
		return ""
	default:
		return undefined
	}
}

// PullReqActivityType defines pull request activity message type.
// Essentially, the Type determines the structure of the pull request activity's Payload structure.
type PullReqActivityType string

// PullReqActivityType enumeration.
const (
	PullReqActivityTypeComment     PullReqActivityType = "comment"
	PullReqActivityTypeCodeComment PullReqActivityType = "code-comment"
	PullReqActivityTypeTitleChange PullReqActivityType = "title-change"
)

var pullReqActivityTypes = []string{
	string(PullReqActivityTypeComment),
	string(PullReqActivityTypeCodeComment),
	string(PullReqActivityTypeTitleChange),
}

func init() {
	sort.Strings(pullReqActivityTypes)
}

// ParsePullReqActivityType parses the pull request activity type.
func ParsePullReqActivityType(s string) (PullReqActivityType, bool) {
	if existsInSortedSlice(pullReqActivityTypes, s) {
		return PullReqActivityType(s), true
	}
	return "", false
}

// PullReqActivityKind defines kind of pull request activity system message.
// Kind defines the source of the pull request activity entry:
// Whether it's generated by the system, it's a user comment or a part of code review.
type PullReqActivityKind string

// PullReqActivityKind enumeration.
const (
	PullReqActivityKindSystem      PullReqActivityKind = "system"
	PullReqActivityKindComment     PullReqActivityKind = "comment"
	PullReqActivityKindCodeComment PullReqActivityKind = "code"
)

var pullReqActivityKinds = []string{
	string(PullReqActivityKindSystem),
	string(PullReqActivityKindComment),
	string(PullReqActivityTypeCodeComment),
}

func init() {
	sort.Strings(pullReqActivityKinds)
}

// ParsePullReqActivityKind parses the pull request activity type.
func ParsePullReqActivityKind(s string) (PullReqActivityKind, bool) {
	if existsInSortedSlice(pullReqActivityKinds, s) {
		return PullReqActivityKind(s), true
	}
	return "", false
}

func existsInSortedSlice(strs []string, s string) bool {
	idx := sort.SearchStrings(strs, s)
	return idx >= 0 && idx < len(strs) && strs[idx] == s
}