// Copyright 2023 Woodpecker 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 utils

// MergeSlices return a new slice that combines all values of input slices
// TODO: once https://github.com/golang/go/pull/61817 got merged, we should switch to it
func MergeSlices[T any](slices ...[]T) []T {
	sl := 0
	for i := range slices {
		sl += len(slices[i])
	}
	result := make([]T, sl)
	cp := 0
	for _, s := range slices {
		if sLen := len(s); sLen != 0 {
			copy(result[cp:], s)
			cp += sLen
		}
	}
	return result
}

// EqualSliceValues compare two slices if they have equal values independent of how they are sorted.
func EqualSliceValues[E comparable](s1, s2 []E) bool {
	if len(s1) != len(s2) {
		return false
	}

	m1 := sliceToCountMap(s1)
	m2 := sliceToCountMap(s2)

	for k, v := range m1 {
		if m2[k] != v {
			return false
		}
	}

	return true
}

func sliceToCountMap[E comparable](list []E) map[E]int {
	m := make(map[E]int)
	for i := range list {
		m[list[i]]++
	}
	return m
}

// SliceToBoolMap is a helper function to convert a string slice to a map.
func SliceToBoolMap(s []string) map[string]bool {
	v := map[string]bool{}
	for _, ss := range s {
		if ss == "" {
			continue
		}
		v[ss] = true
	}
	return v
}

// StringSliceDeleteEmpty removes empty strings from a string slice.
func StringSliceDeleteEmpty(s []string) []string {
	r := make([]string, 0)
	for _, str := range s {
		if str != "" {
			r = append(r, str)
		}
	}
	return r
}