package gitpb

// this is becoming a standard format
// todo: autogenerate this from the .proto file?

import (
	"fmt"
	"os"
	"sort"
	sync "sync"
	"time"
)

// bad global lock until I figure out some other plan
var refslock sync.RWMutex

type RefIterator struct {
	sync.RWMutex

	packs []*Ref
	index int
}

// NewRefIterator initializes a new iterator.
func NewRefIterator(packs []*Ref) *RefIterator {
	return &RefIterator{packs: packs}
}

// Scan moves to the next element and returns false if there are no more packs.
func (it *RefIterator) Scan() bool {
	if it.index >= len(it.packs) {
		return false
	}
	it.index++
	return true
}

// Ref returns the current repo.
func (it *RefIterator) Ref() *Ref {
	if it.packs[it.index-1] == nil {
		for i, d := range it.packs {
			fmt.Println("i =", i, d)
		}
		fmt.Println("len =", len(it.packs))
		fmt.Println("repo == nil", it.index, it.index-1)
		os.Exit(-1)
	}
	return it.packs[it.index-1]
}

// Use Scan() in a loop, similar to a while loop
//
//	for iterator.Scan() {
//		d := iterator.Ref()
//		fmt.Println("Ref UUID:", d.Uuid)
//	}

func (r *Repo) All() *RefIterator {
	repoPointers := r.selectAllRefs()

	iterator := NewRefIterator(repoPointers)
	return iterator
}

func (r *Repo) SortByName() *RefIterator {
	packs := r.selectAllRefs()

	sort.Sort(RefsByName(packs))

	iterator := NewRefIterator(packs)
	return iterator
}

// enforces no duplicate package names
func (repo *Repo) AppendRef(newP *Ref) bool {
	refslock.Lock()
	defer refslock.Unlock()

	for _, p := range repo.Refs {
		if p.RefName == newP.RefName {
			return false
		}
	}

	repo.Refs = append(repo.Refs, newP)
	return true
}

// returns time.Duration since last Update()
func (r *Ref) Age(newP *Ref) time.Duration {
	t := time.Since(r.Ctime.AsTime())
	return t
}

// find a package by name
func (repo *Repo) FindRefByName(name string) *Ref {
	refslock.RLock()
	defer refslock.RUnlock()

	for _, p := range repo.Refs {
		if p.RefName == name {
			return p
		}
	}

	return nil
}

func (repo *Repo) LenRefs() int {
	refslock.RLock()
	defer refslock.RUnlock()

	return len(repo.Refs)
}

type RefsByName []*Ref

func (a RefsByName) Len() int           { return len(a) }
func (a RefsByName) Less(i, j int) bool { return a[i].RefName < a[j].RefName }
func (a RefsByName) Swap(i, j int)      { a[i], a[j] = a[j], a[i] }

// safely returns a slice of pointers to the Ref protobufs
func (repo *Repo) selectAllRefs() []*Ref {
	refslock.RLock()
	defer refslock.RUnlock()

	// Create a new slice to hold pointers to each Ref
	var allRefs []*Ref
	allRefs = make([]*Ref, len(repo.Refs))
	for i, p := range repo.Refs {
		allRefs[i] = p // Copy pointers for safe iteration
	}

	return allRefs
}

func (repo *Repo) DeleteByHash(hash string) *Ref {
	refslock.Lock()
	defer refslock.Unlock()

	for i, _ := range repo.Refs {
		if repo.Refs[i].Hash == hash {
			repo.Refs[i] = repo.Refs[len(repo.Refs)-1]
			repo.Refs = repo.Refs[:len(repo.Refs)-1]
			return nil
		}
	}
	return nil
}