package forgepb

// TODO: autogen this? (probably not feasible. need go-arglike tricks in proto)

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

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

type RepoIterator struct {
	sync.RWMutex

	packs []*Repo
	index int
}

// NewRepoIterator initializes a new iterator.
func NewRepoIterator(packs []*Repo) *RepoIterator {
	return &RepoIterator{packs: packs}
}

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

// Repo returns the current repo.
func (it *RepoIterator) Repo() *Repo {
	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.Repo()
//		fmt.Println("Repo UUID:", d.Uuid)
//	}

func (r *Repos) All() *RepoIterator {
	repoPointers := r.selectAllRepos()

	iterator := NewRepoIterator(repoPointers)
	return iterator
}

func (r *Repos) SortByPath() *RepoIterator {
	packs := r.selectAllRepos()

	sort.Sort(ByRepoPath(packs))

	iterator := NewRepoIterator(packs)
	return iterator
}

// enforces no duplicate repo paths
func (r *Repos) Append(newP *Repo) bool {
	reposLock.Lock()
	defer reposLock.Unlock()

	for _, p := range r.Repos {
		if p.GoPath == newP.GoPath {
			return false
		}
	}

	r.Repos = append(r.Repos, newP)
	return true
}

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

// find a repo by path
func (r *Repos) FindByPath(gopath string) *Repo {
	reposLock.RLock()
	defer reposLock.RUnlock()

	for _, p := range r.Repos {
		if p.GoPath == gopath {
			return p
		}
	}

	return nil
}

func (r *Repos) Len() int {
	reposLock.RLock()
	defer reposLock.RUnlock()

	return len(r.Repos)
}

type ByRepoPath []*Repo

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

func (all *Repos) DeleteByPath(gopath string) *Repo {
	reposLock.Lock()
	defer reposLock.Unlock()

	var newr Repo

	for i, _ := range all.Repos {
		if all.Repos[i].GoPath == gopath {
			newr = *all.Repos[i]
			all.Repos[i] = all.Repos[len(all.Repos)-1]
			all.Repos = all.Repos[:len(all.Repos)-1]
			return &newr
		}
	}
	return nil
}

// safely returns a slice of pointers to the Repo protobufs
func (r *Repos) selectAllRepos() []*Repo {
	reposLock.RLock()
	defer reposLock.RUnlock()

	// Create a new slice to hold pointers to each Repo
	var allPacks []*Repo
	allPacks = make([]*Repo, len(r.Repos))
	for i, p := range r.Repos {
		allPacks[i] = p // Copy pointers for safe iteration
	}

	return allPacks
}