package repolist

import (
	"fmt"
	"os"
	"sort"
)

type RepoIterator struct {
	repos []*RepoRow
	index int
}

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

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

// Repo returns the current repo.
func (it *RepoIterator) Repo() *RepoRow {
	if it.repos[it.index-1] == nil {
		for i, d := range it.repos {
			fmt.Println("i =", i, d)
		}
		fmt.Println("len =", len(it.repos))
		fmt.Println("repo == nil", it.index, it.index-1)
		os.Exit(-1)
	}
	return it.repos[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 *RepoList) ReposAll() *RepoIterator {
	repoPointers := r.selectRepoAll()

	iterator := NewRepoIterator(repoPointers)

	return iterator
}

func (r *RepoList) ReposSortByName() *RepoIterator {
	repoPointers := r.selectRepoAll()

	sort.Sort(ByName(repoPointers))

	iterator := NewRepoIterator(repoPointers)

	return iterator
}

func (r *RepoList) UnmergedRepos() *RepoIterator {
	repoPointers := r.selectUnmergedRepos()

	sort.Sort(ByName(repoPointers))

	iterator := NewRepoIterator(repoPointers)

	return iterator
}

type ByName []*RepoRow

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

// SelectRepoPointers safely returns a slice of pointers to Repo records.
func (r *RepoList) selectRepoAll() []*RepoRow {
	r.RLock()
	defer r.RUnlock()

	// Create a new slice to hold pointers to each Repo
	// repoPointers := make([]*Repo, len(c.E.Repos))
	var repoPointers []*RepoRow
	for _, repo := range me.allrepos {
		if repo == nil {
			continue
		}
		if repo.Status == nil {
			continue
		}
		if !repo.Status.InitOk {
			continue
		}
		if repo.Status.Whitelist {
			continue
		}
		repoPointers = append(repoPointers, repo) // Copy pointers for safe iteration
	}

	return repoPointers
}

// this sort doesn't really work. I think it forgets to sort the last two
// todo: sort this out. literally
// SelectRepoPointers safely returns a slice of pointers to Repo records.
func (r *RepoList) selectUnmergedRepos() []*RepoRow {
	r.RLock()
	defer r.RUnlock()

	// Create a new slice to hold pointers to each Repo
	// repoPointers := make([]*Repo, len(c.E.Repos))
	var repoPointers []*RepoRow
	for _, repo := range me.allrepos {
		if repo == nil {
			continue
		}
		if repo.Status == nil {
			continue
		}
		if !repo.Status.InitOk {
			continue
		}
		if repo.ReadOnly() {
			continue
		}
		if repo.State() == "PERFECT" {
			continue
		}
		if repo.Status.Whitelist {
			continue
		}
		if repo.Status.IsReleased() {
			continue
		}
		repoPointers = append(repoPointers, repo) // Copy pointers for safe iteration
	}

	return repoPointers
}