package fzf

import (

"fmt"
"testing"

"github.com/junegunn/fzf/src/util"

)

func TestChunkList(t *testing.T) {

// FIXME global
sortCriteria = []criterion{byScore, byLength}

cl := NewChunkList(func(item *Item, s []byte) bool {
        item.text = util.ToChars(s)
        return true
})

// Snapshot
snapshot, count := cl.Snapshot()
if len(snapshot) > 0 || count > 0 {
        t.Error("Snapshot should be empty now")
}

// Add some data
cl.Push([]byte("hello"))
cl.Push([]byte("world"))

// Previously created snapshot should remain the same
if len(snapshot) > 0 {
        t.Error("Snapshot should not have changed")
}

// But the new snapshot should contain the added items
snapshot, count = cl.Snapshot()
if len(snapshot) != 1 && count != 2 {
        t.Error("Snapshot should not be empty now")
}

// Check the content of the ChunkList
chunk1 := snapshot[0]
if chunk1.count != 2 {
        t.Error("Snapshot should contain only two items")
}
if chunk1.items[0].text.ToString() != "hello" ||
        chunk1.items[1].text.ToString() != "world" {
        t.Error("Invalid data")
}
if chunk1.IsFull() {
        t.Error("Chunk should not have been marked full yet")
}

// Add more data
for i := 0; i < chunkSize*2; i++ {
        cl.Push([]byte(fmt.Sprintf("item %d", i)))
}

// Previous snapshot should remain the same
if len(snapshot) != 1 {
        t.Error("Snapshot should stay the same")
}

// New snapshot
snapshot, count = cl.Snapshot()
if len(snapshot) != 3 || !snapshot[0].IsFull() ||
        !snapshot[1].IsFull() || snapshot[2].IsFull() || count != chunkSize*2+2 {
        t.Error("Expected two full chunks and one more chunk")
}
if snapshot[2].count != 2 {
        t.Error("Unexpected number of items")
}

cl.Push([]byte("hello"))
cl.Push([]byte("world"))

lastChunkCount := snapshot[len(snapshot)-1].count
if lastChunkCount != 2 {
        t.Error("Unexpected number of items:", lastChunkCount)
}

}