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// Copyright 2016 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.

package storage

import (
    "bytes"
    "crypto/rand"
    "fmt"
    "io"
    "sync"
    "testing"

    "github.com/ethereum/go-ethereum/log"
)

type brokenLimitedReader struct {
    lr    io.Reader
    errAt int
    off   int
    size  int
}

func brokenLimitReader(data io.Reader, size int, errAt int) *brokenLimitedReader {
    return &brokenLimitedReader{
        lr:    data,
        errAt: errAt,
        size:  size,
    }
}

func testDataReader(l int) (r io.Reader) {
    return io.LimitReader(rand.Reader, int64(l))
}

func (self *brokenLimitedReader) Read(buf []byte) (int, error) {
    if self.off+len(buf) > self.errAt {
        return 0, fmt.Errorf("Broken reader")
    }
    self.off += len(buf)
    return self.lr.Read(buf)
}

func testDataReaderAndSlice(l int) (r io.Reader, slice []byte) {
    slice = make([]byte, l)
    if _, err := rand.Read(slice); err != nil {
        panic("rand error")
    }
    r = io.LimitReader(bytes.NewReader(slice), int64(l))
    return
}

func testStore(m ChunkStore, l int64, branches int64, t *testing.T) {

    chunkC := make(chan *Chunk)
    go func() {
        for chunk := range chunkC {
            m.Put(chunk)
            if chunk.wg != nil {
                chunk.wg.Done()
            }
        }
    }()
    chunker := NewTreeChunker(&ChunkerParams{
        Branches: branches,
        Hash:     SHA3Hash,
    })
    swg := &sync.WaitGroup{}
    key, _ := chunker.Split(rand.Reader, l, chunkC, swg, nil)
    swg.Wait()
    close(chunkC)
    chunkC = make(chan *Chunk)

    quit := make(chan bool)

    go func() {
        for ch := range chunkC {
            go func(chunk *Chunk) {
                storedChunk, err := m.Get(chunk.Key)
                if err == notFound {
                    log.Trace(fmt.Sprintf("chunk '%v' not found", chunk.Key.Log()))
                } else if err != nil {
                    log.Trace(fmt.Sprintf("error retrieving chunk %v: %v", chunk.Key.Log(), err))
                } else {
                    chunk.SData = storedChunk.SData
                    chunk.Size = storedChunk.Size
                }
                log.Trace(fmt.Sprintf("chunk '%v' not found", chunk.Key.Log()))
                close(chunk.C)
            }(ch)
        }
        close(quit)
    }()
    r := chunker.Join(key, chunkC)

    b := make([]byte, l)
    n, err := r.ReadAt(b, 0)
    if err != io.EOF {
        t.Fatalf("read error (%v/%v) %v", n, l, err)
    }
    close(chunkC)
    <-quit
}