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// Copyright 2017 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 keystore

import (
    "io/ioutil"
    "os"
    "path/filepath"
    "strings"
    "sync"
    "time"

    mapset "github.com/deckarep/golang-set"
    "github.com/dexon-foundation/dexon/log"
)

// fileCache is a cache of files seen during scan of keystore.
type fileCache struct {
    all     mapset.Set // Set of all files from the keystore folder
    lastMod time.Time  // Last time instance when a file was modified
    mu      sync.RWMutex
}

// scan performs a new scan on the given directory, compares against the already
// cached filenames, and returns file sets: creates, deletes, updates.
func (fc *fileCache) scan(keyDir string) (mapset.Set, mapset.Set, mapset.Set, error) {
    t0 := time.Now()

    // List all the failes from the keystore folder
    files, err := ioutil.ReadDir(keyDir)
    if err != nil {
        return nil, nil, nil, err
    }
    t1 := time.Now()

    fc.mu.Lock()
    defer fc.mu.Unlock()

    // Iterate all the files and gather their metadata
    all := mapset.NewThreadUnsafeSet()
    mods := mapset.NewThreadUnsafeSet()

    var newLastMod time.Time
    for _, fi := range files {
        path := filepath.Join(keyDir, fi.Name())
        // Skip any non-key files from the folder
        if nonKeyFile(fi) {
            log.Trace("Ignoring file on account scan", "path", path)
            continue
        }
        // Gather the set of all and fresly modified files
        all.Add(path)

        modified := fi.ModTime()
        if modified.After(fc.lastMod) {
            mods.Add(path)
        }
        if modified.After(newLastMod) {
            newLastMod = modified
        }
    }
    t2 := time.Now()

    // Update the tracked files and return the three sets
    deletes := fc.all.Difference(all)   // Deletes = previous - current
    creates := all.Difference(fc.all)   // Creates = current - previous
    updates := mods.Difference(creates) // Updates = modified - creates

    fc.all, fc.lastMod = all, newLastMod
    t3 := time.Now()

    // Report on the scanning stats and return
    log.Debug("FS scan times", "list", t1.Sub(t0), "set", t2.Sub(t1), "diff", t3.Sub(t2))
    return creates, deletes, updates, nil
}

// nonKeyFile ignores editor backups, hidden files and folders/symlinks.
func nonKeyFile(fi os.FileInfo) bool {
    // Skip editor backups and UNIX-style hidden files.
    if strings.HasSuffix(fi.Name(), "~") || strings.HasPrefix(fi.Name(), ".") {
        return true
    }
    // Skip misc special files, directories (yes, symlinks too).
    if fi.IsDir() || fi.Mode()&os.ModeType != 0 {
        return true
    }
    return false
}