Bank : Singleton {
    classvar <>root, <>extensions, <>lazyLoading=true;
    var <paths, buffers,
    <channels, <foundRoot,
    <foundRootModTime, 
    markersCache, atCache;
    var metadata;

    *initClass {
        root = "/Users/bubo/.config/livecoding/samples".standardizePath;
        extensions = ["wav", "aiff", "aif", "flac", "ogg"];
    }

    *list {
      PathName(Bank.root).entries.do({
      arg item; item.folderName.postln;
      })
    }

    *contains {
      arg sample;
      var folderNames = PathName(Bank.root).entries.collect({
        arg item;
        if (item.folderName == sample) {
          ^true
        }
      });
      ^false;
    }

    *new {
        |path, channels|
        ^super.new(path, channels);
    }

    size {
        ^paths.size
    }

    printOn {
        |stream|
        super.printOn(stream);
        stream << "[%]".format(paths.size)
    }

    init {
        var currentRoot, currentExtensions, foundPaths=[], attempts = List();
        var fixedName;

        buffers = [];
        ServerQuit.add(this);
        ServerBoot.add(this);

        fixedName = name.asString
            .replace("[", "\\[")
            .replace("]", "\\]")
            .replace("(", "\\(")
            .replace(")", "\\)");

        if (foundRootModTime.notNil) {
            if (foundRoot.notNil and: { File.exists(foundRoot) } and: { File.mtime(foundRoot) == foundRootModTime }) {
                ^this; // no changes, so early return!
            }
        };

        currentExtensions = this.class.extensions;
        currentRoot = thisProcess.nowExecutingPath;

        // Try an absolute path resolve first
        foundPaths = Require.resolvePaths(fixedName, [], currentExtensions, attempts);
        if (foundPaths.isEmpty.not) {
            currentRoot = PathName(fixedName).parentPath;
        } {
            if (currentRoot.notNil) {
                currentRoot = PathName(currentRoot).parentPath;
                foundPaths = Require.resolvePaths(fixedName, currentRoot, currentExtensions, attempts);
            };

            if (foundPaths.isEmpty and: { currentRoot.notNil }) {
                currentRoot = currentRoot +/+ fixedName.asString;
                foundPaths = Require.resolvePaths("*", currentRoot, currentExtensions, attempts);
            };

            if (foundPaths.isEmpty) {
                currentRoot = this.class.root;
                foundPaths = Require.resolvePaths(fixedName, currentRoot, currentExtensions, attempts);
            };

            if (foundPaths.isEmpty) {
                currentRoot = currentRoot +/+ fixedName;
                foundPaths = Require.resolvePaths("*", currentRoot, currentExtensions, attempts);
            };
        };

        if (foundPaths.isEmpty) {
            foundRoot = nil;
            foundRootModTime = nil;
            "No samples found, attempted paths: ".warn;
            attempts.do {
                |a|
                "\t%.{%}".format(a, currentExtensions.join(",")).warn
            };
        } {
            foundRoot = currentRoot;
            foundRootModTime = File.mtime(foundRoot) ?? {0};
        };

        foundPaths = foundPaths.sort({
            |a, b|
            var pair;
            #a, b = [a, b].collect {
                |p|
                p = p.toLower;
                p = p.split($.).first;
                p = p.split($/).reverse;
            };
            pair = [a, b].flop.detect({
                |pair|
                pair[0] != pair[1]
            });
            pair !? {
                pair[0] < pair[1]
            } ?? { false }
        });

        atCache = ();
        paths = foundPaths;
        this.metadata;
    }

    prGetMetadata {
        ^paths.collect {
            |path|
            SoundFile.openRead(path) !? {
                |sf|
                var e = (
                    sampleRate:     sf.sampleRate,
                    numChannels:    sf.numChannels,
                    numFrames:      sf.numFrames,
                    sampleFormat:   sf.sampleFormat,
                    headerFormat:   sf.headerFormat,
                );
                sf.close;
                e
            };
        }
    }

    metadata {
        |key|
        metadata = metadata ?? this.prGetMetadata(_);
        if (key.isNil) {
            ^metadata
        } {
            ^metadata[this.indexForKey(key)]
        }
    }

    lazyLoading_{
        |lazy|
        if (lazyLoading != lazy) {
            lazyLoading = lazy;
            this.prUpdateBuffers();
        }
    }

    buffers {
        ^paths.size.collect {
            |i|
            this.bufferAt(i)
        }
    }

    gui {
        var view, sampleViews, button, name;
        var playNode;

        this.lazyLoading = false;

        view = View().layout_(GridLayout.rows());
        paths.do {
            |path, i|
            var sampleView;
            name = PathName(path).fileNameWithoutExtension;
            view.layout.add(
                sampleView = DragSource()
                    .object_("%(%)[%]".format(
                        this.class.name,
                        channels !? {
                            "'%', %".format(this.name, channels)
                        } ?? {
                            "'%'".format(this.name)
                        },
                        name.quote
                    ))
                    .string_(name)
                    .canFocus_(true)
                    .font_(Font("M+ 2c", 10, false))
                    .minWidth_(100)
                    .mouseDownAction_({
                        |v|
                        if (v.focus) {
                            playNode.free;
                            playNode = this.bufferAt(i).play
                        }
                    })
                    .focusGainedAction_({ this.bufferAt(i).play(mul:[1, 1]) }),
                (i / 4).floor,
                i % 4
            );
            sampleViews = sampleViews.add(sampleView);
        };

        view.keyUpAction = {
            |view, char, modifiers, unicode, keycode, key|
            switch(
                keycode.postln,
                123, {
                    sampleViews[-1 + (sampleViews.detectIndex({ |v| v.hasFocus }) ? 0)].focus
                },
                124, {
                    sampleViews[ 1 + (sampleViews.detectIndex({ |v| v.hasFocus }) ? 0)].focus
                },
                125, {
                    sampleViews[ 4 + (sampleViews.detectIndex({ |v| v.hasFocus }) ? 0)].focus
                },
                126, {
                    sampleViews[-4 + (sampleViews.detectIndex({ |v| v.hasFocus }) ? 0)].focus
                }
            )
        };

        ScrollView(bounds:500@600).canvas_(view).front;
    }

    set {
        |inChannels|
        if (channels != inChannels) {
            channels = inChannels;
            this.clear();
            this.prUpdateBuffers();
        };
    }

    clear {
        paths = [];
        atCache = ();
        this.prUpdateBuffers();
    }

    bufferAt {
        |index|
        var sf;
        ^buffers !? {
            buffers[index] ?? {
                if (Server.default.serverRunning) {
                    buffers = buffers.extend(index + 1, nil);
                    if (channels.isNil) {
                        buffers[index] = Buffer.read(Server.default, paths[index]);
                        buffers[index].numChannels = metadata[index][\numChannels];      
                        buffers[index];
                    } {
                        buffers[index] = Buffer.readChannel(Server.default, paths[index], channels:Array.series(channels));
                    };
                };

                buffers[index];
            }
        }
    }

    indexForKey {
        |key|
        var index;

        if (key.isArray && key.isString.not) {
            ^key.collect(this.at(_))
        };

        if (key.isInteger) {
            index = key
        } {
            index = atCache[key.asSymbol];
            if (index.isNil) {
                index = paths.detectIndex({
                    |path|
                    key.asString.toLower.replace("*", ".*").matchRegexp(
                        path.asString.toLower
                    );
                });
                atCache[key.asSymbol] = index;
            }
        };

        ^index
    }

    at {
        |key|
        ^this.bufferAt(this.indexForKey(key));
    }

    markers {
        ^markersCache ?? {
            markersCache = paths.collect({
                |path|
                SoundFile(path).extractMarkers
            })
        }
    }

    wrapAt {
        |index|
        if (index.isInteger) {
            index = index % buffers.size;
        };
        ^this.at(index);
    }

    do 			{ |...args| buffers.size.collect(this.bufferAt(_)).do(*args) }
    collect 	{ |...args| ^buffers.size.collect(this.bufferAt(_)).collect(*args) }

    prUpdateBuffers {
        if (Server.default.serverBooting or: {
            Server.default.hasBooted && Server.default.serverRunning.not
        }) {
            Server.default.doWhenBooted {
                this.prUpdateBuffers();
            };
            ^this;
        };

        if (Server.default.serverRunning.not) {
            buffers = [];
        } {
            if (paths.size > buffers.size) { buffers = buffers.extend(paths.size) };

            paths.do {
                |path, i|
                var buffer;

                buffer = buffers[i];

                if (path.notNil) {
                    if (lazyLoading.not) {
                        this.bufferAt(i)
                    }
                } {
                    if (buffer.notNil) {
                        buffer.free;
                        buffers[i] = buffer = nil;
                    }
                }
            };

            buffers[paths.size..].do {
                |b|
                b.free;
            };
            buffers.extend(paths.size);
        }
    }

    doOnServerBoot {
        if (paths.size > 0) {
            buffers = [];
            this.prUpdateBuffers();
            "***Loaded samples for %***".format(this.asString).postln;
        }
    }

    doOnServerQuit {
        buffers = [];
    }

    pat {
        |keyPat|
        ^Pindex(Pseq([this], inf), keyPat)
    }

    // Single buffer support
    asBuffer 		{ 				^this.singleSampleWrap(nil) }
    asControlInput  { |...args| 	^this.prSingleSampleWrap(\asControlInput, *args) }
    play 			{ |...args| 	^this.prSingleSampleWrap(\play, *args) }

    prSingleSampleWrap {
        |method ...args|
        var buffer;
        if (buffers.size == 1) {
            buffer = this.bufferAt(0);

            if (method.isNil) {
                ^buffer
            } {
                if (buffer.numFrames.isNil) {
                    fork {
                        Server.default.sync;
                        buffer.performList(method, args)
                    };
                    ^nil;
                } {
                    ^buffer.performList(method, args)
                }
            }
        } {
            Error("Trying to % a SAMP with multiple buffers".format(method)).throw;
        }
    }
}