/*
Copyright 2011 Google Inc.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

     http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

// Gets the |p| query parameter, assuming that it looks like a blobref.

function getPermanodeParam() {
    var blobRef = getQueryParam('p');
    return (blobRef && isPlausibleBlobRef(blobRef)) ? blobRef : null;
}

function handleFormTitleSubmit(e) {
    e.stopPropagation();
    e.preventDefault();

    var inputTitle = document.getElementById("inputTitle");
    inputTitle.disabled = true;
    var btnSaveTitle = document.getElementById("btnSaveTitle");
    btnSaveTitle.disabled = true;

    var startTime = new Date();

    camliNewSetAttributeClaim(
        getPermanodeParam(),
        "title",
        inputTitle.value,
        {
            success: function() {
                var elapsedMs = new Date().getTime() - startTime.getTime();
                setTimeout(function() {
                    inputTitle.disabled = false;
                    btnSaveTitle.disabled = false;
                }, Math.max(250 - elapsedMs, 0));
            },
            fail: function(msg) {
                alert(msg);
                inputTitle.disabled = false;
                btnSaveTitle.disabled = false;
            }
        });
}

function handleFormTagsSubmit(e) {
    e.stopPropagation();
    e.preventDefault();

    var input = document.getElementById("inputNewTag");
    var btn = document.getElementById("btnAddTag");

    if (input.value == "") {
        return;
    }

    input.disabled = true;
    btn.disabled = true;

    var startTime = new Date();

    var tags = input.value.split(/\s*,\s*/);
    var nRemain = tags.length;

    var oneDone = function() {
        nRemain--;
        if (nRemain == 0) {
            var elapsedMs = new Date().getTime() - startTime.getTime();
            setTimeout(function() {
                           input.value = '';
                           input.disabled = false;
                           btn.disabled = false;
                           buildPermanodeUi();
                       }, Math.max(250 - elapsedMs, 0));
        }
    };
    for (idx in tags) {
        var tag = tags[idx];
        camliNewAddAttributeClaim(
            getPermanodeParam(),
            "tag",
            tag,
            {
                success: oneDone,
                fail: function(msg) {
                    alert(msg);
                    oneDone();
                }
            });
    }
}

function handleFormAccessSubmit(e) {
    e.stopPropagation();
    e.preventDefault();

    var selectAccess = document.getElementById("selectAccess");
    selectAccess.disabled = true;
    var btnSaveAccess = document.getElementById("btnSaveAccess");
    btnSaveAccess.disabled = true;

    var operation = camliNewDelAttributeClaim;
    var value = "";
    if (selectAccess.value != "private") {
        operation = camliNewSetAttributeClaim;
        value = selectAccess.value;
    }

    var startTime = new Date();

    operation(
        getPermanodeParam(),
        "camliAccess",
        value,
        {
            success: function() {
                var elapsedMs = new Date().getTime() - startTime.getTime();
                setTimeout(function() {
                    selectAccess.disabled = false;
                    btnSaveAccess.disabled = false;
                }, Math.max(250 - elapsedMs, 0));
            },
            fail: function(msg) {
                alert(msg);
                selectAccess.disabled = false;
                btnSaveAccess.disabled = false;
            }
        });
}

function deleteTagFunc(tag, strikeEle, removeEle) {
    return function(e) {
        strikeEle.innerHTML = "<del>" + strikeEle.innerHTML + "</del>";
        camliNewDelAttributeClaim(
            getPermanodeParam(),
            "tag",
            tag,
            {
                success: function() {
                    removeEle.parentNode.removeChild(removeEle);
                },
                fail: function(msg) {
                    alert(msg);
                }
            });
    };
}

function onTypeChange(e) {
    var sel = document.getElementById("type");
    var dnd = document.getElementById("dnd");

    if (sel.value == "collection" || sel.value == "") {
        dnd.style.display = "block";
    } else {
        dnd.style.display = "none";
    }
}

var lastFiles;
function handleFiles(files) {
    lastFiles = files;

    for (var i = 0; i < files.length; i++) {
        var file = files[i];
        startFileUpload(file);
    }
}

function startFileUpload(file) {
    var dnd = document.getElementById("dnd");
    var up = document.createElement("div");
    up.className= 'camli-dnd-item';
    dnd.appendChild(up);
    var info = "name=" + file.name + " size=" + file.size + "; type=" + file.type;

    var setStatus = function(status) {
        up.innerHTML = info + " " + status;
    };
    setStatus("(scanning)");

    var contentsRef; // set later

    var onFail = function(msg) {
        up.innerHTML = info + " <strong>fail:</strong> ";
        up.appendChild(document.createTextNode(msg));
    };

    var onGotFileSchemaRef = function(fileref) {
        setStatus(" <strong>fileref: " + fileref + "</strong>");
        camliCreateNewPermanode(
            {
            success: function(filepn) {
                var doneWithAll = function() {
                    setStatus("- done");
                    buildPermanodeUi();
                };
                var addMemberToParent = function() {
                    setStatus("adding member");
                    camliNewAddAttributeClaim(getPermanodeParam(), "camliMember", filepn, { success: doneWithAll, fail: onFail });
                };
                var makePermanode = function() {
                    setStatus("making permanode");
                    camliNewSetAttributeClaim(filepn, "camliContent", fileref, { success: addMemberToParent, fail: onFail });
                };
                makePermanode();
            },
            fail: onFail
        });
    };

    var fr = new FileReader();
    fr.onload = function() {
        dataurl = fr.result;
        comma = dataurl.indexOf(",");
        if (comma != -1) {
            b64 = dataurl.substring(comma + 1);
            var arrayBuffer = Base64.decode(b64).buffer;
            var hash = Crypto.SHA1(new Uint8Array(arrayBuffer, 0));

            contentsRef = "sha1-" + hash;
            setStatus("(checking for dup of " + contentsRef + ")");
            camliUploadFileHelper(file, contentsRef, {
              success: onGotFileSchemaRef, fail: onFail
            });
        }
    };
    fr.onerror = function() {
        console.log("FileReader onerror: " + fr.error + " code=" + fr.error.code);
    };
    fr.readAsDataURL(file);
}

function onFileFormSubmit(e) {
    e.stopPropagation();
    e.preventDefault();
    alert("TODO: upload");
}

function onFileInputChange(e) {
    handleFiles(document.getElementById("fileInput").files);
}

function setupFilesHandlers(e) {
    var dnd = document.getElementById("dnd");
    document.getElementById("fileForm").addEventListener("submit", onFileFormSubmit);
    document.getElementById("fileInput").addEventListener("change", onFileInputChange);

    var stop = function(e) {
        this.classList && this.classList.add('camli-dnd-over');
        e.stopPropagation();
        e.preventDefault();
    };
    dnd.addEventListener("dragenter", stop, false);
    dnd.addEventListener("dragover", stop, false);


    dnd.addEventListener("dragleave", function() {
            this.classList.remove('camli-dnd-over');
        }, false);

    var drop = function(e) {
        this.classList.remove('camli-dnd-over');
        stop(e);
        var dt = e.dataTransfer;
        var files = dt.files;
        document.getElementById("info").innerHTML = "";
        handleFiles(files);
    };
    dnd.addEventListener("drop", drop, false);
}


// member: child permanode
function deleteMember(member, strikeEle, removeEle) {
  return function(e) {
        strikeEle.innerHTML = "<del>" + strikeEle.innerHTML + "</del>";
        camliNewDelAttributeClaim(
            getPermanodeParam(),
            "camliMember",
            member,
            {
                success: function() {
                    removeEle.parentNode.removeChild(removeEle);
                },
                fail: function(msg) {
                    alert(msg);
                }
            });
    };
}

// pn: child permanode
// des: describe response of root permanode
function addMember(pn, des) {
    var membersDiv = document.getElementById("members");
    var ul;
    if (membersDiv.innerHTML == "") {
        membersDiv.appendChild(document.createTextNode("Members:"));
        ul = document.createElement("ul");
        membersDiv.appendChild(ul);
    } else {
        ul = membersDiv.firstChild.nextSibling;
    }
    var li = document.createElement("li");
    var a = document.createElement("a");
    a.href = "./?p=" + pn;
    a.innerText = camliBlobTitle(pn, des);

    var del = document.createElement("span");
    del.className = 'camli-del';
    del.innerText = "x";
    del.addEventListener("click", deleteMember(pn, a, li));

    li.appendChild(a);
    li.appendChild(del);
    ul.appendChild(li);
}

function buildPermanodeUi() {
    camliDescribeBlob(getPermanodeParam(), {
        success: onBlobDescribed,
        failure: function(msg) {
            alert("failed to get blob description: " + msg);
        }
    });
}

function onBlobDescribed(jres) {
    var permanode = getPermanodeParam();
    if (!jres[permanode]) {
        alert("didn't get blob " + permanode);
        return;
    }
    var permanodeObject = jres[permanode].permanode;
    if (!permanodeObject) {
        alert("blob " + permanode + " isn't a permanode");
        return;
    }

    var inputTitle = document.getElementById("inputTitle");
    inputTitle.value =
        (permanodeObject.attr.title && permanodeObject.attr.title.length == 1) ?
        permanodeObject.attr.title[0] :
        "";
    inputTitle.disabled = false;

    var spanTags = document.getElementById("spanTags");
    while (spanTags.firstChild) {
        spanTags.removeChild(spanTags.firstChild);
    }

    document.getElementById('members').innerHTML = '';
    var members = permanodeObject.attr.camliMember;
    if (members && members.length > 0) {
        for (idx in members) {
            var member = members[idx];
            addMember(member, jres);
        }
    }

    var camliContent = permanodeObject.attr.camliContent;
    if (camliContent && camliContent.length > 0) {
        camliContent = camliContent[camliContent.length-1];
        var c = document.getElementById("content");
        c.innerHTML = "";
        c.appendChild(document.createTextNode("Content: "));
        var a = document.createElement("a");
        a.href = "./?b=" + camliContent;
        a.innerText = camliBlobTitle(camliContent, jres);
        c.appendChild(a);
    }

    var tags = permanodeObject.attr.tag;
    for (idx in tags) {
        var tag = tags[idx];

        var tagSpan = document.createElement("span");
        tagSpan.className = 'camli-tag-c';
        var tagTextEl = document.createElement("span");
        tagTextEl.className = 'camli-tag-text';
        tagTextEl.innerText = tag;
        tagSpan.appendChild(tagTextEl);

        var tagDel = document.createElement("span");
        tagDel.className = 'camli-del';
        tagDel.innerText = "x";
        tagDel.addEventListener("click", deleteTagFunc(tag, tagTextEl, tagSpan));

        tagSpan.appendChild(tagDel);
        spanTags.appendChild(tagSpan);
    }

    var selectAccess = document.getElementById("selectAccess");
    var access = permanodeObject.attr.camliAccess;
    selectAccess.value = (access && access.length) ? access[0] : "private";
    selectAccess.disabled = false;

    var btnSaveTitle = document.getElementById("btnSaveTitle");
    btnSaveTitle.disabled = false;

    var btnSaveAccess = document.getElementById("btnSaveAccess");
    btnSaveAccess.disabled = false;
}

function handleFormUrlPathSubmit(e) {
    e.stopPropagation();
    e.preventDefault();

    var inputUrlPath = document.getElementById("inputUrlPath");
    if (!inputUrlPath.value) {
	alert("Please specify a mount path like '/foo/bar/stuff'");
	return;
    }

    // var btnSaveUrlPath = document.getElementById("btnSaveUrlPath");
    // btnSaveUrlPath.disabled = true;
    // btnSaveUrlPath.disabled = true;

    // TODO(bslatkin): Finish this function. Need to call
    // camliNewSetAttributeClaim() here with the root node for the
    // server specified as the target of the claim. See
    // lib/go/camli/search/search.go:FindPermanode for the general
    // approach for finding the root permanode by name.

    // camliNewSetAttributeClaim(
    //   getPermanodeParam(),
    //   "mount:" + inputUrlPath.value,
    //   ,
    //   {
    // 	  success: oneDone,
    // 	  fail: function(msg) {
    // 	      alert(msg);
    // 	      oneDone();
    // 	  }
    //   });
}

function setupUrlPathHandler() {
    var hostName = document.getElementById("urlHostName");
    hostName.innerHTML = window.location.host;
    var formUrlPath = document.getElementById("formUrlPath");
    formUrlPath.addEventListener("submit", handleFormUrlPathSubmit);
}

function permanodePageOnLoad(e) {
    var permanode = getPermanodeParam();
    if (permanode) {
        document.getElementById('permanode').innerHTML = "<a href='./?p=" + permanode + "'>" + permanode + "</a>";
        document.getElementById('permanodeBlob').innerHTML = "<a href='./?b=" + permanode + "'>view blob</a>";
    }

    var formTitle = document.getElementById("formTitle");
    formTitle.addEventListener("submit", handleFormTitleSubmit);
    var formTags = document.getElementById("formTags");
    formTags.addEventListener("submit", handleFormTagsSubmit);
    var formAccess = document.getElementById("formAccess");
    formAccess.addEventListener("submit", handleFormAccessSubmit);

    var selectType = document.getElementById("type");
    selectType.addEventListener("change", onTypeChange);

    setupFilesHandlers();

    buildPermanodeUi();

    setupUrlPathHandler();
}

window.addEventListener("load", permanodePageOnLoad);