(function () {
    function authHeaders() {
        return {
            token: localStorage.getItem('token') || ''
        };
    }

    function isForbidden(res) {
        return res && Number(res.code) === 403;
    }

    function isOk(res) {
        return res && (Number(res.code) === 200 || Number(res.code) === 0);
    }

    function normalizeId(value) {
        if (value === null || value === undefined || value === '') {
            return null;
        }
        var numberValue = Number(value);
        return isNaN(numberValue) ? value : numberValue;
    }

    function normalizeNumber(value, fallback) {
        if (value === null || value === undefined || value === '') {
            return fallback;
        }
        var numberValue = Number(value);
        return isNaN(numberValue) ? fallback : numberValue;
    }

    function cloneRow(row) {
        return {
            id: normalizeId(row.id),
            code: row.code || '',
            name: row.name || '',
            resourceId: normalizeId(row.resourceId),
            level: normalizeNumber(row.level, 1),
            sort: normalizeNumber(row.sort, 999),
            status: normalizeNumber(row.status, 1)
        };
    }

    function createDefaultForm() {
        return {
            id: null,
            resourceId: null,
            code: '',
            level: 1,
            name: '',
            sort: 999,
            status: 1
        };
    }

    function sortNodes(nodes) {
        nodes.sort(function (left, right) {
            var sortDiff = normalizeNumber(left.sort, 999) - normalizeNumber(right.sort, 999);
            if (sortDiff !== 0) {
                return sortDiff;
            }
            return String(left.id).localeCompare(String(right.id), 'zh-Hans-CN', {numeric: true});
        });
        nodes.forEach(function (node) {
            if (node.children && node.children.length > 0) {
                sortNodes(node.children);
            }
        });
        return nodes;
    }

    function buildTree(rows) {
        var nodeMap = {};
        var roots = [];

        rows.forEach(function (item) {
            var node = cloneRow(item);
            node.children = [];
            nodeMap[node.id] = node;
        });

        Object.keys(nodeMap).forEach(function (key) {
            var current = nodeMap[key];
            if (current.resourceId !== null && nodeMap[current.resourceId] && current.resourceId !== current.id) {
                nodeMap[current.resourceId].children.push(current);
            } else {
                roots.push(current);
            }
        });

        return sortNodes(roots);
    }

    new Vue({
        el: '#app',
        data: function () {
            var vm = this;
            return {
                loading: false,
                tableData: [],
                tableKey: 0,
                tableHeight: Math.max(window.innerHeight - 198, 360),
                expandAll: false,
                selection: [],
                flatRows: [],
                resourceLookup: {},
                childrenLookup: {},
                editingId: null,
                dialog: {
                    visible: false,
                    mode: 'create',
                    submitting: false
                },
                dialogForm: createDefaultForm(),
                parentCascaderProps: {
                    checkStrictly: true,
                    emitPath: false,
                    value: 'id',
                    label: 'name',
                    children: 'children'
                },
                dialogRules: {
                    code: [
                        {required: true, message: '请输入菜单编码', trigger: 'blur'}
                    ],
                    name: [
                        {required: true, message: '请输入菜单名称', trigger: 'blur'}
                    ],
                    level: [
                        {required: true, message: '请选择类型', trigger: 'change'}
                    ],
                    resourceId: [
                        {
                            validator: function (rule, value, callback) {
                                if (Number(vm.dialogForm.level) > 1 && (value === null || value === undefined || value === '')) {
                                    callback(new Error('请选择上级菜单'));
                                    return;
                                }
                                callback();
                            },
                            trigger: 'change'
                        }
                    ],
                    sort: [
                        {type: 'number', message: '排序必须为数字', trigger: 'blur'}
                    ],
                    status: [
                        {required: true, message: '请选择状态', trigger: 'change'}
                    ]
                }
            };
        },
        computed: {
            parentOptions: function () {
                var blocked = {};
                if (this.editingId !== null) {
                    blocked = this.collectDescendantIds(this.editingId);
                }
                return this.buildParentOptions(this.tableData, blocked);
            }
        },
        created: function () {
            this.loadTree();
        },
        mounted: function () {
            window.addEventListener('resize', this.handleResize);
        },
        beforeDestroy: function () {
            window.removeEventListener('resize', this.handleResize);
        },
        methods: {
            createDefaultForm: function () {
                return createDefaultForm();
            },
            handleResize: function () {
                this.tableHeight = Math.max(window.innerHeight - 198, 360);
                this.refreshTableLayout();
            },
            handleForbidden: function (res) {
                if (isForbidden(res)) {
                    top.location.href = baseUrl + '/';
                    return true;
                }
                return false;
            },
            refreshTableLayout: function () {
                var vm = this;
                this.$nextTick(function () {
                    if (vm.$refs.treeTable && vm.$refs.treeTable.doLayout) {
                        vm.$refs.treeTable.doLayout();
                    }
                });
            },
            rebuildIndexes: function (rows) {
                var lookup = {};
                var childrenLookup = {};

                rows.forEach(function (item) {
                    var normalized = cloneRow(item);
                    lookup[normalized.id] = normalized;
                    if (normalized.resourceId !== null) {
                        if (!childrenLookup[normalized.resourceId]) {
                            childrenLookup[normalized.resourceId] = [];
                        }
                        childrenLookup[normalized.resourceId].push(normalized.id);
                    }
                });

                this.flatRows = rows.map(function (item) {
                    return cloneRow(item);
                });
                this.resourceLookup = lookup;
                this.childrenLookup = childrenLookup;
            },
            loadTree: function () {
                var vm = this;
                vm.loading = true;
                $.ajax({
                    url: baseUrl + '/resource/tree/auth',
                    method: 'GET',
                    headers: authHeaders(),
                    success: function (res) {
                        vm.loading = false;
                        if (vm.handleForbidden(res)) {
                            return;
                        }
                        if (!isOk(res)) {
                            vm.$message.error(res && res.msg ? res.msg : '菜单加载失败');
                            return;
                        }
                        var rows = Array.isArray(res.data) ? res.data : [];
                        vm.rebuildIndexes(rows);
                        vm.tableData = buildTree(rows);
                        vm.selection = [];
                        vm.tableKey += 1;
                        vm.refreshTableLayout();
                    },
                    error: function () {
                        vm.loading = false;
                        vm.$message.error('菜单加载失败');
                    }
                });
            },
            handleSelectionChange: function (rows) {
                this.selection = rows || [];
            },
            toggleExpandAll: function () {
                this.expandAll = !this.expandAll;
                this.tableKey += 1;
                this.refreshTableLayout();
            },
            levelText: function (level) {
                var currentLevel = Number(level);
                if (currentLevel === 1) {
                    return '一级菜单';
                }
                if (currentLevel === 2) {
                    return '二级菜单';
                }
                if (currentLevel === 3) {
                    return '按钮';
                }
                return '--';
            },
            levelTagType: function (level) {
                var currentLevel = Number(level);
                if (currentLevel === 3) {
                    return 'info';
                }
                if (currentLevel === 2) {
                    return '';
                }
                return 'success';
            },
            parentName: function (resourceId) {
                if (resourceId === null || resourceId === undefined || resourceId === '') {
                    return '';
                }
                var parent = this.resourceLookup[normalizeId(resourceId)];
                return parent ? parent.name : '';
            },
            collectDescendantIds: function (resourceId) {
                var blocked = {};
                var stack = [normalizeId(resourceId)];
                while (stack.length > 0) {
                    var currentId = stack.pop();
                    if (currentId === null || blocked[currentId]) {
                        continue;
                    }
                    blocked[currentId] = true;
                    var childIds = this.childrenLookup[currentId] || [];
                    childIds.forEach(function (childId) {
                        stack.push(childId);
                    });
                }
                return blocked;
            },
            buildParentOptions: function (nodes, blocked) {
                var vm = this;
                return (nodes || []).reduce(function (result, node) {
                    if (blocked[node.id]) {
                        return result;
                    }
                    var option = {
                        id: node.id,
                        name: node.name,
                        children: vm.buildParentOptions(node.children || [], blocked)
                    };
                    if (option.children.length === 0) {
                        delete option.children;
                    }
                    result.push(option);
                    return result;
                }, []);
            },
            resetDialogForm: function () {
                this.editingId = null;
                this.dialogForm = this.createDefaultForm();
                var vm = this;
                this.$nextTick(function () {
                    if (vm.$refs.dialogForm) {
                        vm.$refs.dialogForm.clearValidate();
                    }
                });
            },
            openCreateDialog: function () {
                this.dialog.mode = 'create';
                this.dialog.visible = true;
                this.resetDialogForm();
            },
            openEditDialog: function (row) {
                this.dialog.mode = 'edit';
                this.dialog.visible = true;
                this.editingId = normalizeId(row.id);
                this.dialogForm = {
                    id: normalizeId(row.id),
                    resourceId: normalizeId(row.resourceId),
                    code: row.code || '',
                    level: normalizeNumber(row.level, 1),
                    name: row.name || '',
                    sort: normalizeNumber(row.sort, 999),
                    status: normalizeNumber(row.status, 1)
                };
                var vm = this;
                this.$nextTick(function () {
                    if (vm.$refs.dialogForm) {
                        vm.$refs.dialogForm.clearValidate();
                    }
                });
            },
            removeSelection: function () {
                if (!this.selection.length) {
                    this.$message.warning('请选择要删除的数据');
                    return;
                }
                var ids = this.selection.map(function (row) {
                    return normalizeId(row.id);
                }).filter(function (id) {
                    return id !== null;
                });
                this.removeRows(ids);
            },
            removeRows: function (ids) {
                var vm = this;
                var uniqueIds = Array.from(new Set((ids || []).map(function (id) {
                    return normalizeId(id);
                }).filter(function (id) {
                    return id !== null;
                })));
                if (!uniqueIds.length) {
                    vm.$message.warning('请选择要删除的数据');
                    return;
                }
                vm.$confirm('确定要删除选中数据吗？', '提示', {
                    confirmButtonText: '确定',
                    cancelButtonText: '取消',
                    type: 'warning'
                }).then(function () {
                    $.ajax({
                        url: baseUrl + '/resource/delete/auth',
                        method: 'POST',
                        headers: authHeaders(),
                        traditional: true,
                        data: {
                            ids: uniqueIds
                        },
                        success: function (res) {
                            if (vm.handleForbidden(res)) {
                                return;
                            }
                            if (!isOk(res)) {
                                vm.$message.error(res && res.msg ? res.msg : '删除失败');
                                return;
                            }
                            vm.$message.success(res.msg || '删除成功');
                            vm.loadTree();
                        },
                        error: function () {
                            vm.$message.error('删除失败');
                        }
                    });
                }).catch(function () {
                });
            },
            submitDialog: function () {
                var vm = this;
                if (!vm.$refs.dialogForm) {
                    return;
                }
                vm.$refs.dialogForm.validate(function (valid) {
                    if (!valid) {
                        return false;
                    }
                    var payload = {
                        id: vm.dialog.mode === 'edit' ? normalizeId(vm.dialogForm.id) : null,
                        resourceId: Number(vm.dialogForm.level) === 1 ? null : normalizeId(vm.dialogForm.resourceId),
                        code: $.trim(vm.dialogForm.code),
                        level: normalizeNumber(vm.dialogForm.level, 1),
                        name: $.trim(vm.dialogForm.name),
                        sort: normalizeNumber(vm.dialogForm.sort, 999),
                        status: normalizeNumber(vm.dialogForm.status, 1)
                    };
                    vm.dialog.submitting = true;
                    $.ajax({
                        url: baseUrl + '/resource/' + (vm.dialog.mode === 'create' ? 'add' : 'update') + '/auth',
                        method: 'POST',
                        headers: authHeaders(),
                        data: payload,
                        success: function (res) {
                            vm.dialog.submitting = false;
                            if (vm.handleForbidden(res)) {
                                return;
                            }
                            if (!isOk(res)) {
                                vm.$message.error(res && res.msg ? res.msg : '保存失败');
                                return;
                            }
                            vm.$message.success(res.msg || '保存成功');
                            vm.dialog.visible = false;
                            vm.loadTree();
                        },
                        error: function () {
                            vm.dialog.submitting = false;
                            vm.$message.error('保存失败');
                        }
                    });
                    return true;
                });
            }
        },
        watch: {
            'dialogForm.level': function (value) {
                if (Number(value) === 1) {
                    this.dialogForm.resourceId = null;
                }
            },
            'dialog.visible': function (visible) {
                if (!visible) {
                    this.resetDialogForm();
                    this.dialog.submitting = false;
                }
            }
        }
    });
})();