/**
 * Copyright JS Foundation and other contributors, http://js.foundation
 *
 * 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.
 **/

/**
 * @mixin @node-red/runtime_nodes
 */

var fs = require("fs-extra");

var runtime;

function putNode(node, enabled) {
    var info;
    var promise;
    if (!node.err && node.enabled === enabled) {
        promise = Promise.resolve(node);
    } else {
        if (enabled) {
            promise = runtime.nodes.enableNode(node.id);
        } else {
            promise = runtime.nodes.disableNode(node.id);
        }
    }
    return promise;
}

var api = module.exports = {
    init: function(_runtime) {
        runtime = _runtime;
    },


    /**
    * Gets the info of an individual node set
    * @param {Object} opts
    * @param {User} opts.user - the user calling the api
    * @param {String} opts.id - the id of the node set to return
    * @param {Object} opts.req - the request to log (optional)
    * @return {Promise<NodeInfo>} - the node information
    * @memberof @node-red/runtime_nodes
    */
    getNodeInfo: async function(opts) {
        var id = opts.id;
        var result = runtime.nodes.getNodeInfo(id);
        if (result) {
            runtime.log.audit({event: "nodes.info.get",id:id}, opts.req);
            delete result.loaded;
            return result;
        } else {
            runtime.log.audit({event: "nodes.info.get",id:id,error:"not_found"}, opts.req);
            var err = new Error("Node not found");
            err.code = "not_found";
            err.status = 404;
            throw err;
        }
    },

    /**
    * Gets the list of node modules installed in the runtime
    * @param {Object} opts
    * @param {User} opts.user - the user calling the api
    * @param {Object} opts.req - the request to log (optional)
    * @return {Promise<NodeList>} - the list of node modules
    * @memberof @node-red/runtime_nodes
    */
    getNodeList: async function(opts) {
        runtime.log.audit({event: "nodes.list.get"}, opts.req);
        return runtime.nodes.getNodeList();
    },

    /**
    * Gets an individual node's html content
    * @param {Object} opts
    * @param {User} opts.user - the user calling the api
    * @param {String} opts.id - the id of the node set to return
    * @param {String} opts.lang - the locale language to return
    * @param {Object} opts.req - the request to log (optional)
    * @return {Promise<String>} - the node html content
    * @memberof @node-red/runtime_nodes
    */
    getNodeConfig: async function(opts) {
        var id = opts.id;
        var lang = opts.lang;
        if (/[^0-9a-z=\-\*]/i.test(opts.lang)) {
            reject(new Error("Invalid language: "+opts.lang));
            return
        }
        var result = runtime.nodes.getNodeConfig(id,lang);
        if (result) {
            runtime.log.audit({event: "nodes.config.get",id:id}, opts.req);
            return result;
        } else {
            runtime.log.audit({event: "nodes.config.get",id:id,error:"not_found"}, opts.req);
            var err = new Error("Node not found");
            err.code = "not_found";
            err.status = 404;
            throw err;
        }
    },
    /**
    * Gets all node html content
    * @param {Object} opts
    * @param {User} opts.user - the user calling the api
    * @param {String} opts.lang - the locale language to return
    * @param {Object} opts.req - the request to log (optional)
    * @return {Promise<String>} - the node html content
    * @memberof @node-red/runtime_nodes
    */
    getNodeConfigs: async function(opts) {
        runtime.log.audit({event: "nodes.configs.get"}, opts.req);
        if (/[^0-9a-z=\-\*]/i.test(opts.lang)) {
            reject(new Error("Invalid language: "+opts.lang));
            return
        }
        return runtime.nodes.getNodeConfigs(opts.lang);
    },

    /**
    * Gets the info of a node module
    * @param {Object} opts
    * @param {User} opts.user - the user calling the api
    * @param {String} opts.module - the id of the module to return
    * @param {Object} opts.req - the request to log (optional)
    * @return {Promise<ModuleInfo>} - the node module info
    * @memberof @node-red/runtime_nodes
    */
    getModuleInfo: async function(opts) {
        var result = runtime.nodes.getModuleInfo(opts.module);
        if (result) {
            runtime.log.audit({event: "nodes.module.get",id:opts.module}, opts.req);
            return result;
        } else {
            runtime.log.audit({event: "nodes.module.get",id:opts.module,error:"not_found"}, opts.req);
            var err = new Error("Module not found");
            err.code = "not_found";
            err.status = 404;
            throw err;
        }
    },

    /**
    * Install a new module into the runtime
    * @param {Object} opts
    * @param {User} opts.user - the user calling the api
    * @param {String} opts.module - the id of the module to install
    * @param {String} opts.version - (optional) the version of the module to install
    * @param {Object} opts.tarball - (optional) a tarball file to install. Object has properties `name`, `size` and `buffer`.
    * @param {String} opts.url - (optional) url to install
    * @param {Object} opts.req - the request to log (optional)
    * @return {Promise<ModuleInfo>} - the node module info
    * @memberof @node-red/runtime_nodes
    */
    addModule: async function(opts) {
        if (!runtime.settings.available()) {
            runtime.log.audit({event: "nodes.install",error:"settings_unavailable"}, opts.req);
            var err = new Error("Settings unavailable");
            err.code = "settings_unavailable";
            err.status = 400;
            throw err;
        }
        if (opts.tarball) {
            if (runtime.settings.externalModules && runtime.settings.externalModules.palette && runtime.settings.externalModules.palette.upload === false) {
                runtime.log.audit({event: "nodes.install",tarball:opts.tarball.file,error:"invalid_request"}, opts.req);
                var err = new Error("Invalid request");
                err.code = "invalid_request";
                err.status = 400;
                throw err;
            }
            if (opts.module || opts.version || opts.url) {
                runtime.log.audit({event: "nodes.install",tarball:opts.tarball.file,module:opts.module,error:"invalid_request"}, opts.req);
                var err = new Error("Invalid request");
                err.code = "invalid_request";
                err.status = 400;
                throw err;
            }
            return runtime.nodes.installModule(opts.tarball.buffer).then(function(info) {
                runtime.log.audit({event: "nodes.install",tarball:opts.tarball.file,module:info.id}, opts.req);
                return info;
            }).catch(function(err) {
                if (err.code) {
                    err.status = 400;
                    runtime.log.audit({event: "nodes.install",module:opts.module,version:opts.version,url:opts.url,error:err.code}, opts.req);
                } else {
                    err.status = 400;
                    runtime.log.audit({event: "nodes.install",module:opts.module,version:opts.version,url:opts.url,error:err.code||"unexpected_error",message:err.toString()}, opts.req);
                }
                throw err;
            })
        }
        if (opts.module) {
            var existingModule = runtime.nodes.getModuleInfo(opts.module);
            if (existingModule && existingModule.user) {
                if (!opts.version || existingModule.version === opts.version) {
                    runtime.log.audit({event: "nodes.install",module:opts.module, version:opts.version, error:"module_already_loaded"}, opts.req);
                    var err = new Error("Module already loaded");
                    err.code = "module_already_loaded";
                    err.status = 400;
                    throw err;
                }
            }
            return runtime.nodes.installModule(opts.module,opts.version,opts.url).then(function(info) {
                runtime.log.audit({event: "nodes.install",module:opts.module,version:opts.version,url:opts.url}, opts.req);
                return info;
            }).catch(function(err) {
                if (err.code === 404) {
                    runtime.log.audit({event: "nodes.install",module:opts.module,version:opts.version,url:opts.url,error:"not_found"}, opts.req);
                    // TODO: code/status
                    err.status = 404;
                } else if (err.code) {
                    err.status = 400;
                    runtime.log.audit({event: "nodes.install",module:opts.module,version:opts.version,url:opts.url,error:err.code}, opts.req);
                } else {
                    err.status = 400;
                    runtime.log.audit({event: "nodes.install",module:opts.module,version:opts.version,url:opts.url,error:err.code||"unexpected_error",message:err.toString()}, opts.req);
                }
                throw err;
            })
        } else {
            runtime.log.audit({event: "nodes.install",module:opts.module,error:"invalid_request"}, opts.req);
            var err = new Error("Invalid request");
            err.code = "invalid_request";
            err.status = 400;
            throw err;
        }
    },
    /**
    * Removes a module from the runtime
    * @param {Object} opts
    * @param {User} opts.user - the user calling the api
    * @param {String} opts.module - the id of the module to remove
    * @param {Object} opts.req - the request to log (optional)
    * @return {Promise} - resolves when complete
    * @memberof @node-red/runtime_nodes
    */
    removeModule: async function(opts) {
        if (!runtime.settings.available()) {
            runtime.log.audit({event: "nodes.install",error:"settings_unavailable"}, opts.req);
            var err = new Error("Settings unavailable");
            err.code = "settings_unavailable";
            err.status = 400;
            throw err;
        }
        var module = runtime.nodes.getModuleInfo(opts.module);
        if (!module) {
            runtime.log.audit({event: "nodes.remove",module:opts.module,error:"not_found"}, opts.req);
            var err = new Error("Module not found");
            err.code = "not_found";
            err.status = 404;
            throw err;
        }
        try {
            return runtime.nodes.uninstallModule(opts.module).then(function() {
                runtime.log.audit({event: "nodes.remove",module:opts.module}, opts.req);
            }).catch(function(err) {
                err.status = 400;
                runtime.log.audit({event: "nodes.remove",module:opts.module,error:err.code||"unexpected_error",message:err.toString()}, opts.req);
                throw err;
            })
        } catch(error) {
            runtime.log.audit({event: "nodes.remove",module:opts.module,error:error.code||"unexpected_error",message:error.toString()}, opts.req);
            error.status = 400;
            throw err;
        }
    },

    /**
    * Enables or disables a module in the runtime
    * @param {Object} opts
    * @param {User} opts.user - the user calling the api
    * @param {String} opts.module - the id of the module to enable or disable
    * @param {String} opts.enabled - whether the module should be enabled or disabled
    * @param {Object} opts.req - the request to log (optional)
    * @return {Promise<ModuleInfo>} - the module info object
    * @memberof @node-red/runtime_nodes
    */
    setModuleState: async function(opts) {
        var mod = opts.module;
        if (!runtime.settings.available()) {
            runtime.log.audit({event: "nodes.module.set",error:"settings_unavailable"}, opts.req);
            var err = new Error("Settings unavailable");
            err.code = "settings_unavailable";
            err.status = 400;
            throw err;
        }
        try {
            var module = runtime.nodes.getModuleInfo(mod);
            if (!module) {
                runtime.log.audit({event: "nodes.module.set",module:mod,error:"not_found"}, opts.req);
                var err = new Error("Module not found");
                err.code = "not_found";
                err.status = 404;
                throw err;
            }

            var nodes = module.nodes;
            var promises = [];
            for (var i = 0; i < nodes.length; ++i) {
                promises.push(putNode(nodes[i],opts.enabled));
            }
            return Promise.all(promises).then(function() {
                return runtime.nodes.getModuleInfo(mod);
            }).catch(function(err) {
                err.status = 400;
                throw err;
            });
        } catch(error) {
            runtime.log.audit({event: "nodes.module.set",module:mod,enabled:opts.enabled,error:error.code||"unexpected_error",message:error.toString()}, opts.req);
            error.status = 400;
            throw err;
        }
    },

    /**
    * Enables or disables a n individual node-set in the runtime
    * @param {Object} opts
    * @param {User} opts.user - the user calling the api
    * @param {String} opts.id - the id of the node-set to enable or disable
    * @param {String} opts.enabled - whether the module should be enabled or disabled
    * @param {Object} opts.req - the request to log (optional)
    * @return {Promise<ModuleInfo>} - the module info object
    * @memberof @node-red/runtime_nodes
    */
    setNodeSetState: async function(opts) {
        if (!runtime.settings.available()) {
            runtime.log.audit({event: "nodes.info.set",error:"settings_unavailable"}, opts.req);
            var err = new Error("Settings unavailable");
            err.code = "settings_unavailable";
            err.status = 400;
            throw err;
        }

        var id = opts.id;
        var enabled = opts.enabled;
        try {
            var node = runtime.nodes.getNodeInfo(id);
            if (!node) {
                runtime.log.audit({event: "nodes.info.set",id:id,error:"not_found"}, opts.req);
                var err = new Error("Node not found");
                err.code = "not_found";
                err.status = 404;
                throw err;
            } else {
                delete node.loaded;
                return putNode(node,enabled).then(function(result) {
                    runtime.log.audit({event: "nodes.info.set",id:id,enabled:enabled}, opts.req);
                    return result;
                }).catch(function(err) {
                    runtime.log.audit({event: "nodes.info.set",id:id,enabled:enabled,error:err.code||"unexpected_error",message:err.toString()}, opts.req);
                    err.status = 400;
                    throw err;
                });
            }
        } catch(error) {
            runtime.log.audit({event: "nodes.info.set",id:id,enabled:enabled,error:error.code||"unexpected_error",message:error.toString()}, opts.req);
            error.status = 400;
            throw err;
        }
    },

    /**
    * Gets all registered module message catalogs
    * @param {Object} opts
    * @param {User} opts.user - the user calling the api
    * @param {User} opts.lang - the i18n language to return. If not set, uses runtime default (en-US)
    * @param {Object} opts.req - the request to log (optional)
    * @return {Promise<Object>} - the message catalogs
    * @memberof @node-red/runtime_nodes
    */
    getModuleCatalogs: async function(opts) {
        var namespace = opts.module;
        var lang = opts.lang;
        if (/[^0-9a-z=\-\*]/i.test(lang)) {
            reject(new Error("Invalid language: "+lang));
            return
        }
        var prevLang = runtime.i18n.i.language;
        // Trigger a load from disk of the language if it is not the default
        return new Promise( (resolve,reject) => {
            runtime.i18n.i.changeLanguage(lang, function(){
                var nodeList = runtime.nodes.getNodeList();
                var result = {};
                nodeList.forEach(function(n) {
                    if (n.module !== "node-red") {
                        result[n.id] = runtime.i18n.i.getResourceBundle(lang, n.id)||{};
                    }
                });
                runtime.i18n.i.changeLanguage(prevLang);
                resolve(result);
            });
        });
    },

    /**
    * Gets a modules message catalog
    * @param {Object} opts
    * @param {User} opts.user - the user calling the api
    * @param {User} opts.module - the module
    * @param {User} opts.lang - the i18n language to return. If not set, uses runtime default (en-US)
    * @param {Object} opts.req - the request to log (optional)
    * @return {Promise<Object>} - the message catalog
    * @memberof @node-red/runtime_nodes
    */
    getModuleCatalog: async function(opts) {
        var namespace = opts.module;
        var lang = opts.lang;
        if (/[^0-9a-z=\-\*]/i.test(lang)) {
            reject(new Error("Invalid language: "+lang));
            return
        }
        var prevLang = runtime.i18n.i.language;
        // Trigger a load from disk of the language if it is not the default
        return new Promise(resolve => {
            runtime.i18n.i.changeLanguage(lang, function() {
                var catalog = runtime.i18n.i.getResourceBundle(lang, namespace);
                runtime.i18n.i.changeLanguage(prevLang);
                resolve(catalog||{});
            });
        });
    },

    /**
    * Gets the list of all icons available in the modules installed within the runtime
    * @param {Object} opts
    * @param {User} opts.user - the user calling the api
    * @param {Object} opts.req - the request to log (optional)
    * @return {Promise<IconList>} - the list of all icons
    * @memberof @node-red/runtime_nodes
    */
    getIconList: async function(opts) {
        runtime.log.audit({event: "nodes.icons.get"}, opts.req);
        return runtime.nodes.getNodeIcons();
    },
    /**
    * Gets a node icon
    * @param {Object} opts
    * @param {User} opts.user - the user calling the api
    * @param {String} opts.module - the id of the module requesting the icon
    * @param {String} opts.icon - the name of the icon
    * @param {Object} opts.req - the request to log (optional)
    * @return {Promise<Buffer>} - the icon file as a Buffer or null if no icon available
    * @memberof @node-red/runtime_nodes
    */
    getIcon: async function(opts) {
        var iconPath = runtime.nodes.getNodeIconPath(opts.module,opts.icon);
        if (iconPath) {
            return fs.readFile(iconPath).catch(err => {
                err.status = 400;
                throw err;
            });
        } else {
            return null
        }
    },

    /**
    * Gets a resource from a module
    * @param {Object} opts
    * @param {User} opts.user - the user calling the api
    * @param {String} opts.module - the id of the module requesting the resource
    * @param {String} opts.path - the path of the resource
    * @param {Object} opts.req - the request to log (optional)
    * @return {Promise<Buffer>} - the resource file as a Buffer or null if not found
    * @memberof @node-red/runtime_nodes
    */
    getModuleResource: async function(opts) {
        var resourcePath = runtime.nodes.getModuleResource(opts.module, opts.path);
        if (resourcePath) {
            return fs.readFile(resourcePath).catch(err => {
                if (err.code === 'EISDIR') {
                    return null;
                }
                err.status = 400;
                throw err;
            });
        } else {
            return null
        }
    }
}