/**
 * 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_settings
 */

var util = require("util");
var runtime;

function extend(target, source) {
    var keys = Object.keys(source);
    var i = keys.length;
    while(i--) {
        var value = source[keys[i]]
        var type = typeof value;
        if (type === 'string' || type === 'number' || type === 'boolean' || Array.isArray(value)) {
            target[keys[i]] = value;
        } else if (value === null) {
            if (target.hasOwnProperty(keys[i])) {
                delete target[keys[i]];
            }
        } else {
            // Object
            if (target.hasOwnProperty(keys[i])) {
                // Target property exists. Need to handle the case
                // where the existing property is a string/number/boolean
                // and is being replaced wholesale.
                var targetType = typeof target[keys[i]];
                if (targetType === 'string' || targetType === 'number' || targetType === 'boolean') {
                    target[keys[i]] = value;
                } else {
                    target[keys[i]] = extend(target[keys[i]],value);
                }
            } else {
                target[keys[i]] = value;
            }
        }
    }
    return target;
}

function getSSHKeyUsername(userObj) {
    var username = '__default';
    if ( userObj && userObj.username ) {
        username = userObj.username;
    }
    return username;
}
var api = module.exports = {
    init: function(_runtime) {
        runtime = _runtime;
    },
    /**
    * Gets the runtime settings object
    * @param {Object} opts
    * @param {User} opts.user - the user calling the api
    * @param {Object} opts.req - the request to log (optional)
    * @return {Promise<Object>} - the runtime settings
    * @memberof @node-red/runtime_settings
    */
    getRuntimeSettings: async function(opts) {
        var safeSettings = {
            httpNodeRoot: runtime.settings.httpNodeRoot||"/",
            version: runtime.settings.version
        }
        if (opts.user) {
            safeSettings.user = {}
            var props = ["anonymous","username","image","permissions"];
            props.forEach(prop => {
                if (opts.user.hasOwnProperty(prop)) {
                    safeSettings.user[prop] = opts.user[prop];
                }
            })
        }

        if (!runtime.settings.disableEditor) {
            safeSettings.context = runtime.nodes.listContextStores();
            if (runtime.settings.editorTheme) {
                if (runtime.settings.editorTheme.codeEditor) {
                    safeSettings.codeEditor = runtime.settings.editorTheme.codeEditor || {};
                    safeSettings.codeEditor.lib = safeSettings.codeEditor.lib || "monaco";
                    safeSettings.codeEditor.options = safeSettings.codeEditor.options || {};
                }
                if (runtime.settings.editorTheme.markdownEditor) {
                    safeSettings.markdownEditor = runtime.settings.editorTheme.markdownEditor || {};
                    safeSettings.markdownEditor.mermaid = safeSettings.markdownEditor.mermaid || { enabled: true };
                }
                if (runtime.settings.editorTheme.mermaid) {
                    safeSettings.mermaid = runtime.settings.editorTheme.mermaid
                }
            }
            safeSettings.libraries = runtime.library.getLibraries();
            if (Array.isArray(runtime.settings.paletteCategories)) {
                safeSettings.paletteCategories = runtime.settings.paletteCategories;
            }

            if (runtime.settings.flowFilePretty) {
                safeSettings.flowFilePretty = runtime.settings.flowFilePretty;
            }

            if (runtime.settings.editorTheme && runtime.settings.editorTheme.palette) {
                if (runtime.settings.editorTheme.palette.upload === false || runtime.settings.editorTheme.palette.editable === false) {
                    safeSettings.externalModules = {palette: { } }
                }
                if (runtime.settings.editorTheme.palette.upload === false) {
                    safeSettings.externalModules.palette.allowUpload = false;
                }
                if (runtime.settings.editorTheme.palette.editable === false) {
                    safeSettings.externalModules.palette.allowInstall = false;
                    safeSettings.externalModules.palette.allowUpload = false;
                }
            }

            if (runtime.settings.externalModules) {
                safeSettings.externalModules = extend(safeSettings.externalModules||{},runtime.settings.externalModules);
            }

            if (!runtime.nodes.installerEnabled()) {
                safeSettings.externalModules = safeSettings.externalModules || {};
                safeSettings.externalModules.palette = safeSettings.externalModules.palette || {};
                safeSettings.externalModules.palette.allowInstall = false;
                safeSettings.externalModules.palette.allowUpload = false;
            }
            if (runtime.storage.projects) {
                var activeProject = runtime.storage.projects.getActiveProject();
                if (activeProject) {
                    safeSettings.project = activeProject;
                } else if (runtime.storage.projects.flowFileExists()) {
                    safeSettings.files = {
                        flow: runtime.storage.projects.getFlowFilename(),
                        credentials: runtime.storage.projects.getCredentialsFilename()
                    }
                }
                safeSettings.git = {
                    globalUser: runtime.storage.projects.getGlobalGitUser()
                }
            }

            safeSettings.flowEncryptionType = runtime.nodes.getCredentialKeyType();

            safeSettings.diagnostics = {
                //unless diagnostics.ui and diagnostics.enabled are explicitly false, they will default to true.
                enabled: (runtime.settings.diagnostics && runtime.settings.diagnostics.enabled === false) ? false : true,
                ui: (runtime.settings.diagnostics && runtime.settings.diagnostics.ui === false) ? false : true
            }
            if(safeSettings.diagnostics.enabled === false) {
                safeSettings.diagnostics.ui = false; // cannot have UI without endpoint
            }

            safeSettings.runtimeState = {
                //unless runtimeState.ui and runtimeState.enabled are explicitly true, they will default to false.
                enabled: !!runtime.settings.runtimeState && runtime.settings.runtimeState.enabled === true,
                ui: !!runtime.settings.runtimeState && runtime.settings.runtimeState.ui === true
            }
            if(safeSettings.runtimeState.enabled !== true) {
                safeSettings.runtimeState.ui = false; // cannot have UI without endpoint
            }

            runtime.settings.exportNodeSettings(safeSettings);
            runtime.plugins.exportPluginSettings(safeSettings);
        }

        return safeSettings;
    },

    /**
    * Gets an individual user's settings object
    * @param {Object} opts
    * @param {User} opts.user - the user calling the api
    * @param {Object} opts.req - the request to log (optional)
    * @return {Promise<Object>} - the user settings
    * @memberof @node-red/runtime_settings
    */
    getUserSettings: async function(opts) {
        var username;
        if (!opts.user || opts.user.anonymous) {
            username = '_';
        } else {
            username = opts.user.username;
        }
        return runtime.settings.getUserSettings(username)||{};
    },

    /**
    * Updates an individual user's settings object.
    * @param {Object} opts
    * @param {User} opts.user - the user calling the api
    * @param {Object} opts.settings - the updates to the user settings
    * @param {Object} opts.req - the request to log (optional)
    * @return {Promise<Object>} - the user settings
    * @memberof @node-red/runtime_settings
    */
    updateUserSettings: async function(opts) {
        var username;
        if (!opts.user || opts.user.anonymous) {
            username = '_';
        } else {
            username = opts.user.username;
        }
        var currentSettings = runtime.settings.getUserSettings(username)||{};
        currentSettings = extend(currentSettings, opts.settings);
        try {
            return runtime.settings.setUserSettings(username, currentSettings).then(function() {
                runtime.log.audit({event: "settings.update",username:username}, opts.req);
                return;
            }).catch(function(err) {
                runtime.log.audit({event: "settings.update",username:username,error:err.code||"unexpected_error",message:err.toString()}, opts.req);
                err.status = 400;
                throw err;
            });
        } catch(err) {
            runtime.log.warn(runtime.log._("settings.user-not-available",{message:runtime.log._("settings.not-available")}));
            runtime.log.audit({event: "settings.update",username:username,error:err.code||"unexpected_error",message:err.toString()}, opts.req);
            err.status = 400;
            throw err;
        }
    },

    /**
    * Gets a list of a user's ssh keys
    * @param {Object} opts
    * @param {User} opts.user - the user calling the api
    * @param {Object} opts.req - the request to log (optional)
    * @return {Promise<Object>} - the user's ssh keys
    * @memberof @node-red/runtime_settings
    */
    getUserKeys: async function(opts) {
        var username = getSSHKeyUsername(opts.user);
        return runtime.storage.projects.ssh.listSSHKeys(username).catch(function(err) {
            err.status = 400;
            throw err;
            return reject(err);
        });
    },

    /**
    * Gets a user's ssh public key
    * @param {Object} opts
    * @param {User} opts.user - the user calling the api
    * @param {User} opts.id - the id of the key to return
    * @param {Object} opts.req - the request to log (optional)
    * @return {Promise<String>} - the user's ssh public key
    * @memberof @node-red/runtime_settings
    */
    getUserKey: async function(opts) {
        var username = getSSHKeyUsername(opts.user);
        // console.log('username:', username);
        return runtime.storage.projects.ssh.getSSHKey(username, opts.id).then(function(data) {
            if (data) {
                return data;
            } else {
                var err = new Error("Key not found");
                err.code = "not_found";
                err.status = 404;
                throw err;
            }
        }).catch(function(err) {
            if (!err.status) {
                err.status = 400;
            }
            throw err;
        });
    },

    /**
    * Generates a new ssh key pair
    * @param {Object} opts
    * @param {User} opts.user - the user calling the api
    * @param {User} opts.name - the id of the key to return
    * @param {User} opts.password - (optional) the password for the key pair
    * @param {User} opts.comment - (option) a comment to associate with the key pair
    * @param {User} opts.size - (optional) the size of the key. Default: 2048
    * @param {Object} opts.req - the request to log (optional)
    * @return {Promise<String>} - the id of the generated key
    * @memberof @node-red/runtime_settings
    */
    generateUserKey: async function(opts) {
        var username = getSSHKeyUsername(opts.user);
        return runtime.storage.projects.ssh.generateSSHKey(username, opts).catch(function(err) {
            err.status = 400;
            throw err;
        });
    },

    /**
    * Deletes a user's ssh key pair
    * @param {Object} opts
    * @param {User} opts.user - the user calling the api
    * @param {User} opts.id - the id of the key to delete
    * @param {Object} opts.req - the request to log (optional)
    * @return {Promise} - resolves when deleted
    * @memberof @node-red/runtime_settings
    */
    removeUserKey: async function(opts) {
        var username = getSSHKeyUsername(opts.user);
        return runtime.storage.projects.ssh.deleteSSHKey(username, opts.id).catch(function(err) {
            err.status = 400;
            throw err;
        });
    }
}
