const { FreepbxGqlClient, gql } = require("freepbx-graphql-client");

class FreepbxManager {
	/**
	 * Creates an instance of the FreepbxGqlClient and initializes the connection pool.
	 * 
	 * @param {Object} config - Configuration object for the FreepbxGqlClient.
	 * @param {string} config.url - The URL of the FreePBX GraphQL endpoint.
	 * @param {string} config.clientId - The client ID for authentication.
	 * @param {string} config.clientSecret - The client secret for authentication.
	 * @param {Object} config.dbPool - The connection pool for managing database connections.
	 */
    constructor(config) {
        this.client = new FreepbxGqlClient(config.url, {
            client: {
                id: config.clientId,
                secret: config.clientSecret,
            },
        });
        this.pool = config.dbPool;

		if (!this.pool) {
			throw new Error("Connection pool is required");
		}


    }

    async getExtension(ext) {
		ext = String(ext);

        const query = gql`
            query fetchExtension($extensionId: ID!) {
                fetchExtension(extensionId: $extensionId) {
                    user {
                        extension
                        name
                        extPassword
                        voicemail
                    }
                }
            }
        `;

        const variables = {
            extensionId: ext.match(/\d+/)[0],
        };

        return await this.client.request(query, variables);
    }

    async listExtensions() {
        const query = gql`
            query {
                fetchAllExtensions {
                    extension {
                        user {
                            extension
                            name
                        }
                    }
                }
            }
        `;

        return await this.client.request(query);
    }

    async addExtension(ext, name) {
		ext = String(ext);
		name = String(name);

        const query = gql`
            mutation addExtension($ext: ID!, $name: String!, $vmPassword: String!) {
                addExtension(input: {
                    extensionId: $ext
                    name: $name
                    vmEnable: true
                    vmPassword: $vmPassword
                    email: ""
                    maxContacts: "100"
                    umEnable: false
                }) {
                    status
                }
            }
        `;

        const variables = {
            ext,
            name,
            vmPassword: ext,
        };

        return await this.client.request(query, variables);
    }

    async deleteExtension(ext) {
		ext = String(ext);
        const query = gql`
            mutation deleteExtension($ext: ID!) {
                deleteExtension(input: { extensionId: $ext }) {
                    status
                }
            }
        `;

        const variables = {
            ext,
        };

		const fpbxQuery = this.client.request(query, variables);
		const dbQuery = this.pool.query('DELETE FROM paging_groups WHERE ext = ?', [ext]);
        return await Promise.all([fpbxQuery, dbQuery]);
    }

    async reload() {
        const query = gql`
            mutation {
                doreload(input: { clientMutationId: "${Math.random().toString(36).substring(2, 14)}" }) {
                    status
                }
            }
        `;

        return await this.client.request(query);
    }

    // async updateName(ext, name) {
    //     const query = gql`
	// 	mutation updateName($ext: ID!, $name: String!) {
	// 			updateExtension(input: {extensionId: $ext, name: $name}) {
	// 				status,
	// 				message
	// 			}
	// 		}`;

    //     const variables = {
    //         ext,
    //         name,
    //     };

    //     return await this.client.request(query, variables);
    // }
	// TODO: Implement updateName method, Current implementation resets extension for some reason

	async joinPageGroup(ext, pageGroup) {
		const [lookup] = await this.pool.query('SELECT * FROM paging_groups WHERE page_number = ? AND ext = ?', [pageGroup, ext]);
		if (lookup) {
			return false;
		}

		await this.pool.query('INSERT INTO paging_groups (page_number, ext) VALUES (?, ?)', [pageGroup, ext]);
		return true;
	};

	async leavePageGroup(ext, pageGroup) {
		const [lookup] = await this.pool.query('SELECT * FROM paging_groups WHERE page_number = ? AND ext = ?', [pageGroup, ext]);
		if (!lookup) {
			return false;
		}

		await this.pool.query('DELETE FROM paging_groups WHERE page_number = ? AND ext = ?', [pageGroup, ext]);
		return true;
	};

	async getNextAvailableExtension() {
		const extList = await this.listExtensions();
		const exts = extList.fetchAllExtensions.extension;
		const startExt = process.env.START_EXT ? parseInt(process.env.START_EXT, 10) : 1000;
		const existingExts = exts.map(ext => parseInt(ext.user.extension, 10)).sort((a, b) => a - b);

		let nextExt = startExt;
		for (let i = 0; i < existingExts.length; i++) {
			if (existingExts[i] !== nextExt) {
				break;
			}
			nextExt++;
		}

		return nextExt;
	}
}

module.exports = FreepbxManager;