import axios from 'axios';

import type { key_val } from '$lib/ae_stores';

export let temp_get_blob_percent_completed = 0;
// export let get_blob_percent_completed = readable(temp_get_blob_percent_completed);
export let get_blob_percent_completed = temp_get_blob_percent_completed;

export let temp_get_object_percent_completed = 0;
// export let get_object_percent_completed = readable(temp_get_object_percent_completed);
export let get_object_percent_completed = temp_get_object_percent_completed;

// Updated 2024-05-23
export let get_object = async function get_object(
        {
            api_cfg=null,
            endpoint='',
            headers={},
            params={},
            data={},
            timeout=60000,
            return_meta=false,
            return_blob=false,
            filename='',
            auto_download=false,
            as_list=false,
            // The task_id value should be a random string that is unique to the task. This is used to identify the task in the message event.
            task_id=crypto.randomUUID(),
            log_lvl=0
        }: {
            api_cfg: any,
            endpoint: string,
            headers?: any,
            params?: any,
            data?: any,
            timeout?: number,
            return_meta?: boolean,
            return_blob?: boolean,
            filename?: null|string,
            auto_download?: boolean,
            as_list?: boolean,
            task_id?: string,
            log_lvl?: number
        }
        ) {
    if (log_lvl) {
        console.log(`*** get_object() *** Endpoint: ${endpoint} AE Task ID: ${task_id}`);
        console.log('Params:', params);
        if (log_lvl > 1) {
            console.log('Data:', data);
            console.log(`Base URL: ${api_cfg['base_url']}`);
            console.log('API Config:', api_cfg);
        }
        if (log_lvl > 2) {
            console.log(`Return Meta: ${return_meta}`);
            console.log(`Return Blob: ${return_blob}`);
            console.log(`Filename: ${filename}`);
            console.log(`Auto Download: ${auto_download}`);
        }
    }

    if (!api_cfg) {
        console.log('No API Config was provided. Returning false.');
        return false;
    }

    let axios_api = axios.create({
        baseURL: api_cfg['base_url'],
        timeout: timeout, // in milliseconds; 60000 = 60 seconds
        /* other custom settings */
    });
    axios_api.defaults.headers = api_cfg['headers'];
    if (log_lvl) {
        console.log('axios_api.defaults.headers:', axios_api.defaults.headers);
        console.log('Additional headers:', headers);
    }

    // console.log('Clean the headers. No _underscores_!')
    let headers_cleaned: key_val = {};
    for (const prop in headers) {
        // No underscores allowed in the header parameters!
        let prop_cleaned = prop.replaceAll('_', '-');

        // The value must be a string for the header!
        if (typeof headers[prop] != 'string') {
            headers[prop] = JSON.stringify(headers[prop]);
        }

        headers_cleaned[prop_cleaned] = headers[prop];

        if (log_lvl) {
            console.log(`${prop_cleaned}: ${headers_cleaned[prop_cleaned]}`);
        }
    }
    headers = headers_cleaned;
    if (log_lvl) {
        console.log('All headers cleaned:', headers);
    }

    if (log_lvl) {
        console.log('URL params:');
    }
    for (const prop in params) {
        if (log_lvl > 1) {
            console.log(`URL param: ${prop}: ${params[prop]}`);
        }
        if (params[prop] === null ) {
            params[prop] = 'null';
        }
    }

    if (!return_blob) {
        let response_data_promise = await axios_api.get(
                endpoint,
                {
                    headers: headers,
                    params: params,
                    onDownloadProgress: (progressEvent) => {
                        let percent_completed = Math.round(
                            (progressEvent.loaded * 100) / progressEvent.total
                        );
                        if (log_lvl > 1) {
                            console.log('GET Data Progress:', progressEvent.progress, 'Total:', progressEvent.total, 'Loaded:', progressEvent.loaded, 'Percent Completed', percent_completed);
                        }

                        temp_get_object_percent_completed = percent_completed;

                        // WARNING: This needs to be tied to an object type and ID. This is a temporary solution.
                        try {
                            // Check if window is defined. This is to prevent errors in SvelteKit.
                            if (typeof window !== 'undefined') {
                            window.postMessage({
                                type: 'api_download_data',
                                status: 'downloading',
                                task_id: task_id,
                                endpoint: endpoint,
                                filename: filename,
                                size_total: progressEvent.total,
                                size_loaded: progressEvent.loaded,
                                percent_completed: percent_completed,
                                },
                                '*'
                            );
                            }
                        } catch (error) {
                            console.log('Error posting message to window:', error);
                        }
                    }
                }
            )
        .then(function (response) {
            if (log_lvl) {
                console.log(`GET Response: status=${response.status} statusText=${response.statusText} baseURL=${response.config.baseURL} url=${response.config.url} method=${response.config.method} headers=${response.config.headers} params=${JSON.stringify(response.config.params)}`);
            }
            if (log_lvl > 1) {
                console.log('GET Response:', response);
            }

            // Post file download message
            try {
                if (typeof window !== 'undefined') {
                window.postMessage({
                    type: 'api_download_data',
                    status: 'complete',
                    task_id: task_id,
                    endpoint: endpoint,
                    filename: filename,
                    size_total: 0,
                    size_loaded: 0,
                    percent_completed: 100,
                    },
                    '*'
                );
                }
            } catch (error) {
                console.log('Error posting message to window:', error);
            }

            if (!Array.isArray(response.data['data']) && as_list) {
                if (log_lvl) {
                    console.log('Data result is a dictionary/object, not an array/list. Forcing return as an array/list');
                }
                let return_data = [];
                return_data.push(response.data['data']);
                return return_data;
            } else if (response.data['data']) {
                let return_data = response.data['data'];
                if (log_lvl) {
                    if (Array.isArray(return_data)) {
                        console.log(`Data result is an array/list. Array length: ${return_data.length}`);
                    } else {
                        console.log(`Data result is a dictionary/object, not an array/list.`);
                    }
                }
                return return_data;
            } else {
                let return_data = response.data;
                if (log_lvl) {
                    if (Array.isArray(return_data)) {
                        console.log(`Not a standard response from Aether's API. Data result is an array/list. Array length: ${return_data.length}`);
                    } else {
                        console.log(`Not a standard response from Aether's API. Data result is a dictionary/object, not an array/list.`);
                    }
                }
                return return_data;
            }
        })
        .catch(function (error) {
            // Handle the common and expected 404 "error" first
            if (error.response && error.response.status === 404) {
                if (log_lvl) {
                    console.log('The response was a 404 not found "error". Returning null.');
                }
                if (log_lvl > 1) {
                    console.log(error.response);
                }
                if (log_lvl > 2) {
                    console.log(error);
                }
                return null; // Returning null since there were no results
            }

            if (log_lvl) {
                console.log(`Base URL: ${api_cfg['base_url']} | Endpoint: ${endpoint}`);
                console.log('Error Message:', error.message); // Is this needed here or below in the in the else portion???

                if (error.response) {
                    // The request was made and the server responded with a status code that falls out of the range of 2xx
                    console.log('Error Response Data', error.response.data);
                    console.log('Error Response Status', error.response.status);
                    console.log('Error Response Headers', error.response.headers);
                } else if (error.request) {
                    // The request was made but no response was received `error.request` is an instance of XMLHttpRequest in the browser and an instance of http.ClientRequest in node.js
                    if (log_lvl > 1) {
                        console.log('Error Request', error.request);
                    }
                } else {
                    // Something happened in setting up the request that triggered an Error
                    console.log('Error Message', error.message);
                }
            }
            if (log_lvl > 2) {
                console.log('Error:', error);
                console.log(error.config);
            }

            if (error.code === 'ECONNABORTED') {
                // Timeout Error (You can implement retry here where suitable)
                console.log('Timeout Error: ', error.message);
            }
            if (log_lvl) {
                console.log('The response was an error. Returning false.');
            }

            return false; // Returning false since something may have gone wrong. This includes timeouts. Also more in line with what the API returns.
            // return error;
        });

        if (log_lvl > 1) {
            // console.log(`Response Data: ${response_data_promise}`);
            console.log(`Response Data:`, response_data_promise);
            // console.log(response_data_promise);
        }
        if (response_data_promise) {
            // The most common and expected response.
            // console.log('Returning result. This is generally expected.');
            return response_data_promise;
        } else if (response_data_promise === null) {
            // Less common, but expected response if no results were returned.
            if (log_lvl) {
                console.log('Returning null. This is expected if no results were found.');
            }
            return response_data_promise;
        } else if (response_data_promise === false) {
            // Not common, but expected response if the request to the API had an issue.
            console.log('Returning false. There may have been an issue with this request.');
            return response_data_promise;
        } else {
            // This generally should not happen. It likely means the query was bad or an API issue.
            console.log('Returning unknown. This should not happen in most cases.');
            Promise.reject(new Error('fail')).then(resolved, rejected);
        }
    } else {
        // console.log('Expecting a Blob to be returned...');

        let response_data_promise = await axios_api.get(
                endpoint,
                {
                    params: params,
                    responseType: 'blob',
                    onDownloadProgress: (progressEvent) => {
                        let percent_completed = Math.round(
                            (progressEvent.loaded * 100) / progressEvent.total
                        );
                        console.log('GET Blob Progress:', progressEvent.progress, 'Total:', progressEvent.total, 'Loaded:', progressEvent.loaded, 'Percent Completed', percent_completed);

                        temp_get_blob_percent_completed = percent_completed;

                        // WARNING: This needs to be tied to an object type and ID. This is a temporary solution.
                        try {
                            if (typeof window !== 'undefined') {
                            window.postMessage({
                                type: 'api_download_blob',
                                status: 'downloading',
                                task_id: task_id,
                                endpoint: endpoint,
                                filename: filename,
                                size_total: progressEvent.total,
                                size_loaded: progressEvent.loaded,
                                percent_completed: percent_completed,
                                },
                                '*'
                            );
                            }
                        } catch (error) {
                            console.log('Error posting message to window:', error);
                        }
                    }
                }
            )
        .then(function (response) {
            if (log_lvl) {
                console.log(`GET (blob) Response: status=${response.status} statusText=${response.statusText} baseURL=${response.config.baseURL} url=${response.config.url} method=${response.config.method} headers=${response.config.headers} params=${response.config.params}`);
            }
            if (log_lvl > 1) {
                console.log('GET (blob) Response:', response);
            }

            const { data, headers } = response;

            // Careful if this download filename needs to be changed to a different file extension. The browser/client may not know how to handle it.
            if (filename) {
            } else if (headers['content-disposition']) {
                filename = headers['content-disposition'].replace(/\w+;filename=(.*)/, '$1');
            } else {
                filename = 'unknown_file.ext';
            }

            // WARNING: This needs to be tied to an object type and ID. This is a temporary solution.
            try {
                if (typeof window !== 'undefined') {
                window.postMessage({
                    type: 'api_download_blob',
                    status: 'complete',
                    task_id: task_id,
                    endpoint: endpoint,
                    filename: filename,
                    size_total: 0,
                    size_loaded: 0,
                    percent_completed: 100,
                    },
                    '*'
                );
                }
            } catch (error) {
                console.log('Error posting message to window:', error);
            }

            if (auto_download) {
                if (log_lvl) {
                    console.log(`Auto Download: ${filename}`);
                }
                const url = window.URL.createObjectURL(new Blob([response.data]));
                const link = document.createElement('a');
                link.href = url;
                link.setAttribute('download', filename);
                document.body.appendChild(link);
                link.click();
                return true;
            } else {
                return response;
            }
        });

        if (response_data_promise) {
            // The most common and expected response.
            // console.log('Returning result. This is generally expected.');
            // let test_blob = new Blob([response_data_promise.data]);
            // console.log(test_blob);
            // return test_blob;
            // console.log(response_data_promise.blob());
            return response_data_promise;
        } else {
            // This generally should not happen. It likely means the query was bad or an API issue.
            console.log('Returning (blob) unknown. This should not happen in most cases.');
            Promise.reject(new Error('fail')).then(resolved, rejected);
        }
    }
}


function resolved(result: any) {
    console.log('Resolved');
}

function rejected(result: any) {
    console.error(result);
}