/**
 * MIT License
 *
 * Copyright (c) 2020-present, Elastic NV
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 */

import merge from 'deepmerge';
import { createOption } from 'commander';
import { readConfig } from './config';
import type { CliArgs, RunOptions } from './common_types';
import { isFile, THROTTLING_WARNING_MSG, warn } from './helpers';
import { readFileSync } from 'fs';

type Mode = 'run' | 'push';

/**
 * Normalize the options passed via CLI and Synthetics config file
 *
 * Order of preference for options:
 * 1. Local options configured via Runner API
 * 2. CLI flags
 * 3. Configuration file
 */
export async function normalizeOptions(
  cliArgs: CliArgs,
  mode: Mode = 'run'
): Promise<RunOptions> {
  /**
   * Move filtering flags from the top level to filter object
   * and delete the old keys
   */
  const grepOpts = {
    pattern: cliArgs.pattern,
    tags: cliArgs.tags,
    match: cliArgs.match,
  };
  delete cliArgs.pattern;
  delete cliArgs.tags;
  delete cliArgs.match;

  const options: RunOptions = {
    ...cliArgs,
    grepOpts,
    environment: process.env['NODE_ENV'] || 'development',
  };
  /**
   * Validate and read synthetics config file based on the environment
   */
  const config =
    cliArgs.config || !cliArgs.inline
      ? await readConfig(options.environment, cliArgs.config)
      : {};

  options.params = Object.freeze(merge(config.params, cliArgs.params || {}));
  options.fields = Object.freeze(
    merge(config.monitor?.fields ?? {}, cliArgs?.fields || {})
  );

  /**
   * Merge playwright options from CLI and Synthetics config
   * and prefer individual options over other option
   */
  const playwrightOpts = merge(
    config.playwrightOptions,
    cliArgs.playwrightOptions || {},
    {
      arrayMerge(target, source) {
        if (source && source.length > 0) {
          return [...new Set(source)];
        }
        return target;
      },
    }
  );
  options.playwrightOptions = {
    ...playwrightOpts,
    headless: getHeadlessFlag(cliArgs.headless, playwrightOpts?.headless),
    chromiumSandbox: cliArgs.sandbox ?? playwrightOpts?.chromiumSandbox,
    ignoreHTTPSErrors:
      cliArgs.ignoreHttpsErrors ?? playwrightOpts?.ignoreHTTPSErrors,
  };

  options.proxy = Object.freeze(
    merge(config?.proxy ?? {}, cliArgs?.proxy || {})
  );

  /**
   * Merge default options based on the mode of operation whether we are running tests locally
   * or pushing the project monitors
   */
  switch (mode) {
    case 'run':
      if (cliArgs.capability) {
        const supportedCapabilities = [
          'trace',
          'network',
          'filmstrips',
          'metrics',
          'ssblocks',
        ];
        /**
         * trace - record chrome trace events(LCP, FCP, CLS, etc.) for all journeys
         * network - capture network information for all journeys
         * filmstrips - record detailed filmstrips for all journeys
         * metrics - capture performance metrics (DOM Nodes, Heap size, etc.) for each step
         * ssblocks - Dedupes the screenshots in to blocks to save storage space
         */
        for (const flag of cliArgs.capability) {
          if (supportedCapabilities.includes(flag)) {
            options[flag] = true;
          } else {
            console.warn(
              `Missing capability "${flag}", current supported capabilities are ${supportedCapabilities.join(
                ', '
              )}`
            );
          }
        }
      }

      /**
       * Group all events that can be consumed by heartbeat and
       * eventually by the Synthetics UI.
       */
      if (cliArgs.richEvents) {
        options.reporter = cliArgs.reporter ?? 'json';
        options.ssblocks = true;
        options.network = true;
        options.trace = true;
        options.quietExitCode = true;
      }

      options.screenshots = cliArgs.screenshots ?? 'on';
      break;
    case 'push':
      /**
       * Merge the default monitor config from synthetics.config.ts file
       * with the CLI options passed via push command
       */
      const monitor = config.monitor;
      for (const key of Object.keys(monitor || {})) {
        // screenshots require special handling as the flags are different
        if (key === 'screenshot') {
          options.screenshots = options.screenshots ?? monitor[key];
          continue;
        }
        options[key] = options[key] ?? monitor[key];
      }
      break;
  }
  return options;
}

export function getHeadlessFlag(
  cliHeadless: boolean,
  configHeadless?: boolean
) {
  // if cliHeadless is false, then we don't care about configHeadless
  if (!cliHeadless) {
    return false;
  }
  // default is headless
  return configHeadless ?? true;
}

/* eslint-disable-next-line @typescript-eslint/no-unused-vars */
function toObject(value: boolean | Record<string, any>): Record<string, any> {
  const defaulVal = {};
  if (typeof value === 'boolean') {
    return defaulVal;
  }
  return value || defaulVal;
}

/**
 * Parses the throttling CLI settings with `{download: 5, upload: 3, latency:
 * 20}` format
 *
 * Since throttling is disabled for now, we warn the users if throttling/nothrottling
 * flag is passed to the CLI
 */
export function parseThrottling() {
  warn(THROTTLING_WARNING_MSG);
}

export function getCommonCommandOpts() {
  const params = createOption(
    '-p, --params <jsonstring>',
    'JSON object that defines any variables your tests require.'
  ).argParser(JSON.parse);

  const playwrightOpts = createOption(
    '--playwright-options <jsonstring>',
    'JSON object to pass in custom Playwright options for the agent. Options passed will be merged with Playwright options defined in your synthetics.config.js file.'
  ).argParser(parsePlaywrightOptions);

  const pattern = createOption(
    '--pattern <pattern>',
    'RegExp pattern to match journey files in the current working directory (default: /*.journey.(ts|js)$/)'
  );

  const apiDocsLink =
    'API key used for Kibana authentication(https://www.elastic.co/guide/en/kibana/master/api-keys.html).';
  const auth = createOption('--auth <auth>', apiDocsLink).env(
    'SYNTHETICS_API_KEY'
  );

  const authMandatory = createOption('--auth <auth>', apiDocsLink)
    .env('SYNTHETICS_API_KEY')
    .makeOptionMandatory(true);

  const configOpt = createOption(
    '-c, --config <path>',
    'path to the configuration file (default: synthetics.config.(js|ts))'
  );

  const tags = createOption(
    '--tags <name...>',
    'run/push tests with the tag(s) matching a pattern'
  );
  const match = createOption(
    '--match <name>',
    'run/push tests with a name or tags that matches a pattern'
  );
  const fields = createOption(
    '--fields <jsonstring>',
    'add fields to the monitor(s) in the format { "key": "value"}'
  ).argParser((fieldsStr: string) => {
    const fields = JSON.parse(fieldsStr);
    if (typeof fields !== 'object') {
      throw new Error('Invalid fields format');
    }
    // make sure all values are strings
    return Object.entries(fields).reduce((acc, [key, value]) => {
      if (typeof value !== 'string') {
        acc[key] = JSON.stringify(value);
      } else {
        acc[key] = value;
      }
      return acc;
    }, {});
  });

  const maintenanceWindows = createOption(
    '--maintenance-windows <ids...>',
    "List of Kibana's Maintenance Windows IDs assigned by default. More information on https://www.elastic.co/docs/explore-analyze/alerts-cases/alerts/maintenance-windows."
  );

  return {
    auth,
    authMandatory,
    params,
    playwrightOpts,
    pattern,
    configOpt,
    tags,
    match,
    fields,
    maintenanceWindows,
  };
}

export function parsePlaywrightOptions(playwrightOpts: string) {
  return JSON.parse(playwrightOpts, (key, value) => {
    if (key !== 'clientCertificates') {
      return value;
    }

    // Revive serialized clientCertificates buffer objects
    return (value ?? []).map(item => {
      const revived = { ...item };
      if (item.cert && !Buffer.isBuffer(item.cert)) {
        revived.cert = parseAsBuffer(item.cert);
      }
      if (item.key && !Buffer.isBuffer(item.key)) {
        revived.key = parseAsBuffer(item.key);
      }
      if (item.pfx && !Buffer.isBuffer(item.pfx)) {
        revived.pfx = parseAsBuffer(item.pfx);
      }

      return revived;
    });
  });
}

function parseAsBuffer(value: any): Buffer {
  try {
    return Buffer.from(value);
  } catch (e) {
    return value;
  }
}

export function parseFileOption(opt: string) {
  return (value: string) => {
    if (!isFile(value)) {
      return value;
    }

    try {
      return readFileSync(value);
    } catch (e) {
      throw new Error(`${opt} - could not read provided path ${value}: ${e}`);
    }
  };
}

// This is a generic util to collect multiple options into a single
// dictionary
export function collectOpts(key, accumulator, nextParser?) {
  return value => {
    accumulator[key] = nextParser ? nextParser(value) : value;
    return accumulator[key];
  };
}