"use strict";

const _ = require(`lodash`);

const semver = require(`semver`);

const stringSimiliarity = require(`string-similarity`);

const {
  version: gatsbyVersion
} = require(`gatsby/package.json`);

const reporter = require(`gatsby-cli/lib/reporter`);

const resolveModuleExports = require(`../resolve-module-exports`);

const getGatsbyUpgradeVersion = entries => entries.reduce((version, entry) => {
  if (entry.api && entry.api.version) {
    return semver.gt(entry.api.version, version || `0.0.0`) ? entry.api.version : version;
  }

  return version;
}, ``); // Given a plugin object, an array of the API names it exports and an
// array of valid API names, return an array of invalid API exports.


const getBadExports = (plugin, pluginAPIKeys, apis) => {
  let badExports = []; // Discover any exports from plugins which are not "known"

  badExports = badExports.concat(_.difference(pluginAPIKeys, apis).map(e => {
    return {
      exportName: e,
      pluginName: plugin.name,
      pluginVersion: plugin.version
    };
  }));
  return badExports;
};

const getErrorContext = (badExports, exportType, currentAPIs, latestAPIs) => {
  const entries = badExports.map(ex => {
    return Object.assign({}, ex, {
      api: latestAPIs[exportType][ex.exportName]
    });
  });
  const gatsbyUpgradeVersion = getGatsbyUpgradeVersion(entries);
  let errors = [];
  let fixes = [].concat(gatsbyUpgradeVersion ? [`npm install gatsby@^${gatsbyUpgradeVersion}`] : []);
  entries.forEach(entry => {
    const similarities = stringSimiliarity.findBestMatch(entry.exportName, currentAPIs[exportType]);
    const isDefaultPlugin = entry.pluginName == `default-site-plugin`;
    const message = entry.api ? entry.api.version ? `was introduced in gatsby@${entry.api.version}` : `is not available in your version of Gatsby` : `is not a known API`;

    if (isDefaultPlugin) {
      errors.push(`- Your local gatsby-${exportType}.js is using the API "${entry.exportName}" which ${message}.`);
    } else {
      errors.push(`- The plugin ${entry.pluginName}@${entry.pluginVersion} is using the API "${entry.exportName}" which ${message}.`);
    }

    if (similarities.bestMatch.rating > 0.5) {
      fixes.push(`Rename "${entry.exportName}" -> "${similarities.bestMatch.target}"`);
    }
  });
  return {
    errors,
    entries,
    exportType,
    fixes,
    // note: this is a fallback if gatsby-cli is not updated with structured error
    sourceMessage: [`Your plugins must export known APIs from their gatsby-node.js.`].concat(errors).concat(fixes.length > 0 && [`\n`, `Some of the following may help fix the error(s):`, ...fixes]).filter(Boolean).join(`\n`)
  };
};

const handleBadExports = ({
  currentAPIs,
  latestAPIs,
  badExports
}) => {
  // Output error messages for all bad exports
  _.toPairs(badExports).forEach(badItem => {
    const [exportType, entries] = badItem;

    if (entries.length > 0) {
      const context = getErrorContext(entries, exportType, currentAPIs, latestAPIs);
      reporter.error({
        id: `11329`,
        context
      });
    }
  });
};
/**
 * Identify which APIs each plugin exports
 */


const collatePluginAPIs = ({
  currentAPIs,
  flattenedPlugins
}) => {
  // Get a list of bad exports
  const badExports = {
    node: [],
    browser: [],
    ssr: []
  };
  flattenedPlugins.forEach(plugin => {
    plugin.nodeAPIs = [];
    plugin.browserAPIs = [];
    plugin.ssrAPIs = []; // Discover which APIs this plugin implements and store an array against
    // the plugin node itself *and* in an API to plugins map for faster lookups
    // later.

    const pluginNodeExports = resolveModuleExports(`${plugin.resolve}/gatsby-node`, {
      mode: `require`
    });
    const pluginBrowserExports = resolveModuleExports(`${plugin.resolve}/gatsby-browser`);
    const pluginSSRExports = resolveModuleExports(`${plugin.resolve}/gatsby-ssr`);

    if (pluginNodeExports.length > 0) {
      plugin.nodeAPIs = _.intersection(pluginNodeExports, currentAPIs.node);
      badExports.node = badExports.node.concat(getBadExports(plugin, pluginNodeExports, currentAPIs.node)); // Collate any bad exports
    }

    if (pluginBrowserExports.length > 0) {
      plugin.browserAPIs = _.intersection(pluginBrowserExports, currentAPIs.browser);
      badExports.browser = badExports.browser.concat(getBadExports(plugin, pluginBrowserExports, currentAPIs.browser)); // Collate any bad exports
    }

    if (pluginSSRExports.length > 0) {
      plugin.ssrAPIs = _.intersection(pluginSSRExports, currentAPIs.ssr);
      badExports.ssr = badExports.ssr.concat(getBadExports(plugin, pluginSSRExports, currentAPIs.ssr)); // Collate any bad exports
    }
  });
  return {
    flattenedPlugins,
    badExports
  };
};

const handleMultipleReplaceRenderers = ({
  flattenedPlugins
}) => {
  // multiple replaceRenderers may cause problems at build time
  const rendererPlugins = flattenedPlugins.filter(plugin => plugin.ssrAPIs.includes(`replaceRenderer`)).map(plugin => plugin.name);

  if (rendererPlugins.length > 1) {
    if (rendererPlugins.includes(`default-site-plugin`)) {
      reporter.warn(`replaceRenderer API found in these plugins:`);
      reporter.warn(rendererPlugins.join(`, `));
      reporter.warn(`This might be an error, see: https://www.gatsbyjs.org/docs/debugging-replace-renderer-api/`);
    } else {
      console.log(``);
      reporter.error(`Gatsby's replaceRenderer API is implemented by multiple plugins:`);
      reporter.error(rendererPlugins.join(`, `));
      reporter.error(`This will break your build`);
      reporter.error(`See: https://www.gatsbyjs.org/docs/debugging-replace-renderer-api/`);
      if (process.env.NODE_ENV === `production`) process.exit(1);
    } // Now update plugin list so only final replaceRenderer will run


    const ignorable = rendererPlugins.slice(0, -1); // For each plugin in ignorable, set a skipSSR flag to true
    // This prevents apiRunnerSSR() from attempting to run it later

    const messages = [];
    flattenedPlugins.forEach((fp, i) => {
      if (ignorable.includes(fp.name)) {
        messages.push(`Duplicate replaceRenderer found, skipping gatsby-ssr.js for plugin: ${fp.name}`);
        flattenedPlugins[i].skipSSR = true;
      }
    });

    if (messages.length > 0) {
      console.log(``);
      messages.forEach(m => reporter.warn(m));
      console.log(``);
    }
  }

  return flattenedPlugins;
};

function warnOnIncompatiblePeerDependency(name, packageJSON) {
  // Note: In the future the peer dependency should be enforced for all plugins.
  const gatsbyPeerDependency = _.get(packageJSON, `peerDependencies.gatsby`);

  if (gatsbyPeerDependency && !semver.satisfies(gatsbyVersion, gatsbyPeerDependency, {
    includePrerelease: true
  })) {
    reporter.warn(`Plugin ${name} is not compatible with your gatsby version ${gatsbyVersion} - It requires gatsby@${gatsbyPeerDependency}`);
  }
}

module.exports = {
  collatePluginAPIs,
  handleBadExports,
  handleMultipleReplaceRenderers,
  warnOnIncompatiblePeerDependency
};
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