git ssb

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const nest = require('depnest')
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const fs = require('fs')
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const { join } = require('path')
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const { get, cloneDeep, isEqual } = require('lodash')
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// This is needed to over-ride config.sync.load in patchcore.
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// By baking a fresh module with the config inside it,
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// we avoid a race condition around trying to set / get the config
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function configModule (config) {
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  var _config = {
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    complete: config,
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    custom: readCustomConfig(config)
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  }
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  function Getter (conf) {
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    return function (path, fallback) {
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      if (!path) return conf
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      return get(conf, path, fallback)
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    }
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  }
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  function setCustomConfig (path, arg) {
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    if (!Array.isArray(path) && typeof path !== 'string') {
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      const next = path
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      return writeCustomConfig(next)
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    }
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    const next = cloneDeep(_config.custom)
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    next.set(path, arg)
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    writeCustomConfig(next)
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  }
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  return {
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    configModule: {
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      gives: nest({
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        'config.sync.load': true,
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        'config.sync.get': true,
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        'config.sync.getCustom': true,
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        'config.sync.setCustom': true
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      }),
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      create: api => nest({
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        'config.sync.load': () => _config.complete,
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        'config.sync.get': Getter(_config.complete),
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        'config.sync.getCustom': Getter(_config.custom),
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        'config.sync.setCustom': setCustomConfig
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      })
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    }
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  }
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  function readCustomConfig (config) {
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    const str = fs.readFileSync(
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      join(config.path, 'config'),
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      'utf8'
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    )
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    return JSON.parse(str)
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  }
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  function writeCustomConfig (next) {
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    if (typeof next !== 'object') throw new Error('config must be an object!')
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    if (isEqual(_config.custom, next)) return
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    if (get(_config.custom, 'caps.sign') !== get(next, 'caps.sign')) throw new Error('do not change the caps.sign!')
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    fs.writeFile(
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      join(_config.complete.path, 'config'),
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      JSON.stringify(next, null, 2),
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      (err) => {
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        if (err) return console.error(err)
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        _config.custom = next
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      }
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    )
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  }
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}
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module.exports = configModule
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