module.exports = registerEndpoints

const { Deprecation } = require('deprecation')

function registerEndpoints (octokit, routes) {
  Object.keys(routes).forEach(namespaceName => {
    if (!octokit[namespaceName]) {
      octokit[namespaceName] = {}
    }

    Object.keys(routes[namespaceName]).forEach(apiName => {
      const apiOptions = routes[namespaceName][apiName]

      const endpointDefaults = ['method', 'url', 'headers'].reduce((map, key) => {
        if (typeof apiOptions[key] !== 'undefined') {
          map[key] = apiOptions[key]
        }

        return map
      }, {})

      endpointDefaults.request = {
        validate: apiOptions.params
      }

      let request = octokit.request.defaults(endpointDefaults)

      // patch request & endpoint methods to support deprecated parameters.
      // Not the most elegant solution, but we don’t want to move deprecation
      // logic into octokit/endpoint.js as it’s out of scope
      const hasDeprecatedParam = Object.keys(apiOptions.params || {}).find(key => apiOptions.params[key].deprecated)
      if (hasDeprecatedParam) {
        const patch = patchForDeprecation.bind(null, octokit, apiOptions)
        request = patch(
          octokit.request.defaults(endpointDefaults),
          `.${namespaceName}.${apiName}()`
        )
        request.endpoint = patch(
          request.endpoint,
          `.${namespaceName}.${apiName}.endpoint()`
        )
        request.endpoint.merge = patch(
          request.endpoint.merge,
          `.${namespaceName}.${apiName}.endpoint.merge()`
        )
      }

      if (apiOptions.deprecated) {
        octokit[namespaceName][apiName] = function deprecatedEndpointMethod () {
          octokit.log.warn(new Deprecation(`[@octokit/rest] ${apiOptions.deprecated}`))
          octokit[namespaceName][apiName] = request
          return request.apply(null, arguments)
        }

        return
      }

      octokit[namespaceName][apiName] = request
    })
  })
}

function patchForDeprecation (octokit, apiOptions, method, methodName) {
  const patchedMethod = (options) => {
    options = Object.assign({}, options)

    Object.keys(options).forEach(key => {
      if (apiOptions.params[key] && apiOptions.params[key].deprecated) {
        const aliasKey = apiOptions.params[key].alias

        octokit.log.warn(new Deprecation(`[@octokit/rest] "${key}" parameter is deprecated for "${methodName}". Use "${aliasKey}" instead`))

        if (!(aliasKey in options)) {
          options[aliasKey] = options[key]
        }
        delete options[key]
      }
    })

    return method(options)
  }
  Object.keys(method).forEach(key => {
    patchedMethod[key] = method[key]
  })

  return patchedMethod
}