'use strict'

export function getMatchedComponents (route) {
  return [].concat.apply([], route.matched.map(function (m) {
    return Object.keys(m.components).map(function (key) {
      return m.components[key]
    })
  }))
}

export function getMatchedComponentsInstances (route) {
  return [].concat.apply([], route.matched.map(function (m) {
    return Object.keys(m.instances).map(function (key) {
      return m.instances[key]
    })
  }))
}

export function flatMapComponents (route, fn) {
  return Array.prototype.concat.apply([], route.matched.map(function (m, index) {
    return Object.keys(m.components).map(function (key) {
      return fn(m.components[key], m.instances[key], m, key, index)
    })
  }))
}

export function getContext (context) {
  let ctx = {
    isServer: !!context.isServer,
    isClient: !!context.isClient,
    isDev: <%= isDev %>,
    <%= (store ? 'store: context.store,' : '') %>
    route: (context.to ? context.to : context.route),
    error: context.error,
    base: '<%= router.base %>',
    env: <%= JSON.stringify(env) %>
  }
  const next = context.next
  ctx.params = ctx.route.params || {}
  ctx.query = ctx.route.query || {}
  ctx.redirect = function (status, path, query) {
    if (!status) return
    // if only 1 or 2 arguments: redirect('/') or redirect('/', { foo: 'bar' })
    if (typeof status === 'string' && (typeof path === 'undefined' || typeof path === 'object')) {
      query = path || {}
      path = status
      status = 302
    }
    next({
      path: path,
      query: query,
      status: status
    })
  }
  if (context.req) ctx.req = context.req
  if (context.res) ctx.res = context.res
  return ctx
}

export function promisify (fn, context) {
  let promise
  if (fn.length === 2) {
    // fn(context, callback)
    promise = new Promise((resolve) => {
      fn(context, function (err, data) {
        if (err) {
          context.error(err)
        }
        data = data || {}
        resolve(data)
      })
    })
  } else {
    promise = fn(context)
  }
  if (!(promise instanceof Promise)) {
    promise = Promise.resolve(promise)
  }
  return promise
}

// Imported from vue-router
export function getLocation (base) {
  var path = window.location.pathname
  if (base && path.indexOf(base) === 0) {
    path = path.slice(base.length)
  }
  return (path || '/') + window.location.search + window.location.hash
}

export function urlJoin () {
  return [].slice.call(arguments).join('/').replace(/\/+/g, '/')
}