import PicnicClient from "picnic-api"
import type {
  ApiConfig,
  Decorator,
  Delivery
} from "picnic-api/lib/types/picnic-api.js"
import type { ParsedArgs } from 'minimist'
import { DateTime } from "luxon"
import fs from "node:fs"
import { jsonOut, csvOut, sum, runCommands, getXdgConfigHome } from "./util.js"
import path from "node:path"
import repl from "node:repl"

namespace PicnicExt {
  export type PromoDecorator = {
    type: "PROMO";
    text: string
  };
  export type ExtendedDecorator = Decorator | PromoDecorator
  export interface Decorated {
    decorators?: Decorator[]
  }
}

function getDecorator(thing: PicnicExt.Decorated, name: "PROMO"): string | undefined
function getDecorator(thing: PicnicExt.Decorated, name: "QUANTITY"): number | undefined
function getDecorator(thing: PicnicExt.Decorated, name: "PRICE"): number | undefined
function getDecorator(thing: PicnicExt.Decorated, name: "PROMO", fallback: string): string
function getDecorator(thing: PicnicExt.Decorated, name: "QUANTITY", fallback: number): number
function getDecorator(thing: PicnicExt.Decorated, name: "PRICE", fallback: number): number
function getDecorator(
  thing: PicnicExt.Decorated,
  name: string,
  fallback?: number | string
): number | string | undefined {
  if (!thing.decorators) return fallback
  const j = thing.decorators as PicnicExt.ExtendedDecorator[]
  const l = j.filter(x => x.type == name)
  if (l.length > 0 && l[0].type == name) {
    switch (l[0].type) {
      case "QUANTITY":
        return l[0].quantity
      case "PRICE":
        return l[0].display_price
      case "PROMO":
        return l[0].text
    }
  }
  return fallback
}

function deliveryToCSV(delv: Delivery) {
  const delivered = DateTime.fromISO(delv.slot.window_start).toFormat(
    "yyyy-MM-dd HH:mm"
  )
  for (const order of delv.orders) {
    const ordered = DateTime.fromISO(order.creation_time).toFormat(
      "yyyy-MM-dd HH:mm"
    )
    for (const orderline of order.items) {
      const real_price = getDecorator(orderline, "PRICE", orderline.display_price)
      const totalprice = sum(orderline.items.map(x => x.price))
      const promo = real_price / totalprice
      for (const orderarticle of orderline.items) {
        csvOut({
          id: orderarticle.id,
          name: orderarticle.name,
          quantity: getDecorator(orderarticle, "QUANTITY", 1),
          price: Math.round(orderarticle.price * promo),
          promo: (1 - real_price / orderline.display_price).toFixed(2),
          unit_quantity: orderarticle.unit_quantity,
          ordered,
          delivered,
          delivery_id: delv.delivery_id,
        })
      }
    }
  }
}

const commands = (argv: ParsedArgs) => {
  const LOGIN_FILE = path.join(getXdgConfigHome(), "picnic-cli.json")

  const config: ApiConfig = fs.existsSync(LOGIN_FILE)
    ? JSON.parse(fs.readFileSync(LOGIN_FILE, "utf8"))
    : {}

  const p = new PicnicClient(config)

  return {
    async login(user: string, password: string) {
      await p.login(user, password)
      fs.writeFileSync(
        LOGIN_FILE,
        JSON.stringify({
          countryCode: p.countryCode,
          authKey: p.authKey,
        } as ApiConfig)
      )
    },
    async getUserDetails() {
      jsonOut(await p.getUserDetails())
    },
    async deliveries() {
      const deliveries = await p.getDeliveries()
      if (argv.json) {
        jsonOut(deliveries)
      } else {
        for (const delv of deliveries) {
          if (delv.status == "CANCELLED") continue
          const dt = DateTime.fromISO(
            delv.delivery_time ? delv.delivery_time.start : delv.slot.window_start
          )
          csvOut({
            id: delv.delivery_id,
            delivered: dt.toFormat("yyyy-MM-dd HH:mm"),
            status: delv.status,
            price: sum(delv.orders.map(x => x.total_price)),
          })
        }
      }
    },
    async delivery(...ids: string[]) {
      for (const deliveryId of ids) {
        const delv = await p.getDelivery(deliveryId)
        if (argv.json) {
          jsonOut(delv)
        } else {
          deliveryToCSV(delv)
        }
      }
    },
    async article(id: string) {
      jsonOut(await p.getArticle(id))
    },
    async "cart.list"() {
      const cart = await p.getShoppingCart()
      if (argv.json) {
        jsonOut(cart)
      } else {
        const out: any[] = []
        cart.items.map(orderLine => {
          const isGroup = orderLine.items.length > 1
          if (isGroup) {
            out.push({
              name: `<Group ${getDecorator(orderLine, "PROMO", "???")}>`,
              price: getDecorator(orderLine, "PRICE", orderLine.price)
            })
          }
          for (const item of orderLine.items) {
            out.push({
              id: item.id,
              name: item.name,
              quantity: getDecorator(item, "QUANTITY", 1),
              price: item.price
            })
          }
          if (isGroup) out.push({name: "</Group>"})
        })
        console.table(out);
      }
    },
    async "cart.add"(product: string, count: string = "1") {
      if (isNaN(+count)) throw new TypeError("count must be a number")
      await p.addProductToShoppingCart(product, +count)
    },
    async "cart.del"(product: string, count: string = "1") {
      if (isNaN(+count)) throw new TypeError("count must be a number")
      await p.removeProductFromShoppingCart(product, +count)
    },
    repl() {
      repl.start().context.p = p
    }
  }
}

runCommands(commands)