import { setupBinding } from "../src/state/stateBinding"
import {
  BB_STATE_BINDINGPATH,
  BB_STATE_FALLBACK,
  BB_STATE_BINDINGSOURCE,
} from "../src/state/isState"
import { EVENT_TYPE_MEMBER_NAME } from "../src/state/eventHandlers"
import { writable } from "svelte/store"
import { isFunction } from "lodash/fp"

describe("setupBinding", () => {
  it("should correctly create initials props, including fallback values", () => {
    const { store, props, component } = testSetup()

    const { initialProps } = testSetupBinding(store, props, component)

    expect(initialProps.boundWithFallback).toBe("Bob")
    expect(initialProps.boundNoFallback).toBeUndefined()
    expect(initialProps.unbound).toBe("hello")

    expect(isFunction(initialProps.eventBound)).toBeTruthy()
    initialProps.eventBound()
  })

  it("should update component bound props when store is updated", () => {
    const { component, store, props } = testSetup()

    const { bind } = testSetupBinding(store, props, component)
    bind(component)

    store.update(s => {
      s.FirstName = "Bobby"
      s.LastName = "Thedog"
      s.Customer = {
        Name: "ACME inc",
        Address: "",
      }
      s.addressToSet = "123 Main Street"
      return s
    })

    expect(component.props.boundWithFallback).toBe("Bobby")
    expect(component.props.boundNoFallback).toBe("Thedog")
    expect(component.props.multiPartBound).toBe("ACME inc")
  })

  it("should not update unbound props when store is updated", () => {
    const { component, store, props } = testSetup()

    const { bind } = testSetupBinding(store, props, component)
    bind(component)

    store.update(s => {
      s.FirstName = "Bobby"
      s.LastName = "Thedog"
      s.Customer = {
        Name: "ACME inc",
        Address: "",
      }
      s.addressToSet = "123 Main Street"
      return s
    })

    expect(component.props.unbound).toBe("hello")
  })

  it("should update event handlers on state change", () => {
    const { component, store, props } = testSetup()

    const { bind } = testSetupBinding(store, props, component)
    bind(component)

    expect(component.props.boundToEventOutput).toBe("initial address")
    component.props.eventBound()
    expect(component.props.boundToEventOutput).toBe("event fallback address")

    store.update(s => {
      s.addressToSet = "123 Main Street"
      return s
    })

    component.props.eventBound()
    expect(component.props.boundToEventOutput).toBe("123 Main Street")
  })

  it("event handlers should recognise event parameter", () => {
    const { component, store, props } = testSetup()

    const { bind } = testSetupBinding(store, props, component)
    bind(component)

    expect(component.props.boundToEventOutput).toBe("initial address")
    component.props.eventBoundUsingEventParam({
      addressOverride: "Overridden Address",
    })
    expect(component.props.boundToEventOutput).toBe("Overridden Address")

    store.update(s => {
      s.addressToSet = "123 Main Street"
      return s
    })

    component.props.eventBound()
    expect(component.props.boundToEventOutput).toBe("123 Main Street")

    component.props.eventBoundUsingEventParam({
      addressOverride: "Overridden Address",
    })
    expect(component.props.boundToEventOutput).toBe("Overridden Address")
  })

  it("should bind initial props to supplied context", () => {
    const { component, store, props } = testSetup()

    const { bind } = testSetupBinding(store, props, component, {
      ContextValue: "Real Context Value",
    })
    bind(component)

    expect(component.props.boundToContext).toBe("Real Context Value")
  })
});

const testSetupBinding = (store, props, component, context) => {
  const setup = setupBinding(store, props, undefined, context)
  component.props = setup.initialProps // svelte does this for us in real life
  return setup
}
const testSetup = () => {
  const c = {}

  c.props = {}
  c.$set = propsToSet => {
    for (let pname in propsToSet) c.props[pname] = propsToSet[pname]
  }

  const binding = (path, fallback, source) => ({
    [BB_STATE_BINDINGPATH]: path,
    [BB_STATE_FALLBACK]: fallback,
    [BB_STATE_BINDINGSOURCE]: source || "store"
  });

  const event = (handlerType, parameters) => ({
    [EVENT_TYPE_MEMBER_NAME]: handlerType,
    parameters
  });

  const props = {
    boundWithFallback: binding("FirstName", "Bob"),
    boundNoFallback: binding("LastName"),
    unbound: "hello",
    multiPartBound: binding("Customer.Name", "ACME"),
    boundToEventOutput: binding("Customer.Address", "initial address"),
    boundToContext: binding("ContextValue", "context fallback", "context"),
    eventBound: [
      event("Set State", {
        path: "Customer.Address",
        value: binding("addressToSet", "event fallback address"),
      }),
    ],
    eventBoundUsingEventParam: [
      event("Set State", {
        path: "Customer.Address",
        value: binding("addressOverride", "", "event"),
      }),
    ],
  }

  return {
    component: c,
    store: writable({}),
    props,
  }
}