import {Resvg} from "@resvg/resvg-js";
import {JSDOM} from "jsdom";

export interface GameStatus {
  health: number
  unstable: boolean
  healthDelta: number
  experience: number
  experienceDelta: number
  luck: number
  luckDelta: number
}

export interface GameStatusWithPortrait extends GameStatus {
  portrait: Buffer
}

function removeElement(dom: Element): void {
  dom.remove()
}

function healthBelow(health: number): (status: GameStatus) => boolean {
  return (s) => s.health < health
}

function luckBelow(luck: number): (status: GameStatus) => boolean {
  return (s) => s.luck < luck
}

function experienceBelow(exp: number): (status: GameStatus) => boolean {
  return (s) => s.experience < exp
}

function healthNotEqual(health: number): (status: GameStatus) => boolean {
  return (s) => s.health !== health
}

function experienceDeltaNotIncludes(index: number): (status: GameStatus) => boolean {
  return (s) => {
    if (s.experienceDelta <= 0) {
      return true
    }
    const effectiveMax = Math.min(5, s.experience)
    return !(index <= effectiveMax && index > effectiveMax - s.experienceDelta)
  }
}

function luckDeltaNotIncludes(index: number): (status: GameStatus) => boolean {
  return (s) => {
    if (s.luckDelta === 0) {
      return true
    } else if (s.luckDelta > 0) {
      return !((index <= s.luck) && (index > s.luck - s.luckDelta))
    } else {
      return !((index > s.luck) && (index <= s.luck - s.luckDelta))
    }
  }
}

function healthDamageNotIncludes(index: number): (status: GameStatus) => boolean {
  return (s) => {
    if (s.healthDelta >= 0) {
      return true
    }
    return !((index > s.health) && (index <= s.health - s.healthDelta))
  }
}

function healthRecoveredNotIncludes(index: number): (status: GameStatus) => boolean {
  return (s) => {
    if (s.healthDelta <= 0) {
      return true
    }
    return !((index <= s.health) && (index > s.health - s.healthDelta))
  }
}

function notStableAlive(): (status: GameStatus) => boolean {
  return (status) => status.unstable || status.health <= 0
}

function notUnstableAlive(): (status: GameStatus) => boolean {
  return (status) => !status.unstable || status.health <= 0
}

function notDead(): (status: GameStatus) => boolean {
  return (status) => status.health > 0
}

function dead(): (status: GameStatus) => boolean {
  return (status) => status.health <= 0
}

const mappings: [filter: (status: GameStatus) => boolean, selector: string, hit: (dom: Element) => void][] = [
  [healthBelow(8), "#health8", removeElement],
  [healthBelow(7), "#health7", removeElement],
  [healthBelow(6), "#health6", removeElement],
  [healthBelow(5), "#health5", removeElement],
  [healthBelow(4), "#health4", removeElement],
  [healthBelow(3), "#health3", removeElement],
  [healthBelow(2), "#health2", removeElement],
  [healthBelow(1), "#health1", removeElement],

  [luckBelow(7), "#luck7", removeElement],
  [luckBelow(6), "#luck6", removeElement],
  [luckBelow(5), "#luck5", removeElement],
  [luckBelow(4), "#luck4", removeElement],
  [luckBelow(3), "#luck3", removeElement],
  [luckBelow(2), "#luck2", removeElement],
  [luckBelow(1), "#luck1", removeElement],

  [experienceBelow(5), "#experienceLevelUpReady", removeElement],
  [experienceBelow(5), "#experience5", removeElement],
  [experienceBelow(4), "#experience4", removeElement],
  [experienceBelow(3), "#experience3", removeElement],
  [experienceBelow(2), "#experience2", removeElement],
  [experienceBelow(1), "#experience1", removeElement],

  [healthDamageNotIncludes(8), "#healthDamage8", removeElement],
  [healthDamageNotIncludes(7), "#healthDamage7", removeElement],
  [healthDamageNotIncludes(6), "#healthDamage6", removeElement],
  [healthDamageNotIncludes(5), "#healthDamage5", removeElement],
  [healthDamageNotIncludes(4), "#healthDamage4", removeElement],
  [healthDamageNotIncludes(3), "#healthDamage3", removeElement],
  [healthDamageNotIncludes(2), "#healthDamage2", removeElement],
  [healthDamageNotIncludes(1), "#healthDamage1", removeElement],

  [healthRecoveredNotIncludes(8), "#healthRecovery8", removeElement],
  [healthRecoveredNotIncludes(7), "#healthRecovery7", removeElement],
  [healthRecoveredNotIncludes(6), "#healthRecovery6", removeElement],
  [healthRecoveredNotIncludes(5), "#healthRecovery5", removeElement],
  [healthRecoveredNotIncludes(4), "#healthRecovery4", removeElement],
  [healthRecoveredNotIncludes(3), "#healthRecovery3", removeElement],
  [healthRecoveredNotIncludes(2), "#healthRecovery2", removeElement],
  [healthRecoveredNotIncludes(1), "#healthRecovery1", removeElement],

  [healthNotEqual(8), "#healthCounter8", removeElement],
  [healthNotEqual(7), "#healthCounter7", removeElement],
  [healthNotEqual(6), "#healthCounter6", removeElement],
  [healthNotEqual(5), "#healthCounter5", removeElement],
  [healthNotEqual(4), "#healthCounter4", removeElement],
  [healthNotEqual(3), "#healthCounter3", removeElement],
  [healthNotEqual(2), "#healthCounter2", removeElement],
  [healthNotEqual(1), "#healthCounter1", removeElement],
  [healthNotEqual(0), "#healthCounter0", removeElement],

  [luckDeltaNotIncludes(7), "#luckShine7", removeElement],
  [luckDeltaNotIncludes(6), "#luckShine6", removeElement],
  [luckDeltaNotIncludes(5), "#luckShine5", removeElement],
  [luckDeltaNotIncludes(4), "#luckShine4", removeElement],
  [luckDeltaNotIncludes(3), "#luckShine3", removeElement],
  [luckDeltaNotIncludes(2), "#luckShine2", removeElement],
  [luckDeltaNotIncludes(1), "#luckShine1", removeElement],

  [experienceDeltaNotIncludes(5), "#experienceUp5", removeElement],
  [experienceDeltaNotIncludes(4), "#experienceUp4", removeElement],
  [experienceDeltaNotIncludes(3), "#experienceUp3", removeElement],
  [experienceDeltaNotIncludes(2), "#experienceUp2", removeElement],
  [experienceDeltaNotIncludes(1), "#experienceUp1", removeElement],

  [notStableAlive(), "#healthIcon", removeElement],
  [notUnstableAlive(), "#healthLowIcon", removeElement],
  [notDead(), "#healthEmptyIcon", removeElement],
  [notDead(), "#characterDyingFace", removeElement],
  [dead(), "#characterFaceImage", removeElement]
]

export async function renderStatus(svgTemplate: string, status: GameStatusWithPortrait): Promise<Buffer> {
  const dom = new JSDOM(svgTemplate, {
    contentType: "image/svg+xml",
    pretendToBeVisual: false,
    includeNodeLocations: false,
    url: "https://localhost/status.xml"
  })
  for (const [filter, selector, action] of mappings) {
    if (filter(status)) {
      for (const el of dom.window.document.querySelectorAll(selector)) {
        action(el)
      }
    }
  }
  const resvg = new Resvg(dom.window.document.documentElement.outerHTML, {})
  resvg.resolveImage("https://invalid.invalid/face.png", status.portrait)
  return resvg.render().asPng()
}