import { Creature, POV, Entity } from './entity'
import { POVPair, POVPairArgs, TextLike, DynText, LiveText } from './language'
import { Container } from './vore'
import { LogEntry, LogLines, CompositeLog, FAElem, LogLine, FormatEntry, FormatOpt, PropElem } from './interface'
import { StatTest, StatVigorTest } from './combat/tests'

export enum DamageType {
  Pierce = "Pierce",
  Slash = "Slash",
  Crush = "Crush",
  Acid = "Acid",
  Seduction = "Seduction",
  Dominance = "Dominance"
}

export interface DamageInstance {
  type: DamageType;
  amount: number;
  target: Vigor;
}

export enum Vigor {
  Health = "Health",
  Stamina = "Stamina",
  Resolve = "Resolve"
}

export const VigorIcons: {[key in Vigor]: string} = {
  Health: "fas fa-heart",
  Stamina: "fas fa-bolt",
  Resolve: "fas fa-brain"
}

export const VigorDescs: {[key in Vigor]: string} = {
  Health: "How much damage you can take",
  Stamina: "How much energy you have",
  Resolve: "How much dominance you can resist"
}

export type Vigors = {[key in Vigor]: number}

export enum Stat {
  Toughness = "Toughness",
  Power = "Power",
  Speed = "Speed",
  Willpower = "Willpower",
  Charm = "Charm"
}

export type Stats = {[key in Stat]: number}

export const StatIcons: {[key in Stat]: string} = {
  Toughness: 'fas fa-heartbeat',
  Power: 'fas fa-fist-raised',
  Speed: 'fas fa-feather',
  Willpower: 'fas fa-book',
  Charm: 'fas fa-comments'
}

export const StatDescs: {[key in Stat]: string} = {
  Toughness: 'Your physical resistance',
  Power: 'Your physical power',
  Speed: 'How quickly you can act',
  Willpower: 'Your mental resistance',
  Charm: 'Your mental power'
}

export enum VoreStat {
  Mass = "Mass",
  Bulk = "Bulk",
  PreyCount = "Prey Count"
}

export type VoreStats = {[key in VoreStat]: number}

export const VoreStatIcons: {[key in VoreStat]: string} = {
  [VoreStat.Mass]: "fas fa-weight",
  [VoreStat.Bulk]: "fas fa-weight-hanging",
  [VoreStat.PreyCount]: "fas fa-utensils"
}

export const VoreStatDescs: {[key in VoreStat]: string} = {
  [VoreStat.Mass]: "How much you weigh",
  [VoreStat.Bulk]: "Your weight, plus the weigh of your prey",
  [VoreStat.PreyCount]: "How many creatures you've got inside of you"
}

export interface CombatTest {
  test: (user: Creature, target: Creature) => boolean;
  odds: (user: Creature, target: Creature) => number;
  explain: (user: Creature, target: Creature) => LogEntry;
}

export interface Effect {
  name: string;
  desc: string;
  apply: (target: Creature) => LogEntry;
}

/**
 * An instance of damage. Contains zero or more [[DamageInstance]] objects
 */
export class Damage {
  readonly damages: DamageInstance[]

  constructor (...damages: DamageInstance[]) {
    this.damages = damages
  }

  scale (factor: number): Damage {
    const results: Array<DamageInstance> = []

    this.damages.forEach(damage => {
      results.push({
        type: damage.type,
        amount: damage.amount * factor,
        target: damage.target
      })
    })

    return new Damage(...results)
  }

  toString (): string {
    return this.damages.map(damage => damage.amount + " " + damage.type).join("/")
  }

  render (): LogEntry {
    return new LogLine(...this.damages.flatMap(instance => {
      return [instance.amount.toString(), new FAElem(VigorIcons[instance.target]), " " + instance.type]
    }))
  }

  renderShort (): LogEntry {
    const totals: Vigors = Object.keys(Vigor).reduce((total: any, key) => { total[key] = 0; return total }, {})

    this.damages.forEach(instance => {
      totals[instance.target] += instance.amount
    })

    return new FormatEntry(new LogLine(...Object.keys(Vigor).flatMap(key => totals[key as Vigor] === 0 ? [] : [new PropElem(key as Vigor, totals[key as Vigor]), ' '])), FormatOpt.DamageInst)
  }
}

/**
 * Computes damage given the source and target of the damage.
 */
export interface DamageFormula {
  calc (user: Creature, target: Creature): Damage;
  describe (user: Creature, target: Creature): LogEntry;
}

/**
 * Simply returns the damage it was given.
 */
export class ConstantDamageFormula implements DamageFormula {
  calc (user: Creature, target: Creature): Damage {
    return this.damage
  }

  constructor (private damage: Damage) {

  }

  describe (user: Creature, target: Creature): LogEntry {
    return new LogLine('Deal ', this.damage.renderShort(), ' damage')
  }
}

/**
 * Randomly scales the damage it was given with a factor of (1-x) to (1+x)
 */
export class UniformRandomDamageFormula implements DamageFormula {
  calc (user: Creature, target: Creature): Damage {
    return this.damage.scale(Math.random() * this.variance * 2 - this.variance + 1)
  }

  constructor (private damage: Damage, private variance: number) {

  }

  describe (user: Creature, target: Creature): LogEntry {
    return new LogLine('Deal between ', this.damage.scale(1 - this.variance).renderShort(), ' and ', this.damage.scale(1 + this.variance).renderShort(), ' damage.')
  }
}

/**
 * A Combatant has a list of possible actions to take.
 *
 * This may be merged with [[Actionable]]
 */
export interface Combatant {
    actions: Array<Action>;
}

/**
 * An Action is anything that can be done by a [[Creature]] to a [[Creature]].
 */
export abstract class Action {
  allowed (user: Creature, target: Creature): boolean {
    return this.conditions.every(cond => cond.allowed(user, target))
  }

  abstract execute(user: Creature, target: Creature): LogEntry

  abstract describe (user: Creature, target: Creature): LogEntry

  constructor (public name: TextLike, public desc: TextLike, private conditions: Array<Condition> = []) {

  }

  toString (): string {
    return this.name.toString()
  }
}

/**
 * A Condition describes whether or not something is permissible between two [[Creature]]s
 */
export interface Condition {
  allowed: (user: Creature, target: Creature) => boolean;
}

export interface Actionable {
  actions: Array<Action>;
}

export abstract class SelfAction extends Action {
  allowed (user: Creature, target: Creature) {
    if (user === target) {
      return super.allowed(user, target)
    } else {
      return false
    }
  }
}

export abstract class PairAction extends Action {
  allowed (user: Creature, target: Creature) {
    if (user !== target) {
      return super.allowed(user, target)
    } else {
      return false
    }
  }
}

export abstract class TogetherAction extends PairAction {
  allowed (user: Creature, target: Creature) {
    if (user.containedIn === target.containedIn) {
      return super.allowed(user, target)
    } else {
      return false
    }
  }
}