/* eslint-disable max-lines-per-function -- Test suites naturally have many cases */
/* eslint-disable max-lines -- Test suites naturally have many cases */
/* eslint-disable @typescript-eslint/consistent-type-assertions -- Tests build minimal state objects */
import { describe, expect, it } from "vitest";
import {
  buildPostPrestigeState,
  calculateMilestoneBonus,
  calculatePrestigeThreshold,
  calculateProductionMultiplier,
  calculateRunestones,
  computeRunestoneMultipliers,
  isEligibleForPrestige,
} from "../../src/services/prestige.js";
import type { GameState } from "@elysium/types";

const makePlayer = (
  totalGoldEarned: number,
  lifetimeGoldEarned = 0,
  totalClicks = 0,
) => ({
  avatar:                       null,
  characterName:                "Tester",
  discordId:                    "test_id",
  discriminator:                "0",
  lifetimeAchievementsUnlocked: 0,
  lifetimeAdventurersRecruited: 0,
  lifetimeBossesDefeated:       0,
  lifetimeClicks:               0,
  lifetimeGoldEarned:           lifetimeGoldEarned,
  lifetimeQuestsCompleted:      0,
  totalClicks:                  totalClicks,
  totalGoldEarned:              totalGoldEarned,
  username:                     "testuser",
});

const makeMinimalState = (overrides: Partial<GameState> = {}): GameState =>
  ({
    player: makePlayer(0),
    resources: { gold: 0, essence: 0, crystals: 0, runestones: 0 },
    adventurers: [],
    upgrades: [],
    quests: [],
    bosses: [],
    equipment: [],
    achievements: [],
    zones: [],
    exploration: { areas: [], materials: [], craftedRecipeIds: [], craftedGoldMultiplier: 1, craftedEssenceMultiplier: 1, craftedClickMultiplier: 1, craftedCombatMultiplier: 1 },
    companions: { unlockedCompanionIds: [], activeCompanionId: null },
    prestige: { count: 0, runestones: 0, productionMultiplier: 1, purchasedUpgradeIds: [] },
    baseClickPower: 1,
    lastTickAt: 0,
    schemaVersion: 1,
    ...overrides,
  } as GameState);

describe("calculatePrestigeThreshold", () => {
  it("returns base threshold at count 0", () => {
    expect(calculatePrestigeThreshold(0)).toBe(1_000_000);
  });

  it("returns 5× at count 1", () => {
    expect(calculatePrestigeThreshold(1)).toBe(5_000_000);
  });

  it("returns 25× at count 2", () => {
    expect(calculatePrestigeThreshold(2)).toBe(25_000_000);
  });

  it("applies threshold multiplier correctly", () => {
    expect(calculatePrestigeThreshold(0, 2)).toBe(2_000_000);
  });
});

describe("isEligibleForPrestige", () => {
  it("returns true when totalGoldEarned meets threshold", () => {
    const state = makeMinimalState({ player: makePlayer(1_000_000) });
    expect(isEligibleForPrestige(state)).toBe(true);
  });

  it("returns false when totalGoldEarned is below threshold", () => {
    const state = makeMinimalState({ player: makePlayer(999_999) });
    expect(isEligibleForPrestige(state)).toBe(false);
  });

  it("uses echoPrestigeThresholdMultiplier from transcendence when present", () => {
    const state = makeMinimalState({
      player: makePlayer(2_000_000),
      transcendence: {
        count: 1, echoes: 0, purchasedUpgradeIds: [],
        echoIncomeMultiplier: 1, echoCombatMultiplier: 1,
        echoPrestigeThresholdMultiplier: 2,
        echoPrestigeRunestoneMultiplier: 1, echoMetaMultiplier: 1,
      },
    });
    // threshold = 1_000_000 × 2 = 2_000_000 — exactly meets
    expect(isEligibleForPrestige(state)).toBe(true);
  });
});

describe("calculateRunestones", () => {
  it("calculates basic runestones formula", () => {
    // floor(sqrt(4_000_000 / 1_000_000)) × 10 = floor(2) × 10 = 20
    const result = calculateRunestones({ totalGoldEarned: 4_000_000, prestigeCount: 0, purchasedUpgradeIds: [] });
    expect(result).toBe(20);
  });

  it("applies echo runestone multiplier", () => {
    // floor(sqrt(4) × 10) = 20; × 2 = 40
    const result = calculateRunestones({ totalGoldEarned: 4_000_000, prestigeCount: 0, purchasedUpgradeIds: [], echoRunestoneMultiplier: 2 });
    expect(result).toBe(40);
  });

  it("applies purchased runestone upgrade multiplier", () => {
    // With "runestones_1" purchased (multiplier 1.25): floor(20 × 1.25) = 25
    const result = calculateRunestones({ totalGoldEarned: 4_000_000, prestigeCount: 0, purchasedUpgradeIds: ["runestone_gain_1"] });
    expect(result).toBeGreaterThan(20);
  });
});

describe("calculateProductionMultiplier", () => {
  it("returns 1 at count 0", () => {
    expect(calculateProductionMultiplier(0)).toBe(1);
  });

  it("returns 1.15 at count 1", () => {
    expect(calculateProductionMultiplier(1)).toBeCloseTo(1.15);
  });

  it("scales exponentially", () => {
    expect(calculateProductionMultiplier(10)).toBeCloseTo(Math.pow(1.15, 10));
  });
});

describe("calculateMilestoneBonus", () => {
  it("returns 0 for non-milestone prestiges", () => {
    expect(calculateMilestoneBonus(1)).toBe(0);
    expect(calculateMilestoneBonus(3)).toBe(0);
    expect(calculateMilestoneBonus(4)).toBe(0);
  });

  it("returns 25 at prestige 5", () => {
    expect(calculateMilestoneBonus(5)).toBe(25);
  });

  it("returns 50 at prestige 10", () => {
    expect(calculateMilestoneBonus(10)).toBe(50);
  });

  it("returns 75 at prestige 15", () => {
    expect(calculateMilestoneBonus(15)).toBe(75);
  });
});

describe("computeRunestoneMultipliers", () => {
  it("returns all 1s with empty ids", () => {
    const result = computeRunestoneMultipliers([]);
    expect(result.runestonesIncomeMultiplier).toBe(1);
    expect(result.runestonesClickMultiplier).toBe(1);
    expect(result.runestonesEssenceMultiplier).toBe(1);
    expect(result.runestonesCrystalMultiplier).toBe(1);
  });

  it("applies income upgrade when purchased", () => {
    const result = computeRunestoneMultipliers(["income_1"]);
    expect(result.runestonesIncomeMultiplier).toBeGreaterThan(1);
    expect(result.runestonesClickMultiplier).toBe(1);
  });

  it("applies click upgrade when purchased", () => {
    const result = computeRunestoneMultipliers(["click_power_1"]);
    expect(result.runestonesClickMultiplier).toBeGreaterThan(1);
    expect(result.runestonesIncomeMultiplier).toBe(1);
  });

  it("applies essence upgrade when purchased", () => {
    const result = computeRunestoneMultipliers(["essence_1"]);
    expect(result.runestonesEssenceMultiplier).toBeGreaterThan(1);
  });

  it("applies crystals upgrade when purchased", () => {
    const result = computeRunestoneMultipliers(["crystal_1"]);
    expect(result.runestonesCrystalMultiplier).toBeGreaterThan(1);
  });
});

describe("buildPostPrestigeState", () => {
  it("increments prestige count", () => {
    const state = makeMinimalState({ player: makePlayer(4_000_000) });
    const { prestigeData } = buildPostPrestigeState(state, "Tester");
    expect(prestigeData.count).toBe(1);
  });

  it("sums runestones earned", () => {
    const state = makeMinimalState({ player: makePlayer(4_000_000) });
    const { prestigeData, runestonesEarned } = buildPostPrestigeState(state, "Tester");
    expect(runestonesEarned).toBeGreaterThan(0);
    expect(prestigeData.runestones).toBe(runestonesEarned);
  });

  it("adds milestone runestones at prestige 5", () => {
    const state = makeMinimalState({
      player: makePlayer(100_000_000),
      prestige: { count: 4, runestones: 0, productionMultiplier: 1, purchasedUpgradeIds: [] },
    });
    const { milestoneRunestones } = buildPostPrestigeState(state, "Tester");
    expect(milestoneRunestones).toBe(25);
  });

  it("persists codex from current state", () => {
    const codex = { entries: [{ id: "e1", unlockedAt: 1000, sourceType: "exploration" as const }] };
    const state = makeMinimalState({ codex });
    const { prestigeState } = buildPostPrestigeState(state, "Tester");
    expect(prestigeState.codex).toEqual(codex);
  });

  it("persists story from current state", () => {
    const story = { unlockedChapterIds: ["ch1"], completedChapters: [] };
    const state = makeMinimalState({ story });
    const { prestigeState } = buildPostPrestigeState(state, "Tester");
    expect(prestigeState.story).toEqual(story);
  });

  it("persists transcendence from current state", () => {
    const transcendence = {
      count: 1, echoes: 10, purchasedUpgradeIds: [],
      echoIncomeMultiplier: 1, echoCombatMultiplier: 1,
      echoPrestigeThresholdMultiplier: 1,
      echoPrestigeRunestoneMultiplier: 1, echoMetaMultiplier: 1,
    };
    const state = makeMinimalState({ transcendence });
    const { prestigeState } = buildPostPrestigeState(state, "Tester");
    expect(prestigeState.transcendence).toEqual(transcendence);
  });

  it("preserves autoPrestigeEnabled when set", () => {
    const state = makeMinimalState({
      prestige: { count: 0, runestones: 0, productionMultiplier: 1, purchasedUpgradeIds: [], autoPrestigeEnabled: true },
    });
    const { prestigeData } = buildPostPrestigeState(state, "Tester");
    expect(prestigeData.autoPrestigeEnabled).toBe(true);
  });

  it("omits autoPrestigeEnabled when not set", () => {
    const state = makeMinimalState();
    const { prestigeData } = buildPostPrestigeState(state, "Tester");
    expect(prestigeData.autoPrestigeEnabled).toBeUndefined();
  });

  it("preserves apotheosis data across prestige", () => {
    const apotheosis = { count: 2 };
    const state = makeMinimalState({ apotheosis });
    const { prestigeState } = buildPostPrestigeState(state, "Tester");
    expect(prestigeState.apotheosis).toEqual(apotheosis);
  });

  it("accumulates current-run gold into lifetime total", () => {
    const state = makeMinimalState({
      player: makePlayer(4_000_000, 1_000_000),
    });
    const { prestigeState } = buildPostPrestigeState(state, "Tester");
    expect(prestigeState.player.lifetimeGoldEarned).toBe(5_000_000);
  });

  it("accumulates current-run clicks into lifetime total", () => {
    const state = makeMinimalState({
      player: makePlayer(4_000_000, 0, 500),
    });
    const { prestigeState } = buildPostPrestigeState(state, "Tester");
    expect(prestigeState.player.lifetimeClicks).toBe(500);
  });

  it("accumulates defeated bosses into lifetime total", () => {
    const defeatedBoss = {
      bountyRunestones:    0,
      crystalReward:       0,
      currentHp:           0,
      damagePerSecond:     10,
      description:         "A boss",
      equipmentRewards:    [] as string[],
      essenceReward:       0,
      goldReward:          100,
      id:                  "boss_1",
      maxHp:               100,
      name:                "Boss One",
      prestigeRequirement: 0,
      status:              "defeated" as const,
      upgradeRewards:      [] as string[],
      zoneId:              "zone_1",
    };
    const state = makeMinimalState({ bosses: [ defeatedBoss ] });
    const { prestigeState } = buildPostPrestigeState(state, "Tester");
    expect(prestigeState.player.lifetimeBossesDefeated).toBe(1);
  });

  it("preserves bountyRunestonesClaimed flag on bosses across prestige", () => {
    const claimedBoss = {
      bountyRunestones:        5,
      bountyRunestonesClaimed: true,
      crystalReward:           0,
      currentHp:               0,
      damagePerSecond:         10,
      description:             "A boss",
      equipmentRewards:        [] as string[],
      essenceReward:           0,
      goldReward:              100,
      id:                      "troll_king",
      maxHp:                   100,
      name:                    "Troll King",
      prestigeRequirement:     0,
      status:                  "defeated" as const,
      upgradeRewards:          [] as string[],
      zoneId:                  "verdant_vale",
    };
    const state = makeMinimalState({ bosses: [ claimedBoss ] as GameState["bosses"] });
    const { prestigeState } = buildPostPrestigeState(state, "Tester");
    const matchingBoss = prestigeState.bosses.find((boss) => {
      return boss.id === "troll_king";
    });
    expect(matchingBoss?.bountyRunestonesClaimed).toBe(true);
  });

  it("accumulates completed quests into lifetime total", () => {
    const quest = {
      id:          "q_1",
      name:        "A Quest",
      description: "Do the thing",
      status:      "completed" as const,
      zoneId:      "zone_1",
    };
    const state = makeMinimalState({ quests: [ quest ] as GameState["quests"] });
    const { prestigeState } = buildPostPrestigeState(state, "Tester");
    expect(prestigeState.player.lifetimeQuestsCompleted).toBe(1);
  });

  it("accumulates recruited adventurers into lifetime total", () => {
    const adventurer = {
      combatPower:       10,
      count:             5,
      essencePerSecond:  0,
      goldPerSecond:     1,
      id:                "adv_1",
      level:             1,
      unlocked:          true,
    };
    const state = makeMinimalState({ adventurers: [ adventurer ] as GameState["adventurers"] });
    const { prestigeState } = buildPostPrestigeState(state, "Tester");
    expect(prestigeState.player.lifetimeAdventurersRecruited).toBe(5);
  });

  it("preserves achievements from current state across prestige", () => {
    const achievement = {
      description: "Did a thing",
      id:          "ach_persisted",
      name:        "Achiever",
      requirement: 1,
      type:        "totalClicks" as const,
      unlockedAt:  Date.now(),
    };
    const state = makeMinimalState({ achievements: [ achievement ] as GameState["achievements"] });
    const { prestigeState } = buildPostPrestigeState(state, "Tester");
    expect(prestigeState.achievements).toEqual([ achievement ]);
  });

  it("accumulates unlocked achievements into lifetime total", () => {
    const achievement = {
      description: "Did a thing",
      id:          "ach_1",
      name:        "Achiever",
      requirement: 1,
      type:        "totalClicks" as const,
      unlockedAt:  Date.now(),
    };
    const state = makeMinimalState({ achievements: [ achievement ] as GameState["achievements"] });
    const { prestigeState } = buildPostPrestigeState(state, "Tester");
    expect(prestigeState.player.lifetimeAchievementsUnlocked).toBe(1);
  });
});