import { resolve } from "node:path";
import { describe, expect, it } from "vitest";
import {
  createEngine,
  GrowthSystem,
  type CropDef,
  type CropDrop,
  type InventorySystem,
  type PlotEntity,
  type PlantingSystem,
} from "../src/index.js";

const repoRoot = resolve(process.cwd(), "../..");
const contentDir = resolve(repoRoot, "content");
const modsDir = resolve(repoRoot, "mods");

function engineSetup() {
  return createEngine({ contentDir, modsDir });
}

function plantingOf(engine: ReturnType<typeof createEngine>): PlantingSystem {
  const planting = engine.systems.get<PlantingSystem>("planting");
  if (!planting) throw new Error("planting system not booted");
  return planting;
}

function growthOf(engine: ReturnType<typeof createEngine>): GrowthSystem {
  const growth = engine.systems.get<GrowthSystem>("growth");
  if (!growth) throw new Error("growth system not booted");
  return growth;
}

function inventoryOf(engine: ReturnType<typeof createEngine>): InventorySystem {
  const inv = engine.systems.get<InventorySystem>("inventory");
  if (!inv) throw new Error("inventory system not booted");
  return inv;
}

describe("PlantingSystem", () => {
  it("till creates a tilled plot entity on the tile", async () => {
    const engine = engineSetup();
    await engine.start();
    try {
      const plot = plantingOf(engine).till(3, 3);
      expect(plot).toEqual({ id: "plot:3:3", type: "plot", x: 3, y: 3, tilled: true, watered: false });
      expect(engine.world.get("plot:3:3")).toBeDefined();
      expect(engine.world.query({ type: "plot" }).map((e) => e.id)).toEqual(["plot:3:3"]);
    } finally {
      await engine.stop();
    }
  });

  it("till is idempotent: re-tilling returns the same plot", async () => {
    const engine = engineSetup();
    await engine.start();
    try {
      const first = plantingOf(engine).till(1, 1);
      const second = plantingOf(engine).till(1, 1);
      expect(second).toBe(first);
      expect(engine.world.query({ type: "plot" })).toHaveLength(1);
    } finally {
      await engine.stop();
    }
  });

  it("till rejects non-integer or negative coordinates", async () => {
    const engine = engineSetup();
    await engine.start();
    try {
      const planting = plantingOf(engine);
      expect(() => planting.till(-1, 0)).toThrow(/non-negative integers/);
      expect(() => planting.till(1.5, 0)).toThrow(/non-negative integers/);
    } finally {
      await engine.stop();
    }
  });

  it("sow on an untilled tile throws", async () => {
    const engine = engineSetup();
    await engine.start();
    try {
      engine.world.create({ id: "plot:5:5", type: "plot", x: 5, y: 5, tilled: false, watered: false });
      expect(() => plantingOf(engine).sow(5, 5, "parsnip-seed")).toThrow(/not tilled/);
      expect(() => plantingOf(engine).sow(6, 6, "parsnip-seed")).toThrow(/no plot at/);
    } finally {
      await engine.stop();
    }
  });

  it("sow with a non-seed item throws", async () => {
    const engine = engineSetup();
    await engine.start();
    try {
      plantingOf(engine).till(3, 3);
      expect(() => plantingOf(engine).sow(3, 3, "hoe")).toThrow(/not a seed/);
    } finally {
      await engine.stop();
    }
  });

  it("sow with an unknown item throws", async () => {
    const engine = engineSetup();
    await engine.start();
    try {
      plantingOf(engine).till(3, 3);
      expect(() => plantingOf(engine).sow(3, 3, "nope")).toThrow(/unknown item: nope/);
    } finally {
      await engine.stop();
    }
  });

  it("sow with a seed that has no crop def throws", async () => {
    const engine = engineSetup();
    await engine.start();
    try {
      engine.registry.register("item", { id: "orphan-seed", name: "Orphan Seed", kind: "seed", stackable: true });
      plantingOf(engine).till(3, 3);
      expect(() => plantingOf(engine).sow(3, 3, "orphan-seed")).toThrow(/no crop registered for seed: orphan-seed/);
    } finally {
      await engine.stop();
    }
  });

  it("sow consumes one seed from inventory and plants the crop at stage 0", async () => {
    const engine = engineSetup();
    await engine.start();
    try {
      inventoryOf(engine).give("parsnip-seed", 3);
      plantingOf(engine).till(3, 3);
      const plot = plantingOf(engine).sow(3, 3, "parsnip-seed");
      expect(plot).toMatchObject({
        id: "plot:3:3",
        cropItemId: "parsnip",
        stageIndex: 0,
        daysInStage: 0,
        watered: false,
      });
      expect(inventoryOf(engine).count("parsnip-seed")).toBe(2);
    } finally {
      await engine.stop();
    }
  });

  it("sow without seeds in inventory throws and plants nothing", async () => {
    const engine = engineSetup();
    await engine.start();
    try {
      plantingOf(engine).till(3, 3);
      expect(() => plantingOf(engine).sow(3, 3, "parsnip-seed")).toThrow(/no parsnip-seed in inventory/);
      const plot = engine.world.get("plot:3:3") as PlotEntity;
      expect(plot.cropItemId).toBeUndefined();
    } finally {
      await engine.stop();
    }
  });

  it("sow on an already-planted plot throws", async () => {
    const engine = engineSetup();
    await engine.start();
    try {
      inventoryOf(engine).give("parsnip-seed", 3);
      const planting = plantingOf(engine);
      planting.till(3, 3);
      planting.sow(3, 3, "parsnip-seed");
      expect(() => planting.sow(3, 3, "parsnip-seed")).toThrow(/already has a crop/);
    } finally {
      await engine.stop();
    }
  });

  it("water sets watered true; watering a missing tile throws", async () => {
    const engine = engineSetup();
    await engine.start();
    try {
      const planting = plantingOf(engine);
      planting.till(3, 3);
      expect(planting.water(3, 3).watered).toBe(true);
      expect(() => planting.water(5, 5)).toThrow(/no plot at/);
    } finally {
      await engine.stop();
    }
  });

  it("harvest before maturity throws", async () => {
    const engine = engineSetup();
    await engine.start();
    try {
      inventoryOf(engine).give("parsnip-seed", 3);
      const planting = plantingOf(engine);
      planting.till(3, 3);
      planting.sow(3, 3, "parsnip-seed");
      expect(() => planting.harvest(3, 3)).toThrow(/not mature/);
    } finally {
      await engine.stop();
    }
  });

  it("harvest at the final stage returns drops, clears the crop, grants inventory, and fires onCropHarvest", async () => {
    const engine = engineSetup();
    await engine.start();
    try {
      const harvested: unknown[] = [];
      engine.hooks.on("onCropHarvest", (ctx) => {
        harvested.push({ world: ctx.world.get("player")?.id, time: ctx.time.get().day });
      });

      const crop = engine.registry.get<CropDef>("crop", "parsnip");
      if (!crop) throw new Error("parsnip crop not loaded");
      const lastStage = crop.stages.length - 1;

      const inv = inventoryOf(engine);
      inv.give("parsnip-seed", 3);
      const planting = plantingOf(engine);
      planting.till(3, 3);
      planting.sow(3, 3, "parsnip-seed");
      growthOf(engine).forceStage("plot:3:3", lastStage);

      const drops = planting.harvest(3, 3);
      expect(drops).toEqual([{ itemId: "parsnip", qty: 1 }]);
      const plot = engine.world.get("plot:3:3") as PlotEntity;
      expect(plot.cropItemId).toBeUndefined();
      expect(plot.stageIndex).toBeUndefined();
      expect(plot.daysInStage).toBeUndefined();
      expect(plot.tilled).toBe(true);
      expect(plot.watered).toBe(false);
      expect(inv.count("parsnip")).toBe(1);
      expect(harvested).toEqual([{ world: "player", time: 1 }]);
    } finally {
      await engine.stop();
    }
  });

  it("harvest without a crop throws", async () => {
    const engine = engineSetup();
    await engine.start();
    try {
      plantingOf(engine).till(3, 3);
      expect(() => plantingOf(engine).harvest(3, 3)).toThrow(/has no crop/);
    } finally {
      await engine.stop();
    }
  });
});

describe("PlantingSystem drop determinism (D28)", () => {
  async function seededEngineSetup(seed: number): Promise<ReturnType<typeof createEngine>> {
    const engine = createEngine({ contentDir, modsDir, seed });
    await engine.start();
    engine.registry.register("item", { id: "lucky-seed", name: "Lucky Seed", kind: "seed", stackable: true });
    engine.registry.register("item", { id: "gold", name: "Gold", kind: "material", stackable: true });
    engine.registry.register("crop", {
      id: "lucky",
      seedItem: "lucky-seed",
      stages: [
        { name: "sprout", days: 1, waterRequired: false },
        { name: "mature", days: 1, waterRequired: false },
      ],
      seasons: ["spring"],
      drops: [{ itemId: "gold", qty: 1, chance: 0.5 }],
    });
    return engine;
  }

  it("harvest drop rolls are deterministic across same-seed engines (drawn from ctx.rng)", async () => {
    const engineA = await seededEngineSetup(555);
    const engineB = await seededEngineSetup(555);
    try {
      const harvest = (engine: ReturnType<typeof createEngine>): CropDrop[] => {
        inventoryOf(engine).give("lucky-seed", 3);
        const planting = plantingOf(engine);
        planting.till(2, 2);
        planting.sow(2, 2, "lucky-seed");
        growthOf(engine).forceStage("plot:2:2", 1);
        return planting.harvest(2, 2);
      };
      expect(harvest(engineA)).toEqual(harvest(engineB));
      expect(engineA.rng.state().calls).toBe(1);
      expect(engineB.rng.state().calls).toBe(1);
      expect(inventoryOf(engineA).count("gold")).toBe(inventoryOf(engineB).count("gold"));
    } finally {
      await engineA.stop();
      await engineB.stop();
    }
  });
});

describe("GrowthSystem", () => {
  it("step advances a watered crop through stages and fires onCropGrow per day boundary", async () => {
    const engine = engineSetup();
    await engine.start();
    try {
      const grew: number[] = [];
      engine.hooks.on("onCropGrow", (ctx) => {
        const plot = ctx.world.query({ type: "plot" })[0] as PlotEntity | undefined;
        grew.push(plot?.stageIndex ?? -1);
      });

      inventoryOf(engine).give("parsnip-seed", 3);
      const planting = plantingOf(engine);
      planting.till(3, 3);
      planting.sow(3, 3, "parsnip-seed");
      planting.water(3, 3);

      const growth = growthOf(engine);
      growth.step(480);
      expect(grew).toEqual([]);
      let plot = engine.world.get("plot:3:3") as PlotEntity;
      expect(plot.stageIndex).toBe(0);
      expect(plot.daysInStage).toBe(1);

      planting.water(3, 3);
      growth.step(480);
      plot = engine.world.get("plot:3:3") as PlotEntity;
      expect(plot.stageIndex).toBe(1);
      expect(plot.daysInStage).toBe(0);
      expect(plot.watered).toBe(false);
      expect(grew).toEqual([1]);
    } finally {
      await engine.stop();
    }
  });

  it("step does not advance an unwatered crop when the stage requires water", async () => {
    const engine = engineSetup();
    await engine.start();
    try {
      inventoryOf(engine).give("parsnip-seed", 3);
      const planting = plantingOf(engine);
      planting.till(3, 3);
      planting.sow(3, 3, "parsnip-seed");

      const growth = growthOf(engine);
      growth.step(480);
      growth.step(480);
      growth.step(480);
      const plot = engine.world.get("plot:3:3") as PlotEntity;
      expect(plot.stageIndex).toBe(0);
      expect(plot.daysInStage).toBe(0);
    } finally {
      await engine.stop();
    }
  });

  it("step to maturity (final stage) then a watered crop stops progressing", async () => {
    const engine = engineSetup();
    await engine.start();
    try {
      const grew: number[] = [];
      engine.hooks.on("onCropGrow", (ctx) => {
        const plot = ctx.world.query({ type: "plot" })[0] as PlotEntity | undefined;
        grew.push(plot?.stageIndex ?? -1);
      });

      inventoryOf(engine).give("parsnip-seed", 3);
      const planting = plantingOf(engine);
      planting.till(3, 3);
      planting.sow(3, 3, "parsnip-seed");
      const growth = growthOf(engine);

      planting.water(3, 3);
      growth.step(480);
      planting.water(3, 3);
      growth.step(480);
      planting.water(3, 3);
      growth.step(480);
      planting.water(3, 3);
      growth.step(480);
      planting.water(3, 3);
      growth.step(480);
      planting.water(3, 3);
      growth.step(480);

      const plot = engine.world.get("plot:3:3") as PlotEntity;
      expect(plot.stageIndex).toBe(2);
      expect(grew).toEqual([1, 2]);
    } finally {
      await engine.stop();
    }
  });

  it("forceStage jumps a plot to a stage, fires onCropGrow, and rejects bad indices", async () => {
    const engine = engineSetup();
    await engine.start();
    try {
      const grew: number[] = [];
      engine.hooks.on("onCropGrow", (ctx) => {
        const plot = ctx.world.query({ type: "plot" })[0] as PlotEntity | undefined;
        grew.push(plot?.stageIndex ?? -1);
      });

      inventoryOf(engine).give("parsnip-seed", 3);
      const planting = plantingOf(engine);
      planting.till(3, 3);
      planting.sow(3, 3, "parsnip-seed");

      const growth = growthOf(engine);
      const plot = growth.forceStage("plot:3:3", 2);
      expect(plot.stageIndex).toBe(2);
      expect(plot.daysInStage).toBe(0);
      expect(grew).toEqual([2]);

      expect(() => growth.forceStage("plot:3:3", 5)).toThrow(/out of range/);
      expect(() => growth.forceStage("plot:9:9", 0)).toThrow(/no plot found/);
      expect(() => growth.forceStage("plot:3:3", -1)).toThrow(/out of range/);
    } finally {
      await engine.stop();
    }
  });
});