import { describe, it, expect, beforeAll } from 'vitest';
import { existsSync } from 'node:fs';
import { resolve } from 'node:path';
import { Story } from 'inkjs';
import {
  loadInkStory,
  bindGardenStateToInk,
  INK_VARIABLE_MAP,
} from './ink-loader';
import type { AppStoreShape } from '../store';

/**
 * Phase 2 Plan 02-04 Task 1 sanity tests for the Ink runtime loader.
 *
 * Precondition (W9): the test file does NOT call compileAllInk() —
 * concurrent invocations of the compile script would race on the
 * src/content/compiled-ink/ wipe step. Instead, we assert the compiled
 * artefacts exist and surface a clear fix-it message if they don't. The
 * `npm run ci` chain runs `compile:ink` BEFORE `test`, so the artefact
 * is always present in CI.
 *
 * The `compiledExists` check happens INSIDE beforeAll (not at module
 * eval) because compile-ink.test.mjs may wipe + regenerate the
 * compiled-ink/ directory at test-execution time. Reading existsSync at
 * module eval would race with that test file's wipe step.
 */
beforeAll(() => {
  const compiledExists = existsSync(
    resolve(process.cwd(), 'src/content/compiled-ink/season1/lura-arrival.ink.json'),
  );
  if (!compiledExists) {
    throw new Error(
      'ink-loader.test.ts: compiled Ink JSON missing. Run `npm run compile:ink` (or `npm run build`) before this suite.',
    );
  }
});

function emptySnapshot(overrides: Partial<AppStoreShape> = {}): AppStoreShape {
  return {
    // GardenSlice
    tiles: new Array(16).fill(null),
    unlockedPlantTypes: ['rosemary'],
    tickCount: 0,
    lastTickAt: 0,
    pendingCommands: [],
    enqueueCommand: () => {},
    drainCommands: () => [],
    applyTilesAndUnlocks: () => {},
    setTickCount: () => {},
    setLastTickAt: () => {},
    // MemorySlice
    harvestedFragmentIds: [],
    fragmentRevealId: null,
    setHarvested: () => {},
    setFragmentRevealId: () => {},
    // NarrativeSlice
    luraBeatProgress: { arrived: false, mid: false, farewell: false, pending: null },
    dialogueOverlayOpen: false,
    setLuraBeatProgress: () => {},
    setDialogueOverlayOpen: () => {},
    // SessionSlice
    beginGateDismissed: false,
    persistenceToastShown: false,
    letterOverlayOpen: false,
    pendingLetterEventBlock: null,
    dismissBeginGate: () => {},
    setPersistenceToastShown: () => {},
    openLetter: () => {},
    dismissLetter: () => {},
    ...(overrides as Partial<AppStoreShape>),
  } as AppStoreShape;
}

describe('loadInkStory', () => {
  it('returns an inkjs Story instance for lura-arrival', async () => {
    const story = await loadInkStory('lura-arrival');
    expect(story).toBeInstanceOf(Story);
  });

  it('returns an inkjs Story instance for compost-acknowledgements', async () => {
    const story = await loadInkStory('compost-acknowledgements');
    expect(story).toBeInstanceOf(Story);
  });

  it('returns an inkjs Story instance for lura-mid + lura-farewell', async () => {
    const m = await loadInkStory('lura-mid');
    const f = await loadInkStory('lura-farewell');
    expect(m).toBeInstanceOf(Story);
    expect(f).toBeInstanceOf(Story);
  });
});

describe('bindGardenStateToInk', () => {
  it('sets fragment_count on a story that declares the VAR', async () => {
    const story = await loadInkStory('lura-arrival');
    const snap = emptySnapshot({ harvestedFragmentIds: ['a', 'b', 'c'] });
    bindGardenStateToInk(story, snap);
    // Read back via the same variablesState surface to confirm the bind landed.
    const value = (
      story.variablesState as unknown as Record<string, unknown>
    )['fragment_count'];
    expect(value).toBe(3);
  });

  it('does NOT throw when binding to a story missing some variables (compost has only fragment_count)', async () => {
    const story = await loadInkStory('compost-acknowledgements');
    const snap = emptySnapshot({ harvestedFragmentIds: ['a', 'b'] });
    expect(() => bindGardenStateToInk(story, snap)).not.toThrow();
    // fragment_count was declared and should be set.
    const fc = (
      story.variablesState as unknown as Record<string, unknown>
    )['fragment_count'];
    expect(fc).toBe(2);
  });

  it('sets last_plant_type to empty string when there are no harvests', async () => {
    const story = await loadInkStory('lura-arrival');
    const snap = emptySnapshot({ harvestedFragmentIds: [] });
    bindGardenStateToInk(story, snap);
    const lpt = (
      story.variablesState as unknown as Record<string, unknown>
    )['last_plant_type'];
    expect(lpt).toBe('');
  });
});

describe('INK_VARIABLE_MAP (Pitfall 4 — snake_case mandatory)', () => {
  it('every key is snake_case (lowercase letters + underscores only)', () => {
    const keys = Object.keys(INK_VARIABLE_MAP);
    expect(keys.length).toBeGreaterThan(0);
    for (const key of keys) {
      expect(key).toMatch(/^[a-z][a-z_]*$/);
    }
  });

  it('declares the three Phase-2 slots', () => {
    const keys = Object.keys(INK_VARIABLE_MAP);
    expect(keys).toContain('fragment_count');
    expect(keys).toContain('last_plant_type');
    expect(keys).toContain('last_fragment_title');
  });
});