import { readFileSync } from 'node:fs';

import { describe, expect, it } from 'vitest';

import type { GameCreationAppManifest } from '../../../packages/shared/src/contracts/gameCreationApp';
import {
  createProjectManifestMergeState,
  describeProjectManifestMergeRejection,
  mergeProjectManifestSnapshot,
  type ProjectManifestMergeRecoveryStage,
  projectManifestMergeRejectionDecision,
  type ProjectManifestSnapshot,
  rereadAuthoritativeProjectManifestSnapshot,
  resolveResourceFocusIntent,
  type ResourceFocusIntent,
} from '../src/view/project-development/projectResourceLiveUpdateModel';

function manifest(projectId: string, assetIds: string[] = []) {
  return {
    schemaVersion: 'game-creation-app.v1',
    projectId,
    name: projectId,
    tasks: [],
    assets: assetIds.map((id) => ({
      id,
      kind: 'asset',
      mediaType: 'image/png',
      localPath: `assets/${id}.png`,
      source: { kind: 'canvas' as const, taskId: null },
    })),
    versions: [],
  } as unknown as GameCreationAppManifest;
}

function snapshot(
  revision: number,
  source: ProjectManifestSnapshot['source'],
  assetIds: string[] = [],
): ProjectManifestSnapshot {
  const value = manifest('project-live', assetIds);
  return {
    projectPath: '/tmp/project-live',
    projectId: value.projectId,
    revision,
    manifest: value,
    source,
    commitId: assetIds.length > 0 ? `commit-${assetIds.at(-1)}` : undefined,
    eventId: source === 'asset-event' ? `event-${revision}` : undefined,
  };
}

function focusIntent(
  input?: Partial<ResourceFocusIntent>,
): ResourceFocusIntent {
  return {
    flowId: 'flow-1',
    saveAttemptId: 'save-1',
    sessionId: 'session-1',
    draftId: 'draft-1',
    commitId: 'commit-1',
    projectPath: '/tmp/project-live',
    projectId: 'project-live',
    focusGeneration: 3,
    resourceId: 'asset:new-art',
    completed: false,
    ...input,
  };
}

function focusEnvironment(
  input?: Partial<Parameters<typeof resolveResourceFocusIntent>[1]>,
) {
  return {
    projectPath: '/tmp/project-live',
    projectId: 'project-live',
    flowId: 'flow-1',
    focusGeneration: 3,
    projected: true,
    dependencyLayoutSettled: true,
    dependencyPositioned: true,
    typeLayoutSettled: true,
    typePositioned: true,
    visible: true,
    domRendered: true,
    ...input,
  };
}

describe('project resource live update model', () => {
  it('deduplicates command-first and event-first commit delivery', () => {
    const initial = createProjectManifestMergeState(snapshot(4, 'initial'));
    const command = snapshot(5, 'asset-command', ['new-art']);
    const event = {
      ...snapshot(5, 'asset-event', ['new-art']),
      eventId: 'event-5',
    };

    const commandFirst = mergeProjectManifestSnapshot(initial, command);
    expect(commandFirst.decision).toBe('accepted');
    const commandThenEvent = mergeProjectManifestSnapshot(
      commandFirst.state,
      event,
    );
    expect(commandThenEvent.decision).toBe('duplicate');
    expect(commandThenEvent.state.seenEventIds).toEqual(['event-5']);

    const eventFirst = mergeProjectManifestSnapshot(initial, event);
    expect(eventFirst.decision).toBe('accepted');
    expect(
      mergeProjectManifestSnapshot(eventFirst.state, command).decision,
    ).toBe('duplicate');
  });

  it('rejects an old poll and fails closed on a divergent equal revision', () => {
    const accepted = createProjectManifestMergeState(
      snapshot(8, 'asset-event', ['new-art']),
    );
    expect(
      mergeProjectManifestSnapshot(accepted, snapshot(7, 'poll')).decision,
    ).toBe('stale-revision');
    expect(
      mergeProjectManifestSnapshot(
        accepted,
        snapshot(8, 'poll', ['different-art']),
      ).decision,
    ).toBe('revision-conflict');
  });

  it('keeps project switching and user selection generations from stealing focus', () => {
    expect(
      resolveResourceFocusIntent(
        focusIntent(),
        focusEnvironment({ projectId: 'other-project' }),
      ),
    ).toBe('invalid');
    expect(
      resolveResourceFocusIntent(
        focusIntent(),
        focusEnvironment({ focusGeneration: 4 }),
      ),
    ).toBe('invalid');
  });

  it('lets only the latest consecutive save intent focus', () => {
    expect(
      resolveResourceFocusIntent(
        focusIntent({ flowId: 'flow-old', focusGeneration: 2 }),
        focusEnvironment(),
      ),
    ).toBe('invalid');
    expect(resolveResourceFocusIntent(focusIntent(), focusEnvironment())).toBe(
      'focus',
    );
  });

  it('distinguishes projection, both layouts, filtering, DOM and one-shot completion', () => {
    const intent = focusIntent();
    expect(
      resolveResourceFocusIntent(
        intent,
        focusEnvironment({ projected: false }),
      ),
    ).toBe('wait-projection');
    expect(
      resolveResourceFocusIntent(
        intent,
        focusEnvironment({ dependencyLayoutSettled: false }),
      ),
    ).toBe('wait-layout');
    expect(
      resolveResourceFocusIntent(
        intent,
        focusEnvironment({ typePositioned: false }),
      ),
    ).toBe('wait-layout');
    expect(
      resolveResourceFocusIntent(intent, focusEnvironment({ visible: false })),
    ).toBe('hidden');
    expect(
      resolveResourceFocusIntent(
        intent,
        focusEnvironment({ domRendered: false }),
      ),
    ).toBe('wait-dom');
    expect(resolveResourceFocusIntent(intent, focusEnvironment())).toBe(
      'focus',
    );
    expect(
      resolveResourceFocusIntent(
        { ...intent, completed: true },
        focusEnvironment(),
      ),
    ).toBe('completed');
  });

  it('does not implement the live completion path with reload or project reopen', () => {
    const source = readFileSync(
      new URL('../src/view/project-development/index.tsx', import.meta.url),
      'utf8',
    );
    expect(source).not.toMatch(/(?:location|window\.location)\.reload\s*\(/u);
    expect(source).not.toContain('open_local_game_project');
  });
});

describe('清单快照被拒收后的可见性与恢复', () => {
  function rereadInput(overrides: {
    projectPath?: string;
    projectId?: string;
    revisions?: number[];
    manifestProjectId?: string;
    readManifest?: () => Promise<GameCreationAppManifest>;
  }) {
    const revisions = [...(overrides.revisions ?? [4])];
    let manifestReads = 0;
    const order: string[] = [];
    const input = {
      projectPath: overrides.projectPath ?? '/tmp/project-live',
      projectId: overrides.projectId ?? 'project-live',
      readRevision: async () => {
        order.push('revision');
        return revisions.length > 1 ? revisions.shift()! : revisions[0]!;
      },
      readManifest: async () => {
        order.push('manifest');
        manifestReads += 1;
        const manifestProjectId = overrides.manifestProjectId ?? 'project-live';
        return (
          overrides.readManifest?.() ??
          Promise.resolve(manifest(manifestProjectId, ['new-art']))
        );
      },
    };
    return { input, order, manifestReads: () => manifestReads };
  }

  it('only treats the two decisions that lose an update as user-visible rejections', () => {
    // `/assets` 之类的路由命令不算拒收，不能弹提示。
    expect(projectManifestMergeRejectionDecision('accepted')).toBeNull();
    expect(projectManifestMergeRejectionDecision('duplicate')).toBeNull();
    expect(projectManifestMergeRejectionDecision('scope-mismatch')).toBeNull();
    expect(projectManifestMergeRejectionDecision('stale-revision')).toBe(
      'stale-revision',
    );
    expect(projectManifestMergeRejectionDecision('revision-conflict')).toBe(
      'revision-conflict',
    );
  });

  it('rereads the disk revision, manifest and revision again before adopting', async () => {
    const { input, order } = rereadInput({ revisions: [7] });
    const snapshotRead =
      await rereadAuthoritativeProjectManifestSnapshot(input);

    // 两次读 revision 夹一次读清单：只有版本号前后一致，这一对才配被采信。
    expect(order).toEqual(['revision', 'manifest', 'revision']);
    expect(snapshotRead).not.toBeNull();
    expect(snapshotRead).toMatchObject({
      projectPath: '/tmp/project-live',
      projectId: 'project-live',
      revision: 7,
      source: 'poll',
    });
    expect(snapshotRead?.manifest.assets.map((asset) => asset.id)).toEqual([
      'new-art',
    ]);
  });

  it('gives up when a write lands between the two revision reads', async () => {
    const { input } = rereadInput({ revisions: [7, 8] });
    expect(await rereadAuthoritativeProjectManifestSnapshot(input)).toBeNull();
  });

  it('refuses a manifest that belongs to another project', async () => {
    const { input } = rereadInput({
      revisions: [7],
      manifestProjectId: 'project-other',
    });
    expect(await rereadAuthoritativeProjectManifestSnapshot(input)).toBeNull();
  });

  it('refuses an unusable revision instead of adopting the snapshot', async () => {
    for (const revision of [-1, 1.5, Number.NaN]) {
      const { input, manifestReads } = rereadInput({ revisions: [revision] });
      expect(
        await rereadAuthoritativeProjectManifestSnapshot(input),
      ).toBeNull();
      // 版本号不可用时连清单都不该读：宁可报"未解决"，也不能拿着坏 revision 落状态。
      expect(manifestReads()).toBe(0);
    }
  });

  it('describes every recovery stage so the notice never renders blank', () => {
    const stages: ProjectManifestMergeRecoveryStage[] = [
      'recovering',
      'recovered',
      'unresolved',
    ];
    const texts = new Map<string, string>();
    for (const decision of ['revision-conflict', 'stale-revision'] as const) {
      for (const stage of stages) {
        const text = describeProjectManifestMergeRejection(decision, stage);
        expect(text.length).toBeGreaterThan(0);
        texts.set(`${decision}:${stage}`, text);
      }
    }

    // 三种阶段必须是三句不同的话，否则用户从提示上分不出"正在重读/已对齐/要重开项目"。
    expect(
      new Set(stages.map((stage) => texts.get(`revision-conflict:${stage}`)))
        .size,
    ).toBe(3);
    expect(
      new Set(stages.map((stage) => texts.get(`stale-revision:${stage}`))).size,
    ).toBe(3);
    // 两种拒收成因不同，文案必须能区分。
    expect(texts.get('revision-conflict:recovering')).not.toBe(
      texts.get('stale-revision:recovering'),
    );
    expect(texts.get('revision-conflict:recovered')).toContain(
      '已按磁盘清单重新对齐',
    );
    expect(texts.get('stale-revision:unresolved')).toContain('重新打开项目');
  });
});