import { beforeEach, describe, expect, test } from 'bun:test';
import { useSessionWorktreeStore } from './session-worktree-store';
import { useSessionUIStore } from './session-ui-store';

/**
 * Unit tests for session worktree routing through the authoritative store.
 *
 * These tests verify that session-worktree-store is properly integrated as the
 * authoritative holder of session↔worktree attachments, and that session-ui-store
 * routes through it for switching and creation flows.
 *
 * Note: Full integration tests for setCurrentSession require runtime mocking.
 * These tests focus on the contract layer: that setAttachment/getAttachment work
 * correctly and that the contract helpers produce correct results.
 */

describe('session-worktree-store worktree routing', () => {
  beforeEach(() => {
    // Clear all attachments before each test
    const store = useSessionWorktreeStore.getState();
    const attachments = store.attachments;
    for (const sessionId of attachments.keys()) {
      store.clearAttachment(sessionId);
    }
    useSessionUIStore.setState({ currentSessionId: null, worktreeMetadata: new Map() });
  });

  test('getDirectoryForSession prefers authoritative attachment cwd over sync fallback', () => {
    useSessionWorktreeStore.getState().setAttachment('session-dir', {
      worktreeRoot: '/repo/worktrees/feat-a',
      cwd: '/repo/worktrees/feat-a/src',
      branch: 'feat-a',
      headState: 'branch',
      worktreeStatus: 'ready',
      worktreeSource: 'existing',
      legacy: false,
      degraded: false,
    });

    expect(useSessionUIStore.getState().getDirectoryForSession('session-dir')).toBe('/repo/worktrees/feat-a/src');
  });

  test('getDirectoryForSession falls back to authoritative worktreeRoot when attachment is degraded', () => {
    useSessionWorktreeStore.getState().setAttachment('session-dir', {
      worktreeRoot: '/repo/worktrees/feat-a',
      cwd: '/tmp/outside',
      branch: 'feat-a',
      headState: 'branch',
      worktreeStatus: 'invalid',
      worktreeSource: 'existing',
      legacy: false,
      degraded: true,
    });

    expect(useSessionUIStore.getState().getDirectoryForSession('session-dir')).toBe('/repo/worktrees/feat-a');
  });

  test('setCurrentSession uses canonical cwd when valid', () => {
    const store = useSessionWorktreeStore.getState();

    // Simulate: session has valid worktree metadata with cwd inside worktreeRoot
    store.setAttachment('session-1', {
      worktreeRoot: '/repo/worktrees/feat-a',
      cwd: '/repo/worktrees/feat-a/src',
      branch: 'feat-a',
      headState: 'branch',
      worktreeStatus: 'ready',
      worktreeSource: 'existing',
      legacy: false,
      degraded: false,
    });

    const attachment = store.getAttachment('session-1');
    expect(attachment).toBeDefined();
    expect(attachment.cwd).toBe('/repo/worktrees/feat-a/src');
    expect(attachment.worktreeRoot).toBe('/repo/worktrees/feat-a');
    expect(attachment.degraded).toBe(false);
    expect(attachment.worktreeStatus).toBe('ready');
  });

  test('setCurrentSession falls back to worktreeRoot when cwd is degraded', () => {
    const store = useSessionWorktreeStore.getState();

    // Simulate: cwd is outside worktreeRoot (degraded)
    store.setAttachment('session-2', {
      worktreeRoot: '/repo/worktrees/feat-a',
      cwd: '/repo/worktrees/feat-a', // same as worktreeRoot means not degraded for this case
      branch: 'feat-a',
      headState: 'branch',
      worktreeStatus: 'ready',
      worktreeSource: 'existing',
      legacy: false,
      degraded: true, // marked degraded because cwd was resolved from invalid state
    });

    const attachment = store.getAttachment('session-2');
    expect(attachment).toBeDefined();
    expect(attachment.degraded).toBe(true);
    // cwd should equal worktreeRoot when degraded (fallback)
    expect(attachment.cwd).toBe(attachment.worktreeRoot);
  });

  test('isolated session initializes created-for-session attachment', () => {
    const store = useSessionWorktreeStore.getState();

    // Simulate: isolated worktree session created for a specific branch
    store.setAttachment('session-isolated', {
      worktreeRoot: '/repo/worktrees/feature-xyz',
      cwd: '/repo/worktrees/feature-xyz',
      branch: 'feature-xyz',
      headState: 'branch',
      worktreeStatus: 'ready',
      worktreeSource: 'created-for-session',
      legacy: false,
      degraded: false,
    });

    const attachment = store.getAttachment('session-isolated');
    expect(attachment).toBeDefined();
    expect(attachment.worktreeSource).toBe('created-for-session');
    expect(attachment.worktreeStatus).toBe('ready');
    expect(attachment.legacy).toBe(false);
  });

  test('legacy session upgrades when runtime canonicalization recovers a worktree', () => {
    const store = useSessionWorktreeStore.getState();

    // Simulate: session without metadata (legacy) gets upgraded via runtime resolution
    // Initially no attachment
    let attachment = store.getAttachment('session-legacy');
    expect(attachment).toBeUndefined();

    // Runtime canonicalization resolves it to a worktree
    store.setAttachment('session-legacy', {
      worktreeRoot: '/repo/worktrees/recovered',
      cwd: '/repo/worktrees/recovered',
      branch: 'recovered',
      headState: 'branch',
      worktreeStatus: 'ready',
      worktreeSource: 'existing',
      legacy: false, // upgraded from legacy=true to false
      degraded: false,
    });

    attachment = store.getAttachment('session-legacy');
    expect(attachment).toBeDefined();
    expect(attachment.legacy).toBe(false);
    expect(attachment.worktreeRoot).toBe('/repo/worktrees/recovered');
  });

  test('missing worktree session has missing status', () => {
    const store = useSessionWorktreeStore.getState();

    // Simulate: session whose worktree was deleted
    store.setAttachment('session-missing', {
      worktreeRoot: null,
      cwd: null,
      branch: null,
      headState: 'branch',
      worktreeStatus: 'missing',
      worktreeSource: null,
      legacy: false,
      degraded: true,
    });

    const attachment = store.getAttachment('session-missing');
    expect(attachment).toBeDefined();
    expect(attachment.worktreeStatus).toBe('missing');
    expect(attachment.degraded).toBe(true);
  });

  test('not-a-repo session has correct status', () => {
    const store = useSessionWorktreeStore.getState();

    // Simulate: session opened in a directory that is not a git repo
    store.setAttachment('session-not-repo', {
      worktreeRoot: null,
      cwd: '/tmp/not-a-repo',
      branch: null,
      headState: 'detached',
      worktreeStatus: 'not-a-repo',
      worktreeSource: null,
      legacy: false,
      degraded: true,
    });

    const attachment = store.getAttachment('session-not-repo');
    expect(attachment).toBeDefined();
    expect(attachment.worktreeStatus).toBe('not-a-repo');
  });
});