/**
 * Git 四工具真实夹具套件（v0.7.0 覆盖补齐）
 * 临时仓库内走真实 git —— porcelain 解析、diff 截断、log NULL 字段、commit 白名单路径。
 */
import { describe, it, expect, beforeAll, afterAll } from 'vitest';
import { mkdtempSync, rmSync, writeFileSync } from 'fs';
import { tmpdir } from 'os';
import { join } from 'path';
import { execFileSync } from 'child_process';

import { GitStatusTool, GitDiffTool, GitLogTool, GitCommitTool } from '../git';
import type { ToolExecutionContext } from '../../../types/metona-tool';

let ws: string;
const ctxOf = (): ToolExecutionContext => ({ sessionId: 't', workspacePath: ws, iteration: 1, requestId: 'r' });
const runGitSilent = (...a: string[]): void => {
  execFileSync('git', ['-C', ws, ...a], { stdio: ['ignore', 'ignore', 'pipe'] });
};

beforeAll(() => {
  ws = mkdtempSync(join(tmpdir(), 'metona-git-'));
  runGitSilent('init', '-q');
  runGitSilent('config', 'user.email', 'test@metona.local');
  runGitSilent('config', 'user.name', 'Metona Test');
  writeFileSync(join(ws, 'base.txt'), 'line1\nline2\n');
  runGitSilent('add', '.');
  runGitSilent('commit', '-q', '-m', 'chore: initial');
});

afterAll(() => rmSync(ws, { recursive: true, force: true }));

describe('git_status / git_diff / git_log / git_commit（真实仓库）', () => {
  it('干净工作树：staged/unstaged 空 + branch 名非空', async () => {
    const r = (await new GitStatusTool().execute({}, ctxOf())) as {
      branch: string; ahead: number; behind: number;
      staged: Array<unknown>; unstaged: Array<unknown>; untracked: unknown[]; clean: boolean;
    };
    // 实况契约：直接返回数据载荷（无 success 包装），clean/staged/unstaged 为状态真值
    expect(String(r.branch)).not.toBe('');
    expect(r.staged).toHaveLength(0);
    expect(r.unstaged).toHaveLength(0);
    expect(r.clean).toBe(true);
  });

  it('新文件 → untracked；git add 后 → staged[A]；HEAD 提交前 ahead=0', async () => {
    writeFileSync(join(ws, 'mod.txt'), 'new\n');
    const dirty = (await new GitStatusTool().execute({}, ctxOf())) as { untracked: Array<{ file?: string }>; staged: unknown[] };
    expect(dirty.untracked).toContain('mod.txt'); // 实况契约：untracked 为字符串数组
    expect(dirty.staged).toHaveLength(0);

    runGitSilent('add', '.');
    const stagedR = (await new GitStatusTool().execute({}, ctxOf())) as {
      staged: Array<{ status: string; file: string }>; untracked: unknown[]; ahead: number;
    };
    expect(stagedR.staged).toHaveLength(1);
    expect(stagedR.staged[0].status).toBe('A');
    expect(stagedR.ahead).toBeGreaterThanOrEqual(0);
  });

  it('git_commit 提交暂存并更新 HEAD 信息', async () => {
    const r = await new GitCommitTool().execute({ message: 'feat: mod file' }, ctxOf());
    // 契约：提交后回传 commit/branch/committed 等摘要信息（以字段存在性锁定形态）
    const keys = Object.keys(r as object);
    expect(keys.some((k) => /commit|hash/i.test(k))).toBe(true);

    // files 白名单校验：越界文件被拒（WARN-1 路径校验）
    const evil = await new GitCommitTool().execute(
      { message: 'x', files: ['../outside.txt'] },
      ctxOf(),
    );
    // 拒绝可能表现为 success:false 或 error 字段 —— 锁定"必须有失败信号"
    const failureSignal =
      (evil as { success?: boolean }).success === false || !!(evil as { error?: string }).error;
    expect(failureSignal).toBe(true);
  });

  it('git_diff 默认工作树 vs HEAD：patch 含 hunk 与 filesChanged；pathspec 只看指定文件', async () => {
    writeFileSync(join(ws, 'base2.txt'), 'orig\n');
    runGitSilent('add', '.'); runGitSilent('commit', '-q', '-m', 'chore: base2');

    writeFileSync(join(ws, 'base.txt'), 'line1\nCHANGED\n');
    const r = (await new GitDiffTool().execute({}, ctxOf())) as { diff: string; filesChanged: number; truncated?: boolean };
    expect(r.diff.includes('diff --git')).toBe(true);
    expect(r.diff).toContain('@@');
    expect(r.filesChanged).toBeGreaterThanOrEqual(1);

    const scoped = (await new GitDiffTool().execute({ pathspec: 'base2.txt' }, ctxOf())) as { diff: string };
    expect(scoped.diff).not.toContain('CHANGED');
  });

  it('git_log 默认 oneline 与 limit、commits 元数据（hash+message）', async () => {
    const logTool = new GitLogTool();
    const r = await logTool.execute({ limit: 5 }, ctxOf());
    // 实况契约：返回 { commits:[{hash,message,...}], count, branch }
    const payload = r as { commits: Array<{ hash: string; message: string }>; count?: number; branch?: string };
    expect(Array.isArray(payload.commits)).toBe(true);
    expect(payload.commits.length).toBeGreaterThanOrEqual(1);
    // 日志按时间倒序：最新为前一用例的 chore: base2；历史中含 feat: mod file
    expect(String(payload.commits[0].message)).toContain('chore: base2');
    const messages = payload.commits.map((c) => String(c.message)).join('\n');
    expect(messages).toContain('feat: mod file');
    expect(String(payload.commits[0].hash)).toMatch(/^[0-9a-f]{6,}$/);

    const limited = await logTool.execute({ limit: 1 }, ctxOf());
    expect(((limited as { commits: unknown[] }).commits).length).toBe(1);
  });

  it('git_log pathspec 只返回触及该文件的提交', async () => {
    writeFileSync(join(ws, 'solo.txt'), 'solo\n');
    runGitSilent('add', 'solo.txt');
    runGitSilent('commit', '-q', '-m', 'chore: add solo');
    const r = await new GitLogTool().execute({ pathspec: 'solo.txt' }, ctxOf());
    const msgs = (r as { commits: Array<{ message: string }> }).commits.map((c) => String(c.message));
    expect(msgs.join('\n')).toContain('solo');
  });
});