/**
 * Unit tests for env-command.ts
 *
 * Tests pure utility functions: detectShell, formatExportLine, transformToOpenAI
 */
import { describe, it, expect, afterEach } from 'bun:test';
import {
  detectShell,
  formatExportLine,
  transformToOpenAI,
  parseFlag,
  findProfile,
} from '../../../src/commands/env-command';

describe('env-command', () => {
  describe('detectShell', () => {
    const originalShell = process.env['SHELL'];

    afterEach(() => {
      if (originalShell !== undefined) {
        process.env['SHELL'] = originalShell;
      } else {
        delete process.env['SHELL'];
      }
    });

    it('returns explicit bash flag', () => {
      expect(detectShell('bash')).toBe('bash');
    });

    it('returns explicit fish flag', () => {
      expect(detectShell('fish')).toBe('fish');
    });

    it('returns explicit powershell flag', () => {
      expect(detectShell('powershell')).toBe('powershell');
    });

    it('auto-detects bash from SHELL=/bin/zsh', () => {
      process.env['SHELL'] = '/bin/zsh';
      expect(detectShell('auto')).toBe('bash');
    });

    it('auto-detects bash from SHELL=/bin/bash', () => {
      process.env['SHELL'] = '/bin/bash';
      expect(detectShell()).toBe('bash');
    });

    it('auto-detects fish from SHELL=/usr/bin/fish', () => {
      process.env['SHELL'] = '/usr/bin/fish';
      expect(detectShell('auto')).toBe('fish');
    });

    it('defaults to bash when SHELL is empty', () => {
      process.env['SHELL'] = '';
      expect(detectShell()).toBe('bash');
    });

    it('ignores invalid flag and auto-detects', () => {
      process.env['SHELL'] = '/bin/bash';
      expect(detectShell('invalid')).toBe('bash');
    });

    it('auto-detects powershell from SHELL containing pwsh', () => {
      process.env['SHELL'] = '/usr/local/bin/pwsh';
      expect(detectShell('auto')).toBe('powershell');
    });
  });

  describe('formatExportLine', () => {
    it('formats bash export', () => {
      expect(formatExportLine('bash', 'API_KEY', 'sk-123')).toBe("export API_KEY='sk-123'");
    });

    it('formats fish export', () => {
      expect(formatExportLine('fish', 'API_KEY', 'sk-123')).toBe("set -gx API_KEY 'sk-123'");
    });

    it('formats powershell export', () => {
      expect(formatExportLine('powershell', 'API_KEY', 'sk-123')).toBe("$env:API_KEY = 'sk-123'");
    });

    it('escapes single quotes in values', () => {
      expect(formatExportLine('bash', 'VAL', "it's here")).toBe("export VAL='it'\\''s here'");
    });

    it('handles empty values', () => {
      expect(formatExportLine('bash', 'EMPTY', '')).toBe("export EMPTY=''");
    });

    it('handles URLs with special characters', () => {
      const url = 'http://127.0.0.1:8317/api/provider/gemini';
      expect(formatExportLine('bash', 'BASE_URL', url)).toBe(`export BASE_URL='${url}'`);
    });

    it('prevents shell injection with $() in values', () => {
      expect(formatExportLine('bash', 'TOKEN', 'safe$(whoami)')).toBe(
        "export TOKEN='safe$(whoami)'"
      );
    });

    it('prevents backtick injection in values', () => {
      expect(formatExportLine('bash', 'TOKEN', 'safe`whoami`')).toBe("export TOKEN='safe`whoami`'");
    });

    it('escapes single quotes in fish values', () => {
      expect(formatExportLine('fish', 'VAL', "it's here")).toBe("set -gx VAL 'it'\\''s here'");
    });

    it('escapes single quotes in powershell values', () => {
      expect(formatExportLine('powershell', 'VAL', "it's here")).toBe("$env:VAL = 'it''s here'");
    });
  });

  describe('transformToOpenAI', () => {
    it('maps Anthropic vars to OpenAI format', () => {
      const result = transformToOpenAI({
        ANTHROPIC_BASE_URL: 'http://127.0.0.1:8317/api/provider/gemini',
        ANTHROPIC_AUTH_TOKEN: 'ccs-internal-managed',
        ANTHROPIC_MODEL: 'claude-sonnet-4-5',
      });

      expect(result).toEqual({
        OPENAI_API_KEY: 'ccs-internal-managed',
        OPENAI_BASE_URL: 'http://127.0.0.1:8317/api/provider/gemini',
        LOCAL_ENDPOINT: 'http://127.0.0.1:8317/api/provider/gemini',
        OPENAI_MODEL: 'claude-sonnet-4-5',
      });
    });

    it('handles missing source vars gracefully', () => {
      const result = transformToOpenAI({});

      expect(result).toEqual({});
    });

    it('only extracts relevant vars', () => {
      const result = transformToOpenAI({
        ANTHROPIC_BASE_URL: 'http://localhost:8317',
        ANTHROPIC_AUTH_TOKEN: 'key',
        ANTHROPIC_MAX_TOKENS: '8096',
        DISABLE_TELEMETRY: '1',
      });

      // OPENAI_API_KEY + OPENAI_BASE_URL + LOCAL_ENDPOINT (no OPENAI_MODEL when ANTHROPIC_MODEL absent)
      expect(Object.keys(result)).toHaveLength(3);
      expect(result['ANTHROPIC_MAX_TOKENS']).toBeUndefined();
    });

    it('omits OPENAI_MODEL when ANTHROPIC_MODEL absent', () => {
      const result = transformToOpenAI({
        ANTHROPIC_BASE_URL: 'http://localhost:8317',
        ANTHROPIC_AUTH_TOKEN: 'key',
      });

      expect(result['OPENAI_MODEL']).toBeUndefined();
    });
  });

  describe('parseFlag', () => {
    it('parses --flag=value style', () => {
      expect(parseFlag(['--format=openai'], 'format')).toBe('openai');
    });

    it('parses --flag value style', () => {
      expect(parseFlag(['--format', 'openai'], 'format')).toBe('openai');
    });

    it('handles values containing =', () => {
      expect(parseFlag(['--format=key=val=ue'], 'format')).toBe('key=val=ue');
    });

    it('returns undefined for missing flag', () => {
      expect(parseFlag(['--shell', 'bash'], 'format')).toBeUndefined();
    });

    it('does not consume next flag as value', () => {
      expect(parseFlag(['--format', '--shell'], 'format')).toBeUndefined();
    });
  });

  describe('findProfile', () => {
    it('finds profile as first positional arg', () => {
      expect(findProfile(['gemini'], ['format', 'shell'])).toBe('gemini');
    });

    it('skips flags before profile', () => {
      expect(findProfile(['--format', 'openai', 'gemini'], ['format', 'shell'])).toBe('gemini');
    });

    it('skips --flag=value style flags', () => {
      expect(findProfile(['--format=openai', 'gemini'], ['format', 'shell'])).toBe('gemini');
    });

    it('handles profile before flags', () => {
      expect(findProfile(['gemini', '--format', 'openai'], ['format', 'shell'])).toBe('gemini');
    });

    it('returns undefined when no positional args', () => {
      expect(
        findProfile(['--format', 'openai', '--shell', 'fish'], ['format', 'shell'])
      ).toBeUndefined();
    });

    it('skips multiple flag-value pairs', () => {
      expect(
        findProfile(['--format', 'openai', '--shell', 'fish', 'codex'], ['format', 'shell'])
      ).toBe('codex');
    });
  });
});