import * as fs from "node:fs";
import * as path from "node:path";
import * as os from "node:os";
import { execSync } from "node:child_process";
import { IntelligenceBackend, BackendRequest, BackendResult, BackendType, emptyTokenUsage, OpenAIConfig, AnthropicConfig } from "./backends/types.js";
import { OpenAIBackend } from "./backends/openai.js";
import { AnthropicBackend } from "./backends/anthropic.js";
import { PlannerAgent } from "./agents/planner.js";
import { ResearcherAgent } from "./agents/researcher.js";
import { VerifierAgent } from "./agents/verifier.js";
import { SecurityAuditorAgent } from "./agents/security-auditor.js";
import { CodeReviewerAgent } from "./agents/code-reviewer.js";
import { AgentContext } from "./agents/base.js";

class MockBackend implements IntelligenceBackend {
  readonly name = "mock";
  readonly type: BackendType = "llm";

  async isAvailable(): Promise<boolean> {
    return true;
  }

  async execute(request: BackendRequest): Promise<BackendResult> {
    return {
      success: true,
      output: `Mock backend executed task for ${request.persona}: ${request.task.substring(0, 80)}`,
      artifacts: [],
      decisions: [],
      escalations: [],
      usage: emptyTokenUsage(),
    };
  }
}

describe("E2E v0.9 — Integration with mock backend", () => {
  let tempDir: string;
  const mockBackend = new MockBackend();

  beforeEach(() => {
    tempDir = fs.mkdtempSync(path.join(os.tmpdir(), "ciagent-e2e-v09-"));
    fs.mkdirSync(path.join(tempDir, ".ciagent"), { recursive: true });
    fs.mkdirSync(path.join(tempDir, "src"), { recursive: true });

    fs.writeFileSync(
      path.join(tempDir, ".ciagent", "config.json"),
      JSON.stringify({
        autonomy: { level: "full", escalation_hooks: [], clarify_budget: 10, decision_confidence_threshold: 0.6, max_revision_iterations: 3, max_verification_retries: 2, escalation_timeout_ms: 300000 },
        model_profile: "quality",
        parallelization: { enabled: true, max_concurrent_agents: 5, min_plans_for_parallel: 2 },
        verification: { automated_only: true, escalate_visual: true, escalate_external_integration: true, test_first: false },
        security: { auto_accept_low_severity: true, auto_mitigate_medium_severity: true, escalate_high_severity: true },
        git: { branching_strategy: "phase", auto_commit: false, auto_push: false },
        backend: { provider: "auto", agent_backends: { opencode: { enabled: false } }, llm_backends: {} },
      }, null, 2)
    );

    fs.writeFileSync(
      path.join(tempDir, ".ciagent", "PROJECT.md"),
      "# Project: E2E Test\n\n## Core Value\nTest CIAgent v0.9 integration\n\n## Requirements\n### Active\n- TEST-01: E2E pipeline completes\n\n## Key Decisions\n\n## Constraints\n- Test environment only"
    );

    fs.writeFileSync(
      path.join(tempDir, ".ciagent", "REQUIREMENTS.md"),
      "# Requirements\n\n## V1\n### Functional\n| ID | Description | Priority |\n|------|------|------|\n| REQ-01 | E2E test completes | high |\n\n## Traceability\n| Requirement | Phase | Status |\n|------|------|------|\n| REQ-01 | 1 | in_progress |"
    );

    fs.writeFileSync(
      path.join(tempDir, ".ciagent", "ROADMAP.md"),
      "# Roadmap\n\n## Phases\n\n| # | Name | Description | Requirements | Depends On | Status |\n|------|------|------|------|------|------|\n| 1 | Test Phase | E2E test phase | REQ-01 | | in_progress |"
    );

    fs.writeFileSync(
      path.join(tempDir, ".ciagent", "ARCHITECTURE.md"),
      "# Architecture\n\n## Overview\nE2E test architecture\n\n## Components\n| Name | Description | Boundaries | Depends On |\n|------|------|------|------|\n| core | Core module | src/core/ — test support | | \n\n## Build Order\n1. Build core\n\n## Data Flow\nSimple test flow"
    );

    fs.writeFileSync(
      path.join(tempDir, "package.json"),
      JSON.stringify({ name: "e2e-test", version: "0.1.0", scripts: { test: "echo 'no tests'" } })
    );

    fs.writeFileSync(path.join(tempDir, "tsconfig.json"), "{}");
    fs.writeFileSync(path.join(tempDir, "src", "app.ts"), "export function main() { return 1; }");

    execSync("git init", { cwd: tempDir, stdio: "pipe" });
    execSync("git add -A", { cwd: tempDir, stdio: "pipe" });
    execSync('git commit -m "init: E2E test project"', { cwd: tempDir, stdio: "pipe" });
  });

  afterEach(() => {
    try {
      fs.rmSync(tempDir, { recursive: true, force: true });
    } catch {}
  });

  it("runs a multi-agent pipeline with mock backend and collects artifacts", async () => {
    const context: AgentContext = {
      project_path: tempDir,
      phase: 1,
      stage: "research",
      specification: "Build an E2E test project that validates CIAgent v0.9 integration",
      config_path: path.join(tempDir, ".ciagent", "config.json"),
      backend: mockBackend as unknown as IntelligenceBackend,
    };

    const researcher = new ResearcherAgent();
    const researcherResult = await researcher.execute(context);
    expect(researcherResult).toBeDefined();
    expect(typeof researcherResult.success).toBe("boolean");
    expect(researcherResult.output.length).toBeGreaterThan(0);

    const planner = new PlannerAgent();
    const plannerResult = await planner.execute({ ...context, stage: "plan" });
    expect(plannerResult).toBeDefined();
    expect(typeof plannerResult.success).toBe("boolean");

    const auditor = new SecurityAuditorAgent();
    const auditorResult = await auditor.execute({ ...context, stage: "verify" });
    expect(auditorResult).toBeDefined();
    expect(typeof auditorResult.success).toBe("boolean");

    const reviewer = new CodeReviewerAgent();
    const reviewerResult = await reviewer.execute({ ...context, stage: "review" });
    expect(reviewerResult).toBeDefined();
    expect(typeof reviewerResult.success).toBe("boolean");

    const verifier = new VerifierAgent();
    const verifierResult = await verifier.execute({ ...context, stage: "verify" });
    expect(verifierResult).toBeDefined();
    expect(typeof verifierResult.success).toBe("boolean");
  });

  it("loads OpenAI and Anthropic config types without runtime errors", () => {
    const openaiConfig: OpenAIConfig = {
      base_url: "https://api.openai.com/v1",
      api_key_env: "OPENAI_API_KEY",
      model: "gpt-4o",
      model_profile: "quality",
      timeout_ms: 60000,
    };
    expect(openaiConfig.model).toBe("gpt-4o");
    expect(openaiConfig.api_key_env).toBe("OPENAI_API_KEY");

    const anthropicConfig: AnthropicConfig = {
      base_url: "https://api.anthropic.com",
      api_key_env: "ANTHROPIC_API_KEY",
      model: "claude-sonnet-4-20250514",
      model_profile: "quality",
      timeout_ms: 60000,
      api_version: "2023-06-01",
    };
    expect(anthropicConfig.model).toBe("claude-sonnet-4-20250514");
    expect(anthropicConfig.api_key_env).toBe("ANTHROPIC_API_KEY");

    const openaiBackend = new OpenAIBackend(openaiConfig);
    expect(openaiBackend.name).toBe("openai");
    expect(openaiBackend.type).toBe("llm");

    const anthropicBackend = new AnthropicBackend(anthropicConfig);
    expect(anthropicBackend.name).toBe("anthropic");
    expect(anthropicBackend.type).toBe("llm");
  });
});