import { exec, execFile } from 'node:child_process';
import { mkdtemp, rm, writeFile } from 'node:fs/promises';
import { tmpdir } from 'node:os';
import { join } from 'node:path';
import { promisify } from 'node:util';
import { createClient } from '@supabase/supabase-js';
import { commentIssueAsGitHubApp, getGitHubAppRoutingStatus, routeGitHubWebhook } from './github-app-routing.js';

const execAsync = promisify(exec);
const execFileAsync = promisify(execFile);

export type GitHubAgentAction =
  | { action: 'agent.help' }
  | { action: 'sin.github.health' }
  | { action: 'sin.github.app.routing.status' }
  | { action: 'sin.github.webhook.route'; payload?: unknown; rawBody?: string; routePath?: string; signature256?: string; eventName?: string; deliveryId?: string }
  | { action: 'sin.github.issue.comment.as_app'; repo: string; issueNumber: number; body: string; agentSlug?: string; appId?: number; installationId: number }
  | { action: 'sin.github.project.orchestrate'; prompt: string; contextDir?: string }
  | { action: 'sin.github.issue.manage'; prompt: string; issueNumber?: number }
  | { action: 'sin.github.wiki.sync'; prompt: string; contextDir?: string }
  | { action: 'sin.github.discussion.start'; prompt: string; category?: string }
  | { action: 'sin.github.gist.publish'; prompt: string; isPublic?: boolean }
  | { action: 'sin.github.security.audit'; prompt: string; contextDir?: string }
  | { action: 'sin.github.pr.review'; prNumber: number; contextDir?: string }
  | { action: 'sin.github.issue.pool.enqueue'; repoName: string; issueNumber: number; title: string; body?: string; labels?: string[]; issueUrl?: string; assignedTeam?: string; assignedAgent?: string; status?: string; state?: string; routingStrategy?: string; fanoutPlan?: unknown[] }
  | { action: 'sin.github.ledger.log'; agentName: string; activityTitle: string; details: string };

export async function executeGitHubAgentAction(action: GitHubAgentAction): Promise<unknown> {
  switch (action.action) {
    case 'agent.help':
      return {
        ok: true,
        agent: 'sin-github-issues',
        mandate: 'CEO Elite GitHub Operations. Orchestrates Projects, Issues, Wikis, Discussions, Gists, Security, PR Reviews, and public Showcase Ledgers.',
        actions: [
          'sin.github.health',
          'sin.github.app.routing.status',
          'sin.github.webhook.route',
          'sin.github.issue.comment.as_app',
          'sin.github.project.orchestrate',
          'sin.github.issue.manage',
          'sin.github.wiki.sync',
          'sin.github.discussion.start',
          'sin.github.gist.publish',
          'sin.github.security.audit',
          'sin.github.pr.review',
          'sin.github.issue.pool.enqueue',
          'sin.github.ledger.log'
        ],
      };

    case 'sin.github.health':
      return {
        ok: true,
        agent: 'sin-github-issues',
        primaryModel: 'openai/gpt-5.4',
        fallbackModel: 'opencode/minimax-m2.5-free',
        team: 'Team - Coding',
        status: 'Elite 2026 GitHub Operations Architect Online',
        capabilities: ['projects', 'wikis', 'discussions', 'gists', 'security', 'prs', 'issues', 'ledger', 'github-app-routing'],
        githubAppRouting: await getGitHubAppRoutingStatus(),
      };

    case 'sin.github.app.routing.status':
      return await getGitHubAppRoutingStatus();

    case 'sin.github.webhook.route':
      return await routeGitHubWebhook(action);

    case 'sin.github.issue.comment.as_app':
      return await commentIssueAsGitHubApp(action);

    case 'sin.github.project.orchestrate':
      return await executeOpenCode(
        `Use the GitHub CLI ('gh project create/link/item-add') to orchestrate the following project board requirements: ${action.prompt}. Ensure the board is linked to the repository and items are properly assigned.`,
        action.contextDir
      );

    case 'sin.github.issue.manage':
      return await executeOpenCode(
        `Manage GitHub issues based on: ${action.prompt}. ${action.issueNumber ? `Target issue: #${action.issueNumber}` : 'Create a new Epic/Task.'} Ensure proper labeling, assignment, and milestone linking.`
      );

    case 'sin.github.wiki.sync':
      return await executeOpenCode(
        `Synchronize the repository's Wiki with the following documentation update: ${action.prompt}. Generate standard Markdown and push it to the wiki repository (.wiki.git).`,
        action.contextDir
      );

    case 'sin.github.discussion.start':
      return await executeOpenCode(
        `Start or manage a GitHub Discussion to keep issues clean. Requirements: ${action.prompt}. Category: ${action.category || 'General'}.`
      );

    case 'sin.github.gist.publish':
      return await executeOpenCode(
        `Create a GitHub Gist (public: ${action.isPublic ?? false}) for the following payload (long log, snippet, or config): ${action.prompt}. Return the Gist URL for embedding in an issue or PR.`
      );

    case 'sin.github.security.audit':
      return await executeOpenCode(
        `Audit the repository for security vulnerabilities (Dependabot/CodeQL). Generate or update '.github/dependabot.yml' and review any active alerts based on: ${action.prompt}.`,
        action.contextDir
      );

    case 'sin.github.pr.review':
      return await executeOpenCode(
        `Perform a rigorous Code Review on Pull Request #${action.prNumber}. Check for 2026 architectural compliance, security vulnerabilities, performance regressions, and test coverage. If it passes 100%, approve it ('gh pr review --approve') and merge it ('gh pr merge --auto').`,
        action.contextDir
      );

    case 'sin.github.issue.pool.enqueue':
      return await enqueueIssuePoolItem(action);

    case 'sin.github.ledger.log':
      return await publishLedgerLog(action.agentName, action.activityTitle, action.details);
  }
}

async function executeOpenCode(prompt: string, dir?: string) {
  await execAsync('python3 scripts/hf_pull_script.py').catch(() => console.warn('Warning: hf_pull_script failed. Proceeding with cached credentials.'));
  const options = dir ? { cwd: dir } : {};

  try {
    const { stdout, stderr } = await execFileAsync('opencode', ['run', prompt, '--model', 'openai/gpt-5.4'], options);
    return {
      ok: true,
      expertAnalysis: stdout,
      warnings: stderr || undefined,
    };
  } catch (error: any) {
    throw new Error(`GitHub Operations Execution Failed: ${error.message}`);
  }
}

async function publishLedgerLog(agentName: string, activityTitle: string, details: string) {
  const title = `[${agentName}] ${activityTitle}`;
  const body = [
    `# ${activityTitle}`,
    '',
    `- Agent: ${agentName}`,
    `- Published: ${new Date().toISOString()}`,
    '',
    '## Details',
    details,
  ].join('\n');
  const tempDir = await mkdtemp(join(tmpdir(), 'sin-github-ledger-'));
  const bodyPath = join(tempDir, 'ledger-body.md');

  try {
    await writeFile(bodyPath, body, 'utf8');
    const { stdout, stderr } = await execFileAsync('gh', [
      'issue',
      'create',
      '-R',
      'Delqhi/OpenSIN-Ledger',
      '--title',
      title,
      '--body-file',
      bodyPath,
    ]);
    return {
      ok: true,
      repo: 'Delqhi/OpenSIN-Ledger',
      title,
      url: stdout.trim(),
      warnings: stderr || undefined,
    };
  } catch (error: any) {
    throw new Error(`GitHub Ledger Publish Failed: ${error.message}`);
  } finally {
    await rm(tempDir, { recursive: true, force: true }).catch(() => undefined);
  }
}

async function enqueueIssuePoolItem(action: Extract<GitHubAgentAction, { action: 'sin.github.issue.pool.enqueue' }>) {
  const supabaseUrl = (process.env.SUPABASE_URL || process.env.SIN_SUPABASE_URL || '').trim();
  const serviceRoleKey = (process.env.SUPABASE_SERVICE_ROLE_KEY || process.env.SIN_SUPABASE_SERVICE_ROLE_KEY || '').trim();

  if (!supabaseUrl || !serviceRoleKey) {
    throw new Error('sin_supabase_config_missing: set SUPABASE_URL/SUPABASE_SERVICE_ROLE_KEY or SIN_SUPABASE_URL/SIN_SUPABASE_SERVICE_ROLE_KEY before enqueueing issue-pool items');
  }

  const supabase = createClient(supabaseUrl, serviceRoleKey, {
    auth: { persistSession: false, autoRefreshToken: false },
  });

  const payload = {
    issue_number: action.issueNumber,
    repo_name: action.repoName,
    title: action.title,
    body: action.body || null,
    labels: action.labels || [],
    issue_url: action.issueUrl || null,
    state: action.state || 'open',
    assigned_team: action.assignedTeam || 'team-coding',
    assigned_agent: action.assignedAgent || null,
    status: action.status || 'open',
    routing_strategy: action.routingStrategy || 'single-dispatch',
    fanout_plan: action.fanoutPlan || [],
    updated_at: new Date().toISOString(),
  };

  let { data, error } = await supabase.from('sin_issues_pool').insert(payload).select('*').single();
  if (error && /column/i.test(error.message)) {
    const fallbackPayload = {
      issue_number: action.issueNumber,
      repo_name: action.repoName,
      title: action.title,
      body: action.body || null,
      state: action.state || 'open',
      assigned_team: action.assignedTeam || 'team-coding',
      assigned_agent: action.assignedAgent || null,
      status: action.status || 'pending',
      updated_at: new Date().toISOString(),
    };
    ({ data, error } = await supabase.from('sin_issues_pool').insert(fallbackPayload).select('*').single());
  }
  if (error) {
    throw new Error(`sin_issue_pool_enqueue_failed: ${error.message}`);
  }

  return {
    ok: true,
    table: 'sin_issues_pool',
    item: data,
  };
}