package plugins

import "fmt"

func buildHookScript(agentName string, agentId string) string {
	return buildHookScriptWithOutput(agentName, agentId, "", false, false)
}

func buildHookScriptWithOutput(
	agentName, agentId, successOutput string,
	failClosed, nativePayload bool,
) string {
	return fmt.Sprintf(`#!/usr/bin/env node
'use strict';

// ---------------------------------------------------------------------------
// Self-contained Elydora audit hook for: %s
// Generated by @elydora/sdk — DO NOT EDIT
// ---------------------------------------------------------------------------

const crypto = require('node:crypto');
const fs = require('node:fs');
const path = require('node:path');
const os = require('node:os');

const AGENT_NAME = %q;
const AGENT_ID = %q;
const SUCCESS_OUTPUT = %q;
const FAIL_CLOSED = %t;
const NATIVE_PAYLOAD = %t;
const ELYDORA_DIR = path.join(os.homedir(), '.elydora');
const CONFIG_PATH = path.join(ELYDORA_DIR, AGENT_ID, 'config.json');
const KEY_PATH = path.join(ELYDORA_DIR, AGENT_ID, 'private.key');
const CHAIN_STATE_PATH = path.join(ELYDORA_DIR, AGENT_ID, 'chain-state.json');
const ERROR_LOG_PATH = path.join(ELYDORA_DIR, AGENT_ID, 'error.log');

%s

function parsePrivateKey(raw) {
  let value = raw.toString('utf-8');
  if (value.endsWith('\r\n')) {
    value = value.slice(0, -2);
  } else if (value.endsWith('\n')) {
    value = value.slice(0, -1);
  }
  if (!value || value.includes('\r') || value.includes('\n') || value.includes('\0')) {
    throw new Error('Private key file must contain exactly one line');
  }
  const seed = Buffer.from(value, 'base64url');
  if (seed.length !== 32 || seed.toString('base64url') !== value) {
    throw new Error('Private key must be a canonical 32-byte base64url value');
  }
  return value;
}

// ---------------------------------------------------------------------------
// Embedded crypto (from @elydora/sdk src/crypto.ts + src/utils.ts)
// ---------------------------------------------------------------------------

function base64urlEncode(data) {
  const buf = Buffer.isBuffer(data) ? data : Buffer.from(data);
  return buf.toString('base64url');
}

function base64urlDecode(input) {
  return Buffer.from(input, 'base64url');
}

function jcsCanonicalise(value) {
  if (value === null || value === undefined) return 'null';
  if (typeof value === 'boolean' || typeof value === 'number') return JSON.stringify(value);
  if (typeof value === 'string') return JSON.stringify(value);
  if (Array.isArray(value)) {
    return '[' + value.map(v => jcsCanonicalise(v)).join(',') + ']';
  }
  if (typeof value === 'object') {
    const keys = Object.keys(value).sort();
    const pairs = [];
    for (const key of keys) {
      if (value[key] !== undefined) {
        pairs.push(JSON.stringify(key) + ':' + jcsCanonicalise(value[key]));
      }
    }
    return '{' + pairs.join(',') + '}';
  }
  return JSON.stringify(value);
}

function sha256Base64url(data) {
  const input = typeof data === 'string' ? Buffer.from(data, 'utf-8') : data;
  return base64urlEncode(crypto.createHash('sha256').update(input).digest());
}

function computePayloadHash(payload) {
  return sha256Base64url(jcsCanonicalise(payload));
}

function computeChainHash(prevChainHash, payloadHash, operationId, issuedAt) {
  const input = prevChainHash + '|' + payloadHash + '|' + operationId + '|' + issuedAt;
  return sha256Base64url(input);
}

const PKCS8_ED25519_PREFIX = Buffer.from([
  0x30, 0x2e, 0x02, 0x01, 0x00, 0x30, 0x05,
  0x06, 0x03, 0x2b, 0x65, 0x70, 0x04, 0x22, 0x04, 0x20,
]);

function signEd25519(privateKeyBase64url, data) {
  const seed = Buffer.from(privateKeyBase64url, 'base64url');
  const pkcs8 = Buffer.concat([PKCS8_ED25519_PREFIX, seed]);
  const keyObject = crypto.createPrivateKey({ key: pkcs8, format: 'der', type: 'pkcs8' });
  const signature = crypto.sign(null, data, keyObject);
  return base64urlEncode(signature);
}

const ZERO_CHAIN_HASH = 'AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA';

function validateChainHash(value, source) {
  if (typeof value !== 'string' || !/^[A-Za-z0-9_-]{43}$/.test(value)) {
    throw new Error(source + ' contains an invalid chain hash');
  }
  return value;
}

function uuidv7() {
  const now = Date.now();
  const random = crypto.randomBytes(10);
  const bytes = Buffer.alloc(16);
  bytes[0] = (now / 2 ** 40) & 0xff;
  bytes[1] = (now / 2 ** 32) & 0xff;
  bytes[2] = (now / 2 ** 24) & 0xff;
  bytes[3] = (now / 2 ** 16) & 0xff;
  bytes[4] = (now / 2 ** 8) & 0xff;
  bytes[5] = now & 0xff;
  bytes[6] = 0x70 | (random[0] & 0x0f);
  bytes[7] = random[1];
  bytes[8] = 0x80 | (random[2] & 0x3f);
  bytes[9] = random[3];
  bytes[10] = random[4];
  bytes[11] = random[5];
  bytes[12] = random[6];
  bytes[13] = random[7];
  bytes[14] = random[8];
  bytes[15] = random[9];
  const hex = bytes.toString('hex');
  return (
    hex.slice(0, 8) + '-' +
    hex.slice(8, 12) + '-' +
    hex.slice(12, 16) + '-' +
    hex.slice(16, 20) + '-' +
    hex.slice(20, 32)
  );
}

function generateNonce() {
  return base64urlEncode(crypto.randomBytes(16));
}

// ---------------------------------------------------------------------------
// Chain state persistence (atomic writes)
// ---------------------------------------------------------------------------

function readChainState() {
  let raw;
  try {
    raw = readProtectedFile(
      CHAIN_STATE_PATH,
      'Chain state',
      MAX_PROTECTED_CONFIG_BYTES,
    ).toString('utf-8');
  } catch (error) {
    if (hasRuntimeErrorCode(error, 'ENOENT')) return ZERO_CHAIN_HASH;
    throw new Error('Failed to read chain state: ' + error.message);
  }
  let state;
  try {
    state = JSON.parse(raw);
  } catch (error) {
    throw new Error('Chain state is invalid JSON: ' + error.message);
  }
  if (!state || typeof state !== 'object' || Array.isArray(state)) {
    throw new Error('Chain state has an invalid shape');
  }
  return validateChainHash(state.prev_chain_hash, 'Chain state');
}

function writeChainState(chainHash) {
  writeProtectedJson(CHAIN_STATE_PATH, 'Chain state', { prev_chain_hash: chainHash });
}

// ---------------------------------------------------------------------------
// Error logging
// ---------------------------------------------------------------------------

function logError(err) {
  try {
    const ts = new Date().toISOString();
    const msg = ts + ' [' + AGENT_NAME + '] ' + (err.stack || err.message || String(err)) + '\n';
    appendProtectedText(ERROR_LOG_PATH, 'Elydora error log', msg);
  } catch (logFailure) {
    process.stderr.write(
      '[Elydora audit] Failed to write error log: ' + logFailure.message + '\n',
    );
  }
}

function resolveAuditBaseURL(config) {
  const value = config.base_url || 'https://api.elydora.com';
  if (typeof value !== 'string' || /[\\\u0000-\u0020]/.test(value)) {
    throw new Error('Agent config base_url must be an absolute HTTP or HTTPS URL');
  }
  let parsed;
  try {
    parsed = new URL(value);
  } catch (error) {
    throw new Error('Agent config base_url must be an absolute HTTP or HTTPS URL');
  }
  if (!['http:', 'https:'].includes(parsed.protocol) || !parsed.hostname) {
    throw new Error('Agent config base_url must be an absolute HTTP or HTTPS URL');
  }
  if (parsed.username || parsed.password || parsed.search || parsed.hash) {
    throw new Error(
      'Agent config base_url must exclude credentials, query parameters, and fragments',
    );
  }
  return value.replace(/\/+$/, '');
}

// ---------------------------------------------------------------------------
// Main hook logic
// ---------------------------------------------------------------------------

async function main() {
  try {
    // Read JSON from stdin
    const chunks = [];
    for await (const chunk of process.stdin) {
      chunks.push(chunk);
    }
    const rawInput = Buffer.concat(chunks).toString('utf-8').trim();
    if (!rawInput) {
      throw new Error('Hook input is empty');
    }

    let hookData;
    try {
      hookData = JSON.parse(rawInput);
    } catch (err) {
      throw new Error('Hook input is invalid JSON: ' + err.message);
    }
    if (!hookData || typeof hookData !== 'object' || Array.isArray(hookData)) {
      throw new Error('Hook input must contain a JSON object');
    }

    // Extract provider-native tool fields without reshaping the hook input.
    const clineToolEvent =
      hookData.tool_result && typeof hookData.tool_result === 'object'
        ? hookData.tool_result
        : hookData.tool_call && typeof hookData.tool_call === 'object'
          ? hookData.tool_call
          : {};
    const toolName =
      hookData.tool_name || hookData.toolName || hookData.name || clineToolEvent.name || 'unknown';
    const toolInput =
      hookData.tool_input || hookData.toolInput || hookData.input || hookData.parameters ||
      clineToolEvent.input || {};
    const sessionId =
      hookData.conversation_id || hookData.session_id || hookData.sessionId ||
      hookData.session || hookData.taskId || 'unknown';

    // Read agent config and private key
    let config;
    let privateKey;
    try {
      config = JSON.parse(readProtectedFile(
        CONFIG_PATH,
        'Agent config',
        MAX_PROTECTED_CONFIG_BYTES,
      ).toString('utf-8'));
      if (!config || typeof config !== 'object' || Array.isArray(config)) {
        throw new Error('Agent config must contain a JSON object');
      }
      if (config.agent_id !== AGENT_ID || config.agent_name !== AGENT_NAME) {
        throw new Error('Agent config identity does not match the generated audit hook');
      }
      privateKey = parsePrivateKey(readProtectedFile(KEY_PATH, 'Private key'));
    } catch (err) {
      const failure = new Error('Failed to read agent config/key: ' + err.message);
      if (FAIL_CLOSED) {
        throw failure;
      }
      logError(failure);
      return;
    }

    const orgId = config.org_id;
    const agentId = config.agent_id;
    const kid = config.kid;
    const baseUrl = resolveAuditBaseURL(config);
    const token = config.token || '';
    if (typeof orgId !== 'string' || !orgId || typeof agentId !== 'string' ||
        !agentId || typeof kid !== 'string' || !kid) {
      throw new Error('Agent config is missing org_id, agent_id, or kid');
    }
    if (typeof token !== 'string') throw new Error('Agent config token must be a string');

    // Read chain state
    const prevChainHash = readChainState();

    // Build EOR
    const operationId = uuidv7();
    const issuedAt = Date.now();
    const nonce = generateNonce();

    const payload = NATIVE_PAYLOAD ? hookData : {
      tool_name: toolName,
      tool_input: toolInput,
      session_id: sessionId,
    };

    const payloadHash = computePayloadHash(payload);
    const chainHash = computeChainHash(prevChainHash, payloadHash, operationId, issuedAt);

    const eorWithoutSig = {
      op_version: '1.0',
      operation_id: operationId,
      org_id: orgId,
      agent_id: agentId,
      issued_at: issuedAt,
      ttl_ms: 30000,
      nonce: nonce,
      operation_type: 'ai.tool_use',
      subject: { session_id: sessionId },
      action: { tool: toolName },
      payload: payload,
      payload_hash: payloadHash,
      prev_chain_hash: prevChainHash,
      agent_pubkey_kid: kid,
    };

    const canonical = jcsCanonicalise(eorWithoutSig);
    const signature = signEd25519(privateKey, Buffer.from(canonical, 'utf-8'));

    const eor = Object.assign({}, eorWithoutSig, { chain_hash: chainHash, signature: signature });

    // POST to /v1/operations (5s timeout)
    // Only update local chain state on success to prevent desync
    const url = baseUrl + '/v1/operations';
    const controller = new AbortController();
    const timeout = setTimeout(() => controller.abort(), 5000);

    try {
      const headers = {
        'Content-Type': 'application/json',
        'Accept': 'application/json',
      };
      if (token) {
        headers['Authorization'] = 'Bearer ' + token;
      }

      const res = await fetch(url, {
        method: 'POST',
        headers: headers,
        body: JSON.stringify(eor),
        signal: controller.signal,
      });

      if (res.ok) {
        writeChainState(chainHash);
        return;
      }
      if (res.status === 400) {
        // Possible chain hash mismatch — try to resync from server response
        try {
          const errBody = await res.json();
          if (errBody.error && errBody.error.code === 'PREV_HASH_MISMATCH') {
            // Extract the expected hash from the error message
            const match = (errBody.error.message || '').match(/Expected prev_chain_hash "([^"]+)"/);
            if (match) {
              const expectedHash = validateChainHash(match[1], 'Audit API mismatch response');
              writeChainState(expectedHash);
              logError(new Error('Chain hash resynced to server: ' + expectedHash));
            }
          }
        } catch (err) {
          logError(new Error('Failed to parse audit API error: ' + err.message));
        }
      }
      throw new Error('Audit API returned HTTP ' + res.status);
    } finally {
      clearTimeout(timeout);
    }
  } catch (err) {
    logError(err);
    if (FAIL_CLOSED) {
      throw err;
    }
  }
}

main().then(() => {
  if (SUCCESS_OUTPUT) {
    process.stdout.write(SUCCESS_OUTPUT);
  }
}).catch((err) => {
  process.stderr.write('[Elydora audit] ' + (err.stack || err.message || String(err)) + '\n');
  process.exitCode = 1;
});
`, agentName, agentName, agentId, successOutput, failClosed, nativePayload, protectedRuntimeFileReader)
}