#!/usr/bin/env node

const fs = require("fs");
const path = require("path");
const { execSync } = require("child_process");

const OPENCODE_DIR = path.join(process.env.HOME || "/root", ".config", "opencode");

function getPackageDir() {
  try {
    return path.resolve(__dirname, "..");
  } catch {
    return null;
  }
}

function isGlobalInstall() {
  if (process.env.npm_config_global === "true") return true;
  if (process.env.npm_config_global === "1") return true;
  return false;
}

function copyFile(src, dest, force) {
  if (!fs.existsSync(src)) return { copied: 0, skipped: 0 };

  const dir = path.dirname(dest);
  fs.mkdirSync(dir, { recursive: true });

  if (fs.existsSync(dest) && !force) {
    try {
      const srcContent = fs.readFileSync(src, "utf8");
      const destContent = fs.readFileSync(dest, "utf8");
      if (srcContent === destContent) return { copied: 0, skipped: 1 };
    } catch {}
    return { copied: 0, skipped: 1 };
  }

  fs.copyFileSync(src, dest);
  return { copied: 1, skipped: 0 };
}

function install() {
  const pkgDir = getPackageDir();
  if (!pkgDir) {
    console.log("CI postinstall: Could not determine package directory. Skipping.");
    return;
  }

  const opencodeDir = path.join(pkgDir, "opencode");
  if (!fs.existsSync(opencodeDir)) {
    console.log("CI postinstall: opencode/ directory not found. Skipping.");
    return;
  }

  if (!isGlobalInstall()) {
    console.log("CI postinstall: Not a global install. Skipping opencode integration.");
    console.log("  Run `npx ci-install` or `./scripts/install.sh` to install manually.");
    return;
  }

  let copied = 0;
  let skipped = 0;

  function copyGlob(srcDir, destDir, pattern) {
    if (!fs.existsSync(srcDir)) return;
    const entries = fs.readdirSync(srcDir).filter((f) => {
      if (pattern instanceof RegExp) return pattern.test(f);
      return f.startsWith(pattern);
    });
    for (const entry of entries) {
      const result = copyFile(path.join(srcDir, entry), path.join(destDir, entry), false);
      copied += result.copied;
      skipped += result.skipped;
    }
  }

  fs.mkdirSync(path.join(OPENCODE_DIR, "agents"), { recursive: true });
  fs.mkdirSync(path.join(OPENCODE_DIR, "command"), { recursive: true });
  fs.mkdirSync(path.join(OPENCODE_DIR, "ci", "contexts"), { recursive: true });
  fs.mkdirSync(path.join(OPENCODE_DIR, "ci", "references"), { recursive: true });
  fs.mkdirSync(path.join(OPENCODE_DIR, "ci", "workflows"), { recursive: true });

  copyGlob(path.join(opencodeDir, "agents"), path.join(OPENCODE_DIR, "agents"), /^ci-/);
  copyGlob(path.join(opencodeDir, "command"), path.join(OPENCODE_DIR, "command"), /^ci-/);
  copyGlob(path.join(opencodeDir, "ci", "contexts"), path.join(OPENCODE_DIR, "ci", "contexts"), /\.md$/);
  copyGlob(path.join(opencodeDir, "ci", "references"), path.join(OPENCODE_DIR, "ci", "references"), /\.md$/);
  copyGlob(path.join(opencodeDir, "ci", "workflows"), path.join(OPENCODE_DIR, "ci", "workflows"), /\.md$/);

  const versionFile = path.join(opencodeDir, "ci", "VERSION");
  if (fs.existsSync(versionFile)) {
    const result = copyFile(versionFile, path.join(OPENCODE_DIR, "ci", "VERSION"), false);
    copied += result.copied;
    skipped += result.skipped;
  }

  const ciJsonPath = path.join(opencodeDir, "opencode.json");
  const targetJsonPath = path.join(OPENCODE_DIR, "opencode.json");

  if (fs.existsSync(ciJsonPath)) {
    if (!fs.existsSync(targetJsonPath)) {
      fs.copyFileSync(ciJsonPath, targetJsonPath);
    } else {
      try {
        const existing = JSON.parse(fs.readFileSync(targetJsonPath, "utf8"));
        const ciJson = JSON.parse(fs.readFileSync(ciJsonPath, "utf8"));
        existing.permission = existing.permission || {};
        existing.permission.read = existing.permission.read || {};
        existing.permission.external_directory = existing.permission.external_directory || {};
        for (const [k, v] of Object.entries(ciJson.permission?.read || {})) {
          if (!existing.permission.read[k]) existing.permission.read[k] = v;
        }
        for (const [k, v] of Object.entries(ciJson.permission?.external_directory || {})) {
          if (!existing.permission.external_directory[k]) existing.permission.external_directory[k] = v;
        }
        fs.writeFileSync(targetJsonPath, JSON.stringify(existing, null, 2));
      } catch {}
    }
  }

  console.log(`CI postinstall: ${copied} files installed, ${skipped} skipped.`);
}

try {
  install();
} catch (err) {
  console.log("CI postinstall: Non-fatal error:", err.message);
}