import { execFileSync } from "node:child_process";
import { mkdirSync, readFileSync, writeFileSync } from "node:fs";
import { dirname, resolve } from "node:path";
import { fileURLToPath, pathToFileURL } from "node:url";
import { format } from "prettier";

const __dirname = dirname(fileURLToPath(import.meta.url));
const repoRoot = resolve(__dirname, "../..");
const defaultsPath = resolve(repoRoot, "config/tutti.defaults.json");
const goOutputPath = resolve(
  repoRoot,
  "services/tuttid/types/defaults_generated.go"
);
const cliGoOutputPath = resolve(
  repoRoot,
  "apps/cli/internal/defaults/defaults_generated.go"
);
const tsOutputPath = resolve(
  repoRoot,
  "apps/desktop/src/main/generated/defaults.ts"
);
const prettierConfigPath = resolve(
  repoRoot,
  "packages/configs/prettier/base.mjs"
);
const checkOnly = process.argv.includes("--check");

const { default: prettierConfig } = await import(
  pathToFileURL(prettierConfigPath).href
);

if (isMainModule()) {
  const spec = JSON.parse(readFileSync(defaultsPath, "utf8"));

  writeGeneratedFile(goOutputPath, renderGoDefaults(spec));
  writeGeneratedFile(cliGoOutputPath, renderCliGoDefaults(spec));
  writeGeneratedFile(tsOutputPath, await renderTSDefaults(spec));
}

function isMainModule() {
  return Boolean(
    process.argv[1] &&
    resolve(process.argv[1]) === fileURLToPath(import.meta.url)
  );
}

function writeGeneratedFile(targetPath, content) {
  mkdirSync(dirname(targetPath), { recursive: true });

  if (checkOnly) {
    const existing = readFileSync(targetPath, "utf8");
    if (existing !== content) {
      throw new Error(`Generated defaults are out of date: ${targetPath}`);
    }
    return;
  }

  writeFileSync(targetPath, content, "utf8");
}

export function renderGoDefaults(specification) {
  return formatGo(`package types

// Code generated by tools/scripts/generate-defaults.mjs. DO NOT EDIT.

var generatedDefaults = generatedDefaultsSpec{
\tState: generatedStateDefaults{
\t\tProductionDirName:         ${goString(specification.state.productionDirName)},
\t\tDevelopmentDirName:        ${goString(specification.state.developmentDirName)},
\t\tRunDirName:                ${goString(specification.state.runDirName)},
\t\tLogsDirName:               ${goString(specification.state.logsDirName)},
\t\tDBFileName:                ${goString(specification.state.dbFileName)},
\t\tDaemonLogFileName:         ${goString(specification.state.daemonLogFileName)},
\t\tDesktopLogFileName:        ${goString(specification.state.desktopLogFileName)},
\t\tListenerInfoFileName:      ${goString(specification.state.listenerInfoFileName)},
\t\tPIDFileName:               ${goString(specification.state.pidFileName)},
\t},
\tTransport: generatedTransportDefaults{
\t\tDefaultTCPAddr: ${goString(specification.transport.defaultTCPAddr)},
\t},
\tLogging: generatedLoggingDefaults{
\t\tDefaultLevel:  ${goString(specification.logging.defaultLevel)},
\t\tDefaultOutput: ${goString(specification.logging.defaultOutput)},
\t\tMaxSizeMB:     ${specification.logging.maxSizeMB},
\t\tMaxBackups:    ${specification.logging.maxBackups},
\t\tMaxAgeDays:    ${specification.logging.maxAgeDays},
\t\tMaxTotalMB:    ${specification.logging.maxTotalMB},
\t},
\tAnalytics: generatedAnalyticsDefaults{
\t\tAppID:         ${specification.analytics.appId},
\t\tAppKey:        ${goString(specification.analytics.appKey)},
\t\tChannel:       ${goString(specification.analytics.channel)},
\t\tChannelDomain: ${goString(specification.analytics.channelDomain)},
\t\tAppVersion:    ${goString(specification.analytics.appVersion)},
\t},
\tAgentExtensions: generatedAgentExtensionDefaults{
\t\tSources: []generatedAgentExtensionSourceDefaults{
${(specification.agentExtensions?.sources ?? [])
  .map(
    (source) => `\t\t\t{
\t\t\t\tKey:                      ${goString(source.key)},
\t\t\t\tPinnedVersion:            ${goString(source.pinnedVersion)},
\t\t\t\tReleaseIndexURL:          ${goString(source.releaseIndexUrl)},
\t\t\t\tFallbackReleaseIndexURLs: ${goStringSlice(source.fallbackReleaseIndexUrls)},
\t\t\t\tSigningKeyID:             ${goString(source.signingKeyId)},
\t\t\t\tSigningPublicKey:         ${goString(source.signingPublicKey)},
\t\t\t\tEnabled:                  ${source.enabled},
\t\t\t},`
  )
  .join("\n")}
\t\t},
\t},
\tAgentRuntimeTools: generatedAgentRuntimeToolDefaults{
\t\tUV: generatedUVToolDefaults{
\t\t\tVersion: ${goString(specification.agentRuntimeTools?.uv?.version ?? "")},
\t\t\tArtifacts: []generatedUVToolArtifactDefaults{
${(specification.agentRuntimeTools?.uv?.artifacts ?? [])
  .map(
    (artifact) => `\t\t\t\t{
\t\t\t\t\tPlatform:          ${goString(artifact.platform)},
\t\t\t\t\tURL:               ${goString(artifact.url)},
\t\t\t\t\tSHA256:            ${goString(artifact.sha256)},
\t\t\t\t\tSizeBytes:         ${artifact.sizeBytes},
\t\t\t\t\tArchive:           ${goString(artifact.archive)},
\t\t\t\t\tArchiveExecutable: ${goString(artifact.archiveExecutable)},
\t\t\t\t},`
  )
  .join("\n")}
\t\t\t},
\t\t},
\t},
}
`);
}

export function renderCliGoDefaults(specification) {
  return formatGo(`package defaults

// Code generated by tools/scripts/generate-defaults.mjs. DO NOT EDIT.

var generatedDefaults = generatedDefaultsSpec{
\tState: generatedStateDefaults{
\t\tProductionDirName:    ${goString(specification.state.productionDirName)},
\t\tDevelopmentDirName:   ${goString(specification.state.developmentDirName)},
\t\tRunDirName:           ${goString(specification.state.runDirName)},
\t\tListenerInfoFileName: ${goString(specification.state.listenerInfoFileName)},
\t},
}
`);
}

export async function renderTSDefaults(specification) {
  return await format(
    `export const generatedDefaults = ${JSON.stringify(specification, null, 2)} as const;\n`,
    {
      ...prettierConfig,
      parser: "typescript"
    }
  );
}

function goString(value) {
  return JSON.stringify(value);
}

function goStringSlice(values = []) {
  return `[]string{${values.map(goString).join(", ")}}`;
}

function formatGo(content) {
  return execFileSync("gofmt", {
    input: content,
    encoding: "utf8"
  });
}