/**
 * Coolify API client for Vibn project provisioning.
 *
 * Used server-side only. Credentials from env vars:
 *   COOLIFY_URL        — e.g. http://34.19.250.135:8000
 *   COOLIFY_API_TOKEN  — admin bearer token
 */

const COOLIFY_URL = process.env.COOLIFY_URL ?? 'http://34.19.250.135:8000';
const COOLIFY_API_TOKEN = process.env.COOLIFY_API_TOKEN ?? '';

export interface CoolifyProject {
  uuid: string;
  name: string;
  description?: string;
}

export interface CoolifyDatabase {
  uuid: string;
  name: string;
  type: string;
  status: string;
  internal_db_url?: string;
  external_db_url?: string;
  /** When true, Coolify publishes a host port for remote connections */
  is_public?: boolean;
  /** Host port mapped to 5432 inside the container */
  public_port?: number;
}

export interface CoolifyApplication {
  uuid: string;
  name: string;
  status: string;
  fqdn?: string;
  git_repository?: string;
  git_branch?: string;
  project_uuid?: string;
  environment_name?: string;
  /** Coolify sometimes nests these under an `environment` object */
  environment?: { project_uuid?: string; project?: { uuid?: string } };
}

export interface CoolifyEnvVar {
  uuid?: string;
  key: string;
  value: string;
  is_preview?: boolean;
  is_build_time?: boolean;
  is_literal?: boolean;
  is_multiline?: boolean;
  is_shown_once?: boolean;
}

async function coolifyFetch(path: string, options: RequestInit = {}) {
  const url = `${COOLIFY_URL}/api/v1${path}`;
  const res = await fetch(url, {
    ...options,
    headers: {
      'Content-Type': 'application/json',
      Authorization: `Bearer ${COOLIFY_API_TOKEN}`,
      ...(options.headers ?? {}),
    },
  });

  if (!res.ok) {
    const text = await res.text();
    throw new Error(`Coolify API error ${res.status} on ${path}: ${text}`);
  }

  if (res.status === 204) return null;
  return res.json();
}

// ──────────────────────────────────────────────────
// Projects
// ──────────────────────────────────────────────────

export async function listProjects(): Promise<CoolifyProject[]> {
  return coolifyFetch('/projects');
}

export async function createProject(name: string, description?: string): Promise<CoolifyProject> {
  return coolifyFetch('/projects', {
    method: 'POST',
    body: JSON.stringify({ name, description }),
  });
}

export async function getProject(uuid: string): Promise<CoolifyProject> {
  return coolifyFetch(`/projects/${uuid}`);
}

export async function deleteProject(uuid: string): Promise<void> {
  await coolifyFetch(`/projects/${uuid}`, { method: 'DELETE' });
}

// ──────────────────────────────────────────────────
// Databases
// ──────────────────────────────────────────────────

type DBType = 'postgresql' | 'mysql' | 'mariadb' | 'redis' | 'mongodb' | 'keydb';

export async function createDatabase(opts: {
  projectUuid: string;
  name: string;
  type: DBType;
  serverUuid?: string;
  environmentName?: string;
}): Promise<CoolifyDatabase> {
  const { projectUuid, name, type, serverUuid = '0', environmentName = 'production' } = opts;

  return coolifyFetch(`/databases`, {
    method: 'POST',
    body: JSON.stringify({
      project_uuid: projectUuid,
      name,
      type,
      server_uuid: serverUuid,
      environment_name: environmentName,
    }),
  });
}

export async function getDatabase(uuid: string): Promise<CoolifyDatabase> {
  return coolifyFetch(`/databases/${uuid}`);
}

export async function deleteDatabase(uuid: string): Promise<void> {
  await coolifyFetch(`/databases/${uuid}`, { method: 'DELETE' });
}

// ──────────────────────────────────────────────────
// Applications
// ──────────────────────────────────────────────────

export async function createApplication(opts: {
  projectUuid: string;
  name: string;
  gitRepo: string;       // e.g. "https://git.vibnai.com/mark/taskmaster.git"
  gitBranch?: string;
  serverUuid?: string;
  environmentName?: string;
  buildPack?: string;    // nixpacks, static, dockerfile
  ports?: string;        // e.g. "3000"
}): Promise<CoolifyApplication> {
  const {
    projectUuid, name, gitRepo,
    gitBranch = 'main',
    serverUuid = process.env.COOLIFY_SERVER_UUID ?? 'jws4g4cgssss4cw48s488woc',
    environmentName = 'production',
    buildPack = 'nixpacks',
    ports = '3000',
  } = opts;

  return coolifyFetch(`/applications`, {
    method: 'POST',
    body: JSON.stringify({
      project_uuid: projectUuid,
      name,
      git_repository: gitRepo,
      git_branch: gitBranch,
      server_uuid: serverUuid,
      environment_name: environmentName,
      build_pack: buildPack,
      ports_exposes: ports,
    }),
  });
}

/**
 * Create a Coolify service for one app inside a Turborepo monorepo.
 * Build command uses `turbo run build --filter` to target just that app.
 */
export async function createMonorepoAppService(opts: {
  projectUuid: string;
  appName: string;
  gitRepo: string;
  gitBranch?: string;
  domain: string;
  serverUuid?: string;
  environmentName?: string;
}): Promise<CoolifyApplication> {
  const {
    projectUuid, appName, gitRepo,
    gitBranch = 'main',
    domain,
    serverUuid = process.env.COOLIFY_SERVER_UUID ?? 'jws4g4cgssss4cw48s488woc',
    environmentName = 'production',
  } = opts;

  return coolifyFetch(`/applications`, {
    method: 'POST',
    body: JSON.stringify({
      project_uuid: projectUuid,
      name: appName,
      git_repository: gitRepo,
      git_branch: gitBranch,
      server_uuid: serverUuid,
      environment_name: environmentName,
      build_pack: 'nixpacks',
      build_command: `pnpm install && turbo run build --filter=${appName}`,
      start_command: `turbo run start --filter=${appName}`,
      ports_exposes: '3000',
      fqdn: `https://${domain}`,
    }),
  });
}

export async function listApplications(): Promise<CoolifyApplication[]> {
  return coolifyFetch('/applications');
}

export async function deployApplication(uuid: string): Promise<{ deployment_uuid: string }> {
  return coolifyFetch(`/applications/${uuid}/deploy`, { method: 'POST' });
}

export async function getApplication(uuid: string): Promise<CoolifyApplication> {
  return coolifyFetch(`/applications/${uuid}`);
}

export async function getDeploymentLogs(deploymentUuid: string): Promise<{ logs: string }> {
  return coolifyFetch(`/deployments/${deploymentUuid}/logs`);
}

export async function listApplicationDeployments(uuid: string): Promise<Array<{
  uuid: string;
  status: string;
  created_at?: string;
  finished_at?: string;
  commit?: string;
}>> {
  return coolifyFetch(`/applications/${uuid}/deployments`);
}

// ──────────────────────────────────────────────────
// Environment variables
// ──────────────────────────────────────────────────

export async function listApplicationEnvs(uuid: string): Promise<CoolifyEnvVar[]> {
  return coolifyFetch(`/applications/${uuid}/envs`);
}

export async function upsertApplicationEnv(
  uuid: string,
  env: CoolifyEnvVar & { is_preview?: boolean }
): Promise<CoolifyEnvVar> {
  // Coolify accepts PATCH for updates and POST for creates. We try
  // PATCH first (idempotent upsert on key), fall back to POST.
  try {
    return await coolifyFetch(`/applications/${uuid}/envs`, {
      method: 'PATCH',
      body: JSON.stringify(env),
    });
  } catch (err) {
    const msg = err instanceof Error ? err.message : String(err);
    if (msg.includes('404') || msg.includes('405')) {
      return coolifyFetch(`/applications/${uuid}/envs`, {
        method: 'POST',
        body: JSON.stringify(env),
      });
    }
    throw err;
  }
}

export async function deleteApplicationEnv(uuid: string, key: string): Promise<void> {
  await coolifyFetch(`/applications/${uuid}/envs/${encodeURIComponent(key)}`, {
    method: 'DELETE',
  });
}

// ──────────────────────────────────────────────────
// Tenant helpers
// ──────────────────────────────────────────────────

/**
 * Return the Coolify project UUID an application belongs to, working
 * around Coolify v4 sometimes nesting it under `environment`.
 */
export function projectUuidOf(app: CoolifyApplication): string | null {
  return (
    app.project_uuid ??
    app.environment?.project_uuid ??
    app.environment?.project?.uuid ??
    null
  );
}

/**
 * Fetch an application AND verify it lives in the expected Coolify
 * project. Throws a `TenantError` when the app is cross-tenant so
 * callers can translate to HTTP 403.
 */
export class TenantError extends Error {
  status = 403 as const;
}

export async function getApplicationInProject(
  appUuid: string,
  expectedProjectUuid: string
): Promise<CoolifyApplication> {
  const app = await getApplication(appUuid);
  const actualProject = projectUuidOf(app);
  if (!actualProject || actualProject !== expectedProjectUuid) {
    throw new TenantError(
      `Application ${appUuid} does not belong to project ${expectedProjectUuid}`
    );
  }
  return app;
}

/** List applications that belong to the given Coolify project. */
export async function listApplicationsInProject(
  projectUuid: string
): Promise<CoolifyApplication[]> {
  const all = await listApplications();
  return all.filter(a => projectUuidOf(a) === projectUuid);
}