/**
 * POST /api/admin/migrate
 *
 * One-shot migration endpoint.  Requires the ADMIN_MIGRATE_SECRET env var
 * to be set and passed as x-admin-secret header (or ?secret= query param).
 *
 * Idempotent — safe to call multiple times (all statements use IF NOT EXISTS).
 *
 * curl -X POST https://vibnai.com/api/admin/migrate \
 *   -H "x-admin-secret: <ADMIN_MIGRATE_SECRET>"
 */
import { NextRequest, NextResponse } from "next/server";
import { query } from "@/lib/db-postgres";
import { readFileSync } from "fs";
import { join } from "path";

export async function POST(req: NextRequest) {
  const secret = process.env.ADMIN_MIGRATE_SECRET ?? "";
  if (!secret) {
    return NextResponse.json(
      { error: "ADMIN_MIGRATE_SECRET env var not set — migration endpoint disabled" },
      { status: 403 }
    );
  }

  const incoming =
    req.headers.get("x-admin-secret") ??
    new URL(req.url).searchParams.get("secret") ??
    "";

  if (incoming !== secret) {
    return NextResponse.json({ error: "Forbidden" }, { status: 403 });
  }

  const results: Array<{ statement: string; ok: boolean; error?: string }> = [];

  // Inline the DDL so this works even if the SQL file isn't on the runtime fs
  const statements = [
    `CREATE EXTENSION IF NOT EXISTS "uuid-ossp"`,

    `CREATE TABLE IF NOT EXISTS fs_users (
      id         TEXT PRIMARY KEY,
      user_id    TEXT,
      data       JSONB NOT NULL DEFAULT '{}',
      created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
      updated_at TIMESTAMPTZ NOT NULL DEFAULT now()
    )`,
    `CREATE INDEX IF NOT EXISTS fs_users_email_idx ON fs_users ((data->>'email'))`,
    `CREATE INDEX IF NOT EXISTS fs_users_user_id_idx ON fs_users (user_id)`,

    `CREATE TABLE IF NOT EXISTS fs_projects (
      id         TEXT PRIMARY KEY,
      user_id    TEXT NOT NULL,
      workspace  TEXT NOT NULL,
      slug       TEXT NOT NULL UNIQUE,
      data       JSONB NOT NULL DEFAULT '{}',
      created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
      updated_at TIMESTAMPTZ NOT NULL DEFAULT now()
    )`,
    `CREATE INDEX IF NOT EXISTS fs_projects_user_idx ON fs_projects (user_id)`,
    `CREATE INDEX IF NOT EXISTS fs_projects_workspace_idx ON fs_projects (workspace)`,

    `CREATE TABLE IF NOT EXISTS fs_sessions (
      id         TEXT PRIMARY KEY,
      user_id    TEXT,
      data       JSONB NOT NULL DEFAULT '{}',
      created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
      updated_at TIMESTAMPTZ NOT NULL DEFAULT now()
    )`,
    `CREATE INDEX IF NOT EXISTS fs_sessions_user_idx ON fs_sessions (user_id)`,
    `CREATE INDEX IF NOT EXISTS fs_sessions_project_idx ON fs_sessions ((data->>'projectId'))`,

    // agent_sessions uses TEXT for project_id to match fs_projects.id
    `CREATE TABLE IF NOT EXISTS agent_sessions (
      id            UUID PRIMARY KEY DEFAULT gen_random_uuid(),
      project_id    TEXT NOT NULL,
      app_name      TEXT NOT NULL,
      app_path      TEXT NOT NULL,
      task          TEXT NOT NULL,
      plan          JSONB,
      status        TEXT NOT NULL DEFAULT 'pending',
      output        JSONB NOT NULL DEFAULT '[]',
      changed_files JSONB NOT NULL DEFAULT '[]',
      error         TEXT,
      started_at    TIMESTAMPTZ,
      completed_at  TIMESTAMPTZ,
      created_at    TIMESTAMPTZ NOT NULL DEFAULT now(),
      updated_at    TIMESTAMPTZ NOT NULL DEFAULT now()
    )`,
    `CREATE INDEX IF NOT EXISTS agent_sessions_project_idx ON agent_sessions (project_id, created_at DESC)`,
    `CREATE INDEX IF NOT EXISTS agent_sessions_status_idx ON agent_sessions (status)`,

    `CREATE TABLE IF NOT EXISTS agent_session_events (
      id BIGSERIAL PRIMARY KEY,
      session_id UUID NOT NULL REFERENCES agent_sessions(id) ON DELETE CASCADE,
      project_id TEXT NOT NULL,
      seq INT NOT NULL,
      ts TIMESTAMPTZ NOT NULL,
      type TEXT NOT NULL,
      payload JSONB NOT NULL DEFAULT '{}'::jsonb,
      client_event_id UUID UNIQUE,
      created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
      UNIQUE(session_id, seq)
    )`,
    `CREATE INDEX IF NOT EXISTS agent_session_events_session_seq_idx ON agent_session_events (session_id, seq)`,

    // NextAuth / Prisma tables
    `CREATE TABLE IF NOT EXISTS users (
      id             TEXT PRIMARY KEY,
      name           TEXT,
      email          TEXT UNIQUE,
      email_verified TIMESTAMPTZ,
      image          TEXT
    )`,
    `CREATE TABLE IF NOT EXISTS accounts (
      id                  TEXT PRIMARY KEY,
      user_id             TEXT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
      type                TEXT NOT NULL,
      provider            TEXT NOT NULL,
      provider_account_id TEXT NOT NULL,
      refresh_token       TEXT,
      access_token        TEXT,
      expires_at          INTEGER,
      token_type          TEXT,
      scope               TEXT,
      id_token            TEXT,
      session_state       TEXT,
      UNIQUE (provider, provider_account_id)
    )`,
    `CREATE TABLE IF NOT EXISTS sessions (
      id            TEXT PRIMARY KEY,
      session_token TEXT UNIQUE NOT NULL,
      user_id       TEXT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
      expires       TIMESTAMPTZ NOT NULL
    )`,
    `CREATE TABLE IF NOT EXISTS verification_tokens (
      identifier TEXT NOT NULL,
      token      TEXT UNIQUE NOT NULL,
      expires    TIMESTAMPTZ NOT NULL,
      UNIQUE (identifier, token)
    )`,
  ];

  for (const stmt of statements) {
    const label = stmt.trim().split("\n")[0].trim().slice(0, 80);
    try {
      await query(stmt, []);
      results.push({ statement: label, ok: true });
    } catch (err) {
      results.push({
        statement: label,
        ok: false,
        error: err instanceof Error ? err.message : String(err),
      });
    }
  }

  const failed = results.filter(r => !r.ok);
  return NextResponse.json(
    { ok: failed.length === 0, results },
    { status: failed.length === 0 ? 200 : 207 }
  );
}