import { Router } from "express";
import { db } from "../db.ts";
import { adminOnly, err, type AuthedRequest } from "../lib/auth.ts";
import { TEMPLATES, getTemplate, type TemplateDef } from "../lib/templates.ts";
import { seedBusiness, clearBusinessData } from "../scripts/seed.ts";

export const adminRouter = Router();

adminRouter.use(adminOnly);

function businessStats(businessId: number) {
  const scalar = (sql: string) => (db.prepare(sql).get(businessId) as any)?.v ?? 0;
  return {
    users: scalar(`SELECT COUNT(*) v FROM users WHERE business_id = ?`),
    employees: scalar(`SELECT COUNT(*) v FROM employees WHERE business_id = ?`),
    services: scalar(`SELECT COUNT(*) v FROM services WHERE business_id = ?`),
    clients: scalar(`SELECT COUNT(*) v FROM clients WHERE business_id = ?`),
    appointments: scalar(`SELECT COUNT(*) v FROM appointments WHERE business_id = ?`),
    appointments_upcoming: scalar(
      `SELECT COUNT(*) v FROM appointments WHERE business_id = ? AND status='scheduled' AND start_at >= datetime('now')`
    ),
    revenue_30d: scalar(
      `SELECT COALESCE(SUM(amount+tip),0) v FROM tickets WHERE business_id = ? AND created_at >= datetime('now','-30 days')`
    ),
    tickets: scalar(`SELECT COUNT(*) v FROM tickets WHERE business_id = ?`),
  };
}

function businessRow(id: number) {
  return db
    .prepare(
      `SELECT id, name, industry, currency, currency_symbol, phone, address, slug, plan, status, template, trial_ends_at, created_at
       FROM businesses WHERE id = ?`
    )
    .get(id) as any;
}

// Platform overview
adminRouter.get("/overview", (_req: AuthedRequest, res) => {
  const scalar = (sql: string) => (db.prepare(sql).get() as any)?.v ?? 0;
  res.json({
    businesses: scalar(`SELECT COUNT(*) v FROM businesses`),
    active_businesses: scalar(`SELECT COUNT(*) v FROM businesses WHERE status='active'`),
    trial_businesses: scalar(`SELECT COUNT(*) v FROM businesses WHERE plan='trial'`),
    total_users: scalar(`SELECT COUNT(*) v FROM users WHERE role IN ('owner','employee')`),
    total_appointments: scalar(`SELECT COUNT(*) v FROM appointments`),
    revenue_30d: scalar(`SELECT COALESCE(SUM(amount+tip),0) v FROM tickets WHERE created_at >= datetime('now','-30 days')`),
    upcoming_appointments: scalar(
      `SELECT COUNT(*) v FROM appointments WHERE status='scheduled' AND start_at >= datetime('now')`
    ),
    templates: TEMPLATES.length,
  });
});

// List templates
adminRouter.get("/templates", (_req: AuthedRequest, res) => {
  const out = TEMPLATES.map((t) => ({
    key: t.key,
    name: t.name,
    industry: t.industry,
    description: t.description,
    currency: t.currency,
    currency_symbol: t.currency_symbol,
    employees: t.employees.length,
    services: t.services.length,
    clients: t.clients.length,
  }));
  res.json({ templates: out });
});

// List all businesses with stats
adminRouter.get("/businesses", (_req: AuthedRequest, res) => {
  const rows = db
    .prepare(
      `SELECT id, name, industry, currency, currency_symbol, phone, address, slug, plan, status, template, trial_ends_at, created_at
       FROM businesses ORDER BY created_at DESC`
    )
    .all() as any[];
  const out = rows.map((b) => ({ business: b, stats: businessStats(b.id) }));
  res.json({ businesses: out });
});

// Business detail
adminRouter.get("/businesses/:id", (req: AuthedRequest, res) => {
  const id = Number(req.params.id);
  const b = businessRow(id);
  if (!b) return err(res, 404, "Negocio no encontrado");
  res.json({ business: b, stats: businessStats(id) });
});

// Create business + owner + template seed
adminRouter.post("/businesses", (req: AuthedRequest, res) => {
  const { name, industry, template, ownerName, ownerEmail, ownerPassword, plan, currency, currency_symbol } = req.body ?? {};
  if (!name) return err(res, 400, "El nombre del negocio es obligatorio");
  if (!ownerEmail) return err(res, 400, "El correo del dueño es obligatorio");

  const tpl: TemplateDef | undefined = template ? getTemplate(template) : getTemplate("blank");
  if (!tpl) return err(res, 400, "Plantilla no válida");

  const email = String(ownerEmail).toLowerCase().trim();
  const existing = db.prepare(`SELECT id FROM users WHERE email = ?`).get(email);
  if (existing) return err(res, 409, "Ya existe un usuario con ese correo");

  const biz = db
    .prepare(
      `INSERT INTO businesses (name, industry, currency, currency_symbol, plan, status, template)
       VALUES (?, ?, ?, ?, ?, 'active', ?) RETURNING id`
    )
    .get(
      name,
      industry || tpl.industry,
      currency || tpl.currency || "MXN",
      currency_symbol || tpl.currency_symbol || "$",
      plan || "trial",
      tpl.key
    ) as { id: number };

  const result = seedBusiness({
    businessId: biz.id,
    template: tpl,
    ownerEmail: email,
    ownerName: ownerName || "Dueño",
    ownerPassword: ownerPassword || "demo1234",
    withHistory: tpl.key !== "blank",
    withUpcoming: tpl.key !== "blank",
  });

  res.status(201).json({
    business: businessRow(biz.id),
    stats: businessStats(biz.id),
    seeded: result,
    message: `Negocio "${name}" creado con plantilla "${tpl.name}"`,
  });
});

// Update business
adminRouter.patch("/businesses/:id", (req: AuthedRequest, res) => {
  const id = Number(req.params.id);
  const existing = businessRow(id);
  if (!existing) return err(res, 404, "Negocio no encontrado");
  const { name, industry, phone, address, slug, plan, status, trial_ends_at } = req.body ?? {};
  db.prepare(
    `UPDATE businesses SET name=?, industry=?, phone=?, address=?, slug=?, plan=?, status=?, trial_ends_at=? WHERE id=?`
  ).run(
    name ?? existing.name,
    industry ?? existing.industry,
    phone ?? existing.phone,
    address ?? existing.address,
    slug ?? existing.slug,
    plan ?? existing.plan,
    status ?? existing.status,
    trial_ends_at ?? existing.trial_ends_at,
    id
  );
  res.json({ business: businessRow(id), stats: businessStats(id) });
});

// Delete business + all its data
adminRouter.delete("/businesses/:id", (req: AuthedRequest, res) => {
  const id = Number(req.params.id);
  const existing = businessRow(id);
  if (!existing) return err(res, 404, "Negocio no encontrado");
  clearBusinessData(id);
  // clearBusinessData preserves user accounts; a full delete removes them too
  db.prepare(`DELETE FROM users WHERE business_id = ?`).run(id);
  db.prepare(`DELETE FROM businesses WHERE id = ?`).run(id);
  res.json({ ok: true });
});

// Load template data into an existing business (clearFirst optional)
adminRouter.post("/businesses/:id/seed-template", (req: AuthedRequest, res) => {
  const id = Number(req.params.id);
  const b = businessRow(id);
  if (!b) return err(res, 404, "Negocio no encontrado");
  const { template, clearFirst = true, ownerEmail, ownerName, ownerPassword, withHistory = true, withUpcoming = true } = req.body ?? {};
  const tpl: TemplateDef | undefined = template ? getTemplate(template) : b.template ? getTemplate(b.template) : getTemplate("blank");
  if (!tpl) return err(res, 400, "Plantilla no válida");
  const result = seedBusiness({
    businessId: id,
    template: tpl,
    ownerEmail: ownerEmail ?? (db.prepare(`SELECT email FROM users WHERE business_id=? AND role='owner'`).get(id) as any)?.email,
    ownerName: ownerName ?? "Dueño",
    ownerPassword: ownerPassword ?? "demo1234",
    clearFirst: clearFirst !== false,
    withHistory,
    withUpcoming,
  });
  res.json({ business: businessRow(id), stats: businessStats(id), seeded: result });
});

// Reset demo data (clear + reseed with current template)
adminRouter.post("/businesses/:id/reset-demo", (req: AuthedRequest, res) => {
  const id = Number(req.params.id);
  const b = businessRow(id);
  if (!b) return err(res, 404, "Negocio no encontrado");
  const tplKey = req.body?.template || b.template || "blank";
  const tpl = getTemplate(tplKey);
  if (!tpl) return err(res, 400, "Plantilla no válida");
  const owner = db.prepare(`SELECT email, name FROM users WHERE business_id=? AND role='owner'`).get(id) as any;
  const result = seedBusiness({
    businessId: id,
    template: tpl,
    ownerEmail: owner?.email,
    ownerName: owner?.name ?? "Dueño",
    clearFirst: true,
    withHistory: tpl.key !== "blank",
    withUpcoming: tpl.key !== "blank",
  });
  res.json({ business: businessRow(id), stats: businessStats(id), seeded: result });
});