import { getDb } from "../db.ts";
import { users } from "../../drizzle/schema.ts";
import { eq } from "drizzle-orm";

export interface EmailCampaign {
  id: number;
  name: string;
  subject: string;
  content: string;
  targetAudience: "all" | "new_users" | "inactive" | "vip" | "high_value";
  status: "draft" | "scheduled" | "sent" | "failed";
  sentAt?: Date;
  openRate: number;
  clickRate: number;
  conversionRate: number;
}

export interface SMSCampaign {
  id: number;
  name: string;
  message: string;
  targetAudience: "all" | "new_users" | "inactive" | "vip";
  status: "draft" | "scheduled" | "sent" | "failed";
  sentAt?: Date;
  deliveryRate: number;
  clickRate: number;
}

export interface PushNotification {
  id: number;
  title: string;
  body: string;
  targetAudience: "all" | "new_users" | "inactive" | "vip";
  icon: string;
  deepLink?: string;
  status: "draft" | "scheduled" | "sent";
  sentAt?: Date;
}

export interface CampaignMetrics {
  campaignId: number;
  campaignName: string;
  type: "email" | "sms" | "push";
  sentCount: number;
  openCount: number;
  clickCount: number;
  conversionCount: number;
  revenue: number;
}

// Email templates
const EMAIL_TEMPLATES = {
  welcome: {
    subject: "Welcome to CoinKrazy! 🎰 Get 5000 Free Coins",
    content: `
      <h1>Welcome to CoinKrazy!</h1>
      <p>You've been awarded 5,000 free coins to get started.</p>
      <p>Play 700+ games and win real prizes!</p>
      <a href="{{deepLink}}">Start Playing Now</a>
    `,
  },
  dailyBonus: {
    subject: "Your Daily Bonus is Ready! 💰",
    content: `
      <h1>Claim Your Daily Bonus</h1>
      <p>You have {{bonusAmount}} coins waiting for you today.</p>
      <p>Login now to claim your bonus before it expires!</p>
      <a href="{{deepLink}}">Claim Bonus</a>
    `,
  },
  seasonalEvent: {
    subject: "🎃 {{eventName}} - Limited Time Event!",
    content: `
      <h1>{{eventName}} is Here!</h1>
      <p>Join our {{eventName}} tournament and win up to ${{prizePool}}!</p>
      <p>Exclusive games and 3x bonus multiplier available now.</p>
      <a href="{{deepLink}}">Join Tournament</a>
    `,
  },
  winNotification: {
    subject: "Congratulations! You Won! 🎉",
    content: `
      <h1>You Won {{winAmount}} Coins!</h1>
      <p>Your recent spin on {{gameName}} was a huge success!</p>
      <p>Keep playing and win even more!</p>
      <a href="{{deepLink}}">Play Again</a>
    `,
  },
  reEngagement: {
    subject: "We Miss You! Come Back for {{bonusAmount}} Free Coins",
    content: `
      <h1>We Miss You!</h1>
      <p>It's been {{daysSinceLogin}} days since you last played.</p>
      <p>Come back and get {{bonusAmount}} free coins as a welcome back bonus!</p>
      <a href="{{deepLink}}">Welcome Back</a>
    `,
  },
};

const SMS_TEMPLATES = {
  dailyBonus: "CoinKrazy: Your {{bonusAmount}} coin daily bonus is ready! Claim now: {{shortLink}}",
  seasonalEvent: "🎃 {{eventName}} tournament is LIVE! Win up to ${{prizePool}}. Play now: {{shortLink}}",
  winNotification: "🎉 Congrats! You won {{winAmount}} coins on {{gameName}}! Play more: {{shortLink}}",
  reEngagement: "We miss you! Come back for {{bonusAmount}} free coins: {{shortLink}}",
};

export async function createEmailCampaign(
  name: string,
  subject: string,
  content: string,
  targetAudience: EmailCampaign["targetAudience"]
): Promise<EmailCampaign | null> {
  // In production, integrate with SendGrid/Mailgun
  return {
    id: Math.random(),
    name,
    subject,
    content,
    targetAudience,
    status: "draft",
    openRate: 0,
    clickRate: 0,
    conversionRate: 0,
  };
}

export async function createSMSCampaign(
  name: string,
  message: string,
  targetAudience: SMSCampaign["targetAudience"]
): Promise<SMSCampaign | null> {
  // In production, integrate with Twilio
  return {
    id: Math.random(),
    name,
    message,
    targetAudience,
    status: "draft",
    deliveryRate: 0,
    clickRate: 0,
  };
}

export async function createPushNotification(
  title: string,
  body: string,
  targetAudience: PushNotification["targetAudience"],
  icon: string,
  deepLink?: string
): Promise<PushNotification | null> {
  return {
    id: Math.random(),
    title,
    body,
    targetAudience,
    icon,
    deepLink,
    status: "draft",
  };
}

export async function sendEmailCampaign(campaignId: number): Promise<boolean> {
  // In production, integrate with SendGrid/Mailgun
  console.log(`Sending email campaign ${campaignId}`);
  return true;
}

export async function sendSMSCampaign(campaignId: number): Promise<boolean> {
  // In production, integrate with Twilio
  console.log(`Sending SMS campaign ${campaignId}`);
  return true;
}

export async function sendPushNotification(notificationId: number): Promise<boolean> {
  // In production, integrate with Firebase Cloud Messaging
  console.log(`Sending push notification ${notificationId}`);
  return true;
}

export async function getTargetAudienceSize(targetAudience: string): Promise<number> {
  const db = await getDb();
  if (!db) return 0;

  const allUsers = await db.select().from(users);

  switch (targetAudience) {
    case "all":
      return allUsers.length;
    case "new_users":
      // Users created in last 7 days
      const sevenDaysAgo = new Date(Date.now() - 7 * 24 * 60 * 60 * 1000);
      return allUsers.filter((u) => (u.createdAt || new Date()) > sevenDaysAgo).length;
    case "inactive":
      // Users who haven't logged in for 30 days
      const thirtyDaysAgo = new Date(Date.now() - 30 * 24 * 60 * 60 * 1000);
      return allUsers.filter((u) => (u.lastLoginAt || new Date()) < thirtyDaysAgo).length;
    case "vip":
      // Users with VIP tier
      return allUsers.filter((u) => u.role === "admin").length; // Placeholder
    case "high_value":
      // Users with high lifetime value
      return Math.floor(allUsers.length * 0.1); // Top 10%
    default:
      return 0;
  }
}

export function getEmailTemplate(templateName: keyof typeof EMAIL_TEMPLATES) {
  return EMAIL_TEMPLATES[templateName];
}

export function getSMSTemplate(templateName: keyof typeof SMS_TEMPLATES) {
  return SMS_TEMPLATES[templateName];
}

export async function trackCampaignMetrics(
  campaignId: number,
  campaignName: string,
  type: "email" | "sms" | "push",
  sentCount: number,
  openCount: number,
  clickCount: number,
  conversionCount: number,
  revenue: number
): Promise<CampaignMetrics> {
  return {
    campaignId,
    campaignName,
    type,
    sentCount,
    openCount,
    clickCount,
    conversionCount,
    revenue,
  };
}

export function calculateCampaignROI(revenue: number, cost: number): number {
  if (cost === 0) return 0;
  return ((revenue - cost) / cost) * 100;
}

export async function getABTestResults(
  campaignIdA: number,
  campaignIdB: number
): Promise<{
  winner: "A" | "B" | "tie";
  conversionRateA: number;
  conversionRateB: number;
  confidence: number;
}> {
  // Placeholder for A/B test analysis
  return {
    winner: "A",
    conversionRateA: 5.2,
    conversionRateB: 4.8,
    confidence: 0.85,
  };
}

export async function scheduleRecurringCampaign(
  campaignId: number,
  frequency: "daily" | "weekly" | "monthly",
  startDate: Date,
  endDate?: Date
): Promise<boolean> {
  // In production, integrate with a job scheduler like Bull or node-cron
  console.log(`Scheduling campaign ${campaignId} with frequency ${frequency}`);
  return true;
}

export async function getRecommendedCampaigns(): Promise<
  Array<{
    type: "email" | "sms" | "push";
    name: string;
    description: string;
    expectedROI: number;
  }>
> {
  return [
    {
      type: "email",
      name: "Daily Bonus Reminder",
      description: "Send email reminders about daily bonuses to inactive users",
      expectedROI: 250,
    },
    {
      type: "sms",
      name: "Tournament Alert",
      description: "Send SMS alerts about active tournaments to high-value players",
      expectedROI: 180,
    },
    {
      type: "push",
      name: "Win Celebration",
      description: "Send push notifications celebrating player wins",
      expectedROI: 320,
    },
  ];
}