import { z } from "zod";
import { publicProcedure, protectedProcedure, router } from "../_core/trpc.ts";
import { TRPCError } from "@trpc/server";

// Session management router
export const sessionsRouter = router({
  // Get all active sessions for current user
  getActiveSessions: protectedProcedure.query(async ({ ctx }) => {
    try {
      // In a real implementation, this would query the database
      // For now, returning mock data
      return {
        sessions: [
          {
            id: 1,
            deviceName: "Chrome on MacBook Pro",
            deviceType: "desktop",
            osName: "macOS",
            osVersion: "14.2",
            browserName: "Chrome",
            browserVersion: "123.0",
            ipAddress: "192.168.1.100",
            lastActivityAt: new Date().toISOString(),
            expiresAt: new Date(Date.now() + 30 * 24 * 60 * 60 * 1000).toISOString(),
            isActive: true,
            isCurrent: true,
          },
          {
            id: 2,
            deviceName: "Safari on iPhone",
            deviceType: "mobile",
            osName: "iOS",
            osVersion: "17.3",
            browserName: "Safari",
            browserVersion: "17.3",
            ipAddress: "203.0.113.45",
            lastActivityAt: new Date(Date.now() - 2 * 60 * 60 * 1000).toISOString(),
            expiresAt: new Date(Date.now() + 25 * 24 * 60 * 60 * 1000).toISOString(),
            isActive: true,
            isCurrent: false,
          },
        ],
        totalSessions: 2,
      };
    } catch (error) {
      throw new TRPCError({
        code: "INTERNAL_SERVER_ERROR",
        message: "Failed to fetch sessions",
      });
    }
  }),

  // Get current session details
  getCurrentSession: protectedProcedure.query(async ({ ctx }) => {
    try {
      // Extract device info from user agent
      const userAgent = ctx.req?.headers["user-agent"] || "";
      const ipAddress = ctx.req?.ip || ctx.req?.headers["x-forwarded-for"] || "unknown";

      return {
        sessionId: ctx.user.id,
        userId: ctx.user.id,
        deviceName: "Current Device",
        deviceType: "desktop",
        ipAddress: Array.isArray(ipAddress) ? ipAddress[0] : ipAddress,
        userAgent: userAgent,
        createdAt: new Date().toISOString(),
        expiresAt: new Date(Date.now() + 30 * 24 * 60 * 60 * 1000).toISOString(),
      };
    } catch (error) {
      throw new TRPCError({
        code: "INTERNAL_SERVER_ERROR",
        message: "Failed to fetch current session",
      });
    }
  }),

  // Log out a specific session
  logoutSession: protectedProcedure
    .input(z.object({ sessionId: z.number() }))
    .mutation(async ({ ctx, input }) => {
      try {
        // In a real implementation, this would:
        // 1. Verify the session belongs to the user
        // 2. Mark the session as inactive in the database
        // 3. Clear any session cookies/tokens

        return {
          success: true,
          message: `Session ${input.sessionId} has been logged out`,
        };
      } catch (error) {
        throw new TRPCError({
          code: "INTERNAL_SERVER_ERROR",
          message: "Failed to logout session",
        });
      }
    }),

  // Log out all other sessions
  logoutAllOthers: protectedProcedure.mutation(async ({ ctx }) => {
    try {
      // In a real implementation, this would:
      // 1. Query all sessions for the user except the current one
      // 2. Mark them all as inactive
      // 3. Clear their tokens

      return {
        success: true,
        message: "All other sessions have been logged out",
        currentSessionOnly: true,
      };
    } catch (error) {
      throw new TRPCError({
        code: "INTERNAL_SERVER_ERROR",
        message: "Failed to logout other sessions",
      });
    }
  }),

  // Update session activity
  updateActivity: protectedProcedure.mutation(async ({ ctx }) => {
    try {
      // In a real implementation, this would update the lastActivityAt timestamp
      return {
        success: true,
        lastActivityAt: new Date().toISOString(),
      };
    } catch (error) {
      throw new TRPCError({
        code: "INTERNAL_SERVER_ERROR",
        message: "Failed to update session activity",
      });
    }
  }),

  // Get session statistics
  getSessionStats: protectedProcedure.query(async ({ ctx }) => {
    try {
      return {
        totalActiveSessions: 2,
        totalDevices: 2,
        lastLoginAt: new Date(Date.now() - 1 * 60 * 60 * 1000).toISOString(),
        lastLoginDevice: "Chrome on MacBook Pro",
        lastLoginIp: "192.168.1.100",
        suspiciousActivityDetected: false,
      };
    } catch (error) {
      throw new TRPCError({
        code: "INTERNAL_SERVER_ERROR",
        message: "Failed to fetch session statistics",
      });
    }
  }),

  // Check for suspicious activity
  checkSuspiciousActivity: protectedProcedure.query(async ({ ctx }) => {
    try {
      // In a real implementation, this would:
      // 1. Check for unusual login patterns
      // 2. Detect logins from new locations
      // 3. Identify rapid successive logins

      return {
        hasSuspiciousActivity: false,
        alerts: [],
        recommendedActions: [],
      };
    } catch (error) {
      throw new TRPCError({
        code: "INTERNAL_SERVER_ERROR",
        message: "Failed to check suspicious activity",
      });
    }
  }),
});