import { drizzle } from "drizzle-orm/postgres-js";
import postgres from "postgres";
import * as schema from "~/database/schema";
import { eq, and, asc } from "drizzle-orm";
import { getSocketIO } from "./socket";
import { executeAutoPick } from "~/models/draft-utils";

// Create a dedicated database connection for the timer
const connectionString = process.env.DATABASE_URL;
if (!connectionString) {
  throw new Error("DATABASE_URL is required for timer system");
}
const client = postgres(connectionString);
const db = drizzle(client, { schema });

let timerInterval: NodeJS.Timeout | null = null;

/**
 * Start the draft timer system
 * Runs every second to update all active draft timers
 */
export function startDraftTimerSystem(): void {
  if (timerInterval) {
    console.log("[Timer] Timer system already running");
    return;
  }

  timerInterval = setInterval(async () => {
    try {
      await updateDraftTimers();
    } catch (error) {
      console.error("[Timer] Error updating draft timers:", error);
    }
  }, 1000);

  console.log("[Timer] Draft timer system started");
}

/**
 * Stop the draft timer system
 */
export function stopDraftTimerSystem(): void {
  if (timerInterval) {
    clearInterval(timerInterval);
    timerInterval = null;
    console.log("[Timer] Draft timer system stopped");
  }
}

/**
 * Update all active draft timers
 * Called every second by the timer interval
 */
async function updateDraftTimers(): Promise<void> {
  const io = getSocketIO();

  // Get all active drafts
  const activeDrafts = await db.query.seasons.findMany({
    where: eq(schema.seasons.status, "draft"),
  });

  if (activeDrafts.length === 0) {
    return; // No active drafts
  }

  console.log(`[Timer] Updating timers for ${activeDrafts.length} active draft(s)`);

  for (const season of activeDrafts) {
    // Skip if draft is paused
    if (season.draftPaused) {
      continue;
    }

    const currentPickNumber = season.currentPickNumber || 1;

    // Get draft slots to determine whose turn it is
    const draftSlots = await db.query.draftSlots.findMany({
      where: eq(schema.draftSlots.seasonId, season.id),
      orderBy: asc(schema.draftSlots.draftOrder),
    });

    const totalTeams = draftSlots.length;
    if (totalTeams === 0) continue;

    // Calculate current round and pick
    const currentRound = Math.ceil(currentPickNumber / totalTeams);
    const isEvenRound = currentRound % 2 === 0;
    let pickInRound = ((currentPickNumber - 1) % totalTeams) + 1;

    // Snake draft: reverse order on even rounds
    if (isEvenRound) {
      pickInRound = totalTeams - pickInRound + 1;
    }

    const currentDraftSlot = draftSlots.find(
      (slot: any) => slot.draftOrder === pickInRound
    );

    if (!currentDraftSlot) {
      continue;
    }

    const currentTeamId = currentDraftSlot.teamId;

    // Get current team's timer
    const timer = await db.query.draftTimers.findFirst({
      where: and(
        eq(schema.draftTimers.seasonId, season.id),
        eq(schema.draftTimers.teamId, currentTeamId)
      ),
    });

    if (!timer) {
      console.warn(`[Timer] No timer found for team ${currentTeamId} in season ${season.id}`);
      continue;
    }

    // If timer is at 0 or below, check autodraft settings and trigger auto-pick
    if (timer.timeRemaining <= 0) {
      console.log(
        `[Timer] ⚠️  Timer at ${timer.timeRemaining} for team ${currentTeamId} in season ${season.id} (pick ${currentPickNumber})`
      );

      // Check if team has autodraft enabled
      const autodraftSettings = await db.query.autodraftSettings.findFirst({
        where: and(
          eq(schema.autodraftSettings.seasonId, season.id),
          eq(schema.autodraftSettings.teamId, currentTeamId)
        ),
      });

      const shouldAutodraft = autodraftSettings?.isEnabled ?? false;
      console.log(
        `[Timer] Team ${currentTeamId} autodraft: ${shouldAutodraft ? 'ENABLED' : 'DISABLED'}, triggering forced auto-pick`
      );

      await triggerAutoPick(season.id, currentTeamId, currentPickNumber, shouldAutodraft ? autodraftSettings : null);

      continue; // Skip to next draft after triggering pick
    }

    // Decrement timer
    const newTimeRemaining = timer.timeRemaining - 1;

    console.log(
      `[Timer] Season ${season.id}: Team ${currentTeamId} - ${newTimeRemaining}s remaining (pick ${currentPickNumber})`
    );

    // Update timer in database
    await db
      .update(schema.draftTimers)
      .set({
        timeRemaining: newTimeRemaining,
        updatedAt: new Date(),
      })
      .where(eq(schema.draftTimers.id, timer.id));

    // Emit timer update to all clients in the draft room
    io.to(`draft-${season.id}`).emit("timer-update", {
      seasonId: season.id,
      teamId: currentTeamId,
      timeRemaining: newTimeRemaining,
      currentPickNumber,
    });

    // If timer just hit 0, check autodraft settings and trigger auto-pick
    if (newTimeRemaining === 0) {
      console.log(
        `[Timer] Timer expired for team ${currentTeamId} in season ${season.id}, checking autodraft settings`
      );

      // Check if team has autodraft enabled
      const autodraftSettings = await db.query.autodraftSettings.findFirst({
        where: and(
          eq(schema.autodraftSettings.seasonId, season.id),
          eq(schema.autodraftSettings.teamId, currentTeamId)
        ),
      });

      const shouldAutodraft = autodraftSettings?.isEnabled ?? false;
      console.log(
        `[Timer] Autodraft ${shouldAutodraft ? 'enabled' : 'disabled'} for team ${currentTeamId}, triggering auto-pick`
      );

      await triggerAutoPick(season.id, currentTeamId, currentPickNumber, autodraftSettings || null);
    }
  }
}

/**
 * Trigger an automatic pick when timer expires
 * Uses the unified executeAutoPick function
 */
async function triggerAutoPick(
  seasonId: string,
  teamId: string,
  pickNumber: number,
  autodraftSettings: any | null
): Promise<void> {
  try {
    console.log(
      `[Timer] Triggering auto-pick for team ${teamId} in season ${seasonId}, pick ${pickNumber}`
    );

    // Execute the autopick using the unified function
    const result = await executeAutoPick({
      seasonId,
      teamId,
      pickNumber,
      triggeredBy: "timer",
      autodraftSettings,
      db,
    });

    if (!result.success) {
      console.error(`[Timer] Auto-pick failed: ${result.error}`);
      return;
    }

    console.log(`[Timer] Auto-pick complete and broadcasted`);
  } catch (error) {
    console.error("[Timer] Error in triggerAutoPick:", error);
  }
}