import { serve } from "https://deno.land/std@0.190.0/http/server.ts";
import { createClient } from "https://esm.sh/@supabase/supabase-js@2";

const corsHeaders = {
  "Access-Control-Allow-Origin": "*",
  "Access-Control-Allow-Headers": "authorization, x-client-info, apikey, content-type",
};

serve(async (req: Request): Promise<Response> => {
  if (req.method === "OPTIONS") {
    return new Response(null, { headers: corsHeaders });
  }

  try {
    const authHeader = req.headers.get("Authorization");
    if (!authHeader) {
      return new Response(
        JSON.stringify({ error: "Unauthorized" }),
        { status: 401, headers: { ...corsHeaders, "Content-Type": "application/json" } },
      );
    }

    const supabase = createClient(
      Deno.env.get("SUPABASE_URL")!,
      Deno.env.get("SUPABASE_SERVICE_ROLE_KEY")!,
      {
        auth: {
          autoRefreshToken: false,
          persistSession: false,
        },
      },
    );

    const token = authHeader.replace("Bearer ", "");
    const { data: authData } = await supabase.auth.getUser(token);
    const user = authData.user;
    if (!user) {
      return new Response(
        JSON.stringify({ error: "Unauthorized" }),
        { status: 401, headers: { ...corsHeaders, "Content-Type": "application/json" } },
      );
    }

    const { amount, notes } = await req.json();
    const parsedAmount = Number(amount || 0);
    if (parsedAmount <= 0) {
      return new Response(
        JSON.stringify({ error: "Invalid withdrawal amount" }),
        { status: 400, headers: { ...corsHeaders, "Content-Type": "application/json" } },
      );
    }

    const { data: wallet } = await supabase
      .rpc("get_collaborator_wallet", { p_user_id: user.id });
    const currentBalance = Number(wallet?.[0]?.current_balance || 0);

    const { data: settings } = await supabase.rpc("get_collaboration_settings");
    const minWithdrawal = Number(settings?.[0]?.min_withdrawal_amount || 100000);
    const maxPendingWithdrawals = Number(settings?.[0]?.max_pending_withdrawals || 1);

    if (currentBalance < minWithdrawal) {
      return new Response(
        JSON.stringify({ error: `Minimum withdrawal is Rp ${minWithdrawal.toLocaleString("id-ID")}` }),
        { status: 400, headers: { ...corsHeaders, "Content-Type": "application/json" } },
      );
    }

    if (parsedAmount > currentBalance) {
      return new Response(
        JSON.stringify({ error: "Insufficient available balance", available: currentBalance }),
        { status: 400, headers: { ...corsHeaders, "Content-Type": "application/json" } },
      );
    }

    const { data: existingPending } = await supabase
      .from("withdrawals")
      .select("id")
      .eq("user_id", user.id)
      .eq("status", "pending");

    if ((existingPending?.length || 0) >= maxPendingWithdrawals) {
      return new Response(
        JSON.stringify({ error: `Maximum ${maxPendingWithdrawals} pending withdrawal(s) allowed` }),
        { status: 400, headers: { ...corsHeaders, "Content-Type": "application/json" } },
      );
    }

    const { data: profile } = await supabase
      .from("profiles")
      .select("bank_account_name, bank_account_number, bank_name")
      .eq("id", user.id)
      .maybeSingle();

    if (!profile?.bank_account_number || !profile?.bank_account_name || !profile?.bank_name) {
      return new Response(
        JSON.stringify({ error: "Please complete your bank account information in profile settings" }),
        { status: 400, headers: { ...corsHeaders, "Content-Type": "application/json" } },
      );
    }

    const { data: withdrawal, error: createError } = await supabase
      .from("withdrawals")
      .insert({
        user_id: user.id,
        amount: parsedAmount,
        status: "pending",
        payment_method: "bank_transfer",
        payment_reference: `${profile.bank_name} - ${profile.bank_account_number} (${profile.bank_account_name})`,
        notes: notes || null,
        created_by: user.id,
      })
      .select()
      .single();

    if (createError || !withdrawal) {
      throw createError || new Error("Failed to create withdrawal");
    }

    const { data: txId, error: holdError } = await supabase
      .rpc("hold_withdrawal_amount", {
        p_user_id: user.id,
        p_withdrawal_id: withdrawal.id,
        p_amount: parsedAmount,
      });

    if (holdError) {
      await supabase.from("withdrawals").delete().eq("id", withdrawal.id);
      throw holdError;
    }

    await supabase
      .from("withdrawals")
      .update({ wallet_transaction_id: txId })
      .eq("id", withdrawal.id);

    await supabase.functions.invoke("send-collaboration-notification", {
      body: {
        type: "withdrawal_requested",
        withdrawalId: withdrawal.id,
        userId: user.id,
        amount: parsedAmount,
        bankInfo: {
          bankName: profile.bank_name,
          accountNumber: profile.bank_account_number,
          accountName: profile.bank_account_name,
        },
      },
    });

    return new Response(
      JSON.stringify({
        success: true,
        withdrawal: { ...withdrawal, wallet_transaction_id: txId },
      }),
      { status: 201, headers: { ...corsHeaders, "Content-Type": "application/json" } },
    );
  } catch (error: unknown) {
    const message = error instanceof Error ? error.message : "Failed to create withdrawal";
    return new Response(
      JSON.stringify({ error: message }),
      { status: 500, headers: { ...corsHeaders, "Content-Type": "application/json" } },
    );
  }
});