#!/bin/bash

# === CONFIGURACIÓN ===
COIN_ID="tether"
VS_CURRENCY="eur"
OUTPUT="usdt-eur-2025.csv"

# Timestamps UNIX para 2025-01-01 → 2026-01-01
FROM_TIMESTAMP=$(date -j -f "%Y-%m-%d" "2025-01-01" +"%s")
TO_TIMESTAMP=$(date -j -f "%Y-%m-%d" "2026-01-01" +"%s")

# === Llamada API ===
URL="https://api.coingecko.com/api/v3/coins/$COIN_ID/market_chart/range?vs_currency=$VS_CURRENCY&from=$FROM_TIMESTAMP&to=$TO_TIMESTAMP"
echo "📡 Llamando a CoinGecko..."
RESPONSE=$(curl -s "$URL")

# === CSV: cabecera ===
echo "date_utc,date_gmt1,usdt_eur" > "$OUTPUT"

# === Procesar respuesta JSON ===
echo "$RESPONSE" | jq -c '.prices[]' | while read -r entry; do
  ts_ms=$(echo "$entry" | jq '.[0]')
  price=$(echo "$entry" | jq '.[1]')

  # UTC (timestamp → fecha UTC)
  date_utc=$(date -u -r "$((ts_ms/1000))" "+%Y-%m-%d %H:%M:%S")

  # GMT+1
  date_gmt1=$(TZ=Europe/Madrid date -r "$((ts_ms/1000))" "+%Y-%m-%d %H:%M:%S")

  echo "$date_utc,$date_gmt1,$price"
done | sort | uniq -f0 >> "$OUTPUT"

echo "✅ Exportado como $OUTPUT"