{
  "properties" : { },
  "id" : "5e6f7a8490b1c2d3e4f5a678903",
  "script" : null,
  "groupId" : "f8e3d2c1b0a94e5f8a7b6c5d4e3f2a1",
  "name" : "活牛鲜肉价格趋势",
  "createTime" : 1780877200000,
  "updateTime" : null,
  "lock" : null,
  "createBy" : "admin",
  "updateBy" : "admin",
  "path" : "/price-trend",
  "method" : "GET",
  "parameters" : [ ],
  "options" : [ ],
  "requestBody" : "",
  "headers" : [ ],
  "paths" : [ ],
  "responseBody" : null,
  "description" : "活牛/鲜肉价格趋势：近8个月市场采集均价。数据源 yak_trade_market_price，活牛=LIVE_YAK，鲜肉=FRESH_MEAT，直接使用 price 字段及 unit 单位，不做重量折算。",
  "requestBodyDefinition" : null,
  "responseBodyDefinition" : null
}
================================
// 只读查询，不修改任何数据
// 数据源：yak_trade_market_price（市场采集价格，已含 price + unit）
// price_type: LIVE_YAK=活牛, FRESH_MEAT=鲜肉/牛肉

var monthBucketSql = """
SELECT
  d.month_start,
  d.offs,
  TO_CHAR(d.month_start, 'FMMM') || '月' AS label
FROM (
  SELECT
    (date_trunc('month', CURRENT_DATE) - (offs || ' months')::interval)::date AS month_start,
    offs
  FROM generate_series(7, 0, -1) AS offs
) d
ORDER BY d.offs DESC
"""

var livePriceSql = """
SELECT
  date_trunc('month', p.price_date)::date AS month_start,
  ROUND(AVG(p.price)::numeric, 2) AS live_cattle_price
FROM yak_trade_market_price p
WHERE p.price_type = 'LIVE_YAK'
  AND p.price_date >= date_trunc('month', CURRENT_DATE) - INTERVAL '7 months'
GROUP BY date_trunc('month', p.price_date)::date
"""

var beefPriceSql = """
SELECT
  date_trunc('month', p.price_date)::date AS month_start,
  ROUND(AVG(p.price)::numeric, 2) AS beef_price
FROM yak_trade_market_price p
WHERE p.price_type = 'FRESH_MEAT'
  AND p.price_date >= date_trunc('month', CURRENT_DATE) - INTERVAL '7 months'
GROUP BY date_trunc('month', p.price_date)::date
"""

var unitSql = """
SELECT
  MAX(CASE WHEN price_type = 'LIVE_YAK' THEN unit END) AS live_unit,
  MAX(CASE WHEN price_type = 'FRESH_MEAT' THEN unit END) AS beef_unit
FROM yak_trade_market_price
WHERE price_type IN ('LIVE_YAK', 'FRESH_MEAT')
"""

var buckets = db.select(monthBucketSql)
var liveRows = db.select(livePriceSql)
var beefRows = db.select(beefPriceSql)
var unitRows = db.select(unitSql)

var liveMap = {}
var beefMap = {}

for (row in liveRows) {
  liveMap[row.monthStart] = row.liveCattlePrice
}

for (row in beefRows) {
  beefMap[row.monthStart] = row.beefPrice
}

var liveUnit = '元/公斤'
var beefUnit = '元/公斤'
if (unitRows && unitRows.length > 0) {
  if (unitRows[0].liveUnit) {
    liveUnit = unitRows[0].liveUnit
  }
  if (unitRows[0].beefUnit) {
    beefUnit = unitRows[0].beefUnit
  }
}

var labels = []
var liveCattlePrice = []
var beefPrice = []

for (bucket in buckets) {
  var monthKey = bucket.monthStart
  labels.push(bucket.label)
  liveCattlePrice.push(liveMap[monthKey] != null ? liveMap[monthKey] : null)
  beefPrice.push(beefMap[monthKey] != null ? beefMap[monthKey] : null)
}

return {
  labels: labels,
  liveCattlePrice: liveCattlePrice,
  beefPrice: beefPrice,
  unit: liveUnit,
  liveUnit: liveUnit,
  beefUnit: beefUnit
}