{
  "properties" : { },
  "id" : "5e6f7a8490b1c2d3e4f5a678903",
  "script" : null,
  "groupId" : "f8e3d2c1b0a94e5f8a7b6c5d4e3f2a1",
  "name" : "活牛鲜肉价格趋势",
  "createTime" : 1780877200000,
  "updateTime" : 1781372000000,
  "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个月采集均价。数据源 gov_count_price，活牛=price_key hx，鲜肉=mnr/mnt/mnp 月均，直接使用 value 与 unit，不做重量折算。",
  "requestBodyDefinition" : null,
  "responseBodyDefinition" : null
}
================================
// gov_count_price 价格指标 price_key：
//   hx           活畜（活牛）
//   mnr/mnt/mnp  鲜肉（牦牛肉/腿/排）
// 按 year + month 对各区域采集价取 AVG(value)；无数据月份返回 null

var monthBucketSql = """
SELECT
  EXTRACT(YEAR FROM d.month_start)::int AS year,
  EXTRACT(MONTH FROM d.month_start)::int AS month,
  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
  year,
  month,
  ROUND(AVG(value)::numeric, 2) AS live_cattle_price
FROM gov_count_price
WHERE price_key = 'hx'
GROUP BY year, month
"""

var beefPriceSql = """
SELECT
  year,
  month,
  ROUND(AVG(value)::numeric, 2) AS beef_price
FROM gov_count_price
WHERE price_key IN ('mnr', 'mnt', 'mnp')
GROUP BY year, month
"""

var unitSql = """
SELECT
  MAX(CASE WHEN price_key = 'hx' THEN unit END) AS live_unit,
  MAX(CASE WHEN price_key IN ('mnr', 'mnt', 'mnp') THEN unit END) AS beef_unit
FROM gov_count_price
WHERE price_key IN ('hx', 'mnr', 'mnt', 'mnp')
"""

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) {
  var key = row.year + '-' + row.month
  liveMap[key] = row.liveCattlePrice
}

for (row in beefRows) {
  var key = row.year + '-' + row.month
  beefMap[key] = row.beefPrice
}

var liveUnit = '元/kg'
var beefUnit = '元/kg'
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.year + '-' + bucket.month
  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
}