package handler

import (
	"net/http"
	"strconv"

	"silk-server-go/internal/middleware"
	"silk-server-go/internal/model"
	"silk-server-go/internal/service"

	"github.com/gin-gonic/gin"
	"gorm.io/gorm"
)

// RegisterWeatherRoutes 注册天气与天气预警路由
func RegisterWeatherRoutes(rg *gin.RouterGroup, db *gorm.DB, weather *service.WeatherService) {
	read := middleware.RequirePermission(db, "weather:read")
	rg.GET("/weather/now", read, weatherNow(weather))
	rg.GET("/weather/alerts", read, listWeatherAlerts(db))
}

// weatherNow 实时天气 + 规则评估（实时触发；stage 可选：late5 等）
func weatherNow(weather *service.WeatherService) gin.HandlerFunc {
	return func(c *gin.Context) {
		now, err := weather.FetchNow(c.Request.Context())
		if err != nil {
			c.JSON(http.StatusBadGateway, gin.H{"error": err.Error()})
			return
		}
		daily, err := weather.FetchDaily(c.Request.Context())
		if err != nil {
			c.JSON(http.StatusBadGateway, gin.H{"error": err.Error()})
			return
		}
		stage := c.Query("stage")
		alerts := service.EvaluateWeatherRules(*now, daily, stage)
		c.JSON(http.StatusOK, gin.H{"weather": now, "alerts": alerts})
	}
}

// listWeatherAlerts 最近天气预警
func listWeatherAlerts(db *gorm.DB) gin.HandlerFunc {
	return func(c *gin.Context) {
		limit := 20
		if l, err := strconv.Atoi(c.Query("limit")); err == nil && l > 0 && l <= 100 {
			limit = l
		}
		var list []model.WeatherAlert
		db.Order("created_at DESC").Limit(limit).Find(&list)
		c.JSON(http.StatusOK, list)
	}
}