package duckduckgo

import (
	"context"
	"fmt"
	"log/slog"
	"time"

	"gitea.stevedudenhoeffer.com/steve/go-extractor"
	"gitea.stevedudenhoeffer.com/steve/go-extractor/sites/internal/parse"
)

// WeatherData holds structured weather information extracted from DuckDuckGo.
type WeatherData struct {
	Location    string
	CurrentTemp float64
	Condition   string
	HighTemp    float64
	LowTemp     float64
	Humidity    string
	Wind        string
	Forecast    []DayForecast
}

// DayForecast holds a single day's forecast.
type DayForecast struct {
	Day      string
	HighTemp float64
	LowTemp  float64
	Condition string
}

// GetWeather extracts weather data from DuckDuckGo's weather widget.
func (c Config) GetWeather(ctx context.Context, b extractor.Browser, city string) (*WeatherData, error) {
	c = c.validate()

	u := c.ToSearchURL("weather " + city)

	slog.Info("fetching weather", "url", u, "city", city)
	doc, err := b.Open(ctx, u.String(), extractor.OpenPageOptions{})
	if err != nil {
		return nil, fmt.Errorf("failed to open weather page: %w", err)
	}
	defer extractor.DeferClose(doc)

	timeout := 10 * time.Second
	if err := doc.WaitForNetworkIdle(&timeout); err != nil {
		slog.Warn("WaitForNetworkIdle failed", "err", err)
	}

	return extractWeather(doc)
}

// GetWeather is a convenience function using DefaultConfig.
func GetWeather(ctx context.Context, b extractor.Browser, city string) (*WeatherData, error) {
	return DefaultConfig.GetWeather(ctx, b, city)
}

func extractWeather(doc extractor.Node) (*WeatherData, error) {
	var data WeatherData

	// Location
	locs := doc.Select("div.module--weather span.module__title__link")
	if len(locs) > 0 {
		data.Location, _ = locs[0].Text()
	}

	// Current temperature
	temps := doc.Select("div.module--weather .module__current-temp")
	if len(temps) > 0 {
		txt, _ := temps[0].Text()
		data.CurrentTemp = parse.NumericOnly(txt)
	}

	// Condition
	conds := doc.Select("div.module--weather .module__weather-summary")
	if len(conds) > 0 {
		data.Condition, _ = conds[0].Text()
	}

	// High/low
	highs := doc.Select("div.module--weather .module__high-temp")
	if len(highs) > 0 {
		txt, _ := highs[0].Text()
		data.HighTemp = parse.NumericOnly(txt)
	}

	lows := doc.Select("div.module--weather .module__low-temp")
	if len(lows) > 0 {
		txt, _ := lows[0].Text()
		data.LowTemp = parse.NumericOnly(txt)
	}

	// Humidity
	humids := doc.Select("div.module--weather .module__humidity")
	if len(humids) > 0 {
		data.Humidity, _ = humids[0].Text()
	}

	// Wind
	winds := doc.Select("div.module--weather .module__wind")
	if len(winds) > 0 {
		data.Wind, _ = winds[0].Text()
	}

	// Daily forecast
	_ = doc.ForEach("div.module--weather .module__forecast-day", func(n extractor.Node) error {
		var day DayForecast

		days := n.Select(".forecast-day__name")
		if len(days) > 0 {
			day.Day, _ = days[0].Text()
		}

		dayHighs := n.Select(".forecast-day__high")
		if len(dayHighs) > 0 {
			txt, _ := dayHighs[0].Text()
			day.HighTemp = parse.NumericOnly(txt)
		}

		dayLows := n.Select(".forecast-day__low")
		if len(dayLows) > 0 {
			txt, _ := dayLows[0].Text()
			day.LowTemp = parse.NumericOnly(txt)
		}

		dayConds := n.Select(".forecast-day__condition")
		if len(dayConds) > 0 {
			day.Condition, _ = dayConds[0].Text()
		}

		data.Forecast = append(data.Forecast, day)
		return nil
	})

	return &data, nil
}