package duckduckgo

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

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

// StockData holds structured stock quote information from DuckDuckGo.
type StockData struct {
	Symbol    string
	Name      string
	Price     float64
	Change    float64
	ChangePct float64
}

// StockPeriod represents a time period for stock charts.
type StockPeriod string

const (
	Period1D  StockPeriod = "1D"
	Period5D  StockPeriod = "5D"
	Period1M  StockPeriod = "1M"
	PeriodYTD StockPeriod = "YTD"
	Period1Y  StockPeriod = "1Y"
	Period5Y  StockPeriod = "5Y"
	PeriodAll StockPeriod = "All"
)

// GetStockQuote extracts structured stock data from DuckDuckGo's stock widget.
func (c Config) GetStockQuote(ctx context.Context, b extractor.Browser, symbol string) (*StockData, error) {
	c = c.validate()

	u := c.ToSearchURL(symbol + " stock")

	slog.Info("fetching stock", "url", u, "symbol", symbol)
	doc, err := b.Open(ctx, u.String(), extractor.OpenPageOptions{})
	if err != nil {
		return nil, fmt.Errorf("failed to open stock 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 extractStock(doc)
}

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

// GetStockChart screenshots the stock chart widget for a given period.
func (c Config) GetStockChart(ctx context.Context, b extractor.Browser, symbol string, period StockPeriod) ([]byte, error) {
	c = c.validate()

	u := c.ToSearchURL(symbol + " stock")

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

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

	// Click the period selector if not 1D (default)
	if period != Period1D {
		selector := fmt.Sprintf(`div.module__content button[data-period="%s"]`, string(period))
		_ = doc.ForEach(selector, func(n extractor.Node) error {
			return n.Click()
		})

		// Wait for chart to update
		chartTimeout := 5 * time.Second
		if err := doc.WaitForNetworkIdle(&chartTimeout); err != nil {
			slog.Warn("WaitForNetworkIdle after period click failed", "err", err)
		}
	}

	// Screenshot the stock module
	modules := doc.Select("div.module__content")
	if len(modules) == 0 {
		return nil, fmt.Errorf("stock module not found")
	}

	return modules[0].Screenshot()
}

// GetStockChart is a convenience function using DefaultConfig.
func GetStockChart(ctx context.Context, b extractor.Browser, symbol string, period StockPeriod) ([]byte, error) {
	return DefaultConfig.GetStockChart(ctx, b, symbol, period)
}

func extractStock(doc extractor.Node) (*StockData, error) {
	var data StockData

	// Symbol
	syms := doc.Select("div.module--stocks .module__title__link")
	if len(syms) > 0 {
		data.Symbol, _ = syms[0].Text()
	}

	// Name
	names := doc.Select("div.module--stocks .module__subtitle")
	if len(names) > 0 {
		data.Name, _ = names[0].Text()
	}

	// Price
	prices := doc.Select("div.module--stocks .module__price")
	if len(prices) > 0 {
		txt, _ := prices[0].Text()
		data.Price = parse.NumericOnly(txt)
	}

	// Change
	changes := doc.Select("div.module--stocks .module__price-change")
	if len(changes) > 0 {
		txt, _ := changes[0].Text()
		data.Change = parse.NumericOnly(txt)
	}

	// Change percentage
	pcts := doc.Select("div.module--stocks .module__price-change-pct")
	if len(pcts) > 0 {
		txt, _ := pcts[0].Text()
		data.ChangePct = parse.NumericOnly(txt)
	}

	return &data, nil
}