add correct backfile

Signed-off-by: GnomeZworc <nicolas.boufidjeline@g3e.fr>

internal/pipeline/yahoo.go

@@ -5,6 +5,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"net/http"
+	"time"
 )
 
 type yahooChart struct {
@@ -14,6 +15,12 @@ type yahooChart struct {
 				RegularMarketPrice float64 `json:"regularMarketPrice"`
 				Currency           string  `json:"currency"`
 			} `json:"meta"`
+			Timestamps []int64 `json:"timestamp"`
+			Indicators struct {
+				Quote []struct {
+					Close []*float64 `json:"close"`
+				} `json:"quote"`
+			} `json:"indicators"`
 		} `json:"result"`
 		Error *struct{ Description string } `json:"error"`
 	} `json:"chart"`
@@ -23,33 +30,79 @@ type yahooChart struct {
 func FetchYahooPrice(ctx context.Context, ticker string) (float64, error) {
 	url := fmt.Sprintf(
 		"https://query1.finance.yahoo.com/v8/finance/chart/%s?interval=1d&range=1d", ticker)
+	return fetchYahoo(ctx, url, ticker)
+}
 
-	req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
+// FetchYahooHistory récupère les prix de clôture journaliers entre from et to.
+// Retourne une slice de (time, price) pour chaque jour ayant une clôture non nulle.
+func FetchYahooHistory(ctx context.Context, ticker string, from, to time.Time) ([]PricePoint, error) {
+	url := fmt.Sprintf(
+		"https://query1.finance.yahoo.com/v8/finance/chart/%s?interval=1d&period1=%d&period2=%d",
+		ticker, from.Unix(), to.Unix())
+
+	chart, err := fetchYahooChart(ctx, url, ticker)
+	if err != nil {
+		return nil, err
+	}
+	if len(chart.Chart.Result) == 0 || len(chart.Chart.Result[0].Indicators.Quote) == 0 {
+		return nil, nil
+	}
+
+	res := chart.Chart.Result[0]
+	closes := res.Indicators.Quote[0].Close
+	var points []PricePoint
+	for i, ts := range res.Timestamps {
+		if i >= len(closes) || closes[i] == nil || *closes[i] == 0 {
+			continue
+		}
+		points = append(points, PricePoint{
+			At:    time.Unix(ts, 0).UTC(),
+			Price: *closes[i],
+		})
+	}
+	return points, nil
+}
+
+func fetchYahoo(ctx context.Context, url, ticker string) (float64, error) {
+	chart, err := fetchYahooChart(ctx, url, ticker)
 	if err != nil {
 		return 0, err
 	}
-	req.Header.Set("User-Agent", "Mozilla/5.0")
-
-	resp, err := http.DefaultClient.Do(req)
-	if err != nil {
-		return 0, err
-	}
-	defer resp.Body.Close()
-
-	var chart yahooChart
-	if err := json.NewDecoder(resp.Body).Decode(&chart); err != nil {
-		return 0, fmt.Errorf("decode yahoo response: %w", err)
-	}
-	if chart.Chart.Error != nil {
-		return 0, fmt.Errorf("yahoo error: %s", chart.Chart.Error.Description)
-	}
 	if len(chart.Chart.Result) == 0 {
 		return 0, fmt.Errorf("no result for ticker %s", ticker)
 	}
-
 	price := chart.Chart.Result[0].Meta.RegularMarketPrice
 	if price == 0 {
 		return 0, fmt.Errorf("zero price for ticker %s", ticker)
 	}
 	return price, nil
 }
+
+func fetchYahooChart(ctx context.Context, url, ticker string) (*yahooChart, error) {
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
+	if err != nil {
+		return nil, err
+	}
+	req.Header.Set("User-Agent", "Mozilla/5.0")
+
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+
+	var chart yahooChart
+	if err := json.NewDecoder(resp.Body).Decode(&chart); err != nil {
+		return nil, fmt.Errorf("decode yahoo response: %w", err)
+	}
+	if chart.Chart.Error != nil {
+		return nil, fmt.Errorf("yahoo error: %s", chart.Chart.Error.Description)
+	}
+	return &chart, nil
+}
+
+// PricePoint est un prix à un instant donné, partagé entre les providers.
+type PricePoint struct {
+	At    time.Time
+	Price float64
+}