package handlers

import (
	"net/http"
	"os"

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

type debugLogsResponse struct {
	Logs string `json:"logs"`
}

// @Summary Lire les logs backend
// @Tags Debug
// @Produce json
// @Success 200 {object} debugLogsResponse
// @Failure 500 {object} map[string]string
// @Router /debug/logs [get]
func (h *Handler) GetDebugLogs(c *gin.Context) {
	logs, err := readLogTail()
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"erreur": "impossible de lire les logs"})
		return
	}
	c.JSON(http.StatusOK, debugLogsResponse{Logs: logs})
}

func debugLogPath() string {
	value := os.Getenv("DEBUG_LOG_PATH")
	if value == "" {
		return "./data/logs/backend.log"
	}
	return value
}

func readLogTail() (string, error) {
	path := debugLogPath()
	data, err := os.ReadFile(path)
	if err != nil {
		if os.IsNotExist(err) {
			return "", nil
		}
		return "", err
	}

	const maxBytes = 20000
	if len(data) > maxBytes {
		data = data[len(data)-maxBytes:]
	}
	return string(data), nil
}