package handler

import (
	"net/http"
	"vctp/internal/report"
	"vctp/server/models"
)

// SnapshotMigrate rebuilds the snapshot registry and normalizes hourly table names.
// @Summary Migrate snapshot registry
// @Description Rebuilds the snapshot registry from existing tables and renames hourly tables to epoch-based names.
// @Tags snapshots
// @Produce json
// @Success 200 {object} models.SnapshotMigrationResponse "Migration results"
// @Failure 500 {object} models.SnapshotMigrationResponse "Server error"
// @Router /api/snapshots/migrate [post]
func (h *Handler) SnapshotMigrate(w http.ResponseWriter, r *http.Request) {
	ctx, cancel := withRequestTimeout(r, reportRequestTimeout)
	defer cancel()
	stats, err := report.MigrateSnapshotRegistry(ctx, h.Database)
	if err != nil {
		writeJSON(w, http.StatusInternalServerError, models.SnapshotMigrationResponse{
			Status: "ERROR",
			Error:  err.Error(),
			Stats: models.SnapshotMigrationStats{
				HourlyRenamed:     stats.HourlyRenamed,
				HourlyRegistered:  stats.HourlyRegistered,
				DailyRegistered:   stats.DailyRegistered,
				MonthlyRegistered: stats.MonthlyRegistered,
				Errors:            stats.Errors,
			},
		})
		return
	}

	writeJSON(w, http.StatusOK, models.SnapshotMigrationResponse{
		Status: "OK",
		Stats: models.SnapshotMigrationStats{
			HourlyRenamed:     stats.HourlyRenamed,
			HourlyRegistered:  stats.HourlyRegistered,
			DailyRegistered:   stats.DailyRegistered,
			MonthlyRegistered: stats.MonthlyRegistered,
			Errors:            stats.Errors,
		},
	})
}