package handlers

import (
	"net/http"
	"time"

	"git.eeqj.de/sneak/upaas/internal/models"
	"git.eeqj.de/sneak/upaas/templates"
)

// AppStats holds deployment statistics for an app.
type AppStats struct {
	App             *models.App
	LastDeployTime  *time.Time
	LastDeployISO   string
	LastDeployLabel string
	DeployCount     int
}

// HandleDashboard returns the dashboard handler.
func (h *Handlers) HandleDashboard() http.HandlerFunc {
	tmpl := templates.GetParsed()

	return func(writer http.ResponseWriter, request *http.Request) {
		ctx := request.Context()

		apps, fetchErr := models.AllApps(ctx, h.db)
		if fetchErr != nil {
			h.log.Error("failed to fetch apps", "error", fetchErr)
			http.Error(writer, "Internal Server Error", http.StatusInternalServerError)

			return
		}

		// Fetch stats for each app
		appStats := make([]*AppStats, 0, len(apps))

		for _, app := range apps {
			stats := &AppStats{App: app}

			// Get deploy count
			count, countErr := models.CountDeploymentsByAppID(ctx, h.db, app.ID)
			if countErr != nil {
				h.log.Error("failed to count deployments", "error", countErr, "app", app.ID)
			} else {
				stats.DeployCount = count
			}

			// Get latest deployment
			latest, latestErr := models.LatestDeploymentForApp(ctx, h.db, app.ID)
			if latestErr != nil {
				h.log.Error("failed to get latest deployment", "error", latestErr, "app", app.ID)
			} else if latest != nil {
				if latest.FinishedAt.Valid {
					stats.LastDeployTime = &latest.FinishedAt.Time
					stats.LastDeployISO = latest.FinishedAt.Time.Format(time.RFC3339)
					stats.LastDeployLabel = latest.FinishedAt.Time.Format("2006-01-02 15:04:05")
				} else {
					stats.LastDeployTime = &latest.StartedAt
					stats.LastDeployISO = latest.StartedAt.Format(time.RFC3339)
					stats.LastDeployLabel = latest.StartedAt.Format("2006-01-02 15:04:05")
				}
			}

			appStats = append(appStats, stats)
		}

		data := h.addGlobals(map[string]any{
			"AppStats": appStats,
		}, request)

		h.renderTemplate(writer, tmpl, "dashboard.html", data)
	}
}