package server

import (
	"context"
	"log"
	"time"

	"github.com/writekitapp/writekit/internal/tenant"
)

func (s *Server) StartAnalyticsSync() {
	if !s.cloudflare.IsConfigured() {
		return
	}

	go s.runAnalyticsSync()
}

func (s *Server) runAnalyticsSync() {
	ticker := time.NewTicker(24 * time.Hour)
	defer ticker.Stop()

	s.syncYesterdayAnalytics()

	for range ticker.C {
		s.syncYesterdayAnalytics()
	}
}

func (s *Server) syncYesterdayAnalytics() {
	ctx := context.Background()
	yesterday := time.Now().AddDate(0, 0, -1).Format("2006-01-02")

	tenants, err := s.database.ListTenants(ctx)
	if err != nil {
		log.Printf("analytics sync: list tenants: %v", err)
		return
	}

	for _, t := range tenants {
		s.syncTenantAnalytics(ctx, t.ID, t.Subdomain, yesterday)
	}

	demos, err := s.database.ListActiveDemos(ctx)
	if err != nil {
		log.Printf("analytics sync: list demos: %v", err)
		return
	}

	for _, d := range demos {
		s.syncTenantAnalytics(ctx, d.ID, d.Subdomain, yesterday)
	}
}

func (s *Server) syncTenantAnalytics(ctx context.Context, tenantID, subdomain, date string) {
	hostname := subdomain + "." + s.domain

	tenantDB, err := s.tenantPool.Get(tenantID)
	if err != nil {
		log.Printf("analytics sync: get tenant db %s: %v", tenantID, err)
		return
	}

	q := tenant.NewQueries(tenantDB)

	has, err := q.HasArchivedDate(ctx, date)
	if err != nil {
		log.Printf("analytics sync: check archived %s: %v", tenantID, err)
		return
	}
	if has {
		return
	}

	cfData, err := s.cloudflare.GetAnalytics(ctx, 1, hostname)
	if err != nil {
		log.Printf("analytics sync: fetch cf data %s: %v", tenantID, err)
		return
	}

	if cfData == nil || len(cfData.Daily) == 0 {
		return
	}

	day := cfData.Daily[0]
	archived := &tenant.ArchivedDay{
		Date:           day.Date,
		Requests:       day.Requests,
		PageViews:      day.PageViews,
		UniqueVisitors: day.Visitors,
		Bandwidth:      day.Bandwidth,
	}

	for _, b := range cfData.Browsers {
		archived.Browsers = append(archived.Browsers, tenant.NamedStat{Name: b.Name, Count: b.Count})
	}
	for _, o := range cfData.OS {
		archived.OS = append(archived.OS, tenant.NamedStat{Name: o.Name, Count: o.Count})
	}
	for _, d := range cfData.Devices {
		archived.Devices = append(archived.Devices, tenant.NamedStat{Name: d.Name, Count: d.Count})
	}
	for _, c := range cfData.Countries {
		archived.Countries = append(archived.Countries, tenant.NamedStat{Name: c.Name, Count: c.Count})
	}
	for _, p := range cfData.Paths {
		archived.Paths = append(archived.Paths, tenant.PageStats{Path: p.Path, Views: p.Requests})
	}

	if err := q.SaveDailyAnalytics(ctx, archived); err != nil {
		log.Printf("analytics sync: save archived %s: %v", tenantID, err)
	}
}