package server

import (
	"fmt"
	"os"
	"time"

	"task/internal/sqlite"
	"task/internal/ticket"
)

// SeedDemo populates sample users/projects/tickets when the DB has no projects yet.
// No external backends (YouTrack etc.) — the web UI talks only to this tm_server.
func (s *Server) SeedDemo() error {
	projects, err := s.Projects.List()
	if err != nil {
		return err
	}
	if len(projects) > 0 {
		return nil
	}

	users, err := s.DB.ListUsers()
	if err != nil {
		return err
	}
	if len(users) == 0 {
		return fmt.Errorf("seed: no users (bootstrap admin first)")
	}
	admin := users[0]
	for _, u := range users {
		if u.IsAdmin {
			admin = u
			break
		}
	}

	member, err := s.DB.CreateUser("alice", "alice", false)
	if err != nil {
		member, err = s.DB.GetUserByUsername("alice")
		if err != nil {
			return fmt.Errorf("seed alice: %w", err)
		}
	}

	type seedTicket struct {
		Title, Desc string
		Status      ticket.Status
	}
	demos := []struct {
		Name    string
		Tickets []seedTicket
	}{
		{
			Name: "Test",
			Tickets: []seedTicket{
				{Title: "Board & Login prüfen", Desc: "Mit admin/admin einloggen, Board öffnen, Status ändern.\n\n- [ ] Login\n- [ ] Ticket editieren\n- [ ] Timer starten", Status: ticket.StatusInProgress},
				{Title: "Zeit auf Ticket buchen", Desc: "Im Ticket-Detail Timer oder manuelle Minuten buchen, dann Report prüfen.", Status: ticket.StatusTodo},
				{Title: "Members & Rechte", Desc: "alice als Member ist schon angelegt — Memberships-Tab ansehen.", Status: ticket.StatusTodo},
				{Title: "TUI anbinden", Desc: "Settings → Token (write) erzeugen → in `tm` Projekt-Edit backend=taskmaster eintragen (URL, Token, diese Project-ID).", Status: ticket.StatusTodo},
				{Title: "Seed abgeschlossen", Desc: "Beispiel-Ticket im Status DONE.", Status: ticket.StatusDone},
			},
		},
		{
			Name: "Website Relaunch",
			Tickets: []seedTicket{
				{Title: "Landing Hero entwerfen", Desc: "Dunkles Layout, klare CTAs.\n\n- [ ] Moodboard\n- [ ] Wireframe", Status: ticket.StatusInProgress},
				{Title: "CMS-Inhalte migrieren", Desc: "Alte Seiten nach Markdown überführen.", Status: ticket.StatusTodo},
				{Title: "Impressum & Datenschutz", Desc: "Rechtstexte finalisieren.", Status: ticket.StatusDone},
			},
		},
		{
			Name: "API Platform",
			Tickets: []seedTicket{
				{Title: "Auth-Middleware härten", Desc: "Session-Cookies dokumentieren.", Status: ticket.StatusInProgress},
				{Title: "Rate-Limits festlegen", Desc: "Pro User und pro IP.", Status: ticket.StatusTodo},
				{Title: "Health-Check", Desc: "Bereits live.", Status: ticket.StatusDone},
			},
		},
	}

	now := time.Now().UTC()
	for _, d := range demos {
		p, err := s.Projects.Create("", d.Name)
		if err != nil {
			return err
		}
		_ = s.DB.SetMember(p.ID, admin.ID, sqlite.RoleOwner)
		_ = s.DB.SetMember(p.ID, member.ID, sqlite.RoleMember)
		// Explicit local-only sync (no remote backend in the test environment).
		_ = s.Projects.SetSyncBackend(sqlite.SyncBackend{
			ProjectID: p.ID,
			Kind:      "none",
		})

		var firstID string
		for i, st := range d.Tickets {
			t, err := s.Tickets.Create(ticket.Ticket{
				Title:       st.Title,
				Description: st.Desc,
				Status:      st.Status,
				ProjectID:   p.ID,
			})
			if err != nil {
				return err
			}
			_, _ = s.DB.AppendRevision("ticket", t.ID, p.ID, "seed", admin.ID, t)
			if i == 0 {
				firstID = t.ID
			}
		}
		if firstID != "" {
			_, err := s.Times.Create(ticket.TimeEntry{
				TicketID:  firstID,
				ProjectID: p.ID,
				Start:     now.Add(-2 * time.Hour),
				End:       now.Add(-90 * time.Minute),
				Duration:  30 * time.Minute,
				Source:    ticket.SourceManual,
				Note:      "seed",
			})
			if err != nil {
				return err
			}
		}
	}

	fmt.Fprintf(os.Stderr, "seeded demo: Test + sample projects (users %s + alice/alice), sync=none\n", admin.Username)
	return nil
}