restic-manager/internal/server/http/ui_schedules.go

package http

import (
	"errors"
	"fmt"
	"log/slog"
	stdhttp "net/http"
	"strconv"
	"strings"

	"github.com/go-chi/chi/v5"
	"github.com/oklog/ulid/v2"

	"gitea.dcglab.co.uk/steve/restic-manager/internal/api"
	"gitea.dcglab.co.uk/steve/restic-manager/internal/server/ui"
	"gitea.dcglab.co.uk/steve/restic-manager/internal/store"
)

// schedulesListPage carries everything the Schedules tab needs.
type schedulesListPage struct {
	Host             store.Host
	Schedules        []store.Schedule
	Version          int64
	AppliedVersion   int64
}

// scheduleEditPage drives both the Create form (Schedule.ID empty)
// and the Edit form (Schedule populated). Errors come back via Error
// to be rendered as a banner; FormValues holds the just-submitted
// raw fields so a failed POST can re-render with the operator's
// typed input still in place.
type scheduleEditPage struct {
	Host          store.Host
	IsNew         bool
	ScheduleID    string
	Error         string
	// Form values — strings so partial input survives validation
	// errors (e.g. operator typed "abc" into keep_last).
	CronExpr      string
	PathsRaw      string
	ExcludesRaw   string
	TagsRaw       string
	KeepLast      string
	KeepHourly    string
	KeepDaily     string
	KeepWeekly    string
	KeepMonthly   string
	KeepYearly    string
	LimitUpKBps   string
	LimitDownKBps string
	Enabled       bool
}

// handleUISchedulesList renders the Schedules sub-tab on a host.
func (s *Server) handleUISchedulesList(w stdhttp.ResponseWriter, r *stdhttp.Request) {
	u := s.requireUIUser(w, r)
	if u == nil {
		return
	}
	hostID := chi.URLParam(r, "id")
	host, err := s.deps.Store.GetHost(r.Context(), hostID)
	if err != nil {
		if errors.Is(err, store.ErrNotFound) {
			stdhttp.NotFound(w, r)
			return
		}
		stdhttp.Error(w, "internal", stdhttp.StatusInternalServerError)
		return
	}
	rows, err := s.deps.Store.ListSchedulesByHost(r.Context(), hostID)
	if err != nil {
		stdhttp.Error(w, "internal", stdhttp.StatusInternalServerError)
		return
	}
	version, _ := s.deps.Store.GetHostScheduleVersion(r.Context(), hostID)

	view := s.baseView(u, "dashboard")
	view.Title = host.Name + " · schedules · restic-manager"
	view.Page = schedulesListPage{
		Host:           *host,
		Schedules:      rows,
		Version:        version,
		AppliedVersion: host.AppliedScheduleVersion,
	}
	if err := s.deps.UI.Render(w, "schedules_list", view); err != nil {
		slog.Error("ui: render schedules_list", "err", err)
		stdhttp.Error(w, "internal", stdhttp.StatusInternalServerError)
	}
}

// handleUIScheduleNewGet renders the empty Create form.
func (s *Server) handleUIScheduleNewGet(w stdhttp.ResponseWriter, r *stdhttp.Request) {
	u := s.requireUIUser(w, r)
	if u == nil {
		return
	}
	hostID := chi.URLParam(r, "id")
	host, err := s.deps.Store.GetHost(r.Context(), hostID)
	if err != nil {
		if errors.Is(err, store.ErrNotFound) {
			stdhttp.NotFound(w, r)
			return
		}
		stdhttp.Error(w, "internal", stdhttp.StatusInternalServerError)
		return
	}
	view := s.baseView(u, "dashboard")
	view.Title = "New schedule · " + host.Name
	view.Page = scheduleEditPage{
		Host:     *host,
		IsNew:    true,
		CronExpr: "0 3 * * *",
		Enabled:  true,
	}
	s.renderScheduleEdit(w, view)
}

// handleUIScheduleEditGet renders the Edit form pre-filled from the
// existing schedule row.
func (s *Server) handleUIScheduleEditGet(w stdhttp.ResponseWriter, r *stdhttp.Request) {
	u := s.requireUIUser(w, r)
	if u == nil {
		return
	}
	hostID := chi.URLParam(r, "id")
	scheduleID := chi.URLParam(r, "sid")
	host, err := s.deps.Store.GetHost(r.Context(), hostID)
	if err != nil {
		if errors.Is(err, store.ErrNotFound) {
			stdhttp.NotFound(w, r)
			return
		}
		stdhttp.Error(w, "internal", stdhttp.StatusInternalServerError)
		return
	}
	sched, err := s.deps.Store.GetSchedule(r.Context(), hostID, scheduleID)
	if err != nil {
		if errors.Is(err, store.ErrNotFound) {
			stdhttp.NotFound(w, r)
			return
		}
		stdhttp.Error(w, "internal", stdhttp.StatusInternalServerError)
		return
	}
	page := scheduleEditPage{
		Host:        *host,
		IsNew:       false,
		ScheduleID:  sched.ID,
		CronExpr:    sched.CronExpr,
		PathsRaw:    strings.Join(sched.Paths, "\n"),
		ExcludesRaw: strings.Join(sched.Excludes, "\n"),
		TagsRaw:     strings.Join(sched.Tags, ", "),
		Enabled:     sched.Enabled,
	}
	page.KeepLast = intStringPtr(sched.RetentionPolicy.KeepLast)
	page.KeepHourly = intStringPtr(sched.RetentionPolicy.KeepHourly)
	page.KeepDaily = intStringPtr(sched.RetentionPolicy.KeepDaily)
	page.KeepWeekly = intStringPtr(sched.RetentionPolicy.KeepWeekly)
	page.KeepMonthly = intStringPtr(sched.RetentionPolicy.KeepMonthly)
	page.KeepYearly = intStringPtr(sched.RetentionPolicy.KeepYearly)
	page.LimitUpKBps = intStringPtr(sched.Options.LimitUploadKBps)
	page.LimitDownKBps = intStringPtr(sched.Options.LimitDownloadKBps)

	view := s.baseView(u, "dashboard")
	view.Title = "Edit schedule · " + host.Name
	view.Page = page
	s.renderScheduleEdit(w, view)
}

// handleUIScheduleSave handles POST for both create and update. The
// edit form posts to /hosts/{id}/schedules/new (for create) or
// /hosts/{id}/schedules/{sid}/edit (for update); we branch on whether
// {sid} is present in the route params.
func (s *Server) handleUIScheduleSave(w stdhttp.ResponseWriter, r *stdhttp.Request) {
	u := s.requireUIUser(w, r)
	if u == nil {
		return
	}
	hostID := chi.URLParam(r, "id")
	scheduleID := chi.URLParam(r, "sid")
	storeUser, _, err := s.userByID(r, u.ID)
	if err != nil || storeUser == nil {
		stdhttp.Error(w, "internal", stdhttp.StatusInternalServerError)
		return
	}
	host, err := s.deps.Store.GetHost(r.Context(), hostID)
	if err != nil {
		if errors.Is(err, store.ErrNotFound) {
			stdhttp.NotFound(w, r)
			return
		}
		stdhttp.Error(w, "internal", stdhttp.StatusInternalServerError)
		return
	}
	if err := r.ParseForm(); err != nil {
		stdhttp.Error(w, "bad request", stdhttp.StatusBadRequest)
		return
	}
	page := scheduleEditPage{
		Host:          *host,
		IsNew:         scheduleID == "",
		ScheduleID:    scheduleID,
		CronExpr:      strings.TrimSpace(r.PostForm.Get("cron_expr")),
		PathsRaw:      r.PostForm.Get("paths"),
		ExcludesRaw:   r.PostForm.Get("excludes"),
		TagsRaw:       strings.TrimSpace(r.PostForm.Get("tags")),
		KeepLast:      strings.TrimSpace(r.PostForm.Get("keep_last")),
		KeepHourly:    strings.TrimSpace(r.PostForm.Get("keep_hourly")),
		KeepDaily:     strings.TrimSpace(r.PostForm.Get("keep_daily")),
		KeepWeekly:    strings.TrimSpace(r.PostForm.Get("keep_weekly")),
		KeepMonthly:   strings.TrimSpace(r.PostForm.Get("keep_monthly")),
		KeepYearly:    strings.TrimSpace(r.PostForm.Get("keep_yearly")),
		LimitUpKBps:   strings.TrimSpace(r.PostForm.Get("limit_up_kbps")),
		LimitDownKBps: strings.TrimSpace(r.PostForm.Get("limit_down_kbps")),
		Enabled:       r.PostForm.Get("enabled") == "on",
	}

	// Convert the raw form values into store-shape data, surfacing
	// the first parse error as a banner.
	paths := splitPaths(page.PathsRaw)
	excludes := splitPaths(page.ExcludesRaw)
	tags := splitCSV(page.TagsRaw)

	retention, err := parseRetention(page)
	if err != nil {
		page.Error = err.Error()
		s.renderEditPage(w, u, page)
		return
	}
	options, err := parseOptions(page)
	if err != nil {
		page.Error = err.Error()
		s.renderEditPage(w, u, page)
		return
	}

	// Validate against the same rules the JSON API uses (cron, paths,
	// hooks-on-non-backup) — the UI only handles backup kind today,
	// so we hardcode kind=backup here.
	apiShape := scheduleAPI{
		Kind:     api.JobBackup,
		CronExpr: page.CronExpr,
		Paths:    paths,
	}
	if code, msg := validateSchedule(&apiShape); code != "" {
		page.Error = uiErrorMessage(code, msg)
		s.renderEditPage(w, u, page)
		return
	}

	if page.IsNew {
		row := store.Schedule{
			ID:              ulid.Make().String(),
			HostID:          hostID,
			Kind:            string(api.JobBackup),
			CronExpr:        page.CronExpr,
			Paths:           paths,
			Excludes:        excludes,
			Tags:            tags,
			RetentionPolicy: retention,
			Options:         options,
			Enabled:         page.Enabled,
		}
		if err := s.deps.Store.CreateSchedule(r.Context(), &row); err != nil {
			page.Error = "Couldn't save schedule — see server log."
			slog.Error("ui schedule create", "err", err)
			s.renderEditPage(w, u, page)
			return
		}
		_ = s.deps.Store.AppendAudit(r.Context(), store.AuditEntry{
			ID:         ulid.Make().String(),
			UserID:     &storeUser.ID,
			Actor:      "user",
			Action:     "schedule.created",
			TargetKind: ptr("schedule"),
			TargetID:   &row.ID,
			TS:         nowUTC(),
		})
		s.pushScheduleSetAsync(hostID)
	} else {
		existing, err := s.deps.Store.GetSchedule(r.Context(), hostID, scheduleID)
		if err != nil {
			if errors.Is(err, store.ErrNotFound) {
				stdhttp.NotFound(w, r)
				return
			}
			stdhttp.Error(w, "internal", stdhttp.StatusInternalServerError)
			return
		}
		existing.CronExpr = page.CronExpr
		existing.Paths = paths
		existing.Excludes = excludes
		existing.Tags = tags
		existing.RetentionPolicy = retention
		existing.Options = options
		existing.Enabled = page.Enabled
		if err := s.deps.Store.UpdateSchedule(r.Context(), existing); err != nil {
			page.Error = "Couldn't save schedule — see server log."
			slog.Error("ui schedule update", "err", err)
			s.renderEditPage(w, u, page)
			return
		}
		_ = s.deps.Store.AppendAudit(r.Context(), store.AuditEntry{
			ID:         ulid.Make().String(),
			UserID:     &storeUser.ID,
			Actor:      "user",
			Action:     "schedule.updated",
			TargetKind: ptr("schedule"),
			TargetID:   &scheduleID,
			TS:         nowUTC(),
		})
		s.pushScheduleSetAsync(hostID)
	}

	stdhttp.Redirect(w, r, "/hosts/"+hostID+"/schedules", stdhttp.StatusSeeOther)
}

// handleUIScheduleDelete is the POST target of the Delete buttons on
// the list view. Confirm-then-redirect; no AJAX.
func (s *Server) handleUIScheduleDelete(w stdhttp.ResponseWriter, r *stdhttp.Request) {
	u := s.requireUIUser(w, r)
	if u == nil {
		return
	}
	hostID := chi.URLParam(r, "id")
	scheduleID := chi.URLParam(r, "sid")
	storeUser, _, err := s.userByID(r, u.ID)
	if err != nil || storeUser == nil {
		stdhttp.Error(w, "internal", stdhttp.StatusInternalServerError)
		return
	}
	if err := s.deps.Store.DeleteSchedule(r.Context(), hostID, scheduleID); err != nil {
		if errors.Is(err, store.ErrNotFound) {
			stdhttp.NotFound(w, r)
			return
		}
		stdhttp.Error(w, "internal", stdhttp.StatusInternalServerError)
		return
	}
	_ = s.deps.Store.AppendAudit(r.Context(), store.AuditEntry{
		ID:         ulid.Make().String(),
		UserID:     &storeUser.ID,
		Actor:      "user",
		Action:     "schedule.deleted",
		TargetKind: ptr("schedule"),
		TargetID:   &scheduleID,
		TS:         nowUTC(),
	})
	s.pushScheduleSetAsync(hostID)
	stdhttp.Redirect(w, r, "/hosts/"+hostID+"/schedules", stdhttp.StatusSeeOther)
}

func (s *Server) renderScheduleEdit(w stdhttp.ResponseWriter, view ui.ViewData) {
	if err := s.deps.UI.Render(w, "schedule_edit", view); err != nil {
		slog.Error("ui: render schedule_edit", "err", err)
		stdhttp.Error(w, "internal", stdhttp.StatusInternalServerError)
	}
}

func (s *Server) renderEditPage(w stdhttp.ResponseWriter, u *ui.User, page scheduleEditPage) {
	view := s.baseView(u, "dashboard")
	if page.IsNew {
		view.Title = "New schedule · " + page.Host.Name
	} else {
		view.Title = "Edit schedule · " + page.Host.Name
	}
	view.Page = page
	w.WriteHeader(stdhttp.StatusUnprocessableEntity)
	s.renderScheduleEdit(w, view)
}

// ----- helpers --------------------------------------------------------

// splitCSV parses comma-separated values into a clean []string —
// leading/trailing whitespace trimmed, blanks dropped.
func splitCSV(s string) []string {
	out := []string{}
	for _, p := range strings.Split(s, ",") {
		if t := strings.TrimSpace(p); t != "" {
			out = append(out, t)
		}
	}
	return out
}

func parseRetention(p scheduleEditPage) (store.RetentionPolicy, error) {
	var r store.RetentionPolicy
	for _, f := range []struct {
		raw  string
		dest **int
		name string
	}{
		{p.KeepLast, &r.KeepLast, "keep last"},
		{p.KeepHourly, &r.KeepHourly, "keep hourly"},
		{p.KeepDaily, &r.KeepDaily, "keep daily"},
		{p.KeepWeekly, &r.KeepWeekly, "keep weekly"},
		{p.KeepMonthly, &r.KeepMonthly, "keep monthly"},
		{p.KeepYearly, &r.KeepYearly, "keep yearly"},
	} {
		v, err := parsePosInt(f.raw)
		if err != nil {
			return r, errFmtf("%s: %s", f.name, err)
		}
		*f.dest = v
	}
	return r, nil
}

func parseOptions(p scheduleEditPage) (store.ScheduleOptions, error) {
	var o store.ScheduleOptions
	up, err := parsePosInt(p.LimitUpKBps)
	if err != nil {
		return o, errFmtf("limit upload: %s", err)
	}
	o.LimitUploadKBps = up
	down, err := parsePosInt(p.LimitDownKBps)
	if err != nil {
		return o, errFmtf("limit download: %s", err)
	}
	o.LimitDownloadKBps = down
	return o, nil
}

// parsePosInt turns a possibly-empty string into *int. Empty → nil
// (no value). Non-empty must parse as a positive int.
func parsePosInt(raw string) (*int, error) {
	if raw == "" {
		return nil, nil
	}
	v, err := strconv.Atoi(raw)
	if err != nil {
		return nil, errFmtf("must be a whole number")
	}
	if v < 0 {
		return nil, errFmtf("must be non-negative")
	}
	return &v, nil
}

func intStringPtr(p *int) string {
	if p == nil {
		return ""
	}
	return strconv.Itoa(*p)
}

// uiErrorMessage maps the JSON-API validation codes to operator-
// friendly banner text.
func uiErrorMessage(code, msg string) string {
	switch code {
	case "missing_cron_expr":
		return "Cron expression is required."
	case "invalid_cron_expr":
		return "Cron expression doesn't parse: " + msg
	case "missing_paths":
		return "At least one backup path is required (one per line)."
	case "invalid_kind":
		return "Unsupported schedule kind."
	default:
		return msg
	}
}

// errFmtf wraps fmt.Errorf so the validators read consistently.
func errFmtf(format string, args ...any) error {
	return fmt.Errorf(format, args...)
}