package store

import (
	"context"
	"errors"
	"testing"
	"time"
)

// makeSchedHost is a minimal host row to hang schedule tests off.
func makeSchedHost(t *testing.T, s *Store) string {
	t.Helper()
	const id = "01HSCHEDHOST0000000000000"
	if err := s.CreateHost(context.Background(), Host{
		ID: id, Name: "sched-host", OS: "linux", Arch: "amd64",
		AgentVersion: "dev", ResticVersion: "0.16.0", ProtocolVersion: 1,
		EnrolledAt: time.Now().UTC(),
	}, "tokenhash", ""); err != nil {
		t.Fatalf("create host: %v", err)
	}
	return id
}

// makeGroup is a minimal source-group helper for schedule tests
// (schedules need at least one group to point at).
func makeGroup(t *testing.T, s *Store, hostID, name, id string) string {
	t.Helper()
	if err := s.CreateSourceGroup(context.Background(), &SourceGroup{
		ID: id, HostID: hostID, Name: name,
		Includes: []string{"/etc"},
	}); err != nil {
		t.Fatalf("create group %s: %v", name, err)
	}
	return id
}

func TestSchedulesCRUDAndVersionBump(t *testing.T) {
	t.Parallel()
	s := openTestStore(t)
	ctx := context.Background()
	hostID := makeSchedHost(t, s)
	gid := makeGroup(t, s, hostID, "default", "01HSCHEDGRP00000000000001")

	// Group creation already bumped version to 1.
	v, _ := s.GetHostScheduleVersion(ctx, hostID)
	if v != 1 {
		t.Fatalf("version after group create: got %d, want 1", v)
	}

	sched := Schedule{
		ID: "01SCHED000000000000000001", HostID: hostID,
		CronExpr:       "0 3 * * *",
		Enabled:        true,
		SourceGroupIDs: []string{gid},
	}
	if err := s.CreateSchedule(ctx, &sched); err != nil {
		t.Fatalf("create: %v", err)
	}
	if sched.CreatedAt.IsZero() || sched.UpdatedAt.IsZero() {
		t.Fatalf("Create should populate timestamps")
	}

	v, _ = s.GetHostScheduleVersion(ctx, hostID)
	if v != 2 {
		t.Fatalf("version after schedule create: got %d, want 2", v)
	}

	// Round-trip read — junction populated.
	got, err := s.GetSchedule(ctx, hostID, sched.ID)
	if err != nil {
		t.Fatalf("get: %v", err)
	}
	if got.CronExpr != "0 3 * * *" || len(got.SourceGroupIDs) != 1 || got.SourceGroupIDs[0] != gid {
		t.Fatalf("round-trip: %+v", got)
	}

	list, err := s.ListSchedulesByHost(ctx, hostID)
	if err != nil || len(list) != 1 || list[0].ID != sched.ID {
		t.Fatalf("list: err=%v rows=%v", err, list)
	}

	// Update — flip enabled, swap junction (re-add same gid). Version bumps.
	sched.CronExpr = "*/30 * * * *"
	sched.Enabled = false
	if err := s.UpdateSchedule(ctx, &sched); err != nil {
		t.Fatalf("update: %v", err)
	}
	v, _ = s.GetHostScheduleVersion(ctx, hostID)
	if v != 3 {
		t.Fatalf("version after update: got %d, want 3", v)
	}
	got, _ = s.GetSchedule(ctx, hostID, sched.ID)
	if got.CronExpr != "*/30 * * * *" || got.Enabled {
		t.Fatalf("update did not persist: %+v", got)
	}

	// Delete bumps version, returns ErrNotFound on second try.
	if err := s.DeleteSchedule(ctx, hostID, sched.ID); err != nil {
		t.Fatalf("delete: %v", err)
	}
	v, _ = s.GetHostScheduleVersion(ctx, hostID)
	if v != 4 {
		t.Fatalf("version after delete: got %d, want 4", v)
	}
	if err := s.DeleteSchedule(ctx, hostID, sched.ID); !errors.Is(err, ErrNotFound) {
		t.Fatalf("delete after delete: want ErrNotFound, got %v", err)
	}
}

func TestSchedulesUsingGroup(t *testing.T) {
	t.Parallel()
	s := openTestStore(t)
	ctx := context.Background()
	hostID := makeSchedHost(t, s)
	g1 := makeGroup(t, s, hostID, "default", "01HUSEGRPGRP000000000001")
	g2 := makeGroup(t, s, hostID, "databases", "01HUSEGRPGRP000000000002")

	// Schedule A points at g1 only; Schedule B points at both.
	if err := s.CreateSchedule(ctx, &Schedule{
		ID: "01HUSEGRPSCHED0000000001", HostID: hostID,
		CronExpr: "@hourly", Enabled: true,
		SourceGroupIDs: []string{g1},
	}); err != nil {
		t.Fatal(err)
	}
	if err := s.CreateSchedule(ctx, &Schedule{
		ID: "01HUSEGRPSCHED0000000002", HostID: hostID,
		CronExpr: "0 3 * * *", Enabled: true,
		SourceGroupIDs: []string{g1, g2},
	}); err != nil {
		t.Fatal(err)
	}

	g1Sched, err := s.SchedulesUsingGroup(ctx, g1)
	if err != nil {
		t.Fatal(err)
	}
	if len(g1Sched) != 2 {
		t.Fatalf("g1 should be in 2 schedules, got %d", len(g1Sched))
	}
	g2Sched, err := s.SchedulesUsingGroup(ctx, g2)
	if err != nil {
		t.Fatal(err)
	}
	if len(g2Sched) != 1 {
		t.Fatalf("g2 should be in 1 schedule, got %d", len(g2Sched))
	}
}

func TestSetHostAppliedScheduleVersion(t *testing.T) {
	t.Parallel()
	s := openTestStore(t)
	ctx := context.Background()
	hostID := makeSchedHost(t, s)

	if err := s.SetHostAppliedScheduleVersion(ctx, hostID, 42); err != nil {
		t.Fatal(err)
	}
	host, err := s.GetHost(ctx, hostID)
	if err != nil {
		t.Fatal(err)
	}
	if host.AppliedScheduleVersion != 42 {
		t.Fatalf("got %d, want 42", host.AppliedScheduleVersion)
	}
}