package backup

import (
	"testing"
	"time"
)

// After a controller restart the Backup → Apps „Databases" table is SYNTHESISED from the dump files on disk (the last
// run's result is not in memory). Seen 2026-10-10 on demo-hp after the 0.305.0 delivery: every `pre-restore-` undo copy
// (R-379) was listed as one more row of the night's run — adventurelog four times, bookstack four times, each stamped
// with the run's time. An undo copy is not part of any run: it stays in the file list (its visibility is a recorded
// decision), but the run table shows one row per database, the newest real dump.
func TestSynthesisedRunListsNoUndoCopy(t *testing.T) {
	m, _ := newTestManager(t, "/srv/sys")
	night := time.Date(2026, 10, 10, 2, 15, 0, 0, time.UTC)
	m.cachedStatus = &FullBackupStatus{DumpFiles: []DumpFileInfo{
		{StackName: "adventurelog", DBType: DBTypePostgres, FileName: "adventurelog-postgres.sql", ModTime: night},
		{StackName: "adventurelog", DBType: DBTypePostgres, FileName: "pre-restore-20260913T193505Z-adventurelog-postgres.sql", ModTime: night.AddDate(0, 0, -27), IsUndo: true},
		{StackName: "adventurelog", DBType: DBTypePostgres, FileName: "pre-restore-20260928T021839Z-adventurelog-postgres.sql", ModTime: night.AddDate(0, 0, -12), IsUndo: true},
		{StackName: "bookstack", DBType: DBTypeMariaDB, FileName: "bookstack-mariadb.sql", ModTime: night},
		{StackName: "bookstack", DBType: DBTypeMariaDB, FileName: "pre-restore-20260930T113419Z-bookstack-mariadb.sql", ModTime: night.AddDate(0, 0, -10), IsUndo: true},
	}}
	st := m.GetFullStatus(time.Time{})
	if st.LastDBDump == nil {
		t.Fatal("no synthesised run")
	}
	per := map[string]int{}
	for _, r := range st.LastDBDump.Results {
		per[r.DB.StackName]++
		if r.FilePath != "adventurelog-postgres.sql" && r.FilePath != "bookstack-mariadb.sql" {
			t.Errorf("an undo copy is listed as a row of the run: %s", r.FilePath)
		}
	}
	if per["adventurelog"] != 1 || per["bookstack"] != 1 || len(st.LastDBDump.Results) != 2 {
		t.Errorf("want one row per database (2), got %d: %v", len(st.LastDBDump.Results), per)
	}
	if !st.LastDBDump.LastRun.Equal(night) {
		t.Errorf("the run time must come from the real dumps: %v", st.LastDBDump.LastRun)
	}
	if len(st.DumpFiles) != 5 {
		t.Errorf("the file list must keep every file, undo copies included (R-379): %d", len(st.DumpFiles))
	}
}

// Only undo copies on disk: there is no run to show, so no synthesised run (a zero-time „last backup" would be a lie).
func TestSynthesisedRunAbsentWhenOnlyUndoCopies(t *testing.T) {
	m, _ := newTestManager(t, "/srv/sys")
	m.cachedStatus = &FullBackupStatus{DumpFiles: []DumpFileInfo{
		{StackName: "bookstack", DBType: DBTypeMariaDB, FileName: "pre-restore-20260930T113419Z-bookstack-mariadb.sql", ModTime: time.Now(), IsUndo: true},
	}}
	if st := m.GetFullStatus(time.Time{}); st.LastDBDump != nil {
		t.Errorf("a run was synthesised from undo copies alone: %+v", st.LastDBDump)
	}
}