package agentapi

import (
	"context"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"
)

// backupStub serves the agent's backup endpoints with the documented payload shapes so the client's
// parse + the trigger POST are asserted against real JSON (non-hollow).
func backupStub(t *testing.T, started chan<- struct{}) (*httptest.Server, string) {
	mux := http.NewServeMux()
	mux.HandleFunc("GET /backup/status", func(w http.ResponseWriter, r *http.Request) {
		_, _ = w.Write([]byte(`{"ok":true,"data":{"vmid":9201,"phase":"done","job_id":"backup-9201-1",` +
			`"backup":{"target_id":"local","vmid":9201,"archive":"local:backup/vzdump-lxc-9201-x.tar.zst",` +
			`"mode":"snapshot","crash_consistent":true,"size_bytes":1399160221,"success":true,` +
			`"started_at":"2026-06-12T07:37:41Z","duration_seconds":31.14}}}`))
	})
	mux.HandleFunc("GET /backup/due", func(w http.ResponseWriter, r *http.Request) {
		_, _ = w.Write([]byte(`{"ok":true,"data":{"vmid":9201,"due":false,"reason":"within cadence window","age_seconds":5234}}`))
	})
	mux.HandleFunc("GET /restore-test/status", func(w http.ResponseWriter, r *http.Request) {
		_, _ = w.Write([]byte(`{"ok":true,"data":{"restore_test":{"source_archive":"local:backup/x","source_tier":"local",` +
			`"pass":true,"verified":"boot+running","tested_at":"2026-06-11T03:00:00Z","duration_seconds":42.0}}}`))
	})
	mux.HandleFunc("POST /backup", func(w http.ResponseWriter, r *http.Request) {
		if started != nil {
			started <- struct{}{}
		}
		w.WriteHeader(http.StatusAccepted)
		_, _ = w.Write([]byte(`{"ok":true,"data":{"vmid":9201,"job_id":"backup-9201-2","phase":"running"}}`))
	})
	s := httptest.NewTLSServer(mux)
	return s, strings.TrimPrefix(s.URL, "https://")
}

func TestBackupStatus_ParsesRecord(t *testing.T) {
	s, ep := backupStub(t, nil)
	defer s.Close()
	c := clientFor(t, s, ep)

	st, err := c.BackupStatus(context.Background())
	if err != nil {
		t.Fatalf("BackupStatus: %v", err)
	}
	if st.Phase != "done" || st.JobID != "backup-9201-1" {
		t.Fatalf("status fields: %+v", st)
	}
	if st.Backup == nil {
		t.Fatal("expected a backup record")
	}
	if st.Backup.TargetID != "local" || st.Backup.Mode != "snapshot" || !st.Backup.Success {
		t.Fatalf("backup record: %+v", st.Backup)
	}
	if st.Backup.SizeBytes != 1399160221 || st.Backup.Archive == "" || st.Backup.StartedAt == "" {
		t.Fatalf("backup record details: %+v", st.Backup)
	}
}

func TestBackupDue_Parses(t *testing.T) {
	s, ep := backupStub(t, nil)
	defer s.Close()
	c := clientFor(t, s, ep)

	due, err := c.BackupDue(context.Background())
	if err != nil {
		t.Fatalf("BackupDue: %v", err)
	}
	if due.Due || due.Reason != "within cadence window" {
		t.Fatalf("due: %+v", due)
	}
}

func TestRestoreTestStatus_Parses(t *testing.T) {
	s, ep := backupStub(t, nil)
	defer s.Close()
	c := clientFor(t, s, ep)

	rt, err := c.RestoreTestStatus(context.Background())
	if err != nil {
		t.Fatalf("RestoreTestStatus: %v", err)
	}
	if rt == nil {
		t.Fatal("expected a restore-test record")
	}
	if !rt.Pass || rt.Verified != "boot+running" || rt.SourceTier != "local" {
		t.Fatalf("restore-test: %+v", rt)
	}
}

func TestRestoreTestStatus_Null(t *testing.T) {
	mux := http.NewServeMux()
	mux.HandleFunc("GET /restore-test/status", func(w http.ResponseWriter, r *http.Request) {
		_, _ = w.Write([]byte(`{"ok":true,"data":{"restore_test":null}}`))
	})
	s := httptest.NewTLSServer(mux)
	defer s.Close()
	c := clientFor(t, s, strings.TrimPrefix(s.URL, "https://"))

	rt, err := c.RestoreTestStatus(context.Background())
	if err != nil {
		t.Fatalf("RestoreTestStatus(null): %v", err)
	}
	if rt != nil {
		t.Fatalf("expected nil restore-test when none has run, got %+v", rt)
	}
}

// StartBackup must POST to /backup (the manual-trigger contract goes through this).
func TestStartBackup_PostsToBackup(t *testing.T) {
	started := make(chan struct{}, 1)
	s, ep := backupStub(t, started)
	defer s.Close()
	c := clientFor(t, s, ep)

	resp, err := c.StartBackup(context.Background())
	if err != nil {
		t.Fatalf("StartBackup: %v", err)
	}
	select {
	case <-started:
	default:
		t.Fatal("StartBackup did not POST to /backup")
	}
	if resp.JobID != "backup-9201-2" || resp.Phase != "running" {
		t.Fatalf("StartBackup response: %+v", resp)
	}
}