from __future__ import annotations

from datetime import datetime, timezone

from django.contrib.admin.sites import AdminSite
from django.test import TestCase

from pobsync_backend.admin import BackupRunAdmin, HostConfigAdmin, SnapshotRecordAdmin
from pobsync_backend.models import BackupRun, HostConfig, ScheduleConfig, SnapshotRecord


class AdminDisplayTests(TestCase):
    def test_host_admin_links_to_related_snapshots_and_runs(self) -> None:
        site = AdminSite()
        admin = HostConfigAdmin(HostConfig, site)
        host = HostConfig.objects.create(host="web-01", address="web-01.example.test")
        snapshot = SnapshotRecord.objects.create(
            host=host,
            kind="scheduled",
            dirname="20260519-021500Z__ABCDEFGH",
            path="/backups/web-01/scheduled/20260519-021500Z__ABCDEFGH",
        )
        BackupRun.objects.create(host=host, status=BackupRun.Status.SUCCESS, snapshot=snapshot)

        snapshot_link = str(admin.snapshot_count_link(host))
        run_link = str(admin.backup_run_count_link(host))

        self.assertIn("/admin/pobsync_backend/snapshotrecord/", snapshot_link)
        self.assertIn(f"host__id__exact={host.pk}", snapshot_link)
        self.assertIn(">1<", snapshot_link)
        self.assertIn("/admin/pobsync_backend/backuprun/", run_link)
        self.assertIn(f"host__id__exact={host.pk}", run_link)
        self.assertIn(">1<", run_link)

    def test_host_admin_summarizes_schedule_and_latest_run(self) -> None:
        site = AdminSite()
        admin = HostConfigAdmin(HostConfig, site)
        host = HostConfig.objects.create(host="web-01", address="web-01.example.test")

        self.assertEqual(admin.schedule_state(host), "none")

        ScheduleConfig.objects.create(host=host, cron_expr="15 2 * * *", enabled=True)
        host.refresh_from_db()
        BackupRun.objects.create(
            host=host,
            status=BackupRun.Status.SUCCESS,
            started_at=datetime(2026, 5, 19, 2, 15, tzinfo=timezone.utc),
        )

        self.assertEqual(admin.schedule_state(host), "15 2 * * *")
        self.assertEqual(admin.latest_run_state(host), "success 2026-05-19 02:15")

    def test_snapshot_admin_links_to_base_and_backup_runs(self) -> None:
        site = AdminSite()
        admin = SnapshotRecordAdmin(SnapshotRecord, site)
        host = HostConfig.objects.create(host="web-01", address="web-01.example.test")
        base = SnapshotRecord.objects.create(
            host=host,
            kind="scheduled",
            dirname="20260518-021500Z__BASESNAP",
            path="/backups/web-01/scheduled/20260518-021500Z__BASESNAP",
        )
        child = SnapshotRecord.objects.create(
            host=host,
            kind="scheduled",
            dirname="20260519-021500Z__CHILDSNP",
            path="/backups/web-01/scheduled/20260519-021500Z__CHILDSNP",
            base=base,
        )
        BackupRun.objects.create(host=host, status=BackupRun.Status.SUCCESS, snapshot=child)

        base_link = str(admin.base_link(child))
        run_link = str(admin.backup_run_count_link(child))

        self.assertIn(f"/admin/pobsync_backend/snapshotrecord/{base.pk}/change/", base_link)
        self.assertIn(base.dirname, base_link)
        self.assertIn("/admin/pobsync_backend/backuprun/", run_link)
        self.assertIn(f"snapshot__id__exact={child.pk}", run_link)
        self.assertIn(">1<", run_link)

    def test_backup_run_admin_links_to_snapshot(self) -> None:
        site = AdminSite()
        admin = BackupRunAdmin(BackupRun, site)
        host = HostConfig.objects.create(host="web-01", address="web-01.example.test")
        snapshot = SnapshotRecord.objects.create(
            host=host,
            kind="scheduled",
            dirname="20260519-021500Z__ABCDEFGH",
            path="/backups/web-01/scheduled/20260519-021500Z__ABCDEFGH",
        )
        run = BackupRun.objects.create(host=host, status=BackupRun.Status.SUCCESS, snapshot=snapshot)

        snapshot_link = str(admin.snapshot_link(run))

        self.assertIn(f"/admin/pobsync_backend/snapshotrecord/{snapshot.pk}/change/", snapshot_link)
        self.assertIn(snapshot.dirname, snapshot_link)