package storage

import (
	"strings"
	"testing"
)

// --- A1: the retry=0 knob (SPIKE-nas-verify Q4-vi) --------------------------------------------------

// TestMountOptions_NFSRetry0_SMBWithout: retry=0 is in the NFS option string (dead-NAS access 91 s →
// 3.8 s) and NOT in the SMB one (retry is a mount.nfs option; mount.cifs would reject the mount).
// Companion red-proof: revert the mountOptions NFS branch → the first assertion fails.
func TestMountOptions_NFSRetry0_SMBWithout(t *testing.T) {
	nfs := NetworkMountSpec{Name: "m", Protocol: ProtocolNFS, Server: "s", Export: "/e", MappedUID: 1000, MappedGID: 1000}
	if got := nfs.mountOptions(); !strings.Contains(got, ",retry=0") {
		t.Errorf("NFS options missing retry=0 (Q4-vi): %q", got)
	}
	smb := NetworkMountSpec{Name: "m", Protocol: ProtocolSMB, Server: "s", Export: "e",
		MappedUID: 1000, MappedGID: 1000, CredsRef: "/var/lib/felhom-agent/smb-creds/m.cred"}
	if got := smb.mountOptions(); strings.Contains(got, "retry=") {
		t.Errorf("SMB options must NOT carry retry= (mount.cifs rejects it): %q", got)
	}
}

// --- A2: the journal classifier (SPIKE-nas-verify Q4 — VERBATIM live strings) -----------------------

// TestClassifyNetVerifyFailure runs the Q4 taxonomy on the strings captured live in the spike.
// Companion red-proof: an exit-code-based classifier (every failure is rc=32) collapses smb_auth and
// smb_share into one code — modeled by replacing the body with `return NetVerifyMountFailed, ""`;
// every non-generic row fails.
func TestClassifyNetVerifyFailure(t *testing.T) {
	cases := []struct {
		name      string
		journal   string
		reachable bool
		want      string
	}{
		// Q4 i′ — unreachable with retry=0 (the production unit's shape).
		{"no route", "mount.nfs4: No route to host for 192.168.0.199:/srv/nope on /mnt/felhom-drives/x", false, NetVerifyUnreachable},
		{"conn refused", "mount.nfs4: Connection refused", false, NetVerifyUnreachable},
		{"conn timed out", "mount.nfs4: Connection timed out", false, NetVerifyUnreachable},
		// Q4 ii ≡ iii — the MERGED category: NFSv4 cannot distinguish no-export from not-permitted.
		{"nfs export missing", "mount.nfs4: mounting 192.168.0.180:/srv/nas-spike2/nope failed, reason given by server: No such file or directory", true, NetVerifyNFSExport},
		{"nfs export denied (identical string)", "mount.nfs4: mounting 192.168.0.180:/srv/nas-spike2/q4iii failed, reason given by server: No such file or directory", true, NetVerifyNFSExport},
		// Q4 iv / v — SMB splits cleanly on the errno line.
		{"smb wrong password", "mount error(13): Permission denied\nRefer to the mount.cifs(8) manual page", true, NetVerifySMBAuth},
		{"smb wrong share", "mount error(2): No such file or directory\nRefer to the mount.cifs(8) manual page", true, NetVerifySMBShare},
		// Q4 i (default retry) — systemd kills mount.nfs at its 90 s cap, no mount.nfs diagnostic.
		{"systemd timeout", "Mounting timed out. Terminating.\nMount process exited, code=killed, status=15/TERM", true, NetVerifyTimeout},
		// Degradations: nothing matched.
		{"empty journal, reachable", "", true, NetVerifyMountFailed},
		{"empty journal, unreachable", "", false, NetVerifyUnreachable},
		{"garbage, reachable", "some future mount.nfs5 wording", true, NetVerifyMountFailed},
	}
	for _, tc := range cases {
		t.Run(tc.name, func(t *testing.T) {
			code, hint := ClassifyNetVerifyFailure(tc.journal, tc.reachable)
			if code != tc.want {
				t.Errorf("ClassifyNetVerifyFailure(%q, reachable=%v) = %q, want %q", tc.journal, tc.reachable, code, tc.want)
			}
			if hint == "" {
				t.Errorf("hint must never be empty (code %q)", code)
			}
		})
	}
}

// TestClassify_SMBShareNeverShadowsNFS: the SMB error(2) line contains "No such file or directory"
// too — the NFS rule must key on the full "reason given by server:" fragment so neither shadows the
// other regardless of table order.
func TestClassify_SMBShareNeverShadowsNFS(t *testing.T) {
	code, _ := ClassifyNetVerifyFailure("mount error(2): No such file or directory", true)
	if code != NetVerifySMBShare {
		t.Errorf("SMB error(2) classified %q, want %q", code, NetVerifySMBShare)
	}
	code, _ = ClassifyNetVerifyFailure("failed, reason given by server: No such file or directory", true)
	if code != NetVerifyNFSExport {
		t.Errorf("NFS server-reason classified %q, want %q", code, NetVerifyNFSExport)
	}
}

// --- networkMountedIn: the §8 truth source (autofs trigger ≠ mounted) --------------------------------

func TestNetworkMountedIn(t *testing.T) {
	procMounts := `sysfs /sys sysfs rw 0 0
systemd-1 /mnt/felhom-drives/idle autofs rw,relatime,fd=86 0 0
systemd-1 /mnt/felhom-drives/live autofs rw,relatime,fd=86 0 0
192.168.0.180:/srv/media /mnt/felhom-drives/live nfs4 rw,noatime,vers=4.1,soft 0 0
//nas/share /mnt/felhom-drives/smb cifs rw,vers=3.0 0 0
/dev/sda1 /mnt/felhom-drives/disk ext4 rw 0 0
`
	cases := []struct {
		where string
		want  bool
	}{
		{"/mnt/felhom-drives/live", true},   // real nfs4 (the autofs line for the same path must not confuse it)
		{"/mnt/felhom-drives/smb", true},    // cifs
		{"/mnt/felhom-drives/idle", false},  // autofs trigger ONLY — idle automount is NOT mounted
		{"/mnt/felhom-drives/disk", false},  // a local fs at the path is not a network mount
		{"/mnt/felhom-drives/nope", false},  // absent
	}
	for _, tc := range cases {
		if got := networkMountedIn(procMounts, tc.where); got != tc.want {
			t.Errorf("networkMountedIn(%q) = %v, want %v", tc.where, got, tc.want)
		}
	}
}