package db

import (
	"testing"
)

func TestDecodeTagsEdgeCases(t *testing.T) {
	tests := []struct {
		name string
		raw  string
		want int
	}{
		{"empty", "", 0},
		{"brackets", "[]", 0},
		{"whitespace", "  []  ", 0},
		{"valid", `["a","b"]`, 2},
		{"invalid json", "{not-json", 0},
	}
	for _, tc := range tests {
		t.Run(tc.name, func(t *testing.T) {
			got := decodeTags(tc.raw)
			if len(got) != tc.want {
				t.Fatalf("decodeTags(%q) len=%d want %d (%v)", tc.raw, len(got), tc.want, got)
			}
		})
	}
}

func TestEncodeTagsEmpty(t *testing.T) {
	if got := encodeTags(nil); got != "[]" {
		t.Fatalf("encodeTags(nil) = %q want []", got)
	}
	if got := encodeTags([]string{}); got != "[]" {
		t.Fatalf("encodeTags(empty) = %q want []", got)
	}
}

func TestGetAgentInvalidTagsInDB(t *testing.T) {
	d := openTestDB(t)
	seedAgent(t, d, "bad-tags")

	if _, err := d.Exec(`UPDATE agents SET tags = ? WHERE id = ?`, "{invalid", "bad-tags"); err != nil {
		t.Fatal(err)
	}

	got, err := d.GetAgent("bad-tags")
	if err != nil {
		t.Fatal(err)
	}
	if len(got.Tags) != 0 {
		t.Fatalf("invalid tags should decode to empty slice, got %v", got.Tags)
	}
}

func TestUpdateAgentMetaClearsTags(t *testing.T) {
	d := openTestDB(t)
	seedAgent(t, d, "meta-clear")

	if err := d.UpdateAgentMeta("meta-clear", "note", []string{"x"}); err != nil {
		t.Fatal(err)
	}
	if err := d.UpdateAgentMeta("meta-clear", "", nil); err != nil {
		t.Fatal(err)
	}

	got, err := d.GetAgent("meta-clear")
	if err != nil {
		t.Fatal(err)
	}
	if got.Notes != "" {
		t.Fatalf("notes not cleared: %q", got.Notes)
	}
	if len(got.Tags) != 0 {
		t.Fatalf("tags not cleared: %v", got.Tags)
	}
}