// redis_options_test.go — FCB_REDIS_DB / URL 库号解析单测。
package cache

import "testing"

func TestBuildRedisOptionsPlainAddr(t *testing.T) {
	opts, err := buildRedisOptions("127.0.0.1:6379", 0)
	if err != nil {
		t.Fatalf("plain addr: %v", err)
	}
	if opts.DB != 0 {
		t.Fatalf("默认库号应为 0, got %d", opts.DB)
	}

	opts, err = buildRedisOptions("127.0.0.1:6379", 5)
	if err != nil {
		t.Fatalf("plain addr db=5: %v", err)
	}
	if opts.Addr != "127.0.0.1:6379" || opts.DB != 5 {
		t.Fatalf("host:port + db: got addr=%s db=%d", opts.Addr, opts.DB)
	}
}

func TestBuildRedisOptionsURL(t *testing.T) {
	cases := []struct {
		name    string
		url     string
		dbParam int
		wantDB  int
		wantPw  string
	}{
		{"URL 无库号用参数", "redis://127.0.0.1:6379", 3, 3, ""},
		{"URL 显式库号优先", "redis://127.0.0.1:6379/7", 3, 7, ""},
		{"URL 带密码", "redis://:secretpw@127.0.0.1:6379/2", 0, 2, "secretpw"},
		{"rediss 无库号用参数", "rediss://127.0.0.1:6379", 9, 9, ""},
		{"URL 根路径视为无库号", "redis://127.0.0.1:6379/", 4, 4, ""},
	}
	for _, tc := range cases {
		t.Run(tc.name, func(t *testing.T) {
			opts, err := buildRedisOptions(tc.url, tc.dbParam)
			if err != nil {
				t.Fatalf("buildRedisOptions(%q): %v", tc.url, err)
			}
			if opts.DB != tc.wantDB {
				t.Fatalf("db = %d, want %d", opts.DB, tc.wantDB)
			}
			if opts.Password != tc.wantPw {
				t.Fatalf("password = %q, want %q", opts.Password, tc.wantPw)
			}
			if opts.Addr != "127.0.0.1:6379" {
				t.Fatalf("addr = %q", opts.Addr)
			}
		})
	}
}

func TestBuildRedisOptionsInvalidURL(t *testing.T) {
	if _, err := buildRedisOptions("redis://[bad", 0); err == nil {
		t.Fatal("非法 URL 应报错")
	}
}

func TestURLHasDBPath(t *testing.T) {
	if urlHasDBPath("redis://h:6379") || urlHasDBPath("redis://h:6379/") {
		t.Fatal("无路径或根路径应视为 false")
	}
	if !urlHasDBPath("redis://h:6379/5") {
		t.Fatal("/5 应视为 true")
	}
}