package api

import (
	"os"
	"path/filepath"
	"testing"
)

func TestDBFileBytes(t *testing.T) {
	dir := t.TempDir()
	dbPath := filepath.Join(dir, "app.db")
	mustWrite := func(p string, n int) {
		t.Helper()
		if err := os.WriteFile(p, make([]byte, n), 0o600); err != nil {
			t.Fatalf("write %s: %v", p, err)
		}
	}
	mustWrite(dbPath, 100)
	mustWrite(dbPath+"-wal", 30)

	cases := []struct {
		name   string
		driver string
		path   string
		want   int64
	}{
		{name: "sqlite 主文件加 wal", driver: "sqlite", path: dbPath, want: 130},
		{name: "sqlite 文件不存在计 0", driver: "sqlite", path: filepath.Join(dir, "none.db"), want: 0},
		{name: "外部数据库不可度量", driver: "postgres", path: "", want: -1},
		{name: "路径为空不可度量", driver: "sqlite", path: "", want: -1},
	}
	for _, tc := range cases {
		t.Run(tc.name, func(t *testing.T) {
			if got := dbFileBytes(tc.driver, tc.path); got != tc.want {
				t.Fatalf("dbFileBytes(%q, %q) = %d, want %d", tc.driver, tc.path, got, tc.want)
			}
		})
	}
}

func TestResourcesSnapshot(t *testing.T) {
	SetAboutRuntime("sqlite", filepath.Join(t.TempDir(), "absent.db"))
	got := resourcesSnapshot()

	if got["numCpu"].(int) < 1 || got["goroutines"].(int) < 1 {
		t.Fatalf("numCpu / goroutines 应为正数: %+v", got)
	}
	if got["memHeapBytes"].(uint64) == 0 || got["memSysBytes"].(uint64) == 0 {
		t.Fatalf("内存指标应为正数: %+v", got)
	}
	if got["cpuAvgPercent"].(float64) < 0 {
		t.Fatalf("cpuAvgPercent 不应为负: %+v", got)
	}
	if got["dbEngine"].(string) != "sqlite" || got["dbBytes"].(int64) != 0 {
		t.Fatalf("存储指标不符: %+v", got)
	}
}
