package config

import (
	"testing"

	"oneblog/internal/model"
)

func TestOverlayDBWinsEnvFallsBack(t *testing.T) {
	env := &Config{
		SiteURL:            "https://env.example",
		GitHubClientID:     "env-id",
		GitHubClientSecret: "env-sec",
		UploadsPublicBase:  "https://cdn.example/",
	}
	st := model.Settings{
		SiteURL:            "https://db.example",
		GitHubClientSecret: "db-sec",
	}
	got := env.Overlay(st)
	if got.SiteURL != "https://db.example" {
		t.Errorf("SiteURL = %q, want db value", got.SiteURL)
	}
	if got.GitHubClientID != "env-id" {
		t.Errorf("GitHubClientID = %q, want env fallback", got.GitHubClientID)
	}
	if got.GitHubClientSecret != "db-sec" {
		t.Errorf("GitHubClientSecret = %q, want db value", got.GitHubClientSecret)
	}
	// env 原件不能被改掉
	if env.SiteURL != "https://env.example" {
		t.Error("Overlay must not mutate the env config")
	}
}

// 存储端按凭据齐全与否重新判定，与 config.Load 的规则一致。
func TestOverlayStorageCompleteness(t *testing.T) {
	env := &Config{DataDir: "/tmp/one"}
	full := model.Settings{
		S3Endpoint:  "https://acct.r2.cloudflarestorage.com",
		R2Bucket:    "b",
		R2AccessKey: "ak",
		R2SecretKey: "sk",
	}
	if c := env.Overlay(full); c.StorageDriver != "r2" {
		t.Errorf("complete R2 set: driver = %q, want r2", c.StorageDriver)
	}
	partial := full
	partial.R2SecretKey = ""
	if c := env.Overlay(partial); c.StorageDriver != "local" {
		t.Errorf("incomplete R2 set: driver = %q, want local", c.StorageDriver)
	}
}