package config

import (
	"strings"
	"testing"
	"time"
)

// 本文件钉住切片 WS1-A 的两个配置键：`WEB_SEARCH_ENDPOINT`（默认 = 本机兜底）与
// `WEB_SEARCH_TIMEOUT`（可选，未配置 = 沿用 io 包既有超时）。
//
// 关闭语义（空串 / off / none）由 ResolveEndpoint 定死：组合根据此**不注册**
// web-search 工具，因此这三种写法必须与「可用端点」区分得干干净净。

// TestWebSearch_DefaultEndpointIsLocalFallback 钉住默认值字面量：模板与代码承诺的
// 就是本机兜底地址（scripts/searxng/settings.yml 的配套实例）。
func TestWebSearch_DefaultEndpointIsLocalFallback(t *testing.T) {
	t.Parallel()
	cfg, err := Load(writeEnvFile(t, "JWT_SECRET="+strings.Repeat("s", 40)+"\n"))
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	const want = "http://127.0.0.1:38471"
	if cfg.WebSearch.Endpoint != want {
		t.Fatalf("WEB_SEARCH_ENDPOINT 默认值 = %q, want %q", cfg.WebSearch.Endpoint, want)
	}
	decision := cfg.WebSearch.ResolveEndpoint()
	if !decision.Enabled || decision.URL != want {
		t.Fatalf("默认端点必须可用: %+v", decision)
	}
	// 未配置超时 = 零值 ⇒ 沿用 io 包既有超时（本层不得另造默认值）。
	if cfg.WebSearch.Timeout != 0 {
		t.Fatalf("WEB_SEARCH_TIMEOUT 未配置时应为零值，got %v", cfg.WebSearch.Timeout)
	}
}

// TestWebSearch_EnvOverridesEndpointAndTimeout 钉住两个键都能被 .env 覆盖。
func TestWebSearch_EnvOverridesEndpointAndTimeout(t *testing.T) {
	t.Parallel()
	cfg, err := Load(writeEnvFile(t, strings.Join([]string{
		"JWT_SECRET=" + strings.Repeat("s", 40),
		"WEB_SEARCH_ENDPOINT=https://searx.example.com/search",
		"WEB_SEARCH_TIMEOUT=25s",
		"",
	}, "\n")))
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	if cfg.WebSearch.Endpoint != "https://searx.example.com/search" {
		t.Fatalf("Endpoint = %q", cfg.WebSearch.Endpoint)
	}
	if cfg.WebSearch.Timeout != 25*time.Second {
		t.Fatalf("Timeout = %v, want 25s", cfg.WebSearch.Timeout)
	}
}

// TestWebSearch_ExplicitEmptyMeansOff 钉住「写了键但留空 = 关闭」，它与「没写这个键
// （⇒ 默认兜底）」是两件事：前者必须让工具从注册面消失，后者必须开箱可用。
func TestWebSearch_ExplicitEmptyMeansOff(t *testing.T) {
	t.Parallel()
	cfg, err := Load(writeEnvFile(t, strings.Join([]string{
		"JWT_SECRET=" + strings.Repeat("s", 40),
		"WEB_SEARCH_ENDPOINT=",
		"",
	}, "\n")))
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	if cfg.WebSearch.Endpoint != "" {
		t.Fatalf("显式留空后 Endpoint = %q, want \"\"", cfg.WebSearch.Endpoint)
	}
	decision := cfg.WebSearch.ResolveEndpoint()
	if decision.Enabled || decision.Reason != WebSearchReasonOff {
		t.Fatalf("空串必须是「显式关闭」: %+v", decision)
	}
}

// TestWebSearch_InvalidTimeoutFailsLoad 钉住非法 duration 的明确行为：启动即报错
// （fail fast），绝不静默当成 0 或别的值。
func TestWebSearch_InvalidTimeoutFailsLoad(t *testing.T) {
	t.Parallel()
	_, err := Load(writeEnvFile(t, strings.Join([]string{
		"JWT_SECRET=" + strings.Repeat("s", 40),
		"WEB_SEARCH_TIMEOUT=25",
		"",
	}, "\n")))
	if err == nil {
		t.Fatal("WEB_SEARCH_TIMEOUT=25 不是合法 duration，Load 必须报错而不是静默取值")
	}
	if !strings.Contains(err.Error(), "WEB_SEARCH_TIMEOUT") {
		t.Fatalf("错误信息必须点出是哪个键: %v", err)
	}
}

// TestWebSearchConfig_ResolveEndpoint 是关闭 / 非法 / 可用三种去处的表驱动裁决。
func TestWebSearchConfig_ResolveEndpoint(t *testing.T) {
	t.Parallel()
	cases := []struct {
		name        string
		endpoint    string
		wantEnabled bool
		wantURL     string
		wantReason  string
	}{
		{"空串 = 关闭", "", false, "", WebSearchReasonOff},
		{"off", "off", false, "", WebSearchReasonOff},
		{"none", "none", false, "", WebSearchReasonOff},
		{"大写 OFF", "OFF", false, "", WebSearchReasonOff},
		{"带空白 None", "  None  ", false, "", WebSearchReasonOff},
		{"http 可用", "http://127.0.0.1:38471", true, "http://127.0.0.1:38471", ""},
		{"https 带路径", "https://searx.example.com/search", true, "https://searx.example.com/search", ""},
		{"周围空白被裁掉", " http://searx.example.com ", true, "http://searx.example.com", ""},
		{"scheme 非 http(s)", "ftp://searx.example.com", false, "", WebSearchReasonInvalid},
		{"缺主机", "http:///search", false, "", WebSearchReasonInvalid},
		{"裸 host:port", "127.0.0.1:38471", false, "", WebSearchReasonInvalid},
		{"纯文字", "searx", false, "", WebSearchReasonInvalid},
	}
	for _, tc := range cases {
		tc := tc
		t.Run(tc.name, func(t *testing.T) {
			t.Parallel()
			got := WebSearchConfig{Endpoint: tc.endpoint}.ResolveEndpoint()
			if got.Enabled != tc.wantEnabled || got.URL != tc.wantURL || got.Reason != tc.wantReason {
				t.Fatalf("ResolveEndpoint(%q) = %+v, want {Enabled:%v URL:%q Reason:%q}",
					tc.endpoint, got, tc.wantEnabled, tc.wantURL, tc.wantReason)
			}
		})
	}
}