package gateway

import (
	"encoding/json"
	"io"
	"net/http"
	"strings"
	"testing"
	"time"

	"git.yeij.top/AskaEth/Cyrene_v2/internal/auth"
	"git.yeij.top/AskaEth/Cyrene_v2/internal/logger"
)

// logEnvelope 解码日志尾部端点的 {data:[...]} 信封。
type logEnvelope struct {
	Data []AdminLogEntry `json:"data"`
}

// logsServer 构建一个网关，注入了已由真实 logger 喂入的日志
// 环形缓冲，因此该端点是针对生产捕获路径演练的。
func logsServer(t *testing.T) (*Server, string, string) {
	t.Helper()
	srv, ts, jwt := buildEnv(t, cfgDefault(), Deps{})
	ring := logger.NewRingBuffer(16)
	log := logger.New(logger.Options{Level: "debug", Format: "text", Out: io.Discard, Ring: ring})
	log.Info("boot ok")
	logger.WithSource(log, "gateway").Warn("slow request")
	logger.WithSource(log, "runtime/loop").Error("loop crashed")
	srv.SetLogBuffer(ring)
	return srv, ts.URL, signAny(t, jwt, "acct", auth.RoleOwner)
}

func TestAdminObservabilityLogs_NewestFirstWithFields(t *testing.T) {
	t.Parallel()
	_, base, tok := logsServer(t)

	resp, body := doReq(t, http.MethodGet, base+"/api/v1/admin/observability/logs", nil, tok)
	if resp.StatusCode != http.StatusOK {
		t.Fatalf("status = %d, want 200 (body=%s)", resp.StatusCode, body)
	}
	var env logEnvelope
	if err := json.Unmarshal(body, &env); err != nil {
		t.Fatalf("decode: %v (body=%s)", err, body)
	}
	want := []AdminLogEntry{
		{Level: "error", Source: "runtime/loop", Msg: "loop crashed"},
		{Level: "warn", Source: "gateway", Msg: "slow request"},
		{Level: "info", Source: "", Msg: "boot ok"},
	}
	if len(env.Data) != len(want) {
		t.Fatalf("got %d entries, want %d (%+v)", len(env.Data), len(want), env.Data)
	}
	for i, w := range want {
		got := env.Data[i]
		if got.Level != w.Level || got.Source != w.Source || got.Msg != w.Msg {
			t.Fatalf("data[%d] = %+v, want level=%s source=%q msg=%q", i, got, w.Level, w.Source, w.Msg)
		}
		if _, err := time.Parse(time.RFC3339, got.Time); err != nil {
			t.Fatalf("data[%d].Time = %q, want RFC3339: %v", i, got.Time, err)
		}
	}
}

func TestAdminObservabilityLogs_LevelFilter(t *testing.T) {
	t.Parallel()
	_, base, tok := logsServer(t)

	cases := []struct {
		level string
		want  []string
	}{
		{"debug", []string{"error", "warn", "info"}},
		{"info", []string{"error", "warn", "info"}},
		{"warn", []string{"error", "warn"}},
		{"error", []string{"error"}},
		{"ERROR", []string{"error"}}, // 大小写不敏感
		{"", []string{"error", "warn", "info"}},
	}
	for _, tc := range cases {
		tc := tc
		t.Run(tc.level, func(t *testing.T) {
			t.Parallel()
			resp, body := doReq(t, http.MethodGet, base+"/api/v1/admin/observability/logs?level="+tc.level, nil, tok)
			if resp.StatusCode != http.StatusOK {
				t.Fatalf("status = %d, want 200 (body=%s)", resp.StatusCode, body)
			}
			var env logEnvelope
			if err := json.Unmarshal(body, &env); err != nil {
				t.Fatalf("decode: %v (body=%s)", err, body)
			}
			if len(env.Data) != len(tc.want) {
				t.Fatalf("level=%q got %d entries, want %d (%+v)", tc.level, len(env.Data), len(tc.want), env.Data)
			}
			for i, lvl := range tc.want {
				if env.Data[i].Level != lvl {
					t.Fatalf("level=%q data[%d].Level = %q, want %q", tc.level, i, env.Data[i].Level, lvl)
				}
			}
		})
	}
}

func TestAdminObservabilityLogs_UnknownLevelIs400(t *testing.T) {
	t.Parallel()
	_, base, tok := logsServer(t)

	for _, bad := range []string{"trace", "warning", "verbose"} {
		resp, body := doReq(t, http.MethodGet, base+"/api/v1/admin/observability/logs?level="+bad, nil, tok)
		if resp.StatusCode != http.StatusBadRequest {
			t.Fatalf("level=%q status = %d, want 400 (body=%s)", bad, resp.StatusCode, body)
		}
		wantErrorShape(t, body)
		if !strings.Contains(string(body), "invalid_level") {
			t.Fatalf("level=%q body = %s, want invalid_level code", bad, body)
		}
	}
}

func TestAdminObservabilityLogs_LimitClamped(t *testing.T) {
	t.Parallel()
	_, base, tok := logsServer(t)

	resp, body := doReq(t, http.MethodGet, base+"/api/v1/admin/observability/logs?limit=2", nil, tok)
	if resp.StatusCode != http.StatusOK {
		t.Fatalf("status = %d, want 200 (body=%s)", resp.StatusCode, body)
	}
	var env logEnvelope
	if err := json.Unmarshal(body, &env); err != nil {
		t.Fatalf("decode: %v", err)
	}
	if len(env.Data) != 2 || env.Data[0].Msg != "loop crashed" || env.Data[1].Msg != "slow request" {
		t.Fatalf("limit=2 data = %+v, want the two newest", env.Data)
	}

	// 非法/缺失的 limit 回退到默认值（这里全部 3 条 < 200）。
	resp, body = doReq(t, http.MethodGet, base+"/api/v1/admin/observability/logs?limit=abc", nil, tok)
	if resp.StatusCode != http.StatusOK {
		t.Fatalf("bad limit status = %d, want 200 (body=%s)", resp.StatusCode, body)
	}
	var env2 logEnvelope
	if err := json.Unmarshal(body, &env2); err != nil {
		t.Fatalf("decode: %v", err)
	}
	if len(env2.Data) != 3 {
		t.Fatalf("bad limit returned %d entries, want the default (3)", len(env2.Data))
	}
}

func TestParseLogLimit_ClampBounds(t *testing.T) {
	t.Parallel()

	mk := func(raw string) int {
		r, err := http.NewRequest(http.MethodGet, "/?limit="+raw, nil)
		if err != nil {
			t.Fatalf("new request: %v", err)
		}
		return parseLogLimit(r)
	}
	if got := mk("99999"); got != maxLogLimit {
		t.Fatalf("parseLogLimit(99999) = %d, want max %d", got, maxLogLimit)
	}
	if got := mk("0"); got != defaultLogLimit {
		t.Fatalf("parseLogLimit(0) = %d, want default %d", got, defaultLogLimit)
	}
	if got := mk(""); got != defaultLogLimit {
		t.Fatalf("parseLogLimit(empty) = %d, want default %d", got, defaultLogLimit)
	}
	if got := mk("7"); got != 7 {
		t.Fatalf("parseLogLimit(7) = %d, want 7", got)
	}
}

func TestAdminObservabilityLogs_NoBufferIs501(t *testing.T) {
	t.Parallel()
	_, ts, jwt := buildEnv(t, cfgDefault(), Deps{})
	tok := signAny(t, jwt, "acct", auth.RoleOwner)

	resp, body := doReq(t, http.MethodGet, ts.URL+"/api/v1/admin/observability/logs", nil, tok)
	if resp.StatusCode != http.StatusNotImplemented {
		t.Fatalf("status = %d, want 501 (body=%s)", resp.StatusCode, body)
	}
	wantErrorShape(t, body)
	if !strings.Contains(string(body), "not_implemented") {
		t.Fatalf("body = %s, want not_implemented code", body)
	}
}

func TestAdminObservabilityLogs_EmptyBufferIs200Empty(t *testing.T) {
	t.Parallel()
	srv, ts, jwt := buildEnv(t, cfgDefault(), Deps{})
	srv.SetLogBuffer(logger.NewRingBuffer(4))
	tok := signAny(t, jwt, "acct", auth.RoleOwner)

	resp, body := doReq(t, http.MethodGet, ts.URL+"/api/v1/admin/observability/logs", nil, tok)
	if resp.StatusCode != http.StatusOK {
		t.Fatalf("status = %d, want 200 (body=%s)", resp.StatusCode, body)
	}
	if !strings.Contains(string(body), `"data":[]`) {
		t.Fatalf("body = %s, want an empty data list", body)
	}
}

// TestAdminObservabilityLogs_ViewerReadsTail 锁定 viewer 门：日志尾部
// 属于 viewer 角色存在的那个只读监控表面，因此
// viewer 读它就像 owner 一样（载荷是日志记录，不是
// 凭据）。
func TestAdminObservabilityLogs_ViewerReadsTail(t *testing.T) {
	t.Parallel()
	srv, ts, jwt := buildEnv(t, cfgDefault(), Deps{})
	srv.SetLogBuffer(logger.NewRingBuffer(4))
	tok := signAny(t, jwt, "acct", auth.RoleViewer)

	resp, body := doReq(t, http.MethodGet, ts.URL+"/api/v1/admin/observability/logs", nil, tok)
	if resp.StatusCode != http.StatusOK {
		t.Fatalf("viewer status = %d, want 200 (body=%s)", resp.StatusCode, body)
	}
	if !strings.Contains(string(body), `"data":[]`) {
		t.Fatalf("body = %s, want an empty data list", body)
	}
}