package gateway

import (
	"context"
	"net/http"
	"testing"

	"git.yeij.top/AskaEth/Cyrene_v2/internal/auth"
	"git.yeij.top/AskaEth/Cyrene_v2/internal/runtime/history"
)

// TestHistoryListMessagesAfterCursor 覆盖前向游标（A5）：after 返回
// 严格更新的消息且最旧优先，before 保持既有的最新优先行为，
// 两个游标互斥。
func TestHistoryListMessagesAfterCursor(t *testing.T) {
	t.Parallel()
	_, ts, jwt, st := newHistoryEnv(t)
	ctx := context.Background()
	for _, ms := range []int64{1000, 2000, 3000, 4000} {
		if err := st.Append(ctx, history.Message{SessionID: history.MainSessionID, Role: history.RoleUser, Content: "x", CreatedAt: ms}); err != nil {
			t.Fatalf("seed %d: %v", ms, err)
		}
	}
	tok := signAny(t, jwt, "acct", auth.RoleOwner)
	base := ts.URL + "/api/v1/sessions/" + history.MainSessionID + "/messages"

	// after=2000 → 严格更新，最旧优先。
	resp, body := doReq(t, http.MethodGet, base+"?after=2000", nil, tok)
	if resp.StatusCode != http.StatusOK {
		t.Fatalf("after status = %d, want 200 (body=%s)", resp.StatusCode, body)
	}
	var forward []historyMessage
	decodeDataSlice(t, body, &forward)
	if len(forward) != 2 || forward[0].CreatedAt != 3000 || forward[1].CreatedAt != 4000 {
		t.Fatalf("after=2000 = %+v, want ascending [3000 4000]", forward)
	}

	// after 设为最新消息 → 空页，仍为 200。
	resp, body = doReq(t, http.MethodGet, base+"?after=4000", nil, tok)
	if resp.StatusCode != http.StatusOK {
		t.Fatalf("after newest status = %d, want 200 (body=%s)", resp.StatusCode, body)
	}
	var empty []historyMessage
	decodeDataSlice(t, body, &empty)
	if len(empty) != 0 {
		t.Fatalf("after=4000 = %+v, want empty", empty)
	}

	// before 行为不变：最新优先，严格更旧。
	resp, body = doReq(t, http.MethodGet, base+"?before=3000&limit=2", nil, tok)
	if resp.StatusCode != http.StatusOK {
		t.Fatalf("before status = %d, want 200 (body=%s)", resp.StatusCode, body)
	}
	var backward []historyMessage
	decodeDataSlice(t, body, &backward)
	if len(backward) != 2 || backward[0].CreatedAt != 2000 || backward[1].CreatedAt != 1000 {
		t.Fatalf("before=3000 = %+v, want descending [2000 1000]", backward)
	}

	// after=0 不是前向边界 → 回退到默认的最新优先页。
	resp, body = doReq(t, http.MethodGet, base+"?after=0&limit=2", nil, tok)
	if resp.StatusCode != http.StatusOK {
		t.Fatalf("after=0 status = %d, want 200 (body=%s)", resp.StatusCode, body)
	}
	var zero []historyMessage
	decodeDataSlice(t, body, &zero)
	if len(zero) != 2 || zero[0].CreatedAt != 4000 || zero[1].CreatedAt != 3000 {
		t.Fatalf("after=0 = %+v, want default descending [4000 3000]", zero)
	}
}

// TestHistoryListMessagesAfterRejectsBadInput 覆盖那些 400：两个游标同时
// 给出，以及 after 为负或非数字。
func TestHistoryListMessagesAfterRejectsBadInput(t *testing.T) {
	t.Parallel()
	_, ts, jwt, _ := newHistoryEnv(t)
	tok := signAny(t, jwt, "acct", auth.RoleOwner)
	base := ts.URL + "/api/v1/sessions/" + history.MainSessionID + "/messages"

	for _, q := range []string{
		"?after=1000&before=3000", // 两个游标都给
		"?after=-1",               // 负数
		"?after=abc",              // 非数字
	} {
		resp, body := doReq(t, http.MethodGet, base+q, nil, tok)
		if resp.StatusCode != http.StatusBadRequest {
			t.Fatalf("query %s status = %d, want 400 (body=%s)", q, resp.StatusCode, body)
		}
	}
}

// TestHistoryListMessagesAfterPlatformFilter 断言平台过滤与前向游标
// 可以组合。
func TestHistoryListMessagesAfterPlatformFilter(t *testing.T) {
	t.Parallel()
	_, ts, jwt, st := newHistoryEnv(t)
	ctx := context.Background()
	seeds := []history.Message{
		{SessionID: history.MainSessionID, Role: history.RoleUser, Content: "web", Platform: history.PlatformWeb, CreatedAt: 1000},
		{SessionID: history.MainSessionID, Role: history.RoleUser, Content: "tg1", Platform: "telegram", CreatedAt: 2000},
		{SessionID: history.MainSessionID, Role: history.RoleUser, Content: "tg2", Platform: "telegram", CreatedAt: 3000},
	}
	for _, m := range seeds {
		if err := st.Append(ctx, m); err != nil {
			t.Fatalf("seed %s: %v", m.Content, err)
		}
	}
	tok := signAny(t, jwt, "acct", auth.RoleOwner)

	resp, body := doReq(t, http.MethodGet,
		ts.URL+"/api/v1/sessions/"+history.MainSessionID+"/messages?after=1000&platform=telegram", nil, tok)
	if resp.StatusCode != http.StatusOK {
		t.Fatalf("after+platform status = %d, want 200 (body=%s)", resp.StatusCode, body)
	}
	var tg []historyMessage
	decodeDataSlice(t, body, &tg)
	if len(tg) != 2 || tg[0].Content != "tg1" || tg[1].Content != "tg2" {
		t.Fatalf("after=1000&platform=telegram = %+v, want [tg1 tg2]", tg)
	}
}

// TestHistoryListMessagesAfterLimitClamp 断言前向页与后向一样上限 200，
// 且推进返回的游标能无缝隙地向前翻页。
func TestHistoryListMessagesAfterLimitClamp(t *testing.T) {
	t.Parallel()
	_, ts, jwt, st := newHistoryEnv(t)
	ctx := context.Background()
	const total = 205
	for i := 0; i < total; i++ {
		tsMs := int64(1000 + i)
		if err := st.Append(ctx, history.Message{SessionID: history.MainSessionID, Role: history.RoleUser, Content: "m", CreatedAt: tsMs}); err != nil {
			t.Fatalf("seed %d: %v", tsMs, err)
		}
	}
	tok := signAny(t, jwt, "acct", auth.RoleOwner)
	base := ts.URL + "/api/v1/sessions/" + history.MainSessionID + "/messages"

	resp, body := doReq(t, http.MethodGet, base+"?after=999&limit=999", nil, tok)
	if resp.StatusCode != http.StatusOK {
		t.Fatalf("clamp status = %d, want 200 (body=%s)", resp.StatusCode, body)
	}
	var page []historyMessage
	decodeDataSlice(t, body, &page)
	if len(page) != 200 {
		t.Fatalf("clamped page len = %d, want 200", len(page))
	}
	if page[0].CreatedAt != 1000 || page[len(page)-1].CreatedAt != 1199 {
		t.Fatalf("clamped page bounds = [%d..%d], want [1000..1199]", page[0].CreatedAt, page[len(page)-1].CreatedAt)
	}

	resp, body = doReq(t, http.MethodGet, base+"?after=1199", nil, tok)
	if resp.StatusCode != http.StatusOK {
		t.Fatalf("next page status = %d, want 200 (body=%s)", resp.StatusCode, body)
	}
	var next []historyMessage
	decodeDataSlice(t, body, &next)
	if len(next) != total-200 || next[0].CreatedAt != 1200 {
		t.Fatalf("next page = len %d first %d, want len 5 first 1200", len(next), next[0].CreatedAt)
	}
}