package gateway

import (
	"encoding/json"
	"sort"
	"strings"
	"testing"

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

// 本文件是历史 DTO 的 document 对象与持久化取值的测试（design/24 §2.4、§6.1）：
// 引用与统计往返、**不回传抽取正文**、坏列可见，以及 session_persist 的
// messageTextImageDocument 取值。

// TestHistoryMessageDocumentsCarryReferenceOnly 验证 documents 数组的元素只带
// 引用与统计：字段集被逐个钉住，将来谁往 DocumentRef 里加一个正文/摘要字段，
// 这里就会红。
func TestHistoryMessageDocumentsCarryReferenceOnly(t *testing.T) {
	t.Parallel()
	raw, err := history.EncodeDocuments([]history.DocumentRef{{
		Name:      "0123456789abcdef0123456789abcdef.txt",
		MIME:      "text/plain",
		Size:      12345,
		Chars:     8000,
		Truncated: true,
		Status:    history.DocumentStatusExtracted,
	}})
	if err != nil {
		t.Fatalf("encode: %v", err)
	}
	wire := toHistoryMessage(history.Message{ID: "m1", SessionID: "web", Role: "user", Content: "总结这份报告", Document: raw})
	b, err := json.Marshal(wire)
	if err != nil {
		t.Fatalf("marshal: %v", err)
	}

	var decoded map[string]any
	if err := json.Unmarshal(b, &decoded); err != nil {
		t.Fatalf("unmarshal: %v", err)
	}
	docs, ok := decoded["documents"].([]any)
	if !ok || len(docs) != 1 {
		t.Fatalf("documents array missing in %s", b)
	}
	doc, ok := docs[0].(map[string]any)
	if !ok {
		t.Fatalf("documents[0] is not an object in %s", b)
	}
	keys := make([]string, 0, len(doc))
	for k := range doc {
		keys = append(keys, k)
	}
	sort.Strings(keys)
	if got := strings.Join(keys, ","); got != "chars,mime,name,size,status,truncated" {
		t.Fatalf("documents[0] keys = %q, want chars,mime,name,size,status,truncated", got)
	}
	if doc["name"] != "0123456789abcdef0123456789abcdef.txt" || doc["status"] != history.DocumentStatusExtracted {
		t.Fatalf("documents[0] = %v, want the persisted reference", doc)
	}
}

// TestHistoryMessageDocumentsAbsentWhenNoColumn 验证没有附件的消息省略该字段：
// 空列与「带附件」必须可区分（省略 = 没有附件）。
func TestHistoryMessageDocumentsAbsentWhenNoColumn(t *testing.T) {
	t.Parallel()
	wire := toHistoryMessage(history.Message{ID: "m1", Role: "user", Content: "没有附件"})
	b, err := json.Marshal(wire)
	if err != nil {
		t.Fatalf("marshal: %v", err)
	}
	if strings.Contains(string(b), `"documents"`) {
		t.Fatalf("empty column should omit documents, got %s", b)
	}
}

// TestHistoryMessageDocumentsMultipleKeepOrder 验证一回合多个附件原样回传
// （缺口①）：数组长度与顺序都一致，客户端因此不会只看到第一个附件。
func TestHistoryMessageDocumentsMultipleKeepOrder(t *testing.T) {
	t.Parallel()
	raw, err := history.EncodeDocuments([]history.DocumentRef{
		{Name: "aaa.txt", MIME: "text/plain", Size: 1},
		{Name: "bbb.pdf", MIME: "application/pdf", Size: 2, Status: history.DocumentStatusUnreadable},
		{Name: "ccc.csv", MIME: "text/csv", Size: 3, Chars: 9, Status: history.DocumentStatusExtracted},
	})
	if err != nil {
		t.Fatalf("encode: %v", err)
	}
	wire := toHistoryMessage(history.Message{ID: "m1", Role: "user", Content: "三个附件", Document: raw})
	if len(wire.Documents) != 3 {
		t.Fatalf("Documents = %+v, want 3 条", wire.Documents)
	}
	for i, want := range []string{"aaa.txt", "bbb.pdf", "ccc.csv"} {
		if wire.Documents[i].Name != want {
			t.Fatalf("Documents[%d].Name = %q, want %q（顺序必须与发送一致）", i, wire.Documents[i].Name, want)
		}
	}
}

// TestHistoryMessageDocumentsMalformedColumnIsVisible 验证列里是坏内容时
// 不静默当成「没有附件」：回一条标着 status=unreadable 的最小引用，让客户端
// 看得见这条引用读不出来（design/24 §4.4 的「失败必须可见」）。
func TestHistoryMessageDocumentsMalformedColumnIsVisible(t *testing.T) {
	t.Parallel()
	wire := toHistoryMessage(history.Message{ID: "m1", Role: "user", Content: "带附件", Document: "{not json"})
	if len(wire.Documents) != 1 {
		t.Fatalf("Documents = %+v, want 一条 unreadable 的最小引用", wire.Documents)
	}
	if wire.Documents[0].Status != history.DocumentStatusUnreadable {
		t.Fatalf("status = %q, want %q", wire.Documents[0].Status, history.DocumentStatusUnreadable)
	}
}

// TestMessageTextImageDocument 验证持久化取值：文本、首个图片 URL 与首个文档
// 引用各归各列，且文档列是引用（JSON 小对象）而不是正文。
func TestMessageTextImageDocument(t *testing.T) {
	t.Parallel()
	doc := model.Document{Name: "aaaabbbbccccdddd.txt", MIME: "text/plain", URL: "/api/v1/documents/aaaabbbbccccdddd.txt", Size: 1234}
	m := model.DocumentMessage(model.RoleUser, "读一下", doc)
	m.Content = append(m.Content, model.Content{Type: model.ContentTypeImage, ImageURL: "data:image/png;base64,abc"})

	text, image, raw, err := messageTextImageDocument(m)
	if err != nil {
		t.Fatalf("messageTextImageDocument: %v", err)
	}
	if text != "读一下" {
		t.Fatalf("text = %q, want 读一下", text)
	}
	if image != "data:image/png;base64,abc" {
		t.Fatalf("image = %q", image)
	}
	refs, err := history.DecodeDocuments(raw)
	if err != nil {
		t.Fatalf("decode documents: %v", err)
	}
	if len(refs) != 1 || refs[0].Name != doc.Name || refs[0].MIME != doc.MIME || refs[0].Size != doc.Size {
		t.Fatalf("refs = %+v, want name/mime/size of %+v", refs, doc)
	}
}

// TestMessageTextImageDocumentWithoutDocument 验证没有文档部件时文档列为空
// （而不是 "[]"/"{}"）：拼一个空形状会让读取侧把它当成一条读不出来的附件。
func TestMessageTextImageDocumentWithoutDocument(t *testing.T) {
	t.Parallel()
	_, _, raw, err := messageTextImageDocument(model.TextMessage(model.RoleUser, "只有文本"))
	if err != nil {
		t.Fatalf("messageTextImageDocument: %v", err)
	}
	if raw != "" {
		t.Fatalf("document = %q, want empty", raw)
	}
}