package kit

import (
	"encoding/json"
	"strings"
	"testing"
	"time"
	"unicode/utf8"

	"github.com/mark3labs/mcp-go/mcp"
)

func textOf(t *testing.T, r *mcp.CallToolResult) string {
	t.Helper()
	if len(r.Content) == 0 {
		t.Fatal("结果没有内容")
	}
	tc, ok := r.Content[0].(mcp.TextContent)
	if !ok {
		t.Fatalf("第一段内容不是文本: %T", r.Content[0])
	}
	return tc.Text
}

type row struct {
	SN    string  `json:"sn"`
	Phone string  `json:"phone"`
	Note  string  `json:"note"`
	Empty *string `json:"empty"`
}

func TestListLimitAndTruncation(t *testing.T) {
	rows := make([]row, 300)
	for i := range rows {
		rows[i] = row{SN: "1006", Phone: "13800000000", Note: strings.Repeat("x", 50)}
	}
	r := List(rows, -1, 100, "")
	var got ListResult
	if err := json.Unmarshal([]byte(textOf(t, r)), &got); err != nil {
		t.Fatal(err)
	}
	if got.Total != 300 || got.Returned != 100 || !got.Truncated || got.Hint == "" {
		t.Errorf("limit 截断不正确: total=%d returned=%d truncated=%v", got.Total, got.Returned, got.Truncated)
	}
	item := got.Items[0].(map[string]any)
	if item["phone"] == "13800000000" {
		t.Error("phone 应被脱敏")
	}
	if _, ok := item["empty"]; ok {
		t.Error("null 字段应被去掉")
	}
}

func TestListCharCap(t *testing.T) {
	rows := make([]row, 500)
	for i := range rows {
		rows[i] = row{SN: "1006", Note: strings.Repeat("长", 200)}
	}
	text := textOf(t, List(rows, -1, 500, ""))
	if utf8.RuneCountInString(text) > MaxResultChars {
		t.Errorf("结果 %d 字符，超过上限 %d", utf8.RuneCountInString(text), MaxResultChars)
	}
	var got ListResult
	_ = json.Unmarshal([]byte(text), &got)
	if !got.Truncated || got.Returned >= 500 {
		t.Errorf("应因字符上限截断: returned=%d", got.Returned)
	}
}

func TestListEmpty(t *testing.T) {
	r := List([]row{}, -1, 10, "")
	if r.IsError || !strings.Contains(textOf(t, r), "没有") {
		t.Error("空列表应返回无数据提示")
	}
}

func TestTableCharCap(t *testing.T) {
	cols := []string{"time", "value"}
	rows := make([][]string, 5000)
	for i := range rows {
		rows[i] = []string{"2026-10-01 00:00:00", strings.Repeat("9", 20)}
	}
	text := textOf(t, Table(cols, rows, 0, ""))
	if utf8.RuneCountInString(text) > MaxResultChars {
		t.Errorf("表格 %d 字符，超过上限", utf8.RuneCountInString(text))
	}
	if !strings.Contains(text, "truncated=true") {
		t.Error("表格应标注 truncated=true")
	}
}

func TestTableMasksByColumn(t *testing.T) {
	text := textOf(t, Table([]string{"sn", "email"}, [][]string{{"1006", "alice@example.com"}}, 0, ""))
	if strings.Contains(text, "alice@") {
		t.Errorf("email 列应脱敏: %s", text)
	}
}

func TestExportResource(t *testing.T) {
	r := Export("fwh://export/test.csv", []string{"a", "b"}, [][]string{{"1", "2"}, {"3", "4"}}, "测试")
	if len(r.Content) != 2 {
		t.Fatalf("导出应含文本摘要与资源两段内容，实际 %d", len(r.Content))
	}
	er, ok := r.Content[1].(mcp.EmbeddedResource)
	if !ok {
		t.Fatalf("第二段应为 EmbeddedResource: %T", r.Content[1])
	}
	tr := er.Resource.(mcp.TextResourceContents)
	if tr.MIMEType != "text/csv" || !strings.HasPrefix(tr.Text, "a,b\n1,2\n") {
		t.Errorf("CSV 内容不正确: %q", tr.Text)
	}
}

func TestObjectPrunesAndMasks(t *testing.T) {
	text := textOf(t, Object(map[string]any{"sn": "1006", "address": "1 Main St", "blank": "", "list": []any{}}))
	if strings.Contains(text, "Main St") || strings.Contains(text, "blank") || strings.Contains(text, "list") {
		t.Errorf("对象应脱敏并去掉空值: %s", text)
	}
}

func TestParseRange(t *testing.T) {
	if _, _, err := ParseRange("2026-10-01 00:00:00", "2026-10-01 00:00:00", 0); err == nil {
		t.Error("from == to 应报错")
	}
	if _, _, err := ParseRange("2026-10-01", "2026-12-01", 31*24*time.Hour); err == nil {
		t.Error("超过最大跨度应报错")
	}
	if _, _, err := ParseRange("2026-10-01", "2026-10-02 12:00:00", 31*24*time.Hour); err != nil {
		t.Errorf("合法范围不应报错: %v", err)
	}
}

func TestEnumAndLimit(t *testing.T) {
	if v, _ := Enum("k", "", "all", "all", "alarm"); v != "all" {
		t.Error("空值应取默认")
	}
	if v, _ := Enum("k", "ALARM", "all", "all", "alarm"); v != "alarm" {
		t.Error("应大小写不敏感")
	}
	if _, err := Enum("k", "x", "all", "all", "alarm"); err == nil {
		t.Error("非法值应报错")
	}
	if Limit(0, 10, 50) != 10 || Limit(99, 10, 50) != 50 || Limit(5, 10, 50) != 5 {
		t.Error("Limit 归一化不正确")
	}
}