package core

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

func validSpec() SurfaceSpec {
	return SurfaceSpec{
		Title: "三家候选工具选型对比",
		Nodes: []UINode{
			{Type: UISection, ID: "n1", Title: "一、概览", Children: []UINode{
				{Type: UIMarkdown, ID: "n1a", Source: []string{"doc:eval/rc-01/vendor1"}, Markdown: "本期评估三家候选。"},
			}},
			{Type: UITable, ID: "n2", Source: []string{"doc:eval/rc-01/vendor1", "doc:eval/rc-01/vendor2"}, Table: &UITableSpec{
				Columns: []UITableColumn{{Key: "k", Label: "维度"}, {Key: "v", Label: "值"}},
				Rows:    []UITableRow{{ID: "r1", Cells: [][2]string{{"k", "价格"}, {"v", "¥8/人/天"}}}},
			}},
			{Type: UISteps, ID: "n3", Steps: &UIStepsSpec{Current: 1, Steps: []UIStep{
				{Label: "需求冻结", Status: "done"}, {Label: "契约定义", Status: "active"},
			}}},
			{Type: UIForm, ID: "n4", Fields: []UIField{
				{Key: "years", Label: "归档年限", Type: "select", Options: []string{"3", "5"}, Required: true},
			}},
		},
	}
}

func TestValidateSurfaceSpecValid(t *testing.T) {
	if errs := ValidateSurfaceSpec(validSpec(), nil); len(errs) != 0 {
		t.Fatalf("合法规格不应有违规: %v", errs)
	}
	// JSON 往返后仍合法（信封序列化面）。
	b, err := json.Marshal(validSpec())
	if err != nil {
		t.Fatal(err)
	}
	var back SurfaceSpec
	if err := json.Unmarshal(b, &back); err != nil {
		t.Fatal(err)
	}
	if errs := ValidateSurfaceSpec(back, nil); len(errs) != 0 {
		t.Fatalf("JSON 往返后不应有违规: %v", errs)
	}
}

func TestValidateSurfaceSpecViolations(t *testing.T) {
	cases := []struct {
		name string
		mut  func(*SurfaceSpec)
		want string
	}{
		{"未知类型", func(s *SurfaceSpec) { s.Nodes[0].Type = " hologram" }, "未知节点类型"},
		{"重复节点 id", func(s *SurfaceSpec) { s.Nodes[1].ID = "n1" }, "重复节点 id"},
		{"表格行列不齐", func(s *SurfaceSpec) {
			s.Nodes[1].Table.Rows = []UITableRow{{Cells: [][2]string{{"k", "只有一列"}}}}
		}, "不等长"},
		{"select 缺 options", func(s *SurfaceSpec) {
			s.Nodes[3].Fields[0].Options = nil
		}, "缺 options"},
		{"steps 越界", func(s *SurfaceSpec) { s.Nodes[2].Steps.Current = 5 }, "current 在范围内"},
		{"空 title", func(s *SurfaceSpec) { s.Title = "" }, "title 必填"},
		{"空 nodes", func(s *SurfaceSpec) { s.Nodes = nil }, "nodes 需非空"},
		{"markdown 空", func(s *SurfaceSpec) {
			s.Nodes[0].Children[0].Markdown = ""
		}, "markdown 需要正文"},
		{"progress 越界", func(s *SurfaceSpec) {
			s.Nodes = append(s.Nodes, UINode{Type: UIProgress, Progress: &UIProgressSpec{Value: 1.5}})
		}, "progress.value"},
		{"未知来源", func(s *SurfaceSpec) {}, ""},
	}
	for _, c := range cases {
		s := validSpec()
		c.mut(&s)
		errs := ValidateSurfaceSpec(s, nil)
		if c.want == "" {
			continue
		}
		found := false
		for _, e := range errs {
			if strings.Contains(e, c.want) {
				found = true
				break
			}
		}
		if !found {
			t.Errorf("%s: 期望包含 %q，得到 %v", c.name, c.want, errs)
		}
	}
	// knownSources 非空时：未知来源拒绝、已知来源放行。
	s := validSpec()
	errs := ValidateSurfaceSpec(s, map[string]bool{"doc:eval/rc-01/vendor1": true, "doc:eval/rc-01/vendor2": true})
	if len(errs) != 0 {
		t.Fatalf("已知来源全引用不应违规: %v", errs)
	}
	s.Nodes[0].Children[0].Source = append(s.Nodes[0].Children[0].Source, "doc:eval/rc-99/ghost")
	errs = ValidateSurfaceSpec(s, map[string]bool{"doc:eval/rc-01/vendor1": true})
	if len(errs) == 0 {
		t.Fatal("引用未知来源应拒绝")
	}
}

func TestValidateSurfaceSpecLimits(t *testing.T) {
	deep := UINode{Type: UISection, ID: "d0"}
	cur := &deep
	for i := 1; i <= SurfaceMaxDepth+1; i++ {
		cur.Children = []UINode{{Type: UISection, ID: "d" + string(rune('0'+i%10))}}
		cur = &cur.Children[0]
	}
	if errs := ValidateSurfaceSpec(SurfaceSpec{Title: "t", Nodes: []UINode{deep}}, nil); len(errs) == 0 {
		t.Fatal("超过嵌套深度应拒绝")
	}
	many := make([]UINode, SurfaceMaxNodes+1)
	for i := range many {
		many[i] = UINode{Type: UIMarkdown, Markdown: "x"}
	}
	if errs := ValidateSurfaceSpec(SurfaceSpec{Title: "t", Nodes: many}, nil); len(errs) == 0 {
		t.Fatal("超过节点数应拒绝")
	}
}

func TestUINodeBackwardCompat(t *testing.T) {
	// 旧卡片路径的 UINode JSON（无 id/source）解出后字段为零值，不受影响。
	var n UINode
	if err := json.Unmarshal([]byte(`{"type":"list","items":["a"]}`), &n); err != nil {
		t.Fatal(err)
	}
	if n.ID != "" || n.Source != nil || n.Type != UIList || len(n.Items) != 1 {
		t.Fatalf("旧负载解引用异常: %+v", n)
	}
	// 新字段双向序列化。
	b, _ := json.Marshal(UINode{Type: UIMarkdown, ID: "m1", Source: []string{"s1"}, Markdown: "x"})
	if !strings.Contains(string(b), `"id":"m1"`) || !strings.Contains(string(b), `"source":["s1"]`) {
		t.Fatalf("新字段序列化缺失: %s", b)
	}
}