package schema

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

func codeOf(err error) string {
	var e *Error
	if errors.As(err, &e) {
		return e.Code
	}
	return ""
}

// TestDecodeCustom pins the C17 caps: an object or a non-empty list of
// objects, 16 KB, 8 levels, no <script in any case or spacing, the
// parser's line and column for invalid JSON, nothing after the value, and
// @context dropped.
func TestDecodeCustom(t *testing.T) {
	nodes, err := DecodeCustom(` {"@context":"https://schema.org","@type":"FAQPage","n":1.50} `)
	if err != nil || len(nodes) != 1 || nodes[0]["@context"] != nil || nodes[0]["n"].(json.Number).String() != "1.50" {
		t.Fatalf("object = %v err=%v", nodes, err)
	}
	if nodes, err := DecodeCustom(`[{"@type":"A"},{"@type":"B"}]`); err != nil || len(nodes) != 2 {
		t.Fatalf("list = %v err=%v", nodes, err)
	}
	if nodes, err := DecodeCustom("  "); err != nil || nodes != nil {
		t.Fatalf("blank = %v err=%v", nodes, err)
	}
	deep := strings.Repeat(`{"a":`, 8) + "1" + strings.Repeat("}", 8)
	if _, err := DecodeCustom(deep); err != nil {
		t.Fatalf("8 levels must pass: %v", err)
	}
	for name, tc := range map[string]struct{ text, code string }{
		"too large":   {`{"a":"` + strings.Repeat("x", MaxCustomBytes) + `"}`, CodeTooLarge},
		"too deep":    {strings.Repeat(`{"a":`, 9) + "1" + strings.Repeat("}", 9), CodeTooDeep},
		"script":      {`{"a":"</script><script>x"}`, CodeScriptTag},
		"script case": {`{"a":"< SCRIPT src=x>"}`, CodeScriptTag},
		"string":      {`"x"`, CodeNotObject},
		"number":      {`5`, CodeNotObject},
		"empty list":  {`[]`, CodeNotObject},
		"mixed list":  {`[{"a":1},2]`, CodeNotObject},
		"syntax":      {"{\n  \"a\": 1,\n  \"b\" 2\n}", CodeInvalidJSON},
		"truncated":   {`{"a":`, CodeInvalidJSON},
		"trailing":    {`{"a":1} {"b":2}`, CodeInvalidJSON},
	} {
		if _, err := DecodeCustom(tc.text); codeOf(err) != tc.code {
			t.Errorf("%s: err %v, want code %s", name, err, tc.code)
		}
	}
	_, err = DecodeCustom("{\n  \"a\": 1,\n  \"b\" 2\n}")
	if e := err.(*Error); !strings.HasPrefix(e.Detail, "line 3, column ") {
		t.Fatalf("syntax detail = %q, want line 3", e.Detail)
	}
	if _, err := DecodeCustom(`{"a":`); !strings.Contains(err.Error(), "unexpected end of JSON input") {
		t.Fatalf("truncated = %v", err)
	}
}

// TestNormalize pins the stored form of the seo_schema value: the type
// checked against the kind, Service fields only for Service (price and
// currency normalised and checked), custom JSON-LD re-serialised, and the
// empty value stored as "".
func TestNormalize(t *testing.T) {
	stored, v, err := Normalize(KindPage, VariantOffer, `{"type":"","fields":{"price":" 149,99 ","currency":"pln","areaServed":" Kraków "},"custom":"{\"@type\":\"FAQPage\"}"}`)
	if err != nil || v.Fields.Price != "149.99" || v.Fields.Currency != "PLN" || v.Fields.AreaServed != "Kraków" || !strings.Contains(v.Custom, "\n  \"@type\": \"FAQPage\"\n") {
		t.Fatalf("service value = %+v err=%v", v, err)
	}
	var back Value
	if json.Unmarshal([]byte(stored), &back) != nil || back != v {
		t.Fatalf("stored = %s, want the normalised value", stored)
	}
	if _, v, _ := Normalize(KindArticle, "", `{"type":"Article","fields":{"price":"5"}}`); v.Fields != (ServiceFields{}) || v.Type != TypeArticle {
		t.Fatalf("an article keeps no Service fields: %+v", v)
	}
	if stored, _, err := Normalize(KindPage, "", `{"type":" ","fields":{"price":"5"}}`); err != nil || stored != "" {
		t.Fatalf("empty value = %q err=%v", stored, err)
	}
	if stored, _, err := Normalize(KindPage, "", ""); err != nil || stored != "" {
		t.Fatalf("blank = %q err=%v", stored, err)
	}
	if s, _, _ := Normalize(KindPage, "", `{"custom":"[{\"@type\":\"A\"},{\"@type\":\"B\"}]"}`); !strings.Contains(s, `[\n  {`) {
		t.Fatalf("a list stays a list: %s", s)
	}
	for name, tc := range map[string]struct{ kind, variant, raw, code, field string }{
		"type":     {KindPage, "", `{"type":"BlogPosting"}`, CodeTypeUnknown, ""},
		"price":    {KindPage, VariantService, `{"fields":{"price":"abc"}}`, CodeFieldInvalid, "price"},
		"currency": {KindPage, VariantService, `{"fields":{"currency":"zloty"}}`, CodeFieldInvalid, "currency"},
		"json":     {KindPage, "", `{"type":`, CodeInvalidJSON, ""},
		"custom":   {KindPage, "", `{"custom":"<script>"}`, CodeScriptTag, ""},
	} {
		_, _, err := Normalize(tc.kind, tc.variant, tc.raw)
		var e *Error
		if !errors.As(err, &e) || e.Code != tc.code || e.Field != tc.field {
			t.Errorf("%s: err %v, want %s %s", name, err, tc.code, tc.field)
		}
	}
}

// TestMerge pins the merge of custom nodes: a node with a generated @id is
// merged into it (custom values win, the replaced properties reported
// sorted), a node without @id or with a new @id is appended, and an equal
// value is not reported.
func TestMerge(t *testing.T) {
	g := map[string]any{"@context": Context, "@graph": []any{
		map[string]any{"@type": TypeWebPage, "@id": "p#webpage", "name": "Old", "url": "u"},
		map[string]any{"@type": TypeWebSite, "@id": "s#website", "name": "Site"},
	}}
	out, merged := Merge(g, []map[string]any{
		{"@id": "p#webpage", "name": "New", "url": "u", "about": "x", "description": "d"},
		{"@type": "FAQPage"},
		{"@id": "p#faq", "@type": "FAQPage"},
		{"@id": "s#website", "name": "Site"},
	})
	nodes := Nodes(out)
	if len(nodes) != 4 || nodes[0]["name"] != "New" || nodes[0]["description"] != "d" || nodes[2]["@type"] != "FAQPage" || nodes[3]["@id"] != "p#faq" {
		t.Fatalf("merged graph = %v", nodes)
	}
	if len(merged) != 1 || merged[0].ID != "p#webpage" || merged[0].Type != TypeWebPage || strings.Join(merged[0].Props, ",") != "name" {
		t.Fatalf("merges = %+v", merged)
	}
	if out["@context"] != Context {
		t.Fatal("the merged graph keeps its context")
	}
	_, none := Merge(g, nil)
	if none != nil {
		t.Fatalf("no custom nodes reported %v", none)
	}
}

// TestParseValue pins the stored value's reading.
func TestParseValue(t *testing.T) {
	if v, err := ParseValue(""); err != nil || v != (Value{}) {
		t.Fatal("blank is the zero value")
	}
	if _, err := ParseValue("{"); codeOf(err) != CodeInvalidJSON {
		t.Fatalf("invalid = %v", err)
	}
	if v, _ := ParseValue(`{"type":"Article","custom":"{}"}`); v.Type != "Article" || v.Custom != "{}" {
		t.Fatalf("value = %+v", v)
	}
	if (&Error{Code: "x"}).Error() != "schema: x" || (&Error{Code: "x", Detail: "d"}).Error() != "schema: x: d" {
		t.Fatal("Error() is wrong")
	}
}