package mailx_test

import (
	"encoding/json"
	"testing"

	mailx "code.yun.ink/pkg/mailx"
)

func TestAddressHelpers(t *testing.T) {
	// 纯地址
	if !mailx.IsValidAddress("a@example.com") {
		t.Error("IsValidAddress(a@example.com) = false")
	}
	// 显示名
	if !mailx.IsValidAddress(`"张三" <a@example.com>`) {
		t.Error("IsValidAddress(with display name) = false")
	}
	// 非法
	if mailx.IsValidAddress("not-an-email") {
		t.Error("IsValidAddress(not-an-email) = true")
	}
	if mailx.IsValidAddress("") {
		t.Error("IsValidAddress(empty) = true")
	}

	// ExtractEmail 提取纯地址
	addr, err := mailx.ExtractEmail(`"张三" <a@example.com>`)
	if err != nil {
		t.Fatal(err)
	}
	if addr != "a@example.com" {
		t.Errorf("ExtractEmail = %q, want a@example.com", addr)
	}
	// ExtractEmail 纯地址原样返回
	addr, err = mailx.ExtractEmail("a@example.com")
	if err != nil || addr != "a@example.com" {
		t.Errorf("ExtractEmail(plain) = %q, %v", addr, err)
	}
}

func TestAddressList(t *testing.T) {
	addrs, err := mailx.AddressList(`"A" <a@e.com>, b@e.com; c@e.com`)
	if err != nil {
		t.Fatal(err)
	}
	if len(addrs) != 3 {
		t.Fatalf("AddressList len = %d, want 3", len(addrs))
	}
	if addrs[0].Address != "a@e.com" || addrs[1].Address != "b@e.com" || addrs[2].Address != "c@e.com" {
		t.Errorf("unexpected addresses: %+v", addrs)
	}
}

func TestFromBytes(t *testing.T) {
	m := mailx.NewMessage().
		From("a@e.com").
		To("b@e.com").
		Subject("s").
		Text("t").
		HTML("<p>h</p>").
		Build()

	data, err := json.Marshal(m)
	if err != nil {
		t.Fatal(err)
	}
	got, err := mailx.FromBytes(data)
	if err != nil {
		t.Fatal(err)
	}
	if got.From != "a@e.com" || got.Subject != "s" || got.Body != "<p>h</p>" {
		t.Errorf("FromBytes mismatch: %+v", got)
	}
}

func TestFromBytesInvalid(t *testing.T) {
	if _, err := mailx.FromBytes([]byte("not json")); err == nil {
		t.Fatal("FromBytes(invalid) should error")
	}
}

func TestFromMap(t *testing.T) {
	m := map[string]any{
		"from":    "a@e.com",
		"to":      "b@e.com, c@e.com",
		"cc":      []string{"d@e.com"},
		"subject": "hello",
		"text":    "plain",
		"html":    "<b>hi</b>",
		"replyto": "r@e.com",
	}
	msg, err := mailx.FromMap(m)
	if err != nil {
		t.Fatal(err)
	}
	if msg.From != "a@e.com" || msg.Subject != "hello" {
		t.Errorf("FromMap fields: %+v", msg)
	}
	if len(msg.To) != 2 || msg.To[0] != "b@e.com" || msg.To[1] != "c@e.com" {
		t.Errorf("FromMap To: %v", msg.To)
	}
	if len(msg.Cc) != 1 || msg.Cc[0] != "d@e.com" {
		t.Errorf("FromMap Cc: %v", msg.Cc)
	}
	if msg.TextBody != "plain" || msg.Body != "<b>hi</b>" {
		t.Errorf("FromMap bodies: text=%q html=%q", msg.TextBody, msg.Body)
	}
	if msg.ReplyTo != "r@e.com" {
		t.Errorf("FromMap ReplyTo: %q", msg.ReplyTo)
	}
}

func TestFromMapNil(t *testing.T) {
	if _, err := mailx.FromMap(nil); err == nil {
		t.Fatal("FromMap(nil) should error")
	}
}

func TestFromMapAttachments(t *testing.T) {
	m := map[string]any{
		"to": "a@e.com",
		"attachments": []any{
			map[string]any{"name": "x.txt", "path": "tmp/x.txt"},
		},
	}
	msg, err := mailx.FromMap(m)
	if err != nil {
		t.Fatal(err)
	}
	if len(msg.Attachments) != 1 || msg.Attachments[0].Name != "x.txt" {
		t.Errorf("FromMap attachments: %+v", msg.Attachments)
	}
}

// TestFromMapAttachmentNoName 验证附件 map 缺 name 键时不 panic，且 name 从 path 推导
func TestFromMapAttachmentNoName(t *testing.T) {
	m := map[string]any{
		"to": "a@e.com",
		"attachments": []any{
			map[string]any{"path": "tmp/report.pdf"}, // 无 name
		},
	}
	msg, err := mailx.FromMap(m)
	if err != nil {
		t.Fatal(err)
	}
	if len(msg.Attachments) != 1 {
		t.Fatalf("attachments = %+v, want 1", msg.Attachments)
	}
	if msg.Attachments[0].Name != "report.pdf" {
		t.Errorf("Name = %q, want derived report.pdf", msg.Attachments[0].Name)
	}
}

// TestFromMapAttachmentTypeError 验证 attachments 类型非法时返回错误而非 panic
func TestFromMapAttachmentTypeError(t *testing.T) {
	m := map[string]any{
		"to":          "a@e.com",
		"attachments": "not-a-list", // 非法类型
	}
	if _, err := mailx.FromMap(m); err == nil {
		t.Fatal("FromMap with invalid attachments type should error")
	}
}

func TestIsHTML(t *testing.T) {
	cases := []struct {
		in   string
		want bool
	}{
		{"<p>hi</p>", true},
		{"<h1>hello</h1>", true},
		{"<div class=\"a\">x</div>", true},
		{"a < b > c", false},        // 普通比较，不应误判
		{"plain text", false},       // 纯文本
		{"<123>", false},            // 无有效标签名
		{"<!-- comment -->", false}, // 注释
		{"", false},
	}
	for _, c := range cases {
		if got := mailx.IsHTML(c.in); got != c.want {
			t.Errorf("IsHTML(%q) = %v, want %v", c.in, got, c.want)
		}
	}
}

// TestFromMapAttachmentPaths 验证 attachments 为 []string（路径列表）
func TestFromMapAttachmentPaths(t *testing.T) {
	m := map[string]any{
		"to":          "a@e.com",
		"attachments": []string{"tmp/a.txt", "tmp/b.txt"},
	}
	msg, err := mailx.FromMap(m)
	if err != nil {
		t.Fatal(err)
	}
	if len(msg.Attachments) != 2 {
		t.Fatalf("attachments = %+v, want 2", msg.Attachments)
	}
	if msg.Attachments[0].Name != "a.txt" || msg.Attachments[0].Path != "tmp/a.txt" {
		t.Errorf("attachments[0] = %+v", msg.Attachments[0])
	}
}

// TestFromMapToListVariants 验证收件人多种输入形式
func TestFromMapToListVariants(t *testing.T) {
	// []any 形式
	m := map[string]any{"to": []any{"a@e.com", "b@e.com"}}
	msg, err := mailx.FromMap(m)
	if err != nil {
		t.Fatal(err)
	}
	if len(msg.To) != 2 || msg.To[0] != "a@e.com" {
		t.Errorf("To = %v", msg.To)
	}

	// 非法类型
	m = map[string]any{"to": 123}
	if _, err := mailx.FromMap(m); err == nil {
		t.Fatal("To with invalid type should error")
	}
}

// TestFromMapBodyFallback 验证 html 优先于 body
func TestFromMapBodyFallback(t *testing.T) {
	m := map[string]any{
		"to":   "a@e.com",
		"body": "plain body",
		"html": "<b>html body</b>",
	}
	msg, err := mailx.FromMap(m)
	if err != nil {
		t.Fatal(err)
	}
	if msg.Body != "<b>html body</b>" {
		t.Errorf("Body = %q, want html preferred", msg.Body)
	}
}

// TestFromBytesAllFields 验证 JSON 反序列化完整字段
func TestFromBytesAllFields(t *testing.T) {
	data := []byte(`{
		"from": "a@e.com",
		"to": ["b@e.com"],
		"cc": ["c@e.com"],
		"bcc": ["d@e.com"],
		"subject": "s",
		"textbody": "t",
		"body": "<p>h</p>",
		"replyto": "r@e.com",
		"attachments": [{"name": "a.txt", "data": "aGk="}],
		"inline": [{"cid": "cid1", "name": "i.png", "data": "aGk="}]
	}`)
	msg, err := mailx.FromBytes(data)
	if err != nil {
		t.Fatal(err)
	}
	if msg.From != "a@e.com" || len(msg.To) != 1 || msg.To[0] != "b@e.com" {
		t.Errorf("fields: %+v", msg)
	}
	if len(msg.Cc) != 1 || len(msg.Bcc) != 1 {
		t.Errorf("cc/bcc: %+v", msg)
	}
	if msg.TextBody != "t" || msg.Body != "<p>h</p>" || msg.ReplyTo != "r@e.com" {
		t.Errorf("body fields: %+v", msg)
	}
	if len(msg.Attachments) != 1 || msg.Attachments[0].Name != "a.txt" {
		t.Errorf("attachments: %+v", msg.Attachments)
	}
	if len(msg.Inline) != 1 || msg.Inline[0].CID != "cid1" {
		t.Errorf("inline: %+v", msg.Inline)
	}
}