package markdown

import (
	"bytes"
	"io"
	"os"
	"strings"
)

// Builder 用于拼接 Markdown 文本（原 stock internal/logic/a、gostock internal/logic/libs 中重复实现）。
type Builder struct {
	buf bytes.Buffer
}

// MarkdownBuilder 兼容旧项目中的类型名。
type MarkdownBuilder = Builder

func NewBuilder() *Builder {
	return &Builder{}
}

// NewMarkdownBuilder 兼容旧项目中的构造函数名。
func NewMarkdownBuilder() *Builder {
	return NewBuilder()
}

func (m *Builder) Title(title string) {
	m.buf.WriteString("# " + title + "\n\n")
}

func (m *Builder) Catalog(text string) {
	m.buf.WriteString("## " + text + "\n\n")
}

func (m *Builder) Text(text string) {
	m.buf.WriteString(text + "\n\n")
}

func (m *Builder) KvText(key, val string) {
	m.buf.WriteString(key + " ：" + val + "   \n")
}

func (m *Builder) BR() {
	m.buf.WriteString("\n")
}

func (m *Builder) Code(lang, code string) {
	m.buf.WriteString("```" + lang + "\n")
	m.buf.WriteString(code + "\n")
	m.buf.WriteString("```\n\n")
}

// Table 生成 Markdown 表格。
func (m *Builder) Table(catalog string, headers []string, rows [][]string) {
	if catalog != "" {
		m.buf.WriteString("## " + catalog + "\n")
	}
	m.buf.WriteString("| " + strings.Join(headers, " | ") + " |\n")

	m.buf.WriteString("| ")
	for _, header := range headers {
		m.buf.WriteString(strings.Repeat("-", len(header)) + "|")
	}
	m.buf.WriteString("\n")
	for _, row := range rows {
		m.buf.WriteString("| " + strings.Join(row, " | ") + " |\n")
	}
}

func (m *Builder) Build() string {
	return m.buf.String()
}

func (m *Builder) SaveToFile(filePath string) error {
	rf, err := os.OpenFile(filePath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0o644)
	if err != nil {
		return err
	}
	defer rf.Close()

	_, err = io.Copy(rf, &m.buf)
	return err
}