// Package internal 包含 hxclaw 的内部工具模块
// 提供配置管理、Markdown 渲染、输入读取等功能
package internal

import (
	"os"
	"strconv"
	"strings"

	"charm.land/glamour/v2"
	"github.com/charmbracelet/x/term"
)

// RenderMarkdown 将 Markdown 文本渲染为终端友好的格式
// 支持通过配置或环境变量指定渲染主题和换行宽度
func RenderMarkdown(md string) string {
	if md == "" {
		return ""
	}

	style := getStyle()
	wrapWidth := getWrapWidth()

	r, err := glamour.NewTermRenderer(
		glamour.WithStandardStyle(style),
		glamour.WithWordWrap(wrapWidth),
	)
	if err != nil {
		return md
	}
	defer r.Close()

	out, err := r.Render(md)
	if err != nil {
		return md
	}

	return out
}

func RenderParagraph(text string) string {
	if text == "" {
		return ""
	}

	text = strings.TrimRight(text, "\n")

	if text == "" {
		return ""
	}

	style := getStyle()
	wrapWidth := getWrapWidth()

	r, err := glamour.NewTermRenderer(
		glamour.WithStandardStyle(style),
		glamour.WithWordWrap(wrapWidth),
	)
	if err != nil {
		return text
	}
	defer r.Close()

	out, err := r.Render(text)
	if err != nil {
		return text
	}

	return out
}

func getStyle() string {
	if cfg := GetProjectConfig(); cfg != nil {
		if cfg.Markdown.Theme != "" {
			return cfg.Markdown.Theme
		}
	}
	if s := os.Getenv("GLAMOUR_STYLE"); s != "" {
		return s
	}
	return "dark"
}

func getWrapWidth() int {
	if cfg := GetProjectConfig(); cfg != nil {
		if cfg.Markdown.LineWidth > 0 {
			return cfg.Markdown.LineWidth
		}
		if cfg.Markdown.LineWidth < 0 {
			return 0
		}
	}

	if cols := os.Getenv("COLUMNS"); cols != "" {
		if w, err := strconv.Atoi(cols); err == nil && w > 0 {
			return w
		}
	}

	if cols := os.Getenv("LINES"); cols != "" {
		if w, err := strconv.Atoi(cols); err == nil && w > 0 {
			return w
		}
	}

	width, _, err := term.GetSize(0)
	if err != nil || width <= 0 {
		return 0
	}
	return width
}