// pvfdump 打印 Script.pvf 里指定文件的内容（可截断、可按子串过滤行）。
// 用来核对 NPC 列表、城镇刷怪配置等 PVF 文本，而不是靠猜。
//
//	go run ./cmd/scratch/pvfdump -pvf <path> -file npc/npc.lst -grep boken
package main

import (
	"flag"
	"fmt"
	"os"
	"strings"

	platformpvf "longheng.io/server/internal/platform/pvf"
)

func main() {
	pvfPath := flag.String("pvf", `../runtime/data/dnf/Script.pvf`, "Script.pvf path")
	file := flag.String("file", "", "归档内路径")
	grep := flag.String("grep", "", "只打印包含该子串的行（大小写不敏感）")
	head := flag.Int("head", 60, "最多打印多少行（0=全部）")
	tail := flag.Int("tail", 0, "只打印最后 N 行")
	flag.Parse()

	if strings.TrimSpace(*file) == "" {
		fmt.Fprintln(os.Stderr, "usage: pvfdump -file <archive path> [-grep s] [-head n]")
		os.Exit(2)
	}

	archive, err := platformpvf.Open(*pvfPath)
	if err != nil {
		fmt.Fprintln(os.Stderr, "open:", err)
		os.Exit(1)
	}

	text, err := archive.ReadText(*file)
	if err != nil {
		fmt.Fprintf(os.Stderr, "read %s: %v\n", *file, err)
		os.Exit(1)
	}
	lines := strings.Split(strings.ReplaceAll(text, "\r\n", "\n"), "\n")
	fmt.Printf("file=%s lines=%d\n", *file, len(lines))

	needle := strings.ToLower(strings.TrimSpace(*grep))
	hit := 0
	printed := 0
	for _, line := range lines {
		if needle != "" && !strings.Contains(strings.ToLower(line), needle) {
			continue
		}
		hit++
	}
	if needle != "" {
		fmt.Printf("grep=%q hits=%d\n", needle, hit)
	}

	start := 0
	end := len(lines)
	if needle == "" {
		if *tail > 0 && *tail < len(lines) {
			start = len(lines) - *tail
		}
		if *head > 0 && end-start > *head {
			end = start + *head
		}
	}
	for i := start; i < end; i++ {
		line := lines[i]
		if needle != "" && !strings.Contains(strings.ToLower(line), needle) {
			continue
		}
		fmt.Printf("%6d| %s\n", i+1, line)
		printed++
		if *head > 0 && needle != "" && printed >= *head {
			break
		}
	}
}