package main

import (
	"regexp"
	"strings"
	"testing"

	"countrygame/web"
)

// Markdown the in-game renderer (web/js/ui/markdown.js) does not support.
var unsupportedMarkdown = []*regexp.Regexp{
	regexp.MustCompile("(?m)^```"),           // code blocks
	regexp.MustCompile(`!\[`),                // images
	regexp.MustCompile(`\]\(`),               // links
	regexp.MustCompile(`</?[a-zA-Z]+[^>]*>`), // HTML
	regexp.MustCompile(`(?m)^[ \t]+[-*] `),   // nested lists
}

// rulesShape counts the building blocks of a rules file so the two languages can be compared.
func rulesShape(src string) map[string]int {
	counts := map[string]int{}
	inTable := false
	for _, line := range strings.Split(strings.ReplaceAll(src, "\r\n", "\n"), "\n") {
		if strings.HasPrefix(line, "|") {
			if !inTable {
				counts["tables"]++
			}
			inTable = true
			continue
		}
		inTable = false
		switch {
		case strings.HasPrefix(line, "### "):
			counts["h3"]++
		case strings.HasPrefix(line, "## "):
			counts["h2"]++
		case strings.HasPrefix(line, "# "):
			counts["h1"]++
		case strings.HasPrefix(line, "- "):
			counts["bullets"]++
		case strings.HasPrefix(line, ">"):
			counts["quotes"]++
		case strings.TrimSpace(line) == "---":
			counts["rules"]++
		}
	}
	return counts
}

// The rules are shown in the game by a tiny Markdown renderer, so the files may only use what it supports,
// and the English and French versions must have the same shape.
func TestRulesFiles(t *testing.T) {
	files := map[string]string{}
	for _, lang := range []string{"en", "fr"} {
		raw, err := web.Files.ReadFile("data/rules/rules." + lang + ".md")
		if err != nil {
			t.Fatalf("rules.%s.md: %v", lang, err)
		}
		files[lang] = string(raw)
		for _, bad := range unsupportedMarkdown {
			if bad.MatchString(files[lang]) {
				t.Errorf("rules.%s.md uses Markdown the in-game renderer does not support: %s", lang, bad)
			}
		}
	}

	en, fr := rulesShape(files["en"]), rulesShape(files["fr"])
	if en["h1"] != 1 {
		t.Errorf("the rules need exactly one # title, found %d", en["h1"])
	}
	for _, k := range []string{"h1", "h2", "h3", "tables", "bullets", "quotes", "rules"} {
		if en[k] != fr[k] {
			t.Errorf("rules structure differs between languages: %s en=%d fr=%d", k, en[k], fr[k])
		}
	}
	if en["h2"] < 8 {
		t.Errorf("the rules look too short: only %d sections", en["h2"])
	}
}