package main

import (
	"embed"
	"fmt"
	"strconv"
	"strings"

	"amadan.net/rastrillo/rastrillo"

	"amadan.net/rastrillo/abono"
)

//go:embed locales/en.toml
var localesFS embed.FS

// Catalog is the base message catalog the example runs on: abono's
// English, then the example's own (locales/en.toml, the "example.*" keys
// its layout and pages use). A key belongs to the module that renders it,
// so abono's catalog has none of these.
func Catalog() rastrillo.Catalog {
	cat := abono.Catalog()
	own, err := ownCatalog()
	if err != nil {
		panic(fmt.Sprintf("example: locales/en.toml: %v", err)) // a build bug
	}
	for k, v := range own {
		cat[k] = v
	}
	return cat
}

// ownCatalog is locales/en.toml: one key = "value" per line, with #
// comments and blank lines, the flat format rastrillo's catalogs use.
func ownCatalog() (rastrillo.Catalog, error) {
	data, err := localesFS.ReadFile("locales/en.toml")
	if err != nil {
		return nil, err
	}
	out := rastrillo.Catalog{}
	for i, raw := range strings.Split(string(data), "\n") {
		line := strings.TrimSpace(raw)
		if line == "" || strings.HasPrefix(line, "#") {
			continue
		}
		key, val, ok := strings.Cut(line, " = ")
		text, err := strconv.Unquote(strings.TrimSpace(val))
		if !ok || key == "" || err != nil {
			return nil, fmt.Errorf("line %d: want key = \"value\"", i+1)
		}
		if _, dup := out[key]; dup {
			return nil, fmt.Errorf("line %d: duplicate key %q", i+1, key)
		}
		out[key] = text
	}
	return out, nil
}