package main

import (
	"encoding/json"
	"os"
	"path/filepath"
	"testing"
)

// The module's directory, where its manifest and its files/ are.
const moduleDir = "../.."

// templateText is the text a file resource places on the machine: its template's, in the module's files/
// (novox/hq ADR 0349 §2). A resource that names no template, or a template that is not there, fails the test.
func templateText(t *testing.T, r map[string]any) string {
	t.Helper()
	name, _ := r["template"].(string)
	if name == "" {
		t.Fatalf("resource %v names no template", r["id"])
	}
	raw, err := os.ReadFile(filepath.Join(moduleDir, filepath.FromSlash(name)))
	if err != nil {
		t.Fatalf("resource %v names %s: %v", r["id"], name, err)
	}
	return string(raw)
}

// No file resource carries its text inline: each names its template in files/, and the build packs files/
// into the one archive the controller reads the templates back from (novox/hq ADR 0349 §2).
func TestEveryFileTakesItsTextFromATemplate(t *testing.T) {
	raw, err := os.ReadFile(filepath.Join(moduleDir, "module.json"))
	if err != nil {
		t.Fatal(err)
	}
	var m struct {
		Resources []map[string]any `json:"resources"`
		Build     struct {
			Artifacts []map[string]any `json:"artifacts"`
		} `json:"build"`
	}
	if err := json.Unmarshal(raw, &m); err != nil {
		t.Fatal(err)
	}
	for _, r := range m.Resources {
		if _, inline := r["content"]; inline {
			t.Errorf("resource %v keeps its text inline: keep it in files/ and name it as the template", r["id"])
		}
		if r["type"] == "file" {
			templateText(t, r)
		}
	}
	packs := 0
	for _, a := range m.Build.Artifacts {
		if a["kind"] == "archive" && a["from"] == "files" {
			packs++
			if a["name"] != "files" {
				t.Errorf("the templates archive is named %v, not files", a["name"])
			}
		}
	}
	if packs != 1 {
		t.Errorf("the build packs files/ into %d archives, not one", packs)
	}
}