package main

import (
	"bytes"
	"os"
	"path/filepath"
)

// The bn chrome files authored in cms/backend/templates/bn and mechanically
// synced (make sync-templates) into the sibling core repo's templates/bn.
// Guest-side plugin templates compile core's copy into their wasm, so the two
// checkouts must stay byte-identical. validation.go is intentionally NOT in
// this set (cms's is a two-context-key bridge over the SDK tracker); neither
// is img.templ (cms-only, not referenced by the chrome).
// See cms docs/superpowers/specs/2026-07-07-bn-chrome-single-source-design.md.
var templateSyncSet = []string{
	"head.templ",
	"toolbar.templ",
	"engagement.templ",
	"asset_hooks.go",
}

func init() {
	register(Check{
		Seq:   310,
		ID:    "31",
		Title: "bn chrome templates in sync between cms and core",
		Run: func(ctx *ScanContext, rep *Reporter) {
			cmsDir := filepath.Join(ctx.repoRoot, "backend", "templates", "bn")
			if _, err := os.Stat(cmsDir); err != nil {
				rep.Skip("no backend/templates/bn in this repo — template-sync gate not applicable")
				return
			}
			coreDir := filepath.Join(ctx.repoRoot, "..", "core", "templates", "bn")
			if _, err := os.Stat(coreDir); err != nil {
				rep.Skip("sibling core checkout not found — cannot verify template sync")
				return
			}

			var drifted []string
			for _, name := range templateSyncSet {
				cmsBytes, err := os.ReadFile(filepath.Join(cmsDir, name))
				if err != nil {
					drifted = append(drifted, name+" (unreadable in cms: "+err.Error()+")")
					continue
				}
				coreBytes, err := os.ReadFile(filepath.Join(coreDir, name))
				if err != nil {
					drifted = append(drifted, name+" (missing in core)")
					continue
				}
				if !bytes.Equal(cmsBytes, coreBytes) {
					drifted = append(drifted, name)
				}
			}

			if len(drifted) > 0 {
				rep.Fail("%d bn chrome file(s) drifted between cms and core", len(drifted))
				for _, name := range drifted {
					rep.Findingf("templates/bn/%s differs — cms is the authoring source; run `make sync-templates` in cms, then commit + tag + push core", name)
				}
			} else {
				rep.OK("bn chrome sync set byte-identical across cms and core (%d files)", len(templateSyncSet))
			}
		},
	})
}