package api

import (
	"net/http"

	"git.golem15.com/golem15/sm-journal-plugin/classes"
	"git.golem15.com/golem15/summercms/modules/backpack"
	"git.golem15.com/golem15/summercms/modules/wire"
)

// FixHeadings is POST /_journal/api/v1/fix-headings {dry_run}: the
// journal:fix-headings conversion of stored H1 headings (posts in every
// locale and category pillar text), for golem15.journal.manage_settings. It
// is a dry run unless dry_run is false, and answers {posts, categories,
// headings, dry_run}. While the H1 setting is off it refuses with 409 and
// the refusal phrase. MCP journal_fix_headings.
func FixHeadings(app *backpack.App) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		r, pr, ok := requireBackendPrincipal(app, w, r)
		if !ok || !requireManageSettings(w, pr) {
			return
		}
		db, err := gdb(app)
		if err != nil {
			writeAPIError(w, http.StatusInternalServerError, "Internal server error")
			return
		}
		body, err := readJSONObject(r)
		if err != nil {
			writeAPIError(w, http.StatusBadRequest, errValidationFailed)
			return
		}
		dry := true
		if v, has := body["dry_run"]; has && v != nil {
			dry = asBool(v)
		}
		if !classes.EffectiveH1ToH2(r.Context(), db, appConfig(app)) {
			writeAPIError(w, http.StatusConflict, classes.H1ConversionOffText)
			return
		}
		res, err := classes.FixStoredHeadings(r.Context(), app, db, !dry)
		if err != nil {
			writeAPIError(w, http.StatusInternalServerError, "Internal server error")
			return
		}
		wire.WriteJSON(w, http.StatusOK, map[string]any{
			"posts":      res.Posts,
			"categories": res.Categories,
			"headings":   res.Headings,
			"dry_run":    dry,
		})
	}
}