package host

import (
	"context"
	"encoding/json"
	"os"

	"github.com/carlosframework/platform/internal/hostclaim"
	"github.com/carlosframework/platform/internal/provision"
	"github.com/carlosframework/platform/internal/registry"
	"github.com/carlosframework/platform/internal/release"
)

func rootClaimRecord(ctx context.Context, store release.Store, c *hostclaim.Claim, dataDir string) (registry.Route, string, error) {
	if c == nil || c.Holder == nil {
		return registry.Route{}, "", os.ErrPermission
	}
	h := c.Holder
	var rt registry.Route
	var etag, inc string
	if h.Family == "sidecar" {
		if h.Key != provision.SidecarRecordKey(h.Account, h.App, h.Name) {
			return rt, "", os.ErrPermission
		}
		body, e, err := store.Get(ctx, h.Key)
		if err != nil {
			return rt, "", err
		}
		var rec provision.SidecarRecord
		if json.Unmarshal(body, &rec) != nil || provision.ValidateSidecarShape(rec) != nil || rec.Account != h.Account || rec.App != h.App || rec.Name != h.Name || rec.Host != c.Host {
			return rt, "", os.ErrPermission
		}
		inc, err = hostclaim.Incarnation(rec.Account, rec.App, rec.Host, rec.CreatedAt)
		if err != nil {
			return rt, "", err
		}
		rt = registry.Route{Host: rec.Host, Account: rec.Account, App: rec.App, Kind: "sidecar", DBPath: provision.DefaultDBPath(dataDir, rec.Host)}
		etag = e
	} else {
		rec, e, err := provision.FindRecordByHost(ctx, store, c.Host)
		if err != nil {
			return rt, "", err
		}
		inc, err = hostclaim.Incarnation(rec.Account, rec.App, rec.Host, rec.CreatedAt)
		if err != nil {
			return rt, "", err
		}
		if h.Key != provision.RecordKey(rec.Account, rec.App, rec.Host) {
			return rt, "", os.ErrPermission
		}
		rt = registry.Route{Host: rec.Host, Account: rec.Account, App: rec.App, Kind: rec.KindOrDefault()}
		etag = e
		if rec.DerivesPaths() {
			rt.DBPath = provision.NestedDBPath(dataDir, rec.Host)
		}
	}
	if etag == "" || rt.Account != h.Account || rt.App != h.App || inc != h.Incarnation {
		return registry.Route{}, "", os.ErrPermission
	}
	return rt, etag, nil
}