package api

import (
	"encoding/json"
	"log/slog"

	"github.com/alexei/tinyforge/internal/store"
	"github.com/alexei/tinyforge/internal/workload/plugin"
)

// toPluginWorkload converts a persisted store.Workload row into the value
// shape that Source / Trigger plugins consume. Lives in the api package
// (rather than store or plugin) to keep plugin's dependency graph free of
// store imports and avoid the cycle that would form otherwise.
//
// SourceConfig / TriggerConfig are passed through as raw JSON; the matching
// plugin decodes them with plugin.SourceConfigOf[T] / TriggerConfigOf[T].
// PublicFaces is decoded eagerly because every consumer needs the parsed
// slice (proxy registration, UI, validation).
func toPluginWorkload(w store.Workload) plugin.Workload {
	var faces []plugin.PublicFace
	if w.PublicFaces != "" {
		if err := json.Unmarshal([]byte(w.PublicFaces), &faces); err != nil {
			slog.Warn("workload: invalid public_faces JSON, treating as empty",
				"workload", w.ID, "error", err)
			faces = nil
		}
	}
	return plugin.Workload{
		ID:                      w.ID,
		Name:                    w.Name,
		GroupID:                 w.AppID,
		ParentWorkloadID:        w.ParentWorkloadID,
		SourceKind:              w.SourceKind,
		SourceConfig:            json.RawMessage(w.SourceConfig),
		TriggerKind:             w.TriggerKind,
		TriggerConfig:           json.RawMessage(w.TriggerConfig),
		PublicFaces:             faces,
		NotificationURL:         w.NotificationURL,
		NotificationSecret:      w.NotificationSecret,
		WebhookSecret:           w.WebhookSecret,
		WebhookSigningSecret:    w.WebhookSigningSecret,
		WebhookRequireSignature: w.WebhookRequireSignature,
		CreatedAt:               w.CreatedAt,
		UpdatedAt:               w.UpdatedAt,
	}
}

// fromPluginWorkload is the symmetric direction — used by /api/workloads
// create + update handlers. Returns a store.Workload ready to pass to
// store.CreateWorkload / store.UpdateWorkload. The caller is responsible
// for re-encoding PublicFaces; we do it here to keep the JSON shape in
// one place.
func fromPluginWorkload(p plugin.Workload) (store.Workload, error) {
	facesJSON := "[]"
	if len(p.PublicFaces) > 0 {
		b, err := json.Marshal(p.PublicFaces)
		if err != nil {
			return store.Workload{}, err
		}
		facesJSON = string(b)
	}
	srcCfg := string(p.SourceConfig)
	if srcCfg == "" {
		srcCfg = "{}"
	}
	trgCfg := string(p.TriggerConfig)
	if trgCfg == "" {
		trgCfg = "{}"
	}
	return store.Workload{
		ID:                      p.ID,
		Name:                    p.Name,
		AppID:                   p.GroupID,
		ParentWorkloadID:        p.ParentWorkloadID,
		SourceKind:              p.SourceKind,
		SourceConfig:            srcCfg,
		TriggerKind:             p.TriggerKind,
		TriggerConfig:           trgCfg,
		PublicFaces:             facesJSON,
		NotificationURL:         p.NotificationURL,
		NotificationSecret:      p.NotificationSecret,
		WebhookSecret:           p.WebhookSecret,
		WebhookSigningSecret:    p.WebhookSigningSecret,
		WebhookRequireSignature: p.WebhookRequireSignature,
		CreatedAt:               p.CreatedAt,
		UpdatedAt:               p.UpdatedAt,
	}, nil
}