package memoir

import (
	"data-terminal-cloud/internal/identity"
	"encoding/json"
	"errors"
	"github.com/jackc/pgx/v5"
	"io"
	"net/http"
)

func (s *Service) RegisterRoutes(mux *http.ServeMux, wrap func(http.Handler) http.Handler) {
	for _, op := range []string{"query", "generate", "import"} {
		mux.Handle("POST /api/v1/memoirs/"+op, wrap(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
			p, ok := identity.PrincipalFromContext(r.Context())
			if !ok {
				write(w, nil, errors.New("AUTHENTICATION_REQUIRED"))
				return
			}
			body, e := io.ReadAll(io.LimitReader(r.Body, 200001))
			if e != nil || len(body) > 200000 {
				write(w, nil, errors.New("MEMOIR_IMPORT_INVALID"))
				return
			}
			if op == "import" {
				var in ImportInput
				if e = json.Unmarshal(body, &in); e != nil {
					write(w, nil, errors.New("MEMOIR_IMPORT_INVALID"))
					return
				}
				id, e := s.Import(r.Context(), p, in)
				write(w, map[string]string{"import_id": id}, e)
				return
			}
			var in struct {
				ElderID string `json:"elder_id"`
			}
			if json.Unmarshal(body, &in) != nil {
				write(w, nil, errors.New("MEMOIR_IMPORT_INVALID"))
				return
			}
			if op == "query" {
				v, e := s.Query(r.Context(), p, in.ElderID)
				write(w, v, e)
			} else {
				id, e := s.Enqueue(r.Context(), p, in.ElderID)
				write(w, map[string]string{"job_id": id}, e)
			}
		})))
	}
	mux.Handle("GET /api/v1/memoirs/illustrations/{id}", wrap(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		p, ok := identity.PrincipalFromContext(r.Context())
		if !ok {
			write(w, nil, errors.New("AUTHENTICATION_REQUIRED"))
			return
		}
		var elder, digest string
		e := s.Pool.QueryRow(r.Context(), `SELECT sp.public_id::text,md.source_digest FROM memoir_illustration mi JOIN memoir_document md ON md.id=mi.document_id JOIN subject_profile sp ON sp.id=md.subject_id WHERE mi.id=$1::uuid`, r.PathValue("id")).Scan(&elder, &digest)
		if e != nil {
			write(w, nil, errors.New("MEMOIR_NOT_FOUND"))
			return
		}
		a, e := s.access(r.Context(), s.Pool, p, elder, false)
		if e != nil {
			write(w, nil, e)
			return
		}
		_, current, e := s.sources(r.Context(), s.Pool, a)
		if e != nil || current != digest {
			write(w, nil, ErrStale)
			return
		}
		var b []byte
		e = s.Pool.QueryRow(r.Context(), `SELECT content FROM memoir_illustration WHERE id=$1::uuid`, r.PathValue("id")).Scan(&b)
		if errors.Is(e, pgx.ErrNoRows) {
			write(w, nil, errors.New("MEMOIR_NOT_FOUND"))
			return
		}
		if e != nil {
			write(w, nil, e)
			return
		}
		w.Header().Set("Content-Type", "image/jpeg")
		w.Header().Set("Cache-Control", "private, no-store")
		w.Header().Set("X-Content-Type-Options", "nosniff")
		w.Write(b)
	})))
}
func write(w http.ResponseWriter, v any, e error) {
	w.Header().Set("Content-Type", "application/json; charset=utf-8")
	w.Header().Set("Cache-Control", "no-store")
	if e == nil {
		json.NewEncoder(w).Encode(map[string]any{"ok": true, "data": v})
		return
	}
	code := e.Error()
	status := 400
	var typed interface{ HTTPStatus() int }
	if errors.As(e, &typed) {
		status = typed.HTTPStatus()
	}
	switch code {
	case "AUTHENTICATION_REQUIRED":
		status = 401
	case "MEMOIR_CONSENT_REQUIRED", "TRANSCRIPT_ACCESS_DENIED":
		status = 403
	case "MEMOIR_NOT_FOUND":
		status = 404
	case "MEMOIR_SOURCE_CHANGED", "MEMOIR_IMPORT_CONFLICT":
		status = 409
	}
	if len(code) > 80 || status == 503 {
		code = "MEMOIR_SERVICE_UNAVAILABLE"
		status = 503
	}
	w.WriteHeader(status)
	json.NewEncoder(w).Encode(map[string]any{"ok": false, "code": code, "error": map[string]any{"code": code, "message": code, "retryable": status == 503}})
}