package httpapi

import (
	"data-terminal-cloud/internal/devicefleet"
	"data-terminal-cloud/internal/saas"
	"errors"
	"fmt"
	"github.com/jackc/pgx/v5"
	"io"
	"net/http"
	"time"
)

func writeFleetError(w http.ResponseWriter, r *http.Request, err error) {
	if errors.Is(err, pgx.ErrNoRows) {
		WriteError(w, r, 404, "FIRMWARE_NOT_FOUND", "固件或设备不存在，请刷新后重试")
		return
	}
	var e *devicefleet.Error
	if errors.As(err, &e) {
		WriteError(w, r, 409, e.Code, e.Message)
	} else {
		writeSaaSError(w, r, err)
	}
}
func FleetFirmwareHandler(s *saas.Service, action string) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		p, public, ok := opsFirmwarePrincipal(w, r)
		if !ok {
			return
		}
		tenant, err := s.FleetTenant(r.Context(), p, public, r.Method == "POST")
		if err != nil {
			writeFleetError(w, r, err)
			return
		}
		id := r.PathValue("id")
		if id != "" && !validUUID(id) {
			WriteError(w, r, 400, "INVALID_ID", "固件ID不正确")
			return
		}
		var out any
		switch action {
		case "list":
			var items []devicefleet.Release
			items, err = s.Fleet.Releases(r.Context(), tenant)
			out = map[string]any{"items": items}
		case "models":
			var items []string
			items, err = s.Fleet.Models(r.Context(), tenant)
			out = map[string]any{"items": items}
		case "prepare":
			var input devicefleet.ReleaseInput
			if !decodeWebJSON(w, r, &input, "固件信息不正确") {
				return
			}
			out, err = s.Fleet.Prepare(r.Context(), tenant, input)
		case "finalize":
			out, err = s.Fleet.Finalize(r.Context(), tenant, id)
		case "download":
			out, err = s.Fleet.Download(r.Context(), tenant, id)
		}
		if err != nil {
			writeFleetError(w, r, err)
			return
		}
		WriteJSON(w, r, 200, out)
	})
}
func FleetDeviceHandler(s *saas.Service, upgrade bool) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		p, ok := resourcePrincipal(w, r, "id")
		if !ok {
			return
		}
		var out any
		var err error
		if upgrade {
			var in struct {
				Code int64 `json:"version_code"`
			}
			if !decodeWebJSON(w, r, &in, "目标版本顺序号不正确") {
				return
			}
			out, err = s.FleetOTA(r.Context(), p, r.PathValue("id"), RequestID(r.Context()), in.Code)
		} else {
			tenant := r.Header.Get("X-Tenant-Id")
			if tenant != "" && !validUUID(tenant) {
				WriteError(w, r, 400, "INVALID_TENANT", "租户ID不正确")
				return
			}
			out, err = s.FleetState(r.Context(), p, r.PathValue("id"), tenant)
		}
		if err != nil {
			writeFleetError(w, r, err)
			return
		}
		WriteJSON(w, r, 200, out)
	})
}

func FleetFirmwareDownloadHandler(s *devicefleet.Service) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		grant, err := s.ResolveDownload(r.Context(), r.PathValue("token"))
		if errors.Is(err, devicefleet.ErrDownloadTicketUnavailable) {
			http.NotFound(w, r)
			return
		}
		if err != nil {
			http.Error(w, "firmware download unavailable", http.StatusServiceUnavailable)
			return
		}
		object, err := s.OpenDownload(r.Context(), grant)
		if err != nil {
			http.Error(w, "firmware download unavailable", http.StatusServiceUnavailable)
			return
		}
		defer object.Close()
		serveFleetFirmwareContent(w, r, grant, object)
	})
}

func serveFleetFirmwareContent(w http.ResponseWriter, r *http.Request, grant devicefleet.DownloadGrant, object io.ReadSeeker) {
	_ = http.NewResponseController(w).SetWriteDeadline(time.Now().Add(20 * time.Minute))
	w.Header().Set("Accept-Ranges", "bytes")
	w.Header().Set("Cache-Control", "private, no-store")
	w.Header().Set("Content-Disposition", `attachment; filename="firmware.bin"`)
	w.Header().Set("Content-Type", "application/octet-stream")
	w.Header().Set("ETag", fmt.Sprintf(`"sha256-%s"`, grant.SHA256))
	w.Header().Set("Referrer-Policy", "no-referrer")
	w.Header().Set("X-Content-Type-Options", "nosniff")
	http.ServeContent(w, r, "firmware.bin", grant.CreatedAt, object)
}