package httpserver

import (
	"net/http"
	"net/url"
	"strconv"
	"time"

	"git.yuntuo.hk/k2safe/orbit/internal/fault"
	core "git.yuntuo.hk/k2safe/orbit/model"
	"git.yuntuo.hk/k2safe/orbit/platform/auth"
	"git.yuntuo.hk/k2safe/orbit/weave/instance"
	weave "git.yuntuo.hk/k2safe/orbit/weave/model"
)

func workflowListQuery(r *http.Request) (instance.ListInput, error) {
	var in instance.ListInput
	q, err := url.ParseQuery(r.URL.RawQuery)
	if err != nil {
		return in, fault.Invalid("invalid query encoding")
	}
	for k, v := range q {
		if len(v) != 1 {
			return in, fault.Invalid("duplicate query parameter")
		}
		switch k {
		case "definition_id", "version", "state", "paused", "business_key", "created_from", "created_before", "limit", "cursor":
		default:
			return in, fault.Invalid("unknown query parameter")
		}
		if v[0] == "" {
			return in, fault.Invalid("empty query parameter")
		}
	}
	in.DefinitionID = core.ID(q.Get("definition_id"))
	in.Version = q.Get("version")
	in.State = weave.InstanceState(q.Get("state"))
	in.BusinessKey = q.Get("business_key")
	in.Cursor = q.Get("cursor")
	if q.Has("limit") {
		in.Limit, err = strconv.Atoi(q.Get("limit"))
		if err != nil || in.Limit <= 0 {
			return in, fault.Invalid("invalid limit")
		}
	}
	if q.Has("paused") {
		v := q.Get("paused")
		if v != "true" && v != "false" {
			return in, fault.Invalid("paused must be true or false")
		}
		b := v == "true"
		in.Paused = &b
	}
	for name, field := range map[string]**time.Time{"created_from": &in.CreatedFrom, "created_before": &in.CreatedBefore} {
		if !q.Has(name) {
			continue
		}
		v, err := time.Parse(time.RFC3339Nano, q.Get(name))
		if err != nil {
			return in, fault.Invalid("invalid creation time bound")
		}
		*field = &v
	}
	return in, nil
}
func registerWorkflowQuery(mux *http.ServeMux, s *instance.Service) {
	mux.HandleFunc("GET /v1/workflows", wrap(func(r *http.Request, t auth.Token) (any, int, error) {
		in, err := workflowListQuery(r)
		if err != nil {
			return nil, 0, err
		}
		out, err := s.List(r.Context(), t, in)
		return out, 200, err
	}))
}