package httpapi

import (
	"errors"
	"net/http"
	"strings"

	"git.118im.com/im_team/im_workbench/internal/portal"
	"git.118im.com/im_team/im_workbench/internal/store"
)

var publicContentKeys = map[string]struct{}{
	"privacy_policy": {},
	"user_agreement": {},
}

func (a *API) home(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		methodNotAllowed(w, r, http.MethodGet)
		return
	}
	if !a.ensurePortal(w, r) {
		return
	}
	principal, ok := a.authenticateMember(w, r)
	if !ok {
		return
	}
	profile, err := a.accounts.Profile(r.Context(), principal.TenantID, principal.MemberID)
	if err != nil {
		writeProfileError(w, r, err)
		return
	}
	result, err := a.portal.Home(r.Context(), principal.TenantID, principal.MemberID, profile)
	if err != nil {
		writePortalError(w, r, err)
		return
	}
	writeSuccess(w, r, result)
}

func (a *API) banners(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		methodNotAllowed(w, r, http.MethodGet)
		return
	}
	if !a.ensurePortal(w, r) {
		return
	}
	principal, ok := a.authenticateMember(w, r)
	if !ok {
		return
	}
	position := strings.TrimSpace(r.URL.Query().Get("position"))
	if position == "" {
		position = "home_top"
	}
	items, err := a.portal.Banners(r.Context(), principal.TenantID, position)
	if err != nil {
		writePortalError(w, r, err)
		return
	}
	writeSuccess(w, r, items)
}

func (a *API) content(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		methodNotAllowed(w, r, http.MethodGet)
		return
	}
	if !a.ensurePortal(w, r) {
		return
	}
	if a.auth == nil {
		writeError(w, r, http.StatusServiceUnavailable, 90001, "SERVICE_UNAVAILABLE", "service unavailable", nil)
		return
	}
	key := strings.TrimPrefix(r.URL.Path, "/v1/contents/")
	key = strings.ToLower(strings.TrimSpace(key))
	if strings.Contains(key, "/") {
		writePortalError(w, r, portal.ErrContentKeyInvalid)
		return
	}
	tenantID := a.auth.DefaultTenantID()
	if _, public := publicContentKeys[key]; !public {
		principal, ok := a.authenticateMember(w, r)
		if !ok {
			return
		}
		tenantID = principal.TenantID
	}
	result, err := a.portal.Content(r.Context(), tenantID, key)
	if err != nil {
		writePortalError(w, r, err)
		return
	}
	writeSuccess(w, r, result)
}

func (a *API) memberLevels(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		methodNotAllowed(w, r, http.MethodGet)
		return
	}
	if !a.ensurePortal(w, r) {
		return
	}
	principal, ok := a.authenticateMember(w, r)
	if !ok {
		return
	}
	items, err := a.portal.MemberLevels(r.Context(), principal.TenantID)
	if err != nil {
		writePortalError(w, r, err)
		return
	}
	writeSuccess(w, r, items)
}

func (a *API) leaderboard(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		methodNotAllowed(w, r, http.MethodGet)
		return
	}
	if !a.ensurePortal(w, r) {
		return
	}
	principal, ok := a.authenticateMember(w, r)
	if !ok {
		return
	}
	items, err := a.portal.Leaderboard(r.Context(), principal.TenantID)
	if err != nil {
		writePortalError(w, r, err)
		return
	}
	writeSuccess(w, r, items)
}

func (a *API) customerServices(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		methodNotAllowed(w, r, http.MethodGet)
		return
	}
	if !a.ensurePortal(w, r) {
		return
	}
	principal, ok := a.authenticateMember(w, r)
	if !ok {
		return
	}
	items, err := a.portal.CustomerServices(r.Context(), principal.TenantID)
	if err != nil {
		writePortalError(w, r, err)
		return
	}
	writeSuccess(w, r, items)
}

func (a *API) notices(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		methodNotAllowed(w, r, http.MethodGet)
		return
	}
	if !a.ensurePortal(w, r) {
		return
	}
	principal, ok := a.authenticateMember(w, r)
	if !ok {
		return
	}
	page, ok := optionalPositiveInt(w, r, "page")
	if !ok {
		writePortalError(w, r, portal.ErrPageInvalid)
		return
	}
	pageSize, ok := optionalPositiveInt(w, r, "page_size")
	if !ok {
		writePortalError(w, r, portal.ErrPageSizeInvalid)
		return
	}
	result, err := a.portal.Notices(r.Context(), principal.TenantID, principal.MemberID, page, pageSize)
	if err != nil {
		writePortalError(w, r, err)
		return
	}
	writeSuccess(w, r, result)
}

func (a *API) ensurePortal(w http.ResponseWriter, r *http.Request) bool {
	if a.portal != nil {
		return true
	}
	writeError(w, r, http.StatusServiceUnavailable, 90001, "SERVICE_UNAVAILABLE", "service unavailable", nil)
	return false
}

func writePortalError(w http.ResponseWriter, r *http.Request, err error) {
	switch {
	case errors.Is(err, portal.ErrPositionInvalid):
		writeError(w, r, http.StatusBadRequest, 30000, "BANNER_POSITION_INVALID", "validation failed", map[string]any{"field": "position"})
	case errors.Is(err, portal.ErrContentKeyInvalid):
		writeError(w, r, http.StatusBadRequest, 30000, "CONTENT_KEY_INVALID", "validation failed", map[string]any{"field": "content_key"})
	case errors.Is(err, portal.ErrPageInvalid):
		writeError(w, r, http.StatusBadRequest, 30000, "PAGE_INVALID", "validation failed", map[string]any{"field": "page"})
	case errors.Is(err, portal.ErrPageSizeInvalid):
		writeError(w, r, http.StatusBadRequest, 30000, "PAGE_SIZE_INVALID", "validation failed", map[string]any{"field": "page_size"})
	case errors.Is(err, store.ErrResourceNotFound):
		writeError(w, r, http.StatusNotFound, 30044, "RESOURCE_NOT_FOUND", "resource not found", nil)
	default:
		writeError(w, r, http.StatusInternalServerError, 90000, reasonInternal, "internal error", nil)
	}
}