package controller

import (
	"fmt"
	"net/http"
	"strconv"
	"strings"

	"github.com/QuantumNous/new-api/common"
	"github.com/QuantumNous/new-api/model"
	"github.com/QuantumNous/new-api/service"
	"github.com/gin-gonic/gin"
	"gorm.io/gorm"
)

type AdminVideoChannelBinding struct {
	Group     string `json:"group"`
	Family    string `json:"family"`
	ChannelID int    `json:"channel_id"`
}

type adminVideoChannelBindingRequest struct {
	Bindings []AdminVideoChannelBinding `json:"bindings"`
}

type validatedAdminVideoChannelBinding struct {
	AdminVideoChannelBinding
	ChannelType int
}

type AdminVideoChannelCandidate struct {
	ID   int    `json:"id"`
	Name string `json:"name"`
	Type int    `json:"type"`
}

type adminVideoChannelBindingRow struct {
	Group       string                       `json:"group"`
	ChannelID   int                          `json:"channel_id"`
	ChannelName string                       `json:"channel_name"`
	ChannelType int                          `json:"channel_type"`
	Candidates  []AdminVideoChannelCandidate `json:"candidates"`
}

type adminVideoChannelBindingFamily struct {
	Key      string                        `json:"key"`
	Name     string                        `json:"name"`
	Bindings []adminVideoChannelBindingRow `json:"bindings"`
}

func videoAssetFamilyFromString(value string) (service.VideoAssetFamily, bool) {
	family := service.VideoAssetFamily(strings.TrimSpace(value))
	for _, candidate := range service.VideoAssetFamilies() {
		if family == candidate {
			return family, true
		}
	}
	return "", false
}

func GetUserVideoChannelBindings(c *gin.Context) {
	userID, err := strconv.Atoi(c.Param("id"))
	if err != nil || userID <= 0 {
		common.ApiErrorMsg(c, "invalid user id")
		return
	}
	if _, err = model.GetUserById(userID, false); err != nil {
		common.ApiError(c, err)
		return
	}
	groups, err := model.GetUserConcreteTokenGroups(userID)
	if err != nil {
		common.ApiError(c, err)
		return
	}
	visibleGroupSet := make(map[string]struct{}, len(groups))
	families := make([]adminVideoChannelBindingFamily, 0, len(service.VideoAssetFamilies()))
	for _, family := range service.VideoAssetFamilies() {
		rows := make([]adminVideoChannelBindingRow, 0, len(groups))
		for _, group := range groups {
			candidates, err := service.GetVideoAssetChannelCandidates(group, family)
			if err != nil {
				common.ApiError(c, err)
				return
			}
			if len(candidates) == 0 {
				continue
			}
			visibleGroupSet[group] = struct{}{}
			row := adminVideoChannelBindingRow{Group: group, Candidates: make([]AdminVideoChannelCandidate, 0, len(candidates))}
			for _, channel := range candidates {
				row.Candidates = append(row.Candidates, AdminVideoChannelCandidate{ID: channel.Id, Name: channel.Name, Type: channel.Type})
			}
			bindings, err := model.GetUserAssetChannelsByTypes(userID, service.VideoAssetChannelTypesForFamily(family), group)
			if err != nil {
				common.ApiError(c, err)
				return
			}
			for _, binding := range bindings {
				for _, candidate := range candidates {
					if candidate.Id == binding.ChannelId {
						row.ChannelID = candidate.Id
						row.ChannelName = candidate.Name
						row.ChannelType = candidate.Type
						break
					}
				}
				if row.ChannelID != 0 {
					break
				}
			}
			rows = append(rows, row)
		}
		families = append(families, adminVideoChannelBindingFamily{Key: string(family), Name: strings.ToUpper(string(family[:1])) + string(family[1:]), Bindings: rows})
	}
	visibleGroups := make([]string, 0, len(visibleGroupSet))
	for _, group := range groups {
		if _, ok := visibleGroupSet[group]; ok {
			visibleGroups = append(visibleGroups, group)
		}
	}
	c.JSON(http.StatusOK, gin.H{"success": true, "message": "", "data": gin.H{"groups": visibleGroups, "families": families}})
}

func SetUserVideoChannelBindings(c *gin.Context) {
	userID, err := strconv.Atoi(c.Param("id"))
	if err != nil || userID <= 0 {
		common.ApiErrorMsg(c, "invalid user id")
		return
	}
	if _, err = model.GetUserById(userID, false); err != nil {
		common.ApiError(c, err)
		return
	}
	var request adminVideoChannelBindingRequest
	if err := c.ShouldBindJSON(&request); err != nil {
		common.ApiErrorMsg(c, err.Error())
		return
	}
	groups, err := model.GetUserConcreteTokenGroups(userID)
	if err != nil {
		common.ApiError(c, err)
		return
	}
	allowedGroups := make(map[string]struct{}, len(groups))
	for _, group := range groups {
		allowedGroups[group] = struct{}{}
	}
	requested := make(map[string]validatedAdminVideoChannelBinding, len(request.Bindings))
	for _, binding := range request.Bindings {
		binding.Group = strings.TrimSpace(binding.Group)
		family, ok := videoAssetFamilyFromString(binding.Family)
		if !ok || binding.Group == "" || binding.Group == "auto" || binding.ChannelID <= 0 {
			common.ApiErrorMsg(c, "invalid video channel binding")
			return
		}
		if _, ok := allowedGroups[binding.Group]; !ok {
			common.ApiErrorMsg(c, "token group is not available for this user")
			return
		}
		key := binding.Group + "\x00" + string(family)
		if _, exists := requested[key]; exists {
			common.ApiErrorMsg(c, "duplicate video channel binding")
			return
		}
		candidates, err := service.GetVideoAssetChannelCandidates(binding.Group, family)
		if err != nil {
			common.ApiError(c, err)
			return
		}
		channelType := 0
		for _, candidate := range candidates {
			if candidate.Id == binding.ChannelID {
				channelType = candidate.Type
				break
			}
		}
		if channelType == 0 {
			common.ApiErrorMsg(c, "channel is not available for this video family and token group")
			return
		}
		binding.Family = string(family)
		requested[key] = validatedAdminVideoChannelBinding{AdminVideoChannelBinding: binding, ChannelType: channelType}
	}
	if err := model.DB.Transaction(func(tx *gorm.DB) error {
		for _, group := range groups {
			for _, family := range service.VideoAssetFamilies() {
				key := group + "\x00" + string(family)
				binding, exists := requested[key]
				channelTypes := service.VideoAssetChannelTypesForFamily(family)
				if err := model.DeleteUserAssetChannelsByTypesWithTx(tx, userID, channelTypes, group); err != nil {
					return err
				}
				if !exists {
					continue
				}
				if err := model.BindUserAssetChannelWithTx(tx, userID, binding.ChannelType, group, binding.ChannelID); err != nil {
					return err
				}
			}
		}
		return nil
	}); err != nil {
		common.ApiError(c, err)
		return
	}
	model.RecordLog(userID, model.LogTypeManage, fmt.Sprintf("updated video channel bindings for user %d", userID))
	c.JSON(http.StatusOK, gin.H{"success": true, "message": ""})
}