package model

import (
	"one-api/common"
	"strings"
)

type Ability struct {
	Group     string `json:"group" gorm:"type:varchar(64);primaryKey;autoIncrement:false"`
	Model     string `json:"model" gorm:"type:varchar(64);primaryKey;autoIncrement:false"`
	ChannelId int    `json:"channel_id" gorm:"primaryKey;autoIncrement:false;index"`
	Enabled   bool   `json:"enabled"`
	Priority  *int64 `json:"priority" gorm:"bigint;default:0;index"`
	Weight    uint   `json:"weight" gorm:"default:0;index"`
}

func GetGroupModels(group string) []string {
	var models []string
	// Find distinct models
	groupCol := "`group`"
	if common.UsingPostgreSQL {
		groupCol = `"group"`
	}
	DB.Table("abilities").Where(groupCol+" = ? and enabled = ?", group, true).Distinct("model").Pluck("model", &models)
	return models
}

func GetRandomSatisfiedChannel(group string, model string) (*Channel, error) {
	var abilities []Ability
	groupCol := "`group`"
	trueVal := "1"
	if common.UsingPostgreSQL {
		groupCol = `"group"`
		trueVal = "true"
	}

	var err error = nil
	maxPrioritySubQuery := DB.Model(&Ability{}).Select("MAX(priority)").Where(groupCol+" = ? and model = ? and enabled = "+trueVal, group, model)
	channelQuery := DB.Where(groupCol+" = ? and model = ? and enabled = "+trueVal+" and priority = (?)", group, model, maxPrioritySubQuery)
	if common.UsingSQLite || common.UsingPostgreSQL {
		err = channelQuery.Order("weight DESC").Find(&abilities).Error
	} else {
		err = channelQuery.Order("weight DESC").Find(&abilities).Error
	}
	if err != nil {
		return nil, err
	}
	channel := Channel{}
	if len(abilities) > 0 {
		// Randomly choose one
		weightSum := uint(0)
		for _, ability_ := range abilities {
			weightSum += ability_.Weight
		}
		if weightSum == 0 {
			// All weight is 0, randomly choose one
			channel.Id = abilities[common.GetRandomInt(len(abilities))].ChannelId
		} else {
			// Randomly choose one
			weight := common.GetRandomInt(int(weightSum))
			for _, ability_ := range abilities {
				weight -= int(ability_.Weight)
				//log.Printf("weight: %d, ability weight: %d", weight, *ability_.Weight)
				if weight <= 0 {
					channel.Id = ability_.ChannelId
					break
				}
			}
		}
	} else {
		return nil, nil
	}
	err = DB.First(&channel, "id = ?", channel.Id).Error
	return &channel, err
}

func (channel *Channel) AddAbilities() error {
	models_ := strings.Split(channel.Models, ",")
	groups_ := strings.Split(channel.Group, ",")
	abilities := make([]Ability, 0, len(models_))
	for _, model := range models_ {
		for _, group := range groups_ {
			ability := Ability{
				Group:     group,
				Model:     model,
				ChannelId: channel.Id,
				Enabled:   channel.Status == common.ChannelStatusEnabled,
				Priority:  channel.Priority,
				Weight:    uint(channel.GetWeight()),
			}
			abilities = append(abilities, ability)
		}
	}
	return DB.Create(&abilities).Error
}

func (channel *Channel) DeleteAbilities() error {
	return DB.Where("channel_id = ?", channel.Id).Delete(&Ability{}).Error
}

// UpdateAbilities updates abilities of this channel.
// Make sure the channel is completed before calling this function.
func (channel *Channel) UpdateAbilities() error {
	// A quick and dirty way to update abilities
	// First delete all abilities of this channel
	err := channel.DeleteAbilities()
	if err != nil {
		return err
	}
	// Then add new abilities
	err = channel.AddAbilities()
	if err != nil {
		return err
	}
	return nil
}

func UpdateAbilityStatus(channelId int, status bool) error {
	return DB.Model(&Ability{}).Where("channel_id = ?", channelId).Select("enabled").Update("enabled", status).Error
}