package paymentguideser

import (
	"context"
	"fmt"
	"strings"
	"time"

	"91porn-server/models/cache/sysconfdata"
	"91porn-server/models/v/paymentguidemod"

	"go.mongodb.org/mongo-driver/bson/primitive"
)

type ListReq struct {
	Scene      string `form:"scene"`
	PageNumber int64  `form:"pageNumber,default=1" binding:"min=1"`
	PageSize   int64  `form:"pageSize,default=20" binding:"min=1,max=100"`
}

type ListResp struct {
	Total        int64                          `json:"total"`
	HasNext      bool                           `json:"hasNext"`
	List         []paymentguidemod.PaymentGuide `json:"list"`
	SceneOptions []SceneOption                  `json:"sceneOptions"`
}

type SceneOption struct {
	Label           string  `json:"label"`
	Value           string  `json:"value"`
	TotalWatchCount *uint64 `json:"totalWatchCount,omitempty"`
}

// AddReq keeps the existing flat single-scene request compatible and adds an
// optional batch envelope for applying one configuration to multiple scenes.
type AddReq struct {
	paymentguidemod.PaymentGuide
	Scenes []string                      `json:"scenes,omitempty"`
	Config *paymentguidemod.PaymentGuide `json:"config,omitempty"`
}

type BatchAddReq struct {
	Scenes []string                     `json:"scenes"`
	Config paymentguidemod.PaymentGuide `json:"config"`
}

type BatchAddItem struct {
	Scene string `json:"scene"`
	ID    string `json:"id"`
}

type BatchAddResp struct {
	List []BatchAddItem `json:"list"`
}

func (p AddReq) IsBatch() bool {
	return p.Config != nil || p.Scenes != nil
}

func (p *ListReq) List() (ListResp, error) {
	p.Scene = strings.ToUpper(strings.TrimSpace(p.Scene))
	if p.Scene != "" && !paymentguidemod.ConfigurableScene(p.Scene) {
		return ListResp{}, fmt.Errorf("unsupported scene: %s", p.Scene)
	}
	list, total, hasNext, err := paymentguidemod.List(
		p.Scene,
		(p.PageNumber-1)*p.PageSize,
		p.PageSize,
	)
	if list == nil {
		list = []paymentguidemod.PaymentGuide{}
	}
	normalizeVideoLimits(list)
	return ListResp{
		Total:        total,
		HasNext:      hasNext,
		List:         list,
		SceneOptions: sceneOptions(sysconfdata.GetTotalWatchCount()),
	}, err
}

func sceneOptions(totalWatchCount uint64) []SceneOption {
	return []SceneOption{
		{Label: fmt.Sprintf("首页新用户免费%d次试看", totalWatchCount), Value: paymentguidemod.SceneHomeNewUserFreeTrial, TotalWatchCount: &totalWatchCount},
		{Label: "首页老用户", Value: paymentguidemod.SceneHomeOldUser},
		{Label: "视频试看3秒", Value: paymentguidemod.SceneVideoPreviewEnd},
		{Label: "优惠倒计时", Value: paymentguidemod.SceneDiscountCountdown},
		{Label: "视频返回", Value: paymentguidemod.SceneVideoBack},
		{Label: "VIP中心", Value: paymentguidemod.SceneVIPCenter},
		{Label: "VIP内容更新", Value: paymentguidemod.SceneVIPContentUpdate},
	}
}

func normalizeVideoLimits(list []paymentguidemod.PaymentGuide) {
	for i := range list {
		if list[i].Scene == paymentguidemod.SceneVIPContentUpdate {
			list[i].VideoLimit = list[i].EffectiveVideoLimit()
		}
	}
}

func Add(config *paymentguidemod.PaymentGuide) error {
	config.Normalize()
	if !paymentguidemod.ConfigurableScene(config.Scene) {
		return fmt.Errorf("unsupported scene: %s", config.Scene)
	}
	return paymentguidemod.Insert(config)
}

func (p BatchAddReq) Configs() ([]paymentguidemod.PaymentGuide, error) {
	if len(p.Scenes) == 0 {
		return nil, fmt.Errorf("scenes are required")
	}
	if len(p.Scenes) > paymentguidemod.MaxBatchSceneCount {
		return nil, fmt.Errorf("scenes cannot contain more than %d entries", paymentguidemod.MaxBatchSceneCount)
	}
	seen := make(map[string]struct{}, len(p.Scenes))
	configs := make([]paymentguidemod.PaymentGuide, 0, len(p.Scenes))
	for _, rawScene := range p.Scenes {
		scene := strings.ToUpper(strings.TrimSpace(rawScene))
		if !paymentguidemod.ConfigurableScene(scene) {
			return nil, fmt.Errorf("unsupported scene: %s", scene)
		}
		if _, ok := seen[scene]; ok {
			return nil, fmt.Errorf("duplicate scene: %s", scene)
		}
		seen[scene] = struct{}{}
		config := p.Config
		config.ID = primitive.NilObjectID
		config.Scene = scene
		config.Segments = append([]string(nil), p.Config.Segments...)
		config.VideoIDs = append([]string(nil), p.Config.VideoIDs...)
		if config.VideoLimit == 0 {
			config.VideoLimit = paymentguidemod.DefaultVIPContentVideoLimit
		}
		config.CreatedAt = time.Time{}
		config.UpdatedAt = time.Time{}
		config.Normalize()
		if err := config.Validate(); err != nil {
			return nil, fmt.Errorf("scene %s: %w", scene, err)
		}
		configs = append(configs, config)
	}
	return configs, nil
}

func BatchAdd(ctx context.Context, configs []paymentguidemod.PaymentGuide) (BatchAddResp, error) {
	if err := paymentguidemod.InsertMany(ctx, configs); err != nil {
		return BatchAddResp{}, err
	}
	items := make([]BatchAddItem, 0, len(configs))
	for i := range configs {
		items = append(items, BatchAddItem{Scene: configs[i].Scene, ID: configs[i].ID.Hex()})
	}
	return BatchAddResp{List: items}, nil
}

func Edit(config *paymentguidemod.PaymentGuide) error {
	config.Normalize()
	if !paymentguidemod.ConfigurableScene(config.Scene) {
		return fmt.Errorf("unsupported scene: %s", config.Scene)
	}
	return paymentguidemod.Update(config)
}

func Delete(id primitive.ObjectID) error {
	return paymentguidemod.Delete(id)
}