package app

import (
	"context"
	"encoding/json"
	"errors"
	"fmt"
	"net/http"
	"strconv"
	"strings"
	"time"

	"infinite-canvas/backend/internal/model"
	"infinite-canvas/backend/internal/protocol"
	"infinite-canvas/backend/internal/repository"

	"gorm.io/gorm"
)

type ChannelModelRequest struct {
	ModelKey                     string                         `json:"modelKey"`
	ProviderModelKey             string                         `json:"providerModelKey"`
	DisplayName                  string                         `json:"displayName"`
	ChannelLabel                 string                         `json:"channelLabel"`
	Tags                         []model.ChannelModelTag        `json:"tags"`
	Description                  string                         `json:"description"`
	Icon                         string                         `json:"icon"`
	Capability                   string                         `json:"capability"`
	Protocol                     string                         `json:"protocol"`
	BillingMode                  string                         `json:"billingMode"`
	UnitPriceMicrocredits        int64                          `json:"unitPriceMicrocredits"`
	InputTokenPriceMicrocredits  int64                          `json:"inputTokenPriceMicrocredits"`
	OutputTokenPriceMicrocredits int64                          `json:"outputTokenPriceMicrocredits"`
	CachedTokenPriceMicrocredits int64                          `json:"cachedTokenPriceMicrocredits"`
	PriceConfigured              bool                           `json:"priceConfigured"`
	Enabled                      *bool                          `json:"enabled"`
	CapabilityConfig             *ModelCapabilityConfig         `json:"capabilityConfig"`
	PriceTiers                   []ChannelModelPriceTierRequest `json:"priceTiers"`
}

const maxAdminChannelModelBatchDeleteCount = 100

// ChannelModelPriceTierRequest 是系统渠道内某个规格的上游 SKU 与结算价格。
// Resolution="*"、VideoSeconds=0 分别表示任意分辨率和任意时长。
type ChannelModelPriceTierRequest struct {
	CostPricing model.CreditCostPricing `json:"costPricing"`
	// Selector 是 SKU 的规范匹配条件。支持 operation、quality、size、vquality、videoSeconds、imageCount、videoGenerateAudio；
	// operation 可区分文生/图生/视频生，避免同一分辨率下错误复用价格。
	Selector                     map[string]string `json:"selector"`
	Resolution                   string            `json:"resolution"`
	VideoSeconds                 int               `json:"videoSeconds"`
	ProviderModelKey             string            `json:"providerModelKey"`
	BillingMode                  string            `json:"billingMode"`
	UnitPriceMicrocredits        int64             `json:"unitPriceMicrocredits"`
	InputTokenPriceMicrocredits  int64             `json:"inputTokenPriceMicrocredits"`
	OutputTokenPriceMicrocredits int64             `json:"outputTokenPriceMicrocredits"`
	CachedTokenPriceMicrocredits int64             `json:"cachedTokenPriceMicrocredits"`
	PriceConfigured              bool              `json:"priceConfigured"`
	Enabled                      *bool             `json:"enabled"`
}

// AdminChannelModelFetchResult 是管理员从上游拉目录后的汇总：models 为去重后的标识，added 为本次新建条数。
type AdminChannelModelFetchResult struct {
	Models []string `json:"models"`
	Added  int64    `json:"added"`
}

type AdminChannelModelImportRequest struct {
	Models []string `json:"models"`
}

type AdminChannelModelTestResult struct {
	DurationMs int64 `json:"durationMs"`
}

func (s *Service) EnsureSystemChannelModels() error {
	channels, err := s.repo.SystemChannels(true)
	if err != nil {
		return err
	}
	for index := range channels {
		items, err := s.repo.ChannelModels(channels[index].ID, true)
		if err != nil {
			return err
		}
		if len(items) == 0 {
			if err := s.syncInitialChannelModels(&channels[index], channelModelNames(channels[index])); err != nil {
				return err
			}
		}
	}
	return nil
}

func (s *Service) AdminChannelModels(actor *model.User, channelID string) ([]model.ChannelModel, error) {
	if err := s.RequireAdmin(actor); err != nil {
		return nil, err
	}
	if _, err := s.adminSystemChannel(channelID); err != nil {
		return nil, err
	}
	items, err := s.ensureChannelModels(channelID, true)
	if err != nil {
		return nil, err
	}
	for index := range items {
		if strings.TrimSpace(items[index].CapabilityConfigJSON) == "" {
			continue
		}
		config, decodeErr := DecodeModelCapabilityConfig(items[index].CapabilityConfigJSON)
		if decodeErr != nil || config == nil {
			continue
		}
		normalized, normalizeErr := NormalizeModelCapabilityConfigForModel(items[index].Capability, string(items[index].Protocol), firstNonEmpty(items[index].ProviderModelKey, items[index].ModelKey), config)
		if normalizeErr != nil || normalized == nil {
			continue
		}
		encoded, encodeErr := json.Marshal(normalized)
		var value map[string]any
		if encodeErr == nil && json.Unmarshal(encoded, &value) == nil {
			items[index].CapabilityConfig = value
		}
	}
	return items, nil
}

func (s *Service) SystemChannelModel(channelID string, modelKey string) (*model.ChannelModel, error) {
	return s.repo.ChannelModelByKey(channelID, strings.TrimPrefix(strings.TrimSpace(modelKey), "models/"))
}

// SystemChannelHasProtocol 用于没有携带 model 字段的轮询请求：先确认渠道确实配置了该协议，
// 再由 handler 按协议限定请求路径，避免用空模型绕过系统渠道授权。
func (s *Service) SystemChannelHasProtocol(channelID string, protocol model.ChannelInterfaceType) (bool, error) {
	items, err := s.repo.ChannelModels(channelID, false)
	if err != nil {
		return false, err
	}
	for _, item := range items {
		if item.Protocol == protocol {
			return true, nil
		}
	}
	return false, nil
}

func (s *Service) FetchAdminChannelModels(ctx context.Context, actor *model.User, channelID string) (*AdminChannelModelFetchResult, error) {
	if err := s.RequireAdmin(actor); err != nil {
		return nil, err
	}
	channel, err := s.adminSystemChannel(channelID)
	if err != nil {
		return nil, err
	}
	headers, err := ParseOutboundHeadersJSON(channel.HeadersJSON)
	if err != nil {
		return nil, err
	}
	// 使用服务端保存的渠道密钥和请求头访问上游，避免敏感配置再次经过浏览器。
	models, err := s.FetchChannelModels(ctx, actor, ChannelModelsRequest{BaseURL: channel.BaseURL, APIKey: channel.APIKey, APIFormat: channel.APIFormat, Headers: headers})
	if err != nil {
		return nil, err
	}
	// 只按当前未删除记录去重；普通手动删除的模型仍可重新拉取，已合并进模型家族的 SKU 除外。
	existing, err := s.repo.ChannelModels(channelID, true)
	if err != nil {
		return nil, err
	}
	known := make(map[string]struct{}, len(existing))
	for _, item := range existing {
		known[channelModelCatalogKey(item.ModelKey)] = struct{}{}
	}
	retired := retiredChannelModelKeys(channel.RetiredModelsJSON)
	missing := make([]model.ChannelModel, 0, len(models))
	for _, name := range models {
		name = strings.TrimPrefix(strings.TrimSpace(name), "models/")
		key := channelModelCatalogKey(name)
		if _, ok := known[key]; ok || retired[key] {
			continue
		}
		// 自动发现不能绕过定价边界；新模型由管理员定价后再手动启用。
		modelID, idErr := s.repo.NextPrefixedID("MODEL")
		if idErr != nil {
			return nil, idErr
		}
		missing = append(missing, model.ChannelModel{ID: modelID, ChannelID: channelID, ModelKey: name, ProviderModelKey: name, DisplayName: name, BillingMode: "fixed_request", Enabled: false, PriceVersion: 1})
	}
	added, err := s.repo.CreateMissingChannelModels(missing)
	if err != nil {
		return nil, err
	}
	if added > 0 {
		s.invalidateRouteCatalog()
	}
	return &AdminChannelModelFetchResult{Models: models, Added: added}, nil
}

// PreviewAdminChannelModels 只读取上游模型目录，不修改渠道模型配置。
func (s *Service) PreviewAdminChannelModels(ctx context.Context, actor *model.User, channelID string) ([]string, error) {
	if err := s.RequireAdmin(actor); err != nil {
		return nil, err
	}
	return s.fetchAdminChannelModelCatalog(ctx, actor, channelID)
}

// ImportAdminChannelModels 只导入管理员明确选择、且仍存在于上游目录中的模型。
func (s *Service) ImportAdminChannelModels(ctx context.Context, actor *model.User, channelID string, selected []string) (*AdminChannelModelFetchResult, error) {
	if err := s.RequireAdmin(actor); err != nil {
		return nil, err
	}
	channel, err := s.adminSystemChannel(channelID)
	if err != nil {
		return nil, err
	}
	models, err := s.fetchAdminChannelModelCatalog(ctx, actor, channelID)
	if err != nil {
		return nil, err
	}
	if len(selected) == 0 {
		return nil, BadAuthRequest("请至少选择一个要导入的模型")
	}
	if len(selected) > 500 {
		return nil, BadAuthRequest("单次最多导入 500 个模型")
	}
	available := make(map[string]string, len(models))
	for _, name := range models {
		available[channelModelCatalogKey(name)] = name
	}
	chosen := make([]string, 0, len(selected))
	seen := make(map[string]struct{}, len(selected))
	for _, rawName := range selected {
		name := strings.TrimPrefix(strings.TrimSpace(rawName), "models/")
		key := channelModelCatalogKey(name)
		if key == "" {
			continue
		}
		canonical, ok := available[key]
		if !ok {
			return nil, BadAuthRequest("所选模型不在上游模型目录中：" + name)
		}
		if _, ok := seen[key]; ok {
			continue
		}
		seen[key] = struct{}{}
		chosen = append(chosen, canonical)
	}
	if len(chosen) == 0 {
		return nil, BadAuthRequest("请至少选择一个有效的模型")
	}

	existing, err := s.repo.ChannelModels(channelID, true)
	if err != nil {
		return nil, err
	}
	known := make(map[string]struct{}, len(existing))
	for _, item := range existing {
		providerKey := firstNonEmpty(item.ProviderModelKey, item.ModelKey)
		known[channelModelCatalogKey(providerKey)] = struct{}{}
	}
	retired := retiredChannelModelKeys(channel.RetiredModelsJSON)
	missing := make([]model.ChannelModel, 0, len(chosen))
	for _, name := range chosen {
		key := channelModelCatalogKey(name)
		if _, ok := known[key]; ok || retired[key] {
			continue
		}
		modelID, idErr := s.repo.NextPrefixedID("MODEL")
		if idErr != nil {
			return nil, idErr
		}
		missing = append(missing, model.ChannelModel{ID: modelID, ChannelID: channelID, ModelKey: name, DisplayName: name, BillingMode: "fixed_request", Enabled: false, PriceConfigured: false, PriceVersion: 1})
		known[key] = struct{}{}
	}
	added, err := s.repo.CreateMissingChannelModels(missing)
	if err != nil {
		return nil, err
	}
	if added > 0 {
		s.invalidateRouteCatalog()
	}
	return &AdminChannelModelFetchResult{Models: chosen, Added: added}, nil
}

func (s *Service) fetchAdminChannelModelCatalog(ctx context.Context, actor *model.User, channelID string) ([]string, error) {
	channel, err := s.adminSystemChannel(channelID)
	if err != nil {
		return nil, err
	}
	headers, err := ParseOutboundHeadersJSON(channel.HeadersJSON)
	if err != nil {
		return nil, err
	}
	models, err := s.FetchChannelModels(ctx, actor, ChannelModelsRequest{BaseURL: channel.BaseURL, APIKey: channel.APIKey, APIFormat: channel.APIFormat, Headers: headers})
	if err != nil {
		return nil, err
	}
	return uniqueNonEmpty(models), nil
}

func (s *Service) SaveAdminChannelModel(actor *model.User, channelID string, id string, req ChannelModelRequest) (*model.ChannelModel, error) {
	if err := s.RequireAdmin(actor); err != nil {
		return nil, err
	}
	channelLabel := strings.TrimSpace(req.ChannelLabel)
	tags, err := normalizeChannelModelTags(req.Tags)
	if err != nil {
		return nil, err
	}
	description := strings.TrimSpace(req.Description)
	if len([]rune(description)) > 500 {
		return nil, BadAuthRequest("模型描述不能超过 500 字")
	}
	if len([]rune(channelLabel)) > 80 {
		return nil, BadAuthRequest("渠道展示名不能超过 80 字")
	}
	channel, err := s.repo.AdminSystemChannel(channelID)
	if err != nil {
		return nil, err
	}
	modelKey, providerModelKey, capability, protocol, err := s.normalizeChannelModelContract(channel, req)
	if err != nil {
		return nil, err
	}
	// 先检查同渠道重复模型，避免无关能力校验或生成无用序列号掩盖真正的冲突。
	conflict, conflictErr := s.repo.ChannelModelByKeyIncludingDisabled(channelID, modelKey)
	if conflictErr != nil && !errors.Is(conflictErr, gorm.ErrRecordNotFound) {
		return nil, conflictErr
	}
	if conflict != nil && conflict.ID != strings.TrimSpace(id) {
		return nil, BadAuthRequest("该渠道已存在模型 " + modelKey + "，请直接编辑已有模型")
	}
	if capability == "text" || capability == "image" || capability == "video" {
		if _, err := NormalizeModelCapabilityConfigForModel(capability, string(protocol), providerModelKey, req.CapabilityConfig); err != nil {
			return nil, err
		}
	}
	tiers, err := s.normalizeChannelModelPriceTiers(req, capability, protocol, providerModelKey)
	if err != nil {
		return nil, err
	}
	modelID, err := s.repo.NextPrefixedID("MODEL")
	if err != nil {
		return nil, err
	}
	item := &model.ChannelModel{ID: modelID, ChannelID: channelID, Enabled: true, PriceVersion: 1}
	previousProviderModelKey := ""
	if id != "" {
		item, err = s.repo.ChannelModelByID(channelID, id)
		if err != nil {
			return nil, err
		}
		previousProviderModelKey = strings.TrimPrefix(strings.TrimSpace(item.ProviderModelKey), "models/")
		item.PriceVersion++
	}
	// 模型级上游键重命名时，与旧值相同的档位键属于“跟随模型默认”的隐式固化，必须级联跟随；
	// 否则任务请求会继续把旧上游键发给供应商。管理员显式配置的其他上游 SKU 不受影响。
	if previousProviderModelKey != "" && providerModelKey != previousProviderModelKey {
		for index := range tiers {
			if strings.TrimPrefix(strings.TrimSpace(tiers[index].ProviderModelKey), "models/") == previousProviderModelKey {
				tiers[index].ProviderModelKey = providerModelKey
			}
		}
	}
	item.ModelKey = modelKey
	item.ProviderModelKey = providerModelKey
	item.DisplayName = strings.TrimSpace(req.DisplayName)
	item.ChannelLabel = channelLabel
	item.Tags = tags
	item.Description = description
	if item.DisplayName == "" {
		item.DisplayName = modelKey
	}
	item.Icon = strings.TrimSpace(req.Icon)
	item.Capability = capability
	item.Protocol = protocol
	s.applyChannelModelPriceTierSummary(item, tiers)
	if capability == "text" || capability == "image" || capability == "video" {
		capabilityConfig, normalizeErr := NormalizeModelCapabilityConfigForModel(capability, string(protocol), providerModelKey, req.CapabilityConfig)
		if normalizeErr != nil {
			return nil, normalizeErr
		}
		encoded, encodeErr := json.Marshal(capabilityConfig)
		if encodeErr != nil {
			return nil, encodeErr
		}
		if item.CapabilityConfigJSON != string(encoded) {
			item.CapabilityVersion++
		}
		item.CapabilityConfigJSON = string(encoded)
	} else {
		item.CapabilityConfigJSON = ""
		item.CapabilityVersion = 0
	}
	if req.Enabled != nil {
		item.Enabled = *req.Enabled
	}
	if err := validateChannelModelTierCapabilities(tiers, item.CapabilityConfigJSON, capability); err != nil {
		return nil, err
	}
	// 渠道模型及所有价格档必须同时落库，不能出现“能力已开放但规格价格尚未更新”的窗口。
	if err := s.repo.SaveChannelModelWithPriceTiers(item, tiers); err != nil {
		return nil, err
	}
	item.PriceTiers = tiers
	s.invalidateRouteCatalog()
	if err := s.syncChannelModelNames(channel); err != nil {
		return nil, err
	}
	if err := s.syncLogicalModelsFromChannelModel(actor, item); err != nil {
		return nil, err
	}
	return item, nil
}

func validateChannelModelTierCapabilities(tiers []model.ChannelModelPriceTier, rawCapabilityConfig string, capability string) error {
	if capability != "video" {
		return nil
	}
	config, err := DecodeModelCapabilityConfig(rawCapabilityConfig)
	if err != nil || config == nil || config.Video == nil {
		return BadAuthRequest("视频模型能力配置无效，无法校验价格档规格")
	}
	resolutionSupported := make(map[string]bool, len(config.Video.Resolutions))
	for _, resolution := range config.Video.Resolutions {
		resolutionSupported[normalizeChannelModelTierResolution(resolution)] = true
	}
	durationSupported := make(map[int]bool, len(config.Video.Duration.Values))
	for _, seconds := range config.Video.Duration.Values {
		durationSupported[seconds] = true
	}
	for _, tier := range tiers {
		if tier.Resolution != "*" && !resolutionSupported[normalizeChannelModelTierResolution(tier.Resolution)] {
			return BadAuthRequest("价格档分辨率不在该视频模型支持范围内：" + tier.Resolution)
		}
		if tier.VideoSeconds == 0 {
			continue
		}
		if !videoDurationSupported(config.Video) {
			continue
		}
		if config.Video.Duration.Selection == "enum" && !durationSupported[tier.VideoSeconds] {
			return BadAuthRequest(fmt.Sprintf("价格档时长 %d 秒不在该视频模型支持范围内", tier.VideoSeconds))
		}
		if config.Video.Duration.Selection == "range" && (tier.VideoSeconds < config.Video.Duration.Min || tier.VideoSeconds > config.Video.Duration.Max || (config.Video.Duration.Step > 0 && (tier.VideoSeconds-config.Video.Duration.Min)%config.Video.Duration.Step != 0)) {
			return BadAuthRequest(fmt.Sprintf("价格档时长 %d 秒不在该视频模型支持范围内", tier.VideoSeconds))
		}
	}
	return nil
}

// syncLogicalModelsFromChannelModel 只失效路由目录。系统渠道 SKU 与前台模型目录
// 分别维护：保存渠道模型绝不能自动创建、覆盖或删除前台模型及其线路配置。
func (s *Service) syncLogicalModelsFromChannelModel(actor *model.User, channelModel *model.ChannelModel) error {
	_ = actor
	_ = channelModel
	s.invalidateRouteCatalog()
	return nil
}

func supportsTokenBilling(capability string, _ model.ChannelInterfaceType) bool {
	return capability == "text" || capability == "video"
}

func (s *Service) normalizeChannelModelPriceTiers(req ChannelModelRequest, capability string, protocol model.ChannelInterfaceType, fallbackProviderModelKey string) ([]model.ChannelModelPriceTier, error) {
	inputs := req.PriceTiers
	// 兼容旧管理 API：没有 priceTiers 的请求等价于一个默认价格档。
	if len(inputs) == 0 {
		enabled := true
		inputs = []ChannelModelPriceTierRequest{{
			Resolution: "*", VideoSeconds: 0, ProviderModelKey: fallbackProviderModelKey,
			BillingMode: req.BillingMode, UnitPriceMicrocredits: req.UnitPriceMicrocredits,
			InputTokenPriceMicrocredits: req.InputTokenPriceMicrocredits, OutputTokenPriceMicrocredits: req.OutputTokenPriceMicrocredits,
			CachedTokenPriceMicrocredits: req.CachedTokenPriceMicrocredits, PriceConfigured: req.PriceConfigured, Enabled: &enabled,
		}}
	}
	result := make([]model.ChannelModelPriceTier, 0, len(inputs))
	seen := make(map[string]bool, len(inputs))
	for _, input := range inputs {
		selector, resolution, videoSeconds, selectorErr := normalizeChannelModelTierSelector(capability, input)
		if selectorErr != nil {
			return nil, selectorErr
		}
		_, key, keyErr := model.CanonicalSKUSelector(selector)
		if keyErr != nil {
			return nil, keyErr
		}
		if seen[key] {
			return nil, BadAuthRequest("同一个操作和规格组合只能配置一个价格档")
		}
		seen[key] = true
		billingMode := strings.TrimSpace(input.BillingMode)
		if billingMode == "" {
			billingMode = "fixed_request"
		}
		if err := validateChannelModelTierPricing(capability, protocol, billingMode, input); err != nil {
			return nil, err
		}
		id, idErr := s.repo.NextPrefixedID("PTIER")
		if idErr != nil {
			return nil, idErr
		}
		enabled := input.Enabled == nil || *input.Enabled
		result = append(result, model.ChannelModelPriceTier{
			CostPricing:                  input.CostPricing,
			ID:                           id,
			SelectorKey:                  key,
			SelectorJSON:                 key,
			Selector:                     selector,
			Resolution:                   resolution,
			VideoSeconds:                 videoSeconds,
			ProviderModelKey:             strings.TrimPrefix(strings.TrimSpace(firstNonEmpty(input.ProviderModelKey, fallbackProviderModelKey)), "models/"),
			BillingMode:                  billingMode,
			UnitPriceMicrocredits:        input.UnitPriceMicrocredits,
			InputTokenPriceMicrocredits:  input.InputTokenPriceMicrocredits,
			OutputTokenPriceMicrocredits: input.OutputTokenPriceMicrocredits,
			CachedTokenPriceMicrocredits: input.CachedTokenPriceMicrocredits,
			PriceConfigured:              input.PriceConfigured,
			Enabled:                      enabled,
			PriceVersion:                 1,
		})
	}
	return result, nil
}

func normalizeChannelModelTierSelector(capability string, input ChannelModelPriceTierRequest) (map[string]string, string, int, error) {
	selector := make(map[string]string, len(input.Selector)+3)
	for rawKey, rawValue := range input.Selector {
		key := strings.TrimSpace(rawKey)
		value := strings.TrimSpace(rawValue)
		if key == "" || value == "" {
			continue
		}
		switch key {
		case "operation":
			value = strings.ToLower(value)
		case "quality", "size":
			value = strings.ToLower(value)
			if value == "auto" || value == "any" {
				value = "*"
			}
		case "vquality":
			value = normalizeChannelModelTierResolution(value)
		case "videoSeconds":
			seconds, err := strconv.Atoi(value)
			if err != nil || seconds < 0 {
				return nil, "", 0, BadAuthRequest("视频价格档时长必须是非负整数")
			}
			if seconds == 0 {
				continue
			}
			value = strconv.Itoa(seconds)
		case "imageCount":
			count, err := strconv.Atoi(value)
			if err != nil || count < 0 {
				return nil, "", 0, BadAuthRequest("参考图片数量必须是非负整数")
			}
			if count == 0 {
				continue
			}
			value = strconv.Itoa(count)
		case "videoGenerateAudio":
			if capability != "video" {
				return nil, "", 0, BadAuthRequest("只有视频模型可以按是否生成音频配置价格档")
			}
			value = strings.ToLower(value)
			if value == "*" {
				continue
			}
			if value != "true" && value != "false" {
				return nil, "", 0, BadAuthRequest("视频价格档音频条件必须为 true、false 或 *")
			}
		default:
			return nil, "", 0, BadAuthRequest("价格档不支持规格字段：" + key)
		}
		selector[key] = value
	}
	if capability == "video" {
		if _, exists := selector["vquality"]; !exists {
			if resolution := normalizeChannelModelTierResolution(input.Resolution); resolution != "*" {
				selector["vquality"] = resolution
			}
		}
		if _, exists := selector["videoSeconds"]; !exists && input.VideoSeconds > 0 {
			selector["videoSeconds"] = strconv.Itoa(input.VideoSeconds)
		}
	} else if input.Resolution != "" && normalizeChannelModelTierResolution(input.Resolution) != "*" {
		return nil, "", 0, BadAuthRequest("非视频模型不能使用视频分辨率价格档")
	} else if input.VideoSeconds != 0 {
		return nil, "", 0, BadAuthRequest("非视频模型不能使用视频时长价格档")
	}
	for _, key := range []string{"quality", "size"} {
		if _, exists := selector[key]; exists && capability != "image" {
			return nil, "", 0, BadAuthRequest("只有图片模型可以按 " + key + " 配置价格档")
		}
	}
	if _, exists := selector["vquality"]; exists && capability != "video" {
		return nil, "", 0, BadAuthRequest("只有视频模型可以按分辨率配置价格档")
	}
	if _, exists := selector["videoSeconds"]; exists && capability != "video" {
		return nil, "", 0, BadAuthRequest("只有视频模型可以按时长配置价格档")
	}
	if _, exists := selector["imageCount"]; exists && capability != "video" {
		return nil, "", 0, BadAuthRequest("只有视频模型可以按参考图片数量配置价格档")
	}
	resolution := "*"
	if value := selector["vquality"]; value != "" {
		resolution = value
	}
	videoSeconds := 0
	if value := selector["videoSeconds"]; value != "" {
		videoSeconds, _ = strconv.Atoi(value)
	}
	return selector, resolution, videoSeconds, nil
}

func validateChannelModelTierPricing(capability string, protocol model.ChannelInterfaceType, billingMode string, input ChannelModelPriceTierRequest) error {
	if err := validateCreditCostPricing(capability, billingMode, input.CostPricing); err != nil {
		return err
	}
	if billingMode != "fixed_request" && billingMode != "per_second" && billingMode != "token" {
		return BadAuthRequest("模型计费方式仅支持按次、按秒或 Token")
	}
	if billingMode == "per_second" && capability != "video" {
		return BadAuthRequest("只有视频模型可以按秒计费")
	}
	if billingMode == "token" && !supportsTokenBilling(capability, protocol) {
		return BadAuthRequest("Token 计费仅支持文本和视频模型")
	}
	if input.UnitPriceMicrocredits < 0 || input.InputTokenPriceMicrocredits < 0 || input.OutputTokenPriceMicrocredits < 0 || input.CachedTokenPriceMicrocredits < 0 {
		return BadAuthRequest("模型积分价格不能小于 0")
	}
	if billingMode == "token" {
		return validateTokenPrices(capability, input.InputTokenPriceMicrocredits, input.OutputTokenPriceMicrocredits, input.CachedTokenPriceMicrocredits)
	}
	return validateTokenPrices("", input.InputTokenPriceMicrocredits, input.OutputTokenPriceMicrocredits, input.CachedTokenPriceMicrocredits)
}

func normalizeChannelModelTierResolution(raw string) string {
	value := strings.TrimSpace(raw)
	if value == "" || value == "*" || strings.EqualFold(value, "any") {
		return "*"
	}
	normalized := normalizeModelRequestOption("vquality", value)
	return strings.ToLower(strings.TrimSpace(fmt.Sprint(normalized)))
}

func (s *Service) applyChannelModelPriceTierSummary(item *model.ChannelModel, tiers []model.ChannelModelPriceTier) {
	item.PriceConfigured = false
	item.BillingMode = "fixed_request"
	item.UnitPriceMicrocredits = 0
	item.InputTokenPriceMicrocredits = 0
	item.OutputTokenPriceMicrocredits = 0
	item.CachedTokenPriceMicrocredits = 0
	var summary *model.ChannelModelPriceTier
	for index := range tiers {
		tier := &tiers[index]
		if tier.Enabled && tier.PriceConfigured {
			item.PriceConfigured = true
		}
		if summary == nil || (tier.Resolution == "*" && tier.VideoSeconds == 0) {
			summary = tier
		}
	}
	if summary == nil {
		return
	}
	item.BillingMode = summary.BillingMode
	item.UnitPriceMicrocredits = summary.UnitPriceMicrocredits
	item.InputTokenPriceMicrocredits = summary.InputTokenPriceMicrocredits
	item.OutputTokenPriceMicrocredits = summary.OutputTokenPriceMicrocredits
	item.CachedTokenPriceMicrocredits = summary.CachedTokenPriceMicrocredits
}

func (s *Service) TestAdminChannelModel(ctx context.Context, actor *model.User, channelID string, req ChannelModelRequest) (*AdminChannelModelTestResult, error) {
	if err := s.RequireAdmin(actor); err != nil {
		return nil, err
	}
	channel, err := s.adminSystemChannel(channelID)
	if err != nil {
		return nil, err
	}
	modelKey, providerModelKey, capability, protocol, err := s.normalizeChannelModelContract(channel, req)
	if err != nil {
		return nil, err
	}
	if capability == "text" || capability == "image" || capability == "video" {
		if _, err := NormalizeModelCapabilityConfigForModel(capability, string(protocol), providerModelKey, req.CapabilityConfig); err != nil {
			return nil, err
		}
	}
	if strings.TrimSpace(channel.BaseURL) == "" || strings.TrimSpace(channel.APIKey) == "" {
		return nil, BadAuthRequest("请先在渠道中配置 Base URL 和 API Key")
	}
	if _, err := ValidateOutboundURL(channel.BaseURL); err != nil {
		return nil, err
	}
	headers, err := ParseOutboundHeadersJSON(channel.HeadersJSON)
	if err != nil {
		return nil, err
	}

	prompt := map[string]string{
		"text":  "Reply with OK.",
		"image": "A simple gray circle on a white background.",
		"video": "A static gray circle on a white background.",
		"audio": "Model test.",
	}[capability]
	videoSeconds := "6"
	videoSecondsValue := 6
	if protocol == model.ChannelInterfaceVolcengineJiMengVideo {
		videoSeconds = "5"
		videoSecondsValue = 5
	}
	imageSize, imageQuality := "", ""
	var imageProfile *ImageCapabilityConfig
	videoRatio, videoResolution := videoTestDefaults(nil)
	var videoProfile *VideoCapabilityConfig
	switch capability {
	case "image":
		profile, normalizeErr := NormalizeModelCapabilityConfigForModel(capability, string(protocol), providerModelKey, req.CapabilityConfig)
		if normalizeErr != nil {
			return nil, normalizeErr
		}
		imageProfile = profile.Image
		imageSize, imageQuality = imageTestDefaults(imageProfile)
	case "video":
		// 视频测试必须带上模型能力画像：声明式协议只按画像里的枚举回填分辨率名（如 480 -> 480p），
		// 没有画像时会把裸数字发给上游，火山方舟等供应商会直接拒绝。
		profile, normalizeErr := NormalizeModelCapabilityConfigForModel(capability, string(protocol), providerModelKey, req.CapabilityConfig)
		if normalizeErr != nil {
			return nil, normalizeErr
		}
		videoProfile = profile.Video
		videoRatio, videoResolution = videoTestDefaults(videoProfile)
	}
	input := canvasGenerationInput{
		Mode:   capability,
		Prompt: prompt,
		Config: providerConfig{
			ChannelID:          channel.ID,
			APIFormat:          channel.APIFormat,
			InterfaceType:      string(protocol),
			BaseURL:            channel.BaseURL,
			APIKey:             channel.APIKey,
			SecretKey:          channel.SecretKey,
			Headers:            headers,
			Model:              providerModelKey,
			ChannelModelKey:    modelKey,
			Size:               map[string]string{"image": imageSize, "video": videoRatio}[capability],
			Quality:            imageQuality,
			Count:              "1",
			VideoSeconds:       videoSeconds,
			VQuality:           videoResolution,
			VideoGenerateAudio: "false",
			VideoWatermark:     "false",
			AudioVoice:         "alloy",
			AudioFormat:        "mp3",
			AudioSpeed:         "1",
		},
		Metadata: map[string]interface{}{},
	}
	if capability == "image" {
		input.ImageCapability = imageProfile
	}
	if capability == "video" {
		input.VideoCapability = videoProfile
	}

	// 测试复用真实生成协议、运行时并发和熔断策略，但不创建用户任务或计费订单。
	testCtx, cancel := context.WithTimeout(ctx, 10*time.Minute)
	defer cancel()
	testCtx = context.WithValue(testCtx, providerAnalyticsKey{}, providerAnalyticsContext{
		Service: s, Billing: s.taskBilling(), UserID: actor.ID, ChannelID: channel.ID, Capability: capability,
		Operation: "admin_model_test", Model: modelKey, VideoSeconds: videoSecondsValue,
	})
	testCtx = withProtocolRegistry(testCtx, s.protocolRegistry())
	startedAt := time.Now()
	switch capability {
	case "text":
		_, err = runTextTask(testCtx, input)
	case "image":
		_, err = runImageTask(testCtx, input)
	case "video":
		_, err = runVideoTask(testCtx, input)
	case "audio":
		_, err = runAudioTask(testCtx, input)
	}
	if err != nil {
		status := http.StatusBadGateway
		if errors.Is(err, context.DeadlineExceeded) {
			status = http.StatusGatewayTimeout
		}
		return nil, WrapAppError(status, "模型测试失败："+providerUserFacingErrorMessage(err), err)
	}
	return &AdminChannelModelTestResult{DurationMs: time.Since(startedAt).Milliseconds()}, nil
}

// 模型测试必须使用当前模型声明的默认参数，避免固定分辨率 SKU 被通用 1K 测试值误伤。
// videoTestDefaults 从模型能力画像取测试用的比例和分辨率；画像缺失时回退到最通用的 16:9 / 720。
func videoTestDefaults(profile *VideoCapabilityConfig) (string, string) {
	if profile == nil {
		return "16:9", "720"
	}
	ratio := strings.TrimSpace(profile.DefaultRatio)
	if ratio == "" && len(profile.Ratios) > 0 {
		ratio = strings.TrimSpace(profile.Ratios[0])
	}
	if ratio == "" {
		ratio = "16:9"
	}
	resolution := strings.TrimSpace(profile.DefaultResolution)
	if resolution == "" && len(profile.Resolutions) > 0 {
		resolution = strings.TrimSpace(profile.Resolutions[0])
	}
	if resolution == "" {
		resolution = "720"
	}
	return ratio, resolution
}

func imageTestDefaults(profile *ImageCapabilityConfig) (string, string) {
	if profile == nil {
		return "1024x1024", "auto"
	}
	size := ""
	if profile.Size.Parameter != "none" {
		size = strings.TrimSpace(profile.Size.Default)
	}
	quality := ""
	if profile.Quality.Supported {
		quality = strings.TrimSpace(profile.Quality.Default)
	}
	return size, quality
}

func normalizeChannelModelContract(channel *model.ModelChannel, req ChannelModelRequest) (string, string, string, model.ChannelInterfaceType, error) {
	return normalizeChannelModelContractWithRegistry(protocol.Builtins(), channel, req)
}

func (s *Service) normalizeChannelModelContract(channel *model.ModelChannel, req ChannelModelRequest) (string, string, string, model.ChannelInterfaceType, error) {
	return normalizeChannelModelContractWithRegistry(s.protocolRegistry(), channel, req)
}

func normalizeChannelModelContractWithRegistry(registry *protocol.Registry, channel *model.ModelChannel, req ChannelModelRequest) (string, string, string, model.ChannelInterfaceType, error) {
	modelKey := strings.TrimPrefix(strings.TrimSpace(req.ModelKey), "models/")
	if modelKey == "" {
		return "", "", "", "", BadAuthRequest("请填写模型标识")
	}
	providerModelKey := strings.TrimPrefix(strings.TrimSpace(req.ProviderModelKey), "models/")
	if providerModelKey == "" {
		providerModelKey = modelKey
	}
	capability := normalizeCapability(req.Capability)
	if capability == "" {
		return "", "", "", "", BadAuthRequest("请选择模型能力")
	}
	adapter, ok := registry.Resolve(strings.TrimSpace(req.Protocol))
	if !ok || !adapter.Metadata().Enabled || adapter.Metadata().UnavailableReason != "" {
		return "", "", "", "", BadAuthRequest("请选择有效的模型请求协议")
	}
	protocol := model.ChannelInterfaceType(adapter.Metadata().ID)
	if expected := protocolCapabilityFromMetadata(adapter.Metadata()); expected != "" && expected != capability {
		return "", "", "", "", BadAuthRequest("模型能力与请求协议不匹配")
	}
	if (protocol == model.ChannelInterfaceVolcengineJiMengImage || protocol == model.ChannelInterfaceVolcengineJiMengVideo) && (strings.TrimSpace(channel.APIKey) == "" || strings.TrimSpace(channel.SecretKey) == "") {
		return "", "", "", "", BadAuthRequest("即梦官方协议需要先在渠道中配置 Access Key 和 Secret Key")
	}
	return modelKey, providerModelKey, capability, protocol, nil
}

func (s *Service) DeleteAdminChannelModel(actor *model.User, channelID string, id string) error {
	_, err := s.DeleteAdminChannelModels(actor, channelID, []string{id})
	return err
}

// DeleteAdminChannelModels validates the complete selection before asking the
// repository to remove it atomically. This deliberately rejects partial success:
// administrators can safely correct an in-use model and retry the same selection.
func (s *Service) DeleteAdminChannelModels(actor *model.User, channelID string, ids []string) (int64, error) {
	if err := s.RequireAdmin(actor); err != nil {
		return 0, err
	}
	if _, err := s.repo.AdminSystemChannel(channelID); err != nil {
		if errors.Is(err, gorm.ErrRecordNotFound) {
			return 0, BadAuthRequest("系统渠道不存在或已删除")
		}
		return 0, err
	}
	modelIDs, err := normalizeAdminChannelModelDeleteIDs(ids)
	if err != nil {
		return 0, err
	}
	items, err := s.repo.ChannelModels(channelID, true)
	if err != nil {
		return 0, err
	}
	selected := make(map[string]bool, len(modelIDs))
	for _, id := range modelIDs {
		selected[id] = true
	}
	found := 0
	for _, item := range items {
		if selected[item.ID] {
			found++
		}
	}
	if found != len(modelIDs) {
		return 0, BadAuthRequest("所选渠道模型中存在已删除或不属于当前渠道的记录，请刷新后重试")
	}
	// 删除模型与渠道的兼容模型清单必须同事务提交，避免接口报错但列表已部分变化。
	deleted, err := s.repo.DeleteChannelModels(channelID, modelIDs, time.Now())
	if errors.Is(err, repository.ErrChannelModelInUse) {
		return 0, BadAuthRequest("所选渠道模型中有模型仍被前台模型供应线路或进行中任务使用，本次未删除任何模型")
	}
	if errors.Is(err, gorm.ErrRecordNotFound) {
		return 0, BadAuthRequest("所选渠道模型中存在已删除或不属于当前渠道的记录，请刷新后重试")
	}
	if err == nil {
		s.invalidateRouteCatalog()
	}
	return deleted, err
}

func normalizeAdminChannelModelDeleteIDs(values []string) ([]string, error) {
	result := make([]string, 0, len(values))
	seen := make(map[string]bool, len(values))
	for _, value := range values {
		id := strings.TrimSpace(value)
		if id == "" || seen[id] {
			continue
		}
		seen[id] = true
		result = append(result, id)
	}
	if len(result) == 0 {
		return nil, BadAuthRequest("请至少选择一个要删除的渠道模型")
	}
	if len(result) > maxAdminChannelModelBatchDeleteCount {
		return nil, BadAuthRequest("单次最多删除 100 个渠道模型")
	}
	return result, nil
}

func (s *Service) syncInitialChannelModels(channel *model.ModelChannel, names []string) error {
	existing, err := s.repo.ChannelModels(channel.ID, true)
	if err != nil {
		return err
	}
	byKey := make(map[string]*model.ChannelModel, len(existing))
	for index := range existing {
		byKey[existing[index].ModelKey] = &existing[index]
	}
	desired := make(map[string]bool, len(names))
	retired := retiredChannelModelKeys(channel.RetiredModelsJSON)
	for _, name := range uniqueNonEmpty(names) {
		name = strings.TrimPrefix(name, "models/")
		if retired[channelModelCatalogKey(name)] {
			continue
		}
		desired[name] = true
		if item := byKey[name]; item != nil {
			continue
		}
		modelID, idErr := s.repo.NextPrefixedID("MODEL")
		if idErr != nil {
			return idErr
		}
		item := model.ChannelModel{ID: modelID, ChannelID: channel.ID, ModelKey: name, DisplayName: name, BillingMode: "fixed_request", Enabled: false, PriceConfigured: false, UnitPriceMicrocredits: 0, PriceVersion: 1}
		if err := s.repo.SaveChannelModel(&item); err != nil {
			return err
		}
	}
	for index := range existing {
		if !desired[existing[index].ModelKey] {
			changed := existing[index].Enabled
			existing[index].Enabled = false
			if changed {
				existing[index].PriceVersion++
				if err := s.repo.SaveChannelModel(&existing[index]); err != nil {
					return err
				}
			}
		}
	}
	return nil
}

func retiredChannelModelKeys(raw string) map[string]bool {
	var values []string
	_ = json.Unmarshal([]byte(raw), &values)
	result := make(map[string]bool, len(values))
	for _, value := range values {
		if key := channelModelCatalogKey(value); key != "" {
			result[key] = true
		}
	}
	return result
}

func channelModelCatalogKey(value string) string {
	return strings.ToLower(strings.TrimPrefix(strings.TrimSpace(value), "models/"))
}

func (s *Service) ensureChannelModels(channelID string, includeDisabled bool) ([]model.ChannelModel, error) {
	items, err := s.repo.ChannelModels(channelID, includeDisabled)
	if err != nil || len(items) > 0 {
		return items, err
	}
	channel, err := s.repo.AdminSystemChannel(channelID)
	if err != nil {
		return nil, err
	}
	if err := s.syncInitialChannelModels(channel, channelModelNames(*channel)); err != nil {
		return nil, err
	}
	return s.repo.ChannelModels(channelID, includeDisabled)
}

func (s *Service) syncChannelModelNames(channel *model.ModelChannel) error {
	return s.repo.SyncChannelModelNames(channel.ID, time.Now())
}

func (s *Service) capabilityForProtocol(protocol model.ChannelInterfaceType) string {
	metadata, ok := s.channelProtocolMetadata(string(protocol))
	if !ok {
		return ""
	}
	return protocolCapabilityFromMetadata(metadata)
}

func protocolCapabilityFromMetadata(metadata protocol.Metadata) string {
	if len(metadata.Categories) == 0 {
		return ""
	}
	return string(metadata.Categories[0])
}