package plugin

import (
	"encoding/json"
	"net/http"
	"net/url"
	"time"
)

const (
	ABIVersion    uint32 = 1
	SchemaVersion uint32 = 3
	PluginName           = "billing"
	Version              = "0.1.0"
)

const (
	MethodPluginRegister       = "plugin.register"
	MethodPluginReconfigure    = "plugin.reconfigure"
	MethodPluginShutdown       = "plugin.shutdown"
	MethodRequestComplete      = "request.complete"
	MethodUsageHandle          = "usage.handle"
	MethodFrontendIdentifier   = "frontend_auth.identifier"
	MethodFrontendAuthenticate = "frontend_auth.authenticate"
	MethodSchedulerPick        = "scheduler.pick"
	MethodRequestBefore        = "request.intercept_before"
	MethodRequestAfter         = "request.intercept_after"
	MethodManagementRegister   = "management.register"
	MethodManagementHandle     = "management.handle"
)

type Envelope struct {
	OK     bool            `json:"ok"`
	Result json.RawMessage `json:"result,omitempty"`
	Error  *EnvelopeError  `json:"error,omitempty"`
}

type EnvelopeError struct {
	Code       string `json:"code"`
	Message    string `json:"message"`
	Retryable  bool   `json:"retryable,omitempty"`
	HTTPStatus int    `json:"http_status,omitempty"`
}

type LifecycleRequest struct {
	ConfigYAML    []byte `json:"config_yaml"`
	SchemaVersion uint32 `json:"schema_version"`
}

type Registration struct {
	SchemaVersion uint32       `json:"schema_version"`
	Metadata      Metadata     `json:"metadata"`
	Capabilities  Capabilities `json:"capabilities"`
}

type Metadata struct {
	Name             string
	Version          string
	Author           string
	GitHubRepository string
	Logo             string
	ConfigFields     []ConfigField
}

type ConfigField struct {
	Name        string
	Type        string
	EnumValues  []string
	Description string
}

type Capabilities struct {
	FrontendAuthProvider          bool `json:"frontend_auth_provider"`
	FrontendAuthProviderExclusive bool `json:"frontend_auth_provider_exclusive"`
	Scheduler                     bool `json:"scheduler"`
	RequestInterceptor            bool `json:"request_interceptor"`
	RequestLifecyclePlugin        bool `json:"request_lifecycle_plugin"`
	UsagePlugin                   bool `json:"usage_plugin"`
	ManagementAPI                 bool `json:"management_api"`
}

type FrontendIdentifierResponse struct {
	Identifier string `json:"identifier"`
}

type FrontendAuthRequest struct {
	Method  string
	Path    string
	Headers http.Header
	Query   url.Values
	Body    []byte
}

type FrontendAuthResponse struct {
	Authenticated bool
	Principal     string
	Metadata      map[string]string
}

type SchedulerPickRequest struct {
	Provider   string
	Providers  []string
	Model      string
	Stream     bool
	Options    SchedulerOptions
	Candidates []SchedulerAuthCandidate
}

type SchedulerOptions struct {
	Headers  map[string][]string
	Metadata map[string]any
}

type SchedulerAuthCandidate struct {
	ID         string
	Provider   string
	Priority   int
	Status     string
	Attributes map[string]string
	Metadata   map[string]any
}

type SchedulerPickResponse struct {
	AuthID          string
	DelegateBuiltin string
	Handled         bool
}

type RequestInterceptRequest struct {
	RequestID      string
	TraceID        string
	SourceFormat   string
	ToFormat       string
	Model          string
	RequestedModel string
	Stream         bool
	Headers        http.Header
	Body           []byte
	Metadata       map[string]any
}

type RequestInterceptResponse struct {
	Headers         http.Header
	Body            []byte
	ClearHeaders    []string
	Terminate       bool
	StatusCode      int
	ResponseHeaders http.Header
	ResponseBody    []byte
}

type HostAuthFileEntry struct {
	ID            string    `json:"id,omitempty"`
	AuthIndex     string    `json:"auth_index,omitempty"`
	Name          string    `json:"name"`
	Type          string    `json:"type,omitempty"`
	Provider      string    `json:"provider,omitempty"`
	Label         string    `json:"label,omitempty"`
	Status        string    `json:"status,omitempty"`
	StatusMessage string    `json:"status_message,omitempty"`
	Disabled      bool      `json:"disabled,omitempty"`
	Unavailable   bool      `json:"unavailable,omitempty"`
	Email         string    `json:"email,omitempty"`
	ProjectID     string    `json:"project_id,omitempty"`
	Account       string    `json:"account,omitempty"`
	Priority      int       `json:"priority,omitempty"`
	UpdatedAt     time.Time `json:"updated_at,omitempty"`
}

type RequestCompletionOutcome string

const (
	RequestCompletionSucceeded RequestCompletionOutcome = "succeeded"
	RequestCompletionFailed    RequestCompletionOutcome = "failed"
	RequestCompletionRejected  RequestCompletionOutcome = "rejected"
	RequestCompletionCanceled  RequestCompletionOutcome = "canceled"
)

// RequestCompletion 是一次模型执行的终态，Token 由 UsageRecord 单独补充。
type RequestCompletion struct {
	RequestID      string
	TraceID        string
	SourceFormat   string
	Model          string
	RequestedModel string
	Stream         bool
	Outcome        RequestCompletionOutcome
	StatusCode     int
	Error          string
	StartedAt      time.Time
	CompletedAt    time.Time
	Metadata       map[string]any
}

type ManagementRegistrationResponse struct {
	Routes    []ManagementRoute `json:"routes,omitempty"`
	Resources []ResourceRoute   `json:"resources,omitempty"`
}

type ManagementRoute struct {
	Method      string `json:"Method"`
	Path        string `json:"Path"`
	Description string `json:"Description,omitempty"`
}

type ResourceRoute struct {
	Path        string `json:"Path"`
	Menu        string `json:"Menu,omitempty"`
	Description string `json:"Description,omitempty"`
}

type ManagementRequest struct {
	Method  string      `json:"Method"`
	Path    string      `json:"Path"`
	Headers http.Header `json:"Headers"`
	Query   url.Values  `json:"Query"`
	Body    []byte      `json:"Body"`
}

type ManagementResponse struct {
	StatusCode int         `json:"StatusCode,omitempty"`
	Headers    http.Header `json:"Headers,omitempty"`
	Body       []byte      `json:"Body,omitempty"`
}

// UsageRecord mirrors CLIProxyAPI sdk/pluginapi. Keep it in sync with the
// target host because exported field names are part of the JSON wire contract.
type UsageRecord struct {
	Provider        string
	ExecutorType    string
	Model           string
	Alias           string
	APIKey          string
	AuthID          string
	AuthIndex       string
	AuthType        string
	Source          string
	ReasoningEffort string
	ServiceTier     string
	Generate        bool
	RequestedAt     time.Time
	Latency         time.Duration
	TTFT            time.Duration
	Failed          bool
	Failure         UsageFailure
	Detail          UsageDetail
	ResponseHeaders http.Header
}

type UsageFailure struct {
	StatusCode int
	Body       string
}

type UsageDetail struct {
	InputTokens         int64
	OutputTokens        int64
	ReasoningTokens     int64
	CachedTokens        int64
	CacheReadTokens     int64
	CacheCreationTokens int64
	TotalTokens         int64
}