package model

import (
	"context"
	"fmt"
	"net/url"
	"strconv"
)

// ArchiveFileResponse represents an archive file in API responses
type ArchiveFileResponse struct {
	ID              string `json:"id"`
	ArchiveID       string `json:"archive_id"`
	ArchiverKey     string `json:"extractor_key"` // JSON tag kept for backward compatibility
	Filename        string `json:"filename"`
	MimeType        string `json:"mime_type"`
	FileSize        int64  `json:"file_size"`
	HashSha256      string `json:"hash_sha256"`
	CreatedAt       string `json:"created_at"`
	DownloadURL     string `json:"download_url"`
	Content         string `json:"content,omitempty"`
	ContentMimeType string `json:"content_mime_type,omitempty"`
}

// CategoryResponse represents a category in API responses
type CategoryResponse struct {
	ID   string `json:"id"`
	Name string `json:"name"`
	Icon string `json:"icon"`
}

// LinkListItem represents a link in the domain layer for API responses
// This separates API concerns from database persistence models
type LinkListItem struct {
	Link

	// Computed/aggregated fields
	LatestArchiveTitle  string               `json:"latest_archive_title,omitempty"`
	LatestArchiveStatus string               `json:"latest_archive_status,omitempty"`
	Thumbnail           *ArchiveFileResponse `json:"thumbnail,omitempty"`
	Categories          []CategoryResponse   `json:"categories,omitempty"`

	// Internal fields (not serialized)
	ThumbnailURL string `json:"-"` // Only populated if IncludeThumbnail is true
	HasThumbnail bool   `json:"-"` // Indicates if thumbnail exists
}

// LinkDomain defines the interface for link operations
type LinkDomain interface {
	CreateLink(ctx context.Context, url, userID string) (*Link, error)
	GetLink(ctx context.Context, id string) (*Link, error)
	ListLinks(ctx context.Context, req LinkListRequest) ([]LinkListItem, int, error)
	DeleteLink(ctx context.Context, id string) error
}

// ArchiveDomain defines the interface for archive operations
type ArchiveDomain interface {
	GetArchive(ctx context.Context, archiveID string) (*Archive, error)
	GetArchiveHistory(ctx context.Context, linkID string) ([]*Archive, error)
	ReArchiveLink(ctx context.Context, linkID string) error
	GetArchiveFiles(ctx context.Context, archiveID string) ([]*ArchiveFile, error)
	GetArchiveFile(ctx context.Context, fileID string) (*ArchiveFile, error)
	DeleteArchive(ctx context.Context, archiveID string) error
	ProcessArchive(ctx context.Context, archive *Archive, link *Link, archiverKeys []string) error
}

// CategoryDomain defines the interface for category operations
type CategoryDomain interface {
	DetermineCategoriesFromMimeType(ctx context.Context, mimeType string) ([]string, error)
	UpdateLinkCategories(ctx context.Context, linkID string, mimeTypes []string) error
	ListCategories(ctx context.Context) ([]*Category, error)
}

// AuthDomain defines the interface for authentication operations
type AuthDomain interface {
	Login(email, password string) (*User, *Token, error)
	CreateUser(email, password, role string) (*User, error)
	VerifyPassword(user *User, password string) bool
	ListUsers() ([]*User, error)
	GetUser(id string) (*User, error)
	UpdateUser(id, email, role string) (*User, error)
	UpdateUserPassword(id, password string) error
	DeleteUser(id string) error
}

// LinkListRequest contains request parameters for listing links
type LinkListRequest struct {
	UserID           string
	Limit            int
	Offset           int
	CategoryID       string
	IncludeThumbnail bool
	SearchQuery      string
}

// Defaults sets sensible defaults for LinkListRequest
func (r *LinkListRequest) Defaults() {
	if r.Limit == 0 {
		r.Limit = 50 // Default limit
	}
	if r.Offset < 0 {
		r.Offset = 0
	}
}

// IsValid validates LinkListRequest
func (r *LinkListRequest) IsValid() error {
	if r.UserID == "" {
		return ErrInvalidRequest
	}
	if r.Limit < 1 || r.Limit > 100 {
		return ErrInvalidRequest
	}
	if r.Offset < 0 {
		return ErrInvalidRequest
	}
	return nil
}

// FromURLValues parses query parameters from url.Values into the request struct
func (r *LinkListRequest) FromURLValues(values url.Values) error {
	// Parse limit
	if limitStr := values.Get("limit"); limitStr != "" {
		limit, err := strconv.Atoi(limitStr)
		if err != nil {
			return fmt.Errorf("invalid limit parameter: %w", err)
		}
		r.Limit = limit
	}

	// Parse offset
	if offsetStr := values.Get("offset"); offsetStr != "" {
		offset, err := strconv.Atoi(offsetStr)
		if err != nil {
			return fmt.Errorf("invalid offset parameter: %w", err)
		}
		r.Offset = offset
	}

	// Parse category_id
	if categoryID := values.Get("category_id"); categoryID != "" {
		r.CategoryID = categoryID
	}

	// Parse include_thumbnail
	if includeThumbnailStr := values.Get("include_thumbnail"); includeThumbnailStr != "" {
		includeThumbnail, err := strconv.ParseBool(includeThumbnailStr)
		if err != nil {
			return fmt.Errorf("invalid include_thumbnail parameter: %w", err)
		}
		r.IncludeThumbnail = includeThumbnail
	}

	// Parse search query (supports both 'q' and 'search' parameters)
	if searchQuery := values.Get("q"); searchQuery != "" {
		r.SearchQuery = searchQuery
	} else if searchQuery := values.Get("search"); searchQuery != "" {
		r.SearchQuery = searchQuery
	}

	return nil
}