syntax = "v1"

info (
	title:   "Blog API"
	desc:    "Blog service API with file upload/download and CRUD operations"
	author:  "cialloo"
	date:    "2025-10-22"
	version: "v1"
)

// ============= File Upload/Download Types =============
type (
	// Request for generating presigned upload URL
	GenerateUploadUrlReq {
		FileName string `json:"file_name"` // Original file name
		FileSize int64  `json:"file_size"` // File size in bytes
	}

	GenerateUploadUrlResp {
		FileId       int64  `json:"file_id"`        // Generated file ID
		PresignedUrl string `json:"presigned_url"`  // S3 presigned upload URL
		FileKey      string `json:"file_key"`       // S3 file key
		ExpiresIn    int    `json:"expires_in"`     // URL expiration time in seconds
	}

	// Request for generating presigned download URL
	GenerateDownloadUrlReq {
		FileId int64 `path:"file_id"` // File ID to download
	}

	GenerateDownloadUrlResp {
		FileName     string `json:"file_name"`      // Original file name
		PresignedUrl string `json:"presigned_url"`  // S3 presigned download URL
		FileSize     int64  `json:"file_size"`      // File size in bytes
		ExpiresIn    int    `json:"expires_in"`     // URL expiration time in seconds
	}

	// Confirm upload completion
	ConfirmUploadReq {
		FileId int64 `json:"file_id"` // File ID to confirm
	}

	ConfirmUploadResp {
		Success bool   `json:"success"` // Upload confirmation status
		Message string `json:"message"` // Status message
	}
)

// ============= Post Types =============
type (
	// Create post request
	CreatePostReq {
		Title    string   `json:"title"`              // Post title
		Content  string   `json:"content"`            // Post content
		Hashtags []string `json:"hashtags,optional"`  // Associated hashtags
	}

	CreatePostResp {
		PostId int64 `json:"post_id"` // Created post ID
	}

	// Update post request
	UpdatePostReq {
		PostId   int64    `path:"post_id"`            // Post ID to update
		Title    string   `json:"title,optional"`     // New title
		Content  string   `json:"content,optional"`   // New content
		Hashtags []string `json:"hashtags,optional"`  // New hashtags (replaces all)
	}

	UpdatePostResp {
		Success bool `json:"success"` // Update status
	}

	// Delete post request
	DeletePostReq {
		PostId int64 `path:"post_id"` // Post ID to delete
	}

	DeletePostResp {
		Success bool `json:"success"` // Delete status
	}

	// Get post detail request
	GetPostReq {
		PostId int64 `path:"post_id"` // Post ID to retrieve
	}

	PostDetail {
		PostId    int64      `json:"post_id"`    // Post ID
		Title     string     `json:"title"`      // Post title
		Content   string     `json:"content"`    // Post content
		ViewCount int64      `json:"view_count"` // View count
		Hashtags  []Hashtag  `json:"hashtags"`   // Associated hashtags
		CreatedAt string     `json:"created_at"` // Creation timestamp
		UpdatedAt string     `json:"updated_at"` // Last update timestamp
	}

	GetPostResp {
		Post PostDetail `json:"post"` // Post detail
	}

	// List posts request
	ListPostsReq {
		Page     int    `form:"page,default=1"`       // Page number
		PageSize int    `form:"page_size,default=10"` // Items per page
		Hashtag  string `form:"hashtag,optional"`     // Filter by hashtag name
		SortBy   string `form:"sort_by,default=created_at,options=created_at|view_count|updated_at"` // Sort field
	}

	PostItem {
		PostId    int64     `json:"post_id"`    // Post ID
		Title     string    `json:"title"`      // Post title
		ViewCount int64     `json:"view_count"` // View count
		Hashtags  []Hashtag `json:"hashtags"`   // Associated hashtags
		CreatedAt string    `json:"created_at"` // Creation timestamp
		UpdatedAt string    `json:"updated_at"` // Last update timestamp
	}

	ListPostsResp {
		Posts      []PostItem `json:"posts"`       // List of posts
		Total      int64      `json:"total"`       // Total count
		Page       int        `json:"page"`        // Current page
		PageSize   int        `json:"page_size"`   // Items per page
		TotalPages int        `json:"total_pages"` // Total pages
	}
)

// ============= Hashtag Types =============
type (
	Hashtag {
		HashtagId  int64  `json:"hashtag_id"`  // Hashtag ID
		Name       string `json:"name"`        // Hashtag name
		UsageCount int64  `json:"usage_count"` // Usage count
	}

	// List hashtags request
	ListHashtagsReq {
		Page     int    `form:"page,default=1"`       // Page number
		PageSize int    `form:"page_size,default=20"` // Items per page
		SortBy   string `form:"sort_by,default=usage_count,options=usage_count|created_at|name"` // Sort field
	}

	ListHashtagsResp {
		Hashtags   []Hashtag `json:"hashtags"`    // List of hashtags
		Total      int64     `json:"total"`       // Total count
		Page       int       `json:"page"`        // Current page
		PageSize   int       `json:"page_size"`   // Items per page
		TotalPages int       `json:"total_pages"` // Total pages
	}

	// Get popular hashtags
	GetPopularHashtagsReq {
		Limit int `form:"limit,default=10"` // Number of hashtags to return
	}

	GetPopularHashtagsResp {
		Hashtags []Hashtag `json:"hashtags"` // Popular hashtags
	}
)

// ============= Service Definition =============
@server (
	prefix: /api/v1/blog
	group:  file
)
service Blog {
	@doc "Generate presigned URL for file upload"
	@handler generateUploadUrl
	post /files/upload/url (GenerateUploadUrlReq) returns (GenerateUploadUrlResp)

	@doc "Generate presigned URL for file download"
	@handler generateDownloadUrl
	get /files/download/:file_id (GenerateDownloadUrlReq) returns (GenerateDownloadUrlResp)

	@doc "Confirm file upload completion"
	@handler confirmUpload
	post /files/upload/confirm (ConfirmUploadReq) returns (ConfirmUploadResp)
}

@server (
	prefix: /api/v1/blog
	group:  post
)
service Blog {
	@doc "Create a new blog post"
	@handler createPost
	post /posts (CreatePostReq) returns (CreatePostResp)

	@doc "Update an existing blog post"
	@handler updatePost
	put /posts/:post_id (UpdatePostReq) returns (UpdatePostResp)

	@doc "Delete a blog post"
	@handler deletePost
	delete /posts/:post_id (DeletePostReq) returns (DeletePostResp)

	@doc "Get blog post detail"
	@handler getPost
	get /posts/:post_id (GetPostReq) returns (GetPostResp)

	@doc "List blog posts with pagination and filtering"
	@handler listPosts
	get /posts (ListPostsReq) returns (ListPostsResp)
}

@server (
	prefix: /api/v1/blog
	group:  hashtag
)
service Blog {
	@doc "List all hashtags with pagination"
	@handler listHashtags
	get /hashtags (ListHashtagsReq) returns (ListHashtagsResp)

	@doc "Get popular hashtags"
	@handler getPopularHashtags
	get /hashtags/popular (GetPopularHashtagsReq) returns (GetPopularHashtagsResp)
}

@server (
	prefix: /api/v1/blog
	group:  common
)
service Blog {
	@doc "Health check endpoint"
	@handler ping
	get /ping
}