// Package api 负责 HTTP 接口路由装配。
package api

import (
	"net/http"
	"path"

	"github.com/gin-gonic/gin"
	swaggerFiles "github.com/swaggo/files"
	ginSwagger "github.com/swaggo/gin-swagger"
	"gorm.io/gorm"

	"rill/internal/auth"
	"rill/internal/avatar"
	"rill/internal/config"
	"rill/internal/database"
	"rill/internal/file"
	"rill/internal/nav"
	"rill/internal/note"
	"rill/internal/site"
	"rill/internal/user"
	"rill/internal/usergroup"
)

// RegisterRoutes 注册 API 路由。health、swagger、auth、站点信息、文件查看与头部导航读取公开；notes、个人资料与文件上传删除需登录；站点信息更新、导航维护、用户与用户组管理仅限管理员。
func RegisterRoutes(rg *gin.RouterGroup, db *gorm.DB, cfg *config.Config) {
	authn := auth.NewAuthenticator(cfg)

	rg.GET("/health", health(db))

	swagger := rg.Group("/swagger")
	{
		swagger.GET("", func(c *gin.Context) {
			c.Redirect(http.StatusFound, path.Join("/", rg.BasePath(), "swagger", "index.html"))
		})
		swagger.GET("/*any", ginSwagger.WrapHandler(swaggerFiles.Handler, ginSwagger.URL("doc.json")))
	}

	authGroup := rg.Group("/auth")
	{
		authGroup.POST("/register", auth.Register(db))
		authGroup.POST("/login", auth.Login(db, authn))
	}

	rg.GET("/site", site.Get(db))
	rg.GET("/files/:id", file.View(db, cfg))
	rg.GET("/nav-links", nav.List(db))

	authed := rg.Group("", authn.RequireAuth(db))
	{
		authed.GET("/me", auth.Me())
		authed.PUT("/me", auth.UpdateMe(db))
		authed.PUT("/me/avatar", avatar.Update(db, cfg))
		authed.DELETE("/me/avatar", avatar.Delete(db, cfg))
		authed.POST("/files", file.Upload(db, cfg))
		authed.DELETE("/files/:id", file.Delete(db, cfg))

		notes := authed.Group("/notes")
		{
			notes.GET("", note.List(db))
			notes.POST("", note.Create(db))
			notes.GET("/:id", note.Get(db))
			notes.PUT("/:id", note.Update(db))
			notes.DELETE("/:id", note.Delete(db))
		}
	}

	admin := rg.Group("", authn.RequireAuth(db), auth.RequireAdmin())
	{
		admin.PUT("/site", site.Update(db, cfg))
		admin.PUT("/site/logo", site.UploadLogo(db, cfg))
		admin.DELETE("/site/logo", site.DeleteLogo(db, cfg))
		admin.PUT("/site/favicon", site.UploadFavicon(db, cfg))
		admin.DELETE("/site/favicon", site.DeleteFavicon(db, cfg))

		admin.GET("/nav-links/list", nav.ListAll(db))
		admin.POST("/nav-links", nav.Create(db))
		admin.PUT("/nav-links/:id", nav.Update(db))
		admin.DELETE("/nav-links/:id", nav.Delete(db))

		users := admin.Group("/users")
		{
			users.GET("", user.List(db))
			users.POST("", user.Create(db))
			users.GET("/:id", user.Get(db))
			users.PUT("/:id", user.Update(db))
			users.DELETE("/:id", user.Delete(db))
		}

		groups := admin.Group("/user-groups")
		{
			groups.GET("", usergroup.List(db))
			groups.POST("", usergroup.Create(db))
			groups.GET("/:id", usergroup.Get(db))
			groups.PUT("/:id", usergroup.Update(db))
			groups.DELETE("/:id", usergroup.Delete(db))
		}
	}
}

// HealthResponse 健康检查响应。
type HealthResponse struct {
	Status string `json:"status" example:"ok"`
	Error  string `json:"error,omitempty" example:"database unavailable"`
}

// @Summary      Health check
// @Description  Check service and database connectivity; returns 503 when the database is unavailable.
// @Tags         public
// @Produce      json
// @Success      200  {object}  api.HealthResponse
// @Failure      503  {object}  api.HealthResponse
// @Router       /health [get]
func health(db *gorm.DB) gin.HandlerFunc {
	return func(c *gin.Context) {
		if err := database.Ping(c.Request.Context(), db); err != nil {
			c.JSON(http.StatusServiceUnavailable, HealthResponse{Status: "error", Error: "database unavailable"})
			return
		}
		c.JSON(http.StatusOK, HealthResponse{Status: "ok"})
	}
}