package server

import (
	"net/http"

	"gcy_hpc_server/internal/middleware"

	"github.com/gin-gonic/gin"
	"go.uber.org/zap"
)

type JobHandler interface {
	SubmitJob(c *gin.Context)
	GetJobs(c *gin.Context)
	GetJobHistory(c *gin.Context)
	GetJob(c *gin.Context)
	CancelJob(c *gin.Context)
}

type ClusterHandler interface {
	GetNodes(c *gin.Context)
	GetNode(c *gin.Context)
	GetPartitions(c *gin.Context)
	GetPartition(c *gin.Context)
	GetDiag(c *gin.Context)
}

type ApplicationHandler interface {
	ListApplications(c *gin.Context)
	CreateApplication(c *gin.Context)
	GetApplication(c *gin.Context)
	UpdateApplication(c *gin.Context)
	DeleteApplication(c *gin.Context)
	SubmitApplication(c *gin.Context)
}

type UploadHandler interface {
	InitUpload(c *gin.Context)
	GetUploadStatus(c *gin.Context)
	UploadChunk(c *gin.Context)
	CompleteUpload(c *gin.Context)
	CancelUpload(c *gin.Context)
}

type FileHandler interface {
	ListFiles(c *gin.Context)
	GetFile(c *gin.Context)
	DownloadFile(c *gin.Context)
	DeleteFile(c *gin.Context)
}

type FolderHandler interface {
	CreateFolder(c *gin.Context)
	GetFolder(c *gin.Context)
	ListFolders(c *gin.Context)
	DeleteFolder(c *gin.Context)
}

type TaskHandler interface {
	CreateTask(c *gin.Context)
	ListTasks(c *gin.Context)
}

// NewRouter creates a Gin engine with all API v1 routes registered with real handlers.
func NewRouter(jobH JobHandler, clusterH ClusterHandler, appH ApplicationHandler, uploadH UploadHandler, fileH FileHandler, folderH FolderHandler, taskH TaskHandler, logger *zap.Logger) *gin.Engine {
	gin.SetMode(gin.ReleaseMode)
	r := gin.New()
	r.Use(gin.Recovery())
	if logger != nil {
		r.Use(middleware.RequestLogger(logger))
	}

	v1 := r.Group("/api/v1")

	jobs := v1.Group("/jobs")
	jobs.POST("/submit", jobH.SubmitJob)
	jobs.GET("", jobH.GetJobs)
	jobs.GET("/history", jobH.GetJobHistory)
	jobs.GET("/:id", jobH.GetJob)
	jobs.DELETE("/:id", jobH.CancelJob)

	v1.GET("/nodes", clusterH.GetNodes)
	v1.GET("/nodes/:name", clusterH.GetNode)

	v1.GET("/partitions", clusterH.GetPartitions)
	v1.GET("/partitions/:name", clusterH.GetPartition)

	v1.GET("/diag", clusterH.GetDiag)

	apps := v1.Group("/applications")
	apps.GET("", appH.ListApplications)
	apps.POST("", appH.CreateApplication)
	apps.GET("/:id", appH.GetApplication)
	apps.PUT("/:id", appH.UpdateApplication)
	apps.DELETE("/:id", appH.DeleteApplication)
	apps.POST("/:id/submit", appH.SubmitApplication)

	files := v1.Group("/files")

	if uploadH != nil {
		uploads := files.Group("/uploads")
		uploads.POST("", uploadH.InitUpload)
		uploads.GET("/:id", uploadH.GetUploadStatus)
		uploads.PUT("/:id/chunks/:index", uploadH.UploadChunk)
		uploads.POST("/:id/complete", uploadH.CompleteUpload)
		uploads.DELETE("/:id", uploadH.CancelUpload)
	}

	if fileH != nil {
		files.GET("", fileH.ListFiles)
		files.GET("/:id", fileH.GetFile)
		files.GET("/:id/download", fileH.DownloadFile)
		files.DELETE("/:id", fileH.DeleteFile)
	}

	if folderH != nil {
		folders := files.Group("/folders")
		folders.POST("", folderH.CreateFolder)
		folders.GET("", folderH.ListFolders)
		folders.GET("/:id", folderH.GetFolder)
		folders.DELETE("/:id", folderH.DeleteFolder)
	}

	if taskH != nil {
		tasks := v1.Group("/tasks")
		{
			tasks.POST("", taskH.CreateTask)
			tasks.GET("", taskH.ListTasks)
		}
	}

	return r
}

// NewTestRouter creates a router for testing without real handlers.
func NewTestRouter() *gin.Engine {
	gin.SetMode(gin.TestMode)
	r := gin.New()
	r.Use(gin.Recovery())
	v1 := r.Group("/api/v1")
	registerPlaceholderRoutes(v1)
	return r
}

func registerPlaceholderRoutes(v1 *gin.RouterGroup) {
	jobs := v1.Group("/jobs")
	jobs.POST("/submit", notImplemented)
	jobs.GET("", notImplemented)
	jobs.GET("/history", notImplemented)
	jobs.GET("/:id", notImplemented)
	jobs.DELETE("/:id", notImplemented)

	v1.GET("/nodes", notImplemented)
	v1.GET("/nodes/:name", notImplemented)

	v1.GET("/partitions", notImplemented)
	v1.GET("/partitions/:name", notImplemented)

	v1.GET("/diag", notImplemented)

	apps := v1.Group("/applications")
	apps.GET("", notImplemented)
	apps.POST("", notImplemented)
	apps.GET("/:id", notImplemented)
	apps.PUT("/:id", notImplemented)
	apps.DELETE("/:id", notImplemented)
	apps.POST("/:id/submit", notImplemented)

	files := v1.Group("/files")

	uploads := files.Group("/uploads")
	uploads.POST("", notImplemented)
	uploads.GET("/:id", notImplemented)
	uploads.PUT("/:id/chunks/:index", notImplemented)
	uploads.POST("/:id/complete", notImplemented)
	uploads.DELETE("/:id", notImplemented)

	files.GET("", notImplemented)
	files.GET("/:id", notImplemented)
	files.GET("/:id/download", notImplemented)
	files.DELETE("/:id", notImplemented)

	folders := files.Group("/folders")
	folders.POST("", notImplemented)
	folders.GET("", notImplemented)
	folders.GET("/:id", notImplemented)
	folders.DELETE("/:id", notImplemented)

	v1.POST("/tasks", notImplemented)
	v1.GET("/tasks", notImplemented)
}

func notImplemented(c *gin.Context) {
	c.JSON(http.StatusNotImplemented, APIResponse{
		Success: false,
		Error:   "not implemented",
	})
}