package httpapi

import (
	"encoding/json"
	"net/http"

	"spin/internal/config"
	"spin/internal/mailsync"
	"spin/internal/push"
	"spin/internal/storage"

	"github.com/go-chi/chi/v5"
	"github.com/go-chi/chi/v5/middleware"
	"github.com/go-chi/cors"
	"gorm.io/gorm"
)

// Server bundles dependencies shared by all handlers.
type Server struct {
	db    *gorm.DB
	store *storage.Storage
	cfg   config.Config
	push  *push.Sender
	mail  *mailsync.Service
}

// NewRouter wires up the chi router and mounts the /api routes for every module.
func NewRouter(db *gorm.DB, store *storage.Storage, cfg config.Config, pusher *push.Sender, mailer *mailsync.Service) http.Handler {
	s := &Server{db: db, store: store, cfg: cfg, push: pusher, mail: mailer}

	r := chi.NewRouter()
	r.Use(middleware.RequestID)
	r.Use(middleware.RealIP)
	r.Use(middleware.Recoverer)

	r.Use(cors.Handler(cors.Options{
		AllowedOrigins:   []string{"*"},
		AllowedMethods:   []string{"GET", "POST", "PATCH", "PUT", "DELETE", "OPTIONS"},
		AllowedHeaders:   []string{"*"},
		ExposedHeaders:   []string{"*"},
		AllowCredentials: false,
		MaxAge:           300,
	}))

	r.Route("/api", func(r chi.Router) {
		// Public health for k8s probes.
		r.Get("/health", s.handleHealth)

		r.Group(func(r chi.Router) {
			r.Use(authMiddleware(cfg.DevAuth, cfg.AdminGroups))
			// auto-provision a Member on first login (Keycloak), then continue.
			r.Use(s.ensureMember)

			// identity / navigation
			r.Get("/me", s.handleMe)
			r.Get("/me/nav", s.handleNav)
			r.Post("/me/avatar", s.handleUploadAvatar)

			// push device registration (spin-mobile)
			r.Post("/devices", s.handleRegisterDevice)
			r.Post("/devices/unregister", s.handleUnregisterDevice)

			// inbox / notifications (메일함)
			r.Get("/notifications", s.handleListNotifications)
			r.Get("/notifications/unread-count", s.handleUnreadCount)
			r.Post("/notifications/{id}/read", s.handleMarkRead)
			r.Post("/notifications/read-all", s.handleMarkAllRead)

			// ---- slice 1: members / org ----
			r.Get("/members", s.handleListMembers)
			r.Get("/members/directory", s.handleMemberDirectory)
			r.Post("/members", s.handleCreateMember)
			r.Get("/members/{id}", s.handleGetMember)
			r.Get("/members/{id}/avatar", s.handleGetAvatar)
			r.Patch("/members/{id}", s.handlePatchMember)
			r.Delete("/members/{id}", s.handleDeleteMember)
			r.Get("/departments", s.handleListDepartments)
			r.Post("/departments", s.handleCreateDepartment)
			r.Patch("/departments/{id}", s.handlePatchDepartment)
			r.Delete("/departments/{id}", s.handleDeleteDepartment)
			r.Get("/audit", s.handleListAudit)

			// ---- slice 2: attendance / leave ----
			r.Get("/attendance", s.handleListAttendance)         // own (admin: ?email= or all)
			r.Post("/attendance/punch", s.handlePunch)           // clock in/out
			r.Post("/attendance/status", s.handleSetWorkStatus)  // 출근/퇴근/휴식/미팅/이동
			r.Get("/attendance/status", s.handleListWorkStatus)  // presence log (admin: all/?email=)
			r.Get("/attendance/timesheet", s.handleTimesheet)    // monthly roll-up (admin mgmt)
			r.Get("/leave", s.handleListLeave)
			r.Get("/leave/balance", s.handleLeaveBalance)        // 남은 연차(소수점)
			r.Post("/leave", s.handleCreateLeave)
			r.Post("/leave/{id}/decide", s.handleDecideLeave)    // admin approve/reject
			r.Post("/leave/{id}/cancel", s.handleCancelLeave)
			r.Get("/overtime", s.handleListOvertime)
			r.Post("/overtime", s.handleCreateOvertime)
			r.Post("/overtime/{id}/decide", s.handleDecideOvertime)
			r.Get("/work-policy", s.handleGetWorkPolicy)
			r.Put("/work-policy", s.handlePutWorkPolicy)
			r.Get("/approvals", s.handleApprovalQueue)           // admin queue

			// ---- slice 3: projects ----
			r.Get("/companies", s.handleListCompanies)
			r.Post("/companies", s.handleCreateCompany)
			r.Patch("/companies/{id}", s.handlePatchCompany)
			r.Delete("/companies/{id}", s.handleDeleteCompany)
			r.Get("/products", s.handleListProducts)
			r.Post("/products", s.handleCreateProduct)
			r.Patch("/products/{id}", s.handlePatchProduct)
			r.Delete("/products/{id}", s.handleDeleteProduct)
			r.Get("/versions", s.handleListVersions)
			r.Post("/versions", s.handleCreateVersion)
			r.Patch("/versions/{id}", s.handlePatchVersion)
			r.Delete("/versions/{id}", s.handleDeleteVersion)
			r.Get("/projects", s.handleListProjects)
			r.Post("/projects", s.handleCreateProject)
			r.Get("/projects/{id}", s.handleGetProject)
			r.Patch("/projects/{id}", s.handlePatchProject)
			r.Delete("/projects/{id}", s.handleDeleteProject)
			r.Get("/projects/{id}/members", s.handleListProjectMembers)
			r.Post("/projects/{id}/members", s.handleUpsertProjectMember)
			r.Delete("/project-members/{pmId}", s.handleDeleteProjectMember)
			r.Get("/projects/{id}/contacts", s.handleListContacts)
			r.Post("/projects/{id}/contacts", s.handleUpsertContact)
			r.Delete("/contacts/{cId}", s.handleDeleteContact)
			r.Patch("/projects/{id}/notes", s.handlePatchProjectNotes)
			r.Get("/my/tasks", s.handleMyTasks)
			r.Get("/calendar/events", s.handleListEvents)
			r.Post("/calendar/events", s.handleCreateEvent)
			r.Patch("/calendar/events/{eId}", s.handlePatchEvent)
			r.Delete("/calendar/events/{eId}", s.handleDeleteEvent)
			r.Get("/projects/{id}/tasks", s.handleListTasks)
			r.Post("/projects/{id}/tasks", s.handleCreateTask)
			r.Patch("/tasks/{tId}", s.handlePatchTask)
			r.Delete("/tasks/{tId}", s.handleDeleteTask)
			r.Get("/tasks/{tId}/comments", s.handleListTaskComments)
			r.Post("/tasks/{tId}/comments", s.handleCreateTaskComment)
			r.Delete("/comments/{cId}", s.handleDeleteTaskComment)
			// project mail (Google Workspace 도메인 위임) + 공동 메모
			r.Get("/projects/{id}/mails", s.handleListProjectMails)
			r.Get("/projects/{id}/mails/full", s.handleMailFull)
			r.Get("/projects/{id}/mails/attachment", s.handleMailAttachment)
			r.Post("/projects/{id}/mails/sync", s.handleSyncProjectMail)
			r.Put("/projects/{id}/mail-hide", s.handleHideMail)
			r.Get("/projects/{id}/mail-notes", s.handleListMailNotes)
			r.Put("/projects/{id}/mail-notes", s.handlePutMailNote)
			// admin-only commercial block
			r.Get("/projects/{id}/contract", s.handleGetContract)
			r.Put("/projects/{id}/contract", s.handlePutContract)
			r.Get("/projects/{id}/files", s.handleListContractFiles)
			r.Post("/projects/{id}/files", s.handleUploadContractFile)
			r.Get("/files/{fId}/download", s.handleDownloadContractFile)
			r.Delete("/files/{fId}", s.handleDeleteContractFile)
			r.Get("/projects/{id}/payments", s.handleListPayments)
			r.Post("/projects/{id}/payments", s.handleCreatePayment)
			r.Patch("/payments/{payId}", s.handlePatchPayment)
			r.Delete("/payments/{payId}", s.handleDeletePayment)

			// ---- slice 4: incentive ----
			r.Get("/incentive/config", s.handleGetIncentiveConfig)
			r.Put("/incentive/config", s.handlePutIncentiveConfig)
			r.Get("/incentive/me", s.handleMyIncentive)                 // member dashboard
			r.Get("/incentive/stages", s.handleListStages)             // ?projectId=
			r.Post("/incentive/projects/{id}/recompute", s.handleRecomputeProject)
			r.Post("/incentive/stages/{stId}/status", s.handleSetStageStatus)
			r.Get("/incentive/user-incentives", s.handleListUserIncentives)
			r.Patch("/incentive/user-incentives/{uiId}", s.handlePatchUserIncentive)
			r.Get("/incentive/settlements", s.handleListSettlements)
			r.Post("/incentive/settlements/run", s.handleRunSettlement)
			r.Post("/incentive/settlements/{sId}/fix", s.handleFixSettlement)
			r.Post("/incentive/simulate", s.handleSimulate)

			// ---- slice 5: accounting ----
			r.Get("/accounts", s.handleListAccounts)
			r.Post("/accounts", s.handleCreateAccount)
			r.Get("/transactions", s.handleListTransactions)
			r.Post("/transactions", s.handleCreateTransaction)
			r.Patch("/transactions/{txId}", s.handlePatchTransaction)
			r.Delete("/transactions/{txId}", s.handleDeleteTransaction)
			r.Get("/taxes", s.handleListTaxes)
			r.Post("/taxes", s.handleCreateTax)
			r.Patch("/taxes/{taxId}", s.handlePatchTax)
			r.Delete("/taxes/{taxId}", s.handleDeleteTax)
			r.Get("/accounting/summary", s.handleAccountingSummary)   // cashflow vs incentive gap

			// ---- slice 6: dashboard ----
			r.Get("/dashboard", s.handleDashboard)
		})
	})

	return r
}

func (s *Server) handleHealth(w http.ResponseWriter, _ *http.Request) {
	writeJSON(w, http.StatusOK, map[string]string{"status": "ok"})
}

// --- shared helpers ---------------------------------------------------------

func writeJSON(w http.ResponseWriter, status int, v interface{}) {
	w.Header().Set("Content-Type", "application/json; charset=utf-8")
	w.WriteHeader(status)
	_ = json.NewEncoder(w).Encode(v)
}

func writeError(w http.ResponseWriter, status int, msg string) {
	writeJSON(w, status, map[string]string{"error": msg})
}

func decodeJSON(r *http.Request, v interface{}) error {
	return json.NewDecoder(r.Body).Decode(v)
}