// Package server wires the HTTP API + the embedded frontend onto a
// single net/http handler. Routes use Go 1.22 ServeMux pattern matching
// (no router framework).
package server

import (
	"io/fs"
	"net/http"

	"mgit.msbls.de/m/mcables/internal/db"
)

// New returns an http.Handler serving the mCables API at /api/ and the
// embedded frontend at /. The frontend FS should be rooted such that
// "index.html" is at its root.
func New(store *db.Store, frontend fs.FS) http.Handler {
	mux := http.NewServeMux()
	h := &handlers{store: store}

	// Health
	mux.HandleFunc("GET /api/healthz", h.healthz)

	// Projects
	mux.HandleFunc("GET /api/projects", h.listProjects)
	mux.HandleFunc("POST /api/projects", h.createProject)
	mux.HandleFunc("GET /api/projects/{pid}", h.getProject)
	mux.HandleFunc("PATCH /api/projects/{pid}", h.patchProject)
	mux.HandleFunc("DELETE /api/projects/{pid}", h.deleteProject)

	// Cable types (global)
	mux.HandleFunc("GET /api/cable-types", h.listCableTypes)
	mux.HandleFunc("POST /api/cable-types", h.createCableType)
	mux.HandleFunc("PATCH /api/cable-types/{id}", h.patchCableType)
	mux.HandleFunc("DELETE /api/cable-types/{id}", h.deleteCableType)

	// Frames (project-scoped)
	mux.HandleFunc("GET /api/projects/{pid}/frames", h.listFrames)
	mux.HandleFunc("POST /api/projects/{pid}/frames", h.createFrame)
	mux.HandleFunc("PATCH /api/projects/{pid}/frames/{id}", h.patchFrame)
	mux.HandleFunc("DELETE /api/projects/{pid}/frames/{id}", h.deleteFrame)

	// Devices (project-scoped)
	mux.HandleFunc("GET /api/projects/{pid}/devices", h.listDevices)
	mux.HandleFunc("POST /api/projects/{pid}/devices", h.createDevice)
	mux.HandleFunc("PATCH /api/projects/{pid}/devices/{id}", h.patchDevice)
	mux.HandleFunc("DELETE /api/projects/{pid}/devices/{id}", h.deleteDevice)

	// IO markers (project-scoped) — wall-outlet terminators
	mux.HandleFunc("GET /api/projects/{pid}/io-markers", h.listIOMarkers)
	mux.HandleFunc("POST /api/projects/{pid}/io-markers", h.createIOMarker)
	mux.HandleFunc("PATCH /api/projects/{pid}/io-markers/{id}", h.patchIOMarker)
	mux.HandleFunc("DELETE /api/projects/{pid}/io-markers/{id}", h.deleteIOMarker)

	// Ports — slice 7 lets m add/edit/remove instance ports on a device.
	mux.HandleFunc("GET /api/projects/{pid}/devices/{id}/ports", h.listPortsForDevice)
	mux.HandleFunc("POST /api/projects/{pid}/devices/{id}/ports", h.createPort)
	mux.HandleFunc("PATCH /api/projects/{pid}/ports/{id}", h.patchPort)
	mux.HandleFunc("DELETE /api/projects/{pid}/ports/{id}", h.deletePort)

	// Device-type catalog. Built-ins are read-only; project-custom rows
	// support full CRUD scoped to the project.
	mux.HandleFunc("GET /api/device-types", h.listBuiltInDeviceTypes)
	mux.HandleFunc("GET /api/projects/{pid}/device-types", h.listDeviceTypes)
	mux.HandleFunc("POST /api/projects/{pid}/device-types", h.createDeviceType)
	mux.HandleFunc("PATCH /api/projects/{pid}/device-types/{id}", h.patchDeviceType)
	mux.HandleFunc("DELETE /api/projects/{pid}/device-types/{id}", h.deleteDeviceType)

	// Connection requirements — the solver's per-project input.
	mux.HandleFunc("GET /api/projects/{pid}/connection-requirements", h.listConnectionRequirements)
	mux.HandleFunc("POST /api/projects/{pid}/connection-requirements", h.createConnectionRequirement)
	mux.HandleFunc("PATCH /api/projects/{pid}/connection-requirements/{id}", h.patchConnectionRequirement)
	mux.HandleFunc("DELETE /api/projects/{pid}/connection-requirements/{id}", h.deleteConnectionRequirement)

	// Cables — slice 6: solver writes here with auto=1; slice 7 lets m
	// hand-draw with auto=0. PATCH supports `promote: true` to flip auto→0.
	mux.HandleFunc("GET /api/projects/{pid}/cables", h.listCables)
	mux.HandleFunc("POST /api/projects/{pid}/cables", h.createCable)
	mux.HandleFunc("PATCH /api/projects/{pid}/cables/{id}", h.patchCable)
	mux.HandleFunc("DELETE /api/projects/{pid}/cables/{id}", h.deleteCable)

	// Bundles — manual + auto.
	mux.HandleFunc("GET /api/projects/{pid}/bundles", h.listBundles)
	mux.HandleFunc("POST /api/projects/{pid}/bundles", h.createBundle)
	mux.HandleFunc("PATCH /api/projects/{pid}/bundles/{id}", h.patchBundle)
	mux.HandleFunc("DELETE /api/projects/{pid}/bundles/{id}", h.deleteBundle)

	// Solver + quick-fix combo + setup templates.
	mux.HandleFunc("POST /api/projects/{pid}/solve", h.solve)
	mux.HandleFunc("POST /api/projects/{pid}/devices/{id}/ports-and-resolve", h.portsAndResolve)
	mux.HandleFunc("GET /api/setup-templates", h.listSetupTemplates)
	mux.HandleFunc("POST /api/projects/{pid}/apply-template", h.applyTemplate)

	// Slice 8 — export to mxdrw.msbls.de
	mux.HandleFunc("POST /api/projects/{pid}/sync/export", h.syncExport)

	// Frontend (embedded). Serve "/" → index.html via http.FileServerFS.
	// Wrap in noCache so the browser revalidates with the ETag/Last-Modified
	// the file server already emits — without this, browsers cache aggressively
	// and m sees the old main.js after every redeploy until hard-reload.
	mux.Handle("/", noCache(http.FileServerFS(frontend)))

	return mux
}

// noCache wraps a static handler so each response carries
// Cache-Control: no-cache. Combined with the ETag/Last-Modified headers
// http.FileServer(FS) already emits, this turns every fetch into a
// cheap revalidation request — the browser uses its cached body when
// the ETag matches but always asks first, so freshly-built assets show
// up on the next page load without a hard-reload.
//
// Applied to the static-asset handler only — API responses write their
// own headers and aren't routed through this.
func noCache(h http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Cache-Control", "no-cache")
		h.ServeHTTP(w, r)
	})
}