package stacks

import (
	"io"
	"log"
	"os"
	"strings"
	"testing"

	"gitea.dooplex.hu/admin/felhom-controller/internal/config"
)

// R-1125: the install page and the install check read memory the SAME way. „Used" is the installed (running) apps'
// committed requests — never /proc's host-wide figure, which the page used before 2026-10-17 (on scratch 9202 it
// showed 12,637 MB „needed" while the check counted 2,648 MB).
// RED-PROOF (2026-10-17): the deploy handler back on system.GetMemoryMB fails the source half.
func TestR1125_InstallMemoryIsTheChecksReading(t *testing.T) {
	cfg := config.Default()
	m := &Manager{cfg: cfg, logger: log.New(io.Discard, "", 0), stacks: map[string]*Stack{
		"a": {Deployed: true, State: StateRunning, Meta: Metadata{Resources: ResourceHints{MemRequest: "600M", MemLimit: "1664M"}}},
		"b": {Deployed: true, State: StateRunning, Meta: Metadata{Resources: ResourceHints{MemRequest: "2048M", MemLimit: "4096M"}}},
		"c": {Deployed: true, State: StateStopped, Meta: Metadata{Resources: ResourceHints{MemRequest: "900M"}}},
		"d": {Deployed: false, Meta: Metadata{Resources: ResourceHints{MemRequest: "500M"}}},
	}}
	_, reserved, used, ok := m.InstallMemory()
	if !ok {
		t.Skip("no memory reading on this platform")
	}
	if used != 2648 {
		t.Fatalf("„used\" must be the running installed apps' requests (600+2048), got %d", used)
	}
	if reserved != cfg.System.ReservedMemoryMB {
		t.Fatalf("reserve %d, want the configured %d", reserved, cfg.System.ReservedMemoryMB)
	}
	src, err := os.ReadFile("../web/handlers.go")
	if err != nil {
		t.Fatal(err)
	}
	body := string(src)
	i := strings.Index(body, "// Memory info for deploy page")
	if i < 0 {
		t.Fatal("the deploy page's memory block moved — re-point this test")
	}
	block := body[i : i+1200]
	if !strings.Contains(block, "s.stackMgr.InstallMemory()") || strings.Contains(block, "system.GetMemoryMB()") {
		t.Fatalf("the install page must read memory through InstallMemory, the check's own reading:\n%s", block)
	}
}