package preflight

import (
	"context"
	"os"
	"strconv"
	"strings"
	"testing"
	"time"

	"gitea.mynodes.xyz/ilker/llmgw/internal/onboard"
)

func facts(over map[string]string) map[string]string {
	f := map[string]string{
		"os": "ubuntu", "version": "24.04", "pretty": "Ubuntu 24.04.3 LTS", "arch": "x86_64",
		"cpus": "2", "mem_mb": "3900", "disk_gb": "35", "ntp": "yes", "listening": "22 53",
		"sudo": "yes", "apt": "yes", "internet": "yes",
		"now": strconv.FormatFloat(float64(time.Now().UnixNano())/1e9, 'f', 3, 64),
	}
	for k, v := range over {
		f[k] = v
	}
	return f
}

func levelOf(fs []Finding, check string) (Level, string) {
	for _, f := range fs {
		if f.Check == check {
			return f.Level, f.Detail
		}
	}
	return -1, ""
}

func TestAMachineFitForItsRoleHasNothingWrong(t *testing.T) {
	fs := Evaluate(Machine{Name: "pg01", Roles: []Role{RoleDatabase}}, facts(nil), time.Now())
	if r := (Report{Findings: fs}); r.Worst() != OK {
		t.Errorf("%+v", fs)
	}
}

func TestEachProblemIsFoundAndSaysWhatToDo(t *testing.T) {
	m := Machine{Name: "x", Roles: []Role{RoleDatabase, RoleControl}}
	cases := []struct {
		over  map[string]string
		check string
		want  Level
	}{
		{map[string]string{"os": "centos", "version": "9"}, "system", Fail},
		{map[string]string{"version": "20.04"}, "system", Warn},
		{map[string]string{"arch": "riscv64"}, "architecture", Fail},
		{map[string]string{"sudo": "no"}, "sudo", Warn},
		{map[string]string{"mem_mb": "1000"}, "memory", Fail},
		{map[string]string{"disk_gb": "20"}, "disk", Warn},
		{map[string]string{"ntp": "no"}, "time sync", Warn},
		{map[string]string{"listening": "22 5432"}, "ports", Warn},
		{map[string]string{"internet": "no"}, "internet", Fail},
		{map[string]string{"now": strconv.FormatFloat(float64(time.Now().Add(-30*time.Second).UnixNano())/1e9, 'f', 3, 64)}, "clock", Fail},
	}
	for _, c := range cases {
		fs := Evaluate(m, facts(c.over), time.Now())
		got, detail := levelOf(fs, c.check)
		if got != c.want {
			t.Errorf("%v: %s is %v (%s), want %v", c.over, c.check, got, detail, c.want)
		}
		for _, f := range fs {
			if f.Level != OK && f.Fix == "" {
				t.Errorf("%s: %s says nothing about what to do", c.check, f.Check)
			}
		}
	}
	// This machine is run as root; sudo is not its question.
	if l, _ := levelOf(Evaluate(Machine{Name: "here", Local: true}, facts(map[string]string{"sudo": "no"}), time.Now()), "sudo"); l != -1 {
		t.Error("the local machine was asked about sudo")
	}
}

func TestAMachineThatCannotReachAnotherIsCalledOut(t *testing.T) {
	fs := evaluateReach(Machine{Name: "a"}, "reach 10.0.0.2 yes\nreach 10.0.0.3 no\n")
	if fs[0].Level != Fail || !strings.Contains(fs[0].Detail, "10.0.0.3") {
		t.Errorf("%+v", fs)
	}
}

// TestAgainstRealMachines runs the probe over ssh when LLMGW_TEST_PREFLIGHT
// names user@host,user@host: the scripts are shell, and only a real machine
// says whether they parse.
func TestAgainstRealMachines(t *testing.T) {
	targets := os.Getenv("LLMGW_TEST_PREFLIGHT")
	if targets == "" {
		t.Skip("set LLMGW_TEST_PREFLIGHT=user@host,user@host to run against machines")
	}
	var ms []Machine
	for _, tgt := range strings.Split(targets, ",") {
		user, host, _ := strings.Cut(tgt, "@")
		ms = append(ms, Machine{Name: host, Addr: host, Roles: []Role{RoleDatabase},
			Remote: &onboard.GoSSH{Addr: host, User: user, UseAgent: true}})
	}
	rep := Run(context.Background(), ms)
	for _, f := range rep.Findings {
		t.Logf("%-12s %-12s %-5s %s", f.Machine, f.Check, f.Level, f.Detail)
	}
	for _, f := range rep.Findings {
		if f.Check == "login" && f.Level != OK {
			t.Fatalf("could not log in: %s", f.Detail)
		}
	}
}