package inventory

import (
	"context"
	"reflect"
	"strings"
	"testing"
	"time"
)

// A build result was answered to whoever asked and kept nowhere, so "when did this last build",
// "why did it fail" and "which machine built what is running" had no answer at all.

func aBuild(id, module, failed string) Build {
	b := Build{
		ID: id, Repository: "https://forge.invalid/" + strings.TrimSuffix(module, "?") + ".git",
		Module: module, On: "a-build-machine", Failed: failed,
	}
	if failed == "" {
		b.Commit = "c0ffee" + id
		b.Made = []Artifact{{Name: "config", Kind: "archive", Reference: "…/blobs/sha256:…"}}
	}
	return b
}

func TestAFailedBuildIsARowLikeAnyOther(t *testing.T) {
	// One that leaves no trace is indistinguishable from a build nobody asked for, and the
	// difference is the whole of whether somebody should be looking at something.
	inv := fresh(t)
	ctx := context.Background()
	if err := inv.RecordBuild(ctx, aBuild("1", "", "cannot clone: no such repository")); err != nil {
		t.Fatal(err)
	}
	got, err := inv.Builds(ctx, "", 10)
	if err != nil {
		t.Fatal(err)
	}
	if len(got) != 1 {
		t.Fatalf("got %d builds", len(got))
	}
	if got[0].Worked() {
		t.Fatal("a failure was recorded as a success")
	}
	if !strings.Contains(got[0].Failed, "no such repository") {
		t.Fatalf("the builder's own words were not kept: %q", got[0].Failed)
	}
	// And it kept what was asked for, which is the only thing a person can go and look at when
	// the build never learned what it was building.
	if got[0].Module != "" || got[0].Repository == "" {
		t.Fatalf("got %+v", got[0])
	}
}

func TestOneResultRecordedTwiceIsOneBuild(t *testing.T) {
	// A result can arrive twice: as the answer to whoever asked, and on the exchange when nobody
	// was. Two rows would show one build as two, and which is real is not answerable afterwards.
	inv := fresh(t)
	ctx := context.Background()
	for i := 0; i < 2; i++ {
		if err := inv.RecordBuild(ctx, aBuild("same", "shell", "")); err != nil {
			t.Fatal(err)
		}
	}
	got, err := inv.Builds(ctx, "", 10)
	if err != nil {
		t.Fatal(err)
	}
	if len(got) != 1 {
		t.Fatalf("one build was recorded %d times", len(got))
	}
}

func TestBuildsComeBackNewestFirstAndCanBeAskedPerModule(t *testing.T) {
	inv := fresh(t)
	ctx := context.Background()
	for _, b := range []Build{
		aBuild("1", "shell", ""),
		aBuild("2", "meshboard", ""),
		aBuild("3", "shell", "the tests failed"),
	} {
		if err := inv.RecordBuild(ctx, b); err != nil {
			t.Fatal(err)
		}
	}

	all, err := inv.Builds(ctx, "", 10)
	if err != nil {
		t.Fatal(err)
	}
	if len(all) != 3 || all[0].ID != "3" {
		t.Fatalf("newest is not first: %v", ids(all))
	}

	// Per module, because "what has happened to this" is asked when deciding whether to trust it.
	shell, err := inv.Builds(ctx, "shell", 10)
	if err != nil {
		t.Fatal(err)
	}
	if len(shell) != 2 {
		t.Fatalf("shell has %d builds: %v", len(shell), ids(shell))
	}
	for _, b := range shell {
		if b.Module != "shell" {
			t.Fatalf("asked for shell and got %q", b.Module)
		}
	}
}

func TestWhatWasPublishedIsKeptWithTheBuild(t *testing.T) {
	// So a digest can be traced back to the build that made it, without keeping the manifest a
	// second time in a place that can disagree with the first.
	inv := fresh(t)
	ctx := context.Background()
	if err := inv.RecordBuild(ctx, aBuild("1", "shell", "")); err != nil {
		t.Fatal(err)
	}
	got, _ := inv.Builds(ctx, "", 10)
	if len(got[0].Made) != 1 || got[0].Made[0].Kind != "archive" {
		t.Fatalf("what was published was not kept: %+v", got[0].Made)
	}
}

func TestAskingForMoreThanThereIsIsNotAnError(t *testing.T) {
	inv := fresh(t)
	got, err := inv.Builds(context.Background(), "", 100)
	if err != nil {
		t.Fatal(err)
	}
	if len(got) != 0 {
		t.Fatalf("got %d", len(got))
	}
}

func ids(builds []Build) []string {
	var out []string
	for _, b := range builds {
		out = append(out, b.ID)
	}
	return out
}

// What a build read besides its module's own repository comes back for the newest build of each
// module, and only for builds that worked. Nothing recorded is absent rather than empty, which is how
// a build made before the mesh kept this is told from one that read nothing (novox/hq 04-ISSUES/131).
func TestWhatABuildReadComesBackForTheNewestBuildOfEachModule(t *testing.T) {
	inv := fresh(t)
	ctx := context.Background()
	older := aBuild("older", "builder", "")
	older.Read = []ReadRepository{{Repository: "novox/mesh-controller", Ref: "release"}}
	newer := aBuild("newer", "builder", "")
	newer.Read = []ReadRepository{{Repository: "novox/mesh-controller", Ref: "main"}}
	plain := aBuild("plain", "gitea", "")
	failed := aBuild("failed", "route-proxy", "cannot clone")
	failed.Read = []ReadRepository{{Repository: "novox/mesh-controller", Ref: "main"}}
	for _, b := range []Build{older, newer, plain, failed} {
		if err := inv.RecordBuild(ctx, b); err != nil {
			t.Fatal(err)
		}
	}
	read, err := inv.ReadRepositories(ctx)
	if err != nil {
		t.Fatal(err)
	}
	if len(read["builder"]) != 1 || read["builder"][0].Ref != "main" {
		t.Fatalf("the newest build's reading is %+v", read["builder"])
	}
	if _, has := read["gitea"]; has {
		t.Fatalf("a build that read nothing but its own repository reads as %+v", read["gitea"])
	}
	if _, has := read["route-proxy"]; has {
		t.Fatal("a failed build's reading was kept as what that module reads")
	}
}

// **What a build said it was made from comes back laid over what it read** (novox/hq ADR 0267): a context's
// paths on its entry, the module's own as an entry marked Own — and never in the stored `built_contexts`,
// where a controller that predates them would read an own entry as a context of its own repository.
func TestABuildsBuildSourceComesBackOverWhatItRead(t *testing.T) {
	inv := fresh(t)
	ctx := context.Background()
	said := aBuild("said", "route-proxy", "")
	said.Read = []ReadRepository{{Repository: "novox/mesh-controller", Ref: "main"}, {Repository: "novox/other"}}
	said.Sources = []BuildSource{
		{Paths: []string{"modules/route-proxy/Dockerfile", "modules/route-proxy/module.json"}},
		{Repository: "novox/mesh-controller", Ref: "main", Paths: []string{"examples/route-proxy/", "go.mod"}},
		{Repository: "novox/unread", Paths: []string{"x"}},
	}
	unsaid := aBuild("unsaid", "build-agent", "")
	unsaid.Read = []ReadRepository{{Repository: "novox/mesh-controller", Ref: "main"}}
	for _, b := range []Build{said, unsaid} {
		if err := inv.RecordBuild(ctx, b); err != nil {
			t.Fatal(err)
		}
	}
	read, err := inv.ReadRepositories(ctx)
	if err != nil {
		t.Fatal(err)
	}
	want := []ReadRepository{
		{Repository: "novox/mesh-controller", Ref: "main", Paths: []string{"examples/route-proxy/", "go.mod"}},
		{Repository: "novox/other"},
		{Paths: []string{"modules/route-proxy/Dockerfile", "modules/route-proxy/module.json"}, Own: true},
	}
	for k := range read["route-proxy"] {
		if read["route-proxy"][k].Built.IsZero() {
			t.Errorf("no build time on %+v", read["route-proxy"][k])
		}
		read["route-proxy"][k].Built, read["route-proxy"][k].Looked = time.Time{}, time.Time{}
	}
	if !reflect.DeepEqual(read["route-proxy"], want) {
		t.Fatalf("read back %+v\nwanted %+v", read["route-proxy"], want)
	}
	if got := read["build-agent"]; len(got) != 1 || got[0].Paths != nil || got[0].Own {
		t.Fatalf("a build that said no build source reads as %+v", got)
	}
	var stored string
	if err := inv.store.Pool().QueryRow(ctx, `select built_contexts::text from build where id = 'said'`).Scan(&stored); err != nil {
		t.Fatal(err)
	}
	if strings.Contains(stored, "paths") || strings.Contains(stored, "own") {
		t.Fatalf("the build source was stored among what the build read: %s", stored)
	}
}

// A build newer than the newest that worked, and failed, leaves that one's build source stale: its module is
// read whole until a build works again (novox/hq ADR 0267).
func TestAFailedNewerBuildLeavesTheBuildSourceStale(t *testing.T) {
	inv := fresh(t)
	ctx := context.Background()
	worked := aBuild("worked", "route-proxy", "")
	worked.Asked = time.Now().Add(-time.Hour)
	worked.Read = []ReadRepository{{Repository: "novox/mesh-controller", Ref: "main"}}
	worked.Sources = []BuildSource{{Paths: []string{"modules/route-proxy/module.json"}},
		{Repository: "novox/mesh-controller", Ref: "main", Paths: []string{"examples/route-proxy/"}}}
	failed := aBuild("failed", "route-proxy", "compile error")
	failed.Asked = time.Now()
	for _, b := range []Build{worked, failed} {
		if err := inv.RecordBuild(ctx, b); err != nil {
			t.Fatal(err)
		}
	}
	read, err := inv.ReadRepositories(ctx)
	if err != nil {
		t.Fatal(err)
	}
	got := read["route-proxy"]
	if len(got) != 2 || got[0].Paths != nil || got[0].Own || !got[0].Looked.After(got[0].Built) ||
		!got[1].Own || got[1].Paths != nil || got[1].Whole != "a newer build of it failed" {
		t.Fatalf("after a newer failed build the proxy reads as %+v", got)
	}
}