package orchestrator_test

import (
	"context"
	"orchestra/internal/continuity"
	"orchestra/internal/domain"
	"orchestra/internal/orchestrator"
	"os"
	"os/exec"
	"path/filepath"
	"testing"
)

func initRepo(t *testing.T, dir string) {
	t.Helper()
	run := func(args ...string) {
		cmd := exec.Command("git", args...)
		cmd.Dir = dir
		cmd.Env = append(os.Environ(), "GIT_AUTHOR_NAME=t", "GIT_AUTHOR_EMAIL=t@t", "GIT_COMMITTER_NAME=t", "GIT_COMMITTER_EMAIL=t@t")
		if out, err := cmd.CombinedOutput(); err != nil {
			t.Fatalf("git %v: %v: %s", args, err, out)
		}
	}
	if err := os.MkdirAll(dir, 0755); err != nil {
		t.Fatal(err)
	}
	run("init")
	if err := os.WriteFile(filepath.Join(dir, "README"), []byte("x"), 0644); err != nil {
		t.Fatal(err)
	}
	run("add", "README")
	run("commit", "-m", "init")
}

func TestPerProjectGitWorktreesResolvesByProject(t *testing.T) {
	base := t.TempDir()
	repoA := filepath.Join(base, "repo-a")
	repoB := filepath.Join(base, "repo-b")
	initRepo(t, repoA)
	initRepo(t, repoB)

	w := orchestrator.PerProjectGitWorktrees{
		Projects: map[string]orchestrator.ProjectRepo{
			"proj-a": {Repo: repoA, WorktreeRoot: filepath.Join(base, "wt-a")},
		},
		Default: orchestrator.GitWorktrees{Root: filepath.Join(base, "wt-default"), Repo: repoB},
	}

	pathA, err := w.Create(context.Background(), domain.Task{ID: "t1", Project: "proj-a"})
	if err != nil {
		t.Fatalf("create for proj-a: %v", err)
	}
	if filepath.Dir(pathA) != filepath.Join(base, "wt-a") {
		t.Fatalf("expected proj-a worktree under wt-a, got %s", pathA)
	}

	pathDefault, err := w.Create(context.Background(), domain.Task{ID: "t2", Project: "unconfigured-project"})
	if err != nil {
		t.Fatalf("create for unconfigured project: %v", err)
	}
	if filepath.Dir(pathDefault) != filepath.Join(base, "wt-default") {
		t.Fatalf("expected unconfigured project to use default worktree root, got %s", pathDefault)
	}
}

// TestGitWorktreesCommitsTaskFile guards AUDIT.md's B6: nothing wrote a
// TASK.md into a worktree in the first place, so §6.2 pickup validation had
// nothing to check. GitWorktrees.Create must now write and commit an
// immutable TASK.md whose on-disk hash matches continuity.RenderTaskFile.
func TestGitWorktreesCommitsTaskFile(t *testing.T) {
	base := t.TempDir()
	repo := filepath.Join(base, "repo")
	initRepo(t, repo)

	w := orchestrator.GitWorktrees{Root: filepath.Join(base, "wt"), Repo: repo}
	task := domain.Task{ID: "t1", Project: "p", Source: "jsonl", ExternalID: "1", Title: "do the thing"}

	path, err := w.Create(context.Background(), task)
	if err != nil {
		t.Fatalf("create: %v", err)
	}

	want := continuity.RenderTaskFile(task)
	got, err := os.ReadFile(filepath.Join(path, "TASK.md"))
	if err != nil {
		t.Fatalf("read TASK.md: %v", err)
	}
	if string(got) != string(want) {
		t.Fatalf("TASK.md content mismatch:\ngot:  %s\nwant: %s", got, want)
	}

	status, err := exec.Command("git", "-C", path, "status", "--porcelain", "--", "TASK.md").Output()
	if err != nil {
		t.Fatal(err)
	}
	if len(status) != 0 {
		t.Fatalf("TASK.md not committed, status: %s", status)
	}

	sha, err := continuity.TaskFileHash(path)
	if err != nil {
		t.Fatal(err)
	}
	if err := continuity.VerifyTaskFile(path, sha); err != nil {
		t.Fatalf("VerifyTaskFile: %v", err)
	}

	// Re-creating (path already exists) must not touch the committed file.
	path2, err := w.Create(context.Background(), task)
	if err != nil {
		t.Fatalf("recreate: %v", err)
	}
	if path2 != path {
		t.Fatalf("recreate returned different path: %s vs %s", path2, path)
	}
	got2, err := os.ReadFile(filepath.Join(path, "TASK.md"))
	if err != nil {
		t.Fatal(err)
	}
	if string(got2) != string(want) {
		t.Fatalf("TASK.md changed on recreate")
	}
}