package main

import (
	"io"
	"strings"
	"testing"

	"github.com/spf13/cobra"
)

// A malformed --repo must fail the command (so main exits non-zero). ParseRepo
// rejects it before any Vault/Gitea call, so this stays hermetic.
func TestExecuteBadRepoErrors(t *testing.T) {
	cmd := newRootCmd()
	cmd.SetArgs([]string{"pr", "create", "--repo", "not-a-repo", "--base", "main", "--head", "x", "--title", "t"})
	cmd.SetOut(io.Discard)
	cmd.SetErr(io.Discard)
	if err := cmd.Execute(); err == nil {
		t.Fatal("Execute() = nil, want error for a malformed --repo")
	}
}

// `pr edit` with neither --title nor --body has nothing to send; it must fail
// with a usage error before any Vault/Gitea call, so this stays hermetic.
func TestPREditRequiresTitleOrBody(t *testing.T) {
	cmd := newRootCmd()
	cmd.SetArgs([]string{"pr", "edit", "--repo", "unkin/repo", "--pr", "7"})
	cmd.SetOut(io.Discard)
	cmd.SetErr(io.Discard)
	err := cmd.Execute()
	if err == nil {
		t.Fatal("Execute() = nil, want an error when neither --title nor --body is given")
	}
	if !strings.Contains(err.Error(), "--title or --body") {
		t.Errorf("error = %q, want it to name the missing flags", err)
	}
}

// Gitea silently ignores an empty title, so `pr edit --title ""` would report
// success while changing nothing; it must fail before any Vault/Gitea call.
func TestPREditRejectsEmptyTitle(t *testing.T) {
	cmd := newRootCmd()
	cmd.SetArgs([]string{"pr", "edit", "--repo", "unkin/repo", "--pr", "7", "--title", ""})
	cmd.SetOut(io.Discard)
	cmd.SetErr(io.Discard)
	err := cmd.Execute()
	if err == nil {
		t.Fatal("Execute() = nil, want an error for an empty --title")
	}
	if !strings.Contains(err.Error(), "--title cannot be empty") {
		t.Errorf("error = %q, want it to reject the empty title", err)
	}
}

// execute runs the command tree with args, discarding output, so tests assert
// on the error alone. Every case here fails before any Vault/Gitea call.
func execute(args ...string) error {
	cmd := newRootCmd()
	cmd.SetArgs(args)
	cmd.SetOut(io.Discard)
	cmd.SetErr(io.Discard)
	return cmd.Execute()
}

// An issue needs a title; Gitea rejects an empty one, so the command must too.
func TestIssueCreateRequiresTitle(t *testing.T) {
	err := execute("issue", "create", "--repo", "unkin/repo", "--body", "b")
	if err == nil {
		t.Fatal("Execute() = nil, want an error when --title is missing")
	}
	if !strings.Contains(err.Error(), "--title is required") {
		t.Errorf("error = %q, want it to name the missing flag", err)
	}
}

// --repo is required, and cobra must reject its absence before anything reaches
// for a token.
func TestIssueCreateRequiresRepo(t *testing.T) {
	err := execute("issue", "create", "--title", "t")
	if err == nil {
		t.Fatal("Execute() = nil, want an error when --repo is missing")
	}
	if !strings.Contains(err.Error(), "repo") {
		t.Errorf("error = %q, want it to name the missing flag", err)
	}
}

func TestIssueCreateBadRepoErrors(t *testing.T) {
	if err := execute("issue", "create", "--repo", "not-a-repo", "--title", "t"); err == nil {
		t.Fatal("Execute() = nil, want error for a malformed --repo")
	}
}

// `issue comment` addresses the issue by --issue, not --pr, and needs it.
func TestIssueCommentRequiresIssueNumber(t *testing.T) {
	err := execute("issue", "comment", "--repo", "unkin/repo", "--body", "hi")
	if err == nil {
		t.Fatal("Execute() = nil, want an error when --issue is missing")
	}
	if !strings.Contains(err.Error(), "issue") {
		t.Errorf("error = %q, want it to name the missing --issue flag", err)
	}
}

func TestIssueEditRequiresTitleOrBody(t *testing.T) {
	err := execute("issue", "edit", "--repo", "unkin/repo", "--issue", "12")
	if err == nil {
		t.Fatal("Execute() = nil, want an error when neither --title nor --body is given")
	}
	if !strings.Contains(err.Error(), "--title or --body") {
		t.Errorf("error = %q, want it to name the missing flags", err)
	}
}

func TestIssueEditRejectsEmptyTitle(t *testing.T) {
	err := execute("issue", "edit", "--repo", "unkin/repo", "--issue", "12", "--title", "")
	if err == nil {
		t.Fatal("Execute() = nil, want an error for an empty --title")
	}
	if !strings.Contains(err.Error(), "--title cannot be empty") {
		t.Errorf("error = %q, want it to reject the empty title", err)
	}
}

// PRs and issues share Gitea's comment endpoint, so both comment commands are
// built from one constructor: they must stay identical apart from the flag
// naming the number.
func TestCommentCommandsStayInStep(t *testing.T) {
	find := func(group string) *cobra.Command {
		t.Helper()
		cmd, _, err := newRootCmd().Find([]string{group, "comment"})
		if err != nil || cmd.Name() != "comment" {
			t.Fatalf("%s comment not found: %v", group, err)
		}
		return cmd
	}
	has := func(cmd *cobra.Command, name string) bool { return cmd.Flags().Lookup(name) != nil }

	prCmd, issueCmd := find("pr"), find("issue")
	for _, name := range []string{"repo", "body"} {
		if !has(prCmd, name) || !has(issueCmd, name) {
			t.Errorf("--%s missing: pr=%t issue=%t", name, has(prCmd, name), has(issueCmd, name))
		}
	}
	if !has(prCmd, "pr") || has(prCmd, "issue") {
		t.Error("pr comment must take --pr and only --pr")
	}
	if !has(issueCmd, "issue") || has(issueCmd, "pr") {
		t.Error("issue comment must take --issue and only --issue")
	}
}