// Copyright 2022 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT

package cmd

import (
	"context"
	"errors"
	"fmt"
	"io"
	"path/filepath"
	"strings"
	"testing"

	"code.gitea.io/gitea/models/unittest"
	"code.gitea.io/gitea/modules/setting"
	"code.gitea.io/gitea/modules/test"
	"code.gitea.io/gitea/modules/util"

	"github.com/stretchr/testify/assert"
	"github.com/urfave/cli/v3"
)

func TestMain(m *testing.M) {
	unittest.MainTest(m)
}

func makePathOutput(workPath, customPath, customConf string) string {
	return fmt.Sprintf("WorkPath=%s\nCustomPath=%s\nCustomConf=%s", workPath, customPath, customConf)
}

func newTestApp(testCmd cli.Command) *cli.Command {
	app := NewMainApp(AppVersion{})
	testCmd.Name = util.IfZero(testCmd.Name, "test-cmd")
	prepareSubcommandWithGlobalFlags(&testCmd)
	app.Commands = append(app.Commands, &testCmd)
	app.DefaultCommand = testCmd.Name
	return app
}

type runResult struct {
	Stdout   string
	Stderr   string
	ExitCode int
}

func runTestApp(app *cli.Command, args ...string) (runResult, error) {
	outBuf := new(strings.Builder)
	errBuf := new(strings.Builder)
	app.Writer = outBuf
	app.ErrWriter = errBuf
	exitCode := -1
	defer test.MockVariableValue(&cli.ErrWriter, app.ErrWriter)()
	defer test.MockVariableValue(&cli.OsExiter, func(code int) {
		if exitCode == -1 {
			exitCode = code // save the exit code once and then reset the writer (to simulate the exit)
			app.Writer, app.ErrWriter, cli.ErrWriter = io.Discard, io.Discard, io.Discard
		}
	})()
	err := RunMainApp(app, args...)
	return runResult{outBuf.String(), errBuf.String(), exitCode}, err
}

func TestCliCmd(t *testing.T) {
	defaultWorkPath := filepath.Dir(setting.AppPath)
	defaultCustomPath := filepath.Join(defaultWorkPath, "custom")
	defaultCustomConf := filepath.Join(defaultCustomPath, "conf/app.ini")

	cli.CommandHelpTemplate = "(command help template)"
	cli.RootCommandHelpTemplate = "(app help template)"
	cli.SubcommandHelpTemplate = "(subcommand help template)"

	cases := []struct {
		env map[string]string
		cmd string
		exp string
	}{
		// help commands
		{
			cmd: "./gitea -h",
			exp: "DEFAULT CONFIGURATION:",
		},
		{
			cmd: "./gitea help",
			exp: "DEFAULT CONFIGURATION:",
		},

		{
			cmd: "./gitea -c /dev/null -h",
			exp: "ConfigFile: /dev/null",
		},

		{
			cmd: "./gitea -c /dev/null help",
			exp: "ConfigFile: /dev/null",
		},
		{
			cmd: "./gitea help -c /dev/null",
			exp: "ConfigFile: /dev/null",
		},

		{
			cmd: "./gitea -c /dev/null test-cmd -h",
			exp: "ConfigFile: /dev/null",
		},
		{
			cmd: "./gitea test-cmd -c /dev/null -h",
			exp: "ConfigFile: /dev/null",
		},
		{
			cmd: "./gitea test-cmd -h -c /dev/null",
			exp: "ConfigFile: /dev/null",
		},

		{
			cmd: "./gitea -c /dev/null test-cmd help",
			exp: "ConfigFile: /dev/null",
		},
		{
			cmd: "./gitea test-cmd -c /dev/null help",
			exp: "ConfigFile: /dev/null",
		},
		{
			cmd: "./gitea test-cmd help -c /dev/null",
			exp: "ConfigFile: /dev/null",
		},

		// parse paths
		{
			cmd: "./gitea test-cmd",
			exp: makePathOutput(defaultWorkPath, defaultCustomPath, defaultCustomConf),
		},
		{
			cmd: "./gitea -c /tmp/app.ini test-cmd",
			exp: makePathOutput(defaultWorkPath, defaultCustomPath, "/tmp/app.ini"),
		},
		{
			cmd: "./gitea test-cmd -c /tmp/app.ini",
			exp: makePathOutput(defaultWorkPath, defaultCustomPath, "/tmp/app.ini"),
		},
		{
			env: map[string]string{"GITEA_WORK_DIR": "/tmp"},
			cmd: "./gitea test-cmd",
			exp: makePathOutput("/tmp", "/tmp/custom", "/tmp/custom/conf/app.ini"),
		},
		{
			env: map[string]string{"GITEA_WORK_DIR": "/tmp"},
			cmd: "./gitea test-cmd --work-path /tmp/other",
			exp: makePathOutput("/tmp/other", "/tmp/other/custom", "/tmp/other/custom/conf/app.ini"),
		},
		{
			env: map[string]string{"GITEA_WORK_DIR": "/tmp"},
			cmd: "./gitea test-cmd --config /tmp/app-other.ini",
			exp: makePathOutput("/tmp", "/tmp/custom", "/tmp/app-other.ini"),
		},
	}

	for _, c := range cases {
		t.Run(c.cmd, func(t *testing.T) {
			app := newTestApp(cli.Command{
				Action: func(ctx context.Context, cmd *cli.Command) error {
					_, _ = fmt.Fprint(cmd.Root().Writer, makePathOutput(setting.AppWorkPath, setting.CustomPath, setting.CustomConf))
					return nil
				},
			})
			for k, v := range c.env {
				t.Setenv(k, v)
			}
			args := strings.Split(c.cmd, " ") // for test only, "split" is good enough
			r, err := runTestApp(app, args...)
			assert.NoError(t, err, c.cmd)
			assert.NotEmpty(t, c.exp, c.cmd)
			assert.Contains(t, r.Stdout, c.exp, c.cmd)
		})
	}
}

func TestCliCmdError(t *testing.T) {
	app := newTestApp(cli.Command{Action: func(ctx context.Context, cmd *cli.Command) error { return errors.New("normal error") }})
	r, err := runTestApp(app, "./gitea", "test-cmd")
	assert.Error(t, err)
	assert.Equal(t, 1, r.ExitCode)
	assert.Empty(t, r.Stdout)
	assert.Equal(t, "Command error: normal error\n", r.Stderr)

	app = newTestApp(cli.Command{Action: func(ctx context.Context, cmd *cli.Command) error { return cli.Exit("exit error", 2) }})
	r, err = runTestApp(app, "./gitea", "test-cmd")
	assert.Error(t, err)
	assert.Equal(t, 2, r.ExitCode)
	assert.Empty(t, r.Stdout)
	assert.Equal(t, "exit error\n", r.Stderr)

	app = newTestApp(cli.Command{Action: func(ctx context.Context, cmd *cli.Command) error { return nil }})
	r, err = runTestApp(app, "./gitea", "test-cmd", "--no-such")
	assert.Error(t, err)
	assert.Equal(t, 1, r.ExitCode)
	assert.Empty(t, r.Stdout)
	assert.Equal(t, "Incorrect Usage: flag provided but not defined: -no-such\n\n", r.Stderr)

	app = newTestApp(cli.Command{Action: func(ctx context.Context, cmd *cli.Command) error { return nil }})
	r, err = runTestApp(app, "./gitea", "test-cmd")
	assert.NoError(t, err)
	assert.Equal(t, -1, r.ExitCode) // the cli.OsExiter is not called
	assert.Empty(t, r.Stdout)
	assert.Empty(t, r.Stderr)
}

func TestCliCmdBefore(t *testing.T) {
	ctxNew := context.WithValue(context.Background(), any("key"), "value")
	configValues := map[string]string{}
	setting.CustomConf = "/tmp/any.ini"
	var actionCtx context.Context
	app := newTestApp(cli.Command{
		Before: func(context.Context, *cli.Command) (context.Context, error) {
			configValues["before"] = setting.CustomConf
			return ctxNew, nil
		},
		Action: func(ctx context.Context, cmd *cli.Command) error {
			configValues["action"] = setting.CustomConf
			actionCtx = ctx
			return nil
		},
	})
	_, err := runTestApp(app, "./gitea", "--config", "/dev/null", "test-cmd")
	assert.NoError(t, err)
	assert.Equal(t, ctxNew, actionCtx)
	assert.Equal(t, "/tmp/any.ini", configValues["before"], "BeforeFunc must be called before preparing config")
	assert.Equal(t, "/dev/null", configValues["action"])
}