package main

import (
	"errors"
	"fmt"
	"net/url"
	"os/exec"
	"path/filepath"
	"strconv"
	"strings"
)

type AppModule struct {
	Name   string
	Folder string
	CheckS string
}

type AppModuleConfig struct {
	Name     string  `yaml:"name"`
	CheckUrl *string `yaml:"check-url"`
}

type Script struct {
	Name    string
	AbsPath string
	Runner  ScriptRunner
}

func (s *Script) Run() (string, error) {
	args := runnerArgs(s.Runner.Runner, s.AbsPath)
	if len(args) == 0 {
		return "", errors.New("runner command is empty")
	}

	cmd := exec.Command(args[0], args[1:]...)
	output, err := cmd.CombinedOutput()
	return string(output), err
}

func runnerArgs(template string, scriptPath string) []string {
	fields := strings.Fields(template)
	for i, field := range fields {
		fields[i] = strings.ReplaceAll(field, "%v", scriptPath)
	}
	return fields
}

func (m *AppModule) HasScript(name string, subfolder *string) (bool, *Script) {
	folder := m.Folder
	if subfolder != nil {
		folder = filepath.Join(folder, *subfolder)
	}

	for _, r := range runners {
		ext := r.Extension
		if ext != "" && !strings.HasPrefix(ext, ".") {
			ext = "." + ext
		}

		scriptPath := filepath.Join(folder, name+ext)
		if fileExists(scriptPath) {
			abs, err := filepath.Abs(scriptPath)
			if err != nil {
				return false, nil
			}
			return true, &Script{Name: name, AbsPath: abs, Runner: r}
		}
	}
	return false, nil
}
func (m *AppModule) Check() (bool, string, error) {
	if strings.HasPrefix(m.CheckS, "URL ") {
		check := strings.Split(m.CheckS, " ")[1:]
		if len(check) < 1 || len(check) > 3 {
			return false, "", errors.New("check url is bad")
		}
		checkUrl := check[0]
		code := ""
		if len(check) > 1 {
			code = check[1]
		}
		body := ""
		if len(check) > 2 {
			dBody, err := url.QueryUnescape(check[2])
			if err != nil {
				return false, "", errors.New("check body decode failed")
			}
			body = dBody
		}

		cCode, cBody, err := fetch(checkUrl, defaultFetchTimeout)
		if err != nil {
			return false, "", err
		}
		if code != "" && strconv.Itoa(cCode) != code {
			return false, "", fmt.Errorf("code is different: expected %s, got %d", code, cCode)
		}
		if body != "" && body != cBody {
			return false, "", errors.New("body is different")
		}

		return true, "", nil

	} else {
		exists, script := m.HasScript("check", nil)
		if exists && script != nil {
			output, err := script.Run()
			if err != nil {
				return false, output, err
			} else {
				return true, output, nil
			}
		} else {
			return false, "", errors.New("check script not found")
		}
	}
}

func (m *AppModule) Start() (string, error) {
	exists, script := m.HasScript("start", nil)
	if exists && script != nil {
		return script.Run()
	} else {
		return "", errors.New("start script not found")
	}
}

func (m *AppModule) Stop() (string, error) {
	exists, script := m.HasScript("stop", nil)
	if exists && script != nil {
		return script.Run()
	} else {
		return "", errors.New("stop script not found")
	}
}

func (m *AppModule) Restart() (string, error) {
	exists, script := m.HasScript("restart", nil)
	if exists && script != nil {
		return script.Run()
	} else {
		stopOutput, err := m.Stop()
		if err != nil {
			return stopOutput, err
		}
		startOutput, err := m.Start()
		return joinOutput(stopOutput, startOutput), err
	}

}

func (m *AppModule) Fix() (string, error) {
	exists, script := m.HasScript("fix", nil)

	if exists && script != nil {
		return script.Run()
	} else {
		return m.Restart()
	}
}

func (m *AppModule) Run(scriptN string) (string, error) {
	var sub = "run"
	exists, script := m.HasScript(scriptN, &sub)

	if exists && script != nil {
		return script.Run()
	} else {
		return "", errors.New("run script not found")
	}
}

type Application struct {
	Name       string
	Folder     string
	AppModules []AppModule
}

type AppConfig struct {
	Name string `yaml:"name"`
}