/*
Copyright © 2021 LUKASZ RACZYLO <lukasz$raczylo,com>

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package cmd

import (
	"fmt"
	"net/url"
	"os"
	"sort"
	"strings"
	"time"

	git "github.com/go-git/go-git/v5"
	"github.com/go-git/go-git/v5/plumbing/object"
	"github.com/lithammer/fuzzysearch/fuzzy"
	"github.com/lukaszraczylo/zero"
	"github.com/spf13/viper"
)

var (
	err  error
	repo *Setup
)

type Wording struct {
	Patch []string
	Minor []string
	Major []string
}

type Force struct {
	Patch int
	Minor int
	Major int
}

type SemVer struct {
	Patch int
	Minor int
	Major int
}

type Setup struct {
	RepositoryName      string
	RepositoryLocalPath string
	RepositoryHandler   *git.Repository
	Commits             []CommitDetails
	Semver              SemVer
	Wording             Wording
	Force               Force
	Generate            bool
	LocalConfigFile     string
}

type CommitDetails struct {
	Hash      string
	Author    string
	Message   string
	Timestamp time.Time
}

func checkMatches(content []string, targets []string) bool {
	var r []string
	for _, tgt := range targets {
		r = fuzzy.FindFold(tgt, content)
	}
	return (len(r) > 0)
}

func (s *Setup) CalculateSemver() SemVer {
	for _, commit := range s.Commits {
		s.Semver.Patch++
		commitSlice := strings.Split(commit.Message, " ")
		matchPatch := checkMatches(commitSlice, s.Wording.Patch)
		matchMinor := checkMatches(commitSlice, s.Wording.Minor)
		matchMajor := checkMatches(commitSlice, s.Wording.Major)
		if matchPatch {
			s.Semver.Patch++
			// fmt.Println("Patch version bumped:", commit.Message)
		}
		if matchMinor {
			s.Semver.Minor++
			s.Semver.Patch = 1
			// fmt.Println("Minor version bumped:", commit.Message)
		}
		if matchMajor {
			s.Semver.Major++
			s.Semver.Minor = 0
			s.Semver.Patch = 1
			// fmt.Println("Major version bumped:", commit.Message)
		}
	}
	return s.Semver
}

func (s *Setup) ListCommits() ([]CommitDetails, error) {
	ref, err := s.RepositoryHandler.Head()
	if err != nil {
		return []CommitDetails{}, err
	}
	commitsList, err := s.RepositoryHandler.Log(&git.LogOptions{From: ref.Hash(), Order: git.LogOrderBSF})
	if err != nil {
		return []CommitDetails{}, err
	}
	commitsList.ForEach(func(c *object.Commit) error {
		s.Commits = append(s.Commits, CommitDetails{Hash: c.Hash.String(), Author: c.Author.String(), Message: c.Message, Timestamp: c.Author.When})
		sort.Slice(s.Commits, func(i, j int) bool { return s.Commits[i].Timestamp.Unix() < s.Commits[j].Timestamp.Unix() })
		return nil
	})
	return s.Commits, err
}

func (s *Setup) Prepare() error {
	u, _ := url.Parse(s.RepositoryName)
	s.RepositoryLocalPath = fmt.Sprintf("/tmp/foo/%s", u.Path)
	os.RemoveAll(s.RepositoryLocalPath)
	s.RepositoryHandler, err = git.PlainClone(s.RepositoryLocalPath, false, &git.CloneOptions{
		URL: s.RepositoryName,
	})
	if err != nil {
		fmt.Println("Unable to reach repository", err.Error())
	}
	return err
}

func (s *Setup) ForcedVersioning() {
	if !zero.IsZero(s.Force.Major) {
		s.Semver.Major = s.Force.Major
	}
	if !zero.IsZero(s.Force.Minor) {
		s.Semver.Minor = s.Force.Minor
	}
	if !zero.IsZero(s.Force.Patch) {
		s.Semver.Patch = s.Force.Patch
	}
}

func (s *Setup) ReadConfig(file string) error {
	viper.SetConfigFile(file)
	err := viper.ReadInConfig()
	if err != nil {
		err = fmt.Errorf("Fatal error config file: %s \n", err)
		return err
	}
	viper.UnmarshalKey("wording", &s.Wording)
	viper.UnmarshalKey("force", &s.Force)
	return err
}

func (s *Setup) getSemver() string {
	return fmt.Sprintf("%d.%d.%d", s.Semver.Major, s.Semver.Minor, s.Semver.Patch)
}

func (s *Setup) parseFlags() {

}

func main() {
	if repo.Generate {
		err := repo.ReadConfig(repo.LocalConfigFile)
		if err != nil {
			panic(err)
		}
		err = repo.Prepare()
		if err != nil {
			panic(err)
		}
		repo.ListCommits()
		repo.ForcedVersioning()
		repo.CalculateSemver()
		fmt.Println("SEMVER", repo.getSemver())
	}
}