package projecttxt

import (
	"fmt"
	"sort"
	"strings"
)

type Project struct {
	Id             int               `json:"id"`        // Internal project id
	Original       string            `json:"original"`  // Original raw project text
	Name           string            `json:"name"`      // The name of the project
	Directory      string            `json:"directory"` // The directory part of the project text
	Notes          string            `json:"notes"`     // The filename of the notes file, defaults to Directory+/+notes.md
	Repo           string            `json:"repo"`      // The directory to the git repository, defaults to Directory+/+Name
	Contexts       []string          `json:"contexts"`
	ProjectTags    []string          `json:"projectTags"`
	AdditionalTags map[string]string `json:"additionalTags"`
}

// ParseProject parses the input text string into a Project struct
func ParseProject(text string) (*Project, error) {
	var err error
	project := Project{
		AdditionalTags: make(map[string]string),
	}
	project.Original = strings.Trim(text, "\t\n\r ")
	parts := getParts(project.Original)
	//parts := strings.Fields(project.Original)
	var pIdx int
	for pIdx = range parts {
		if partIsSpecial(parts[pIdx]) {
			break
		}
		project.Name = project.Name + " " + parts[pIdx]
	}
	project.Name = strings.TrimSpace(project.Name)
	parts = parts[pIdx:]
	var notesAbs, repoAbs bool
	project.Notes = "notes.md"
	project.Repo = project.Name
	for _, v := range parts {
		switch v[0] {
		case '^': // Project Directory
			project.Directory = v[1:]
			if strings.HasSuffix(project.Directory, "/") {
				project.Directory = strings.TrimSuffix(project.Directory, "/")
			}
		case '~': // Project Repo
			project.Repo = v[1:]
			if strings.HasPrefix(project.Repo, "/") {
				repoAbs = true
			}
		case '#':
			project.Notes = v[1:]
			if strings.HasPrefix(project.Notes, "/") {
				notesAbs = true
			}
		case '@': // Contexts
			project.Contexts = append(project.Contexts, v[1:])
		case '+': // ProjectTags
			project.ProjectTags = append(project.ProjectTags, v[1:])
		default:
			if strings.Contains(v, ":") {
				// Additional Tags
				tagPts := strings.Split(v, ":")
				if tagPts[0] != "" && tagPts[1] != "" {
					project.AdditionalTags[tagPts[0]] = tagPts[1]
				}
			}
		}
	}
	if !notesAbs {
		project.Notes = fmt.Sprintf("%s/%s", project.Directory, project.Notes)
	}
	if !repoAbs {
		project.Repo = fmt.Sprintf("%s/%s", project.Directory, project.Repo)
	}
	return &project, err
}

func partIsSpecial(pt string) bool {
	if len(pt) == 0 {
		return false
	}
	switch pt[0] {
	case '^', '~', '#', '@', '+':
		return true
	default:
		return false
	}
}

// getParts parses the text from text pulling out each part.
// By default it splits on spaces, the only exception is if we find a double-quote
func getParts(text string) []string {
	var ret []string
	var wrk string
	quoteStart := -1
	for i := range text {
		if quoteStart >= 0 {
			if text[i] == '"' {
				quoteStart = -1
				ret = append(ret, wrk)
			} else {
				wrk = wrk + string(text[i])
			}
		} else {
			switch text[i] {
			case '"':
				quoteStart = i
			case ' ':
				if len(wrk) > 0 {
					ret = append(ret, wrk)
				}
				wrk = ""
			default:
				wrk = wrk + string(text[i])
			}
		}
	}
	if len(wrk) > 0 {
		ret = append(ret, wrk)
	}
	return ret
}

// String returns a complete project string in project.txt format.
//
// Contexts, ProjectTags, and Additional Tags are alphabetically sorted,
// and appended at the end in the following order:
// Contexts, ProjectTags, Tags
//
// For example:
// Project.txt ^/home/user/projects/projecttxt @personal +projectxt contact:"Frank Workman" "Address 1":"1234 Work Place"
func (project Project) String() string {
	text := fmt.Sprintf("%s ", project.Name)
	text += fmt.Sprintf("^%s ", project.Directory)
	if project.Repo != "" {
		text += fmt.Sprintf("~%s ", project.Repo)
	}
	if project.Notes != "" {
		text += fmt.Sprintf("#%s ", project.Notes)
	}
	if len(project.Contexts) > 0 {
		sort.Strings(project.Contexts)
		for _, context := range project.Contexts {
			text += fmt.Sprintf("@%s ", context)
		}
	}
	if len(project.ProjectTags) > 0 {
		sort.Strings(project.ProjectTags)
		for _, pTag := range project.ProjectTags {
			text += fmt.Sprintf("+%s ", pTag)
		}
	}
	if len(project.AdditionalTags) > 0 {
		keys := make([]string, 0, len(project.AdditionalTags))
		for key := range project.AdditionalTags {
			keys = append(keys, key)
		}
		sort.Strings(keys)
		for _, key := range keys {
			text += fmt.Sprintf("%s:%s ", key, project.AdditionalTags[key])
		}
	}
	return text
}

func (project *Project) HasContext(context string) bool {
	for _, v := range project.Contexts {
		if v == context {
			return true
		}
	}
	return false
}

func (project *Project) GetContextsString() string {
	var text string
	sort.Strings(project.Contexts)
	for _, context := range project.Contexts {
		text += fmt.Sprintf("%s ", context)
	}
	return text
}

func (project *Project) HasProjectTag(projectTag string) bool {
	for _, v := range project.ProjectTags {
		if v == projectTag {
			return true
		}
	}
	return false
}

func (project *Project) GetProjectsString() string {
	var text string
	sort.Strings(project.ProjectTags)
	for _, pTag := range project.ProjectTags {
		text += fmt.Sprintf("%s ", pTag)
	}
	return text
}

func (project *Project) SetTag(name, val string) {
	project.AdditionalTags[name] = val
}

func (project *Project) HasTag(name string) bool {
	_, ok := project.AdditionalTags[name]
	return ok
}

func (project *Project) GetTag(name string) string {
	return project.AdditionalTags[name]
}

func (project *Project) GetTagsString() string {
	var text string
	keys := make([]string, 0, len(project.AdditionalTags))
	for key := range project.AdditionalTags {
		keys = append(keys, key)
	}
	sort.Strings(keys)
	for _, key := range keys {
		text += fmt.Sprintf("%s:%s ; ", key, project.AdditionalTags[key])
	}
	return text
}