import os.path
import sys

from functions import getCommitList
from rawcommit import RawCommit
from commit import Commit
from scope import Scope
from commitBody import CommitBody


# Compute user input of repository path via console
inputPath = input("Please enter the base path of the repository: ").strip()
userDecision = input("Should the generated changelog be stored in another location (y/n)? ").lower().strip()
if userDecision == "y":
    outputPath = input("Please enter the output path: ").strip()
elif userDecision == "n":
    print("The changelog will be stored in the same location as the repository.")
    outputPath = inputPath
else:
    print("invalid input")
    sys.exit(1)


# create a list of separate commits in chronological order (new to old)
commitHistory = getCommitList(inputPath)


# Create a two-dimensional list by tags: [[tag, [commits]],[tag, [commits]],...]
taggedHistory = []
for commit in commitHistory:
    if commit.tag.tagAsString:
        taggedHistory.append([commit.tag, commit])
    else:
        if len(taggedHistory) == 0:
            taggedHistory.append([None, commit])
        else:
            taggedHistory[-1].append(commit)


# Construction of the changelog-file
fileTemplate = ["# Changelog"]
for tag in taggedHistory:
    ## If latest commit has no tag:
    if not tag[0]:
        fileTemplate.append("\n## Without version number")
    else:
        fileTemplate.append("\n## Version " + tag[0].tagAsString)


    ## Grouping by Type
    featType = ["Features"]
    fixType = ["Fixes"]
    otherType = ["Other"]
    nonconformCommits = []
    
    for commit in tag[1:]:
        if commit.body.commitType == CommitBody.commitTypes[5]: # fix
            fixType.append(commit)
        elif commit.body.commitType == CommitBody.commitTypes[4]: # feat
            featType.append(commit)
        elif commit.body.commitType == "nonconform":
            nonconformCommits.append(commit)
        else:
            otherType.append(commit)

    ## Sub-Grouping by Scopes within Types    
    commitlistByType = [featType, fixType, otherType]
    for commitsByType in commitlistByType:
        if len(commitsByType) == 1:
            continue
        commitlistByScope = {}
        noScope = []
        for commit in commitsByType:
            if type(commit) == str:
                continue
            if commit.body.scope == None:
                noScope.append(commit)
            elif commit.body.scope in commitlistByScope:
                commitlistByScope[commit.body.scope].append(commit)
            else:
                commitlistByScope[commit.body.scope] = [commit]
        
        fileTemplate.append("\n### " + commitsByType[0])
        while len(commitlistByScope) > 0:
            scope, commits = commitlistByScope.popitem()
            fileTemplate.append("- *" + str(scope) + "*")
            for commit in commits:
                if commitsByType[0] == "Other":
                    fileTemplate.append("    - (" + commit.body.commitType + ") " + commit.body.subject + commit.appendShortHash())
                else:
                    fileTemplate.append("    - " + commit.body.subject + commit.appendShortHash())
        if len(noScope) > 0:
            fileTemplate.append("- *no scope*")
        for commit in noScope:
            fileTemplate.append("    - " + commit.body.subject + commit.appendShortHash())
    
    ## nonconform commits
    if len(nonconformCommits) > 0:
        fileTemplate.append("\n### Non-conform commits")
        for commit in nonconformCommits:
            fileTemplate.append("- " + commit.body.subject + commit.appendShortHash())


# write into changelog.md file
with open(outputPath + "/changelog.md", "w") as file:
    for line in fileTemplate:
        file.write(line + "\n")