/*
 Version Info Examples
 =====================
 
 Nightly Build Snapshot (no git tag)
  * Full Version: 3.1.0-5124
  * POM Version: 3.1.0-SNAPSHOT

 Nightly Build Snapshot (PBRIsComing branch) (no git tag)
  * Full Version: 3.1.0-PBRIsComing-5124
  * POM Version: 3.1.0-PBRIsComing-SNAPSHOT

 Alpha1 Release (git tag: v3.1-alpha1)
  * Full Version: 3.1.0-alpha1
  * POM Version: 3.1.0-alpha1
 
 Final Release (git tag: v3.1)
  * Full Version: 3.1.0
  * POM Version: 3.1.0
 */ 

import java.text.SimpleDateFormat
import org.ajoberstar.grgit.*

buildscript {
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath 'org.ajoberstar:gradle-git:1.4.1'
    }
}

ext {
    releaseInfo = null;
}

enum ReleaseType {
    Unknown,
    Snapshot,
    PreRelease,
    Release;
}

class ReleaseInfo {

    String tag;
    String version;
    String releaseName;
    ReleaseType releaseType;
    String buildDate;
    
    String branch;
    String hash;
    String shortHash;
    int revision;

    String fullVersion;
    String pomVersion;
    
    ReleaseInfo(String version, Grgit repo) {
        loadBuildDate();
        loadRepoInfo(version, repo);
    }

    ReleaseInfo(String version) {
        loadBuildDate();
        loadUnknownInfo(version);
    }

    final void loadBuildDate() {
        this.buildDate = new SimpleDateFormat("yyyy-MM-dd").format(new Date());
    }

    final void loadUnknownInfo(String version) {
        this.releaseType = ReleaseType.Unknown;
        this.version     = version;
        this.releaseName = "unknown";
        this.tag         = "";
        this.revision    = 0;
        this.branch      = "unknown";
        this.hash        = "";
        this.shortHash   = "";
        this.fullVersion = "${version}-UNKNOWN";
        this.pomVersion  = "${version}-UNKNOWN";
    }

    final void loadRepoInfo(String version, Grgit repo) {
        this.releaseType = ReleaseType.Snapshot;
        this.version     = version;

        Commit head = repo.head();
        this.revision = repo.log(includes:[head]).size();
        this.hash = head.id;
        this.shortHash = head.abbreviatedId;
        this.branch = repo.branch.current.name;

        Tag gitTag = repo.tag.list().find { it.commit == head }
        if (gitTag != null){
            this.tag = gitTag.name;
        } else {
            this.tag = "";
        }

        if (System.env.TRAVIS_BRANCH != null) {
            this.branch = System.env.TRAVIS_BRANCH
        }
        if (System.env.TRAVIS_TAG != null) {
            this.tag = System.env.TRAVIS_TAG
        }
        if (System.env.TRAVIS_PULL_REQUEST != null && System.env.TRAVIS_PULL_REQUEST != "false") {
            this.branch += "-pr-" + System.env.TRAVIS_PULL_REQUEST
        }
        
        loadTagInfo(this.tag);

        this.fullVersion = version;
        if (this.branch != "master") {
            this.fullVersion += "-${branch}";
        }

        switch (this.releaseType) {
        case ReleaseType.Snapshot:
            this.pomVersion  = "${fullVersion}-SNAPSHOT";
            this.fullVersion += "-${revision}";
            break;
        case ReleaseType.PreRelease:
            this.pomVersion  = "${fullVersion}-${releaseName}";
            this.fullVersion += "-${releaseName}";
            break;
        case ReleaseType.Release:
            this.pomVersion  = "${fullVersion}";
            break;
        }
    }

    final void loadTagInfo(String tag) {
        this.tag = tag;
        
        if (tag == null || !tag.startsWith("v")) {
            return;
        }
        
        String[] parts = tag.split("-");
        if (parts.length == 2) {
            if (parts[0].size() < 1 || parts[1].size() < 1) {
                return;
            }

            releaseType = ReleaseType.PreRelease;
            version = parts[0].substring(1);
            releaseName = parts[1];
        } else if (parts.length == 1) {
            if (parts[0].size() < 1) {
                return;
            }

            releaseType = ReleaseType.Release;
            version = parts[0];
        }
    }

    public String toString() {
        return "tag = ${tag}, base_ver = ${baseVersion}, main_ver = ${mainVersion}, " +
               "prerelease = ${prerelease}, release_name = ${releaseName}"
    }
}

task configureVersionInfo {
    try {
        def repo = Grgit.open(project.file('.'))
        releaseInfo = new ReleaseInfo(jmeVersion, repo);
        logger.warn("Full Version: ${releaseInfo.fullVersion}")
        logger.warn("POM Version: ${releaseInfo.pomVersion}")
    } catch (ex) {
        // Failed to get repo info
        logger.warn("Failed to get repository info: " + ex.message + ". " + \
                    "Only partial build info will be generated.")

        releaseInfo = new ReleaseInfo(jmeVersion);
    }
}