/*
 * Iris is a World Generator for Minecraft Servers
 * Copyright (c) 2026 Arcane Arts (Volmit Software)
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

/*
 * Shared VolmLib source resolution, applied by every Iris settings file:
 *
 *   root            settings.gradle
 *   adapters/fabric settings.gradle
 *   adapters/forge  settings.gradle
 *   adapters/neoforge settings.gradle
 *
 * Apply with an explicit File so the path never depends on the invocation directory:
 *
 *   apply from: new File(settingsDir, 'gradle/volmlib-resolution.settings.gradle')                   // root
 *   apply from: new File(settingsDir, '../../gradle/volmlib-resolution.settings.gradle').canonicalFile // adapters
 *
 * `settingsDir` resolves against the *including* build, so the upward search for a sibling
 * VolmLib checkout works from the repo root and from a nested adapter build alike.
 *
 * Behaviour:
 *   -PuseLocalVolmLib=false           disables source substitution (CI uses this).
 *   -PlocalVolmLibDirectory=<path>    explicit VolmLib checkout (relative paths resolve
 *                                     against the including build's settings directory).
 *   VOLMLIB_DIR=<path>                same, via environment.
 *   otherwise                         walk up from settingsDir looking for a `VolmLib` directory
 *                                     that contains a settings script.
 *
 * When nothing is found, or substitution is disabled, every VolmLib coordinate resolves the published
 * master-SNAPSHOT from JitPack instead, re-checked on every build like the rest of the plugin fleet.
 *
 * The outcome is logged once per top-level build and handed to the build scripts through `gradle`
 * extra properties: `volmLibDirectory` (the substituted checkout, or null) and `volmLibStamp` (the
 * content of META-INF/volmit/volmlib.properties in every shipped jar).
 */

import org.gradle.api.artifacts.Configuration
import org.gradle.process.ExecOutput

import java.io.File

boolean irisHasVolmLibSettings(File directory) {
    if (directory == null) {
        return false
    }

    new File(directory, 'settings.gradle.kts').exists() || new File(directory, 'settings.gradle').exists()
}

File irisResolveLocalVolmLibDirectory() {
    String configuredPath = providers.gradleProperty('localVolmLibDirectory')
        .orElse(providers.environmentVariable('VOLMLIB_DIR'))
        .orNull
    if (configuredPath != null && !configuredPath.isBlank()) {
        File configuredDirectory = new File(configuredPath)
        if (!configuredDirectory.isAbsolute()) {
            configuredDirectory = new File(settingsDir, configuredPath)
        }
        if (irisHasVolmLibSettings(configuredDirectory)) {
            return configuredDirectory
        }
    }

    File currentDirectory = settingsDir
    while (currentDirectory != null) {
        File candidate = new File(currentDirectory, 'VolmLib')
        if (irisHasVolmLibSettings(candidate)) {
            return candidate
        }

        currentDirectory = currentDirectory.parentFile
    }

    null
}

boolean irisUseLocalVolmLib = providers.gradleProperty('useLocalVolmLib')
    .orElse('true')
    .map { String value -> value.equalsIgnoreCase('true') }
    .get()
File irisLocalVolmLibDirectory = irisUseLocalVolmLib ? irisResolveLocalVolmLibDirectory() : null

String irisGit(File directory, String... arguments) {
    try {
        ExecOutput result = providers.exec {
            commandLine(['git', '-C', directory.absolutePath] + arguments.toList())
            ignoreExitValue = true
        }
        return result.result.get().exitValue == 0 ? result.standardOutput.asText.get().trim() : null
    } catch (Exception ignored) {
        return null
    }
}

Map<String, String> irisVolmLibStamp
String irisVolmLibDescription
if (irisLocalVolmLibDirectory == null) {
    irisVolmLibStamp = [source: 'published master-SNAPSHOT']
    irisVolmLibDescription = 'published master-SNAPSHOT'
    gradle.allprojects { Project project ->
        project.buildscript.configurations.configureEach { Configuration configuration ->
            configuration.resolutionStrategy.cacheChangingModulesFor(0, 'seconds')
        }
        project.configurations.configureEach { Configuration configuration ->
            configuration.resolutionStrategy.cacheChangingModulesFor(0, 'seconds')
        }
    }
} else {
    String commit = irisGit(irisLocalVolmLibDirectory, 'rev-parse', 'HEAD')
    String status = commit == null ? null : irisGit(irisLocalVolmLibDirectory, '--no-optional-locks', 'status', '--porcelain')
    String dirty = status == null ? 'unknown' : String.valueOf(!status.isEmpty())
    irisVolmLibStamp = [source: 'local', commit: commit ?: 'unknown', dirty: dirty]
    irisVolmLibDescription = "${irisLocalVolmLibDirectory.canonicalPath} @ ${commit == null ? 'unknown' : commit.take(7)}${dirty == 'true' ? '+dirty' : ''}"
}
gradle.extensions.extraProperties.set('volmLibDirectory', irisLocalVolmLibDirectory)
gradle.extensions.extraProperties.set('volmLibStamp', irisVolmLibStamp)
if (gradle.parent == null) {
    logger.lifecycle("VolmLib: ${irisVolmLibDescription}")
}

if (irisLocalVolmLibDirectory != null) {
    includeBuild(irisLocalVolmLibDirectory) {
        dependencySubstitution {
            substitute(module('com.github.VolmitSoftware:VolmLib')).using(project(':shared'))
            substitute(module('com.github.VolmitSoftware.VolmLib:shared')).using(project(':shared'))
            substitute(module('com.github.VolmitSoftware.VolmLib:packaging')).using(project(':packaging'))
            substitute(module('com.github.VolmitSoftware.VolmLib:volmlib-shared')).using(project(':shared'))
            substitute(module('com.github.VolmitSoftware.VolmLib:native-api')).using(project(':native-api'))
            substitute(module('com.github.VolmitSoftware.VolmLib:native-common')).using(project(':native-common'))
            substitute(module('com.github.VolmitSoftware.VolmLib:native-terrain-api')).using(project(':native-terrain-api'))
            substitute(module('com.github.VolmitSoftware.VolmLib:native-v26_2_R1')).using(project(':native:v26_2_R1'))
            substitute(module('com.github.VolmitSoftware.VolmLib:native-v26_3_R1')).using(project(':native:v26_3_R1'))
            substitute(module('com.github.VolmitSoftware.VolmLib:native-minecraft26_2-sources')).using(project(':native-minecraft26_2-sources'))
        }
    }
}