#compdef gradle gradlew

local -i ret=1
local curcontext="$curcontext" state state_descr outputline
local gradle_inspect=yes gradle_buildfile cache_policy cache_name tag_order filter
local -A opt_args task_map
local -aU gradle_subprojects gradle_tasks tasks
local -a match mbegin mend

_gradle_caching_policy() {
    # Invalidate the cache if it cannot be read.
    [[ -r "$1" ]] ||
            return 0

    # Invalidate the cache if it's older than the build file.
    [[ $gradle_buildfile -nt $1 ]] &&
            return

    # Invalidate the cache if it doesn't contain the required arrays.
    local cache="$( < $1 )"
    [[ "$cache" != *'gradle_subprojects=('*')'* || "$cache" != *'gradle_tasks=('*')'* ]]
}

zstyle -s ":completion:*:*:$service:*" cache-policy cache_policy || \
    zstyle ":completion:*:*:$service:*" cache-policy _gradle_caching_policy

# By default, we only complete main tasks (belonging to a group). Secondary tasks are
# completed if no main tasks are found.
zstyle -a ":completion:*:*:$service:*" tag-order tag_order || \
    zstyle ":completion:*:*:$service:*" tag-order 'gradle_group' 'gradle_all'

# The completion inspects the current build file to find tasks to complete. Setting
# this style to 'no' or 'false' turns off inspection. In that case only the built-in tasks
# are completed.
zstyle -T ":completion:*:*:$service:*" gradle-inspect || gradle_inspect=no

_arguments -C \
    '(-)'{-\?,-h,--help}'[Shows a help message.]' \
    {-a,--no-rebuild}'[Do not rebuild project dependencies.]' \
    {-b,--build-file}'[Specifies the build file.]:build file:_files -g "*.gradle(-.)"' \
    {-C,--cache}'[Specifies how compiled build scripts should be cached.]:cache policy:(on rebuild)' \
    {-c,--settings-file}'[Specifies the settings file.]:settings file:_files -g "*.properties(-.)"' \
    '--continue[Continues task execution after a task failure.]' \
    \*{-D+,--system-prop}'[Set system property of the JVM (e.g. -Dmyprop=myvalue).]:system property (prop=val):' \
    '(-i --info -q --quiet)'{-d,--debug}'[Log in debug mode (includes normal stacktrace).]' \
    '(--nodaemon)--daemon[Uses the Gradle daemon to run the build. Starts the daemon if not running.]' \
    '--foreground[Starts the Gradle daemon in the foreground.]' \
    {-g,--gradle-user-home}'[Specifies the gradle user home directory.]:home directory:_directories' \
    '(-)--gui[Launches the Gradle GUI.]' \
    {-I,--init-script}'[Specifies an initialization script.]:init script:_files -g "*.gradle(-.)"' \
    '(-d --debug -q --quiet)'{-i,--info}'[Set log level to info.]' \
    {-m,--dry-run}'[Runs the builds with all task actions disabled.]' \
    '--no-color[Do not use color in the console output.]' \
    '(--daemon)--no-daemon[Do not use the Gradle daemon to run the build.]' \
    '--no-opt[Ignore any task optimization.]' \
    '--offline[The build should operate without accessing network resources.]' \
    \*{-P+,--project-prop}'[Set project property for the build script (e.g. -Pmyprop=myvalue).]:project property (prop=val):' \
    {-p,--project-dir}'[Specifies the start directory for Gradle.]:start directory:_directories' \
    '--parallel[Build projects in parallel. Gradle will attempt to determine the optimal number of executor threads to use.]' \
    '--parallel-threads[Build projects in parallel, using the specified number of executor threads.]' \
    '--profile[Profiles build execution time and generates a report in the <build_dir>/reports/profile directory.]' \
    '--project-cache-dir[Specifies the project-specific cache directory.]:cache directory:_directories' \
    '(-d --debug -i --info)'{-q,--quiet}'[Log errors only.]' \
    '--recompile-scripts[Force build script recompiling.]' \
    '--refresh[Refresh the state of resources of the type(s) specified.]:refresh policy:(dependencies)' \
    '--refresh-dependencies[Refresh the state of dependencies.]' \
    '--rerun-tasks[Ignore previously cached task results.]' \
    '(-S --full-stacktrace)'{-s,--stacktrace}'[Print out the stacktrace for all exceptions.]' \
    '(-s --stacktrace)'{-S,--full-stacktrace}'[Print out the full (very verbose) stacktrace for all exceptions.]' \
    '(-)--stop[Stops the Gradle daemon if it is running.]' \
    {-u,--no-search-upward}"[Don't search in parent folders for a settings.gradle file.]" \
    '(-)'{-v,--version}'[Print version info.]' \
    {-x,--exclude-task}'[Specify a task to be excluded from execution.]:task to exclude:->task' \
    '*:task:->task' \
    && ret=0

if [[ $state == task && ! -prefix - ]]; then
    # :<task> runs <task> in the root project only.
    # :<subproject>:<task> is the same as <subproject>:<task> (without the leading colon).
    compset -P \:

    if [[ $gradle_inspect == yes ]]; then
        # If a build file is specified after '-b' or '--build-file', use this file. Otherwise,
        # default is the file 'build.gradle' in the current directory.
        gradle_buildfile=${${(v)opt_args[(i)-b|--build-file]}:-build.gradle}

        if [[ -f $gradle_buildfile ]]; then
            # Cache name is constructed from the absolute path of the build file.
            cache_name=${${gradle_buildfile:a}//[^[:alnum:]]/_}

            if _cache_invalid $cache_name || ! _retrieve_cache $cache_name; then
                zle -R "Generating cache from $gradle_buildfile"

                # Run gradle/gradlew and retrieve possible tasks.
                for outputline in ${(f)"$($words[1] --build-file $gradle_buildfile -q tasks --all)"}; do

                    # Tasks and subprojects each start with a lowercase letter, but whereas tasks are in camelCase, each
                    # subproject consists of one or more sections of kebab-case, with each section ending in a ':'.
                    # A subproject task is a task prefixed with a subproject and runs in that project only.
                    # Specifying a task without a subproject prefix runs the task in all subprojects where it exists.
                    # Tasks prefixed by whitespace are dependencies of the task above them and should be ignored.
                    if [[ $outputline == (#b)([[:lower:]][-[:lower:][:digit:]]#\:)#([[:lower:]][[:alnum:]]#)(|' - '*) ]]
                    then
                        task=$match[-2]
                        task_descr=${match[-1]# - }
                        shift -p 2 match
                        subproject=${(j::)match//:/'\:'}

                        if [[ -n $subproject ]]; then
                            gradle_subprojects+=( ${subproject%'\:'} )
                            task_map[$subproject$task]=$task_descr

                            # We cannot count on the description of a subproject task to be representative of the task
                            # in general.
                            : ${task_map[$task]=}
                        else
                            task_map[$task]=$task_descr
                        fi
                    fi
                done
                printf -v gradle_tasks '%s:%s' "${(kv@)task_map}"
                _store_cache $cache_name gradle_subprojects gradle_tasks
            fi

            if [[ $IPREFIX == *: ]] || ! zstyle -T ":completion:${curcontext}:subprojects" prefix-needed; then
                _describe -t subprojects 'gradle subproject' gradle_subprojects -S \: &&
                        ret=0
            fi
            if [[ $PREFIX == *:* ]] || ! zstyle -T ":completion:${curcontext}:tasks" prefix-needed; then
                tasks=( $gradle_tasks[@] )
            else
                # If no subproject is specified, then filter out all subproject tasks.
                tasks=( ${gradle_tasks[@]:#*'\:'*} )
            fi
            _describe -t tasks 'gradle task' tasks &&
                    ret=0
        fi
    else
        _describe -t tasks 'built-in task' '(
            "dependencies:Displays all dependencies declared in root project."
            "dependencyInsight:Displays the insight into a specific dependency in root project."
            "help:Displays a help message."
            "projects:Displays the sub-projects of root project."
            "properties:Displays the properties of root project."
            "tasks:Displays the tasks runnable from root project."
            )' && ret=0
    fi
fi

return ret
