#  Copyright 2020 The Monogon Project Authors.
#
#  SPDX-License-Identifier: Apache-2.0
#
#  Licensed under the Apache License, Version 2.0 (the "License");
#  you may not use this file except in compliance with the License.
#  You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
#  Unless required by applicable law or agreed to in writing, software
#  distributed under the License is distributed on an "AS IS" BASIS,
#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#  See the License for the specific language governing permissions and
#  limitations under the License.

load("@bazel_gazelle//:deps.bzl", "go_repository")
load(
    "@io_bazel_rules_go//go/private:rules/rule.bzl",
    "go_rule",
)
load(
    "@io_bazel_rules_go//go:def.bzl",
    "GoLibrary",
    "go_context",
)

# Default files generated by the sqlboiler + cockroach module
SQLBOILER_FILES = [
    "boil_main_test.go",
    "boil_queries.go",
    "boil_queries_test.go",
    "boil_suites_test.go",
    "boil_table_names.go",
    "boil_types.go",
    "crdb_main_test.go",
    "crdb_suites_test.go",
    "crdb_upsert.go",
]

def _sqlboiler_impl(ctx):
    """Generate sqlboiler models from sql-migrate migrations"""

    filesn = []
    filesn += SQLBOILER_FILES

    for table in ctx.attr.tables:
        filesn += [
            "{}.go".format(table),
            "{}_test.go".format(table),
        ]

    outs = []
    for file in filesn:
        outs += [ctx.actions.declare_file(file)]

    # run_shell does not so set -euo pipefail
    command = "set -euo pipefail\n"

    # Create random db name
    command += "TMP_DB=$(cat /dev/urandom | tr -dc 'a-z' | fold -w 12 | head -n 1 ; echo)\n"
    command += "echo DB name: $TMP_DB\n"

    # Create DB and template configs
    command += "/usr/bin/psql --host localhost --port 26257 --user root -c \"CREATE DATABASE $TMP_DB;\"\n"

    command += "ln -s \"{}\" . \n".format(ctx.file.migrate_config.path)
    command += "sed -i \"s/_dbname_/$TMP_DB/g\" \"{}\" \n".format(ctx.file.migrate_config.basename)

    command += "ln -s {} . \n".format(ctx.file.boiler_config.path)
    command += "sed -i \"s/_dbname_/$TMP_DB/g\" \"{}\" \n".format(ctx.file.boiler_config.basename)

    # Copy in all sql files
    command += "mkdir migrations\n"
    for f in ctx.files.srcs:
        command += "cp \"{}\" migrations/\n".format(f.path)

    # Copy in adapter
    command += "cp \"{}\" .\n".format(ctx.file.adapter.path)

    # Apply sql-migrate
    command += "{} up --config \"{}\" \n".format(ctx.file.migrate.path, ctx.file.migrate_config.basename)

    # Run sqlboiler
    command += "{} --output \"{}\" --config \"{}\" --wipe crdb \n".format(
        ctx.file.boiler.path,
        outs[0].dirname,
        ctx.file.boiler_config.basename,
    )

    ctx.actions.run_shell(
        inputs = ctx.files.srcs + [
            ctx.file.migrate_config,
            ctx.file.boiler,
            ctx.file.adapter,
            ctx.file.migrate,
            ctx.file.boiler_config,
        ],
        outputs = outs,
        command = command,
    )

    return [DefaultInfo(files = depset(outs))]

sqlboiler = rule(
    implementation = _sqlboiler_impl,
    attrs = {
        "srcs": attr.label_list(mandatory = True, allow_files = [".sql"]),
        "tables": attr.string_list(default = []),
        "migrate_config": attr.label(allow_single_file = True, default = Label("//build/sqlboiler:dbconfig.yml")),
        "boiler_config": attr.label(allow_single_file = True, default = Label("//build/sqlboiler:sqlboiler.toml")),
        "boiler": attr.label(allow_single_file = True, default = Label("@com_github_volatiletech_sqlboiler//:sqlboiler")),
        "adapter": attr.label(allow_single_file = True, default = Label("@com_github_glerchundi_sqlboiler_crdb//:sqlboiler-crdb")),
        "migrate": attr.label(allow_single_file = True, default = Label("@com_github_rubenv_sql_migrate//sql-migrate:sql-migrate")),
    },
)

def _sqlboiler_go_impl(ctx):
    go = go_context(ctx)

    source_files = []

    # Don't include test files as they cannot be processed by go_library
    for file in ctx.attr.sqlboiler.files.to_list():
        if not "test" in file.path:
            source_files += [file]

    library = go.new_library(
        go,
        srcs = source_files,
    )
    source = go.library_to_source(go, ctx.attr, library, False)
    providers = [library, source]
    output_groups = {
        "go_generated_srcs": source_files,
    }

    return providers + [OutputGroupInfo(**output_groups)]

go_sqlboiler_library = go_rule(
    _sqlboiler_go_impl,
    attrs = {
        "sqlboiler": attr.label(providers = [DefaultInfo]),
        "importpath": attr.string(),
        "deps": attr.label_list(
            providers = [GoLibrary],
            default = [
                Label("@com_github_friendsofgo_errors//:go_default_library"),
                Label("@com_github_lib_pq//:go_default_library"),
                Label("@com_github_pkg_errors//:go_default_library"),
                Label("@com_github_spf13_viper//:go_default_library"),
                Label("@com_github_volatiletech_sqlboiler//boil:go_default_library"),
                Label("@com_github_volatiletech_sqlboiler//drivers:go_default_library"),
                Label("@com_github_volatiletech_sqlboiler//queries:go_default_library"),
                Label("@com_github_volatiletech_sqlboiler//queries/qm:go_default_library"),
                Label("@com_github_volatiletech_sqlboiler//randomize:go_default_library"),
                Label("@com_github_volatiletech_sqlboiler//strmangle:go_default_library"),
                Label("@com_github_volatiletech_sqlboiler//types:go_default_library"),
                Label("@com_github_volatiletech_sqlboiler//queries/qmhelper:go_default_library"),
                Label("@com_github_volatiletech_null//:go_default_library"),
            ],
        ),
    },
)