# ========= Copyright 2026 @ Strukto.AI All Rights Reserved. =========
# 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.
# ========= Copyright 2026 @ Strukto.AI All Rights Reserved. =========

from mirage.accessor.postgres import PostgresAccessor
from mirage.cache.index import IndexCacheStore
from mirage.commands.builtin.generic.rg import rg as generic_rg
from mirage.commands.builtin.generic_bind.adapter import bound_op
from mirage.commands.builtin.grep_helper import pattern_arg
from mirage.commands.builtin.postgres.io import resolve_glob
from mirage.commands.builtin.utils.output import format_records
from mirage.commands.errors import UsageError
from mirage.commands.registry import command
from mirage.commands.spec import SPECS
from mirage.commands.spec.types import FlagView
from mirage.core.postgres.read import read as postgres_read
from mirage.core.postgres.readdir import readdir as _readdir
from mirage.core.postgres.scope import detect_scope
from mirage.core.postgres.search import (format_grep_results, search_database,
                                         search_entity, search_kind,
                                         search_schema)
from mirage.core.postgres.stat import stat as _stat
from mirage.io.types import ByteSource, IOResult
from mirage.types import PathSpec


@command("rg", resource="postgres", spec=SPECS["rg"])
async def rg(
    accessor: PostgresAccessor,
    paths: list[PathSpec],
    *texts: str,
    stdin: ByteSource | None = None,
    prefix: str = "",
    index: IndexCacheStore,
    **flags: object,
) -> tuple[ByteSource | None, IOResult]:
    fl = FlagView(flags, spec=SPECS["rg"])
    pattern_str = pattern_arg(texts, fl)
    if pattern_str is None:
        raise UsageError("rg: usage: rg [flags] pattern [path]")

    config = accessor.config
    limit = config.default_search_limit

    # Native search takes one pattern; a newline-joined multi -e set
    # must fall through to the generic so each pattern matches (#347).
    if paths and "\n" not in pattern_str:
        scope = detect_scope(paths[0])

        if scope.level == "root":
            results = await search_database(accessor, pattern_str, limit)
            all_lines = format_grep_results(results)
            if not all_lines:
                return b"", IOResult(exit_code=1)
            return format_records(all_lines), IOResult()

        if scope.level == "schema":
            results = await search_schema(accessor, scope.schema, pattern_str,
                                          limit)
            all_lines = format_grep_results(results)
            if not all_lines:
                return b"", IOResult(exit_code=1)
            return format_records(all_lines), IOResult()

        if scope.level == "kind":
            results = await search_kind(accessor, scope.schema, scope.kind,
                                        pattern_str, limit)
            all_lines = format_grep_results(results)
            if not all_lines:
                return b"", IOResult(exit_code=1)
            return format_records(all_lines), IOResult()

        if scope.level in ("entity", "entity_rows"):
            rows = await search_entity(accessor, scope.schema, scope.kind,
                                       scope.entity, pattern_str, limit)
            if not rows:
                return b"", IOResult(exit_code=1)
            results = [(scope.schema, scope.kind, scope.entity, rows)]
            all_lines = format_grep_results(results)
            return format_records(all_lines), IOResult()

    resolved = await resolve_glob(accessor, paths,
                                  index=index) if paths else []
    return await generic_rg(
        resolved,
        texts,
        flags,
        readdir=bound_op(_readdir, accessor, index),
        stat=bound_op(_stat, accessor, index),
        read_bytes=bound_op(postgres_read, accessor, index),
        read_stream=None,
        stdin=stdin,
    )
