# ========= 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 collections.abc import AsyncIterator

from mirage.accessor.postgres import PostgresAccessor
from mirage.cache.index import IndexCacheStore
from mirage.commands.builtin.generic.grep import grep as generic_grep
from mirage.commands.builtin.grep_helper import pattern_arg
from mirage.commands.builtin.postgres._provision import search_provision
from mirage.commands.builtin.utils.output import format_records
from mirage.commands.registry import command
from mirage.commands.spec import SPECS
from mirage.commands.spec.types import FlagView
from mirage.core.postgres.glob import resolve_glob
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("grep",
         resource="postgres",
         spec=SPECS["grep"],
         provision=search_provision)
async def grep(
    accessor: PostgresAccessor,
    paths: list[PathSpec],
    *texts: str,
    stdin: AsyncIterator[bytes] | bytes | None = None,
    prefix: str = "",
    index: IndexCacheStore = None,
    **flags: object,
) -> tuple[ByteSource | None, IOResult]:
    fl = FlagView(flags, spec=SPECS["grep"])
    pattern = pattern_arg(texts, fl)

    limit = accessor.config.default_search_limit

    if paths and pattern is not None and "\n" not in pattern:
        scope = detect_scope(paths[0])

        if scope.level != "root":
            await _stat(accessor, paths[0], index=index)

        if scope.level == "root":
            results = await search_database(accessor, pattern, 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,
                                          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, 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, 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_grep(
        resolved,
        texts,
        flags,
        readdir=_readdir,
        stat=_stat,
        read_bytes=postgres_read,
        read_stream=None,
        accessor=accessor,
        stdin=stdin,
        index=index,
    )