# ========= 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 import defaultdict
from datetime import datetime, timedelta, timezone

from mirage.accessor.github import GitHubAccessor
from mirage.cache.index import IndexEntry
from mirage.core.github.config import GitHubConfig
from mirage.core.github.glob import resolve_glob as _resolve_glob
from mirage.core.github.repo import fetch_default_branch_sync
from mirage.core.github.tree import fetch_tree_sync
from mirage.core.github.tree_entry import TreeEntry
from mirage.resource.base import BaseResource
from mirage.resource.github.prompt import PROMPT
from mirage.types import ResourceName


class GitHubResource(BaseResource):

    name: str = ResourceName.GITHUB
    caches_reads: bool = True
    PROMPT: str = PROMPT

    def __init__(
        self,
        config: GitHubConfig,
        owner: str | None = None,
        repo: str | None = None,
        ref: str | None = None,
    ) -> None:
        super().__init__()
        owner = owner or config.owner
        repo = repo or config.repo
        ref = ref or config.ref
        if owner is None or repo is None:
            raise ValueError(
                "GitHubResource requires owner and repo, either as "
                "constructor kwargs or in GitHubConfig")
        default_branch = fetch_default_branch_sync(config, owner, repo)
        tree, truncated = fetch_tree_sync(config, owner, repo, ref)
        self.accessor = GitHubAccessor(config,
                                       owner,
                                       repo,
                                       ref,
                                       default_branch,
                                       truncated=truncated)
        self._populate_index_sync(tree)
        from mirage.commands.builtin.github import COMMANDS as _github_cmds
        from mirage.ops.github import OPS as _github_vfs_ops

        for fn in _github_cmds:
            self.register(fn)
        for fn in _github_vfs_ops:
            self.register_op(fn)

    def _populate_index_sync(self, tree: dict[str, TreeEntry]) -> None:
        dirs: dict[str, list[tuple[str, IndexEntry]]] = defaultdict(list)
        for path, entry in tree.items():
            parts = path.rsplit("/", 1)
            if len(parts) == 2:
                parent, name = "/" + parts[0], parts[1]
            else:
                parent, name = "/", parts[0]
            resource_type = "folder" if entry.type == "tree" else "file"
            idx_entry = IndexEntry(
                id=entry.sha,
                name=name,
                resource_type=resource_type,
                size=entry.size,
            )
            dirs[parent].append((name, idx_entry))
        for parent, entries in dirs.items():
            self._index._entries.update({
                ("/" + parent.strip("/") + "/" + name).replace("//", "/"):
                e
                for name, e in entries
            })
            child_keys = sorted(
                ("/" + parent.strip("/") + "/" + name).replace("//", "/")
                for name, _ in entries)
            self._index._children[parent] = child_keys
            self._index._expiry[parent] = (datetime.now(timezone.utc) +
                                           timedelta(days=365))

    async def resolve_glob(self, paths, prefix: str = ""):
        return await _resolve_glob(self.accessor, paths, self._index)

    @property
    def is_default_branch(self) -> bool:
        return self.accessor.ref == self.accessor.default_branch

    async def fingerprint(self, path: str) -> str | None:
        result = await self._index.get("/" + path.strip("/"))
        return result.entry.id if result.entry else None

    def get_state(self) -> dict:
        return self.config_state(
            self.accessor.config,
            owner=self.accessor.owner,
            repo=self.accessor.repo,
            ref=self.accessor.ref,
            default_branch=self.accessor.default_branch,
            truncated=self.accessor.truncated,
        )

    def load_state(self, state: dict) -> None:
        pass