"""Preview and run plain Git pushes for selected repositories."""

from __future__ import annotations

from pathlib import Path
import shlex
import subprocess

from .git_state import collect_repository_snapshot
from .workspace import load_repository_specs, resolve_repo_path, resolve_workspace_root


def push_repositories(
    *,
    repos: tuple[str, ...],
    workspace_root: Path | str | None = None,
    remote: str = "origin",
    apply: bool = False,  # noqa: A002 - mirrors API field.
) -> dict[str, object]:
    workspace = resolve_workspace_root(workspace_root)
    remote = remote.strip() or "origin"
    specs = {spec.name: spec for spec in load_repository_specs(include_website=False)}
    selected = tuple(dict.fromkeys(repos))
    results: list[dict[str, object]] = []

    for repo in selected:
        spec = specs.get(repo)
        if spec is None:
            results.append({"repo": repo, "status": "blocked", "detail": "repository is not listed in repositories.json"})
            continue
        snapshot = collect_repository_snapshot(spec, workspace_root=workspace, target_tag=None, online=False)
        has_upstream = bool(snapshot.upstream)
        ahead = int(snapshot.ahead or 0)
        behind = int(snapshot.behind or 0)
        dirty_count = len(snapshot.dirty_entries)
        command = push_command(snapshot.branch, remote=remote, has_upstream=has_upstream)
        row: dict[str, object] = {
            "repo": repo,
            "cwd": snapshot.absolute_path,
            "branch": snapshot.branch,
            "upstream": snapshot.upstream,
            "head": snapshot.head,
            "ahead": ahead,
            "behind": behind,
            "dirty_count": dirty_count,
            "push_target": push_target(snapshot.branch, upstream=snapshot.upstream, remote=remote),
            "command": command_text(command),
        }
        if not snapshot.exists or not snapshot.is_git:
            results.append({**row, "status": "blocked", "detail": "repository is missing or is not a Git repository"})
            continue
        if snapshot.safe_directory_required:
            results.append({**row, "status": "blocked", "detail": "Git safe.directory approval is required"})
            continue
        if not snapshot.has_head:
            results.append({**row, "status": "blocked", "detail": "repository has no commit to push"})
            continue
        if not snapshot.branch:
            results.append({**row, "status": "blocked", "detail": "repository is not on a named branch"})
            continue
        if behind:
            results.append({**row, "status": "blocked", "detail": f"repository is behind {snapshot.upstream}"})
            continue
        if not apply:
            if has_upstream:
                status = "planned" if ahead else "noop"
                detail = (
                    f"{ahead} commit(s) will be pushed to {row['push_target']}"
                    if ahead
                    else "branch has no unpushed commits; nothing would be pushed"
                )
            else:
                status = "planned"
                detail = f"branch has no upstream; HEAD will be pushed to {row['push_target']}"
            if dirty_count:
                detail = f"{detail}; {dirty_count} dirty/untracked path(s) stay local"
            results.append({**row, "status": status, "detail": detail})
            continue
        if has_upstream and ahead == 0:
            detail = "branch has no unpushed commits; nothing was pushed"
            if dirty_count:
                detail = f"{detail}; {dirty_count} dirty/untracked path(s) stay local"
            results.append({**row, "status": "noop", "detail": detail, "command_ran": False})
            continue

        process = run(command, cwd=resolve_repo_path(spec, workspace))
        status = "pushed" if process.returncode == 0 else "failed"
        detail = (
            f"pushed {ahead} commit(s) to {row['push_target']}"
            if process.returncode == 0 and has_upstream
            else f"pushed branch to {row['push_target']}"
            if process.returncode == 0
            else "git push failed"
        )
        if process.returncode == 0 and dirty_count:
            detail = f"{detail}; {dirty_count} dirty/untracked path(s) stay local"
        results.append(
            {
                **row,
                "status": status,
                "returncode": process.returncode,
                "detail": detail,
                "command_ran": True,
                "stdout": compact_output(process.stdout),
                "stderr": compact_output(process.stderr),
            }
        )

    if any(item["status"] in {"blocked", "failed"} for item in results):
        status = "blocked" if not apply else "partial"
    elif any(item["status"] == "pushed" for item in results):
        status = "pushed"
    elif any(item["status"] == "planned" for item in results):
        status = "planned"
    else:
        status = "noop"
    return {"status": status, "apply": apply, "remote": remote, "repositories": results}


def push_command(branch: str | None, *, remote: str, has_upstream: bool) -> tuple[str, ...]:
    if has_upstream:
        return ("git", "push")
    if branch:
        return ("git", "push", "-u", remote, "HEAD")
    return ("git", "push", remote)


def push_target(branch: str | None, *, upstream: str | None, remote: str) -> str:
    if upstream:
        return upstream
    if branch:
        return f"{remote}/{branch}"
    return remote


def command_text(command: tuple[str, ...]) -> str:
    return " ".join(shlex.quote(part) for part in command)


def run(command: tuple[str, ...], *, cwd: Path) -> subprocess.CompletedProcess[str]:
    try:
        return subprocess.run(command, cwd=cwd, check=False, text=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE, timeout=120)
    except subprocess.TimeoutExpired as exc:
        return subprocess.CompletedProcess(command, 124, exc.stdout or "", exc.stderr or "git push timed out")


def compact_output(value: str) -> str:
    text = value.strip()
    return text if len(text) <= 4000 else f"{text[:4000]}\n... truncated ..."