"""Resolver for the production release SHA. Gitea responses are local fixtures."""

from __future__ import annotations

import json
import os
import subprocess
from pathlib import Path

ROOT = Path(__file__).resolve().parents[1]
SCRIPT = ROOT / "deploy" / "resolve-release-revision.sh"
GATED = ROOT / "deploy" / "gated-paths.txt"
PYTHON = ROOT / ".venv" / "Scripts" / "python.exe"
GIT_BASH = Path(r"D:\Program Files\Git\bin\bash.exe")
BASH = str(GIT_BASH) if GIT_BASH.exists() else "bash"


def run_git(repo: Path, *args: str) -> str:
    completed = subprocess.run(
        ["git", "-c", "user.email=dev@example.com", "-c", "user.name=Release Test", *args],
        cwd=repo,
        check=True,
        capture_output=True,
        text=True,
        encoding="utf-8",
    )
    return completed.stdout.strip()


def make_repo(tmp_path: Path) -> dict[str, str]:
    repo = tmp_path / "repo"
    repo.mkdir()
    run_git(repo, "init")
    frontend = repo / "frontend"
    frontend.mkdir()
    (frontend / "app.txt").write_text("gated\n", encoding="utf-8")
    run_git(repo, "add", "frontend/app.txt")
    run_git(repo, "commit", "-m", "gated")
    first = run_git(repo, "rev-parse", "HEAD")
    docs = repo / "docs"
    docs.mkdir()
    (docs / "note.md").write_text("docs only\n", encoding="utf-8")
    run_git(repo, "add", "docs/note.md")
    run_git(repo, "commit", "-m", "docs")
    second = run_git(repo, "rev-parse", "HEAD")
    (frontend / "more.txt").write_text("more gated\n", encoding="utf-8")
    run_git(repo, "add", "frontend/more.txt")
    run_git(repo, "commit", "-m", "more gated")
    third = run_git(repo, "rev-parse", "HEAD")
    return {"repo": str(repo), "r": first, "h": second, "later": third}


def ref_payload(branch: str, sha: str) -> list[dict]:
    return [{"ref": f"refs/heads/{branch}", "object": {"sha": sha}}]


def gate_payload(sha: str, run_id: int = 42) -> dict:
    return {
        "workflow_runs": [
            {
                "id": run_id,
                "path": ".gitea/workflows/backend-quality-gate.yml",
                "head_sha": sha,
                "head_branch": "staging",
                "event": "push",
                "conclusion": "success",
            }
        ]
    }


def write_fixtures(directory: Path, manifest: list[dict], files: dict[str, object]) -> None:
    directory.mkdir()
    for name, payload in files.items():
        (directory / name).write_text(json.dumps(payload), encoding="utf-8")
    (directory / "manifest.json").write_text(json.dumps(manifest), encoding="utf-8")


def invoke(repo: str, fixture: Path, env_extra: dict[str, str]) -> subprocess.CompletedProcess[str]:
    env = os.environ.copy()
    # is-docs-only-range.sh calls python3. Windows Git bash has no python3,
    # and CreateProcess would rather hit the WSL stub than a PATH python.
    shim = fixture.parent / "python3-shim"
    shim.mkdir(exist_ok=True)
    launcher = shim / "python3"
    launcher.write_text(
        "#!/bin/bash\n" + f'exec "{PYTHON.as_posix()}" "$@"\n',
        encoding="utf-8",
        newline="\n",
    )
    env.update(
        {
            "JYOTISHA_HTTP_FIXTURE_DIR": str(fixture),
            "JYOTISHA_DOCS_ONLY_MODE": "git",
            "JYOTISHA_PYTHON": str(PYTHON),
            "GATED_PATHS_FILE": str(GATED),
            "PATH": str(shim) + os.pathsep + env.get("PATH", ""),
        }
    )
    env.update(env_extra)
    return subprocess.run(
        [BASH, str(SCRIPT)],
        cwd=repo,
        env=env,
        capture_output=True,
        text=True,
        encoding="utf-8",
    )


def outputs(completed: subprocess.CompletedProcess[str]) -> dict[str, str]:
    return dict(line.split("=", 1) for line in completed.stdout.splitlines() if "=" in line)


def test_equal_heads_pass(tmp_path: Path) -> None:
    shas = make_repo(tmp_path)
    fixture = tmp_path / "equal"
    write_fixtures(
        fixture,
        [
            {"match": "refs/heads/main", "file": "main.json"},
            {"match": "refs/heads/staging", "file": "staging.json"},
            {"match": "event=push", "file": "gate.json"},
        ],
        {
            "main.json": ref_payload("main", shas["r"]),
            "staging.json": ref_payload("staging", shas["r"]),
            "gate.json": gate_payload(shas["r"]),
        },
    )
    completed = invoke(shas["repo"], fixture, {"REQUESTED_SHA": shas["r"]})
    assert completed.returncode == 0, completed.stderr
    assert outputs(completed)["release_sha"] == shas["r"]
    assert outputs(completed)["head_sha"] == shas["r"]
    assert outputs(completed)["gate_run_id"] == "42"


def test_docs_only_advance_passes(tmp_path: Path) -> None:
    shas = make_repo(tmp_path)
    fixture = tmp_path / "docs"
    write_fixtures(
        fixture,
        [
            {"match": "refs/heads/main", "file": "main.json"},
            {"match": "refs/heads/staging", "file": "staging.json"},
            {"match": "event=push", "file": "gate.json"},
        ],
        {
            "main.json": ref_payload("main", shas["h"]),
            "staging.json": ref_payload("staging", shas["h"]),
            "gate.json": gate_payload(shas["r"], 7),
        },
    )
    completed = invoke(shas["repo"], fixture, {"REQUESTED_SHA": shas["r"]})
    assert completed.returncode == 0, completed.stderr
    assert outputs(completed)["release_sha"] == shas["r"]
    assert outputs(completed)["head_sha"] == shas["h"]
    assert outputs(completed)["gate_run_id"] == "7"


def test_gated_advance_is_refused(tmp_path: Path) -> None:
    shas = make_repo(tmp_path)
    fixture = tmp_path / "gated"
    write_fixtures(
        fixture,
        [
            {"match": "refs/heads/main", "file": "main.json"},
            {"match": "refs/heads/staging", "file": "staging.json"},
            {"match": "event=push", "file": "gate.json"},
        ],
        {
            "main.json": ref_payload("main", shas["later"]),
            "staging.json": ref_payload("staging", shas["later"]),
            "gate.json": gate_payload(shas["h"]),
        },
    )
    completed = invoke(shas["repo"], fixture, {"REQUESTED_SHA": shas["h"]})
    assert completed.returncode == 1
    assert "not a docs-only ancestor" in completed.stderr


def test_non_ancestor_is_refused(tmp_path: Path) -> None:
    shas = make_repo(tmp_path)
    fixture = tmp_path / "diverge"
    write_fixtures(
        fixture,
        [
            {"match": "refs/heads/main", "file": "main.json"},
            {"match": "refs/heads/staging", "file": "staging.json"},
            {"match": "event=push", "file": "gate.json"},
        ],
        {
            "main.json": ref_payload("main", shas["r"]),
            "staging.json": ref_payload("staging", shas["r"]),
            "gate.json": gate_payload(shas["later"]),
        },
    )
    completed = invoke(shas["repo"], fixture, {"REQUESTED_SHA": shas["later"]})
    assert completed.returncode == 1
    assert "not a docs-only ancestor" in completed.stderr


def test_missing_gate_run_is_refused(tmp_path: Path) -> None:
    shas = make_repo(tmp_path)
    fixture = tmp_path / "nogate"
    write_fixtures(
        fixture,
        [
            {"match": "refs/heads/main", "file": "main.json"},
            {"match": "refs/heads/staging", "file": "staging.json"},
            {"match": "event=push", "file": "gate.json"},
        ],
        {
            "main.json": ref_payload("main", shas["r"]),
            "staging.json": ref_payload("staging", shas["r"]),
            "gate.json": {"workflow_runs": []},
        },
    )
    completed = invoke(shas["repo"], fixture, {"REQUESTED_SHA": shas["r"]})
    assert completed.returncode == 1
    assert "no successful exact-SHA production quality gate run found" in completed.stderr


def test_divergent_main_is_refused(tmp_path: Path) -> None:
    shas = make_repo(tmp_path)
    fixture = tmp_path / "split"
    write_fixtures(
        fixture,
        [
            {"match": "refs/heads/main", "file": "main.json"},
            {"match": "refs/heads/staging", "file": "staging.json"},
        ],
        {
            "main.json": ref_payload("main", shas["r"]),
            "staging.json": ref_payload("staging", shas["h"]),
        },
    )
    completed = invoke(shas["repo"], fixture, {"REQUESTED_SHA": shas["r"]})
    assert completed.returncode == 1
    assert "main and staging must identify the same reviewed release" in completed.stderr


def test_api_failure_exits_2(tmp_path: Path) -> None:
    shas = make_repo(tmp_path)
    fixture = tmp_path / "down"
    write_fixtures(
        fixture,
        [{"match": "refs/heads/staging", "file": "unused.json", "status": 500}],
        {"unused.json": {}},
    )
    completed = invoke(shas["repo"], fixture, {"REQUESTED_SHA": shas["r"]})
    assert completed.returncode == 2
    assert "Gitea API request failed" in completed.stderr