import json

import pytest

from agentci.workflows.model import (
    AgentResult,
    ReviewFinding,
    ReviewReport,
    ReviewSeverity,
)
from agentci.workflows.render import (
    agent_comment,
    commit_title,
    final_comment,
    pull_request_body,
    report_for_prompt,
    required_session,
    result_comment,
    review_markdown,
)


def report() -> ReviewReport:
    return ReviewReport(
        summary="One issue remains.",
        findings=[
            ReviewFinding(
                severity=ReviewSeverity.MAJOR,
                title="Missing validation",
                detail="The empty input is not checked.",
                location="src/widget.py:12",
                recommendation="Reject empty input.",
            )
        ],
    )


def test_review_markdown_renders_user_visible_finding() -> None:
    assert review_markdown(report()) == (
        "## Remaining review findings\n\n"
        "One issue remains.\n\n"
        "### MAJOR: Missing validation \u2014 `src/widget.py:12`\n"
        "The empty input is not checked.\n\n"
        "Recommendation: Reject empty input."
    )
    assert review_markdown(ReviewReport(summary="Ready", findings=[])) == ""


def test_agent_and_final_comments_preserve_protocol_marker() -> None:
    assert agent_comment("plan", "flow-1", "Plan body") == (
        "<!-- agentci:plan workflow=flow-1 -->\nPlan body"
    )
    assert final_comment("plan", "flow-1", "Plan body", report()) == (
        f"<!-- agentci:plan workflow=flow-1 -->\nPlan body\n\n{review_markdown(report())}"
    )
    assert (
        final_comment("plan", "flow-1", "Plan body", ReviewReport(summary="Ready", findings=[]))
        == "<!-- agentci:plan workflow=flow-1 -->\nPlan body"
    )


def test_pull_request_body_and_result_comment_render_validation() -> None:
    result = AgentResult(
        summary_markdown="Implemented the widget fix.",
        tests=["pytest: passed", "ruff: passed"],
    )

    assert pull_request_body(17, result) == (
        "Closes #17\n\n"
        "## Implementation\n\nImplemented the widget fix.\n\n"
        "## Validation\n\n- pytest: passed\n- ruff: passed\n\n"
        "_Created by Agent CI._"
    )
    assert result_comment(result, sha="abc123") == (
        "## Agent result\n\nImplemented the widget fix.\n\n"
        "## Validation\n\n- pytest: passed\n- ruff: passed\n\n"
        "Commit: `abc123`"
    )


def test_renderers_report_missing_validation() -> None:
    result = AgentResult(summary_markdown="Applied the change.", tests=[])

    assert "## Validation\n\n- Not reported" in pull_request_body(2, result)
    assert result_comment(result) == (
        "## Agent result\n\nApplied the change.\n\n## Validation\n\n- Not reported"
    )


@pytest.mark.parametrize(
    ("markdown", "expected"),
    [
        ("# Fix widget\n\nDetails", "Fix widget"),
        ("\n##   Trim heading   \n", "Trim heading"),
        ("\n\t\n", "apply requested changes"),
        ("x" * 80, "x" * 72),
    ],
)
def test_commit_title_uses_first_content_line(markdown: str, expected: str) -> None:
    assert commit_title(markdown) == expected


def test_report_for_prompt_formats_json_and_preserves_unstructured_text() -> None:
    stored = '{"summary":"Ready","findings":[]}'

    formatted = report_for_prompt(stored)

    assert json.loads(formatted) == {"summary": "Ready", "findings": []}
    assert formatted == '{\n  "summary": "Ready",\n  "findings": []\n}'
    assert report_for_prompt("plain text review") == "plain text review"
    assert report_for_prompt(None) == "(none)"


def test_required_session_returns_value_or_fails_fast() -> None:
    assert required_session("session-1") == "session-1"
    with pytest.raises(RuntimeError, match="Expected a persisted OpenCode session ID"):
        required_session(None)