"""Regression tests for KIN-100 — human-readable agent output format.

Verifies that reviewer.md and tester.md prompts contain the two-block format
instructions (## Verdict + ## Details), ensuring agents produce output that
is both human-readable and machine-parseable.
"""

import os

PROMPTS_DIR = os.path.join(os.path.dirname(os.path.dirname(__file__)), "agents", "prompts")


def _read_prompt(name: str) -> str:
    path = os.path.join(PROMPTS_DIR, name)
    with open(path, encoding="utf-8") as f:
        return f.read()


class TestReviewerPromptFormat:
    def test_reviewer_prompt_contains_verdict_section(self):
        content = _read_prompt("reviewer.md")
        assert "## Verdict" in content, "reviewer.md must contain '## Verdict' section"

    def test_reviewer_prompt_contains_details_section(self):
        content = _read_prompt("reviewer.md")
        assert "## Details" in content, "reviewer.md must contain '## Details' section"

    def test_reviewer_prompt_verdict_instructs_plain_russian(self):
        """Verdict section must instruct plain Russian for the project director."""
        content = _read_prompt("reviewer.md")
        assert "Russian" in content or "russian" in content, (
            "reviewer.md must mention Russian language for the Verdict section"
        )

    def test_reviewer_prompt_details_uses_json_fence(self):
        """Details section must specify JSON output in a ```json code fence."""
        content = _read_prompt("reviewer.md")
        assert "```json" in content, "reviewer.md Details section must use ```json fence"

    def test_reviewer_prompt_verdict_forbids_json(self):
        """Verdict description must explicitly say no JSON/code in that section."""
        content = _read_prompt("reviewer.md")
        # The prompt should say something like "No JSON" near the Verdict section
        assert "No JSON" in content or "no JSON" in content or "no code" in content.lower(), (
            "reviewer.md Verdict section must explicitly say no JSON/code snippets"
        )

    def test_reviewer_prompt_has_example_verdict(self):
        """Prompt must contain an example of a plain-language verdict."""
        content = _read_prompt("reviewer.md")
        # The examples in the prompt contain Russian text after ## Verdict
        assert "Реализация" in content or "проверен" in content.lower(), (
            "reviewer.md must contain a Russian-language example verdict"
        )


class TestTesterPromptFormat:
    def test_tester_prompt_contains_verdict_section(self):
        content = _read_prompt("tester.md")
        assert "## Verdict" in content, "tester.md must contain '## Verdict' section"

    def test_tester_prompt_contains_details_section(self):
        content = _read_prompt("tester.md")
        assert "## Details" in content, "tester.md must contain '## Details' section"

    def test_tester_prompt_verdict_instructs_plain_russian(self):
        content = _read_prompt("tester.md")
        assert "Russian" in content or "russian" in content, (
            "tester.md must mention Russian language for the Verdict section"
        )

    def test_tester_prompt_details_uses_json_fence(self):
        content = _read_prompt("tester.md")
        assert "```json" in content, "tester.md Details section must use ```json fence"

    def test_tester_prompt_verdict_forbids_json(self):
        content = _read_prompt("tester.md")
        assert "No JSON" in content or "no JSON" in content or "no code" in content.lower(), (
            "tester.md Verdict section must explicitly say no JSON/code snippets"
        )

    def test_tester_prompt_has_example_verdict(self):
        content = _read_prompt("tester.md")
        # The examples contain Russian text
        assert "Написано" in content or "тест" in content.lower(), (
            "tester.md must contain a Russian-language example verdict"
        )


class TestBothPromptsStructure:
    def test_reviewer_verdict_comes_before_details(self):
        """## Verdict section must appear before ## Details in reviewer.md."""
        content = _read_prompt("reviewer.md")
        verdict_pos = content.find("## Verdict")
        details_pos = content.find("## Details")
        assert verdict_pos != -1, "## Verdict must exist"
        assert details_pos != -1, "## Details must exist"
        assert verdict_pos < details_pos, "## Verdict must come before ## Details"

    def test_tester_verdict_comes_before_details(self):
        """## Verdict section must appear before ## Details in tester.md."""
        content = _read_prompt("tester.md")
        verdict_pos = content.find("## Verdict")
        details_pos = content.find("## Details")
        assert verdict_pos != -1
        assert details_pos != -1
        assert verdict_pos < details_pos, "## Verdict must come before ## Details in tester.md"

    def test_reviewer_details_status_field_documented(self):
        """Details JSON must document a 'verdict' field."""
        content = _read_prompt("reviewer.md")
        assert '"verdict"' in content, "reviewer.md Details must document 'verdict' field"

    def test_tester_details_status_field_documented(self):
        """Details JSON must document a 'status' field."""
        content = _read_prompt("tester.md")
        assert '"status"' in content, "tester.md Details must document 'status' field"