"""Tests for core/navigation/visual_verifier.py — OCR-anchored architecture.

Tests pure functions (normalize_text, fuzzy_match, ocr_presence_check,
build_role_confirm_prompt, parse_role_confirm_response) offline,
then verifies verify_screen_match with mock OcrClient + VlmClient.
"""

import json
import pytest
from core.navigation.visual_verifier import (
    normalize_text,
    fuzzy_match,
    ocr_presence_check,
    build_role_confirm_prompt,
    parse_role_confirm_response,
    verify_screen_match,
    verify_before,
    verify_after,
    ScreenMatchResult,
    OcrPresenceResult,
)


# ── Mock factories ─────────────────────────────────────────────────────


def mock_ocr_client_factory(tokens: list):
    """Factory that creates a mock OcrClient returning the given tokens."""
    def client(image_path: str) -> list:
        return tokens
    return client


def mock_vlm_client_factory(response_json: dict):
    """Factory that creates a mock VlmClient returning the given JSON."""
    def client(image_path: str, prompt: str) -> str:
        return json.dumps(response_json)
    return client


# ── normalize_text tests ──────────────────────────────────────────────


class TestNormalizeText:
    def test_lowercase(self):
        assert normalize_text("RECHERCHER") == "rechercher"

    def test_strip_accents(self):
        assert normalize_text("Recherché") == "recherche"

    def test_collapse_whitespace(self):
        assert normalize_text("  hello   world  ") == "hello world"

    def test_combined(self):
        assert normalize_text("  Nom Prénom  ") == "nom prenom"

    def test_empty(self):
        assert normalize_text("") == ""

    def test_numbers_preserved(self):
        assert normalize_text("IPP 12345") == "ipp 12345"


# ── fuzzy_match tests ─────────────────────────────────────────────────


class TestFuzzyMatch:
    def test_exact_match(self):
        assert fuzzy_match("Rechercher", "Rechercher") == True

    def test_case_insensitive(self):
        assert fuzzy_match("rechercher", "RECHERCHER") == True

    def test_accent_match(self):
        assert fuzzy_match("Recherché", "Recherche") == True

    def test_substring_containment(self):
        # Short text contained in longer OCR token
        assert fuzzy_match("Rechercher", "Bouton Rechercher") == True

    def test_reverse_containment(self):
        # OCR token contained in expected text
        assert fuzzy_match("Nom Prénom Patient", "Nom") == True

    def test_fuzzy_ratio(self):
        # Similar but not exact/substring — ratio ~0.90
        assert fuzzy_match("Connexion", "Connection", threshold=0.8) == True

    def test_no_match(self):
        assert fuzzy_match("Dashboard", "Login", threshold=0.8) == False

    def test_custom_threshold(self):
        # "Connection" vs "Connexion" ratio ~0.90, passes at 0.8 but fails at 0.95
        assert fuzzy_match("Connexion", "Connection", threshold=0.95) == False


# ── ocr_presence_check tests ──────────────────────────────────────────


class TestOcrPresenceCheck:
    def test_all_found(self):
        tokens = ["Rechercher", "Connexion", "Nom Patient"]
        elements = [
            {"role": "bouton", "text": "Rechercher"},
            {"role": "bouton", "text": "Connexion"},
        ]
        result = ocr_presence_check(tokens, elements)
        assert result.all_found == True
        assert result.presence_ratio == 1.0
        assert len(result.missing) == 0
        assert result.found_texts["Rechercher"] == "Rechercher"

    def test_partial_found(self):
        tokens = ["Rechercher"]
        elements = [
            {"role": "bouton", "text": "Rechercher"},
            {"role": "bouton", "text": "Connexion"},
        ]
        result = ocr_presence_check(tokens, elements)
        assert result.all_found == False
        assert result.presence_ratio == 0.5
        assert "bouton: Connexion" in result.missing

    def test_none_found(self):
        tokens = ["Accueil", "Paramètres"]
        elements = [
            {"role": "bouton", "text": "Rechercher"},
        ]
        result = ocr_presence_check(tokens, elements)
        assert result.all_found == False
        assert result.presence_ratio == 0.0
        assert "bouton: Rechercher" in result.missing

    def test_fuzzy_match_in_presence(self):
        tokens = ["Rechércher"]  # OCR with accent variation
        elements = [{"role": "bouton", "text": "Rechercher"}]
        result = ocr_presence_check(tokens, elements)
        assert result.all_found == True

    def test_empty_tokens(self):
        result = ocr_presence_check([], [{"role": "bouton", "text": "Login"}])
        assert result.all_found == False
        assert result.presence_ratio == 0.0

    def test_empty_elements(self):
        result = ocr_presence_check(["Login", "Password"], [])
        assert result.all_found == True
        assert result.presence_ratio == 1.0

    def test_no_text_key(self):
        elements = [{"role": "page"}]  # no text key
        result = ocr_presence_check(["Dashboard"], elements)
        assert result.all_found == True  # no text to check → trivially found

    def test_multiple_elements_same_text(self):
        tokens = ["Connexion"]
        elements = [
            {"role": "bouton", "text": "Connexion"},
            {"role": "label", "text": "Connexion"},
        ]
        result = ocr_presence_check(tokens, elements)
        assert result.all_found == True


# ── build_role_confirm_prompt tests ───────────────────────────────────


class TestBuildRoleConfirmPrompt:
    def test_basic_prompt(self):
        found = [
            {"text": "Rechercher", "expected_role": "bouton", "matched_ocr": "Rechercher"},
        ]
        expected = [{"role": "bouton", "text": "Rechercher"}]
        prompt = build_role_confirm_prompt(found, expected)
        assert "Text \"Rechercher\"" in prompt
        assert "expected role: bouton" in prompt
        assert "role_confirmed" in prompt

    def test_with_context(self):
        found = [
            {"text": "Connexion", "expected_role": "bouton", "matched_ocr": "Connexion"},
        ]
        expected = [{"role": "bouton", "text": "Connexion"}]
        prompt = build_role_confirm_prompt(found, expected, context="page login DPI")
        assert "Context: page login DPI" in prompt

    def test_multiple_elements(self):
        found = [
            {"text": "Login", "expected_role": "champ", "matched_ocr": "Login"},
            {"text": "Password", "expected_role": "champ", "matched_ocr": "Password"},
            {"text": "Connexion", "expected_role": "bouton", "matched_ocr": "Connexion"},
        ]
        expected = [
            {"role": "champ", "text": "Login"},
            {"role": "champ", "text": "Password"},
            {"role": "bouton", "text": "Connexion"},
        ]
        prompt = build_role_confirm_prompt(found, expected)
        assert "1." in prompt
        assert "2." in prompt
        assert "3." in prompt

    def test_no_self_declaration(self):
        """Prompt must NOT ask VLM to declare presence — only role."""
        found = [
            {"text": "Login", "expected_role": "champ", "matched_ocr": "Login"},
        ]
        expected = [{"role": "champ", "text": "Login"}]
        prompt = build_role_confirm_prompt(found, expected)
        assert "present" not in prompt.lower() or "confirmed" in prompt.lower()


# ── parse_role_confirm_response tests ─────────────────────────────────


class TestParseRoleConfirmResponse:
    def test_valid_json(self):
        data = json.dumps({
            "confirmed": [
                {"index": 1, "role_confirmed": True, "actual_role": "bouton", "confidence": 0.92},
            ],
            "overall_confidence": 0.92,
        })
        result = parse_role_confirm_response(data)
        assert len(result["confirmed"]) == 1
        assert result["overall_confidence"] == 0.92

    def test_json_in_markdown(self):
        vlm_text = "```json\n{\"confirmed\": [], \"overall_confidence\": 0.0}\n```"
        result = parse_role_confirm_response(vlm_text)
        assert result["overall_confidence"] == 0.0

    def test_garbled_response(self):
        result = parse_role_confirm_response("I cannot determine the roles")
        assert result["overall_confidence"] == 0.0
        assert len(result["confirmed"]) == 0

    def test_confidence_as_string(self):
        data = json.dumps({"confirmed": [], "overall_confidence": "0.85"})
        result = parse_role_confirm_response(data)
        assert result["overall_confidence"] == 0.85


# ── verify_screen_match (OCR-anchored) tests ─────────────────────────


class TestVerifyScreenMatchOcrAnchored:
    def test_full_match(self):
        ocr = mock_ocr_client_factory(["Rechercher", "Connexion", "Dashboard"])
        vlm = mock_vlm_client_factory({
            "confirmed": [
                {"index": 1, "role_confirmed": True, "actual_role": "bouton", "confidence": 0.92},
            ],
            "overall_confidence": 0.92,
        })
        result = verify_screen_match(
            "/tmp/test.png",
            [{"role": "bouton", "text": "Rechercher"}],
            ocr_client=ocr,
            vlm_client=vlm,
        )
        assert result.match == True
        assert result.confidence >= 0.7

    def test_ocr_presence_fail(self):
        """OCR doesn't find expected text → mismatch (deterministic, no VLM needed)."""
        ocr = mock_ocr_client_factory(["Accueil", "Paramètres"])
        vlm = mock_vlm_client_factory({})
        result = verify_screen_match(
            "/tmp/test.png",
            [{"role": "bouton", "text": "Rechercher"}],
            ocr_client=ocr,
            vlm_client=vlm,
        )
        assert result.match == False
        assert "OCR presence" in result.reason
        assert len(result.mismatches) > 0

    def test_role_not_confirmed(self):
        """OCR finds text, VLM says it's a label not a button → mismatch."""
        ocr = mock_ocr_client_factory(["Rechercher"])
        vlm = mock_vlm_client_factory({
            "confirmed": [
                {"index": 1, "role_confirmed": False, "actual_role": "label", "confidence": 0.6},
            ],
            "overall_confidence": 0.6,
        })
        result = verify_screen_match(
            "/tmp/test.png",
            [{"role": "bouton", "text": "Rechercher"}],
            ocr_client=ocr,
            vlm_client=vlm,
        )
        assert result.match == False

    def test_ocr_error(self):
        """OCR engine fails → fail-safe mismatch."""
        def failing_ocr(image_path):
            raise RuntimeError("OCR engine down")
        vlm = mock_vlm_client_factory({})
        result = verify_screen_match(
            "/tmp/test.png",
            [{"role": "bouton", "text": "Rechercher"}],
            ocr_client=failing_ocr,
            vlm_client=vlm,
        )
        assert result.match == False
        assert "OCR error" in result.reason

    def test_vlm_error_partial_match(self):
        """OCR finds texts, VLM fails → partial match (presence OK, role unknown)."""
        ocr = mock_ocr_client_factory(["Rechercher"])
        def failing_vlm(image_path, prompt):
            raise RuntimeError("VLM service down")
        result = verify_screen_match(
            "/tmp/test.png",
            [{"role": "bouton", "text": "Rechercher"}],
            ocr_client=ocr,
            vlm_client=failing_vlm,
        )
        # Presence confirmed by OCR → partial match, confidence=0.5
        assert result.match == True
        assert result.confidence == 0.5
        assert "VLM role confirm failed" in result.reason

    def test_no_expected_elements(self):
        ocr = mock_ocr_client_factory(["Login"])
        vlm = mock_vlm_client_factory({})
        result = verify_screen_match("/tmp/test.png", [], ocr_client=ocr, vlm_client=vlm)
        assert result.match == True
        assert result.confidence == 1.0

    def test_describe_match(self):
        result = ScreenMatchResult(match=True, confidence=0.92)
        assert "OK" in result.describe()

    def test_describe_mismatch(self):
        result = ScreenMatchResult(
            match=False, confidence=0.3,
            mismatches=["bouton: Rechercher"],
        )
        assert "mismatch" in result.describe()

    def test_multiple_elements_mixed(self):
        """2 elements: 1 found+role OK, 1 not found in OCR → mismatch."""
        ocr = mock_ocr_client_factory(["Connexion"])
        vlm = mock_vlm_client_factory({
            "confirmed": [
                {"index": 1, "role_confirmed": True, "actual_role": "bouton", "confidence": 0.9},
            ],
            "overall_confidence": 0.9,
        })
        result = verify_screen_match(
            "/tmp/test.png",
            [
                {"role": "bouton", "text": "Connexion"},
                {"role": "champ", "text": "Nom Patient"},
            ],
            ocr_client=ocr,
            vlm_client=vlm,
        )
        assert result.match == False  # "Nom Patient" not found by OCR

    def test_fuzzy_ocr_match(self):
        """OCR reads 'Rechércher' (accent), expected 'Rechercher' → still found."""
        ocr = mock_ocr_client_factory(["Rechércher"])
        vlm = mock_vlm_client_factory({
            "confirmed": [
                {"index": 1, "role_confirmed": True, "actual_role": "bouton", "confidence": 0.9},
            ],
            "overall_confidence": 0.9,
        })
        result = verify_screen_match(
            "/tmp/test.png",
            [{"role": "bouton", "text": "Rechercher"}],
            ocr_client=ocr,
            vlm_client=vlm,
        )
        assert result.match == True

    def test_no_text_elements_trivially_match(self):
        """Elements without text key → no presence check needed → trivially OK."""
        ocr = mock_ocr_client_factory(["Dashboard"])
        vlm = mock_vlm_client_factory({})
        result = verify_screen_match(
            "/tmp/test.png",
            [{"role": "page"}],
            ocr_client=ocr,
            vlm_client=vlm,
        )
        assert result.match == True


# ── verify_before / verify_after tests ────────────────────────────────


class TestVerifyBeforeAfter:
    def test_verify_before_match(self):
        ocr = mock_ocr_client_factory(["Login", "Password", "Connexion"])
        vlm = mock_vlm_client_factory({
            "confirmed": [
                {"index": 1, "role_confirmed": True, "actual_role": "champ", "confidence": 0.85},
            ],
            "overall_confidence": 0.85,
        })
        result = verify_before(
            "/tmp/login.png",
            [{"role": "champ", "text": "Login"}],
            ocr_client=ocr,
            vlm_client=vlm,
            context="page login",
        )
        assert result.match == True

    def test_verify_after_higher_threshold(self):
        """verify_after uses min_confidence=0.8. VLM returns 0.75 → mismatch."""
        ocr = mock_ocr_client_factory(["Dashboard"])
        vlm = mock_vlm_client_factory({
            "confirmed": [
                {"index": 1, "role_confirmed": True, "actual_role": "page", "confidence": 0.75},
            ],
            "overall_confidence": 0.75,
        })
        result = verify_after(
            "/tmp/dashboard.png",
            [{"role": "page", "text": "Dashboard"}],
            ocr_client=ocr,
            vlm_client=vlm,
        )
        # 0.75 < 0.8 threshold → role mismatch
        assert result.match == False

    def test_verify_after_passes_at_0_8(self):
        ocr = mock_ocr_client_factory(["Dashboard"])
        vlm = mock_vlm_client_factory({
            "confirmed": [
                {"index": 1, "role_confirmed": True, "actual_role": "page", "confidence": 0.85},
            ],
            "overall_confidence": 0.85,
        })
        result = verify_after(
            "/tmp/dashboard.png",
            [{"role": "page", "text": "Dashboard"}],
            ocr_client=ocr,
            vlm_client=vlm,
        )
        assert result.match == True

    def test_verify_before_ocr_missing(self):
        """Pre-action: expected text not on screen → mismatch (can't proceed)."""
        ocr = mock_ocr_client_factory(["Accueil"])
        vlm = mock_vlm_client_factory({})
        result = verify_before(
            "/tmp/page.png",
            [{"role": "bouton", "text": "Connexion"}],
            ocr_client=ocr,
            vlm_client=vlm,
            context="pre-login",
        )
        assert result.match == False
        assert "OCR presence" in result.reason


# ── OcrPresenceResult dataclass tests ─────────────────────────────────


class TestOcrPresenceResult:
    def test_presence_ratio_all_found(self):
        result = OcrPresenceResult(
            found_texts={"Login": "Login", "Password": "Password"},
            missing=[],
            all_found=True,
        )
        assert result.presence_ratio == 1.0

    def test_presence_ratio_half_found(self):
        result = OcrPresenceResult(
            found_texts={"Login": "Login", "Password": ""},
            missing=["champ: Password"],
            all_found=False,
        )
        assert result.presence_ratio == 0.5

    def test_presence_ratio_empty(self):
        result = OcrPresenceResult(
            found_texts={},
            missing=[],
            all_found=True,
        )
        assert result.presence_ratio == 1.0