import json
from pathlib import Path
from typing import Any

START_MARKER = "/*WellFargoProprietary%"
END_MARKER = "%WellFargoProprietary*/"


class WellsFargoPayloadExtractor:
    """Extract wrapped WellFargo payloads from HAR entries and parse them as JSON."""

    def __init__(self) -> None:
        self.objects: list[Any] = []
        self.errors: list[str] = []

    def _normalize_text(self, raw_text: Any) -> str | None:
        """Return a normalized text payload or None when input is not a string."""
        if not isinstance(raw_text, str):
            return None

        text = raw_text.strip()

        # Some HAR exports store content.text as an escaped JSON string literal.
        if len(text) >= 2 and text[0] == '"' and text[-1] == '"':
            try:
                decoded = json.loads(text)
                if isinstance(decoded, str):
                    text = decoded
            except json.JSONDecodeError:
                self.errors.append("Could not decode an escaped text wrapper")

        return text

    def extract_from_data(self, har_data: dict[str, Any]) -> list[Any]:
        """Parse and store objects from log.entries[*].response.content.text."""
        self.objects = []
        self.errors = []

        entries = har_data.get("log", {}).get("entries", [])
        if not isinstance(entries, list):
            self.errors.append("Expected log.entries to be a list")
            return self.objects

        for index, entry in enumerate(entries):
            text_value = (
                entry.get("response", {})
                .get("content", {})
                .get("text")
                if isinstance(entry, dict)
                else None
            )
            text = self._normalize_text(text_value)
            if not text or not text.startswith(START_MARKER):
                continue

            end_idx = text.find(END_MARKER, len(START_MARKER))
            if end_idx == -1:
                self.errors.append(f"Entry {index}: missing end marker")
                continue

            payload = text[len(START_MARKER) : end_idx]
            if not payload:
                self.errors.append(f"Entry {index}: payload between markers is empty")
                continue

            try:
                self.objects.append(json.loads(payload))
            except json.JSONDecodeError as ex:
                self.errors.append(f"Entry {index}: invalid payload JSON ({ex.msg})")

        return self.objects

    def extract_from_file(self, input_path: str | Path) -> list[Any]:
        """Load HAR JSON from a file path and extract payload objects."""
        path = Path(input_path)
        with path.open("r", encoding="utf-8") as f:
            har_data = json.load(f)
        return self.extract_from_data(har_data)

    def get_objects(self) -> list[Any]:
        """Return the latest parsed objects."""
        return self.objects


def extract_wf_objects(har_data: dict[str, Any]) -> list[Any]:
    """Backward-compatible functional API."""
    return WellsFargoPayloadExtractor().extract_from_data(har_data)