#!/usr/bin/env python3
"""
CoordConverter — Mercator Suite Entry Point
Reads PARAM_* env vars set by agc, runs conversion, outputs SUITE_OUTPUT JSON.
"""
import os
import sys
import json
import traceback

# Ensure suite dir is on path
sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))

from converter.workflow import ConversionWorkflow


def get_param(name: str, default: str | None = None) -> str:
    val = os.environ.get(f"PARAM_{name}")
    if val:
        return val.strip()
    if default is not None:
        return default
    raise ValueError(f"缺少必填参数: {name}")


def parse_epsg(raw: str) -> str | None:
    """Normalize EPSG string. '4326' → 'EPSG:4326'. 'auto' / '' → None."""
    raw = raw.strip()
    if not raw or raw.lower() in ("auto", "none", ""):
        return None
    if raw.upper().startswith("EPSG:"):
        return raw.upper()
    return f"EPSG:{raw}"


def main():
    input_file = get_param("INPUT_FILE")
    output_file = get_param("OUTPUT_FILE")
    from_crs_raw = get_param("FROM_CRS", "auto")
    to_crs_raw = get_param("TO_CRS", "EPSG:4490")
    output_format = get_param("OUTPUT_FORMAT", "auto")

    # Validate input
    if not os.path.isfile(input_file):
        raise FileNotFoundError(f"输入文件不存在: {input_file}")

    from_crs = parse_epsg(from_crs_raw)
    to_crs = parse_epsg(to_crs_raw)

    # Ensure output dir exists
    out_dir = os.path.dirname(output_file)
    if out_dir:
        os.makedirs(out_dir, exist_ok=True)

    wf = ConversionWorkflow()
    result = wf.run(
        input_path=input_file,
        output_path=output_file,
        from_crs=from_crs,
        to_crs=to_crs,
        output_format=output_format,
    )

    # Mercator standard output
    print("=== SUITE_OUTPUT ===")
    print(json.dumps(result, ensure_ascii=False, indent=2))
    print("=== END_SUITE_OUTPUT ===")


if __name__ == "__main__":
    try:
        main()
    except Exception as e:
        print(json.dumps({
            "success": False,
            "error": str(e),
            "traceback": traceback.format_exc(),
        }, ensure_ascii=False))
        sys.exit(1)