from decouple import config
from chalicelib.utils import helper

from chalicelib.utils import s3
import hashlib
from urllib.parse import urlparse

from chalicelib.core import sourcemaps_parser


def __get_key(project_id, url):
    u = urlparse(url)
    new_url = u.scheme + "://" + u.netloc + u.path
    return f"{project_id}/{hashlib.md5(new_url.encode()).hexdigest()}"


def presign_share_urls(project_id, urls):
    results = []
    for u in urls:
        results.append(s3.get_presigned_url_for_sharing(bucket=config('sourcemaps_bucket'), expires_in=120,
                                                        key=__get_key(project_id, u),
                                                        check_exists=True))
    return results


def presign_upload_urls(project_id, urls):
    results = []
    for u in urls:
        results.append(s3.get_presigned_url_for_upload(bucket=config('sourcemaps_bucket'),
                                                       expires_in=1800,
                                                       key=__get_key(project_id, u)))
    return results


def __format_frame_old(f):
    if f.get("context") is None:
        f["context"] = []
    else:
        f["context"] = [[f["line"], f["context"]]]
    url = f.pop("url")
    f["absPath"] = url
    f["filename"] = urlparse(url).path
    f["lineNo"] = f.pop("line")
    f["colNo"] = f.pop("column")
    f["function"] = f.pop("func")
    return f


def __frame_is_valid(f):
    return "columnNumber" in f and \
           "lineNumber" in f and \
           "fileName" in f


def __format_frame(f):
    f["context"] = []  # no context by default
    if "source" in f: f.pop("source")
    url = f.pop("fileName")
    f["absPath"] = url
    f["filename"] = urlparse(url).path
    f["lineNo"] = f.pop("lineNumber")
    f["colNo"] = f.pop("columnNumber")
    f["function"] = f.pop("functionName") if "functionName" in f else None
    return f


def format_payload(p, truncate_to_first=False):
    if type(p) is list:
        return [__format_frame(f) for f in (p[:1] if truncate_to_first else p) if __frame_is_valid(f)]
    if type(p) is dict:
        stack = p.get("stack", [])
        return [__format_frame_old(f) for f in (stack[:1] if truncate_to_first else stack)]
    return []


def get_traces_group(project_id, payload):
    frames = format_payload(payload)

    results = [{}] * len(frames)
    payloads = {}
    all_exists = True
    for i, u in enumerate(frames):
        print("===============================")
        print(u["absPath"])
        print("converted to:")
        key = __get_key(project_id, u["absPath"])  # use filename instead?
        print(key)
        print("===============================")
        if key not in payloads:
            file_exists = s3.exists(config('sourcemaps_bucket'), key)
            all_exists = all_exists and file_exists
            if not file_exists:
                print(f"{u['absPath']} sourcemap (key '{key}') doesn't exist in S3")
                payloads[key] = None
            else:
                payloads[key] = []
        results[i] = dict(u)
        results[i]["frame"] = dict(u)
        if payloads[key] is not None:
            payloads[key].append({"resultIndex": i,
                                  "position": {"line": u["lineNo"], "column": u["colNo"]},
                                  "frame": dict(u)})
    for key in payloads.keys():
        if payloads[key] is None:
            continue
        key_results = sourcemaps_parser.get_original_trace(key=key, positions=[o["position"] for o in payloads[key]])
        for i, r in enumerate(key_results):
            res_index = payloads[key][i]["resultIndex"]
            # function name search  by frontend lib is better than sourcemaps' one in most cases
            if results[res_index].get("function") is not None:
                r["function"] = results[res_index]["function"]
            r["frame"] = payloads[key][i]["frame"]
            results[res_index] = r
    return fetch_missed_contexts(results), all_exists


def get_js_cache_path(fullURL):
    p = urlparse(fullURL)
    return p.scheme + '/' + p.netloc + p.path  # TODO (Also in go assets library): What if URL with query? (like versions)


MAX_COLUMN_OFFSET = 60


def fetch_missed_contexts(frames):
    source_cache = {}
    for i in range(len(frames)):
        if len(frames[i]["context"]) != 0:
            continue
        if frames[i]["frame"]["absPath"] in source_cache:
            file = source_cache[frames[i]["frame"]["absPath"]]
        else:
            file = s3.get_file(config('js_cache_bucket'), get_js_cache_path(frames[i]["frame"]["absPath"]))
            if file is None:
                print(
                    f"File {get_js_cache_path(frames[i]['frame']['absPath'])} not found in {config('js_cache_bucket')}")
            source_cache[frames[i]["frame"]["absPath"]] = file
        if file is None:
            continue
        lines = file.split("\n")

        if frames[i]["lineNo"] is None:
            print("no original-source found for frame in sourcemap results")
            frames[i] = frames[i]["frame"]
            frames[i]["originalMapping"] = False

        l = frames[i]["lineNo"] - 1  # starts from 1
        c = frames[i]["colNo"] - 1  # starts from 1
        if len(lines) == 1:
            print(f"minified asset")
            l = frames[i]["frame"]["lineNo"] - 1  # starts from 1
            c = frames[i]["frame"]["colNo"] - 1  # starts from 1
        elif l >= len(lines):
            print(f"line number {l} greater than file length {len(lines)}")
            continue

        line = lines[l]
        offset = c - MAX_COLUMN_OFFSET
        if offset < 0:  # if the line is shirt
            offset = 0
        frames[i]["context"].append([frames[i]["lineNo"], line[offset: c + MAX_COLUMN_OFFSET + 1]])
    return frames