"""APIClient - Agent — Code snippet generators."""
import json
from urllib.parse import urlencode

from app.models import HttpRequest


def _qs(req: HttpRequest) -> str:
    if not req.params:
        return req.url
    sep = "&" if "?" in req.url else "?"
    return req.url + sep + urlencode(req.params)


def to_curl(req: HttpRequest) -> str:
    parts = [f"curl -X {req.method}"]
    parts.append(f'  "{_qs(req)}"')
    for k, v in req.headers.items():
        parts.append(f"  -H '{k}: {v}'")
    if req.body:
        escaped = req.body.replace("'", r"'\''")
        parts.append(f"  -d '{escaped}'")
    if not req.ssl_verify:
        parts.append("  --insecure")
    return " \\\n".join(parts)


def to_python_requests(req: HttpRequest) -> str:
    headers = dict(req.headers)
    if req.body and "Content-Type" not in headers:
        headers["Content-Type"] = "application/json"

    lines = ["import requests", ""]
    lines.append(f'url = "{req.url}"')
    if headers:
        lines.append(f"headers = {json.dumps(headers, indent=4)}")
    if req.params:
        lines.append(f"params = {json.dumps(req.params, indent=4)}")
    lines.append("")

    call_args = ["url"]
    if headers:
        call_args.append("headers=headers")
    if req.params:
        call_args.append("params=params")
    if req.body:
        lines.append(f"payload = {json.dumps(req.body)}")
        call_args.append("data=payload")
    if not req.ssl_verify:
        call_args.append("verify=False")

    lines.append(f"response = requests.{req.method.lower()}({', '.join(call_args)})")
    lines.append("")
    lines.append("print(response.status_code)")
    lines.append("print(response.json())")
    return "\n".join(lines)


def to_python_httpx(req: HttpRequest) -> str:
    headers = dict(req.headers)
    lines   = ["import httpx", ""]
    lines.append(f'url = "{req.url}"')
    if headers:
        lines.append(f"headers = {json.dumps(headers, indent=4)}")
    if req.params:
        lines.append(f"params = {json.dumps(req.params, indent=4)}")
    lines.append("")

    call_args = ["url"]
    if headers:
        call_args.append("headers=headers")
    if req.params:
        call_args.append("params=params")
    if req.body:
        lines.append(f"payload = {json.dumps(req.body)}")
        call_args.append("content=payload.encode()")
    if not req.ssl_verify:
        call_args.append("verify=False")

    lines.append("with httpx.Client() as client:")
    lines.append(f"    response = client.{req.method.lower()}({', '.join(call_args)})")
    lines.append("    print(response.status_code)")
    lines.append("    print(response.json())")
    return "\n".join(lines)


def to_javascript_fetch(req: HttpRequest) -> str:
    options: dict = {"method": req.method}
    if req.headers:
        options["headers"] = req.headers
    if req.body:
        options["body"] = req.body

    lines = [
        f'const response = await fetch("{_qs(req)}", {json.dumps(options, indent=2)});',
        "",
        "const data = await response.json();",
        "console.log(response.status, data);",
    ]
    return "\n".join(lines)


def to_javascript_axios(req: HttpRequest) -> str:
    config: dict = {}
    if req.headers:
        config["headers"] = req.headers
    if req.params:
        config["params"] = req.params
    if req.body:
        config["data"] = req.body

    lines = ["const axios = require('axios');", ""]
    if config:
        lines.append(f"const config = {json.dumps(config, indent=2)};")
        lines.append("")
        lines.append(f'const response = await axios.{req.method.lower()}("{req.url}", config);')
    else:
        lines.append(f'const response = await axios.{req.method.lower()}("{req.url}");')
    lines.append("console.log(response.status, response.data);")
    return "\n".join(lines)


def to_ruby(req: HttpRequest) -> str:
    lines = [
        "require 'net/http'",
        "require 'uri'",
        "require 'json'",
        "",
        f'uri = URI.parse("{_qs(req)}")',
        f"http = Net::HTTP.new(uri.host, uri.port)",
        "http.use_ssl = uri.scheme == 'https'",
    ]
    if not req.ssl_verify:
        lines.append("http.verify_mode = OpenSSL::SSL::VERIFY_NONE")
    lines.append("")
    klass_map = {
        "GET": "Net::HTTP::Get", "POST": "Net::HTTP::Post",
        "PUT": "Net::HTTP::Put", "PATCH": "Net::HTTP::Patch",
        "DELETE": "Net::HTTP::Delete", "HEAD": "Net::HTTP::Head",
    }
    klass = klass_map.get(req.method, "Net::HTTP::Get")
    lines.append(f"request = {klass}.new(uri.request_uri)")
    for k, v in req.headers.items():
        lines.append(f'request["{k}"] = "{v}"')
    if req.body:
        lines.append(f"request.body = {json.dumps(req.body)}")
    lines += [
        "",
        "response = http.request(request)",
        "puts response.code",
        "puts response.body",
    ]
    return "\n".join(lines)


GENERATORS = {
    "curl":                  to_curl,
    "Python (requests)":     to_python_requests,
    "Python (httpx)":        to_python_httpx,
    "JavaScript (fetch)":    to_javascript_fetch,
    "JavaScript (axios)":    to_javascript_axios,
    "Ruby (Net::HTTP)":      to_ruby,
}