"""Code exporter for HTTP entries (Python, JavaScript, Go)."""

import json

from http_log_explorer.models import HTTPEntry


class CodeExporter:
    """Export HTTP entries as code snippets in various languages."""

    def __init__(self) -> None:
        """Initialize code exporter."""
        self._template_dir = ""

    PYTHON_TEMPLATE = '''import requests

headers = {headers}
{data}
response = requests.{method}(
    "{url}"{params}
{headers_param})
{body}
print(response.status_code)
print(response.json())
'''

    JAVASCRIPT_TEMPLATE = '''const axios = require('axios');

const config = {{
    method: '{method}',
    url: '{url}',
{headers_js}
{data_js}
{body_js}
}};

axios(config)
    .then(response => {{
        console.log(response.status);
        console.log(response.data);
    }})
    .catch(error => {{
        console.error(error);
    }});
'''

    GO_TEMPLATE = '''package main

import (
    "bytes"
    "encoding/json"
    "fmt"
    "net/http"
)

func main() {{
{headers_go}
{data_go}
    body{data_var} := {body_val}
{body_prep}
    req, err := http.NewRequest("{method}", "{url}", {body_ref})
    if err != nil {{
        panic(err)
    }}
{set_headers}
    client := &http.Client{{}}
    resp, err := client.Do(req)
    if err != nil {{
        panic(err)
    }}
    defer resp.Body.Close()

    fmt.Println("Status:", resp.Status)
}}

'''

    def export_python(self, entry: HTTPEntry) -> str:
        """Export entry as Python code.

        Args:
            entry: HTTPEntry object

        Returns:
            Python code string
        """
        headers_str = self._format_python_dict(entry.request.headers)

        data_line = ""
        body_line = ""
        params_line = ""

        if entry.request.query_params:
            params_line = f", params={self._format_python_dict(entry.request.query_params)}"

        if entry.request.body:
            body_line = "data=data,"

        if entry.request.headers:
            headers_param = "\n    headers=headers"
        else:
            headers_param = ""

        method_lower = entry.request.method.lower()

        return self.PYTHON_TEMPLATE.format(
            method=method_lower,
            url=entry.request.url,
            headers=headers_str,
            params=params_line,
            headers_param=headers_param,
            data=data_line,
            body=body_line,
        )

    def export_javascript(self, entry: HTTPEntry) -> str:
        """Export entry as JavaScript code.

        Args:
            entry: HTTPEntry object

        Returns:
            JavaScript code string
        """
        headers_lines = []
        for name, value in entry.request.headers.items():
            headers_lines.append(f'    "{name}": "{value}",')

        headers_js = "\n".join(headers_lines)
        if headers_js:
            headers_js = "headers: {\n" + headers_js + "\n},"

        data_js = ""
        data_val = "{}"
        body_js = ""

        if entry.request.body:
            data_val = json.dumps(entry.request.body)
            data_js = f"const data = {data_val};"
            body_js = "data: data,"

        if entry.request.query_params:
            data_val = json.dumps(entry.request.query_params)
            data_js = f"const params = {data_val};"
            body_js = "params: params,"

        return self.JAVASCRIPT_TEMPLATE.format(
            method=entry.request.method.lower(),
            url=entry.request.url,
            headers_js=headers_js,
            data_js=data_js,
            body_js=body_js,
        )

    def export_go(self, entry: HTTPEntry) -> str:
        """Export entry as Go code.

        Args:
            entry: HTTPEntry object

        Returns:
            Go code string
        """
        headers_lines = []
        for name, value in entry.request.headers.items():
            headers_lines.append(f'    req.Header.Set("{name}", "{value}")')

        headers_go = "\n".join(headers_lines)

        data_val = "nil"
        data_var = ""
        body_prep = ""
        body_ref = "nil"
        data_go = ""

        if entry.request.body:
            escaped = self._escape_go_string(entry.request.body)
            data_val = f"`{escaped}`"
            body_prep = f'    body := bytes.NewBufferString({data_val})'
            body_ref = "body"

        set_headers = headers_go if headers_go else "    // No headers"

        return self.GO_TEMPLATE.format(
            method=entry.request.method,
            url=entry.request.url,
            headers_go=headers_go,
            data_go=data_go,
            data_var=data_var,
            body_val=data_val,
            body_prep=body_prep,
            body_ref=body_ref,
            set_headers=set_headers,
        )

    def export_batch(
        self, entries: list[HTTPEntry], language: str
    ) -> list[str]:
        """Export multiple entries as code snippets.

        Args:
            entries: List of HTTPEntry objects
            language: Target language (python, javascript, go)

        Returns:
            List of code strings

        Raises:
            ValueError: If language is not supported
        """
        language = language.lower()
        if language == "python":
            return [self.export_python(e) for e in entries]
        elif language == "javascript":
            return [self.export_javascript(e) for e in entries]
        elif language == "go":
            return [self.export_go(e) for e in entries]
        else:
            raise ValueError(
                f"Unsupported language: {language}. "
                f"Supported: python, javascript, go"
            )

    def _format_python_dict(self, d: dict[str, str]) -> str:
        """Format dictionary as Python code.

        Args:
            d: Dictionary to format

        Returns:
            Python dict string
        """
        if not d:
            return "{}"
        items = [f'"{k}": "{v}"' for k, v in d.items()]
        return "{\n    " + ",\n    ".join(items) + "\n}"

    def _escape_go_string(self, s: str) -> str:
        """Escape string for Go.

        Args:
            s: String to escape

        Returns:
            Escaped string
        """
        return s.replace("\\", "\\\\").replace("`", "\\`").replace("$", "\\$")

    def to_file(
        self, entries: list[HTTPEntry], path: str, language: str
    ) -> None:
        """Write code snippets to file.

        Args:
            entries: List of HTTPEntry objects
            path: Output file path
            language: Target language
        """
        snippets = self.export_batch(entries, language)
        with open(path, "w") as f:
            for snippet in snippets:
                f.write(snippet)
                f.write("\n\n")