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// Package api is a thin, standalone HTTP client for the rickub JSON API
// (`/api/v1`), hand-written against the API's published OpenAPI description. It
// imports none of the server's packages: the CLI is a pure client with a clean
// dependency boundary.
package api

import (
	"bytes"
	"context"
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"net/url"
	"strconv"
	"strings"
	"time"
)

// Client talks to a rickub API host with a bearer PAT.
type Client struct {
	Host       string // e.g. https://rickub.com (no trailing slash)
	Token      string // rickub_pat_…
	HTTPClient *http.Client
	// UserAgent is sent on every request.
	UserAgent string
}

// New builds a Client with a sane default HTTP client.
func New(host, token string) *Client {
	return &Client{
		Host:       strings.TrimRight(host, "/"),
		Token:      token,
		HTTPClient: &http.Client{Timeout: 30 * time.Second},
		UserAgent:  "rickub-cli",
	}
}

// APIError is the parsed `{error:{code,message}}` envelope plus HTTP status.
type APIError struct {
	Status  int
	Code    string
	Message string
}

func (e *APIError) Error() string {
	if e.Code != "" {
		return fmt.Sprintf("%s (%s)", e.Message, e.Code)
	}
	if e.Message != "" {
		return e.Message
	}
	return fmt.Sprintf("HTTP %d", e.Status)
}

type errorEnvelope struct {
	Error struct {
		Code    string `json:"code"`
		Message string `json:"message"`
	} `json:"error"`
}

// Request is a low-level typed request description.
type Request struct {
	Method string
	// Path is the API path WITHOUT the /api/v1 prefix, e.g. "/repos/o/r".
	// Each segment must already be escaped by the caller where needed.
	Path  string
	Query url.Values
	// Body, if non-nil, is JSON-encoded.
	Body any
	// Accept overrides the Accept header (default application/json).
	Accept string
}

// raw performs the request and returns status, body bytes, and content-type.
// A non-2xx response is decoded into an *APIError.
func (c *Client) raw(ctx context.Context, r Request) (int, []byte, string, error) {
	u := c.Host + "/api/v1" + r.Path
	if len(r.Query) > 0 {
		u += "?" + r.Query.Encode()
	}

	var body io.Reader
	if r.Body != nil {
		b, err := json.Marshal(r.Body)
		if err != nil {
			return 0, nil, "", err
		}
		body = bytes.NewReader(b)
	}

	req, err := http.NewRequestWithContext(ctx, r.Method, u, body)
	if err != nil {
		return 0, nil, "", err
	}
	if c.Token != "" {
		req.Header.Set("Authorization", "Bearer "+c.Token)
	}
	accept := r.Accept
	if accept == "" {
		accept = "application/json"
	}
	req.Header.Set("Accept", accept)
	if r.Body != nil {
		req.Header.Set("Content-Type", "application/json")
	}
	req.Header.Set("User-Agent", c.UserAgent)

	resp, err := c.HTTPClient.Do(req)
	if err != nil {
		return 0, nil, "", err
	}
	defer resp.Body.Close()

	data, err := io.ReadAll(resp.Body)
	if err != nil {
		return resp.StatusCode, nil, resp.Header.Get("Content-Type"), err
	}

	if resp.StatusCode >= 200 && resp.StatusCode < 300 {
		return resp.StatusCode, data, resp.Header.Get("Content-Type"), nil
	}

	// Attempt to decode the standard error envelope.
	apiErr := &APIError{Status: resp.StatusCode}
	var env errorEnvelope
	if json.Unmarshal(data, &env) == nil && env.Error.Code != "" {
		apiErr.Code = env.Error.Code
		apiErr.Message = env.Error.Message
	} else {
		apiErr.Message = strings.TrimSpace(string(data))
		if apiErr.Message == "" {
			apiErr.Message = http.StatusText(resp.StatusCode)
		}
	}
	return resp.StatusCode, data, resp.Header.Get("Content-Type"), apiErr
}

// do performs the request and unmarshals a JSON success body into out (which
// may be nil for empty 204 responses).
func (c *Client) do(ctx context.Context, r Request, out any) error {
	_, data, _, err := c.raw(ctx, r)
	if err != nil {
		return err
	}
	if out == nil || len(bytes.TrimSpace(data)) == 0 {
		return nil
	}
	return json.Unmarshal(data, out)
}

// RawJSON performs a request and returns the raw (success) response body. Used
// by the `rickub api` escape hatch and `--json` passthrough.
func (c *Client) RawJSON(ctx context.Context, method, path string, query url.Values, body any) ([]byte, string, error) {
	_, data, ct, err := c.raw(ctx, Request{Method: method, Path: path, Query: query, Body: body})
	return data, ct, err
}

// RawText performs a GET requesting text/plain and returns the decoded body.
func (c *Client) RawText(ctx context.Context, path string, query url.Values) ([]byte, error) {
	_, data, _, err := c.raw(ctx, Request{Method: http.MethodGet, Path: path, Query: query, Accept: "text/plain"})
	return data, err
}

// itoa is a small helper for building integer path segments.
func itoa(n int) string { return strconv.Itoa(n) }

// pageQuery builds a ?page/?per_page query, omitting zero values.
func pageQuery(page, perPage int, extra url.Values) url.Values {
	q := url.Values{}
	for k, v := range extra {
		q[k] = v
	}
	if page > 0 {
		q.Set("page", strconv.Itoa(page))
	}
	if perPage > 0 {
		q.Set("per_page", strconv.Itoa(perPage))
	}
	return q
}