package service

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

type AWXClient struct {
	baseURL string
	token   string
	client  *http.Client
}

type AWXLaunchRequest struct {
	InventoryID uint64
	Limit       string
	ExtraVars   map[string]any
}

type AWXJob struct {
	ID     uint64 `json:"id"`
	Status string `json:"status"`
	Failed bool   `json:"failed"`
}

func NewAWXClient(baseURL, token string) *AWXClient {
	return &AWXClient{
		baseURL: strings.TrimRight(baseURL, "/"),
		token:   strings.TrimSpace(token),
		client:  &http.Client{Timeout: 30 * time.Second},
	}
}

func (c *AWXClient) Configured() bool {
	return c.baseURL != "" && c.token != ""
}

func (c *AWXClient) Launch(ctx context.Context, templateID uint64, input AWXLaunchRequest) (*AWXJob, error) {
	body := map[string]any{"inventory": input.InventoryID, "extra_vars": input.ExtraVars}
	if input.Limit != "" {
		body["limit"] = input.Limit
	}
	var job AWXJob
	if err := c.request(ctx, http.MethodPost, fmt.Sprintf("/api/v2/job_templates/%d/launch/", templateID), body, &job); err != nil {
		return nil, err
	}
	if job.ID == 0 {
		return nil, fmt.Errorf("AWX launch response did not include a job id")
	}
	return &job, nil
}

func (c *AWXClient) GetJob(ctx context.Context, jobID string) (*AWXJob, error) {
	if _, err := strconv.ParseUint(jobID, 10, 64); err != nil {
		return nil, fmt.Errorf("invalid AWX job id %q", jobID)
	}
	var job AWXJob
	if err := c.request(ctx, http.MethodGet, "/api/v2/jobs/"+jobID+"/", nil, &job); err != nil {
		return nil, err
	}
	return &job, nil
}

func (c *AWXClient) Cancel(ctx context.Context, jobID string) error {
	if _, err := strconv.ParseUint(jobID, 10, 64); err != nil {
		return fmt.Errorf("invalid AWX job id %q", jobID)
	}
	return c.request(ctx, http.MethodPost, "/api/v2/jobs/"+jobID+"/cancel/", map[string]any{}, nil)
}

func (c *AWXClient) request(ctx context.Context, method, path string, payload any, output any) error {
	if !c.Configured() {
		return fmt.Errorf("AWX_BASE_URL and AWX_TOKEN must be configured")
	}
	var body io.Reader
	if payload != nil {
		raw, err := json.Marshal(payload)
		if err != nil {
			return err
		}
		body = bytes.NewReader(raw)
	}
	req, err := http.NewRequestWithContext(ctx, method, c.baseURL+path, body)
	if err != nil {
		return err
	}
	req.Header.Set("Authorization", "Bearer "+c.token)
	req.Header.Set("Accept", "application/json")
	if payload != nil {
		req.Header.Set("Content-Type", "application/json")
	}
	resp, err := c.client.Do(req)
	if err != nil {
		return fmt.Errorf("AWX request: %w", err)
	}
	defer resp.Body.Close()
	raw, err := io.ReadAll(io.LimitReader(resp.Body, 1<<20))
	if err != nil {
		return err
	}
	if resp.StatusCode < 200 || resp.StatusCode >= 300 {
		return fmt.Errorf("AWX returned %s: %s", resp.Status, strings.TrimSpace(string(raw)))
	}
	if output != nil && len(raw) > 0 {
		if err := json.Unmarshal(raw, output); err != nil {
			return fmt.Errorf("decode AWX response: %w", err)
		}
	}
	return nil
}