package model

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

// --- Redmine Project API structs ---
type Project struct {
	ID   int    `json:"id"`
	Name string `json:"name"`
}

type ProjectResponse struct {
	Project Project `json:"project"`
}

type ProjectsResponse struct {
	Projects []Project `json:"projects"`
	TotalCount int     `json:"total_count"`
	Offset     int     `json:"offset"`
	Limit      int     `json:"limit"`
}

// Fetch a single project's details
func FetchProject(baseURL, apiKey, projectID string) (*Project, error) {
	client := &http.Client{}
	url := fmt.Sprintf("%s/projects/%s.json", baseURL, projectID)

	req, err := http.NewRequest("GET", url, nil)
	if err != nil {
		return nil, err
	}
	req.Header.Set("X-Redmine-API-Key", apiKey)

	resp, err := client.Do(req)
	if err != nil {
		return nil, fmt.Errorf("HTTP request failed: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		body, _ := io.ReadAll(resp.Body)
		return nil, fmt.Errorf("API error %d: %s", resp.StatusCode, string(body))
	}

	var result ProjectResponse
	if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
		return nil, fmt.Errorf("JSON decode error: %w", err)
	}

	return &result.Project, nil
}

// Fetch all projects with pagination
func FetchAllProjects(baseURL, apiKey string) ([]Project, error) {
	var all []Project
	limit := 100
	offset := 0

	client := &http.Client{}

	for {
		url := fmt.Sprintf("%s/projects.json?limit=%d&offset=%d",
			baseURL, limit, offset)

		req, err := http.NewRequest("GET", url, nil)
		if err != nil {
			return nil, err
		}
		req.Header.Set("X-Redmine-API-Key", apiKey)

		resp, err := client.Do(req)
		if err != nil {
			return nil, fmt.Errorf("HTTP request failed: %w", err)
		}
		defer resp.Body.Close()

		if resp.StatusCode != http.StatusOK {
			body, _ := io.ReadAll(resp.Body)
			return nil, fmt.Errorf("API error %d: %s", resp.StatusCode, string(body))
		}

		var result ProjectsResponse
		if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
			return nil, fmt.Errorf("JSON decode error: %w", err)
		}

		all = append(all, result.Projects...)

		if offset+limit >= result.TotalCount {
			break
		}
		offset += limit
	}

	return all, nil
}