package handlers

import (
	"encoding/json"
	"net/http"
	"os"
)

var ledgerBaseURL = getEnv("LEDGER_URL", "http://localhost:3250")

func getEnv(key, fallback string) string {
	if v := os.Getenv(key); v != "" {
		return v
	}
	return fallback
}

// LedgerClient handles communication with aamos-ledger
type LedgerClient struct {
	BaseURL string
}

func NewLedgerClient() *LedgerClient {
	return &LedgerClient{BaseURL: ledgerBaseURL}
}

func (c *LedgerClient) Get(path string) (*http.Response, error) {
	return http.Get(c.BaseURL + path)
}

// LedgerFinanceHandler connects to aamos-ledger for financial data
type LedgerFinanceHandler struct {
	Client *LedgerClient
}

func NewLedgerFinanceHandler() *LedgerFinanceHandler {
	return &LedgerFinanceHandler{Client: NewLedgerClient()}
}

func (h *LedgerFinanceHandler) GetBalanceSheet(w http.ResponseWriter, r *http.Request) {
	resp, err := h.Client.Get("/api/ledger/reports/balance")
	if err != nil {
		writeError(w, http.StatusServiceUnavailable, "ledger unavailable")
		return
	}
	defer resp.Body.Close()

	if resp.StatusCode != 200 {
		writeError(w, resp.StatusCode, "ledger error")
		return
	}

	var result map[string]interface{}
	if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
		writeError(w, http.StatusInternalServerError, "decode error")
		return
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(result)
}

func (h *LedgerFinanceHandler) GetIncomeStatement(w http.ResponseWriter, r *http.Request) {
	resp, err := h.Client.Get("/api/ledger/reports/income")
	if err != nil {
		writeError(w, http.StatusServiceUnavailable, "ledger unavailable")
		return
	}
	defer resp.Body.Close()

	if resp.StatusCode != 200 {
		writeError(w, resp.StatusCode, "ledger error")
		return
	}

	var result map[string]interface{}
	if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
		writeError(w, http.StatusInternalServerError, "decode error")
		return
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(result)
}

func (h *LedgerFinanceHandler) GetMomsReport(w http.ResponseWriter, r *http.Request) {
	resp, err := h.Client.Get("/api/ledger/tax/moms")
	if err != nil {
		writeError(w, http.StatusServiceUnavailable, "ledger unavailable")
		return
	}
	defer resp.Body.Close()

	if resp.StatusCode != 200 {
		writeError(w, resp.StatusCode, "ledger error")
		return
	}

	var result map[string]interface{}
	if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
		writeError(w, http.StatusInternalServerError, "decode error")
		return
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(result)
}

func (h *LedgerFinanceHandler) GetAccounts(w http.ResponseWriter, r *http.Request) {
	resp, err := h.Client.Get("/api/ledger/accounts")
	if err != nil {
		writeError(w, http.StatusServiceUnavailable, "ledger unavailable")
		return
	}
	defer resp.Body.Close()

	if resp.StatusCode != 200 {
		writeError(w, resp.StatusCode, "ledger error")
		return
	}

	var result map[string]interface{}
	if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
		writeError(w, http.StatusInternalServerError, "decode error")
		return
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(result)
}

func (h *LedgerFinanceHandler) GetCustomers(w http.ResponseWriter, r *http.Request) {
	resp, err := h.Client.Get("/api/ledger/customers")
	if err != nil {
		writeError(w, http.StatusServiceUnavailable, "ledger unavailable")
		return
	}
	defer resp.Body.Close()

	if resp.StatusCode != 200 {
		writeError(w, resp.StatusCode, "ledger error")
		return
	}

	var result map[string]interface{}
	if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
		writeError(w, http.StatusInternalServerError, "decode error")
		return
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(result)
}

func (h *LedgerFinanceHandler) GetInvoices(w http.ResponseWriter, r *http.Request) {
	resp, err := h.Client.Get("/api/ledger/invoices")
	if err != nil {
		writeError(w, http.StatusServiceUnavailable, "ledger unavailable")
		return
	}
	defer resp.Body.Close()

	if resp.StatusCode != 200 {
		writeError(w, resp.StatusCode, "ledger error")
		return
	}

	var result map[string]interface{}
	if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
		writeError(w, http.StatusInternalServerError, "decode error")
		return
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(result)
}