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/**
 * CQL Minus - cqlminus
 *
 * This file is licensed under the Affero General Public License version 3 or
 * later. See the COPYING file.
 *
 * @author Paolo Lulli <kevwe.com>
 * @copyright Paolo Lulli 2026
 */

package main

import (
    "cqlminus/internal/config"
    "cqlminus/internal/db"
    "cqlminus/internal/render"
    "flag"
    "fmt"
    "io"
    "os"
    "path/filepath"
    "strings"

    "github.com/chzyer/readline"
    "github.com/gocql/gocql"
)

func main() {
    configPath := flag.String("config", os.Getenv("HOME")+"/.config/cqlminus/config.json", "config file")
    historyPath := flag.String("history", defaultHistoryPath(), "history file")
    flag.Parse()

    cfg, err := config.LoadConfig(*configPath)
    if err != nil {
        fmt.Fprintf(os.Stderr, "error: %v\n", err)
        os.Exit(1)
    }

    session, err := db.Connect(cfg)
    if err != nil {
        fmt.Fprintf(os.Stderr, "error: %v\n", err)
        os.Exit(1)
    }
    defer session.Close()

    fmt.Printf("connected to %s keyspace=%s\n", cfg.Endpoint, cfg.Keyspace)
    fmt.Println("enter CQL queries, terminate with ; then enter. type exit or quit to leave.")
    fmt.Println("use up/down arrows to browse command history.")

    runLoop(session, *historyPath)
}

func defaultHistoryPath() string {
    home, err := os.UserHomeDir()
    if err != nil {
        return ".cqlminus_history"
    }
    return filepath.Join(home, ".cqlminus_history")
}

func runLoop(session *gocql.Session, historyPath string) {
    rl, err := readline.NewEx(&readline.Config{
        Prompt:                 "cqlminus> ",
        HistoryFile:            historyPath,
        HistoryLimit:           1000,
        DisableAutoSaveHistory: true,
    })
    if err != nil {
        render.PrintError(fmt.Errorf("initializing readline: %w", err))
        return
    }
    defer rl.Close()

    var buffer strings.Builder

    for {
        if buffer.Len() == 0 {
            rl.SetPrompt("cqlminus> ")
        } else {
            rl.SetPrompt("...> ")
        }

        line, err := rl.Readline()
        if err == readline.ErrInterrupt {
            buffer.Reset()
            continue
        }
        if err == io.EOF {
            return
        }
        if err != nil {
            return
        }

        trimmed := strings.TrimSpace(line)

        if buffer.Len() == 0 {
            lower := strings.ToLower(trimmed)
            if lower == "exit" || lower == "quit" {
                return
            }
            if trimmed == "" {
                continue
            }
        }

        buffer.WriteString(line)
        buffer.WriteString(" ")

        if !strings.HasSuffix(trimmed, ";") {
            continue
        }

        query := strings.TrimSpace(buffer.String())
        query = strings.TrimSuffix(query, ";")
        buffer.Reset()

        if query == "" {
            continue
        }

        rl.SaveHistory(query)

        result, err := db.RunQuery(session, query)
        if err != nil {
            render.PrintError(err)
            continue
        }

        render.PrintTable(result)
    }
}