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/**
 * RemoteBrain - rbrain
 *
 * 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 (
    "bufio"
    "database/sql"
    "errors"
    "fmt"
    "os"
    "rbrain/internal/config"
    "rbrain/internal/encoding"
    "rbrain/internal/queries"
    "rbrain/internal/service"
    "rbrain/internal/tlsclient"
    "strings"
    "time"
)

func main() {
    configPath := os.Getenv("HOME") + "/.config/rbrain/config.json"

    if _, err := os.Stat(configPath); errors.Is(err, os.ErrNotExist) {
        fmt.Printf("Config file %s doesn't exist\n", configPath)
        os.Exit(1)
    }

    cfg := config.GetClientConfig(configPath)
    var c = tlsclient.RBrain{Config: cfg}

    model := cfg.Model
    if len(os.Args) > 1 {
        model = os.Args[1]
    }

    db, err := sql.Open("sqlite", cfg.DbFile)
    if err != nil {
        fmt.Fprintf(os.Stderr, "Cannot open database: %v\n", err)
        os.Exit(1)
    }
    defer db.Close()

    if err := queries.InitSchema(db); err != nil {
        fmt.Fprintf(os.Stderr, "Cannot initialise schema: %v\n", err)
        os.Exit(1)
    }

    fmt.Printf("\nRemote Brain\n")
    fmt.Printf("  model    : %s\n", model)
    fmt.Printf("  database : %s\n", cfg.DbFile)
    fmt.Printf("%s\n\n", strings.Repeat("─", 64))

    scanner := bufio.NewScanner(os.Stdin)
    ch := make(chan service.Result, 1)

    for {
        fmt.Print("[Request]: ")
        if !scanner.Scan() {
            break
        }

        input := strings.TrimSpace(scanner.Text())
        if input == "" {
            continue
        }

        switch {
        case input == ":quit" || input == ":exit" || input == ":q":
            fmt.Println("Exiting")
            return

        case input == ":history":
            printHistory(db)
            continue

        case strings.HasPrefix(input, ":model "):
            model = strings.TrimPrefix(input, ":model ")
            fmt.Printf("Model switched to: %s\n\n", model)
            continue
        }
        fmt.Print("    [Bot]: Processing...")
        c.ProcessMessage(db, input, model, ch)

        res := <-ch
        fmt.Print("\r    [Bot]: ")
        if res.Err != nil {
            fmt.Printf("Error: %v\n\n", res.Err)
        } else {
            fmt.Printf("%s\n\n", strings.TrimSpace(res.Text))
        }
    }

    if err := scanner.Err(); err != nil {
        fmt.Fprintf(os.Stderr, "Scanner: %v\n", err)
    }
}

func printHistory(db *sql.DB) {
    rows, err := queries.GetRequestsHistory(db)
    if err != nil {
        fmt.Printf("History error: %v\n", err)
        return
    }

    fmt.Printf("\n%s\n", strings.Repeat("─", 64))
    fmt.Println("Last conversations (oldest first)")
    fmt.Printf("%s\n", strings.Repeat("─", 64))
    defer rows.Close()

    for rows.Next() {
        var message, response, createdAt string
        if err := rows.Scan(&message, &response, &createdAt); err != nil {
            fmt.Printf("History error: %v\n", err)
            return
        }

        if t, err := time.Parse("2006-01-02 15:04:05", createdAt); err == nil {
            createdAt = t.Format("Jan 02 2006  15:04:05")
        }
        fmt.Printf("\ntime: %s\n", createdAt)
        fmt.Printf("query: %s\n", encoding.DecodeB64(message))
        fmt.Printf("response %s\n", encoding.DecodeB64(response))
    }
    fmt.Printf("%s\n", strings.Repeat("─", 64))
}