package router

import (
    "github.com/gin-gonic/gin"
    "github.com/leafee98/paste-abroad/internel/storage"

    "log"
    "strings"
    "time"
    "strconv"
    "bytes"
)


var store storage.Storage
var defaultExpireTime int64

func Init(e *gin.Engine, s storage.Storage, expireTime int64) {
    defaultExpireTime = expireTime
    store = s

    e.POST("/", PostPaste)
    e.GET("/raw/:id", GetPasteRaw)
    e.GET("/:id", GetPaste)
}

// PostPaste require two parameters from either URL or form-data
// URL parameters are preferred.
//   c          is paste content in bytes
//   life       is expire time in days
//   encrypt    default false, means this paste is in plain
func PostPaste(ctx *gin.Context) {
    var content []byte

    switch strings.ToLower(ctx.ContentType()) {
    case "multipart/form-data":
        content_file, err := ctx.FormFile("c")
        if err == nil {
            c_reader, _ := content_file.Open()
            content_buffer := new(bytes.Buffer)
            content_buffer.ReadFrom(c_reader)
            content = content_buffer.Bytes()
        } else {
            content_str, exists := getRequestValue(ctx, "c", false)
            if !exists {
                ctx.String(400, "cannot get paste content: missing parameter \"c\"")
                return
            }
            content = []byte(content_str)
        }
    case "application/x-www-form-urlencoded":
        content_str, exists := getRequestValue(ctx, "c", false)
        if !exists {
            ctx.String(400, "cannot get paste content: missing parameter \"c\"")
            return
        }
        content = []byte(content_str)
    default:
        ctx.String(400, "unrecognized content type: %s", ctx.ContentType())
        return
    }

    life := requestValue(ctx, "life", true)
    encrypt := requestValue(ctx, "encrypt", true)

    life_int, err := strconv.ParseInt(life, 10, 64)
    if err != nil {
        life_int = defaultExpireTime
    }

    paste := storage.Paste{
        Content: content,
        // Content: content_buffer.Bytes(),
        Encrypt: isEncrypt(encrypt),
        Expire: life_int * 1000 * 3600 * 24 + time.Now().UnixMilli(),
    }

    id, err := store.Save(&paste)
    if err != nil {
        ctx.String(500, "Internel error")
        log.Printf("Failed to save paste: %v", err)
        return
    }

    log.Printf("Saved a paste { id: %s, encrypt: %t, expire: %d}", id, paste.Encrypt, paste.Expire)

    ctx.String(200, id)
}

func GetPasteRaw(ctx * gin.Context) {
    id := ctx.Param("id")

    content, err := store.Get(id)
    if err != nil {
        ctx.String(500, "Internel error")
        log.Printf("Failed to get paste: %v", err)
        return
    }

    if content == nil {
        ctx.String(404, "Paste not found")
        return
    }

    if content.Encrypt {
        ctx.Data(200, "application/octet-stream", content.Content)
    } else {
        ctx.Data(200, "text/plain", content.Content)
    }
}

func GetPaste(ctx * gin.Context) {
}

func requestValue(ctx *gin.Context, key string, urlPrefer bool) string {
    var value string

    if urlPrefer {
        value = ctx.Query(key)
        if value == "" {
            value = ctx.PostForm(key)
        }
    } else {
        value = ctx.PostForm(key)
        if value == "" {
            value = ctx.Query(key)
        }
    }

    return value
}

func getRequestValue(ctx *gin.Context, key string, urlPrefer bool) (string, bool) {
    var value string
    var exists bool

    if urlPrefer {
        value, exists = ctx.GetQuery(key)
        if !exists {
            value, exists = ctx.GetPostForm(key)
        }
    } else {
        value, exists = ctx.GetPostForm(key)
        if !exists {
            value, exists = ctx.GetQuery(key)
        }
    }

    return value, exists
}

func isEncrypt(s string) bool {
    ture_values := []string{ "t", "true", "y", "yes", "1" }

    s = strings.ToLower(s)
    for i := range ture_values {
        if s == ture_values[i] {
            return true
        }
    }

    return false
}