package main

import (
	"encoding/json"
	"errors"
	"fmt"
	"log"
	"regexp"
	"strconv"
	"sync"
)

var (
	muxObjItem        sync.RWMutex
	objItems          []ChatWarsItem
	cacheObjItem      map[string]int64
	cacheObjItemId    map[int64]int64
	cacheObjItemCraft map[string]int64
)

func addObjItem(code string, name string, itemTypeID64 int64, weight int64, exchange string, auction bool, craftable bool) (int64, error) {
	tx, err := db.Begin()
	logOnError(err, "addObjItem : start transaction")
	if err != nil {
		return 0, err
	}

	res, err := tx.Exec(`INSERT INTO obj (obj_type_id, obj_sub_type_id)
						          VALUES (` + strconv.FormatInt(cacheObjType[`item`], 10) + `,` + fmt.Sprintf("%d", itemTypeID64) + `);`)
	logOnError(err, "addObjItem : exec insert obj ("+code+", "+name+")")
	if err != nil {
		err2 := tx.Rollback()
		logOnError(err2, "addObjItem : rollback insert obj")
		return 0, err
	}

	objId, err := res.LastInsertId()
	if err != nil {
		err2 := tx.Rollback()
		logOnError(err2, "addObjItem : rollback get lastInsertId")
		return 0, err
	}

	stmt, err := tx.Prepare(`INSERT INTO obj_item	(obj_id, intl_id, weight, exchange, auction, craftable)
							 VALUES 				(?,      ?,       ?,      ?,        ?,       ?);`)
	logOnError(err, "addObjItem : prepare insert obj_item")
	if err != nil {
		err2 := tx.Rollback()
		logOnError(err2, "addObjItem : rollback prepare insert obj_item")
		return 0, err
	}
	defer stmt.Close()

	var e, a, c int = 0, 0, 0
	if exchange != `` {
		e = 1
	}
	if auction {
		a = 1
	}
	if craftable {
		c = 1
	}

	_, err = stmt.Exec(objId, code, weight, e, a, c)
	logOnError(err, "addObjItem : exec insert obj_item")
	if err != nil {
		err2 := tx.Rollback()
		logOnError(err2, "addObjItem : rollback exec insert obj_item")
		return 0, err
	}

	err = tx.Commit()
	logOnError(err, "addObjItem : commit")
	if err != nil {
		return 0, err
	}

	err = objAddName(objId, name)
	logOnError(err, "addObjItem : add name")

	return objId, nil
}

func getObjItem(objID64 int64) (*ChatWarsItem, error) {
	muxObjItem.RLock()
	defer muxObjItem.RUnlock()
	if id, ok := cacheObjItemId[objID64]; ok {
		//log.Printf("Matching item name %s with %s.\n", name, obj.Name)
		return &objItems[id], nil
	} else {
		return nil, errors.New("Item not found.")
	}
}

func getObjItemID(c string, n string) int64 {
	return getVerboseObjItemID(c, n)
}

func getVerboseObjItemID(c string, n string) int64 {
	i := getSilentObjItemID(c, n)
	if i == 0 {
		w := TGCommand{
			Type:       commandSendMsg,
			Text:       fmt.Sprintf("Object unknown : %s - %s\n", c, n),
			ToUserID64: cfg.Bot.Admin,
		}
		TGCmdQueue <- w
	}
	return i
}

func getSilentObjItemID(code string, name string) int64 {
	muxObjItem.RLock()
	defer muxObjItem.RUnlock()
	if len(code) > 0 {
		if id, ok := cacheObjItem[code]; ok {
			//log.Printf("Matching item code %s with %s.\n", code, obj.Code)
			return objItems[id].ObjID64
		}
		if ok, _ := regexp.MatchString(`^(a|w)[0-9]+[a-e]$`, code); ok {
			//			log.Printf("Matching quality item code %s with %s.\n", code, code[:len(code)-1])
			if id, ok := cacheObjItem[code[:len(code)-1]]; ok {
				return objItems[id].ObjID64
			}
		}
		if ok, _ := regexp.MatchString(`^u[0-9]+`, code); !ok {
			return 0
		}
	}
	if len(name) == 0 {
		return 0
	}
	if id, ok := cacheObjItem[name]; ok {
		//log.Printf("Matching item name %s with %s.\n", name, obj.Name)
		return objItems[id].ObjID64
	}
	if ok, _ := regexp.MatchString(`^((u|e)[0-9]+|(a|w)[0-9]+[a-e]{0,1})$`, code); ok || len(code) == 0 {
		r := regexp.MustCompile(`^((?P<Modifier>⚡\+[0-9]+) ){0,1}(?P<BaseName>.+?)( \+(?P<Atk>[0-9]+)⚔){0,1}( \+(?P<Def>[0-9]+)🛡){0,1}( \+(?P<Mana>[0-9]+)💧){0,1}$`)
		basename := r.ReplaceAllString(name, "${BaseName}")
		if id, ok := cacheObjItem[basename]; ok && len(basename) > 0 {
			//log.Printf("Matching item full basename %s with %s.\n", basename, obj.Name)
			return objItems[id].ObjID64
		}
		i := int64(-1)
		for _, id := range cacheObjItem {
			if ok, _ := regexp.MatchString(`^(a|e|w)[0-9]+$`, objItems[id].Code); ok { //only gear can be custom named
				m := fmt.Sprintf("^((%s.*)|(.*%s))$", regexp.QuoteMeta(objItems[id].Names[0]), regexp.QuoteMeta(objItems[id].Names[0]))
				if ok, _ := regexp.MatchString(m, basename); ok {
					//log.Printf("LOOP : Matching item modified basename %s with %s (%d).\n", basename, item.Name, item.ObjID64)
					i = id
					break
				}
			}
		}

		if i != -1 {
			//log.Printf("RETURN : Matching item modified basename %s with %s (%d).\n", basename, item.Name, item.ObjID64)
			return objItems[i].ObjID64
		} else {
			/*
				fmt.Printf("silentGetObjItemID : Modifier : `%s`\n", r.ReplaceAllString(name, "${Modifier}"))
				fmt.Printf("silentGetObjItemID : BaseName : `%s`\n", r.ReplaceAllString(name, "${BaseName}"))
				fmt.Printf("silentGetObjItemID : Atk : `%s`\n", r.ReplaceAllString(name, "${Atk}"))
				fmt.Printf("silentGetObjItemID : Def : `%s`\n", r.ReplaceAllString(name, "${Def}"))
				fmt.Printf("silentGetObjItemID : Mana : `%s`\n", r.ReplaceAllString(name, "${Mana}"))
			*/
		}

	}
	return 0

}

func setObjItemCraftable(objID64 int64, craftable bool) error {
	var c int = 0
	if craftable {
		c = 1
	}

	stmt, err := db.Prepare(`UPDATE obj_item oi SET oi.craftable = ? WHERE oi.obj_id = ?;`)
	logOnError(err, "setObjItemCraftable : prepare update obj_item")
	if err != nil {
		return err
	}
	defer stmt.Close()

	_, err = stmt.Exec(c, objID64)
	logOnError(err, fmt.Sprintf("setObjItemCraftable : update obj_item(%d)", objID64))
	if err != nil {
		return err
	}
	return nil
}

func setObjItemWeight(objID64 int64, weight int64) error {
	stmt, err := db.Prepare(`UPDATE obj_item oi SET oi.weight = ? WHERE oi.obj_id = ?;`)
	logOnError(err, "setObjItemWeight : prepare update obj_item")
	if err != nil {
		return err
	}
	defer stmt.Close()

	_, err = stmt.Exec(weight, objID64)
	logOnError(err, fmt.Sprintf("setObjItemWeight : update obj_item(%d)", objID64))
	if err != nil {
		return err
	}
	return nil
}

func setObjItemCraft(objID64 int64, cmd string, mana int64) error {
	stmt, err := db.Prepare(`INSERT INTO obj_craft (obj_id, cmd, mana)
	                         VALUES                (?,      ?,   ?)
	                         ON DUPLICATE KEY UPDATE cmd = ?, mana = ?;`)

	logOnError(err, "setObjItemCraft : prepare update obj_craft")
	if err != nil {
		return err
	}
	defer stmt.Close()

	_, err = stmt.Exec(objID64, cmd, mana, cmd, mana)
	logOnError(err, fmt.Sprintf("setObjItemCraft : update obj_craft(%d)", objID64))
	if err != nil {
		return err
	}
	return nil
}

func emptyObjItemCraftItem(objID64 int64) error {
	stmt, err := db.Prepare(`DELETE FROM obj_craft_item WHERE obj_id = ?;`)
	logOnError(err, "emptyObjItemCraftItem : prepare delete obj_craft_item")
	if err != nil {
		return err
	}
	defer stmt.Close()

	_, err = stmt.Exec(objID64)
	logOnError(err, fmt.Sprintf("setObjItemWeight : delete obj_craft_item(%d)", objID64))
	if err != nil {
		return err
	}
	return nil
}

func addObjItemCraftItem(objID64 int64, itemID64 int64, quantity int64) error {
	stmt, err := db.Prepare(`INSERT INTO obj_craft_item (obj_id, item_id, quantity)
	                         VALUES                     (?,      ?,       ?);`)

	logOnError(err, "addObjItemCraftItem : prepare update obj_craft_item")
	if err != nil {
		return err
	}
	defer stmt.Close()

	_, err = stmt.Exec(objID64, itemID64, quantity)
	logOnError(err, fmt.Sprintf("addObjItemCraftItem : update obj_craft_item(%d)", objID64))
	if err != nil {
		return err
	}
	return nil
}

func getCraftItemID(cmd string) (int64, error) {
	muxObjItem.RLock()
	defer muxObjItem.RUnlock()

	if id, ok := cacheObjItemCraft[cmd]; ok {
		return objItems[id].ObjID64, nil
	} else {
		return 0, nil
	}

	return 0, nil
}

func loadObjItem() error {
	var (
		obj_id    int64
		type_id   int64
		intl_id   string
		name      string
		weight    int64
		craftable int
	)

	muxObjItem.Lock()
	defer muxObjItem.Unlock()
	cacheObjItem = make(map[string]int64)
	cacheObjItemId = make(map[int64]int64)
	cacheObjItemCraft = make(map[string]int64)
	objItems = make([]ChatWarsItem, 0)

	b, err := Asset("data/obj_item.json")
	logOnError(err, "loadObjItem : load data/obj_item.json")
	if err != nil {
		return err
	}

	err = json.Unmarshal(b, &objItems)
	var k int64
	for k = 0; k < int64(len(objItems)); k++ {
		if len(objItems[k].Names) == 0 {
			log.Printf("loadObjItems : %s : name missing.\n", objItems[k].Code)
		} else {
			if id, ok := cacheObjItem[objItems[k].Code]; ok {
				log.Printf("loadObjItem : %s : duplicate code found. Belong to %s\n", objItems[id].Code, objItems[id].Names[0])
			} else {
				cacheObjItem[objItems[k].Code] = k
				objItems[k].ItemTypeID = cacheObjSubType[objItems[k].ItemType]

				for _, n := range objItems[k].Names {
					if id, ok := cacheObjItem[n]; ok {
						log.Printf("loadObjItem : %s - %s : duplicate name found. Belongs to %s\n", objItems[k].Code, n, objItems[id].Code)
					} else {
						cacheObjItem[n] = k
					}
				}
			}
		}
	}

	objs, err := db.Query(`SELECT oi.obj_id, o.obj_sub_type_id, oi.intl_id, oi.weight, oi.craftable FROM obj o, obj_item oi WHERE o.id = oi.obj_id;`)
	if err != nil {
		logOnError(err, "loadObjItem : querying items")
		return err
	}
	defer objs.Close()

	for objs.Next() {
		err = objs.Scan(&obj_id, &type_id, &intl_id, &weight, &craftable)
		if err != nil {
			logOnError(err, "loadObjItem : scanning items")
			return err
		}

		if id, ok := cacheObjItem[intl_id]; !ok {
			log.Printf("loadObjItem : %s : orphaned item in database (id : %d)\n", intl_id, obj_id)
		} else {
			objItems[id].ObjID64 = obj_id

			if weight != objItems[id].Weight {
				log.Printf("loadObjItem : %s - %s : weight changed : %d => %d\n", objItems[id].Code, objItems[id].Names[0], weight, objItems[id].Weight)
				setObjItemWeight(obj_id, objItems[id].Weight)
			}

			if (craftable == 0 && objItems[id].Craftable) || (craftable == 1 && !objItems[id].Craftable) {
				log.Printf("loadObjItem : %s - %s : craftable changed : %v => %v\n", objItems[id].Code, objItems[id].Names[0], !objItems[id].Craftable, objItems[id].Craftable)
				setObjItemCraftable(obj_id, objItems[id].Craftable)
			}

			cacheObjItemId[obj_id] = id
		}
	}

	names, err := db.Query(`SELECT oi.obj_id, obn.name FROM obj_item oi, obj_name obn WHERE oi.obj_id = obn.obj_id;`)
	if err != nil {
		logOnError(err, "loadObjItem : querying names")
		return err
	}
	defer names.Close()

	for names.Next() {
		err = names.Scan(&obj_id, &name)
		if err != nil {
			logOnError(err, "loadObjItem : scanning names")
			return err
		}
		if _, ok := cacheObjItem[name]; !ok {
			if id, ok := cacheObjItemId[obj_id]; ok {
				log.Printf("loadObjItem : %s : orphaned name in database for item %s\n", name, objItems[id].Code)
			}
		}
	}

	for _, i := range cacheObjItem {
		if objItems[i].ObjID64 == 0 {
			id, _ := addObjItem(objItems[i].Code, objItems[i].Names[0], objItems[i].ItemTypeID, objItems[i].Weight, objItems[i].Exchange, objItems[i].Auction, objItems[i].Craftable)
			objItems[i].ObjID64 = id
			cacheObjItemId[id] = i
			for _, n := range objItems[i].Names {
				objAddName(id, n)
				cacheObjItem[n] = id
			}
		}
	}

	for _, i := range cacheObjItem {
		if objItems[i].Craft != nil {
			cacheObjItemCraft[objItems[i].Craft.Command] = i
			setObjItemCraft(objItems[i].ObjID64, objItems[i].Craft.Command, objItems[i].Craft.Mana)
			emptyObjItemCraftItem(objItems[i].ObjID64)
			for k, o := range objItems[i].Craft.Items {
				if id, ok := cacheObjItem[o.Code]; !ok {
					log.Printf("loadObjItem : %s : unknown item %s for recipe.\n", objItems[i].Code, o.Code)
				} else {
					objItems[i].Craft.Items[k].ItemID64 = objItems[id].ObjID64
				}

			}
			for _, o := range objItems[i].Craft.Items {
				addObjItemCraftItem(objItems[i].ObjID64, o.ItemID64, o.Quantity)
			}
		}
	}

	log.Printf("%d items loaded.\n", len(objItems))

	/*
		for _, v := range cacheObjItemId {
			log.Printf("Item cached : %d\n", v.ObjID64)
			for _, n := range v.Names {
				log.Printf("cacheObjItemId[%d] : %s : %s.\n", v.ObjID64, v.Names[0], n)
			}
		}
	*/

	return nil

}