package commands

import (
	"bytes"
	"encoding/json"
	"fmt"

	"git.hangman-lab.top/zhi/HarborForge.Cli/internal/client"
	"git.hangman-lab.top/zhi/HarborForge.Cli/internal/config"
	"git.hangman-lab.top/zhi/HarborForge.Cli/internal/output"
)

// supportResponse matches the backend SupportResponse schema.
type supportResponse struct {
	ID          int     `json:"id"`
	Code        string  `json:"code"`
	Title       string  `json:"title"`
	Description *string `json:"description"`
	Status      string  `json:"status"`
	Priority    string  `json:"priority"`
	ProjectCode *string `json:"project_code"`
	TakenBy     *string `json:"taken_by"`
	CreatedAt   string  `json:"created_at"`
}

// RunSupportList implements `hf support list`.
func RunSupportList(args []string, tokenFlag string) {
	token := ResolveToken(tokenFlag)

	query := ""
	for i := 0; i < len(args); i++ {
		switch args[i] {
		case "--taken-by":
			if i+1 >= len(args) {
				output.Error("--taken-by requires a value")
			}
			i++
			query = appendQuery(query, "taken_by", args[i])
		case "--status":
			if i+1 >= len(args) {
				output.Error("--status requires a value")
			}
			i++
			query = appendQuery(query, "status", args[i])
		case "--order-by":
			if i+1 >= len(args) {
				output.Error("--order-by requires a value")
			}
			i++
			query = appendQuery(query, "order_by", args[i])
		default:
			output.Errorf("unknown flag: %s", args[i])
		}
	}

	cfg, err := config.Load()
	if err != nil {
		output.Errorf("config error: %v", err)
	}
	c := client.New(cfg.BaseURL, token)
	path := "/supports"
	if query != "" {
		path += "?" + query
	}
	data, err := c.Get(path)
	if err != nil {
		output.Errorf("failed to list support tickets: %v", err)
	}

	if output.JSONMode {
		var raw json.RawMessage
		if err := json.Unmarshal(data, &raw); err != nil {
			output.Errorf("invalid JSON response: %v", err)
		}
		output.PrintJSON(raw)
		return
	}

	var tickets []supportResponse
	if err := json.Unmarshal(data, &tickets); err != nil {
		output.Errorf("cannot parse support list: %v", err)
	}

	headers := []string{"CODE", "TITLE", "STATUS", "PRIORITY", "TAKEN BY"}
	var rows [][]string
	for _, s := range tickets {
		takenBy := ""
		if s.TakenBy != nil {
			takenBy = *s.TakenBy
		}
		title := s.Title
		if len(title) > 40 {
			title = title[:37] + "..."
		}
		rows = append(rows, []string{s.Code, title, s.Status, s.Priority, takenBy})
	}
	output.PrintTable(headers, rows)
}

// RunSupportGet implements `hf support get <support-code>`.
func RunSupportGet(supportCode, tokenFlag string) {
	token := ResolveToken(tokenFlag)
	cfg, err := config.Load()
	if err != nil {
		output.Errorf("config error: %v", err)
	}
	c := client.New(cfg.BaseURL, token)
	data, err := c.Get("/supports/" + supportCode)
	if err != nil {
		output.Errorf("failed to get support ticket: %v", err)
	}

	if output.JSONMode {
		var raw json.RawMessage
		if err := json.Unmarshal(data, &raw); err != nil {
			output.Errorf("invalid JSON response: %v", err)
		}
		output.PrintJSON(raw)
		return
	}

	var s supportResponse
	if err := json.Unmarshal(data, &s); err != nil {
		output.Errorf("cannot parse support ticket: %v", err)
	}

	desc := ""
	if s.Description != nil {
		desc = *s.Description
	}
	project := ""
	if s.ProjectCode != nil {
		project = *s.ProjectCode
	}
	takenBy := ""
	if s.TakenBy != nil {
		takenBy = *s.TakenBy
	}
	output.PrintKeyValue(
		"code", s.Code,
		"title", s.Title,
		"description", desc,
		"status", s.Status,
		"priority", s.Priority,
		"project", project,
		"taken-by", takenBy,
		"created", s.CreatedAt,
	)
}

// RunSupportCreate implements `hf support create`.
func RunSupportCreate(args []string, tokenFlag string) {
	token := ResolveToken(tokenFlag)

	title, project, desc, priority := "", "", "", ""
	for i := 0; i < len(args); i++ {
		switch args[i] {
		case "--title":
			if i+1 >= len(args) {
				output.Error("--title requires a value")
			}
			i++
			title = args[i]
		case "--project":
			if i+1 >= len(args) {
				output.Error("--project requires a value")
			}
			i++
			project = args[i]
		case "--desc":
			if i+1 >= len(args) {
				output.Error("--desc requires a value")
			}
			i++
			desc = args[i]
		case "--priority":
			if i+1 >= len(args) {
				output.Error("--priority requires a value")
			}
			i++
			priority = args[i]
		default:
			output.Errorf("unknown flag: %s", args[i])
		}
	}

	if title == "" {
		output.Error("usage: hf support create --title <title>")
	}

	payload := map[string]interface{}{
		"title": title,
	}
	if project != "" {
		payload["project_code"] = project
	}
	if desc != "" {
		payload["description"] = desc
	}
	if priority != "" {
		payload["priority"] = priority
	}

	body, err := json.Marshal(payload)
	if err != nil {
		output.Errorf("cannot marshal payload: %v", err)
	}

	cfg, err := config.Load()
	if err != nil {
		output.Errorf("config error: %v", err)
	}
	c := client.New(cfg.BaseURL, token)
	data, err := c.Post("/supports", bytes.NewReader(body))
	if err != nil {
		output.Errorf("failed to create support ticket: %v", err)
	}

	if output.JSONMode {
		var raw json.RawMessage
		if err := json.Unmarshal(data, &raw); err != nil {
			output.Errorf("invalid JSON response: %v", err)
		}
		output.PrintJSON(raw)
		return
	}

	var s supportResponse
	if err := json.Unmarshal(data, &s); err != nil {
		fmt.Printf("support ticket created: %s\n", title)
		return
	}
	fmt.Printf("support ticket created: %s (code: %s)\n", s.Title, s.Code)
}

// RunSupportUpdate implements `hf support update <support-code>`.
func RunSupportUpdate(supportCode string, args []string, tokenFlag string) {
	token := ResolveToken(tokenFlag)

	payload := make(map[string]interface{})
	for i := 0; i < len(args); i++ {
		switch args[i] {
		case "--title":
			if i+1 >= len(args) {
				output.Error("--title requires a value")
			}
			i++
			payload["title"] = args[i]
		case "--desc":
			if i+1 >= len(args) {
				output.Error("--desc requires a value")
			}
			i++
			payload["description"] = args[i]
		case "--status":
			if i+1 >= len(args) {
				output.Error("--status requires a value")
			}
			i++
			payload["status"] = args[i]
		case "--priority":
			if i+1 >= len(args) {
				output.Error("--priority requires a value")
			}
			i++
			payload["priority"] = args[i]
		default:
			output.Errorf("unknown flag: %s", args[i])
		}
	}

	if len(payload) == 0 {
		output.Error("nothing to update — provide at least one flag")
	}

	body, err := json.Marshal(payload)
	if err != nil {
		output.Errorf("cannot marshal payload: %v", err)
	}

	cfg, err := config.Load()
	if err != nil {
		output.Errorf("config error: %v", err)
	}
	c := client.New(cfg.BaseURL, token)
	_, err = c.Patch("/supports/"+supportCode, bytes.NewReader(body))
	if err != nil {
		output.Errorf("failed to update support ticket: %v", err)
	}

	fmt.Printf("support ticket updated: %s\n", supportCode)
}

// RunSupportTake implements `hf support take <support-code>`.
func RunSupportTake(supportCode, tokenFlag string) {
	token := ResolveToken(tokenFlag)

	cfg, err := config.Load()
	if err != nil {
		output.Errorf("config error: %v", err)
	}
	c := client.New(cfg.BaseURL, token)
	_, err = c.Post("/supports/"+supportCode+"/take", nil)
	if err != nil {
		output.Errorf("failed to take support ticket: %v", err)
	}

	fmt.Printf("support ticket taken: %s\n", supportCode)
}

// RunSupportTransition implements `hf support transition <support-code> <status>`.
func RunSupportTransition(supportCode, status, tokenFlag string) {
	token := ResolveToken(tokenFlag)

	payload := map[string]interface{}{
		"status": status,
	}
	body, err := json.Marshal(payload)
	if err != nil {
		output.Errorf("cannot marshal payload: %v", err)
	}

	cfg, err := config.Load()
	if err != nil {
		output.Errorf("config error: %v", err)
	}
	c := client.New(cfg.BaseURL, token)
	_, err = c.Post("/supports/"+supportCode+"/transition", bytes.NewReader(body))
	if err != nil {
		output.Errorf("failed to transition support ticket: %v", err)
	}

	fmt.Printf("support ticket %s transitioned to %s\n", supportCode, status)
}

// RunSupportDelete implements `hf support delete <support-code>`.
func RunSupportDelete(supportCode, tokenFlag string) {
	token := ResolveToken(tokenFlag)
	cfg, err := config.Load()
	if err != nil {
		output.Errorf("config error: %v", err)
	}
	c := client.New(cfg.BaseURL, token)
	_, err = c.Delete("/supports/" + supportCode)
	if err != nil {
		output.Errorf("failed to delete support ticket: %v", err)
	}
	fmt.Printf("support ticket deleted: %s\n", supportCode)
}